summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/lib/texmfmp.c
blob: 0f19d83b9ddf1362a4e329432bab3eee4a9b8865 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
/* texmfmp.c: Hand-coded routines for TeX or Metafont in C.  Originally
   written by Tim Morgan, drawing from other Unix ports of TeX.  This is
   a collection of miscellany, everything that's easier (or only
   possible) to do in C.
   
   This file is public domain.  */

/* This file is included from, e.g., texextra,c after
      #define EXTERN
      #include <texd.h>
   to instantiate data from texd.h here.  The ?d.h file is what
   #defines TeX or MF, which avoids the need for a special
   Makefile rule.  */

#include <kpathsea/c-ctype.h>
#include <kpathsea/line.h>
#include <kpathsea/readable.h>
#include <kpathsea/variable.h>
#include <kpathsea/absolute.h>
#ifdef WIN32
#include <kpathsea/concatn.h>
#endif

#include <time.h> /* For `struct tm'.  */
#if defined (HAVE_SYS_TIME_H)
#include <sys/time.h>
#elif defined (HAVE_SYS_TIMEB_H)
#include <sys/timeb.h>
#endif

#if defined(__STDC__)
#include <locale.h>
#endif

#include <signal.h> /* Catch interrupts.  */

#include <texmfmp-help.h>

/* {tex,mf}d.h defines TeX, MF, INI, and other such symbols.
   Unfortunately there's no way to get the banner into this code, so
   just repeat the text.  */
#ifdef TeX
#if defined(XeTeX)
#include <xetexdir/xetexextra.h>
#elif defined (eTeX)
#include <etexdir/etexextra.h>
#elif defined (pdfTeX)
#include <pdftexdir/pdftexextra.h>
#include <pdftexdir/ptexlib.h>
#elif defined (Aleph)
#include <alephdir/alephextra.h>
#elif defined (pTeX)
#include <ptexdir/ptexextra.h>
#elif defined (epTeX)
#include <eptexdir/eptexextra.h>
#elif defined (upTeX)
#include <uptexdir/uptexextra.h>
#elif defined (eupTeX)
#include <euptexdir/euptexextra.h>
#else
#define BANNER "This is TeX, Version 3.1415926"
#define COPYRIGHT_HOLDER "D.E. Knuth"
#define AUTHOR NULL
#define PROGRAM_HELP TEXHELP
#define BUG_ADDRESS "tex-k@tug.org"
#define DUMP_VAR TEXformatdefault
#define DUMP_LENGTH_VAR formatdefaultlength
#define DUMP_OPTION "fmt"
#define DUMP_EXT ".fmt"
#define INPUT_FORMAT kpse_tex_format
#define INI_PROGRAM "initex"
#define VIR_PROGRAM "virtex"
#endif
#define edit_var "TEXEDIT"
#endif /* TeX */
#ifdef MF
#define BANNER "This is Metafont, Version 2.718281"
#define COPYRIGHT_HOLDER "D.E. Knuth"
#define AUTHOR NULL
#define PROGRAM_HELP MFHELP
#define BUG_ADDRESS "tex-k@tug.org"
#define DUMP_VAR MFbasedefault
#define DUMP_LENGTH_VAR basedefaultlength
#define DUMP_OPTION "base"
#ifdef DOS
#define DUMP_EXT ".bas"
#else
#define DUMP_EXT ".base"
#endif
#define INPUT_FORMAT kpse_mf_format
#define INI_PROGRAM "inimf"
#define VIR_PROGRAM "virmf"
#define edit_var "MFEDIT"
#endif /* MF */

#define IS_eTeX (defined(eTeX) || defined(epTeX) || defined(eupTeX)) || defined(pdfTeX) || defined(Aleph) || defined(XeTeX)
#define IS_pTeX (defined(pTeX) || defined(epTeX) || defined(upTeX) || defined(eupTeX))
#define IS_upTeX (defined(upTeX) || defined(eupTeX))

#if defined(__SyncTeX__)
/* 
   SyncTeX file name should be full path in the case where
   --output-directory option is given.
   Borrowed from LuaTeX.
*/
char *generic_synctex_get_current_name (void)
{
  char *pwdbuf, *ret;
  if (kpse_absolute_p(fullnameoffile, false)) {
     return xstrdup(fullnameoffile);
  }
  pwdbuf = xgetcwd();
  ret = concat3(pwdbuf, DIR_SEP_STRING, fullnameoffile);
  free(pwdbuf) ;
  return ret;
}
#endif

/* Shell escape.

   If shellenabledp == 0, all shell escapes are forbidden.
   If (shellenabledp == 1 && restrictedshell == 0), any command
     is allowed for a shell escape.
   If (shellenabledp == 1 && restrictedshell == 1), only commands
     given in the configuration file as
   shell_escape_commands = kpsewhich,ebb,extractbb,mpost,metafun,...
     (no spaces between commands) in texmf.cnf are allowed for a shell
     escape in a restricted form: command name and arguments should be
     separated by a white space. The first word should be a command
     name. The quotation character for an argument with spaces,
     including a pathname, should be ".  ' should not be used.

     Internally, all arguments are quoted by ' (Unix) or " (Windows)
     before calling the system() function in order to forbid execution
     of any embedded command.  In addition, on Windows, special
     characters of cmd.exe are escaped by using (^).

   If the --shell-escape option is given, we set
     shellenabledp = 1 and restrictedshell = 0, i.e., any command is allowed.
   If the --shell-restricted option is given, we set
     shellenabledp = 1 and restrictedshell = 1, i.e., only given cmds allowed.
   If the --no-shell-escape option is given, we set
     shellenabledp = -1 (and restrictedshell is irrelevant).
   If none of these option are given, there are three cases:
   (1) In the case where
       shell_escape = y or
       shell_escape = t or
       shell_escape = 1
       it becomes shellenabledp = 1 and restrictedshell = 0,
       that is, any command is allowed.
   (2) In the case where
       shell_escape = p
       it becomes shellenabledp = 1 and restrictedshell = 1,
       that is, restricted shell escape is allowed.
   (3) In all other cases, shellenabledp = 0, that is, shell
       escape is forbidden. The value of restrictedshell is
       irrelevant if shellenabledp == 0.
*/

#ifdef TeX

/* cmdlist is a list of allowed commands which are given like this:
   shell_escape_commands = kpsewhich,ebb,extractbb,mpost,metafun
   in texmf.cnf. */

static char **cmdlist = NULL;

void 
mk_shellcmdlist (const char *v)
{
  char **p;
  const char *q, *r1;
  char *r;
  int  n;

  q = v;
  n = 0;

/* analyze the variable shell_escape_commands = foo,bar,...
   spaces before and after (,) are not allowed. */

  while ((r1 = strchr (q, ',')) != 0) {
    n++;
    r1++;
    q = r1;
  }
  if (*q)
    n++;
  cmdlist = xmalloc ((n + 1) * sizeof (char *));
  p = cmdlist;
  q = v;
  while ((r = strchr (q, ',')) != 0) {
    *r = '\0';
    *p = xmalloc (strlen (q) + 1);
    strcpy (*p, q);
    *r = ',';
    r++;
    q = r;
    p++;
  }
  if (*q) {
    *p = xmalloc (strlen (q) + 1);
    strcpy (*p, q);
    p++;
    *p = NULL;
  } else
    *p = NULL;
}

/* Called from maininit.  Not static because also called from
   luatexdir/lua/luainit.c.  */

void
init_shell_escape (void)
{
  if (shellenabledp < 0) {  /* --no-shell-escape on cmd line */
    shellenabledp = 0;

  } else {
    if (shellenabledp == 0) {  /* no shell options on cmd line, check cnf */
      char *v1 = kpse_var_value ("shell_escape");
      if (v1) {
        if (*v1 == 't' || *v1 == 'y' || *v1 == '1') {
          shellenabledp = 1;
        } else if (*v1 == 'p') {
          shellenabledp = 1;
          restrictedshell = 1;
        }
        free (v1);
      }
    }

    /* If shell escapes are restricted, get allowed cmds from cnf.  */   
    if (shellenabledp && restrictedshell == 1) {
      char *v2 = kpse_var_value ("shell_escape_commands");
      if (v2) {
        mk_shellcmdlist ((const char *)v2);
        free (v2);
      }
    }
  }
}

#ifdef WIN32
#define QUOTE '"'
#else
#define QUOTE '\''
#endif

#ifdef WIN32
static int
char_needs_quote (int c)
{
/* special characters of cmd.exe */

  return (c == '&' || c == '|' || c == '%' || c == '<' ||
          c == '>' || c == ';' || c == ',' || c == '(' ||
          c == ')');
}
#endif

static int
Isspace (char c)
{
  return (c == ' ' || c == '\t');
}

#if 0
/* We could call this at the end of the main program, but does it matter?
   The process is about to exit anyway.  */
static void
free_shellcmdlist (void)
{
  char **p;

  if (cmdlist) {
    p = cmdlist;
    while (*p) {
      free (*p);
      p++;
    }
    free (cmdlist);
  }
}
#endif

/* return values:
  -1 : invalid quotation of an argument
   0 : command is not allowed
   2 : restricted shell escape, CMD is allowed.
   
   We set *SAFECMD to a safely-quoted version of *CMD; this is what
   should get executed.  And we set CMDNAME to its first word; this is
   what is checked against the shell_escape_commands list.  */

int
shell_cmd_is_allowed (const char *cmd, char **safecmd, char **cmdname)
{
  char **p;
  char *buf;
  char *c, *d;
  const char *s;
  int  pre, spaces;
  int  allow = 0;

  /* pre == 1 means that the previous character is a white space
     pre == 0 means that the previous character is not a white space */
  buf = xmalloc (strlen (cmd) + 1);
  strcpy (buf, cmd);
  c = buf;
  while (Isspace (*c))
    c++;
  d = c;
  while (!Isspace(*d) && *d)
    d++;
  *d = '\0';

  /* *cmdname is the first word of the command line.  For example,
     *cmdname == "kpsewhich" for
     \write18{kpsewhich --progname=dvipdfm --format="other text files" config}
  */
  *cmdname = xstrdup (c);
  free (buf);

  /* Is *cmdname listed in a texmf.cnf vriable as
     shell_escape_commands = foo,bar,... ? */
  p = cmdlist;
  if (p) {
    while (*p) {
      if (strcmp (*p, *cmdname) == 0) {
      /* *cmdname is found in the list, so restricted shell escape
          is allowed */
        allow = 2;
        break;
      }
      p++;
    }
  }
  if (allow == 2) {
    spaces = 0;
    for (s = cmd; *s; s++) {
      if (Isspace (*s))
        spaces++;
    }

    /* allocate enough memory (too much?) */
#ifdef WIN32
    *safecmd = xmalloc (2 * strlen (cmd) + 3 + 2 * spaces);
#else
    *safecmd = xmalloc (strlen (cmd) + 3 + 2 * spaces);
#endif

    /* make a safe command line *safecmd */
    s = cmd;
    while (Isspace (*s))
      s++;
    d = *safecmd;
    while (!Isspace (*s) && *s)
      *d++ = *s++;

    pre = 1;
    while (*s) {
      /* Quotation given by a user.  " should always be used; we
         transform it below.  If ' is used, simply immediately
         return a quotation error.  */
      if (*s == '\'') {
        return -1;
      }
         
      if (*s == '"') {
        /* All arguments are quoted as 'foo' (Unix) or "foo" (Windows)
           before calling system(). Therefore closing QUOTE is necessary
           if the previous character is not a white space.
           example:
           --format="other text files" becomes
           '--format=''other text files' (Unix)
           "--format=""other text files" (Windows) */

        if (pre == 0)
          *d++ = QUOTE;

        pre = 0;
        /* output the quotation mark for the quoted argument */
        *d++ = QUOTE;
        s++;

        while (*s != '"') {
          /* Illegal use of ', or closing quotation mark is missing */
          if (*s == '\'' || *s == '\0')
            return -1;
#ifdef WIN32
          if (char_needs_quote (*s))
            *d++ = '^';
#endif
          *d++ = *s++;
        }

        /* Closing quotation mark will be output afterwards, so
           we do nothing here */
        s++;

        /* The character after the closing quotation mark
           should be a white space or NULL */
        if (!Isspace (*s) && *s)
          return -1;

      /* Beginning of a usual argument */
      } else if (pre == 1 && !Isspace (*s)) {
        pre = 0;
        *d++ = QUOTE;
#ifdef WIN32
        if (char_needs_quote (*s))
          *d++ = '^';
#endif
        *d++ = *s++;
        /* Ending of a usual argument */

      } else if (pre == 0 && Isspace (*s)) {
        pre = 1;
        /* Closing quotation mark */
        *d++ = QUOTE;
        *d++ = *s++;
      } else {
        /* Copy a character from cmd to *safecmd. */
#ifdef WIN32
        if (char_needs_quote (*s))
          *d++ = '^';
#endif
        *d++ = *s++;
      }
    }
    /* End of the command line */
    if (pre == 0) {
      *d++ = QUOTE;
    }
    *d = '\0';
#ifdef WIN32
    {
      char *p, *q, *r;
      p = *safecmd;
      if (!(IS_DIR_SEP (p[0]) && IS_DIR_SEP (p[1])) &&
          !(p[1] == ':' && IS_DIR_SEP (p[2]))) { 
        p = (char *) kpse_var_value ("SELFAUTOLOC");
        if (p) {
          r = *safecmd;
          while (*r && !Isspace(*r))
            r++;
          if (*r == '\0')
            q = concatn ("\"", p, "/", *safecmd, "\"", NULL);
          else {
            *r = '\0';
            r++;
            while (*r && Isspace(*r))
              r++;
            if (*r)
              q = concatn ("\"", p, "/", *safecmd, "\" ", r, NULL);
            else
              q = concatn ("\"", p, "/", *safecmd, "\"", NULL);
          }
          free (p);
          free (*safecmd);
          *safecmd = q;
        }
      }
    }
#endif
  }

  return allow;
}

/* We should only be called with shellenabledp == 1.
   Return value:
   -1 if a quotation syntax error.
   0 if CMD is not allowed; given shellenabledp==1, this is because
      shell escapes are restricted and CMD is not allowed.
   1 if shell escapes are not restricted, hence any command is allowed.
   2 if shell escapes are restricted and CMD is allowed (possibly after
      quoting).  */
   
int
runsystem (const char *cmd)
{
  int allow = 0;
  char *safecmd = NULL;
  char *cmdname = NULL;

  if (shellenabledp <= 0) {
    return 0;
  }
  
  /* If restrictedshell == 0, any command is allowed. */
  if (restrictedshell == 0)
    allow = 1;
  else
    allow = shell_cmd_is_allowed (cmd, &safecmd, &cmdname);

  if (allow == 1)
    (void) system (cmd);
  else if (allow == 2)
    (void) system (safecmd);

  if (safecmd)
    free (safecmd);
  if (cmdname)
    free (cmdname);

  return allow;
}

#ifdef pdfTeX
/* Like runsystem(), the runpopen() function is called only when
   shellenabledp == 1.   Unlike runsystem(), here we write errors to
   stderr, since we have nowhere better to use; and of course we return
   a file handle (or NULL) instead of a status indicator.  */

static FILE *
runpopen (char *cmd, const char *mode)
{
  FILE *f = NULL;
  char *safecmd = NULL;
  char *cmdname = NULL;
  int allow;

  /* If restrictedshell == 0, any command is allowed. */
  if (restrictedshell == 0)
    allow = 1;
  else
    allow = shell_cmd_is_allowed (cmd, &safecmd, &cmdname);

  if (allow == 1)
    f = popen (cmd, mode);
  else if (allow == 2)
    f = popen (safecmd, mode);
  else if (allow == -1)
    fprintf (stderr, "\nrunpopen quotation error in command line: %s\n",
             cmd);
  else
    fprintf (stderr, "\nrunpopen command not allowed: %s\n", cmdname);

  if (safecmd)
    free (safecmd);
  if (cmdname)
    free (cmdname);
  return f;
}
#endif /* pdfTeX */
#endif /* TeX */

/* The main program, etc.  */

#ifdef XeTeX
#include "xetexdir/XeTeX_ext.h"
#endif

/* What we were invoked as and with.  */
char **argv;
int argc;

/* If the user overrides argv[0] with -progname.  */
static const_string user_progname;

/* The C version of what might wind up in DUMP_VAR.  */
static const_string dump_name;

/* The C version of the jobname, if given. */
static const_string c_job_name;

/* The filename for dynamic character translation, or NULL.  */
string translate_filename;
string default_translate_filename;

#if defined(TeX)
/* Needed for --src-specials option. */
static char *last_source_name;
static int last_lineno;
static boolean srcspecialsoption = false;
static void parse_src_specials_option (const_string);
#endif

/* Parsing a first %&-line in the input file. */
static void parse_first_line (const_string);

/* Parse option flags. */
static void parse_options (int, string *);

/* Try to figure out if we have been given a filename. */
static string get_input_file_name (void);

#if defined(Aleph)
/* Declare this for Omega family, so they can parse the -8bit option,
 * even though it is a no-op for them.
 */
static int eightbitp;
#endif /* Aleph */

/* Get a true/false value for a variable from texmf.cnf and the environment. */
static boolean
texmf_yesno(const_string var)
{
  string value = kpse_var_value (var);
  return value && (*value == 't' || *value == 'y' || *value == '1');
}

#ifdef pdfTeX
const char *ptexbanner = BANNER;
#endif

/* The entry point: set up for reading the command line, which will
   happen in `topenin', then call the main body.  */

void
maininit (int ac, string *av)
{
  string main_input_file;

  /* Save to pass along to topenin.  */
  argc = ac;
  argv = av;

  /* Must be initialized before options are parsed.  */
  interactionoption = 4;

  /* Have things to record as we go along.  */
  kpse_record_input = recorder_record_input;
  kpse_record_output = recorder_record_output;

#if defined(__SyncTeX__)
  /* 0 means "disable Synchronize TeXnology".
     synctexoption is a *.web variable.
     We initialize it to a weird value to catch the -synctex command line flag.
     At runtime, if synctexoption is not INT_MAX, then it contains the
     command line option provided; otherwise, no such option was given
     by the user.  */
# define SYNCTEX_NO_OPTION INT_MAX
  synctexoption = SYNCTEX_NO_OPTION;
#endif

#if IS_pTeX
  kpse_set_program_name (argv[0], NULL);
  initdefaultkanji ();
#endif

  /* If the user says --help or --version, we need to notice early.  And
     since we want the --ini option, have to do it before getting into
     the web (which would read the base file, etc.).  */
  parse_options (ac, av);

  /* If -progname was not specified, default to the dump name.  */
  if (!user_progname)
    user_progname = dump_name;
  
  /* Do this early so we can inspect kpse_invocation_name and
     kpse_program_name below, and because we have to do this before
     any path searching.  */
#if IS_pTeX
  if (user_progname)
    kpse_reset_program_name (user_progname);
#else
  kpse_set_program_name (argv[0], user_progname);
#endif

  /* FIXME: gather engine names in a single spot. */
  xputenv ("engine", TEXMFENGINENAME);
  
  /* Were we given a simple filename? */
  main_input_file = get_input_file_name();

  /* Second chance to activate file:line:error style messages, this
     time from texmf.cnf. */
  if (filelineerrorstylep < 0) {
    filelineerrorstylep = 0;
  } else if (!filelineerrorstylep) {
    filelineerrorstylep = texmf_yesno ("file_line_error_style");
  }

  /* If no dump default yet, and we're not doing anything special on
     this run, we may want to look at the first line of the main input
     file for a %&<dumpname> specifier.  */
  if (parsefirstlinep < 0) {
    parsefirstlinep = 0;
  } else if (!parsefirstlinep) {
    parsefirstlinep = texmf_yesno ("parse_first_line");
  }
  if (parsefirstlinep && (!dump_name || !translate_filename)) {
    parse_first_line (main_input_file);
  }
  /* Check whether there still is no translate_filename known.  If so,
     use the default_translate_filename. */
  /* FIXME: deprecated. */
  if (!translate_filename) {
    translate_filename = default_translate_filename;
  }
  /* If we're preloaded, I guess everything is set up.  I don't really
     know any more, it's been so long since anyone preloaded.  */
  if (readyalready != 314159) {
    /* The `ini_version' variable is declared/used in the change files.  */
    boolean virversion = false;
    if (FILESTRCASEEQ (kpse_program_name, INI_PROGRAM)) {
      iniversion = true;
    } else if (FILESTRCASEEQ (kpse_program_name, VIR_PROGRAM)) {
      virversion = true;
#ifdef TeX
    } else if (FILESTRCASEEQ (kpse_program_name, "initex")) {
      iniversion = true;
    } else if (FILESTRCASEEQ (kpse_program_name, "virtex")) {
      virversion = true;
#ifndef Aleph
    } else if (FILESTRCASEEQ (kpse_program_name, "mltex")) {
      mltexp = true;
#endif /* !Aleph */
#endif /* TeX */
    }

    if (!dump_name) {
      /* If called as *vir{mf,tex,mpost} use `plain'.  Otherwise, use the
         name we were invoked under.  */
      dump_name = (virversion ? "plain" : kpse_program_name);
    }
  }
  
#ifdef TeX
  /* Sanity check: -mltex, -enc, -etex only work in combination with -ini. */
  if (!iniversion) {
#if !defined(Aleph)
    if (mltexp) {
      fprintf(stderr, "-mltex only works with -ini\n");
    }
#if !defined(XeTeX) && !IS_pTeX
    if (enctexp) {
      fprintf(stderr, "-enc only works with -ini\n");
    }
#endif
#endif
#if IS_eTeX
    if (etexp) {
      fprintf(stderr, "-etex only works with -ini\n");
    }
#endif
  }
#endif
  
  /* If we've set up the fmt/base default in any of the various ways
     above, also set its length.  */
  if (dump_name) {
    const_string with_ext = NULL;
    unsigned name_len = strlen (dump_name);
    unsigned ext_len = strlen (DUMP_EXT);
    
    /* Provide extension if not there already.  */
    if (name_len > ext_len
        && FILESTRCASEEQ (dump_name + name_len - ext_len, DUMP_EXT)) {
      with_ext = dump_name;
    } else {
      with_ext = concat (dump_name, DUMP_EXT);
    }
    DUMP_VAR = concat (" ", with_ext); /* adjust array for Pascal */
    DUMP_LENGTH_VAR = strlen (DUMP_VAR + 1);
  } else {
    /* For dump_name to be NULL is a bug.  */
    abort();
  }

  /* Additional initializations.  No particular reason for doing them
     here instead of first thing in the change file; less symbols to
     propagate through Webc, that's all.  */
#ifdef MF
  kpse_set_program_enabled (kpse_mf_format, MAKE_TEX_MF_BY_DEFAULT,
                            kpse_src_compile);
  kpse_set_program_enabled (kpse_base_format, MAKE_TEX_FMT_BY_DEFAULT,
                            kpse_src_compile);
#endif /* MF */
#ifdef TeX
#if defined (Aleph)
  kpse_set_program_enabled (kpse_ocp_format, MAKE_OMEGA_OCP_BY_DEFAULT,
                            kpse_src_compile);
  kpse_set_program_enabled (kpse_ofm_format, MAKE_OMEGA_OFM_BY_DEFAULT,
                            kpse_src_compile);
  kpse_set_program_enabled (kpse_tfm_format, false, kpse_src_compile);
#else /* !Aleph */
  kpse_set_program_enabled (kpse_tfm_format, MAKE_TEX_TFM_BY_DEFAULT,
                            kpse_src_compile);
#endif /* !Aleph */
  kpse_set_program_enabled (kpse_tex_format, MAKE_TEX_TEX_BY_DEFAULT,
                            kpse_src_compile);
  kpse_set_program_enabled (kpse_fmt_format, MAKE_TEX_FMT_BY_DEFAULT,
                            kpse_src_compile);

  init_shell_escape ();

  if (!outputcomment) {
    outputcomment = kpse_var_value ("output_comment");
  }
#endif /* TeX */
}

#if !defined(WIN32) || defined(__MINGW32__)
/* The entry point: set up for reading the command line, which will
   happen in `topenin', then call the main body.  */

int
main (int ac, string *av)
{
#ifdef __EMX__
  _wildcard (&ac, &av);
  _response (&ac, &av);
#endif

#ifdef WIN32
  _setmaxstdio(2048);
#endif

  maininit (ac, av);

  /* Call the real main program.  */
  mainbody ();

  return EXIT_SUCCESS;
}
#endif /* !WIN32 || __MINGW32__ */

/* This is supposed to ``open the terminal for input'', but what we
   really do is copy command line arguments into TeX's or Metafont's
   buffer, so they can handle them.  If nothing is available, or we've
   been called already (and hence, argc==0), we return with
   `last=first'.  */

void
topenin (void)
{
  int i;

#ifdef XeTeX
  static UFILE termin_file;
  if (termin == 0) {
    termin = &termin_file;
    termin->f = stdin;
    termin->savedChar = -1;
    termin->skipNextLF = 0;
    termin->encodingMode = UTF8;
    termin->conversionData = 0;
    inputfile[0] = termin;
  }
#endif

  buffer[first] = 0; /* In case there are no arguments.  */

  if (optind < argc) { /* We have command line arguments.  */
    int k = first;
    for (i = optind; i < argc; i++) {
#ifdef XeTeX
      unsigned char *ptr = (unsigned char *)&(argv[i][0]);
      /* need to interpret UTF8 from the command line */
      UInt32 rval;
      while ((rval = *(ptr++)) != 0) {
        UInt16 extraBytes = bytesFromUTF8[rval];
        switch (extraBytes) { /* note: code falls through cases! */
          case 5: rval <<= 6; if (*ptr) rval += *(ptr++);
          case 4: rval <<= 6; if (*ptr) rval += *(ptr++);
          case 3: rval <<= 6; if (*ptr) rval += *(ptr++);
          case 2: rval <<= 6; if (*ptr) rval += *(ptr++);
          case 1: rval <<= 6; if (*ptr) rval += *(ptr++);
          case 0: ;
        };
        rval -= offsetsFromUTF8[extraBytes];
        buffer[k++] = rval;
      }
#else
      char *ptr = &(argv[i][0]);
      /* Don't use strcat, since in Aleph the buffer elements aren't
         single bytes.  */
      while (*ptr) {
        buffer[k++] = *(ptr++);
      }
#endif
      buffer[k++] = ' ';
    }
    argc = 0;	/* Don't do this again.  */
    buffer[k] = 0;
  }

  /* Find the end of the buffer.  */
  for (last = first; buffer[last]; ++last)
    ;

  /* Make `last' be one past the last non-blank character in `buffer'.  */
  /* ??? The test for '\r' should not be necessary.  */
  for (--last; last >= first
       && ISBLANK (buffer[last]) && buffer[last] != '\r'; --last) 
    ;
  last++;

  /* One more time, this time converting to TeX's internal character
     representation.  */
#if !defined(Aleph) && !defined(XeTeX)
  for (i = first; i < last; i++)
    buffer[i] = xord[buffer[i]];
#endif
}

/* IPC for TeX.  By Tom Rokicki for the NeXT; it makes TeX ship out the
   DVI file in a pipe to TeXView so that the output can be displayed
   incrementally.  Shamim Mohamed adapted it for Web2c.  */
#if defined (TeX) && defined (IPC)

#ifdef WIN32
#include <winsock2.h>
#else
#include <sys/socket.h>
#include <fcntl.h>
#ifndef O_NONBLOCK /* POSIX */
#ifdef O_NDELAY    /* BSD */
#define O_NONBLOCK O_NDELAY
#elif defined(O_FNDELAY)     /* NeXT */
#define O_NONBLOCK O_FNDELAY
#else
what the fcntl? cannot implement IPC without equivalent for O_NONBLOCK.
#endif
#endif /* no O_NONBLOCK */
#endif /* !WIN32 */

#ifndef IPC_PIPE_NAME /* $HOME is prepended to this.  */
#define IPC_PIPE_NAME "/.TeXview_Pipe"
#endif
#ifndef IPC_SERVER_CMD /* Command to run to start the server.  */
#define IPC_SERVER_CMD "open `which TeXview`"
#endif

struct msg
{
  short namelength; /* length of auxiliary data */
  int eof;   /* new eof for dvi file */
#if 0  /* see usage of struct msg below */
  char more_data[0]; /* where the rest of the stuff goes */ 
#endif
};

static char *ipc_name;
static struct sockaddr *ipc_addr;
static int ipc_addr_len;

static int
ipc_make_name (void)
{
  if (ipc_addr_len == 0) {
    string s = getenv ("HOME");
    if (s) {
      ipc_addr = xmalloc (strlen (s) + 40);
      ipc_addr->sa_family = 0;
      ipc_name = ipc_addr->sa_data;
      strcpy (ipc_name, s);
      strcat (ipc_name, IPC_PIPE_NAME);
      ipc_addr_len = strlen (ipc_name) + 3;
    }
  }
  return ipc_addr_len;
}

static int sock = -1;

static int
ipc_is_open (void)
{
   return sock >= 0;
}

static void
ipc_open_out (void) {
#ifdef WIN32
  u_long mode = 1;
#endif
#ifdef IPC_DEBUG
  fputs ("tex: Opening socket for IPC output ...\n", stderr);
#endif
  if (sock >= 0) {
    return;
  }

  if (ipc_make_name () < 0) {
    sock = -1;
    return;
  }

  sock = socket (PF_UNIX, SOCK_STREAM, 0);
  if (sock >= 0) {
    if (connect (sock, ipc_addr, ipc_addr_len) != 0 ||
#ifdef WIN32
        ioctlsocket (sock, FIONBIO, &mode) < 0
#else
        fcntl (sock, F_SETFL, O_NONBLOCK) < 0
#endif
        ) {
      close (sock);
      sock = -1;
      return;
    }
#ifdef IPC_DEBUG
    fputs ("tex: Successfully opened IPC socket.\n", stderr);
#endif
  }
}

static void
ipc_close_out (void)
{
#ifdef IPC_DEBUG
  fputs ("tex: Closing output socket ...\n", stderr);
#endif
  if (ipc_is_open ()) {
    close (sock);
    sock = -1;
  }
}


static void
ipc_snd (int n, int is_eof, char *data)
{
  struct
  {
    struct msg msg;
    char more_data[1024];
  } ourmsg;

  if (!ipc_is_open ()) {
    return;
  }

#ifdef IPC_DEBUG
  fputs ("tex: Sending message to socket ...\n", stderr);
#endif
  ourmsg.msg.namelength = n;
  ourmsg.msg.eof = is_eof;
  if (n) {
    strcpy (ourmsg.more_data, data);
  }
  n += sizeof (struct msg);
#ifdef IPC_DEBUG
  fputs ("tex: Writing to socket...\n", stderr);
#endif
  if (write (sock, &ourmsg, n) != n) {
    ipc_close_out ();
  }
#ifdef IPC_DEBUG
  fputs ("tex: IPC message sent.\n", stderr);
#endif
}

/* This routine notifies the server if there is an eof, or the filename
   if a new DVI file is starting.  This is the routine called by TeX.
   Aleph defines str_start(#) as str_start_ar[# - too_big_char], with
   too_big_char = biggest_char + 1 = 65536 (omstr.ch).  */

void
ipcpage (int is_eof)
{
  static boolean begun = false;
  unsigned len = 0;
  string p = NULL;

  if (!begun) {
    string name; /* Just the filename.  */
    string cwd = xgetcwd ();
    
    ipc_open_out ();
#if !defined(Aleph)
    len = strstart[outputfilename + 1] - strstart[outputfilename];
#else
    len = strstartar[outputfilename + 1 - 65536L] -
            strstartar[outputfilename - 65536L];
#endif
    name = xmalloc (len + 1);
#if !defined(Aleph)
    strncpy (name, (string)&strpool[strstart[outputfilename]], len);
#else
    {
    unsigned i;
    for (i=0; i<len; i++)
      name[i] =  strpool[i+strstartar[outputfilename - 65536L]];
    }
#endif
    name[len] = 0;

    /* Have to pass whole filename to the other end, since it may have
       been started up and running as a daemon, e.g., as with the NeXT
       preview program.  */
    p = concat3 (cwd, DIR_SEP_STRING, name);
    free (cwd);
    free (name);

#if defined (WIN32)
    { char *q;
      for (q = p; *q; q++) {
        if (*q == '\\')
          *q = '/';
        else if (IS_KANJI(q))
          q++;
      }
    }
#endif
    len = strlen(p);
    begun = true;
  }
  ipc_snd (len, is_eof, p);
  
  if (p)
    free (p);
}
#endif /* TeX && IPC */

#if defined (TeX) || defined (MF)
  /* TCX and Aleph&Co get along like sparks and gunpowder. */
#if !defined(Aleph) && !defined(XeTeX)

/* Return the next number following START, setting POST to the following
   character, as in strtol.  Issue a warning and return -1 if no number
   can be parsed.  */

static int
tcx_get_num (int upb,
             unsigned line_count,
             string start,
             string *post)
{
  int num = strtol (start, post, 0);
  assert (post && *post);
  if (*post == start) {
    /* Could not get a number. If blank line, fine. Else complain.  */
    string p = start;
    while (*p && ISSPACE (*p))
      p++;
    if (*p != 0)
      fprintf (stderr, "%s:%d: Expected numeric constant, not `%s'.\n",
               translate_filename, line_count, start);
    num = -1;
  } else if (num < 0 || num > upb) {
    fprintf (stderr, "%s:%d: Destination charcode %d <0 or >%d.\n",
             translate_filename, line_count, num, upb);
    num = -1;
  }  

  return num;
}

/* Update the xchr, xord, and xprn arrays for TeX, allowing a
   translation table specified at runtime via an external file.
   Look for the character translation file FNAME along the same path as
   tex.pool.  If no suffix in FNAME, use .tcx (don't bother trying to
   support extension-less names for these files).  */

/* FIXME: A new format ought to be introduced for these files. */

void
readtcxfile (void)
{
  string orig_filename;
  if (!find_suffix (translate_filename)) {
    translate_filename = concat (translate_filename, ".tcx");
  }
  orig_filename = translate_filename;
  translate_filename
    = kpse_find_file (translate_filename, kpse_web2c_format, true);
  if (translate_filename) {
    string line;
    unsigned line_count = 0;
    FILE *translate_file = xfopen (translate_filename, FOPEN_R_MODE);
    while ((line = read_line (translate_file))) {
      int first;
      string start2;
      string comment_loc = strchr (line, '%');
      if (comment_loc)
        *comment_loc = 0;

      line_count++;

      first = tcx_get_num (255, line_count, line, &start2);
      if (first >= 0) {
        string start3;
        int second;
        int printable;
        
        second = tcx_get_num (255, line_count, start2, &start3);
        if (second >= 0) {
            /* I suppose we could check for nonempty junk following the
               "printable" code, but let's not bother.  */
          string extra;
            
          /* If they mention a second code, make that the internal number.  */
          xord[first] = second;
          xchr[second] = first;

          printable = tcx_get_num (1, line_count, start3, &extra);
          /* Not-a-number, may be a comment. */
          if (printable == -1)
            printable = 1;
          /* Don't allow the 7bit ASCII set to become unprintable. */
          if (32 <= second && second <= 126)
            printable = 1;
        } else {
          second = first; /* else make internal the same as external */
          /* If they mention a charcode, call it printable.  */
          printable = 1;
        }

        xprn[second] = printable;
      }
      free (line);
    }
    xfclose(translate_file, translate_filename);
  } else {
    WARNING1 ("Could not open char translation file `%s'", orig_filename);
  }
}
#endif /* !Aleph && !XeTeX */
#endif /* TeX || MF [character translation] */

#ifdef XeTeX /* XeTeX handles this differently, and allows odd quotes within names */
string
normalize_quotes (const_string name, const_string mesg)
{
    int quote_char = 0;
    boolean must_quote = false;
    int len = strlen(name);
    /* Leave room for quotes and NUL. */
    string ret;
    string p;
    const_string q;
    for (q = name; *q; q++) {
        if (*q == ' ') {
            if (!must_quote) {
                len += 2;
                must_quote = true;
            }
        }
        else if (*q == '\"' || *q == '\'') {
            must_quote = true;
            if (quote_char == 0)
                quote_char = '\"' + '\'' - *q;
            len += 2; /* this could sometimes add length we don't need */
        }
    }
    ret = xmalloc(len + 1);
    p = ret;
    if (must_quote) {
        if (quote_char == 0)
            quote_char = '\"';
        *p++ = quote_char;
    }
    for (q = name; *q; q++) {
        if (*q == quote_char) {
            *p++ = quote_char;
            quote_char = '\"' + '\'' - quote_char;
            *p++ = quote_char;
        }
        *p++ = *q;
    }
    if (quote_char != 0)
        *p++ = quote_char;
    *p = '\0';
    return ret;
}
#else
/* Normalize quoting of filename -- that is, only quote if there is a space,
   and always use the quote-name-quote style. */
string
normalize_quotes (const_string name, const_string mesg)
{
    boolean quoted = false;
    boolean must_quote = (strchr(name, ' ') != NULL);
    /* Leave room for quotes and NUL. */
    string ret = xmalloc(strlen(name)+3);
    string p;
    const_string q;
    p = ret;
    if (must_quote)
        *p++ = '"';
    for (q = name; *q; q++) {
        if (*q == '"')
            quoted = !quoted;
        else
            *p++ = *q;
    }
    if (must_quote)
        *p++ = '"';
    *p = '\0';
    if (quoted) {
        fprintf(stderr, "! Unbalanced quotes in %s %s\n", mesg, name);
        uexit(1);
    }
    return ret;
}
#endif

/* Getting the input filename. */
string
get_input_file_name (void)
{
  string input_file_name = NULL;

  if (argv[optind] && argv[optind][0] != '&' && argv[optind][0] != '\\') {
    /* Not &format, not \input, so assume simple filename. */    
#ifdef XeTeX
    string name = normalize_quotes(argv[optind], "argument");
    input_file_name = kpse_find_file(argv[optind], INPUT_FORMAT, false);
    argv[optind] = name;
#else
    string name = normalize_quotes(argv[optind], "argument");
    boolean quoted = (name[0] == '"');
    if (quoted) {
        /* Overwrite last quote and skip first quote. */
        name[strlen(name)-1] = '\0';
        name++;
    }
    input_file_name = kpse_find_file(name, INPUT_FORMAT, false);
    if (quoted) {
        /* Undo modifications */
        name[strlen(name)] = '"';
        name--;
    }
    argv[optind] = name;
#endif
  }
  return input_file_name;
}

/* Reading the options.  */

/* Test whether getopt found an option ``A''.
   Assumes the option index is in the variable `option_index', and the
   option table in a variable `long_options'.  */
#define ARGUMENT_IS(a) STREQ (long_options[option_index].name, a)

/* SunOS cc can't initialize automatic structs, so make this static.  */
static struct option long_options[]
  = { { DUMP_OPTION,                 1, 0, 0 },
#ifdef TeX
      /* FIXME: Obsolete -- for backward compatibility only. */
      { "efmt",                      1, 0, 0 },
#endif
      { "help",                      0, 0, 0 },
      { "ini",                       0, &iniversion, 1 },
      { "interaction",               1, 0, 0 },
      { "halt-on-error",             0, &haltonerrorp, 1 },
      { "kpathsea-debug",            1, 0, 0 },
      { "progname",                  1, 0, 0 },
      { "version",                   0, 0, 0 },
      { "recorder",                  0, &recorder_enabled, 1 },
#ifdef TeX
#ifdef IPC
      { "ipc",                       0, &ipcon, 1 },
      { "ipc-start",                 0, &ipcon, 2 },
#endif /* IPC */
#if !defined(Aleph)
      { "mltex",                     0, &mltexp, 1 },
#if !defined(XeTeX) && !IS_pTeX
      { "enc",                       0, &enctexp, 1 },
#endif
#endif /* !Aleph */
#if IS_eTeX
      { "etex",                      0, &etexp, 1 },
#endif
      { "output-comment",            1, 0, 0 },
#if defined(pdfTeX)
      { "draftmode",                 0, 0, 0 },
      { "output-format",             1, 0, 0 },
#endif /* pdfTeX */
      { "shell-escape",              0, &shellenabledp, 1 },
      { "no-shell-escape",           0, &shellenabledp, -1 },
      { "enable-write18",            0, &shellenabledp, 1 },
      { "disable-write18",           0, &shellenabledp, -1 },
      { "shell-restricted",          0, 0, 0 },
      { "debug-format",              0, &debugformatfile, 1 },
      { "src-specials",              2, 0, 0 },
#if defined(__SyncTeX__)
      /* Synchronization: just like "interaction" above */
      { "synctex",                   1, 0, 0 },
#endif
#endif /* TeX */
#if defined (TeX) || defined (MF)
      { "file-line-error-style",     0, &filelineerrorstylep, 1 },
      { "no-file-line-error-style",  0, &filelineerrorstylep, -1 },
      /* Shorter option names for the above. */
      { "file-line-error",           0, &filelineerrorstylep, 1 },
      { "no-file-line-error",        0, &filelineerrorstylep, -1 },
      { "jobname",                   1, 0, 0 },
      { "output-directory",          1, 0, 0 },
      { "parse-first-line",          0, &parsefirstlinep, 1 },
      { "no-parse-first-line",       0, &parsefirstlinep, -1 },
      { "translate-file",            1, 0, 0 },
      { "default-translate-file",    1, 0, 0 },
      { "8bit",                      0, &eightbitp, 1 },
#if defined(XeTeX)
      { "no-pdf",                    0, &nopdfoutput, 1 },
      { "output-driver",             1, 0, 0 },
      { "papersize",                 1, 0, 0 },
#endif /* XeTeX */
      { "mktex",                     1, 0, 0 },
      { "no-mktex",                  1, 0, 0 },
#endif /* TeX or MF */
#if IS_pTeX
#ifdef WIN32
      { "sjis-terminal",             0, &sjisterminal, 1 },
      { "guess-input-enc",           0, &infile_enc_auto, 1 },
      { "no-guess-input-enc",        0, &infile_enc_auto, 0 },
#endif
      { "kanji",                     1, 0, 0 },
#endif
#if IS_upTeX
      { "kanji-internal",            1, 0, 0 },
#endif
      { 0, 0, 0, 0 } };

static void
parse_options (int argc, string *argv)
{
  int g;   /* `getopt' return code.  */
  int option_index;

  for (;;) {
    g = getopt_long_only (argc, argv, "+", long_options, &option_index);

    if (g == -1) /* End of arguments, exit the loop.  */
      break;

    if (g == '?') { /* Unknown option.  */
      /* FIXME: usage (argv[0]); replaced by continue. */
      continue;
    }

    assert (g == 0); /* We have no short option names.  */

    if (ARGUMENT_IS ("kpathsea-debug")) {
      kpathsea_debug |= atoi (optarg);

#ifdef XeTeX
    } else if (ARGUMENT_IS ("papersize")) {
      papersize = optarg;
    } else if (ARGUMENT_IS ("output-driver")) {
      outputdriver = optarg;
#endif

    } else if (ARGUMENT_IS ("progname")) {
      user_progname = optarg;

    } else if (ARGUMENT_IS ("jobname")) {
#ifdef XeTeX
      c_job_name = optarg;
#else
      c_job_name = normalize_quotes (optarg, "jobname");
#endif

    } else if (ARGUMENT_IS (DUMP_OPTION)) {
      dump_name = optarg;
      dumpoption = true;

#ifdef TeX
    /* FIXME: Obsolete -- for backward compatibility only. */
    } else if (ARGUMENT_IS ("efmt")) {
      dump_name = optarg;
      dumpoption = true;
#endif

    } else if (ARGUMENT_IS ("output-directory")) {
      output_directory = optarg;
      
#ifdef TeX
    } else if (ARGUMENT_IS ("output-comment")) {
      unsigned len = strlen (optarg);
      if (len < 256) {
        outputcomment = optarg;
      } else {
        WARNING2 ("Comment truncated to 255 characters from %d. (%s)",
                  len, optarg);
        outputcomment = xmalloc (256);
        strncpy (outputcomment, optarg, 255);
        outputcomment[255] = 0;
      }

#ifdef IPC
    } else if (ARGUMENT_IS ("ipc-start")) {
      ipc_open_out ();
      /* Try to start up the other end if it's not already.  */
      if (!ipc_is_open ()) {
        if (system (IPC_SERVER_CMD) == 0) {
          unsigned i;
          for (i = 0; i < 20 && !ipc_is_open (); i++) {
#ifdef WIN32
            Sleep (2000);
#else
            sleep (2);
#endif
            ipc_open_out ();
          }
        }
      }
#endif /* IPC */

    } else if (ARGUMENT_IS ("shell-restricted")) {
      shellenabledp = 1;
      restrictedshell = 1;
      
    } else if (ARGUMENT_IS ("src-specials")) {
       last_source_name = xstrdup("");
       /* Option `--src" without any value means `auto' mode. */
       if (optarg == NULL) {
         insertsrcspecialeverypar = true;
         insertsrcspecialauto = true;
         srcspecialsoption = true;
         srcspecialsp = true;
       } else {
          parse_src_specials_option(optarg);
       }
#endif /* TeX */
#if defined(pdfTeX)
    } else if (ARGUMENT_IS ("output-format")) {
       pdfoutputoption = 1;
       if (strcmp(optarg, "dvi") == 0) {
         pdfoutputvalue = 0;
       } else if (strcmp(optarg, "pdf") == 0) {
         pdfoutputvalue = 2;
       } else {
         WARNING1 ("Ignoring unknown value `%s' for --output-format", optarg);
         pdfoutputoption = 0;
       }
    } else if (ARGUMENT_IS ("draftmode")) {
      pdfdraftmodeoption = 1;
      pdfdraftmodevalue = 1;
#endif /* pdfTeX */
#if defined (TeX) || defined (MF)
    } else if (ARGUMENT_IS ("translate-file")) {
      translate_filename = optarg;
    } else if (ARGUMENT_IS ("default-translate-file")) {
      default_translate_filename = optarg;
#if defined(Aleph)
    } else if (ARGUMENT_IS ("8bit")) {
      /* FIXME: print snippy message? Possibly also for above? */
#endif /* !Aleph */
    } else if (ARGUMENT_IS ("mktex")) {
      kpse_maketex_option (optarg, true);

    } else if (ARGUMENT_IS ("no-mktex")) {
      kpse_maketex_option (optarg, false);
#endif /* TeX or MF */
    } else if (ARGUMENT_IS ("interaction")) {
        /* These numbers match @d's in *.ch */
      if (STREQ (optarg, "batchmode")) {
        interactionoption = 0;
      } else if (STREQ (optarg, "nonstopmode")) {
        interactionoption = 1;
      } else if (STREQ (optarg, "scrollmode")) {
        interactionoption = 2;
      } else if (STREQ (optarg, "errorstopmode")) {
        interactionoption = 3;
      } else {
        WARNING1 ("Ignoring unknown argument `%s' to --interaction", optarg);
      }
#if IS_pTeX
    } else if (ARGUMENT_IS ("kanji")) {
      if (!set_enc_string (optarg, NULL)) {
        WARNING1 ("Ignoring unknown argument `%s' to --kanji", optarg);
      }
#endif
#if IS_upTeX
    } else if (ARGUMENT_IS ("kanji-internal")) {
      if (!set_enc_string (NULL, optarg)) {
        WARNING1 ("Ignoring unknown argument `%s' to --kanji-internal", optarg);
      }
#endif

    } else if (ARGUMENT_IS ("help")) {
        usagehelp (PROGRAM_HELP, BUG_ADDRESS);

#if defined(__SyncTeX__)
    } else if (ARGUMENT_IS ("synctex")) {
		/* Synchronize TeXnology: catching the command line option as a long  */
		synctexoption = (int) strtol(optarg, NULL, 0);
#endif

    } else if (ARGUMENT_IS ("version")) {
        char *versions;
#if defined (pdfTeX) || defined(XeTeX)
        initversionstring(&versions); 
#else
        versions = NULL;
#endif
        printversionandexit (BANNER, COPYRIGHT_HOLDER, AUTHOR, versions);

    } /* Else it was a flag; getopt has already done the assignment.  */
  }
}

#if defined(TeX)
void 
parse_src_specials_option (const_string opt_list)
{
  char * toklist = xstrdup(opt_list);
  char * tok;
  insertsrcspecialauto = false;
  tok = strtok (toklist, ", ");
  while (tok) {
    if (strcmp (tok, "everypar") == 0
        || strcmp (tok, "par") == 0
        || strcmp (tok, "auto") == 0) {
      insertsrcspecialauto = true;
      insertsrcspecialeverypar = true;
    } else if (strcmp (tok, "everyparend") == 0
               || strcmp (tok, "parend") == 0)
      insertsrcspecialeveryparend = true;
    else if (strcmp (tok, "everycr") == 0
             || strcmp (tok, "cr") == 0)
      insertsrcspecialeverycr = true;
    else if (strcmp (tok, "everymath") == 0
             || strcmp (tok, "math") == 0)
      insertsrcspecialeverymath = true;
    else if (strcmp (tok, "everyhbox") == 0
             || strcmp (tok, "hbox") == 0)
      insertsrcspecialeveryhbox = true;
    else if (strcmp (tok, "everyvbox") == 0
             || strcmp (tok, "vbox") == 0)
      insertsrcspecialeveryvbox = true;
    else if (strcmp (tok, "everydisplay") == 0
             || strcmp (tok, "display") == 0)
      insertsrcspecialeverydisplay = true;
    else if (strcmp (tok, "none") == 0) {
      /* This one allows to reset an option that could appear in texmf.cnf */
      insertsrcspecialauto = insertsrcspecialeverypar = 
        insertsrcspecialeveryparend = insertsrcspecialeverycr = 
        insertsrcspecialeverymath =  insertsrcspecialeveryhbox =
        insertsrcspecialeveryvbox = insertsrcspecialeverydisplay = false;
    } else {
      WARNING1 ("Ignoring unknown argument `%s' to --src-specials", tok);
    }
    tok = strtok(0, ", ");
  }
  free(toklist);
  srcspecialsp=insertsrcspecialauto | insertsrcspecialeverypar |
    insertsrcspecialeveryparend | insertsrcspecialeverycr |
    insertsrcspecialeverymath |  insertsrcspecialeveryhbox |
    insertsrcspecialeveryvbox | insertsrcspecialeverydisplay;
  srcspecialsoption = true;
}
#endif

/* If the first thing on the command line (we use the globals `argv' and
   `optind') is a normal filename (i.e., does not start with `&' or
   `\'), and if we can open it, and if its first line is %&FORMAT, and
   FORMAT is a readable dump file, then set DUMP_VAR to FORMAT.
   Also call kpse_reset_program_name to ensure the correct paths for the
   format are used.  */
static void
parse_first_line (const_string filename)
{
  FILE *f = filename ? fopen (filename, FOPEN_R_MODE) : NULL;
  if (f) {
    string first_line = read_line (f);
    xfclose (f, filename);

    /* We deal with the general format "%&fmt --translate-file=tcx" */
    /* The idea of using this format came from Wlodzimierz Bzyl
       <matwb@monika.univ.gda.pl> */
    if (first_line && first_line[0] == '%' && first_line[1] == '&') {
      /* Parse the first line into at most three space-separated parts. */
      char *s;
      char *part[4];
      int npart;
      char **parse;

      for (s = first_line+2; ISBLANK(*s); ++s)
        ;
      npart = 0;
      while (*s && npart != 3) {
        part[npart++] = s;
        while (*s && *s != ' ') s++;
        while (*s == ' ') *s++ = '\0';
      }
      part[npart] = NULL;
      parse = part;
      /* Look at what we've got.  Very crude! */
      if (*parse && **parse != '-') {
        /* A format name */
        if (dump_name) {
          /* format already determined, do nothing. */
        } else {
          string f_name = concat (part[0], DUMP_EXT);
          string d_name = kpse_find_file (f_name, DUMP_FORMAT, false);
          if (d_name && kpse_readable_file (d_name)) {
            dump_name = xstrdup (part[0]);
            kpse_reset_program_name (dump_name);
            /* Tell TeX/MF/MP we have a %&name line... */
            dumpline = true;
          }
          free (f_name);
        }
        parse++;
      }
      /* The tcx stuff, if any.  Should we support the -translate-file
         form as well as --translate-file?  */
      if (*parse) {
        s = NULL;
        if (translate_filename) {
          /* TCX file already set, do nothing. */
        } else if (STREQ (*parse, "--translate-file")) {
          s = *(parse+1);
        } else if (STREQ (*parse, "-translate-file")) {
          s = *(parse+1);
        } else if (STRNEQ (*parse, "--translate-file=", 17)) {
          s = *parse+17;
        } else if (STRNEQ (*parse, "-translate-file=", 16)) {
          s = *parse+16;
        }
        /* Just set the name, no sanity checks here. */
        /* FIXME: remove trailing spaces. */
        if (s && *s) {
          translate_filename = xstrdup(s);
        }
      }
    }
    if (first_line)
      free (first_line);
  }
}

/* 
  piped I/O
 */

/* The code that implements popen() needs an array for tracking 
   possible pipe file pointers, because these need to be
   closed using pclose().
*/

#if defined(pdfTeX)

static FILE *pipes [] = {NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,
                         NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};

boolean
open_in_or_pipe (FILE **f_ptr, int filefmt, const_string fopen_mode)
{
    string fname = NULL;
    int i; /* iterator */

    /* opening a read pipe is straightforward, only have to
       skip past the pipe symbol in the file name. filename
       quoting is assumed to happen elsewhere (it does :-)) */

    if (shellenabledp && *(nameoffile+1) == '|') {
      /* the user requested a pipe */
      *f_ptr = NULL;
      fname = xmalloc(strlen((const_string)(nameoffile+1))+1);
      strcpy(fname,(const_string)(nameoffile+1));
      recorder_record_input (fname + 1);
      *f_ptr = runpopen(fname+1,"rb");
      free(fname);
      for (i=0; i<=15; i++) {
        if (pipes[i]==NULL) {
          pipes[i] = *f_ptr;
          break;
        }
      }
      if (*f_ptr)
        setvbuf (*f_ptr,NULL,_IOLBF,0);

      return *f_ptr != NULL;
    }

    return open_input(f_ptr,filefmt,fopen_mode) ;
}


boolean
open_out_or_pipe (FILE **f_ptr, const_string fopen_mode)
{
    string fname;
    int i; /* iterator */

    /* opening a write pipe takes a little bit more work, because TeX
       will perhaps have appended ".tex".  To avoid user confusion as
       much as possible, this extension is stripped only when the command
       is a bare word.  Some small string trickery is needed to make
       sure the correct number of bytes is free()-d afterwards */
	
    if (shellenabledp && *(nameoffile+1) == '|') {
      /* the user requested a pipe */
      fname = xmalloc(strlen((const_string)(nameoffile+1))+1);
      strcpy(fname,(const_string)(nameoffile+1));
      if (strchr (fname,' ')==NULL && strchr(fname,'>')==NULL) {
        /* mp and mf currently do not use this code, but it 
           is better to be prepared */
        if (STREQ((fname+strlen(fname)-4),".tex"))
          *(fname+strlen(fname)-4) = 0;
        *f_ptr = runpopen(fname+1,"wb");
        *(fname+strlen(fname)) = '.';
      } else {
        *f_ptr = runpopen(fname+1,"wb");
      }
      recorder_record_output (fname + 1);
      free(fname);

      for (i=0; i<=15; i++) {
        if (pipes[i]==NULL) {
          pipes[i] = *f_ptr;
          break;
        }
      }

      if (*f_ptr)
        setvbuf(*f_ptr,NULL,_IOLBF,0);

      return *f_ptr != NULL;
    }

    return open_output(f_ptr,fopen_mode);
}


void
close_file_or_pipe (FILE *f)
{
  int i; /* iterator */

  if (shellenabledp) {
    /* if this file was a pipe, pclose() it and return */    
    for (i=0; i<=15; i++) {
      if (pipes[i] == f) {
        if (f) {
          pclose (f);
        }
        pipes[i] = NULL;
        return;
      }
    }
  }
  close_file(f);
}
#endif

/* All our interrupt handler has to do is set TeX's or Metafont's global
   variable `interrupt'; then they will do everything needed.  */
#ifdef WIN32
/* Win32 doesn't set SIGINT ... */
static BOOL WINAPI
catch_interrupt (DWORD arg)
{
  switch (arg) {
  case CTRL_C_EVENT:
  case CTRL_BREAK_EVENT:
    interrupt = 1;
    return TRUE;
  default:
    /* No need to set interrupt as we are exiting anyway */
    return FALSE;
  }
}
#else /* not WIN32 */
static RETSIGTYPE
catch_interrupt (int arg)
{
  interrupt = 1;
#ifdef OS2
  (void) signal (SIGINT, SIG_ACK);
#else
  (void) signal (SIGINT, catch_interrupt);
#endif /* not OS2 */
}
#endif /* not WIN32 */

/* Besides getting the date and time here, we also set up the interrupt
   handler, for no particularly good reason.  It's just that since the
   `fix_date_and_time' routine is called early on (section 1337 in TeX,
   ``Get the first line of input and prepare to start''), this is as
   good a place as any.  */

void
get_date_and_time (integer *minutes,  integer *day,
                   integer *month,  integer *year)
{
  time_t myclock = time ((time_t *) 0);
  struct tm *tmptr = localtime (&myclock);

  *minutes = tmptr->tm_hour * 60 + tmptr->tm_min;
  *day = tmptr->tm_mday;
  *month = tmptr->tm_mon + 1;
  *year = tmptr->tm_year + 1900;

  {
#ifdef SA_INTERRUPT
    /* Under SunOS 4.1.x, the default action after return from the
       signal handler is to restart the I/O if nothing has been
       transferred.  The effect on TeX is that interrupts are ignored if
       we are waiting for input.  The following tells the system to
       return EINTR from read() in this case.  From ken@cs.toronto.edu.  */

    struct sigaction a, oa;

    a.sa_handler = catch_interrupt;
    sigemptyset (&a.sa_mask);
    sigaddset (&a.sa_mask, SIGINT);
    a.sa_flags = SA_INTERRUPT;
    sigaction (SIGINT, &a, &oa);
    if (oa.sa_handler != SIG_DFL)
      sigaction (SIGINT, &oa, (struct sigaction *) 0);
#else /* no SA_INTERRUPT */
#ifdef WIN32
    SetConsoleCtrlHandler(catch_interrupt, TRUE);
#else /* not WIN32 */
    RETSIGTYPE (*old_handler)(int);
    
    old_handler = signal (SIGINT, catch_interrupt);
    if (old_handler != SIG_DFL)
      signal (SIGINT, old_handler);
#endif /* not WIN32 */
#endif /* no SA_INTERRUPT */
  }
}

/*
 Getting a high resolution time.
 */
void
get_seconds_and_micros (integer *seconds,  integer *micros)
{
#if defined (HAVE_GETTIMEOFDAY)
  struct timeval tv;
  gettimeofday(&tv, NULL);
  *seconds = tv.tv_sec;
  *micros  = tv.tv_usec;
#elif defined (HAVE_FTIME)
  struct timeb tb;
  ftime(&tb);
  *seconds = tb.time;
  *micros  = tb.millitm*1000;
#else
  time_t myclock = time((time_t*)NULL);
  *seconds = myclock;
  *micros  = 0;
#endif
}

/*
  Generating a better seed numbers
  */
integer
getrandomseed(void)
{
#if defined (HAVE_GETTIMEOFDAY)
  struct timeval tv;
  gettimeofday(&tv, NULL);
  return (tv.tv_usec + 1000000 * tv.tv_usec);
#elif defined (HAVE_FTIME)
  struct timeb tb;
  ftime(&tb);
  return (tb.millitm + 1000 * tb.time);
#else
  time_t myclock = time ((time_t*)NULL);
  struct tm *tmptr = localtime(&myclock);
  return (tmptr->tm_sec + 60*(tmptr->tm_min + 60*tmptr->tm_hour));
#endif
}

/* Read a line of input as efficiently as possible while still looking
   like Pascal.  We set `last' to `first' and return `false' if we get
   to eof.  Otherwise, we return `true' and set last = first +
   length(line except trailing whitespace).  */

#ifndef XeTeX /* for XeTeX, we have a replacement function in XeTeX_ext.c */
boolean
input_line (FILE *f)
{
  int i = EOF;

  /* Recognize either LF or CR as a line terminator.  */
#if IS_pTeX
  last = input_line2(f, (char *)buffer, first, bufsize, &i);
#else
  last = first;
  while (last < bufsize && (i = getc (f)) != EOF && i != '\n' && i != '\r')
    buffer[last++] = i;
#endif

  if (i == EOF && errno != EINTR && last == first)
    return false;

  /* We didn't get the whole line because our buffer was too small.  */
  if (i != EOF && i != '\n' && i != '\r') {
    fprintf (stderr, "! Unable to read an entire line---bufsize=%u.\n",
                     (unsigned) bufsize);
    fputs ("Please increase buf_size in texmf.cnf.\n", stderr);
    uexit (1);
  }

  buffer[last] = ' ';
  if (last >= maxbufstack)
    maxbufstack = last;

  /* If next char is LF of a CRLF, read it.  */
  if (i == '\r') {
    while ((i = getc (f)) == EOF && errno == EINTR)
      ;
    if (i != '\n')
      ungetc (i, f);
  }
  
  /* Trim trailing whitespace.  */
  while (last > first && ISBLANK (buffer[last - 1]))
    --last;

  /* Don't bother using xord if we don't need to.  */
#if !defined(Aleph)
  for (i = first; i <= last; i++)
     buffer[i] = xord[buffer[i]];
#endif

#if IS_pTeX
  for (i = last+1; (i < last + 5 && i < bufsize) ; i++)
    buffer[i] = '\0';
#endif

  return true;
}
#endif /* !XeTeX */

/* This string specifies what the `e' option does in response to an
   error message.  */ 
static const_string edit_value = EDITOR;

/* This procedure originally due to sjc@s1-c.  TeX & Metafont call it when
   the user types `e' in response to an error, invoking a text editor on
   the erroneous source file.  FNSTART is how far into FILENAME the
   actual filename starts; FNLENGTH is how long the filename is.  */
   
void
calledit (packedASCIIcode *filename,
          poolpointer fnstart,
          integer fnlength,
          integer linenumber)
{
  char *temp, *command;
  char c;
  int sdone, ddone, i;

  sdone = ddone = 0;
  filename += fnstart;

  /* Close any open input files, since we're going to kill the job.  */
  for (i = 1; i <= inopen; i++)
#ifdef XeTeX
    xfclose (inputfile[i]->f, "inputfile");
#else
    xfclose (inputfile[i], "inputfile");
#endif

  /* Replace the default with the value of the appropriate environment
     variable or config file value, if it's set.  */
  temp = kpse_var_value (edit_var);
  if (temp != NULL)
    edit_value = temp;

  /* Construct the command string.  The `11' is the maximum length an
     integer might be.  */
  command = xmalloc (strlen (edit_value) + fnlength + 11);

  /* So we can construct it as we go.  */
  temp = command;

  while ((c = *edit_value++) != 0)
    {
      if (c == '%')
        {
          switch (c = *edit_value++)
            {
	    case 'd':
	      if (ddone)
                FATAL ("call_edit: `%%d' appears twice in editor command");
              sprintf (temp, "%ld", (long int)linenumber);
              while (*temp != '\0')
                temp++;
              ddone = 1;
              break;

	    case 's':
              if (sdone)
                FATAL ("call_edit: `%%s' appears twice in editor command");
              for (i =0; i < fnlength; i++)
		*temp++ = Xchr (filename[i]);
              sdone = 1;
              break;

	    case '\0':
              *temp++ = '%';
              /* Back up to the null to force termination.  */
	      edit_value--;
	      break;

	    default:
	      *temp++ = '%';
	      *temp++ = c;
	      break;
	    }
	}
      else
        *temp++ = c;
    }

  *temp = 0;

  /* Execute the command.  */
  {
    if (system (command) != 0)
      fprintf (stderr, "! Trouble executing `%s'.\n", command);
  }

  /* Quit, since we found an error.  */
  uexit (1);
}

/* Read and write dump files.  As distributed, these files are
   architecture dependent; specifically, BigEndian and LittleEndian
   architectures produce different files.  These routines always output
   BigEndian files.  This still does not guarantee them to be
   architecture-independent, because it is possible to make a format
   that dumps a glue ratio, i.e., a floating-point number.  Fortunately,
   none of the standard formats do that.  */

#if !defined (WORDS_BIGENDIAN) && !defined (NO_DUMP_SHARE) /* this fn */

/* This macro is always invoked as a statement.  It assumes a variable
   `temp'.  */
   
#define SWAP(x, y) temp = (x); (x) = (y); (y) = temp


/* Make the NITEMS items pointed at by P, each of size SIZE, be the
   opposite-endianness of whatever they are now.  */

static void
swap_items (char *p, int nitems, int size)
{
  char temp;

  /* Since `size' does not change, we can write a while loop for each
     case, and avoid testing `size' for each time.  */
  switch (size)
    {
    /* 16-byte items happen on the DEC Alpha machine when we are not
       doing sharable memory dumps.  */
    case 16:
      while (nitems--)
        {
          SWAP (p[0], p[15]);
          SWAP (p[1], p[14]);
          SWAP (p[2], p[13]);
          SWAP (p[3], p[12]);
          SWAP (p[4], p[11]);
          SWAP (p[5], p[10]);
          SWAP (p[6], p[9]);
          SWAP (p[7], p[8]);
          p += size;
        }
      break;

    case 8:
      while (nitems--)
        {
          SWAP (p[0], p[7]);
          SWAP (p[1], p[6]);
          SWAP (p[2], p[5]);
          SWAP (p[3], p[4]);
          p += size;
        }
      break;

    case 4:
      while (nitems--)
        {
          SWAP (p[0], p[3]);
          SWAP (p[1], p[2]);
          p += size;
        }
      break;

    case 2:
      while (nitems--)
        {
          SWAP (p[0], p[1]);
          p += size;
        }
      break;

    case 1:
      /* Nothing to do.  */
      break;

    default:
      FATAL1 ("Can't swap a %d-byte item for (un)dumping", size);
  }
}
#endif /* not WORDS_BIGENDIAN and not NO_DUMP_SHARE */


/* Here we write NITEMS items, each item being ITEM_SIZE bytes long.
   The pointer to the stuff to write is P, and we write to the file
   OUT_FILE.  */

void
#ifdef XeTeX
do_dump (char *p, int item_size, int nitems,  gzFile out_file)
#else
do_dump (char *p, int item_size, int nitems,  FILE *out_file)
#endif
{
#if !defined (WORDS_BIGENDIAN) && !defined (NO_DUMP_SHARE)
  swap_items (p, nitems, item_size);
#endif

#ifdef XeTeX
  if (gzwrite (out_file, p, item_size * nitems) != item_size * nitems)
#else
  if (fwrite (p, item_size, nitems, out_file) != nitems)
#endif
    {
      fprintf (stderr, "! Could not write %d %d-byte item(s) to %s.\n",
               nitems, item_size, nameoffile+1);
      uexit (1);
    }

  /* Have to restore the old contents of memory, since some of it might
     get used again.  */
#if !defined (WORDS_BIGENDIAN) && !defined (NO_DUMP_SHARE)
  swap_items (p, nitems, item_size);
#endif
}


/* Here is the dual of the writing routine.  */

void
#ifdef XeTeX
do_undump (char *p, int item_size, int nitems, gzFile in_file)
#else
do_undump (char *p, int item_size, int nitems, FILE *in_file)
#endif
{
#ifdef XeTeX
  if (gzread (in_file, p, item_size * nitems) != item_size * nitems)
#else
  if (fread (p, item_size, nitems, in_file) != (size_t) nitems)
#endif
    FATAL3 ("Could not undump %d %d-byte item(s) from %s",
            nitems, item_size, nameoffile+1);

#if !defined (WORDS_BIGENDIAN) && !defined (NO_DUMP_SHARE)
  swap_items (p, nitems, item_size);
#endif
}

/* FIXME -- some (most?) of this can/should be moved to the Pascal/WEB side. */
#if defined(TeX) || defined(MF)
#if !defined(pdfTeX)
static void
checkpoolpointer (poolpointer poolptr, size_t len)
{
  if (poolptr + len >= poolsize) {
    fprintf (stderr, "\nstring pool overflow [%i bytes]\n", 
            (int)poolsize); /* fixme */
    exit(1);
  }
}

#ifndef XeTeX	/* XeTeX uses this from XeTeX_ext.c */
static
#endif
int
maketexstring(const_string s)
{
  size_t len;
#ifdef XeTeX
  UInt32 rval;
  const unsigned char *cp = (const unsigned char *)s;
#endif
  assert (s != 0);
  len = strlen(s);
  checkpoolpointer (poolptr, len); /* in the XeTeX case, this may be more than enough */
#ifdef XeTeX
  while ((rval = *(cp++)) != 0) {
    UInt16 extraBytes = bytesFromUTF8[rval];
    switch (extraBytes) { /* note: code falls through cases! */
      case 5: rval <<= 6; if (*cp) rval += *(cp++);
      case 4: rval <<= 6; if (*cp) rval += *(cp++);
      case 3: rval <<= 6; if (*cp) rval += *(cp++);
      case 2: rval <<= 6; if (*cp) rval += *(cp++);
      case 1: rval <<= 6; if (*cp) rval += *(cp++);
      case 0: ;
    };
    rval -= offsetsFromUTF8[extraBytes];
    if (rval > 0xffff) {
      rval -= 0x10000;
      strpool[poolptr++] = 0xd800 + rval / 0x0400;
      strpool[poolptr++] = 0xdc00 + rval % 0x0400;
    }
    else
      strpool[poolptr++] = rval;
  }
#else /* ! XeTeX */
  while (len-- > 0)
    strpool[poolptr++] = *s++;
#endif /* ! XeTeX */

  return makestring();
}
#endif /* !pdfTeX */

strnumber
makefullnamestring(void)
{
  return maketexstring(fullnameoffile);
}

/* Get the job name to be used, which may have been set from the
   command line. */
strnumber
getjobname(strnumber name)
{
    strnumber ret = name;
    if (c_job_name != NULL)
      ret = maketexstring(c_job_name);
    return ret;
}
#endif

#if defined(TeX)
static int
compare_paths (const_string p1, const_string p2)
{
  int ret;
  while (
#ifdef MONOCASE_FILENAMES
                (((ret = (toupper(*p1) - toupper(*p2))) == 0) && (*p2 != 0))
#else
         (((ret = (*p1 - *p2)) == 0) && (*p2 != 0))
#endif
                || (IS_DIR_SEP(*p1) && IS_DIR_SEP(*p2))) {
       p1++, p2++;
  }
  ret = (ret < 0 ? -1 : (ret > 0 ? 1 : 0));
  return ret;
}

#ifdef XeTeX /* the string pool is UTF-16 but we want a UTF-8 string */

string
gettexstring (strnumber s)
{
  unsigned bytesToWrite = 0;
  poolpointer len, i, j;
  string name;
  len = strstart[s + 1 - 65536L] - strstart[s - 65536L];
  name = xmalloc(len * 3 + 1); /* max UTF16->UTF8 expansion
                                  (code units, not bytes) */
  for (i = 0, j = 0; i < len; i++) {
    unsigned c = strpool[i + strstart[s - 65536L]];
    if (c >= 0xD800 && c <= 0xDBFF) {
      unsigned lo = strpool[++i + strstart[s - 65536L]];
      if (lo >= 0xDC00 && lo <= 0xDFFF)
        c = (c - 0xD800) * 0x0400 + lo - 0xDC00;
      else
        c = 0xFFFD;
    }
    if (c < 0x80)
      bytesToWrite = 1;
    else if (c < 0x800)
      bytesToWrite = 2;
    else if (c < 0x10000)
      bytesToWrite = 3;
    else if (c < 0x110000)
      bytesToWrite = 4;
    else {
      bytesToWrite = 3;
      c = 0xFFFD;
    }

    j += bytesToWrite;
    switch (bytesToWrite) { /* note: everything falls through. */
      case 4: name[--j] = ((c | 0x80) & 0xBF); c >>= 6;
      case 3: name[--j] = ((c | 0x80) & 0xBF); c >>= 6;
      case 2: name[--j] = ((c | 0x80) & 0xBF); c >>= 6;
      case 1: name[--j] =  (c | firstByteMark[bytesToWrite]);
    }
    j += bytesToWrite;
  }
  name[j] = 0;
  return name;
}

#else

string
gettexstring (strnumber s)
{
  poolpointer len;
  string name;
#if !defined(Aleph)
  len = strstart[s + 1] - strstart[s];
#else
  len = strstartar[s + 1 - 65536L] - strstartar[s - 65536L];
#endif
  name = (string)xmalloc (len + 1);
#if !defined(Aleph)
  strncpy (name, (string)&strpool[strstart[s]], len);
#else
  {
  poolpointer i;
  /* Don't use strncpy.  The strpool is not made up of chars. */
  for (i=0; i<len; i++) name[i] =  strpool[i+strstartar[s - 65536L]];
  }
#endif
  name[len] = 0;
  return name;
}

#endif /* not XeTeX */

boolean
isnewsource (strnumber srcfilename, int lineno)
{
  char *name = gettexstring(srcfilename);
  return (compare_paths(name, last_source_name) != 0 || lineno != last_lineno);
}

void
remembersourceinfo (strnumber srcfilename, int lineno)
{
  if (last_source_name)
       free(last_source_name);
  last_source_name = gettexstring(srcfilename);
  last_lineno = lineno;
}

poolpointer
makesrcspecial (strnumber srcfilename, int lineno)
{
  poolpointer oldpoolptr = poolptr;
  char *filename = gettexstring(srcfilename);
  /* FIXME: Magic number. */
  char buf[40];
  char *s = buf;

  /* Always put a space after the number, which makes things easier
   * to parse.
   */
  sprintf (buf, "src:%d ", lineno);

  if (poolptr + strlen(buf) + strlen(filename) >= (size_t)poolsize) {
       fprintf (stderr, "\nstring pool overflow\n"); /* fixme */
       exit (1);
  }
  s = buf;
  while (*s)
    strpool[poolptr++] = *s++;

  s = filename;
  while (*s)
    strpool[poolptr++] = *s++;

  return (oldpoolptr);
}
#endif

/* Metafont/MetaPost fraction routines. Replaced either by assembler or C.
   The assembler syntax doesn't work on Solaris/x86.  */
#ifndef TeX
#if defined (__sun__) || defined (__cplusplus)
#define NO_MF_ASM
#endif
/* The assembler code is not PIC safe on i?86 so use C code.  */
#if defined (__PIC__) && defined (__i386__)
#define NO_MF_ASM
#endif
#if defined(WIN32) && !defined(NO_MF_ASM) && !defined(__MINGW32__)
#include "lib/mfmpw32.c"
#elif defined (__i386__) && defined (__GNUC__) && !defined (NO_MF_ASM)
#include "lib/mfmpi386.asm"
#else
/* Replace fixed-point fraction routines from mf.web and mp.web with
   Hobby's floating-point C code.  */

/****************************************************************
Copyright 1990 - 1995 by AT&T Bell Laboratories.

Permission to use, copy, modify, and distribute this software
and its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the names of AT&T Bell Laboratories or
any of its entities not be used in advertising or publicity
pertaining to distribution of the software without specific,
written prior permission.

AT&T disclaims all warranties with regard to this software,
including all implied warranties of merchantability and fitness.
In no event shall AT&T be liable for any special, indirect or
consequential damages or any damages whatsoever resulting from
loss of use, data or profits, whether in an action of contract,
negligence or other tortious action, arising out of or in
connection with the use or performance of this software.
****************************************************************/

/**********************************************************
 The following is by John Hobby
 **********************************************************/

#ifndef FIXPT

/* These replacements for takefraction, makefraction, takescaled, makescaled
   run about 3 to 11 times faster than the standard versions on modern machines
   that have fast hardware for double-precision floating point.  They should
   produce approximately correct results on all machines and agree exactly
   with the standard versions on machines that satisfy the following conditions:
   1. Doubles must have at least 46 mantissa bits; i.e., numbers expressible
      as n*2^k with abs(n)<2^46 should be representable.
   2. The following should hold for addition, subtraction, and multiplcation but
      not necessarily for division:
      A. If the true answer is between two representable numbers, the computed
         answer must be one of them.
      B. When the true answer is representable, this must be the computed result.
   3. Dividing one double by another should always produce a relative error of
      at most one part in 2^46.  (This is why the mantissa requirement is
      46 bits instead of 45 bits.)
   3. In the absence of overflow, double-to-integer conversion should truncate
      toward zero and do this in an exact fashion.
   4. Integer-to-double convesion should produce exact results.
   5. Dividing one power of two by another should yield an exact result.
   6. ASCII to double conversion should be exact for integer values.
   7. Integer arithmetic must be done in the two's-complement system.
*/
#define ELGORDO  0x7fffffff
#define TWEXP31  2147483648.0
#define TWEXP28  268435456.0
#define TWEXP16 65536.0
#define TWEXP_16 (1.0/65536.0)
#define TWEXP_28 (1.0/268435456.0)

integer
ztakefraction (integer p, integer q)     /* Approximate p*q/2^28 */
{	register double d;
	register integer i;
	d = (double)p * (double)q * TWEXP_28;
	if ((p^q) >= 0) {
		d += 0.5;
		if (d>=TWEXP31) {
			if (d!=TWEXP31 || (((p&077777)*(q&077777))&040000)==0)
				aritherror = true;
			return ELGORDO;
		}
		i = (integer) d;
		if (d==i && (((p&077777)*(q&077777))&040000)!=0) --i;
	} else {
		d -= 0.5;
		if (d<= -TWEXP31) {
			if (d!= -TWEXP31 || ((-(p&077777)*(q&077777))&040000)==0)
				aritherror = true;
			return -ELGORDO;
		}
		i = (integer) d;
		if (d==i && ((-(p&077777)*(q&077777))&040000)!=0) ++i;
	}
	return i;
}

integer
ztakescaled (integer p, integer q)		/* Approximate p*q/2^16 */
{	register double d;
	register integer i;
	d = (double)p * (double)q * TWEXP_16;
	if ((p^q) >= 0) {
		d += 0.5;
		if (d>=TWEXP31) {
			if (d!=TWEXP31 || (((p&077777)*(q&077777))&040000)==0)
				aritherror = true;
			return ELGORDO;
		}
		i = (integer) d;
		if (d==i && (((p&077777)*(q&077777))&040000)!=0) --i;
	} else {
		d -= 0.5;
		if (d<= -TWEXP31) {
			if (d!= -TWEXP31 || ((-(p&077777)*(q&077777))&040000)==0)
				aritherror = true;
			return -ELGORDO;
		}
		i = (integer) d;
		if (d==i && ((-(p&077777)*(q&077777))&040000)!=0) ++i;
	}
	return i;
}

/* Note that d cannot exactly equal TWEXP31 when the overflow test is made
   because the exact value of p/q cannot be strictly between (2^31-1)/2^28
   and 8/1.  No pair of integers less than 2^31 has such a ratio.
*/
integer
zmakefraction (integer p, integer q)	/* Approximate 2^28*p/q */
{	register double d;
	register integer i;
#ifdef DEBUG
	if (q==0) confusion(47); 
#endif /* DEBUG */
	d = TWEXP28 * (double)p /(double)q;
	if ((p^q) >= 0) {
		d += 0.5;
		if (d>=TWEXP31) {aritherror=true; return ELGORDO;}
		i = (integer) d;
		if (d==i && ( ((q>0 ? -q : q)&077777)
				* (((i&037777)<<1)-1) & 04000)!=0) --i;
	} else {
		d -= 0.5;
		if (d<= -TWEXP31) {aritherror=true; return -ELGORDO;}
		i = (integer) d;
		if (d==i && ( ((q>0 ? q : -q)&077777)
				* (((i&037777)<<1)+1) & 04000)!=0) ++i;
	}
	return i;
}

/* Note that d cannot exactly equal TWEXP31 when the overflow test is made
   because the exact value of p/q cannot be strictly between (2^31-1)/2^16
   and 2^15/1.  No pair of integers less than 2^31 has such a ratio.
*/
integer
zmakescaled (integer p, integer q)		/* Approximate 2^16*p/q */
{	register double d;
	register integer i;
#ifdef DEBUG
	if (q==0) confusion(47); 
#endif /* DEBUG */
	d = TWEXP16 * (double)p /(double)q;
	if ((p^q) >= 0) {
		d += 0.5;
		if (d>=TWEXP31) {aritherror=true; return ELGORDO;}
		i = (integer) d;
		if (d==i && ( ((q>0 ? -q : q)&077777)
				* (((i&037777)<<1)-1) & 04000)!=0) --i;
	} else {
		d -= 0.5;
		if (d<= -TWEXP31) {aritherror=true; return -ELGORDO;}
		i = (integer) d;
		if (d==i && ( ((q>0 ? q : -q)&077777)
				* (((i&037777)<<1)+1) & 04000)!=0) ++i;
	}
	return i;
}

#endif /* not FIXPT */
#endif /* not assembler */
#endif /* not TeX, i.e., MF */

#ifdef MF
/* On-line display routines for Metafont.  Here we use a dispatch table
   indexed by the MFTERM or TERM environment variable to select the
   graphics routines appropriate to the user's terminal.  stdout must be
   connected to a terminal for us to do any graphics.  */

#ifdef MFNOWIN
#undef AMIGAWIN
#undef EPSFWIN
#undef HP2627WIN
#undef MFTALKWIN
#undef NEXTWIN
#undef REGISWIN
#undef SUNWIN
#undef TEKTRONIXWIN
#undef UNITERMWIN
#undef WIN32WIN
#undef X11WIN
#endif

/* Prototypes for Metafont display routines: mf_XXX_initscreen,
   mf_XXX_updatescreen, mf_XXX_blankrectangle, and mf_XXX_paintrow.  */
#include <window/mfdisplay.h>

/* This variable, `mfwsw', contains the dispatch tables for each
   terminal.  We map the Pascal calls to the routines `init_screen',
   `update_screen', `blank_rectangle', and `paint_row' into the
   appropriate entry point for the specific terminal that MF is being
   run on.  */

struct mfwin_sw
{
  const char *mfwsw_type;	/* Name of terminal a la TERMCAP.  */
  int (*mfwsw_initscreen) (void);
  void (*mfwsw_updatescrn) (void);
  void (*mfwsw_blankrect) (screencol, screencol, screenrow, screenrow);
  void (*mfwsw_paintrow) (screenrow, pixelcolor, transspec, screencol);
} mfwsw[] =
{
#ifdef AMIGAWIN
  { "amiterm", mf_amiga_initscreen, mf_amiga_updatescreen,
    mf_amiga_blankrectangle, mf_amiga_paintrow },
#endif
#ifdef EPSFWIN
  { "epsf", mf_epsf_initscreen, mf_epsf_updatescreen, 
    mf_epsf_blankrectangle, mf_epsf_paintrow },
#endif
#ifdef HP2627WIN
  { "hp2627", mf_hp2627_initscreen, mf_hp2627_updatescreen,
    mf_hp2627_blankrectangle, mf_hp2627_paintrow },
#endif
#ifdef MFTALKWIN
  { "mftalk", mf_mftalk_initscreen, mf_mftalk_updatescreen, 
     mf_mftalk_blankrectangle, mf_mftalk_paintrow },
#endif
#ifdef NEXTWIN
  { "next", mf_next_initscreen, mf_next_updatescreen,
    mf_next_blankrectangle, mf_next_paintrow },
#endif
#ifdef REGISWIN
  { "regis", mf_regis_initscreen, mf_regis_updatescreen,
    mf_regis_blankrectangle, mf_regis_paintrow },
#endif
#ifdef SUNWIN
  { "sun", mf_sun_initscreen, mf_sun_updatescreen,
    mf_sun_blankrectangle, mf_sun_paintrow },
#endif
#ifdef TEKTRONIXWIN
  { "tek", mf_tektronix_initscreen, mf_tektronix_updatescreen,
    mf_tektronix_blankrectangle, mf_tektronix_paintrow },
#endif
#ifdef UNITERMWIN
   { "uniterm", mf_uniterm_initscreen, mf_uniterm_updatescreen,
     mf_uniterm_blankrectangle, mf_uniterm_paintrow },
#endif
#ifdef WIN32WIN
  { "win32term", mf_win32_initscreen, mf_win32_updatescreen, 
    mf_win32_blankrectangle, mf_win32_paintrow },
#endif
#ifdef X11WIN
  { "xterm", mf_x11_initscreen, mf_x11_updatescreen, 
    mf_x11_blankrectangle, mf_x11_paintrow },
#endif
  
  /* Always support this.  */
  { "trap", mf_trap_initscreen, mf_trap_updatescreen,
    mf_trap_blankrectangle, mf_trap_paintrow },

/* Finally, we must have an entry with a terminal type of NULL.  */
  { NULL, NULL, NULL, NULL, NULL }

}; /* End of the array initialization.  */


/* This is a pointer to the mfwsw[] entry that we find.  */
static struct mfwin_sw *mfwp;


/* The following are routines that just jump to the correct
   terminal-specific graphics code. If none of the routines in the
   dispatch table exist, or they fail, we produce trap-compatible
   output, i.e., the same words and punctuation that the unchanged
   mf.web would produce.  */


/* This returns true if we can do window operations, else false.  */

boolean
initscreen (void)
{
  int retval;
  /* If MFTERM is set, use it.  */
  const_string tty_type = kpse_var_value ("MFTERM");
  
  if (tty_type == NULL)
    { 
#if defined (AMIGA)
      tty_type = "amiterm";
#elif defined (WIN32)
      tty_type = "win32term";
#elif defined (OS2) || defined (__DJGPP__) /* not AMIGA nor WIN32 */
      tty_type = "mftalk";
#else /* not (OS2 or WIN32 or __DJGPP__ or AMIGA) */
      /* If DISPLAY is set, we are X11; otherwise, who knows.  */
      boolean have_display = getenv ("DISPLAY") != NULL;
      tty_type = have_display ? "xterm" : getenv ("TERM");

      /* If we don't know what kind of terminal this is, or if Metafont
         isn't being run interactively, don't do any online output.  */
      if (tty_type == NULL
          || (!STREQ (tty_type, "trap") && !isatty (fileno (stdout))))
        return 0;
#endif /* not (OS2 or WIN32 or __DJGPP__ or AMIGA) */
  }

  /* Test each of the terminals given in `mfwsw' against the terminal
     type, and take the first one that matches, or if the user is running
     under Emacs, the first one.  */
  for (mfwp = mfwsw; mfwp->mfwsw_type != NULL; mfwp++) {
    if (!strncmp (mfwp->mfwsw_type, tty_type, strlen (mfwp->mfwsw_type))
	|| STREQ (tty_type, "emacs")) {
      if (mfwp->mfwsw_initscreen) {
	retval = (*mfwp->mfwsw_initscreen) ();
#ifdef WIN32
	Sleep(1000); /* Wait for opening a window */
#endif
	return retval;
      }
      else {
        fprintf (stderr, "mf: Couldn't initialize online display for `%s'.\n",
                 tty_type);
        break;
      }
    }
  }
  
  /* The current terminal type wasn't found in any of the entries, or
     initalization failed, so silently give up, assuming that the user
     isn't on a terminal that supports graphic output.  */
  return 0;
}


/* Make sure everything is visible.  */

void
updatescreen (void)
{
  if (mfwp->mfwsw_updatescrn)
    (*mfwp->mfwsw_updatescrn) ();
}


/* This sets the rectangle bounded by ([left,right], [top,bottom]) to
   the background color.  */

void
blankrectangle (screencol left, screencol right,
                screenrow top, screenrow bottom)
{
  if (mfwp->mfwsw_blankrect)
    (*mfwp->mfwsw_blankrect) (left, right, top, bottom);
}


/* This paints ROW, starting with the color INIT_COLOR. 
   TRANSITION_VECTOR then specifies the length of the run; then we
   switch colors.  This goes on for VECTOR_SIZE transitions.  */

void
paintrow (screenrow row, pixelcolor init_color,
          transspec transition_vector, screencol vector_size)
{
  if (mfwp->mfwsw_paintrow)
    (*mfwp->mfwsw_paintrow) (row, init_color, transition_vector, vector_size);
}
#endif /* MF */