summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/luatexdir/lua/loslibext.c
blob: e79e3a52a98041935e1521a0e648e9c661e88422 (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
/* $Id: loslibext.c 1066 2008-02-23 10:52:51Z taco $ */

#include "luatex-api.h"
#include <ptexlib.h>

#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>

/* An attempt to figure out the basic platform, does not
  care about niceties like version numbers yet,
  and ignores platforms where luatex is unlikely to 
  successfully compile without major prorting effort 
  (amiga|mac|os2|vms) */

#if defined(_WIN32) || defined(WIN32) || defined(__NT__)
#define OS_PLATTYPE "windows"
#define OS_PLATNAME "windows"
#elif defined(__GO32__) || defined(__DJGPP__) || defined(__DOS__) 
#define OS_PLATTYPE "msdos"
#define OS_PLATNAME "msdos"
#else  /* assume everything else is unix-y */
#define OS_PLATTYPE "unix"
/* this is just a first guess */
#if defined(__BSD__) 
  #define OS_PLATNAME "bsd"
#elif defined(__SYSV__) 
  #define OS_PLATNAME "sysv"
#else
  #define OS_PLATNAME "generic"
#endif
/* attempt to be more precise */
#if defined(__LINUX__) || defined (__linux)
  #undef OS_PLATNAME
  #define OS_PLATNAME "linux"
#elif defined(__FREEBSD__) || defined(__FreeBSD)
  #undef OS_PLATNAME
  #define OS_PLATNAME "freebsd"
#elif defined(__OPENBSD__)  || defined(__OpenBSD)
  #undef OS_PLATNAME
  #define OS_PLATNAME "openbsd"
#elif defined(__SOLARIS__)
  #undef OS_PLATNAME
  #define OS_PLATNAME "solaris"
#elif defined(__SUNOS__) ||  defined(__SUN__) ||  defined(sun)
  #undef OS_PLATNAME
  #define OS_PLATNAME "sunos"
#elif defined(HPUX) || defined(__hpux)
  #undef OS_PLATNAME
  #define OS_PLATNAME "hpux"
#elif defined(__sgi)
  #undef OS_PLATNAME
  #define OS_PLATNAME "irix"
#elif defined(__MACH__) && defined(__APPLE__)
  #undef OS_PLATNAME
  #define OS_PLATNAME "macosx"
#endif 
#endif





/* there could be more platforms that don't have these two,
 *  but win32 and sunos are for sure.
 * gettimeofday() for win32 is using an alternative definition
 */

#if (! defined(WIN32)) && (! defined(__SUNOS__))
#include <sys/time.h>   /* gettimeofday() */
#include <sys/times.h>  /* times() */
#include <sys/wait.h>
#endif 

/* set this to one for spawn instead of exec on windows */

#define DONT_REALLY_EXIT 1

#ifdef WIN32
#include <process.h>
#define spawn_command(a,b,c) _spawnvpe(_P_WAIT,(const char *)a,(const char* const*)b,(const char* const*)c)
#if DONT_REALLY_EXIT
#define exec_command(a,b,c) exit(spawn_command((a),(b),(c)))
#else
#define exec_command(a,b,c) _execvpe((const char *)a,(const char* const*)b,(const char* const*)c)
#endif
#else
#include <unistd.h>
#define DEFAULT_PATH 	"/bin:/usr/bin:."

static int 
exec_command(const char *file, char *const *argv, char *const *envp)
{
	char path[PATH_MAX];
	const char *searchpath, *esp;
	size_t prefixlen, filelen, totallen;

	if (strchr(file, '/'))	/* Specific path */
		return execve(file, argv, envp);

	filelen = strlen(file);

	searchpath = getenv("PATH");
	if (!searchpath)
		searchpath = DEFAULT_PATH;

	errno = ENOENT;		/* Default errno, if execve() doesn't  change it */

	do {
		esp = strchr(searchpath, ':');
		if (esp)
			prefixlen = esp - searchpath;
		else
			prefixlen = strlen(searchpath);

		if (prefixlen == 0 || searchpath[prefixlen - 1] == '/') {
			totallen = prefixlen + filelen;
			if (totallen >= PATH_MAX)
				continue;
			memcpy(path, searchpath, prefixlen);
			memcpy(path + prefixlen, file, filelen);
		} else {
			totallen = prefixlen + filelen + 1;
			if (totallen >= PATH_MAX)
				continue;
			memcpy(path, searchpath, prefixlen);
			path[prefixlen] = '/';
			memcpy(path + prefixlen + 1, file, filelen);
		}
		path[totallen] = '\0';

		execve(path, argv, envp);
		if (errno == E2BIG  || errno == ENOEXEC ||
		    errno == ENOMEM || errno == ETXTBSY)
			break;	/* Report this as an error, no more search */

		searchpath = esp + 1;
	} while (esp);

	return -1;
}

/* 
   It is not possible to mimic |spawnve()| completely. The main problem is
   that the |fork|--|waitpid| combination cannot really do identical error 
   reporting to the parent process, because it has to pass all the possible
   error conditions as well as the actual process return status through a 
   single 8-bit value.

   The current implementation tries to give back meaningful results for |execve()|
   errors in the child, for the cases that could also be returned by |spawnve()|,
   and for |ETXTBSY|, because that can be triggered by our path searching routine.

   This implementation does not differentiate abnormal status conditions reported 
   by |waitpid()|, but will simply return a single error indication value.

   For all this, hyjacking a bunch of numbers in the range 1...255 is needed. 
   The chance of collisions is hopefully diminished by using a rather random
   range in the 8-bit section.
*/

#define INVALID_RET_E2BIG   143 
#define INVALID_RET_ENOENT  144
#define INVALID_RET_ENOEXEC 145
#define INVALID_RET_ENOMEM  146
#define INVALID_RET_ETXTBSY 147
#define INVALID_RET_UNKNOWN 148
#define INVALID_RET_INTR    149

static int 
spawn_command(const char *file, char *const *argv, char *const *envp)
{
  pid_t pid, wait_pid;
  int status;
  pid = fork();
  if (pid<0) {
    return -1; /* fork failed */
  }
  if (pid>0) { /* parent */
    status = 0;
    wait_pid = waitpid (pid, &status,0);
    if (wait_pid == pid) {
      if (WIFEXITED(status))
	return WEXITSTATUS(status);
      else
	return INVALID_RET_INTR;
    } else {
      return -1; /* some waitpid error */
    }
  } else {
    int f;
    /* somewhat random upper limit. ignore errors on purpose */
    for (f = 0; f<256; f++) 
      (void)fsync(f);

    if (exec_command(file, argv, envp)) {
      /* let's hope no-one uses these values  */
      switch (errno) {
      case E2BIG:    exit(INVALID_RET_E2BIG);
      case ETXTBSY:  exit(INVALID_RET_ETXTBSY);
      case ENOENT:   exit(INVALID_RET_ENOENT);
      case ENOEXEC:  exit(INVALID_RET_ENOEXEC);
      case ENOMEM:   exit(INVALID_RET_ENOMEM);
      default:       exit(INVALID_RET_UNKNOWN);
      }
      return -1;
    }
  }
}

#endif

extern char **environ;

static char **
do_split_command(char *maincmd)
{
    char *piece, *start_piece;
    char *cmd;
    char **cmdline = NULL;
    unsigned int i, j;
    int ret = 0;
    int in_string = 0;
    int quoted = 0;
    if (strlen(maincmd) == 0)
	return NULL;
    /* allocate the array of options first. it will probably be 
       be a little bit too big, but better too much than to little */
    j=2;
    for (i = 0; i < strlen(maincmd); i++) { if (maincmd[i]==' ') j++; }
    cmdline = malloc(sizeof(char *) * j);
    for (i = 0; i < j; i++) { cmdline[i] = NULL; }
    cmd = maincmd;
    i = 0;
    while (cmd[i] == ' ') i++; /* skip leading spaces */
    start_piece = malloc(strlen(cmd)+1); /* a buffer */
    piece = start_piece;
    for (; i <= strlen(maincmd); i++) {
      if (cmd[i]=='\\' && 
	  (cmd[i+1] == '\\' || cmd[i+1] == '\'' || cmd[i+1] == '"')) {
	quoted =1;
	continue;
      }
      if (in_string && cmd[i] == in_string  && !quoted) { 
	in_string = 0; 
	continue; 
      } 
      if ((cmd[i] == '"' || cmd[i] == '\'')&& !quoted) { 
	in_string = cmd[i]; 
	continue; 
      } 
      if ((in_string==0 && cmd[i] == ' ') || cmd[i]==0) {
	*piece = 0; 
	cmdline[ret++] = xstrdup(start_piece);
	piece = start_piece;
	while (i < strlen(maincmd) && cmd[(i + 1)] == ' ')
	  i++;
	continue;
      }
      *piece++ = cmd[i];
      quoted=0;
    }
    xfree(start_piece);
    return cmdline;
}

static char **
do_flatten_command(lua_State *L, char **runcmd) {
   unsigned int i, j ;
   char *s;
   char **cmdline = NULL;
   *runcmd = NULL;

   for (j = 1;;j++) {
     lua_rawgeti(L,-1,j);
     if (lua_isnil(L,-1)) {
       lua_pop(L,1);
       break;
     }
     lua_pop(L,1);
   }
   if (j == 1)
     return NULL;
   cmdline = malloc(sizeof(char *) * (j+1));
   for (i = 1; i <= j; i++) {
     cmdline[i] = NULL;
     lua_rawgeti(L,-1,i);
     if (lua_isnil(L,-1) || (s=(char *)lua_tostring(L,-1))==NULL) {
       lua_pop(L,1);
       if (i==1) {
		 xfree(cmdline) ;
         return NULL;
       } else {
         break;
       }
     } else {
       lua_pop(L,1);
       cmdline[(i-1)] = xstrdup(s);
     }
   }
   cmdline[i] = NULL;

   lua_rawgeti(L,-1,0);
   if (lua_isnil(L,-1) || (s=(char *)lua_tostring(L,-1))==NULL) {
	 *runcmd = cmdline[0];
   } else {
	 *runcmd = xstrdup(s);
   }
   lua_pop(L,1);

   return cmdline;
}


static int os_exec (lua_State *L) {
  char * maincmd, * runcmd;
  char ** cmdline = NULL;

  if (lua_gettop(L)!=1) {
    lua_pushnil(L);
    lua_pushliteral(L,"invalid arguments passed");
    return 2;
  }
  if (lua_type(L,1)==LUA_TSTRING) {
    maincmd =  (char *)lua_tostring(L, 1);
    cmdline = do_split_command(maincmd);
    runcmd = cmdline[0];
  } else if (lua_type(L,1)==LUA_TTABLE) {
    cmdline = do_flatten_command(L, & runcmd);
  }
  if (cmdline!=NULL) {
#if defined(WIN32) && DONT_REALLY_EXIT
    exec_command(runcmd, cmdline, environ);
#else
    if (exec_command(runcmd, cmdline, environ)==-1) {
      lua_pushnil(L);
      lua_pushfstring(L,"%s: %s",runcmd,  strerror(errno));
      lua_pushnumber(L, errno);
      return 3;
    }
#endif
  }
  lua_pushnil(L);
  lua_pushliteral(L,"invalid command line passed");
  return 2;
}

#define do_error_return(A,B) do {					\
    lua_pushnil(L);									\
    lua_pushfstring(L,"%s: %s",runcmd,(A));			\
    lua_pushnumber(L, B);							\
    return 3;										\
  } while (0)

static int os_spawn (lua_State *L) {
  char * maincmd, * runcmd;
  char ** cmdline = NULL;
  int i;

  if (lua_gettop(L)!=1) {
    lua_pushnil(L);
    lua_pushliteral(L,"invalid arguments passed");
    return 2;
  }
  if (lua_type(L,1)==LUA_TSTRING) {
    maincmd =  (char *)lua_tostring(L, 1);
    cmdline = do_split_command(maincmd);
    runcmd = cmdline[0];
  } else if (lua_type(L,1)==LUA_TTABLE) {
    cmdline = do_flatten_command(L, &runcmd);
  }
  if (cmdline!=NULL) {
    i = spawn_command(runcmd, cmdline, environ);
    if (i==0) {
      lua_pushnumber(L, i);
      return 1;
    } else if (i==-1)                  { 
      /* this branch covers WIN32 as well as fork() and waitpid() errors */
      do_error_return(strerror(errno),errno);
#ifndef WIN32
    } else if (i==INVALID_RET_E2BIG)   { do_error_return(strerror(E2BIG),i);
    } else if (i==INVALID_RET_ENOENT)  { do_error_return(strerror(ENOENT),i);
    } else if (i==INVALID_RET_ENOEXEC) { do_error_return(strerror(ENOEXEC),i);
    } else if (i==INVALID_RET_ENOMEM)  { do_error_return(strerror(ENOMEM),i);
    } else if (i==INVALID_RET_ETXTBSY) { do_error_return(strerror(ETXTBSY),i);
    } else if (i==INVALID_RET_UNKNOWN) { do_error_return("execution failed",i);
    } else if (i==INVALID_RET_INTR)    { do_error_return("execution interrupted",i);
#endif
    } else {
      lua_pushnumber(L, i);
      return 1;
    }
  } 
  lua_pushnil(L);
  lua_pushliteral(L,"invalid command line passed");
  return 2;
}

/*  Hans wants to set env values */

static int os_setenv (lua_State *L) {
  char *value, *key, *val;
  key =  (char *)luaL_optstring(L, 1, NULL);
  val =  (char *)luaL_optstring(L, 2, NULL);
  if (key) {
	if (val) {
	  value = xmalloc(strlen(key)+strlen(val)+2);
	  sprintf(value,"%s=%s",key,val);
	  if (putenv(value)) {
		return luaL_error(L, "unable to change environment");
	  }
	} else {
#if defined(WIN32) || defined(__sun__) || defined(__sun) || defined(_AIX)
	  value = xmalloc(strlen(key)+2);
	  sprintf(value,"%s=",key);
	  if (putenv(value)) {
		return luaL_error(L, "unable to change environment");
	  } 
#else
	  (void)unsetenv(key);
#endif 
	}
  }
  lua_pushboolean (L, 1);
  return 1;
}


void find_env (lua_State *L){
  char *envitem, *envitem_orig;
  char *envkey;
  char **envpointer;
  envpointer = environ;
  lua_getglobal(L,"os");
  if (envpointer!=NULL && lua_istable(L,-1)) {
    luaL_checkstack(L,2,"out of stack space");
    lua_pushstring(L,"env"); 
    lua_newtable(L); 
    while (*envpointer) {
      /* TODO: perhaps a memory leak here  */
      luaL_checkstack(L,2,"out of stack space");
      envitem = xstrdup(*envpointer);
      envitem_orig = envitem;
      envkey=envitem;
      while (*envitem != '=') {
		envitem++;
      }
      *envitem=0;
      envitem++;
      lua_pushstring(L,envkey);
      lua_pushstring(L,envitem);
      lua_rawset(L,-3);
      envpointer++;
      free(envitem_orig);
    }
    lua_rawset(L,-3);
  }
  lua_pop(L,1);
}

static int ex_sleep(lua_State *L)
{
  lua_Number interval = luaL_checknumber(L, 1);
  lua_Number units = luaL_optnumber(L, 2, 1);
#ifdef WIN32
  Sleep(1e3 * interval / units);
#else /* assumes posix or bsd */
  usleep(1e6 * interval / units);
#endif
  return 0;
}

#if (! defined (WIN32))  && (! defined (__SUNOS__))
static int os_times (lua_State *L) {
  struct tms r;
  (void)times(&r);
  lua_newtable(L);
  lua_pushnumber(L, ((lua_Number)(r.tms_utime))/(lua_Number)sysconf(_SC_CLK_TCK));
  lua_setfield(L,-2,"utime");
  lua_pushnumber(L, ((lua_Number)(r.tms_stime))/(lua_Number)sysconf(_SC_CLK_TCK));
  lua_setfield(L,-2,"stime");
  lua_pushnumber(L, ((lua_Number)(r.tms_cutime))/(lua_Number)sysconf(_SC_CLK_TCK));
  lua_setfield(L,-2,"cutime");
  lua_pushnumber(L, ((lua_Number)(r.tms_cstime))/(lua_Number)sysconf(_SC_CLK_TCK));
  lua_setfield(L,-2,"cstime");
  return 1;
}
#endif

#if ! defined (__SUNOS__)

#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
  #define DELTA_EPOCH_IN_MICROSECS  11644473600000000Ui64
#else
  #define DELTA_EPOCH_IN_MICROSECS  11644473600000000ULL
#endif

static int os_gettimeofday (lua_State *L) {
  double v;
#ifndef WIN32
  struct timeval tv;
  gettimeofday(&tv, NULL);
  v = (double)tv.tv_sec + (double)tv.tv_usec / 1000000.0;
#else
  FILETIME ft;
  unsigned __int64 tmpres = 0;

  GetSystemTimeAsFileTime(&ft);

  tmpres |= ft.dwHighDateTime;
  tmpres <<= 32;
  tmpres |= ft.dwLowDateTime;
  tmpres /= 10;
  tmpres -= DELTA_EPOCH_IN_MICROSECS; /*converting file time to unix epoch*/
  v = (double)tmpres / 1000000.0; 
#endif
  lua_pushnumber(L, v);
  return 1;
}
#endif

static const char repl[] = "0123456789abcdefghijklmnopqrstuvwxyz";

static int dirs_made = 0;

#define MAXTRIES 36*36*36

char *
do_mkdtemp (char *tmpl)
{
  int count ;
  int value ;
  char *xes = &tmpl[strlen (tmpl) - 6];
  /* this is not really all that random, but it will do */
  if (dirs_made==0) {
	srand(time(NULL));
  }
  value = rand();
  for (count = 0; count < MAXTRIES; value += 8413, ++count) {
      int v = value;
      xes[0] = repl[v % 36];  v /= 36;
      xes[1] = repl[v % 36];  v /= 36;
      xes[2] = repl[v % 36];  v /= 36;
      xes[3] = repl[v % 36];  v /= 36;
      xes[4] = repl[v % 36];  v /= 36;
      xes[5] = repl[v % 36];
	  if (mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR) >= 0) {
		dirs_made++;
		return tmpl;
	  } else if (errno != EEXIST) {
		return NULL;
	  }
    }
  return NULL;
}

static int os_tmpdir (lua_State *L) {
  char *s, *tempdir; 
  char *tmp = (char *)luaL_optstring(L, 1, "luatex.XXXXXX");
  if (tmp==NULL || 
	  strlen(tmp)<6 ||
	  (strcmp(tmp+strlen(tmp)-6,"XXXXXX") != 0)) {
    lua_pushnil(L);
    lua_pushstring(L, "Invalid argument to os.tmpdir()");
    return 2;
  } else {
	tempdir = xstrdup(tmp);
  }
#ifdef HAVE_MKDTEMP
  s = mkdtemp(tempdir);
#else
  s = do_mkdtemp(tempdir);
#endif
  if (s==NULL) {
	int en = errno;  /* calls to Lua API may change this value */
	lua_pushnil(L);
	lua_pushfstring(L, "%s", strerror(en));
	return 2;
  } else {
	lua_pushstring(L,s);
	return 1;
  }
}


void
open_oslibext (lua_State *L, int safer_option) {

  find_env(L);

  lua_getglobal(L,"os");
  lua_pushcfunction(L, ex_sleep);
  lua_setfield(L,-2,"sleep");
  lua_getglobal(L,"os");
  lua_pushliteral(L, OS_PLATTYPE);
  lua_setfield(L,-2,"type");
  lua_getglobal(L,"os");
  lua_pushliteral(L, OS_PLATNAME);
  lua_setfield(L,-2,"name");
#if (! defined (WIN32))  && (! defined (__SUNOS__))
  lua_getglobal(L,"os");
  lua_pushcfunction(L, os_times);
  lua_setfield(L,-2,"times");
#endif
#if ! defined (__SUNOS__)
  lua_getglobal(L,"os");
  lua_pushcfunction(L, os_gettimeofday);
  lua_setfield(L,-2,"gettimeofday");
#endif
  if (!safer_option) {
	lua_getglobal(L,"os");
	lua_pushcfunction(L, os_setenv);
	lua_setfield(L,-2,"setenv");
	lua_getglobal(L,"os");
	lua_pushcfunction(L, os_exec);
	lua_setfield(L,-2,"exec");
	lua_getglobal(L,"os");
	lua_pushcfunction(L, os_spawn);
	lua_setfield(L,-2,"spawn");
	lua_getglobal(L,"os");
	lua_pushcfunction(L, os_tmpdir);
	lua_setfield(L,-2,"tmpdir");

  }


}