// -*- related-file-name: "../include/lcdf/permstr.hh" -*- /* permstr.{cc,hh} -- permanent strings * * Copyright (c) 1998-2008 Eddie Kohler * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. This program is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General * Public License for more details. */ #ifdef HAVE_CONFIG_H # include #endif #include #include #include #include static PermString::Initializer initializer; PermString::Doodad PermString::zero_char_doodad = { 0, 0, { 0, 0 } }; PermString::Doodad PermString::one_char_doodad[256]; PermString::Doodad* PermString::buckets[NHASH]; PermString::Initializer::Initializer() { static int initialized = 0; if (!initialized) { PermString::static_initialize(); initialized = 1; } } void PermString::static_initialize() { for (int i = 0; i < 256; i++) { one_char_doodad[i].next = 0; one_char_doodad[i].length = 1; one_char_doodad[i].data[0] = i; one_char_doodad[i].data[1] = 0; } } // This scatter array, and the ideas behind it, are stolen from lcc. static int scatter[] = { /* map characters to random values */ 2078917053, 143302914, 1027100827, 1953210302, 755253631, 2002600785, 1405390230, 45248011, 1099951567, 433832350, 2018585307, 438263339, 813528929, 1703199216, 618906479, 573714703, 766270699, 275680090, 1510320440, 1583583926, 1723401032, 1965443329, 1098183682, 1636505764, 980071615, 1011597961, 643279273, 1315461275, 157584038, 1069844923, 471560540, 89017443, 1213147837, 1498661368, 2042227746, 1968401469, 1353778505, 1300134328, 2013649480, 306246424, 1733966678, 1884751139, 744509763, 400011959, 1440466707, 1363416242, 973726663, 59253759, 1639096332, 336563455, 1642837685, 1215013716, 154523136, 593537720, 704035832, 1134594751, 1605135681, 1347315106, 302572379, 1762719719, 269676381, 774132919, 1851737163, 1482824219, 125310639, 1746481261, 1303742040, 1479089144, 899131941, 1169907872, 1785335569, 485614972, 907175364, 382361684, 885626931, 200158423, 1745777927, 1859353594, 259412182, 1237390611, 48433401, 1902249868, 304920680, 202956538, 348303940, 1008956512, 1337551289, 1953439621, 208787970, 1640123668, 1568675693, 478464352, 266772940, 1272929208, 1961288571, 392083579, 871926821, 1117546963, 1871172724, 1771058762, 139971187, 1509024645, 109190086, 1047146551, 1891386329, 994817018, 1247304975, 1489680608, 706686964, 1506717157, 579587572, 755120366, 1261483377, 884508252, 958076904, 1609787317, 1893464764, 148144545, 1415743291, 2102252735, 1788268214, 836935336, 433233439, 2055041154, 2109864544, 247038362, 299641085, 834307717, 1364585325, 23330161, 457882831, 1504556512, 1532354806, 567072918, 404219416, 1276257488, 1561889936, 1651524391, 618454448, 121093252, 1010757900, 1198042020, 876213618, 124757630, 2082550272, 1834290522, 1734544947, 1828531389, 1982435068, 1002804590, 1783300476, 1623219634, 1839739926, 69050267, 1530777140, 1802120822, 316088629, 1830418225, 488944891, 1680673954, 1853748387, 946827723, 1037746818, 1238619545, 1513900641, 1441966234, 367393385, 928306929, 946006977, 985847834, 1049400181, 1956764878, 36406206, 1925613800, 2081522508, 2118956479, 1612420674, 1668583807, 1800004220, 1447372094, 523904750, 1435821048, 923108080, 216161028, 1504871315, 306401572, 2018281851, 1820959944, 2136819798, 359743094, 1354150250, 1843084537, 1306570817, 244413420, 934220434, 672987810, 1686379655, 1301613820, 1601294739, 484902984, 139978006, 503211273, 294184214, 176384212, 281341425, 228223074, 147857043, 1893762099, 1896806882, 1947861263, 1193650546, 273227984, 1236198663, 2116758626, 489389012, 593586330, 275676551, 360187215, 267062626, 265012701, 719930310, 1621212876, 2108097238, 2026501127, 1865626297, 894834024, 552005290, 1404522304, 48964196, 5816381, 1889425288, 188942202, 509027654, 36125855, 365326415, 790369079, 264348929, 513183458, 536647531, 13672163, 313561074, 1730298077, 286900147, 1549759737, 1699573055, 776289160, 2143346068, 1975249606, 1136476375, 262925046, 92778659, 1856406685, 1884137923, 53392249, 1735424165, 1602280572 }; void PermString::initialize(const char* s, int length) { register unsigned char* m = (unsigned char*) s; register unsigned char* mm; if (length < 0) length = (s ? strlen(s) : 0); if (length == 0) { _rep = zero_char_doodad.data; return; } else if (length == 1) { _rep = one_char_doodad[m[0]].data; return; } unsigned hash; int l; for (hash = 0, l = length, mm = m; l; mm++, l--) hash = (hash << 1) + scatter[*mm]; hash &= (NHASH - 1); Doodad *buck; for (buck = buckets[hash]; buck; buck = buck->next) if (length == buck->length && memcmp(s, buck->data, length) == 0) { _rep = buck->data; return; } // CANNOT USE new because the structure has variable size. buck = (Doodad *)malloc(sizeof(Doodad) + length - 1); buck->next = buckets[hash]; buckets[hash] = buck; buck->length = length; memcpy(buck->data, s, length); buck->data[length] = 0; _rep = buck->data; } static int pspos; static int pscap = 64; static char *psc = (char *)malloc(pscap); static void append(const char *s, int len) { if (pspos + len >= pscap) { pscap *= 2; psc = (char *)realloc(psc, pscap); } memcpy(psc + pspos, s, len); pspos += len; } inline static void extend(int len) { while (pspos + len >= pscap) { pscap *= 2; psc = (char *)realloc(psc, pscap); } } PermString vpermprintf(const char *s, va_list val) { pspos = 0; while (1) { const char *pct = strchr(s, '%'); if (!pct) { if (*s) append(s, strlen(s)); break; } if (pct != s) { append(s, pct - s); s = pct; } int iflag = -1; while (1) switch (*++s) { case '0': /* zeroflag = 1; */ break; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': assert(iflag == -1 /* Too many decimal flags in permprintf */); iflag = 0; while (*s >= '0' && *s <= '9') { iflag = iflag * 10 + *s - '0'; s++; } break; case '*': assert(iflag == -1 /* iflag given */); iflag = va_arg(val, int); break; case 's': { const char *x = va_arg(val, const char *); if (x) { if (iflag < 0) append(x, strlen(x)); else append(x, iflag); } goto pctdone; } case 'c': { char c = (char)(va_arg(val, int) & 0xFF); append(&c, 1); goto pctdone; } case 'p': { PermString::Capsule x = va_arg(val, PermString::Capsule); PermString px; if (x) px = PermString::decapsule(x); if (iflag < 0 || iflag > px.length()) append(px.c_str(), px.length()); else append(px.c_str(), iflag); goto pctdone; } case 'd': { // FIXME FIXME rewrite for sense int x = va_arg(val, int); if (pspos == pscap) extend(1); // FIXME -2^31 unsigned int ux = x; if (x < 0) { psc[pspos++] = '-'; ux = -x; } int numdigits = 0; for (unsigned digcountx = ux; digcountx > 9; digcountx /= 10) numdigits++; extend(numdigits + 1); int digit = numdigits; do { psc[pspos + digit] = (ux % 10) + '0'; ux /= 10; digit--; } while (ux); pspos += numdigits + 1; goto pctdone; } case 'g': { // FIXME FIXME rewrite for sense double x = va_arg(val, double); char buffer[1000]; int len; sprintf(buffer, "%.10g%n", x, &len); extend(len); strcpy(psc + pspos, buffer); pspos += len; goto pctdone; } default: assert(0 /* Bad % in permprintf */); goto pctdone; } pctdone: s++; } return PermString(psc, pspos); } PermString permprintf(const char *s, ...) { va_list val; va_start(val, s); PermString p = vpermprintf(s, val); va_end(val); return p; } PermString permcat(PermString a, PermString b) { if (!a || !b) return a ? a : b; unsigned al = a.length(); unsigned bl = b.length(); char *s = new char[al + bl]; memcpy(s, a.c_str(), al); memcpy(s + al, b.c_str(), bl); PermString p(s, al + bl); delete[] s; return p; }