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1.1 ! root 1: /* C compiler: string & list management */ ! 2: ! 3: #include "c.h" ! 4: ! 5: #define TABLESIZE 1024 ! 6: static struct string { /* strings: */ ! 7: char *str; /* pointer to the string */ ! 8: int len; /* its length */ ! 9: struct string *link; /* next one on this chain */ ! 10: } *buckets[TABLESIZE]; /* the string table */ ! 11: ! 12: static char *next; /* slot for next allocated string */ ! 13: static char *strlimit; /* 1 past end of current string region */ ! 14: static int scatter[] = { /* map characters to random values */ ! 15: 2078917053, 143302914, 1027100827, 1953210302, 755253631, ! 16: 2002600785, 1405390230, 45248011, 1099951567, 433832350, ! 17: 2018585307, 438263339, 813528929, 1703199216, 618906479, ! 18: 573714703, 766270699, 275680090, 1510320440, 1583583926, ! 19: 1723401032, 1965443329, 1098183682, 1636505764, 980071615, ! 20: 1011597961, 643279273, 1315461275, 157584038, 1069844923, ! 21: 471560540, 89017443, 1213147837, 1498661368, 2042227746, ! 22: 1968401469, 1353778505, 1300134328, 2013649480, 306246424, ! 23: 1733966678, 1884751139, 744509763, 400011959, 1440466707, ! 24: 1363416242, 973726663, 59253759, 1639096332, 336563455, ! 25: 1642837685, 1215013716, 154523136, 593537720, 704035832, ! 26: 1134594751, 1605135681, 1347315106, 302572379, 1762719719, ! 27: 269676381, 774132919, 1851737163, 1482824219, 125310639, ! 28: 1746481261, 1303742040, 1479089144, 899131941, 1169907872, ! 29: 1785335569, 485614972, 907175364, 382361684, 885626931, ! 30: 200158423, 1745777927, 1859353594, 259412182, 1237390611, ! 31: 48433401, 1902249868, 304920680, 202956538, 348303940, ! 32: 1008956512, 1337551289, 1953439621, 208787970, 1640123668, ! 33: 1568675693, 478464352, 266772940, 1272929208, 1961288571, ! 34: 392083579, 871926821, 1117546963, 1871172724, 1771058762, ! 35: 139971187, 1509024645, 109190086, 1047146551, 1891386329, ! 36: 994817018, 1247304975, 1489680608, 706686964, 1506717157, ! 37: 579587572, 755120366, 1261483377, 884508252, 958076904, ! 38: 1609787317, 1893464764, 148144545, 1415743291, 2102252735, ! 39: 1788268214, 836935336, 433233439, 2055041154, 2109864544, ! 40: 247038362, 299641085, 834307717 ! 41: }; ! 42: static List freenodes; /* free list nodes */ ! 43: ! 44: char *stringn(str, n) char *str; { ! 45: int i; ! 46: unsigned int h; ! 47: char *end; ! 48: struct string *p; ! 49: ! 50: assert(str); ! 51: for (h = 0, i = n, end = str; i > 0; i--) ! 52: h = (h<<1) + scatter[*(unsigned char *)end++]; ! 53: h &= TABLESIZE-1; ! 54: for (p = buckets[h]; p; p = p->link) ! 55: if (n == p->len) { ! 56: char *s1 = str, *s2 = p->str; ! 57: do { ! 58: if (s1 == end) ! 59: return p->str; ! 60: } while (*s1++ == *s2++); ! 61: } ! 62: if (next + n + 1 >= strlimit) { ! 63: int m = roundup(n, 8) + BUFSIZE; ! 64: next = alloc(m); ! 65: strlimit = next + m; ! 66: } ! 67: p = (struct string *) alloc(sizeof *p); ! 68: p->len = n; ! 69: for (p->str = next; str < end; ) ! 70: *next++ = *str++; ! 71: *next++ = 0; ! 72: p->link = buckets[h]; ! 73: buckets[h] = p; ! 74: return p->str; ! 75: } ! 76: char *string(str) char *str; { ! 77: char *s; ! 78: ! 79: for (s = str; *s; s++) ! 80: ; ! 81: return stringn(str, s - str); ! 82: } ! 83: char *stringd(n) { ! 84: char str[30], *s = &str[30]; ! 85: unsigned m; ! 86: ! 87: if (n == INT_MIN) ! 88: m = (unsigned)INT_MAX + 1; ! 89: else if (n < 0) ! 90: m = -n; ! 91: else ! 92: m = n; ! 93: do ! 94: *--s = m%10 + '0'; ! 95: while (m /= 10); ! 96: if (n < 0) ! 97: *--s = '-'; ! 98: return stringn(s, &str[30] - s); ! 99: } ! 100: /* append - append x to list, return new list */ ! 101: List append(x, list) Generic x; List list; { ! 102: List new; ! 103: ! 104: if (new = freenodes) ! 105: freenodes = freenodes->link; ! 106: else ! 107: new = (List)alloc(sizeof *new); ! 108: if (list) { ! 109: new->link = list->link; ! 110: list->link = new; ! 111: } else ! 112: new->link = new; ! 113: new->x = x; ! 114: return new; ! 115: } ! 116: ! 117: /* length - # elements in list */ ! 118: int length(list) List list; { ! 119: int n = 0; ! 120: ! 121: if (list) { ! 122: List lp = list; ! 123: do n++; ! 124: while ((lp = lp->link) != list); ! 125: } ! 126: return n; ! 127: } ! 128: ! 129: /* ltoa - convert list to an 0-terminated array in a[0..length(list)] */ ! 130: Generic *ltoa(list, a) List list; Generic a[]; { ! 131: int i = 0; ! 132: ! 133: if (a == 0) ! 134: a = (Generic *)talloc((length(list) + 1)*sizeof a[0]); ! 135: if (list) { ! 136: List lp = list; ! 137: do { ! 138: lp = lp->link; ! 139: a[i++] = lp->x; ! 140: } while (lp != list); ! 141: lp = list->link; ! 142: list->link = freenodes; ! 143: freenodes = lp; ! 144: } ! 145: a[i] = 0; ! 146: return a; ! 147: } ! 148:
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