1 #include "c.h"
2
3
4 static struct string {
5 char *str;
6 int len;
7 struct string *link;
8 } *buckets[1024];
9 static int scatter[] = { /* map characters to random values */
10 2078917053, 143302914, 1027100827, 1953210302, 755253631,
11 2002600785, 1405390230, 45248011, 1099951567, 433832350,
12 2018585307, 438263339, 813528929, 1703199216, 618906479,
13 573714703, 766270699, 275680090, 1510320440, 1583583926,
14 1723401032, 1965443329, 1098183682, 1636505764, 980071615,
15 1011597961, 643279273, 1315461275, 157584038, 1069844923,
16 471560540, 89017443, 1213147837, 1498661368, 2042227746,
17 1968401469, 1353778505, 1300134328, 2013649480, 306246424,
18 1733966678, 1884751139, 744509763, 400011959, 1440466707,
19 1363416242, 973726663, 59253759, 1639096332, 336563455,
20 1642837685, 1215013716, 154523136, 593537720, 704035832,
21 1134594751, 1605135681, 1347315106, 302572379, 1762719719,
22 269676381, 774132919, 1851737163, 1482824219, 125310639,
23 1746481261, 1303742040, 1479089144, 899131941, 1169907872,
24 1785335569, 485614972, 907175364, 382361684, 885626931,
25 200158423, 1745777927, 1859353594, 259412182, 1237390611,
26 48433401, 1902249868, 304920680, 202956538, 348303940,
27 1008956512, 1337551289, 1953439621, 208787970, 1640123668,
28 1568675693, 478464352, 266772940, 1272929208, 1961288571,
29 392083579, 871926821, 1117546963, 1871172724, 1771058762,
30 139971187, 1509024645, 109190086, 1047146551, 1891386329,
31 994817018, 1247304975, 1489680608, 706686964, 1506717157,
32 579587572, 755120366, 1261483377, 884508252, 958076904,
33 1609787317, 1893464764, 148144545, 1415743291, 2102252735,
34 1788268214, 836935336, 433233439, 2055041154, 2109864544,
35 247038362, 299641085, 834307717, 1364585325, 23330161,
36 457882831, 1504556512, 1532354806, 567072918, 404219416,
37 1276257488, 1561889936, 1651524391, 618454448, 121093252,
38 1010757900, 1198042020, 876213618, 124757630, 2082550272,
39 1834290522, 1734544947, 1828531389, 1982435068, 1002804590,
40 1783300476, 1623219634, 1839739926, 69050267, 1530777140,
41 1802120822, 316088629, 1830418225, 488944891, 1680673954,
42 1853748387, 946827723, 1037746818, 1238619545, 1513900641,
43 1441966234, 367393385, 928306929, 946006977, 985847834,
44 1049400181, 1956764878, 36406206, 1925613800, 2081522508,
45 2118956479, 1612420674, 1668583807, 1800004220, 1447372094,
46 523904750, 1435821048, 923108080, 216161028, 1504871315,
47 306401572, 2018281851, 1820959944, 2136819798, 359743094,
48 1354150250, 1843084537, 1306570817, 244413420, 934220434,
49 672987810, 1686379655, 1301613820, 1601294739, 484902984,
50 139978006, 503211273, 294184214, 176384212, 281341425,
51 228223074, 147857043, 1893762099, 1896806882, 1947861263,
52 1193650546, 273227984, 1236198663, 2116758626, 489389012,
53 593586330, 275676551, 360187215, 267062626, 265012701,
54 719930310, 1621212876, 2108097238, 2026501127, 1865626297,
55 894834024, 552005290, 1404522304, 48964196, 5816381,
56 1889425288, 188942202, 509027654, 36125855, 365326415,
57 790369079, 264348929, 513183458, 536647531, 13672163,
58 313561074, 1730298077, 286900147, 1549759737, 1699573055,
59 776289160, 2143346068, 1975249606, 1136476375, 262925046,
60 92778659, 1856406685, 1884137923, 53392249, 1735424165,
61 1602280572
62 };
string(const char * str)63 char *string(const char *str) {
64 const char *s;
65
66 for (s = str; *s; s++)
67 ;
68 return stringn(str, s - str);
69 }
stringd(long n)70 char *stringd(long n) {
71 char str[25], *s = str + sizeof (str);
72 unsigned long m;
73
74 if (n == LONG_MIN)
75 m = (unsigned long)LONG_MAX + 1;
76 else if (n < 0)
77 m = -n;
78 else
79 m = n;
80 do
81 *--s = m%10 + '0';
82 while ((m /= 10) != 0);
83 if (n < 0)
84 *--s = '-';
85 return stringn(s, str + sizeof (str) - s);
86 }
stringn(const char * str,int len)87 char *stringn(const char *str, int len) {
88 int i;
89 unsigned int h;
90 const char *end;
91 struct string *p;
92
93 assert(str);
94 for (h = 0, i = len, end = str; i > 0; i--)
95 h = (h<<1) + scatter[*(unsigned char *)end++];
96 h &= NELEMS(buckets)-1;
97 for (p = buckets[h]; p; p = p->link)
98 if (len == p->len) {
99 const char *s1 = str;
100 char *s2 = p->str;
101 do {
102 if (s1 == end)
103 return p->str;
104 } while (*s1++ == *s2++);
105 }
106 {
107 static char *next, *strlimit;
108 if (len + 1 >= strlimit - next) {
109 int n = len + 4*1024;
110 next = allocate(n, PERM);
111 strlimit = next + n;
112 }
113 NEW(p, PERM);
114 p->len = len;
115 for (p->str = next; str < end; )
116 *next++ = *str++;
117 *next++ = 0;
118 p->link = buckets[h];
119 buckets[h] = p;
120 return p->str;
121 }
122 }
123