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- /* Original source written by Arnold Robbins */
-
- #include <ctype.h> /* for case-insensitive version */
- #include "hsearch.h" /* join the parts that were broken up */
-
- #define strcmp istrcmp /* for case-insensitive version */
-
- static ELEMENT **Table = NULL; /* pointer to dynamicly allocated table */
- static int Num_elem = -1; /* number of elements */
-
- extern char *calloc();
-
- extern void hdestroy();
- extern int hcreate();
- extern ENTRY *hsearch();
-
- static int hashit();
-
- /*
- * table of first 1900 or so primes, for use in finding the right prime
- * number to be the table size. this table may be generally useful...
- */
-
- static unsigned short primetab[] = {
- /*
- * comment these out, so that table will always have a minimal size...
- 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
- */
- 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151,
- 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233,
- 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317,
- 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419,
- 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503,
- 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607,
- 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701,
- 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811,
- 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911,
- 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997, 1009, 1013, 1019,
- 1021, 1031, 1033, 1039, 1049, 1051, 1061, 1063, 1069, 1087, 1091, 1093, 1097,
- 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163, 1171, 1181, 1187, 1193, 1201,
- 1213, 1217, 1223, 1229, 1231, 1237, 1249, 1259, 1277, 1279, 1283, 1289, 1291,
- 1297, 1301, 1303, 1307, 1319, 1321, 1327, 1361, 1367, 1373, 1381, 1399, 1409,
- 1423, 1427, 1429, 1433, 1439, 1447, 1451, 1453, 1459, 1471, 1481, 1483, 1487,
- 1489, 1493, 1499, 1511, 1523, 1531, 1543, 1549, 1553, 1559, 1567, 1571, 1579,
- 1583, 1597, 1601, 1607, 1609, 1613, 1619, 1621, 1627, 1637, 1657, 1663, 1667,
- 1669, 1693, 1697, 1699, 1709, 1721, 1723, 1733, 1741, 1747, 1753, 1759, 1777,
- 1783, 1787, 1789, 1801, 1811, 1823, 1831, 1847, 1861, 1867, 1871, 1873, 1877,
- 1879, 1889, 1901, 1907, 1913, 1931, 1933, 1949, 1951, 1973, 1979, 1987, 1993,
- 1997, 1999, 2003, 2011, 2017, 2027, 2029, 2039, 2053, 2063, 2069, 2081, 2083,
- 2087, 2089, 2099, 2111, 2113, 2129, 2131, 2137, 2141, 2143, 2153, 2161, 2179,
- 2203, 2207, 2213, 2221, 2237, 2239, 2243, 2251, 2267, 2269, 2273, 2281, 2287,
- 2293, 2297, 2309, 2311, 2333, 2339, 2341, 2347, 2351, 2357, 2371, 2377, 2381,
- 2383, 2389, 2393, 2399, 2411, 2417, 2423, 2437, 2441, 2447, 2459, 2467, 2473,
- 2477, 2503, 2521, 2531, 2539, 2543, 2549, 2551, 2557, 2579, 2591, 2593, 2609,
- 2617, 2621, 2633, 2647, 2657, 2659, 2663, 2671, 2677, 2683, 2687, 2689, 2693,
- 2699, 2707, 2711, 2713, 2719, 2729, 2731, 2741, 2749, 2753, 2767, 2777, 2789,
- 2791, 2797, 2801, 2803, 2819, 2833, 2837, 2843, 2851, 2857, 2861, 2879, 2887,
- 2897, 2903, 2909, 2917, 2927, 2939, 2953, 2957, 2963, 2969, 2971, 2999, 3001,
- 3011, 3019, 3023, 3037, 3041, 3049, 3061, 3067, 3079, 3083, 3089, 3109, 3119,
- 3121, 3137, 3163, 3167, 3169, 3181, 3187, 3191, 3203, 3209, 3217, 3221, 3229,
- 3251, 3253, 3257, 3259, 3271, 3299, 3301, 3307, 3313, 3319, 3323, 3329, 3331,
- 3343, 3347, 3359, 3361, 3371, 3373, 3389, 3391, 3407, 3413, 3433, 3449, 3457,
- 3461, 3463, 3467, 3469, 3491, 3499, 3511, 3517, 3527, 3529, 3533, 3539, 3541,
- 3547, 3557, 3559, 3571, 3581, 3583, 3593, 3607, 3613, 3617, 3623, 3631, 3637,
- 3643, 3659, 3671, 3673, 3677, 3691, 3697, 3701, 3709, 3719, 3727, 3733, 3739,
- 3761, 3767, 3769, 3779, 3793, 3797, 3803, 3821, 3823, 3833, 3847, 3851, 3853,
- 3863, 3877, 3881, 3889, 3907, 3911, 3917, 3919, 3923, 3929, 3931, 3943, 3947,
- 3967, 3989, 4001, 4003, 4007, 4013, 4019, 4021, 4027, 4049, 4051, 4057, 4073,
- 4079, 4091, 4093, 4099, 4111, 4127, 4129, 4133, 4139, 4153, 4157, 4159, 4177,
- 4201, 4211, 4217, 4219, 4229, 4231, 4241, 4243, 4253, 4259, 4261, 4271, 4273,
- 4283, 4289, 4297, 4327, 4337, 4339, 4349, 4357, 4363, 4373, 4391, 4397, 4409,
- 4421, 4423, 4441, 4447, 4451, 4457, 4463, 4481, 4483, 4493, 4507, 4513, 4517,
- 4519, 4523, 4547, 4549, 4561, 4567, 4583, 4591, 4597, 4603, 4621, 4637, 4639,
- 4643, 4649, 4651, 4657, 4663, 4673, 4679, 4691, 4703, 4721, 4723, 4729, 4733,
- 4751, 4759, 4783, 4787, 4789, 4793, 4799, 4801, 4813, 4817, 4831, 4861, 4871,
- 4877, 4889, 4903, 4909, 4919, 4931, 4933, 4937, 4943, 4951, 4957, 4967, 4969,
- 4973, 4987, 4993, 4999, 5003, 5009, 5011, 5021, 5023, 5039, 5051, 5059, 5077,
- 5081, 5087, 5099, 5101, 5107, 5113, 5119, 5147, 5153, 5167, 5171, 5179, 5189,
- 5197, 5209, 5227, 5231, 5233, 5237, 5261, 5273, 5279, 5281, 5297, 5303, 5309,
- 5323, 5333, 5347, 5351, 5381, 5387, 5393, 5399, 5407, 5413, 5417, 5419, 5431,
- 5437, 5441, 5443, 5449, 5471, 5477, 5479, 5483, 5501, 5503, 5507, 5519, 5521,
- 5527, 5531, 5557, 5563, 5569, 5573, 5581, 5591, 5623, 5639, 5641, 5647, 5651,
- 5653, 5657, 5659, 5669, 5683, 5689, 5693, 5701, 5711, 5717, 5737, 5741, 5743,
- 5749, 5779, 5783, 5791, 5801, 5807, 5813, 5821, 5827, 5839, 5843, 5849, 5851,
- 5857, 5861, 5867, 5869, 5879, 5881, 5897, 5903, 5923, 5927, 5939, 5953, 5981,
- 5987, 6007, 6011, 6029, 6037, 6043, 6047, 6053, 6067, 6073, 6079, 6089, 6091,
- 6101, 6113, 6121, 6131, 6133, 6143, 6151, 6163, 6173, 6197, 6199, 6203, 6211,
- 6217, 6221, 6229, 6247, 6257, 6263, 6269, 6271, 6277, 6287, 6299, 6301, 6311,
- 6317, 6323, 6329, 6337, 6343, 6353, 6359, 6361, 6367, 6373, 6379, 6389, 6397,
- 6421, 6427, 6449, 6451, 6469, 6473, 6481, 6491, 6521, 6529, 6547, 6551, 6553,
- 6563, 6569, 6571, 6577, 6581, 6599, 6607, 6619, 6637, 6653, 6659, 6661, 6673,
- 6679, 6689, 6691, 6701, 6703, 6709, 6719, 6733, 6737, 6761, 6763, 6779, 6781,
- 6791, 6793, 6803, 6823, 6827, 6829, 6833, 6841, 6857, 6863, 6869, 6871, 6883,
- 6899, 6907, 6911, 6917, 6947, 6949, 6959, 6961, 6967, 6971, 6977, 6983, 6991,
- 6997, 7001, 7013, 7019, 7027, 7039, 7043, 7057, 7069, 7079, 7103, 7109, 7121,
- 7127, 7129, 7151, 7159, 7177, 7187, 7193, 7207, 7211, 7213, 7219, 7229, 7237,
- 7243, 7247, 7253, 7283, 7297, 7307, 7309, 7321, 7331, 7333, 7349, 7351, 7369,
- 7393, 7411, 7417, 7433, 7451, 7457, 7459, 7477, 7481, 7487, 7489, 7499, 7507,
- 7517, 7523, 7529, 7537, 7541, 7547, 7549, 7559, 7561, 7573, 7577, 7583, 7589,
- 7591, 7603, 7607, 7621, 7639, 7643, 7649, 7669, 7673, 7681, 7687, 7691, 7699,
- 7703, 7717, 7723, 7727, 7741, 7753, 7757, 7759, 7789, 7793, 7817, 7823, 7829,
- 7841, 7853, 7867, 7873, 7877, 7879, 7883, 7901, 7907, 7919, 7927, 7933, 7937,
- 7949, 7951, 7963, 7993, 8009, 8011, 8017, 8039, 8053, 8059, 8069, 8081, 8087,
- 8089, 8093, 8101, 8111, 8117, 8123, 8147, 8161, 8167, 8171, 8179, 8191, 8209,
- 8219, 8221, 8231, 8233, 8237, 8243, 8263, 8269, 8273, 8287, 8291, 8293, 8297,
- 8311, 8317, 8329, 8353, 8363, 8369, 8377, 8387, 8389, 8419, 8423, 8429, 8431,
- 8443, 8447, 8461, 8467, 8501, 8513, 8521, 8527, 8537, 8539, 8543, 8563, 8573,
- 8581, 8597, 8599, 8609, 8623, 8627, 8629, 8641, 8647, 8663, 8669, 8677, 8681,
- 8689, 8693, 8699, 8707, 8713, 8719, 8731, 8737, 8741, 8747, 8753, 8761, 8779,
- 8783, 8803, 8807, 8819, 8821, 8831, 8837, 8839, 8849, 8861, 8863, 8867, 8887,
- 8893, 8923, 8929, 8933, 8941, 8951, 8963, 8969, 8971, 8999, 9001, 9007, 9011,
- 9013, 9029, 9041, 9043, 9049, 9059, 9067, 9091, 9103, 9109, 9127, 9133, 9137,
- 9151, 9157, 9161, 9173, 9181, 9187, 9199, 9203, 9209, 9221, 9227, 9239, 9241,
- 9257, 9277, 9281, 9283, 9293, 9311, 9319, 9323, 9337, 9341, 9343, 9349, 9371,
- 9377, 9391, 9397, 9403, 9413, 9419, 9421, 9431, 9433, 9437, 9439, 9461, 9463,
- 9467, 9473, 9479, 9491, 9497, 9511, 9521, 9533, 9539, 9547, 9551, 9587, 9601,
- 9613, 9619, 9623, 9629, 9631, 9643, 9649, 9661, 9677, 9679, 9689, 9697, 9719,
- 9721, 9733, 9739, 9743, 9749, 9767, 9769, 9781, 9787, 9791, 9803, 9811, 9817,
- 9829, 9833, 9839, 9851, 9857, 9859, 9871, 9883, 9887, 9901, 9907, 9923, 9929,
- 9931, 9941, 9949, 9967, 9973, 10007, 10009, 10037, 10039, 10061, 10067, 10069,
- 10079, 10091, 10093, 10099, 10103, 10111, 10133, 10139, 10141, 10151, 10159,
- 10163, 10169, 10177, 10181, 10193, 10211, 10223, 10243, 10247, 10253, 10259,
- 10267, 10271, 10273, 10289, 10301, 10303, 10313, 10321, 10331, 10333, 10337,
- 10343, 10357, 10369, 10391, 10399, 10427, 10429, 10433, 10453, 10457, 10459,
- 10463, 10477, 10487, 10499, 10501, 10513, 10529, 10531, 10559, 10567, 10589,
- 10597, 10601, 10607, 10613, 10627, 10631, 10639, 10651, 10657, 10663, 10667,
- 10687, 10691, 10709, 10711, 10723, 10729, 10733, 10739, 10753, 10771, 10781,
- 10789, 10799, 10831, 10837, 10847, 10853, 10859, 10861, 10867, 10883, 10889,
- 10891, 10903, 10909, 10937, 10939, 10949, 10957, 10973, 10979, 10987, 10993,
- 11003, 11027, 11047, 11057, 11059, 11069, 11071, 11083, 11087, 11093, 11113,
- 11117, 11119, 11131, 11149, 11159, 11161, 11171, 11173, 11177, 11197, 11213,
- 11239, 11243, 11251, 11257, 11261, 11273, 11279, 11287, 11299, 11311, 11317,
- 11321, 11329, 11351, 11353, 11369, 11383, 11393, 11399, 11411, 11423, 11437,
- 11443, 11447, 11467, 11471, 11483, 11489, 11491, 11497, 11503, 11519, 11527,
- 11549, 11551, 11579, 11587, 11593, 11597, 11617, 11621, 11633, 11657, 11677,
- 11681, 11689, 11699, 11701, 11717, 11719, 11731, 11743, 11777, 11779, 11783,
- 11789, 11801, 11807, 11813, 11821, 11827, 11831, 11833, 11839, 11863, 11867,
- 11887, 11897, 11903, 11909, 11923, 11927, 11933, 11939, 11941, 11953, 11959,
- 11969, 11971, 11981, 11987, 12007, 12011, 12037, 12041, 12043, 12049, 12071,
- 12073, 12097, 12101, 12107, 12109, 12113, 12119, 12143, 12149, 12157, 12161,
- 12163, 12197, 12203, 12211, 12227, 12239, 12241, 12251, 12253, 12263, 12269,
- 12277, 12281, 12289, 12301, 12323, 12329, 12343, 12347, 12373, 12377, 12379,
- 12391, 12401, 12409, 12413, 12421, 12433, 12437, 12451, 12457, 12473, 12479,
- 12487, 12491, 12497, 12503, 12511, 12517, 12527, 12539, 12541, 12547, 12553,
- 12569, 12577, 12583, 12589, 12601, 12611, 12613, 12619, 12637, 12641, 12647,
- 12653, 12659, 12671, 12689, 12697, 12703, 12713, 12721, 12739, 12743, 12757,
- 12763, 12781, 12791, 12799, 12809, 12821, 12823, 12829, 12841, 12853, 12889,
- 12893, 12899, 12907, 12911, 12917, 12919, 12923, 12941, 12953, 12959, 12967,
- 12973, 12979, 12983, 13001, 13003, 13007, 13009, 13033, 13037, 13043, 13049,
- 13063, 13093, 13099, 13103, 13109, 13121, 13127, 13147, 13151, 13159, 13163,
- 13171, 13177, 13183, 13187, 13217, 13219, 13229, 13241, 13249, 13259, 13267,
- 13291, 13297, 13309, 13313, 13327, 13331, 13337, 13339, 13367, 13381, 13397,
- 13399, 13411, 13417, 13421, 13441, 13451, 13457, 13463, 13469, 13477, 13487,
- 13499, 13513, 13523, 13537, 13553, 13567, 13577, 13591, 13597, 13613, 13619,
- 13627, 13633, 13649, 13669, 13679, 13681, 13687, 13691, 13693, 13697, 13709,
- 13711, 13721, 13723, 13729, 13751, 13757, 13759, 13763, 13781, 13789, 13799,
- 13807, 13829, 13831, 13841, 13859, 13873, 13877, 13879, 13883, 13901, 13903,
- 13907, 13913, 13921, 13931, 13933, 13963, 13967, 13997, 13999, 14009, 14011,
- 14029, 14033, 14051, 14057, 14071, 14081, 14083, 14087, 14107, 14143, 14149,
- 14153, 14159, 14173, 14177, 14197, 14207, 14221, 14243, 14249, 14251, 14281,
- 14293, 14303, 14321, 14323, 14327, 14341, 14347, 14369, 14387, 14389, 14401,
- 14407, 14411, 14419, 14423, 14431, 14437, 14447, 14449, 14461, 14479, 14489,
- 14503, 14519, 14533, 14537, 14543, 14549, 14551, 14557, 14561, 14563, 14591,
- 14593, 14621, 14627, 14629, 14633, 14639, 14653, 14657, 14669, 14683, 14699,
- 14713, 14717, 14723, 14731, 14737, 14741, 14747, 14753, 14759, 14767, 14771,
- 14779, 14783, 14797, 14813, 14821, 14827, 14831, 14843, 14851, 14867, 14869,
- 14879, 14887, 14891, 14897, 14923, 14929, 14939, 14947, 14951, 14957, 14969,
- 14983, 15013, 15017, 15031, 15053, 15061, 15073, 15077, 15083, 15091, 15101,
- 15107, 15121, 15131, 15137, 15139, 15149, 15161, 15173, 15187, 15193, 15199,
- 15217, 15227, 15233, 15241, 15259, 15263, 15269, 15271, 15277, 15287, 15289,
- 15299, 15307, 15313, 15319, 15329, 15331, 15349, 15359, 15361, 15373, 15377,
- 15383, 15391, 15401, 15413, 15427, 15439, 15443, 15451, 15461, 15467, 15473,
- 15493, 15497, 15511, 15527, 15541, 15551, 15559, 15569, 15581, 15583, 15601,
- 15607, 15619, 15629, 15641, 15643, 15647, 15649, 15661, 15667, 15671, 15679,
- 15683, 15727, 15731, 15733, 15737, 15739, 15749, 15761, 15767, 15773, 15787,
- 15791, 15797, 15803, 15809, 15817, 15823, 15859, 15877, 15881, 15887, 15889,
- 15901, 15907, 15913, 15919, 15923, 15937, 15959, 15971, 15973, 15991, 16001,
- 16007, 16033, 16057, 16061, 16063, 16067, 16069, 16073, 16087, 16091, 16097,
- 16103, 16111, 16127, 16139, 16141, 16183, 16187, 16189, 16193, 16217, 16223,
- 16229, 16231, 16249, 16253, 16267, 16273, 16301, 16319, 16333, 16339, 16349,
- 16361, 16363, 16369, 16381
- };
-
- /* hcreate --- create a hash table at least howmany big */
-
- int hcreate (howmany)
- register unsigned int howmany;
- {
- register int i, j;
-
- /*
- * find first prime number >= howmany, and use it for table size
- */
-
- if (Num_elem != -1) /* already a table out there */
- hdestroy(); /* remove it */
-
- j = sizeof (primetab) / sizeof (primetab[0]);
- for (i = 0; i < j; i++)
- if (primetab[i] >= howmany)
- break;
-
- if (i >= j) /* howmany bigger than any prime we have, use it */
- Num_elem = howmany;
- else
- Num_elem = primetab[i];
-
- if ((Table = (ELEMENT **) calloc (Num_elem, sizeof (ELEMENT *))) == NULL)
- return (0);
- else
- return (1);
- }
-
- /* idestroy --- destroy a single element on a chain */
-
- static void idestroy (elem)
- ELEMENT *elem;
- {
- if (elem != NULL)
- {
- idestroy (elem->next);
- free ((char *) elem);
- }
- }
-
- /* hdestroy --- nuke the existing hash table */
-
- void hdestroy()
- {
- register unsigned int i;
-
- if (Table != NULL)
- {
- /* free all the chains */
- for (i = 0; i < Num_elem; i++)
- idestroy (Table[i]);
-
- /* now the table itself */
- free ((char *) Table);
- Num_elem = -1;
- Table = NULL;
- }
- }
-
- /* hsearch --- lookup or enter an item in the hash table */
-
- ENTRY *hsearch (entry, action)
- ENTRY entry;
- ACTION action;
- {
- ELEMENT e;
- ELEMENT *ep = NULL;
- ELEMENT *ep2 = NULL;
- int index;
-
- if (Table == NULL)
- return (NULL);
-
- index = hashit (entry.key);
- if (Table[index] == NULL) /* nothing there */
- {
- if (action == FIND)
- return (NULL);
- else
- {
- /* add it to the table */
- e.item = entry;
- e.next = NULL;
- if ((Table[index] = (ELEMENT *) calloc (1, sizeof (ELEMENT))) == NULL)
- return (NULL);
- *Table[index] = e;
- return (& Table[index]->item);
- }
- }
- else
- {
- /* something in bucket, see if already on chain */
- for (ep = Table[index]; ep != NULL; ep = ep->next)
- {
- if (strcmp (ep->item.key, entry.key) == 0)
- {
- if (action == ENTER)
- ep->item.data = entry.data;
- /* already there, just change data */
- /* or action was just find it */
- return (& ep->item);
- }
- else
- ep2 = ep;
- }
- /* at this point, item was not in table */
- /* ep2 points at last element on the list */
- if (action == ENTER)
- {
- if ((ep2->next = (ELEMENT *) calloc (1, sizeof (ELEMENT))) == NULL)
- return (NULL);
- ep2->next->item = entry;
- ep2->next->next = NULL;
- return (& ep2->next->item);
- }
- else
- return (NULL);
- }
- /*NOTREACHED*/
- }
-
- /* hashit --- do the hashing algorithm */
-
- /*
- * algorithm is sum of string elements, plus string length
- * mod table size.
- *
- * made case insensitive for hyphenation program
- */
-
- static int hashit (text)
- register char *text;
- {
- register long int sum = 0;
- register int i;
- register int kludge;
-
- for (i = 0; (kludge = text[i]) != '\0'; i++)
- sum += (isupper(kludge) ? tolower(kludge) : kludge);
- sum += i;
-
- return (sum % Num_elem);
- }
-
-