1 /* $Id: mdoc_hash.c,v 1.18 2011/07/24 18:15:14 kristaps Exp $ */ 2 /* 3 * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 #ifdef HAVE_CONFIG_H 18 #include "config.h" 19 #endif 20 21 #include <sys/types.h> 22 23 #include <assert.h> 24 #include <ctype.h> 25 #include <limits.h> 26 #include <stdlib.h> 27 #include <stdio.h> 28 #include <string.h> 29 30 #include "mdoc.h" 31 #include "mandoc.h" 32 #include "libmdoc.h" 33 34 static unsigned char table[27 * 12]; 35 36 /* 37 * XXX - this hash has global scope, so if intended for use as a library 38 * with multiple callers, it will need re-invocation protection. 39 */ 40 void 41 mdoc_hash_init(void) 42 { 43 int i, j, major; 44 const char *p; 45 46 memset(table, UCHAR_MAX, sizeof(table)); 47 48 for (i = 0; i < (int)MDOC_MAX; i++) { 49 p = mdoc_macronames[i]; 50 51 if (isalpha((unsigned char)p[1])) 52 major = 12 * (tolower((unsigned char)p[1]) - 97); 53 else 54 major = 12 * 26; 55 56 for (j = 0; j < 12; j++) 57 if (UCHAR_MAX == table[major + j]) { 58 table[major + j] = (unsigned char)i; 59 break; 60 } 61 62 assert(j < 12); 63 } 64 } 65 66 enum mdoct 67 mdoc_hash_find(const char *p) 68 { 69 int major, i, j; 70 71 if (0 == p[0]) 72 return(MDOC_MAX); 73 if ( ! isalpha((unsigned char)p[0]) && '%' != p[0]) 74 return(MDOC_MAX); 75 76 if (isalpha((unsigned char)p[1])) 77 major = 12 * (tolower((unsigned char)p[1]) - 97); 78 else if ('1' == p[1]) 79 major = 12 * 26; 80 else 81 return(MDOC_MAX); 82 83 if (p[2] && p[3]) 84 return(MDOC_MAX); 85 86 for (j = 0; j < 12; j++) { 87 if (UCHAR_MAX == (i = table[major + j])) 88 break; 89 if (0 == strcmp(p, mdoc_macronames[i])) 90 return((enum mdoct)i); 91 } 92 93 return(MDOC_MAX); 94 } 95