1 /* $Id: mdoc_hash.c,v 1.21 2014/08/10 23:54:41 schwarze 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 #include "config.h" 18 19 #include <sys/types.h> 20 21 #include <assert.h> 22 #include <ctype.h> 23 #include <limits.h> 24 #include <stdlib.h> 25 #include <stdio.h> 26 #include <string.h> 27 28 #include "mdoc.h" 29 #include "libmdoc.h" 30 31 static unsigned char table[27 * 12]; 32 33 34 /* 35 * XXX - this hash has global scope, so if intended for use as a library 36 * with multiple callers, it will need re-invocation protection. 37 */ 38 void 39 mdoc_hash_init(void) 40 { 41 int i, j, major; 42 const char *p; 43 44 memset(table, UCHAR_MAX, sizeof(table)); 45 46 for (i = 0; i < (int)MDOC_MAX; i++) { 47 p = mdoc_macronames[i]; 48 49 if (isalpha((unsigned char)p[1])) 50 major = 12 * (tolower((unsigned char)p[1]) - 97); 51 else 52 major = 12 * 26; 53 54 for (j = 0; j < 12; j++) 55 if (UCHAR_MAX == table[major + j]) { 56 table[major + j] = (unsigned char)i; 57 break; 58 } 59 60 assert(j < 12); 61 } 62 } 63 64 enum mdoct 65 mdoc_hash_find(const char *p) 66 { 67 int major, i, j; 68 69 if (0 == p[0]) 70 return(MDOC_MAX); 71 if ( ! isalpha((unsigned char)p[0]) && '%' != p[0]) 72 return(MDOC_MAX); 73 74 if (isalpha((unsigned char)p[1])) 75 major = 12 * (tolower((unsigned char)p[1]) - 97); 76 else if ('1' == p[1]) 77 major = 12 * 26; 78 else 79 return(MDOC_MAX); 80 81 if (p[2] && p[3]) 82 return(MDOC_MAX); 83 84 for (j = 0; j < 12; j++) { 85 if (UCHAR_MAX == (i = table[major + j])) 86 break; 87 if (0 == strcmp(p, mdoc_macronames[i])) 88 return((enum mdoct)i); 89 } 90 91 return(MDOC_MAX); 92 } 93