mdoc_hash.c revision 256281
1127664Sbms/* $Id: mdoc_hash.c,v 1.18 2011/07/24 18:15:14 kristaps Exp $ */ 2127664Sbms/* 3127664Sbms * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv> 4127664Sbms * 5127664Sbms * Permission to use, copy, modify, and distribute this software for any 6127664Sbms * purpose with or without fee is hereby granted, provided that the above 7127664Sbms * copyright notice and this permission notice appear in all copies. 8127664Sbms * 9127664Sbms * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10127664Sbms * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11127664Sbms * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12127664Sbms * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13127664Sbms * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14127664Sbms * 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 34static 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 */ 40void 41mdoc_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 66enum mdoct 67mdoc_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