1 /* $Id: chars.c,v 1.52 2011/11/08 00:15:23 kristaps Exp $ */ 2 /* 3 * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv> 4 * Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 #ifdef HAVE_CONFIG_H 19 #include "config.h" 20 #endif 21 22 #include <assert.h> 23 #include <ctype.h> 24 #include <stdlib.h> 25 #include <string.h> 26 27 #include "mandoc.h" 28 #include "libmandoc.h" 29 30 #define PRINT_HI 126 31 #define PRINT_LO 32 32 33 struct ln { 34 struct ln *next; 35 const char *code; 36 const char *ascii; 37 int unicode; 38 }; 39 40 #define LINES_MAX 328 41 42 #define CHAR(in, ch, code) \ 43 { NULL, (in), (ch), (code) }, 44 45 #define CHAR_TBL_START static struct ln lines[LINES_MAX] = { 46 #define CHAR_TBL_END }; 47 48 #include "chars.in" 49 50 struct mchars { 51 struct ln **htab; 52 }; 53 54 static const struct ln *find(const struct mchars *, 55 const char *, size_t); 56 57 void 58 mchars_free(struct mchars *arg) 59 { 60 61 free(arg->htab); 62 free(arg); 63 } 64 65 struct mchars * 66 mchars_alloc(void) 67 { 68 struct mchars *tab; 69 struct ln **htab; 70 struct ln *pp; 71 int i, hash; 72 73 /* 74 * Constructs a very basic chaining hashtable. The hash routine 75 * is simply the integral value of the first character. 76 * Subsequent entries are chained in the order they're processed. 77 */ 78 79 tab = mandoc_malloc(sizeof(struct mchars)); 80 htab = mandoc_calloc(PRINT_HI - PRINT_LO + 1, sizeof(struct ln **)); 81 82 for (i = 0; i < LINES_MAX; i++) { 83 hash = (int)lines[i].code[0] - PRINT_LO; 84 85 if (NULL == (pp = htab[hash])) { 86 htab[hash] = &lines[i]; 87 continue; 88 } 89 90 for ( ; pp->next; pp = pp->next) 91 /* Scan ahead. */ ; 92 pp->next = &lines[i]; 93 } 94 95 tab->htab = htab; 96 return(tab); 97 } 98 99 int 100 mchars_spec2cp(const struct mchars *arg, const char *p, size_t sz) 101 { 102 const struct ln *ln; 103 104 ln = find(arg, p, sz); 105 if (NULL == ln) 106 return(-1); 107 return(ln->unicode); 108 } 109 110 char 111 mchars_num2char(const char *p, size_t sz) 112 { 113 int i; 114 115 if ((i = mandoc_strntoi(p, sz, 10)) < 0) 116 return('\0'); 117 return(i > 0 && i < 256 && isprint(i) ? 118 /* LINTED */ i : '\0'); 119 } 120 121 int 122 mchars_num2uc(const char *p, size_t sz) 123 { 124 int i; 125 126 if ((i = mandoc_strntoi(p, sz, 16)) < 0) 127 return('\0'); 128 /* FIXME: make sure we're not in a bogus range. */ 129 return(i > 0x80 && i <= 0x10FFFF ? i : '\0'); 130 } 131 132 const char * 133 mchars_spec2str(const struct mchars *arg, 134 const char *p, size_t sz, size_t *rsz) 135 { 136 const struct ln *ln; 137 138 ln = find(arg, p, sz); 139 if (NULL == ln) { 140 *rsz = 1; 141 return(NULL); 142 } 143 144 *rsz = strlen(ln->ascii); 145 return(ln->ascii); 146 } 147 148 static const struct ln * 149 find(const struct mchars *tab, const char *p, size_t sz) 150 { 151 const struct ln *pp; 152 int hash; 153 154 assert(p); 155 156 if (0 == sz || p[0] < PRINT_LO || p[0] > PRINT_HI) 157 return(NULL); 158 159 hash = (int)p[0] - PRINT_LO; 160 161 for (pp = tab->htab[hash]; pp; pp = pp->next) 162 if (0 == strncmp(pp->code, p, sz) && 163 '\0' == pp->code[(int)sz]) 164 return(pp); 165 166 return(NULL); 167 } 168