Annotation of src/usr.bin/mandoc/chars.c, Revision 1.19
1.19 ! schwarze 1: /* $Id: chars.c,v 1.18 2011/04/24 16:22:02 schwarze Exp $ */
1.1 schwarze 2: /*
1.19 ! schwarze 3: * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
1.16 schwarze 4: * Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org>
1.1 schwarze 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: #include <assert.h>
1.19 ! schwarze 19: #include <ctype.h>
1.3 schwarze 20: #include <stdio.h>
1.1 schwarze 21: #include <stdlib.h>
22: #include <string.h>
23:
1.7 schwarze 24: #include "mandoc.h"
1.19 ! schwarze 25: #include "libmandoc.h"
1.1 schwarze 26:
27: #define PRINT_HI 126
28: #define PRINT_LO 32
29:
30: struct ln {
31: struct ln *next;
32: const char *code;
33: const char *ascii;
1.9 schwarze 34: int unicode;
1.1 schwarze 35: };
36:
1.19 ! schwarze 37: #define LINES_MAX 325
1.1 schwarze 38:
1.10 schwarze 39: #define CHAR(in, ch, code) \
1.19 ! schwarze 40: { NULL, (in), (ch), (code) },
1.1 schwarze 41:
1.4 schwarze 42: #define CHAR_TBL_START static struct ln lines[LINES_MAX] = {
43: #define CHAR_TBL_END };
44:
1.1 schwarze 45: #include "chars.in"
46:
1.19 ! schwarze 47: struct mchars {
1.1 schwarze 48: struct ln **htab;
49: };
50:
1.19 ! schwarze 51: static inline int match(const struct ln *, const char *, size_t);
! 52: static const struct ln *find(struct mchars *, const char *, size_t);
1.1 schwarze 53:
54: void
1.19 ! schwarze 55: mchars_free(struct mchars *arg)
1.1 schwarze 56: {
57:
1.19 ! schwarze 58: free(arg->htab);
! 59: free(arg);
1.1 schwarze 60: }
61:
1.19 ! schwarze 62: struct mchars *
! 63: mchars_alloc(void)
1.1 schwarze 64: {
1.19 ! schwarze 65: struct mchars *tab;
1.1 schwarze 66: struct ln **htab;
67: struct ln *pp;
68: int i, hash;
69:
70: /*
71: * Constructs a very basic chaining hashtable. The hash routine
72: * is simply the integral value of the first character.
73: * Subsequent entries are chained in the order they're processed
74: * (they're in-line re-ordered during lookup).
75: */
76:
1.19 ! schwarze 77: tab = mandoc_malloc(sizeof(struct mchars));
1.17 schwarze 78: htab = mandoc_calloc(PRINT_HI - PRINT_LO + 1, sizeof(struct ln **));
1.1 schwarze 79:
80: for (i = 0; i < LINES_MAX; i++) {
81: hash = (int)lines[i].code[0] - PRINT_LO;
82:
83: if (NULL == (pp = htab[hash])) {
84: htab[hash] = &lines[i];
85: continue;
86: }
87:
88: for ( ; pp->next; pp = pp->next)
89: /* Scan ahead. */ ;
90: pp->next = &lines[i];
91: }
92:
93: tab->htab = htab;
94: return(tab);
95: }
96:
97:
1.9 schwarze 98: /*
99: * Special character to Unicode codepoint.
100: */
101: int
1.19 ! schwarze 102: mchars_spec2cp(struct mchars *arg, const char *p, size_t sz)
1.9 schwarze 103: {
104: const struct ln *ln;
105:
1.19 ! schwarze 106: ln = find(arg, p, sz);
1.9 schwarze 107: if (NULL == ln)
108: return(-1);
109: return(ln->unicode);
110: }
111:
1.19 ! schwarze 112: /*
! 113: * Numbered character string to ASCII codepoint.
! 114: * This can only be a printable character (i.e., alnum, punct, space) so
! 115: * prevent the character from ruining our state (backspace, newline, and
! 116: * so on).
! 117: * If the character is illegal, returns '\0'.
1.9 schwarze 118: */
1.19 ! schwarze 119: char
! 120: mchars_num2char(const char *p, size_t sz)
1.9 schwarze 121: {
1.19 ! schwarze 122: int i;
1.9 schwarze 123:
1.19 ! schwarze 124: if ((i = mandoc_strntou(p, sz, 10)) < 0)
! 125: return('\0');
! 126: return(isprint(i) ? i : '\0');
1.16 schwarze 127: }
128:
129: /*
1.19 ! schwarze 130: * Hex character string to Unicode codepoint.
! 131: * If the character is illegal, returns '\0'.
1.16 schwarze 132: */
1.19 ! schwarze 133: int
! 134: mchars_num2uc(const char *p, size_t sz)
1.16 schwarze 135: {
1.19 ! schwarze 136: int i;
1.16 schwarze 137:
1.19 ! schwarze 138: if ((i = mandoc_strntou(p, sz, 16)) < 0)
! 139: return('\0');
! 140: /* FIXME: make sure we're not in a bogus range. */
! 141: return(i > 0x80 && i <= 0x10FFFF ? i : '\0');
1.9 schwarze 142: }
143:
144: /*
145: * Special character to string array.
146: */
1.1 schwarze 147: const char *
1.19 ! schwarze 148: mchars_spec2str(struct mchars *arg, const char *p, size_t sz, size_t *rsz)
1.1 schwarze 149: {
1.9 schwarze 150: const struct ln *ln;
151:
1.19 ! schwarze 152: ln = find(arg, p, sz);
1.9 schwarze 153: if (NULL == ln)
154: return(NULL);
1.1 schwarze 155:
1.10 schwarze 156: *rsz = strlen(ln->ascii);
1.9 schwarze 157: return(ln->ascii);
1.1 schwarze 158: }
159:
1.9 schwarze 160: static const struct ln *
1.19 ! schwarze 161: find(struct mchars *tab, const char *p, size_t sz)
1.1 schwarze 162: {
163: struct ln *pp, *prev;
164: struct ln **htab;
165: int hash;
166:
167: assert(p);
1.9 schwarze 168: if (0 == sz)
169: return(NULL);
1.1 schwarze 170:
171: if (p[0] < PRINT_LO || p[0] > PRINT_HI)
172: return(NULL);
173:
174: /*
175: * Lookup the symbol in the symbol hash. See ascii2htab for the
176: * hashtable specs. This dynamically re-orders the hash chain
177: * to optimise for repeat hits.
178: */
179:
180: hash = (int)p[0] - PRINT_LO;
181: htab = tab->htab;
182:
183: if (NULL == (pp = htab[hash]))
184: return(NULL);
185:
186: for (prev = NULL; pp; pp = pp->next) {
1.19 ! schwarze 187: if ( ! match(pp, p, sz)) {
1.1 schwarze 188: prev = pp;
189: continue;
190: }
191:
192: if (prev) {
193: prev->next = pp->next;
194: pp->next = htab[hash];
195: htab[hash] = pp;
196: }
197:
1.9 schwarze 198: return(pp);
1.1 schwarze 199: }
200:
201: return(NULL);
202: }
203:
204: static inline int
1.19 ! schwarze 205: match(const struct ln *ln, const char *p, size_t sz)
1.1 schwarze 206: {
207:
1.9 schwarze 208: if (strncmp(ln->code, p, sz))
1.1 schwarze 209: return(0);
1.9 schwarze 210: return('\0' == ln->code[(int)sz]);
1.1 schwarze 211: }
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