Annotation of mandoc/chars.c, Revision 1.40
1.40 ! kristaps 1: /* $Id: chars.c,v 1.39 2011/04/30 22:24:31 kristaps Exp $ */
1.1 kristaps 2: /*
1.25 schwarze 3: * Copyright (c) 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
1.32 schwarze 4: * Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org>
1.1 kristaps 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: */
1.14 kristaps 18: #ifdef HAVE_CONFIG_H
19: #include "config.h"
20: #endif
21:
1.1 kristaps 22: #include <assert.h>
1.40 ! kristaps 23: #include <ctype.h>
1.10 kristaps 24: #include <stdio.h>
1.1 kristaps 25: #include <stdlib.h>
26: #include <string.h>
27:
1.18 kristaps 28: #include "mandoc.h"
1.1 kristaps 29:
1.2 kristaps 30: #define PRINT_HI 126
31: #define PRINT_LO 32
1.1 kristaps 32:
33: struct ln {
34: struct ln *next;
35: const char *code;
1.2 kristaps 36: const char *ascii;
1.21 kristaps 37: int unicode;
1.1 kristaps 38: int type;
39: #define CHARS_CHAR (1 << 0)
40: #define CHARS_STRING (1 << 1)
1.12 kristaps 41: #define CHARS_BOTH (CHARS_CHAR | CHARS_STRING)
1.1 kristaps 42: };
43:
1.35 kristaps 44: #define LINES_MAX 353
1.1 kristaps 45:
1.24 kristaps 46: #define CHAR(in, ch, code) \
47: { NULL, (in), (ch), (code), CHARS_CHAR },
48: #define STRING(in, ch, code) \
49: { NULL, (in), (ch), (code), CHARS_STRING },
50: #define BOTH(in, ch, code) \
51: { NULL, (in), (ch), (code), CHARS_BOTH },
1.1 kristaps 52:
1.13 kristaps 53: #define CHAR_TBL_START static struct ln lines[LINES_MAX] = {
54: #define CHAR_TBL_END };
55:
1.1 kristaps 56: #include "chars.in"
57:
1.36 kristaps 58: struct mchars {
1.1 kristaps 59: struct ln **htab;
60: };
61:
62: static inline int match(const struct ln *,
63: const char *, size_t, int);
1.36 kristaps 64: static const struct ln *find(struct mchars *, const char *, size_t, int);
1.1 kristaps 65:
66: void
1.36 kristaps 67: mchars_free(struct mchars *arg)
1.1 kristaps 68: {
69:
1.36 kristaps 70: free(arg->htab);
71: free(arg);
1.1 kristaps 72: }
73:
1.36 kristaps 74: struct mchars *
1.38 kristaps 75: mchars_alloc(void)
1.1 kristaps 76: {
1.36 kristaps 77: struct mchars *tab;
1.1 kristaps 78: struct ln **htab;
79: struct ln *pp;
80: int i, hash;
81:
82: /*
83: * Constructs a very basic chaining hashtable. The hash routine
84: * is simply the integral value of the first character.
85: * Subsequent entries are chained in the order they're processed
86: * (they're in-line re-ordered during lookup).
87: */
88:
1.36 kristaps 89: tab = mandoc_malloc(sizeof(struct mchars));
1.33 kristaps 90: htab = mandoc_calloc(PRINT_HI - PRINT_LO + 1, sizeof(struct ln **));
1.1 kristaps 91:
92: for (i = 0; i < LINES_MAX; i++) {
1.2 kristaps 93: hash = (int)lines[i].code[0] - PRINT_LO;
1.1 kristaps 94:
95: if (NULL == (pp = htab[hash])) {
96: htab[hash] = &lines[i];
97: continue;
98: }
99:
100: for ( ; pp->next; pp = pp->next)
101: /* Scan ahead. */ ;
102: pp->next = &lines[i];
103: }
104:
105: tab->htab = htab;
106: return(tab);
107: }
108:
109:
1.21 kristaps 110: /*
111: * Special character to Unicode codepoint.
112: */
113: int
1.36 kristaps 114: mchars_spec2cp(struct mchars *arg, const char *p, size_t sz)
1.21 kristaps 115: {
116: const struct ln *ln;
117:
1.36 kristaps 118: ln = find(arg, p, sz, CHARS_CHAR);
1.21 kristaps 119: if (NULL == ln)
120: return(-1);
121: return(ln->unicode);
122: }
123:
124:
125: /*
126: * Reserved word to Unicode codepoint.
127: */
128: int
1.36 kristaps 129: mchars_res2cp(struct mchars *arg, const char *p, size_t sz)
1.21 kristaps 130: {
131: const struct ln *ln;
132:
1.36 kristaps 133: ln = find(arg, p, sz, CHARS_STRING);
1.21 kristaps 134: if (NULL == ln)
135: return(-1);
136: return(ln->unicode);
1.32 schwarze 137: }
138:
139: /*
1.39 kristaps 140: * Numbered character to literal character.
1.40 ! kristaps 141: * This can only be a printable character (i.e., alnum, punct, space) so
! 142: * prevent the character from ruining our state (backspace, newline, and
! 143: * so on).
1.32 schwarze 144: */
1.39 kristaps 145: char
1.36 kristaps 146: mchars_num2char(const char *p, size_t sz)
1.32 schwarze 147: {
148: int i;
149:
150: if (sz > 3)
1.39 kristaps 151: return('\0');
152:
1.32 schwarze 153: i = atoi(p);
1.40 ! kristaps 154: return(isprint(i) ? (char)i : '\0');
1.21 kristaps 155: }
156:
157: /*
158: * Special character to string array.
159: */
1.1 kristaps 160: const char *
1.36 kristaps 161: mchars_spec2str(struct mchars *arg, const char *p, size_t sz, size_t *rsz)
1.1 kristaps 162: {
1.21 kristaps 163: const struct ln *ln;
164:
1.36 kristaps 165: ln = find(arg, p, sz, CHARS_CHAR);
1.21 kristaps 166: if (NULL == ln)
167: return(NULL);
1.1 kristaps 168:
1.24 kristaps 169: *rsz = strlen(ln->ascii);
1.21 kristaps 170: return(ln->ascii);
1.1 kristaps 171: }
172:
1.21 kristaps 173: /*
174: * Reserved word to string array.
175: */
1.1 kristaps 176: const char *
1.36 kristaps 177: mchars_res2str(struct mchars *arg, const char *p, size_t sz, size_t *rsz)
1.1 kristaps 178: {
1.21 kristaps 179: const struct ln *ln;
1.1 kristaps 180:
1.36 kristaps 181: ln = find(arg, p, sz, CHARS_STRING);
1.21 kristaps 182: if (NULL == ln)
183: return(NULL);
184:
1.24 kristaps 185: *rsz = strlen(ln->ascii);
1.21 kristaps 186: return(ln->ascii);
1.1 kristaps 187: }
188:
1.21 kristaps 189: static const struct ln *
1.36 kristaps 190: find(struct mchars *tab, const char *p, size_t sz, int type)
1.1 kristaps 191: {
192: struct ln *pp, *prev;
193: struct ln **htab;
194: int hash;
195:
196: assert(p);
1.23 kristaps 197: if (0 == sz)
198: return(NULL);
1.1 kristaps 199:
1.2 kristaps 200: if (p[0] < PRINT_LO || p[0] > PRINT_HI)
1.1 kristaps 201: return(NULL);
202:
203: /*
204: * Lookup the symbol in the symbol hash. See ascii2htab for the
205: * hashtable specs. This dynamically re-orders the hash chain
206: * to optimise for repeat hits.
207: */
208:
1.2 kristaps 209: hash = (int)p[0] - PRINT_LO;
1.1 kristaps 210: htab = tab->htab;
211:
212: if (NULL == (pp = htab[hash]))
213: return(NULL);
214:
215: for (prev = NULL; pp; pp = pp->next) {
216: if ( ! match(pp, p, sz, type)) {
217: prev = pp;
218: continue;
219: }
220:
221: if (prev) {
222: prev->next = pp->next;
223: pp->next = htab[hash];
224: htab[hash] = pp;
225: }
226:
1.21 kristaps 227: return(pp);
1.1 kristaps 228: }
229:
230: return(NULL);
231: }
232:
233: static inline int
234: match(const struct ln *ln, const char *p, size_t sz, int type)
235: {
236:
237: if ( ! (ln->type & type))
238: return(0);
1.22 kristaps 239: if (strncmp(ln->code, p, sz))
1.1 kristaps 240: return(0);
1.22 kristaps 241: return('\0' == ln->code[(int)sz]);
1.1 kristaps 242: }
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