Annotation of src/usr.bin/mandoc/chars.c, Revision 1.23
1.23 ! schwarze 1: /* $Id: chars.c,v 1.22 2011/09/18 10:25:28 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>
1.1 schwarze 20: #include <stdlib.h>
21: #include <string.h>
22:
1.7 schwarze 23: #include "mandoc.h"
1.19 schwarze 24: #include "libmandoc.h"
1.1 schwarze 25:
26: #define PRINT_HI 126
27: #define PRINT_LO 32
28:
29: struct ln {
30: struct ln *next;
31: const char *code;
32: const char *ascii;
1.9 schwarze 33: int unicode;
1.1 schwarze 34: };
35:
1.22 schwarze 36: #define LINES_MAX 328
1.1 schwarze 37:
1.10 schwarze 38: #define CHAR(in, ch, code) \
1.19 schwarze 39: { NULL, (in), (ch), (code) },
1.1 schwarze 40:
1.4 schwarze 41: #define CHAR_TBL_START static struct ln lines[LINES_MAX] = {
42: #define CHAR_TBL_END };
43:
1.1 schwarze 44: #include "chars.in"
45:
1.19 schwarze 46: struct mchars {
1.1 schwarze 47: struct ln **htab;
48: };
49:
1.23 ! schwarze 50: static const struct ln *find(const struct mchars *,
! 51: const char *, size_t);
1.1 schwarze 52:
53: void
1.19 schwarze 54: mchars_free(struct mchars *arg)
1.1 schwarze 55: {
56:
1.19 schwarze 57: free(arg->htab);
58: free(arg);
1.1 schwarze 59: }
60:
1.19 schwarze 61: struct mchars *
62: mchars_alloc(void)
1.1 schwarze 63: {
1.19 schwarze 64: struct mchars *tab;
1.1 schwarze 65: struct ln **htab;
66: struct ln *pp;
67: int i, hash;
68:
69: /*
70: * Constructs a very basic chaining hashtable. The hash routine
71: * is simply the integral value of the first character.
1.21 schwarze 72: * Subsequent entries are chained in the order they're processed.
1.1 schwarze 73: */
74:
1.19 schwarze 75: tab = mandoc_malloc(sizeof(struct mchars));
1.17 schwarze 76: htab = mandoc_calloc(PRINT_HI - PRINT_LO + 1, sizeof(struct ln **));
1.1 schwarze 77:
78: for (i = 0; i < LINES_MAX; i++) {
79: hash = (int)lines[i].code[0] - PRINT_LO;
80:
81: if (NULL == (pp = htab[hash])) {
82: htab[hash] = &lines[i];
83: continue;
84: }
85:
86: for ( ; pp->next; pp = pp->next)
87: /* Scan ahead. */ ;
88: pp->next = &lines[i];
89: }
90:
91: tab->htab = htab;
92: return(tab);
93: }
94:
1.9 schwarze 95: int
1.23 ! schwarze 96: mchars_spec2cp(const struct mchars *arg, const char *p, size_t sz)
1.9 schwarze 97: {
98: const struct ln *ln;
99:
1.19 schwarze 100: ln = find(arg, p, sz);
1.9 schwarze 101: if (NULL == ln)
102: return(-1);
103: return(ln->unicode);
104: }
105:
1.19 schwarze 106: char
107: mchars_num2char(const char *p, size_t sz)
1.9 schwarze 108: {
1.19 schwarze 109: int i;
1.9 schwarze 110:
1.22 schwarze 111: if ((i = mandoc_strntoi(p, sz, 10)) < 0)
1.19 schwarze 112: return('\0');
1.23 ! schwarze 113: return(i > 0 && i < 256 && isprint(i) ?
! 114: /* LINTED */ i : '\0');
1.16 schwarze 115: }
116:
1.19 schwarze 117: int
118: mchars_num2uc(const char *p, size_t sz)
1.16 schwarze 119: {
1.19 schwarze 120: int i;
1.16 schwarze 121:
1.22 schwarze 122: if ((i = mandoc_strntoi(p, sz, 16)) < 0)
1.19 schwarze 123: return('\0');
124: /* FIXME: make sure we're not in a bogus range. */
125: return(i > 0x80 && i <= 0x10FFFF ? i : '\0');
1.9 schwarze 126: }
127:
1.1 schwarze 128: const char *
1.23 ! schwarze 129: mchars_spec2str(const struct mchars *arg,
! 130: const char *p, size_t sz, size_t *rsz)
1.1 schwarze 131: {
1.9 schwarze 132: const struct ln *ln;
133:
1.19 schwarze 134: ln = find(arg, p, sz);
1.20 schwarze 135: if (NULL == ln) {
136: *rsz = 1;
1.9 schwarze 137: return(NULL);
1.20 schwarze 138: }
1.1 schwarze 139:
1.10 schwarze 140: *rsz = strlen(ln->ascii);
1.9 schwarze 141: return(ln->ascii);
1.1 schwarze 142: }
143:
1.9 schwarze 144: static const struct ln *
1.23 ! schwarze 145: find(const struct mchars *tab, const char *p, size_t sz)
1.1 schwarze 146: {
1.23 ! schwarze 147: const struct ln *pp;
1.1 schwarze 148: int hash;
149:
150: assert(p);
151:
1.21 schwarze 152: if (0 == sz || p[0] < PRINT_LO || p[0] > PRINT_HI)
1.1 schwarze 153: return(NULL);
154:
155: hash = (int)p[0] - PRINT_LO;
156:
1.21 schwarze 157: for (pp = tab->htab[hash]; pp; pp = pp->next)
158: if (0 == strncmp(pp->code, p, sz) &&
159: '\0' == pp->code[(int)sz])
160: return(pp);
1.1 schwarze 161:
162: return(NULL);
163: }
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