168 lines
3.5 KiB
C
168 lines
3.5 KiB
C
/* $Id: chars.c,v 1.54 2013/06/20 22:39:30 schwarze Exp $ */
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/*
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* Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
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* Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <assert.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "mandoc.h"
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#include "libmandoc.h"
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#define PRINT_HI 126
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#define PRINT_LO 32
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struct ln {
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struct ln *next;
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const char *code;
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const char *ascii;
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int unicode;
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};
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#define LINES_MAX 329
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#define CHAR(in, ch, code) \
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{ NULL, (in), (ch), (code) },
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#define CHAR_TBL_START static struct ln lines[LINES_MAX] = {
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#define CHAR_TBL_END };
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#include "chars.in"
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struct mchars {
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struct ln **htab;
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};
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static const struct ln *find(const struct mchars *,
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const char *, size_t);
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void
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mchars_free(struct mchars *arg)
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{
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free(arg->htab);
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free(arg);
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}
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struct mchars *
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mchars_alloc(void)
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{
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struct mchars *tab;
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struct ln **htab;
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struct ln *pp;
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int i, hash;
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/*
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* Constructs a very basic chaining hashtable. The hash routine
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* is simply the integral value of the first character.
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* Subsequent entries are chained in the order they're processed.
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*/
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tab = mandoc_malloc(sizeof(struct mchars));
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htab = mandoc_calloc(PRINT_HI - PRINT_LO + 1, sizeof(struct ln *));
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for (i = 0; i < LINES_MAX; i++) {
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hash = (int)lines[i].code[0] - PRINT_LO;
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if (NULL == (pp = htab[hash])) {
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htab[hash] = &lines[i];
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continue;
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}
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for ( ; pp->next; pp = pp->next)
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/* Scan ahead. */ ;
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pp->next = &lines[i];
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}
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tab->htab = htab;
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return(tab);
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}
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int
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mchars_spec2cp(const struct mchars *arg, const char *p, size_t sz)
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{
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const struct ln *ln;
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ln = find(arg, p, sz);
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if (NULL == ln)
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return(-1);
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return(ln->unicode);
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}
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char
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mchars_num2char(const char *p, size_t sz)
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{
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int i;
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if ((i = mandoc_strntoi(p, sz, 10)) < 0)
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return('\0');
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return(i > 0 && i < 256 && isprint(i) ?
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/* LINTED */ i : '\0');
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}
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int
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mchars_num2uc(const char *p, size_t sz)
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{
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int i;
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if ((i = mandoc_strntoi(p, sz, 16)) < 0)
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return('\0');
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/* FIXME: make sure we're not in a bogus range. */
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return(i > 0x80 && i <= 0x10FFFF ? i : '\0');
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}
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const char *
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mchars_spec2str(const struct mchars *arg,
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const char *p, size_t sz, size_t *rsz)
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{
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const struct ln *ln;
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ln = find(arg, p, sz);
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if (NULL == ln) {
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*rsz = 1;
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return(NULL);
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}
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*rsz = strlen(ln->ascii);
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return(ln->ascii);
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}
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static const struct ln *
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find(const struct mchars *tab, const char *p, size_t sz)
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{
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const struct ln *pp;
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int hash;
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assert(p);
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if (0 == sz || p[0] < PRINT_LO || p[0] > PRINT_HI)
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return(NULL);
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hash = (int)p[0] - PRINT_LO;
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for (pp = tab->htab[hash]; pp; pp = pp->next)
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if (0 == strncmp(pp->code, p, sz) &&
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'\0' == pp->code[(int)sz])
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return(pp);
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return(NULL);
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}
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