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/* $OpenBSD: chars.c,v 1.35 2014/10/29 00:17:01 schwarze Exp $ */
/*
* Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2011, 2014 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <assert.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "mandoc.h"
#include "mandoc_aux.h"
#include "libmandoc.h"
#define PRINT_HI 126
#define PRINT_LO 32
struct ln {
struct ln *next;
const char *code;
const char *ascii;
int unicode;
};
#define LINES_MAX 330
#define CHAR(in, ch, code) \
{ NULL, (in), (ch), (code) },
#define CHAR_TBL_START static struct ln lines[LINES_MAX] = {
#define CHAR_TBL_END };
#include "chars.in"
struct mchars {
struct ln **htab;
};
static const struct ln *find(const struct mchars *,
const char *, size_t);
void
mchars_free(struct mchars *arg)
{
free(arg->htab);
free(arg);
}
struct mchars *
mchars_alloc(void)
{
struct mchars *tab;
struct ln **htab;
struct ln *pp;
int i, hash;
/*
* Constructs a very basic chaining hashtable. The hash routine
* is simply the integral value of the first character.
* Subsequent entries are chained in the order they're processed.
*/
tab = mandoc_malloc(sizeof(struct mchars));
htab = mandoc_calloc(PRINT_HI - PRINT_LO + 1, sizeof(struct ln *));
for (i = 0; i < LINES_MAX; i++) {
hash = (int)lines[i].code[0] - PRINT_LO;
if (NULL == (pp = htab[hash])) {
htab[hash] = &lines[i];
continue;
}
for ( ; pp->next; pp = pp->next)
/* Scan ahead. */ ;
pp->next = &lines[i];
}
tab->htab = htab;
return(tab);
}
int
mchars_spec2cp(const struct mchars *arg, const char *p, size_t sz)
{
const struct ln *ln;
ln = find(arg, p, sz);
return(ln != NULL ? ln->unicode : sz == 1 ? (unsigned char)*p : -1);
}
int
mchars_num2char(const char *p, size_t sz)
{
int i;
i = mandoc_strntoi(p, sz, 10);
return(i >= 0 && i < 256 ? i : -1);
}
int
mchars_num2uc(const char *p, size_t sz)
{
int i;
i = mandoc_strntoi(p, sz, 16);
assert(i >= 0 && i <= 0x10FFFF);
return(i);
}
const char *
mchars_spec2str(const struct mchars *arg,
const char *p, size_t sz, size_t *rsz)
{
const struct ln *ln;
ln = find(arg, p, sz);
if (ln == NULL) {
*rsz = 1;
return(sz == 1 ? p : NULL);
}
*rsz = strlen(ln->ascii);
return(ln->ascii);
}
const char *
mchars_uc2str(int uc)
{
int i;
for (i = 0; i < LINES_MAX; i++)
if (uc == lines[i].unicode)
return(lines[i].ascii);
return("<?>");
}
static const struct ln *
find(const struct mchars *tab, const char *p, size_t sz)
{
const struct ln *pp;
int hash;
assert(p);
if (0 == sz || p[0] < PRINT_LO || p[0] > PRINT_HI)
return(NULL);
hash = (int)p[0] - PRINT_LO;
for (pp = tab->htab[hash]; pp; pp = pp->next)
if (0 == strncmp(pp->code, p, sz) &&
'\0' == pp->code[(int)sz])
return(pp);
return(NULL);
}
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