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/* $Id: chars.c,v 1.20 2011/05/29 21:26:57 schwarze Exp $ */
/*
* Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2011 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 <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mandoc.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 325
#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 inline int match(const struct ln *, const char *, size_t);
static const struct ln *find(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
* (they're in-line re-ordered during lookup).
*/
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);
}
/*
* Special character to Unicode codepoint.
*/
int
mchars_spec2cp(struct mchars *arg, const char *p, size_t sz)
{
const struct ln *ln;
ln = find(arg, p, sz);
if (NULL == ln)
return(-1);
return(ln->unicode);
}
/*
* Numbered character string to ASCII codepoint.
* This can only be a printable character (i.e., alnum, punct, space) so
* prevent the character from ruining our state (backspace, newline, and
* so on).
* If the character is illegal, returns '\0'.
*/
char
mchars_num2char(const char *p, size_t sz)
{
int i;
if ((i = mandoc_strntou(p, sz, 10)) < 0)
return('\0');
return(i > 0 && i < 256 && isprint(i) ? i : '\0');
}
/*
* Hex character string to Unicode codepoint.
* If the character is illegal, returns '\0'.
*/
int
mchars_num2uc(const char *p, size_t sz)
{
int i;
if ((i = mandoc_strntou(p, sz, 16)) < 0)
return('\0');
/* FIXME: make sure we're not in a bogus range. */
return(i > 0x80 && i <= 0x10FFFF ? i : '\0');
}
/*
* Special character to string array.
*/
const char *
mchars_spec2str(struct mchars *arg, const char *p, size_t sz, size_t *rsz)
{
const struct ln *ln;
ln = find(arg, p, sz);
if (NULL == ln) {
*rsz = 1;
return(NULL);
}
*rsz = strlen(ln->ascii);
return(ln->ascii);
}
static const struct ln *
find(struct mchars *tab, const char *p, size_t sz)
{
struct ln *pp, *prev;
struct ln **htab;
int hash;
assert(p);
if (0 == sz)
return(NULL);
if (p[0] < PRINT_LO || p[0] > PRINT_HI)
return(NULL);
/*
* Lookup the symbol in the symbol hash. See ascii2htab for the
* hashtable specs. This dynamically re-orders the hash chain
* to optimise for repeat hits.
*/
hash = (int)p[0] - PRINT_LO;
htab = tab->htab;
if (NULL == (pp = htab[hash]))
return(NULL);
for (prev = NULL; pp; pp = pp->next) {
if ( ! match(pp, p, sz)) {
prev = pp;
continue;
}
if (prev) {
prev->next = pp->next;
pp->next = htab[hash];
htab[hash] = pp;
}
return(pp);
}
return(NULL);
}
static inline int
match(const struct ln *ln, const char *p, size_t sz)
{
if (strncmp(ln->code, p, sz))
return(0);
return('\0' == ln->code[(int)sz]);
}
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