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/* $Id: chars.c,v 1.5 2010/02/18 02:11:25 schwarze Exp $ */
/*
* Copyright (c) 2009 Kristaps Dzonsons <kristaps@kth.se>
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "chars.h"
#define PRINT_HI 126
#define PRINT_LO 32
struct ln {
struct ln *next;
const char *code;
const char *ascii;
const char *html;
size_t codesz;
size_t asciisz;
size_t htmlsz;
int type;
#define CHARS_CHAR (1 << 0)
#define CHARS_STRING (1 << 1)
#define CHARS_BOTH (CHARS_CHAR | CHARS_STRING)
};
#define LINES_MAX 350
#define CHAR(w, x, y, z, a, b) \
{ NULL, (w), (y), (a), (x), (z), (b), CHARS_CHAR },
#define STRING(w, x, y, z, a, b) \
{ NULL, (w), (y), (a), (x), (z), (b), CHARS_STRING },
#define BOTH(w, x, y, z, a, b) \
{ NULL, (w), (y), (a), (x), (z), (b), CHARS_BOTH },
#define CHAR_TBL_START static struct ln lines[LINES_MAX] = {
#define CHAR_TBL_END };
#include "chars.in"
struct tbl {
enum chars type;
struct ln **htab;
};
static inline int match(const struct ln *,
const char *, size_t, int);
static const char *find(struct tbl *, const char *,
size_t, size_t *, int);
void
chars_free(void *arg)
{
struct tbl *tab;
tab = (struct tbl *)arg;
free(tab->htab);
free(tab);
}
void *
chars_init(enum chars type)
{
struct tbl *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 = malloc(sizeof(struct tbl));
if (NULL == tab) {
perror(NULL);
exit(EXIT_FAILURE);
}
htab = calloc(PRINT_HI - PRINT_LO + 1, sizeof(struct ln **));
if (NULL == htab) {
perror(NULL);
exit(EXIT_FAILURE);
}
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;
tab->type = type;
return(tab);
}
const char *
chars_a2ascii(void *arg, const char *p, size_t sz, size_t *rsz)
{
return(find((struct tbl *)arg, p, sz, rsz, CHARS_CHAR));
}
const char *
chars_a2res(void *arg, const char *p, size_t sz, size_t *rsz)
{
return(find((struct tbl *)arg, p, sz, rsz, CHARS_STRING));
}
static const char *
find(struct tbl *tab, const char *p, size_t sz, size_t *rsz, int type)
{
struct ln *pp, *prev;
struct ln **htab;
int hash;
assert(p);
assert(sz > 0);
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, type)) {
prev = pp;
continue;
}
if (prev) {
prev->next = pp->next;
pp->next = htab[hash];
htab[hash] = pp;
}
if (CHARS_HTML == tab->type) {
*rsz = pp->htmlsz;
return(pp->html);
}
*rsz = pp->asciisz;
return(pp->ascii);
}
return(NULL);
}
static inline int
match(const struct ln *ln, const char *p, size_t sz, int type)
{
if ( ! (ln->type & type))
return(0);
if (ln->codesz != sz)
return(0);
return(0 == strncmp(ln->code, p, sz));
}
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