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/*
test-str-source.c - Sample program for using reguexec()
Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi>.
This software is free; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This software is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this software; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "regex.h"
#define elementsof(x) ( sizeof(x) / sizeof(x[0]) )
/* Context structure for the tre_str_source wrappers. */
typedef struct {
/* Our string. */
const char *str;
/* Current position in the string. */
size_t pos;
} str_handler_ctx;
/* The get_next_char() handler. Sets `c' to the value of the next character,
and increases `pos_add' by the number of bytes read. Returns 1 if the
string has ended, 0 if there are more characters. */
static int
str_handler_get_next(tre_char_t *c, unsigned int *pos_add, void *context)
{
str_handler_ctx *ctx = context;
unsigned char ch = ctx->str[ctx->pos];
printf("str[%lu] = %d\n", (unsigned long)ctx->pos, ch);
*c = ch;
if (ch)
ctx->pos++;
*pos_add = 1;
return c == '\0';
}
/* The rewind() handler. Resets the current position in the input string. */
static void
str_handler_rewind(size_t pos, void *context)
{
str_handler_ctx *ctx = context;
printf("rewind to %lu\n", (unsigned long)pos);
ctx->pos = pos;
}
/* The compare() handler. Compares two substrings in the input and returns
0 if the substrings are equal, and a nonzero value if not. */
static int
str_handler_compare(size_t pos1, size_t pos2, size_t len, void *context)
{
str_handler_ctx *ctx = context;
printf("comparing %lu-%lu and %lu-%lu\n",
(unsigned long)pos1, (unsigned long)pos1 + len,
(unsigned long)pos2, (unsigned long)pos2 + len);
return strncmp(ctx->str + pos1, ctx->str + pos2, len);
}
/* Creates a tre_str_source wrapper around the string `str'. Returns the
tre_str_source object or NULL if out of memory. */
static tre_str_source *
make_str_source(const char *str)
{
tre_str_source *s;
str_handler_ctx *ctx;
s = calloc(1, sizeof(*s));
if (!s)
return NULL;
ctx = malloc(sizeof(str_handler_ctx));
if (!ctx)
{
free(s);
return NULL;
}
ctx->str = str;
ctx->pos = 0;
s->context = ctx;
s->get_next_char = str_handler_get_next;
s->rewind = str_handler_rewind;
s->compare = str_handler_compare;
return s;
}
/* Frees the memory allocated for `s'. */
static void
free_str_source(tre_str_source *s)
{
free(s->context);
free(s);
}
int
main(int argc, char **argv)
{
regex_t preg;
tre_str_source *source;
regmatch_t pmatch[5];
source = make_str_source("xfoofofoofoo");
if (!source)
return 1;
regcomp(&preg, "(foo)\\1", REG_EXTENDED);
if (reguexec(&preg, source, elementsof(pmatch), pmatch, 0) == 0)
printf("Match: %d - %d\n", (int)pmatch[0].rm_so, (int)pmatch[0].rm_eo);
free_str_source(source);
return 0;
}
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