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/*
test-str-source.c - Sample program for using tre_reguexec()
This software is released under a BSD-style license.
See the file LICENSE for details and copyright.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* look for getopt in order to use a -o option for output. */
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#elif defined(HAVE_GETOPT_H)
#include <getopt.h>
#endif
#include "tre-internal.h"
static FILE *outf = NULL;
/* 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];
#ifdef TRE_DEBUG
fprintf(outf, "str[%lu] = %d\n", (unsigned long)ctx->pos, ch);
#endif /* TRE_DEBUG */
*c = ch;
if (ch)
ctx->pos++;
*pos_add = 1;
return ch == '\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;
#ifdef TRE_DEBUG
fprintf(outf, "rewind to %lu\n", (unsigned long)pos);
#endif /* TRE_DEBUG */
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;
#ifdef TRE_DEBUG
fprintf(outf, "comparing %lu-%lu and %lu-%lu\n",
(unsigned long)pos1, (unsigned long)pos1 + len,
(unsigned long)pos2, (unsigned long)pos2 + len);
#endif /* TRE_DEBUG */
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);
}
/* Run one test with tre_reguexec. Returns 1 if the regex matches, 0 if
it doesn't, and -1 if an error occurs. */
static int
test_reguexec(const char *str, const char *regex)
{
regex_t preg;
tre_str_source *source;
regmatch_t pmatch[5];
int ret;
if ((source = make_str_source(str)) == NULL)
{
fprintf(stderr, "Out of memory\n");
ret = -1;
}
else
{
if (tre_regcomp(&preg, regex, REG_EXTENDED) != REG_OK)
{
fprintf(stderr, "Failed to compile /%s/\n", regex);
ret = -1;
}
else
{
if (tre_reguexec(&preg, source, elementsof(pmatch), pmatch, 0) == 0)
{
fprintf(outf, "Match: /%s/ matches \"%.*s\" in \"%s\"\n", regex,
(int)(pmatch[0].rm_eo - pmatch[0].rm_so),
str + pmatch[0].rm_so, str);
ret = 1;
}
else
{
fprintf(outf, "No match: /%s/ in \"%s\"\n", regex, str);
ret = 0;
}
tre_regfree(&preg);
}
free_str_source(source);
}
return ret;
}
int
main(int argc, char **argv)
{
int ret = 0;
outf = stdout;
#if defined(HAVE_UNISTD_H) || defined(HAVE_GETOPT_H)
int opt;
while ((opt = getopt(argc, argv, "o:")) != EOF)
{
switch (opt)
{
case 'o':
if ((outf = fopen(optarg, "w")) == NULL)
{
perror(optarg);
exit(1);
}
break;
default:
/* getopt() will have printed an error message already */
exit(1);
}
}
#endif
ret += test_reguexec("xfoofofoofoo", "(foo)\\1") != 1;
ret += test_reguexec("catcat", "(cat|dog)\\1") != 1;
ret += test_reguexec("catdog", "(cat|dog)\\1") != 0;
ret += test_reguexec("dogdog", "(cat|dog)\\1") != 1;
ret += test_reguexec("dogcat", "(cat|dog)\\1") != 0;
return ret;
}
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