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/* $OpenBSD: test___freadptr.c,v 1.1 2025/05/25 00:20:54 yasuoka Exp $ */
/*
* Copyright (c) 2025 YASUOKA Masahiko <yasuoka@yasuoka.net>
*
* 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 <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
/* we use assert() */
#undef NDEBUG
#define TMPFILENAME "test___freadptr.tmp"
void test___freadptr0(void);
/* test __freadptr() and __freadptrinc() */
void
test___freadptr0(void)
{
FILE *fp;
int r;
ssize_t s;
const char *p;
fp = fopen(TMPFILENAME, "w");
assert(fp != NULL);
r = fputs("Hello world", fp);
assert(r >= 0);
r = fclose(fp);
fp = fopen(TMPFILENAME, "r");
assert(fgetc(fp) == 'H');
p = __freadptr(fp, &s);
assert(p != NULL);
assert(s > 4); /* this test assume this (not by the spec) */
assert(*p == 'e');
assert(strncmp(p, "ello world", s) == 0);
__freadptrinc(fp, 4);
assert(fgetc(fp) == ' ');
ungetc('A', fp);
ungetc('A', fp);
ungetc('A', fp);
p = __freadptr(fp, &s);
assert(s > 0);
assert(*p == 'A');
/* ptr will contains only the pushback buffer */
assert(strncmp(p, "AAAworld", s) == 0);
r = fclose(fp);
assert(r == 0);
}
int
main(int argc, char *argv[])
{
test___freadptr0();
exit(0);
}
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