/* $NetBSD: fgetln.c,v 1.12 2015/10/09 14:42:40 christos Exp $ */
/*
* Copyright (c) 2015 Joerg Jung <
[email protected]>
*
* 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.
*/
/*
* portable fgetln() version
*/
#ifdef HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#if !HAVE_FGETLN
#include <stdlib.h>
#ifndef HAVE_NBTOOL_CONFIG_H
/* These headers are required, but included from nbtool_config.h */
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#endif
char *
fgetln(FILE *fp, size_t *len)
{
static char *buf = NULL;
static size_t bufsz = 0;
size_t r = 0;
char *p;
int c, e;
if (!fp || !len) {
errno = EINVAL;
return NULL;
}
if (!buf) {
if (!(buf = calloc(1, BUFSIZ)))
return NULL;
bufsz = BUFSIZ;
}
while ((c = getc(fp)) != EOF) {
buf[r++] = c;
if (r == bufsz) {
/*
* Original uses reallocarray() but we don't have it
* in tools.
*/
if (!(p = realloc(buf, 2 * bufsz))) {
e = errno;
free(buf);
errno = e;
buf = NULL, bufsz = 0;
return NULL;
}
buf = p, bufsz = 2 * bufsz;
}
if (c == '\n')
break;
}
return (*len = r) ? buf : NULL;
}
#endif
#ifdef TEST
int
main(int argc, char *argv[])
{
char *p;
size_t len;
while ((p = fgetln(stdin, &len)) != NULL) {
(void)printf("%zu %s", len, p);
free(p);
}
return 0;
}
#endif
