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/* safe-fgets.c --- like fgets, but allocates its own static buffer.
Copyright (C) 2005-2018 Free Software Foundation, Inc.
Contributed by Red Hat, Inc.
This file is part of the GNU simulators.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <stdlib.h>
#include "safe-fgets.h"
static char *line_buf = 0;
static int line_buf_size = 0;
#define LBUFINCR 100
char *
safe_fgets (FILE * f)
{
char *line_ptr;
if (line_buf == 0)
{
line_buf = (char *) malloc (LBUFINCR);
line_buf_size = LBUFINCR;
}
/* points to last byte */
line_ptr = line_buf + line_buf_size - 1;
/* so we can see if fgets put a 0 there */
*line_ptr = 1;
if (fgets (line_buf, line_buf_size, f) == 0)
return 0;
/* we filled the buffer? */
while (line_ptr[0] == 0 && line_ptr[-1] != '\n')
{
/* Make the buffer bigger and read more of the line */
line_buf_size += LBUFINCR;
line_buf = (char *) realloc (line_buf, line_buf_size);
/* points to last byte again */
line_ptr = line_buf + line_buf_size - 1;
/* so we can see if fgets put a 0 there */
*line_ptr = 1;
if (fgets (line_buf + line_buf_size - LBUFINCR - 1, LBUFINCR + 1, f) ==
0)
return 0;
}
return line_buf;
}
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