70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/* safe-fgets.c --- like fgets, but allocates its own static buffer.
|
|
|
|
Copyright (C) 2005-2015 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;
|
|
}
|