70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/* safe-fgets.c --- like fgets, but allocates its own static buffer.
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Copyright (C) 2005-2020 Free Software Foundation, Inc.
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Contributed by Red Hat, Inc.
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This file is part of the GNU simulators.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "safe-fgets.h"
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static char *line_buf = 0;
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static int line_buf_size = 0;
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#define LBUFINCR 100
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char *
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safe_fgets (FILE * f)
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{
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char *line_ptr;
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if (line_buf == 0)
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{
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line_buf = (char *) malloc (LBUFINCR);
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line_buf_size = LBUFINCR;
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}
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/* points to last byte */
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line_ptr = line_buf + line_buf_size - 1;
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/* so we can see if fgets put a 0 there */
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*line_ptr = 1;
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if (fgets (line_buf, line_buf_size, f) == 0)
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return 0;
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/* we filled the buffer? */
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while (line_ptr[0] == 0 && line_ptr[-1] != '\n')
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{
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/* Make the buffer bigger and read more of the line */
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line_buf_size += LBUFINCR;
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line_buf = (char *) realloc (line_buf, line_buf_size);
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/* points to last byte again */
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line_ptr = line_buf + line_buf_size - 1;
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/* so we can see if fgets put a 0 there */
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*line_ptr = 1;
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if (fgets (line_buf + line_buf_size - LBUFINCR - 1, LBUFINCR + 1, f) ==
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0)
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return 0;
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}
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return line_buf;
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}
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