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125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/* getdelim.c --- Implementation of replacement getdelim function.
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* Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005, 2006, 2007,
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* 2008, 2009 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 3, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA. */
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/* Ported from glibc by Simon Josefsson. */
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#include "compat.h"
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#include <stdio.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <errno.h>
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#ifndef SSIZE_MAX
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# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
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#endif
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#if USE_UNLOCKED_IO
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# include "unlocked-io.h"
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# define getc_maybe_unlocked(fp) getc (fp)
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#elif ! HAVE_FLOCKFILE || ! HAVE_FUNLOCKFILE || ! HAVE_DECL_GETC_UNLOCKED
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# undef flockfile
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# undef funlockfile
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# define flockfile(x) ((void) 0)
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# define funlockfile(x) ((void) 0)
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# define getc_maybe_unlocked(fp) getc (fp)
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#else
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# define getc_maybe_unlocked(fp) getc_unlocked (fp)
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#endif
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/* Read up to (and including) a DELIMITER from FP into *LINEPTR (and
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* NUL-terminate it). *LINEPTR is a pointer returned from malloc (or
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* NULL), pointing to *N characters of space. It is realloc'ed as
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* necessary. Returns the number of characters read (not including
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* the null terminator), or -1 on error or EOF. */
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ssize_t
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getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
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{
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ssize_t result = -1;
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size_t cur_len = 0;
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if (lineptr == NULL || n == NULL || fp == NULL) {
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errno = EINVAL;
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return -1;
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}
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flockfile (fp);
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if (*lineptr == NULL || *n == 0) {
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char *new_lineptr;
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*n = 120;
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new_lineptr = (char *) realloc (*lineptr, *n);
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if (new_lineptr == NULL) {
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result = -1;
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goto unlock_return;
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}
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*lineptr = new_lineptr;
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}
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for (;;) {
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int i;
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i = getc_maybe_unlocked (fp);
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if (i == EOF) {
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result = -1;
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break;
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}
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/* Make enough space for len+1 (for final NUL) bytes. */
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if (cur_len + 1 >= *n) {
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size_t needed_max =
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SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;
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size_t needed = 2 * *n + 1; /* Be generous. */
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char *new_lineptr;
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if (needed_max < needed)
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needed = needed_max;
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if (cur_len + 1 >= needed) {
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result = -1;
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errno = EOVERFLOW;
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goto unlock_return;
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}
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new_lineptr = (char *) realloc (*lineptr, needed);
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if (new_lineptr == NULL) {
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result = -1;
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goto unlock_return;
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}
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*lineptr = new_lineptr;
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*n = needed;
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}
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(*lineptr)[cur_len] = i;
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cur_len++;
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if (i == delimiter)
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break;
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}
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(*lineptr)[cur_len] = '\0';
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result = cur_len ? (ssize_t) cur_len : result;
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unlock_return:
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funlockfile (fp); /* doesn't set errno */
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return result;
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}
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