/* getdelim.c --- Implementation of replacement getdelim function.
- Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005 Free
- Software Foundation, Inc.
+ Copyright (C) 1994, 1996-1998, 2001, 2003, 2005-2011 Free Software
+ Foundation, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
/* Ported from glibc by Simon Josefsson. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
+
+/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
+ optimizes away the lineptr == NULL || n == NULL || fp == NULL tests below. */
+#define _GL_ARG_NONNULL(params)
+#include <stdio.h>
+
+#include <limits.h>
+#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
-#include "getdelim.h"
+#ifndef SSIZE_MAX
+# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
+#endif
-#if !HAVE_FLOCKFILE
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
+# define getc_maybe_unlocked(fp) getc(fp)
+#elif !HAVE_FLOCKFILE || !HAVE_FUNLOCKFILE || !HAVE_DECL_GETC_UNLOCKED
# undef flockfile
-# define flockfile(x) ((void) 0)
-#endif
-#if !HAVE_FUNLOCKFILE
# undef funlockfile
+# define flockfile(x) ((void) 0)
# define funlockfile(x) ((void) 0)
+# define getc_maybe_unlocked(fp) getc(fp)
+#else
+# define getc_maybe_unlocked(fp) getc_unlocked(fp)
#endif
/* Read up to (and including) a DELIMITER from FP into *LINEPTR (and
ssize_t
getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
{
- int result = 0;
- ssize_t cur_len = 0;
+ ssize_t result;
+ size_t cur_len = 0;
if (lineptr == NULL || n == NULL || fp == NULL)
{
if (*lineptr == NULL || *n == 0)
{
+ char *new_lineptr;
*n = 120;
- *lineptr = (char *) malloc (*n);
- if (*lineptr == NULL)
- {
- result = -1;
- goto unlock_return;
- }
+ new_lineptr = (char *) realloc (*lineptr, *n);
+ if (new_lineptr == NULL)
+ {
+ result = -1;
+ goto unlock_return;
+ }
+ *lineptr = new_lineptr;
}
for (;;)
{
int i;
- i = getc (fp);
+ i = getc_maybe_unlocked (fp);
if (i == EOF)
- {
- result = -1;
- break;
- }
+ {
+ result = -1;
+ break;
+ }
/* Make enough space for len+1 (for final NUL) bytes. */
if (cur_len + 1 >= *n)
- {
- size_t needed = 2 * (cur_len + 1) + 1; /* Be generous. */
- char *new_lineptr;
-
- if (needed < cur_len)
- {
- result = -1;
- goto unlock_return;
- }
-
- new_lineptr = (char *) realloc (*lineptr, needed);
- if (new_lineptr == NULL)
- {
- result = -1;
- goto unlock_return;
- }
-
- *lineptr = new_lineptr;
- *n = needed;
- }
+ {
+ size_t needed_max =
+ SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;
+ size_t needed = 2 * *n + 1; /* Be generous. */
+ char *new_lineptr;
+
+ if (needed_max < needed)
+ needed = needed_max;
+ if (cur_len + 1 >= needed)
+ {
+ result = -1;
+ errno = EOVERFLOW;
+ goto unlock_return;
+ }
+
+ new_lineptr = (char *) realloc (*lineptr, needed);
+ if (new_lineptr == NULL)
+ {
+ result = -1;
+ goto unlock_return;
+ }
+
+ *lineptr = new_lineptr;
+ *n = needed;
+ }
(*lineptr)[cur_len] = i;
cur_len++;
if (i == delimiter)
- break;
+ break;
}
(*lineptr)[cur_len] = '\0';
result = cur_len ? cur_len : result;
unlock_return:
- funlockfile (fp);
+ funlockfile (fp); /* doesn't set errno */
+
return result;
}