libvirt/gnulib/lib/getdelim.c

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/* getdelim.c --- Implementation of replacement getdelim function.
update from gnulib * gnulib/lib/inet_ntop.h: Remove file. * gnulib/m4/onceonly_2_57.m4: Remove file. * build-aux/useless-if-before-free: Update. * build-aux/vc-list-files: Update. * gnulib/lib/.cvsignore: Update. * gnulib/lib/Makefile.am: Update. * gnulib/lib/fseeko.c: Update. * gnulib/lib/getaddrinfo.c: Update. * gnulib/lib/getdelim.c: Update. * gnulib/lib/inet_ntop.c: Update. * gnulib/lib/inet_ntop.h: Update. * gnulib/lib/poll.c: Update. * gnulib/lib/snprintf.c: Update. * gnulib/lib/stdlib.in.h: Update. * gnulib/lib/string.in.h: Update. * gnulib/lib/sys_socket.in.h: Update. * gnulib/lib/sys_stat.in.h: Update. * gnulib/lib/vasnprintf.c: Update. * gnulib/lib/vasprintf.c: Update. * gnulib/lib/wchar.in.h: Update. * gnulib/m4/arpa_inet_h.m4: Update. * gnulib/m4/extensions.m4: Update. * gnulib/m4/gnulib-common.m4: Update. * gnulib/m4/gnulib-comp.m4: Update. * gnulib/m4/include_next.m4: Update. * gnulib/m4/inet_ntop.m4: Update. * gnulib/m4/netinet_in_h.m4: Update. * gnulib/m4/onceonly_2_57.m4: Update. * gnulib/m4/physmem.m4: Update. * gnulib/m4/snprintf.m4: Update. * gnulib/m4/stdint.m4: Update. * gnulib/m4/stdio_h.m4: Update. * gnulib/m4/stdlib_h.m4: Update. * gnulib/m4/string_h.m4: Update. * gnulib/m4/strndup.m4: Update. * gnulib/m4/sys_select_h.m4: Update. * gnulib/m4/sys_socket_h.m4: Update. * gnulib/m4/sys_stat_h.m4: Update. * gnulib/m4/vasnprintf.m4: Update. * gnulib/tests/Makefile.am: Update. * gnulib/tests/test-fseeko.c: Update. * gnulib/tests/test-getaddrinfo.c: Update. * gnulib/tests/test-getdelim.c: Update. * gnulib/tests/test-getline.c: Update. * gnulib/tests/test-lseek.c: Update. * gnulib/tests/test-snprintf.c: Update. * gnulib/tests/test-sys_stat.c: Update. * gnulib/tests/test-vasnprintf.c: Update. * gnulib/tests/test-vasprintf.c: Update.
2008-04-29 19:52:26 +00:00
Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005, 2006, 2007, 2008 Free
Software Foundation, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1, 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 Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. */
/* Ported from glibc by Simon Josefsson. */
#include <config.h>
#include <stdio.h>
#include <limits.h>
#include <stdlib.h>
#include <errno.h>
#ifndef SIZE_MAX
# define SIZE_MAX ((size_t) -1)
#endif
#ifndef SSIZE_MAX
# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
#endif
#if !HAVE_FLOCKFILE
# undef flockfile
# define flockfile(x) ((void) 0)
#endif
#if !HAVE_FUNLOCKFILE
# undef funlockfile
# define funlockfile(x) ((void) 0)
#endif
/* Read up to (and including) a DELIMITER from FP into *LINEPTR (and
NUL-terminate it). *LINEPTR is a pointer returned from malloc (or
NULL), pointing to *N characters of space. It is realloc'ed as
necessary. Returns the number of characters read (not including
the null terminator), or -1 on error or EOF. */
ssize_t
getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
{
ssize_t result;
size_t cur_len = 0;
if (lineptr == NULL || n == NULL || fp == NULL)
{
errno = EINVAL;
return -1;
}
flockfile (fp);
if (*lineptr == NULL || *n == 0)
{
char *new_lineptr;
*n = 120;
new_lineptr = (char *) realloc (*lineptr, *n);
if (new_lineptr == NULL)
{
result = -1;
goto unlock_return;
}
*lineptr = new_lineptr;
}
for (;;)
{
int i;
i = getc (fp);
if (i == EOF)
{
result = -1;
break;
}
/* Make enough space for len+1 (for final NUL) bytes. */
if (cur_len + 1 >= *n)
{
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;
}
(*lineptr)[cur_len] = '\0';
result = cur_len ? cur_len : result;
unlock_return:
funlockfile (fp); /* doesn't set errno */
return result;
}