glibc/support/support_write_file_string.c

40 lines
1.4 KiB
C

/* Write a string to a file.
Copyright (C) 2017-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <fcntl.h>
#include <string.h>
#include <support/check.h>
#include <support/xunistd.h>
void
support_write_file_string (const char *path, const char *contents)
{
int fd = xopen (path, O_CREAT | O_TRUNC | O_WRONLY, 0666);
const char *end = contents + strlen (contents);
for (const char *p = contents; p < end; )
{
ssize_t ret = write (fd, p, end - p);
if (ret < 0)
FAIL_EXIT1 ("cannot write to \"%s\": %m", path);
if (ret == 0)
FAIL_EXIT1 ("zero-length write to \"%s\"", path);
p += ret;
}
xclose (fd);
}