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/* -*- c-file-style: "java"; indent-tabs-mode: nil; tab-width: 4; fill-column: 78 -*-
*
* distcc -- A simple distributed compiler system
*
* Copyright (C) 2003 by Martin Pool <mbp@samba.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, 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 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.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "distcc.h"
#include "trace.h"
#include "util.h"
#include "exitcode.h"
/**
* Load a whole file into a new string in a malloc'd memory buffer.
*
* Files larger than a certain reasonableness limit are not loaded, because
* this is only used for reasonably short text files.
*
* Files that do not exist cause EXIT_NO_SUCH_FILE, but no error message.
* (This suits our case of loading configuration files. It could be made
* optional.)
**/
int dcc_load_file_string(const char *filename,
char **retbuf)
{
int fd;
int ret;
ssize_t read_bytes;
struct stat sb;
char *buf;
/* Open the file */
if ((fd = open(filename, O_RDONLY)) == -1) {
if (errno == EEXIST)
return EXIT_NO_SUCH_FILE;
else {
rs_log_warning("failed to open %s: %s", filename,
strerror(errno));
return EXIT_IO_ERROR;
}
}
/* Find out how big the file is */
if (fstat(fd, &sb) == -1) {
rs_log_error("fstat %s failed: %s", filename, strerror(errno));
ret = EXIT_IO_ERROR;
goto out_close;
}
if (sb.st_size > 1<<20) {
rs_log_error("%s is too large to load (%ld bytes)", filename,
(long) sb.st_size);
ret = EXIT_OUT_OF_MEMORY;
goto out_close;
}
/* Allocate a buffer, allowing space for a nul. */
if ((*retbuf = buf = malloc((size_t) sb.st_size + 1)) == NULL) {
rs_log_error("failed to allocate %ld byte file buffer", (long) sb.st_size);
ret = EXIT_OUT_OF_MEMORY;
goto out_close;
}
/* Read everything */
if ((read_bytes = read(fd, buf, (size_t) sb.st_size)) == -1) {
rs_log_error("failed to read %s: %s", filename, strerror(errno));
ret = EXIT_IO_ERROR;
goto out_free;
}
/* Null-terminate. It's OK if we read a bit less than we expected to. */
buf[read_bytes] = '\0';
ret = 0;
out_close:
dcc_close(fd);
return ret;
out_free:
free(*retbuf);
dcc_close(fd);
return ret;
}
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