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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
* CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
* COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
* SOFTWARE IS DISCLAIMED.
*
*
* $Id$
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <malloc.h>
#include <string.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/param.h>
static inline int write_key_value(int fd, char *key, char *value)
{
char *str;
size_t size;
int err = 0;
size = strlen(key) + strlen(value) + 2;
str = malloc(size + 1);
if (!str)
return ENOMEM;
sprintf(str, "%s %s\n", key, value);
if (write(fd, str, size) < 0)
err = errno;
free(str);
return err;
}
int textfile_put(char *pathname, char *key, char *value)
{
struct stat st;
char *map, *off, *end, *str;
off_t size, pos; size_t base, len;
int fd, err = 0;
fd = open(pathname, O_RDWR);
if (fd < 0)
return -errno;
if (flock(fd, LOCK_EX) < 0) {
err = errno;
goto close;
}
if (fstat(fd, &st) < 0) {
err = errno;
goto unlock;
}
size = st.st_size;
if (!size) {
pos = lseek(fd, size, SEEK_SET);
err = write_key_value(fd, key, value);
goto unlock;
}
map = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED, fd, 0);
if (map == MAP_FAILED) {
err = errno;
goto unlock;
}
off = strstr(map, key);
if (!off) {
munmap(map, size);
pos = lseek(fd, size, SEEK_SET);
err = write_key_value(fd, key, value);
goto unlock;
}
if (off > map) {
while (*(off - 1) != '\r' && *(off - 1) != '\n') {
off = strstr(off, key);
if (!off) {
munmap(map, size);
pos = lseek(fd, size, SEEK_SET);
err = write_key_value(fd, key, value);
goto unlock;
}
}
}
base = off - map;
end = strpbrk(off, "\r\n");
if (!end) {
err = EILSEQ;
goto unmap;
}
len = strspn(end, "\r\n");
end += len;
len = size - (end - map);
if (len <= 0 || len > size) {
err = EILSEQ;
goto unmap;
}
str = malloc(len);
if (!str) {
err = errno;
goto unmap;
}
memcpy(str, end, len);
munmap(map, size);
ftruncate(fd, base);
pos = lseek(fd, base, SEEK_SET);
write_key_value(fd, key, value);
write(fd, str, len);
free(str);
goto unlock;
unmap:
munmap(map, size);
unlock:
flock(fd, LOCK_UN);
close:
close(fd);
errno = err;
return -err;
}
char *textfile_get(char *pathname, char *key)
{
struct stat st;
char *map, *off, *end, *str = NULL;
off_t size; size_t len;
int fd, err = 0;
fd = open(pathname, O_RDONLY);
if (fd < 0)
return NULL;
if (flock(fd, LOCK_SH) < 0) {
err = errno;
goto close;
}
if (fstat(fd, &st) < 0) {
err = errno;
goto unlock;
}
size = st.st_size;
map = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
if (map == MAP_FAILED) {
err = errno;
goto unlock;
}
off = strstr(map, key);
if (!off) {
err = EILSEQ;
goto unmap;
}
if (off > map) {
while (*(off - 1) != '\r' && *(off - 1) != '\n') {
off = strstr(off, key);
if (!off) {
err = EILSEQ;
goto unmap;
}
}
}
end = strpbrk(off, "\r\n");
if (!end) {
err = EILSEQ;
goto unmap;
}
len = strlen(key);
str = malloc(end - off - len);
if (!str) {
err = EILSEQ;
goto unmap;
}
memset(str, 0, end - off - len);
strncpy(str, off + len + 1, end - off - len - 1);
unmap:
munmap(map, size);
unlock:
flock(fd, LOCK_UN);
close:
close(fd);
errno = err;
return str;
}
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