Add the textfile library for ASCII based file access

1 files changed, 100 insertions, 0 deletions

diff --git a/common/textfile.c b/common/textfile.c
new file mode 100644
index 00000000..6f84cfa9
--- /dev/null
+++ b/common/textfile.c
@@ -0,0 +1,100 @@
+/*
+ *
+ *  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>
+
+char *textfile_get(const char *pathname, const char *key)
+{
+	struct stat st;
+	char *map, *off, *end, *str = NULL;
+	off_t size; size_t len;
+	int fd;
+
+	fd = open(pathname, O_RDONLY);
+	if (fd < 0)
+		return NULL;
+
+	if (flock(fd, LOCK_SH) < 0)
+		goto close;
+
+	if (fstat(fd, &st) < 0)
+		goto unlock;
+
+	size = st.st_size;
+
+	map = mmap(0, size, PROT_READ, MAP_SHARED, fd, 0);
+	if (map == MAP_FAILED)
+		goto close;
+
+	off = strstr(map, key);
+	if (!off)
+		goto unmap;
+
+	if (off > map) {
+		while (*(off - 1) != '\r' && *(off - 1) != '\n') {
+			off = strstr(map, key);
+			if (!off)
+				goto unmap;
+		}
+	}
+
+	end = strpbrk(off, "\r\n");
+	if (!end)
+		goto unmap;
+
+	len = strlen(key);
+	str = malloc(end - off - len);
+	memset(str, 0, end - off - len);
+	if (!str)
+		goto unmap;
+
+	strncpy(str, off + len + 1, end - off - len - 1);
+
+unmap:
+	munmap(map, size);
+
+unlock:
+	flock(fd, LOCK_UN);
+
+close:
+	close(fd);
+
+	return str;
+}