gsmd: add strlcpy, strlcat functions (Paulius Zaleckas)

git-svn-id: http://svn.openmoko.org/trunk/src/target/gsm@4060 99fdad57-331a-0410-800a-d7fa5415bdb3

1 files changed, 86 insertions, 0 deletions

diff --git a/src/gsmd/strl.c b/src/gsmd/strl.c
new file mode 100644
index 0000000..cf20ef0
--- /dev/null
+++ b/src/gsmd/strl.c
@@ -0,0 +1,86 @@
+/* safe strcpy and strcat versions
+ *
+ * Copyright (C) 1991, 1992  Linus Torvalds
+ * Copyright (C) 2008 by Paulius Zaleckas, JSC Teltonika
+ * All Rights Reserved
+ *
+ * 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 <string.h>
+
+#include "gsmd.h"
+#include <gsmd/gsmd.h>
+
+/**
+ * strlcpy - Copy a %NUL terminated string into a sized buffer
+ * @dest: Where to copy the string to
+ * @src: Where to copy the string from
+ * @size: size of destination buffer
+ *
+ * Compatible with *BSD: the result is always a valid
+ * NUL-terminated string that fits in the buffer (unless,
+ * of course, the buffer size is zero). It does not pad
+ * out the result like strncpy() does.
+ */
+size_t strlcpy(char *dest, const char *src, size_t size)
+{
+	size_t ret = strlen(src);
+
+	if (size) {
+		size_t len;
+		if (ret >= size) {
+			len = size - 1;
+			DEBUGP("\"%s\" was truncated by %i characters\n", src,
+			       ret - len);
+		}
+		else
+			len = ret;
+		memcpy(dest, src, len);
+		dest[len] = '\0';
+	}
+	return ret;
+}
+
+/**
+ * strlcat - Append a length-limited, %NUL-terminated string to another
+ * @dest: The string to be appended to
+ * @src: The string to append to it
+ * @count: The size of the destination buffer.
+ */
+size_t strlcat(char *dest, const char *src, size_t count)
+{
+	size_t dsize = strlen(dest);
+	size_t len = strlen(src);
+	size_t res = dsize + len;
+
+	/* This would be a bug */
+	if (dsize >= count) {
+		DEBUGP("Length of destination string > provided buffer size!\n");
+		return 0;
+	}
+
+	dest += dsize;
+	count -= dsize;
+	if (len >= count) {
+		len = count - 1;
+		DEBUGP("\"%s\" was truncated by %i characters\n", src,
+		       res - len);
+	}
+	memcpy(dest, src, len);
+	dest[len] = 0;
+	return res;
+}
+