1 files changed, 35 insertions, 0 deletions
diff --git a/base/util_strlcat.c b/base/util_strlcat.c
new file mode 100644
index 00000000..c659b73a
--- /dev/null
+++ b/base/util_strlcat.c
@@ -0,0 +1,35 @@
+/* Appends src to string dst of size siz (unlike strncat, siz is the
+ * full size of dst, not space left). At most siz-1 characters
+ * will be copied.  Always NUL terminates (unless siz == 0).
+ * Returns strlen(src); if retval >= siz, truncation occurred.
+ */
+
+#include <string.h>
+
+int strlcat(char *dst, const char *src, int siz)
+{
+	register char *d = dst;
+	register const char *s = src;
+	register int n = siz;
+	int dlen;
+
+	/* Find the end of dst and adjust bytes left but don't go past end */
+	while (*d != '\0' && n-- != 0)
+		d++;
+	dlen = d - dst;
+	n = siz - dlen;
+
+	if (n == 0)
+		return dlen + strlen(s);
+	while (*s != '\0') {
+		if (n != 1) {
+			*d++ = *s;
+			n--;
+		}
+		s++;
+	}
+	*d = '\0';
+
+	return dlen + (s - src);	/* count does not include NUL */
+}
+