util.c: move strlcat and strlcpy into a separate "util.c" object

Signed-off-by: Jeff Layton <jlayton@redhat.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/util.c b/util.c
new file mode 100644
index 0000000..00e0cc5
--- /dev/null
+++ b/util.c
@@ -0,0 +1,47 @@
+#include <sys/types.h>
+#include <string.h>
+
+/* glibc doesn't have strlcpy, strlcat. Ensure we do. JRA. We
+ * don't link to libreplace so need them here. */
+
+/* like strncpy but does not 0 fill the buffer and always null
+ *    terminates. bufsize is the size of the destination buffer */
+
+#ifndef HAVE_STRLCPY
+size_t strlcpy(char *d, const char *s, size_t bufsize)
+{
+	size_t len = strlen(s);
+	size_t ret = len;
+	if (bufsize <= 0) return 0;
+	if (len >= bufsize) len = bufsize-1;
+	memcpy(d, s, len);
+	d[len] = 0;
+	return ret;
+}
+#endif
+
+/* like strncat but does not 0 fill the buffer and always null
+ *    terminates. bufsize is the length of the buffer, which should
+ *       be one more than the maximum resulting string length */
+
+#ifndef HAVE_STRLCAT
+size_t strlcat(char *d, const char *s, size_t bufsize)
+{
+	size_t len1 = strlen(d);
+	size_t len2 = strlen(s);
+	size_t ret = len1 + len2;
+
+	if (len1+len2 >= bufsize) {
+		if (bufsize < (len1+1)) {
+			return ret;
+		}
+		len2 = bufsize - (len1+1);
+	}
+	if (len2 > 0) {
+		memcpy(d+len1, s, len2);
+		d[len1+len2] = 0;
+	}
+	return ret;
+}
+#endif
+