Add str[r]n[case]str and str[n][case]cmpnul

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 23 insertions, 0 deletions

diff --git a/strrnstr.c b/strrnstr.c
new file mode 100644
index 0000000..6a7b06e
--- /dev/null
+++ b/strrnstr.c
@@ -0,0 +1,23 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+
+
+char *
+libsimple_strrnstr(const char *h_, const char *n, size_t len)
+{
+	char *h = *(char **)(void *)&h_;
+	size_t hn = strlen(h);
+	size_t nn = strlen(n);
+	hn = MIN(hn, len);
+	nn = MIN(nn, len);
+	if (!nn)
+		return &h[hn];
+	if (hn < nn)
+		return NULL;
+	for (h += hn -= nn; hn--; h--)
+		if (!strncmp(h, n, nn))
+			return h;
+	if (!strncmp(h, n, nn))
+		return h;
+	return NULL;
+}