1 files changed, 32 insertions, 0 deletions
diff --git a/strcasechr_inv.c b/strcasechr_inv.c
new file mode 100644
index 0000000..c5ff521
--- /dev/null
+++ b/strcasechr_inv.c
@@ -0,0 +1,32 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+char *
+libsimple_strcasechr_inv(const char *s_, int c) /* TODO man */
+{
+	char *s = *(char **)(void *)&s_, lc = (char)tolower(c), uc = (char)toupper(c);
+	if (lc != uc)
+		for (; *s && (*s == lc || *s == uc); s++);
+	else
+		for (; *s && *s == lc; s++);
+	return *s ? s : NULL;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	assert(!strcmpnul(libsimple_strcasechr_inv("xxoxx", 'x'), "oxx"));
+	assert(!strcmpnul(libsimple_strcasechr_inv("xxXxx", 'x'), NULL));
+	assert(!strcmpnul(libsimple_strcasechr_inv("XXoxx", 'x'), "oxx"));
+	assert(!strcmpnul(libsimple_strcasechr_inv("zzzzz", 'z'), NULL));
+	assert(!strcmpnul(libsimple_strcasechr_inv("", '\0'), NULL));
+	return 0;
+}
+
+#endif