Implement strcasestr

libsrc/common/strcasestr.c

@@ -0,0 +1,36 @@
+/*
+** strcasestr.c
+**
+** Colin Leroy-Mira, 2024
+*/
+
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+/*****************************************************************************/
+/*                                   Code                                    */
+/*****************************************************************************/
+
+
+
+char* __fastcall__ strcasestr(const char *str, const char *substr) {
+  size_t len_a = strlen(str);
+  size_t len_b = strlen(substr);
+  const char *end_str;
+
+  if (len_a < len_b)
+    return NULL;
+
+  len_a -= len_b;
+
+  for (end_str = str + len_a + 1; str < end_str; str++) {
+    if (!strncasecmp(str, substr, len_b))
+      return (char *)str;
+  }
+  return NULL;
+}