From 0496473cf5adce1afe751f26233c9c6e2d1c4582 Mon Sep 17 00:00:00 2001
From: herbglitch <bighebe@gmail.com>
Date: Thu, 22 Feb 2024 02:50:06 -0700
Subject: [PATCH] added find back cstring to ARC_String

---
 include/arc/std/string.h | 11 +++++++++++
 src/std/string.c         | 21 +++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/include/arc/std/string.h b/include/arc/std/string.h
index bc7b02d..be53e27 100644
--- a/include/arc/std/string.h
+++ b/include/arc/std/string.h
@@ -166,6 +166,17 @@ uint64_t ARC_String_FindCString(ARC_String *string, const char *cstring, uint64_
  */
 uint64_t ARC_String_FindBack(ARC_String *string, ARC_String *substring);
 
+/**
+ * @brief takes a given string, and assigns index and length for position of last matching substring
+ *
+ * @param string the string that will be searched
+ * @param cstring the cstring to find within string
+ * @param length  the length of cstring
+ *
+ * @return ~(uint64_t)0 on error, anything else on success
+ */
+uint64_t ARC_String_FindBackCString(ARC_String *string, const char *cstring, uint64_t length);
+
 /**
  * @brief strips the ends based on a given char
  *
diff --git a/src/std/string.c b/src/std/string.c
index bee9680..9fe85a6 100644
--- a/src/std/string.c
+++ b/src/std/string.c
@@ -204,6 +204,27 @@ uint64_t ARC_String_FindBack(ARC_String *string, ARC_String *substring){
     return ~(uint64_t)0;
 }
 
+uint64_t ARC_String_FindBackCString(ARC_String *string, const char *cstring, uint64_t length){
+    if(!string || !cstring){
+        arc_errno = ARC_ERRNO_NULL;
+        ARC_DEBUG_ERR("ARC_String_FindBack(string, substring), string or substring was null");
+        return ~(uint64_t)0;
+    }
+
+    if(length > string->length){
+        return ~(uint64_t)0;
+    }
+
+    uint64_t max = string->length - (length - 1);
+    for(; max; max--){
+        if(!strncmp(string->data + (max - 1), cstring, length)){
+            return max;
+        }
+    }
+
+    return ~(uint64_t)0;
+}
+
 void ARC_String_StripEnds(ARC_String **stripped, ARC_String *original, char charToStrip){
     if(!original){
         arc_errno = ARC_ERRNO_NULL;