Added x_strcmp to compare two strings

x_string/src/x_string.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+// return the length of string to the null terminator
 int x_strlen(char* str){
 	char* ptr = str;
 	while(*ptr != '\0'){
@@ -9,6 +10,8 @@ int x_strlen(char* str){
 	return ptr - str;
 }
 
+// copy one string to another destination
+// must include the size of the destination
 void x_strcpy(char* dest, char* src, const int size_dest){
 	char* dest_ptr = dest;
 	char* src_ptr = src;
@@ -26,7 +29,32 @@ void x_strcpy(char* dest, char* src, const int size_dest){
 	}
 
 }
+// compare two strings
+// return 0 if equal to eachother
+// return -1 if not
+int x_strcmp (char* str1, char* str2){
+	char* ptr1 = str1;
+	char* ptr2 = str2;
 
+	while(*ptr1 != '\0' && *ptr2 != '\0'){
+		if(*ptr1 != *ptr2){
+			return -1;
+		}
+
+		ptr1++;
+		ptr2++;
+	}
+
+	// if havent reached the end of one of the strings
+	if (*ptr1 != '\0' || *ptr2 != '\0'){
+		return -1;
+	}
+
+	return 0;
+}
+
+
+// concatinate two strings
 char* x_strconcat(char* str1, char* str2){
 
 	char* new_string;

x_string/src/x_string.h

@@ -3,6 +3,7 @@
 
 int x_strlen(char*);
 void x_strcpy(char*, char*, const int);
+int x_strcmp(char*, char*);
 char* x_strconcat(char*, char*);
 
 #endif