libluna+libc: Add strpbrk()

libc/include/string.h

@@ -65,6 +65,9 @@ extern "C"
     /* Return the length of the initial segment of str which consists only of bytes not in reject. */
     size_t strcspn(const char* str, const char* reject);
 
+    /* Return a pointer to the first occurrence of any of the characters in accept in s. */
+    char* strpbrk(const char* s, const char* delim);
+
     /* Separate a string into several tokens. */
     char* strtok(char* str, const char* delim);
 

libluna/include/luna/CString.h

@@ -34,4 +34,6 @@ extern "C"
 
     char* strchr(const char* str, int c);
     char* strrchr(const char* str, int c);
+
+    char* strpbrk(const char* s, const char* accept);
 }

libluna/src/CString.cpp

@@ -237,4 +237,15 @@ extern "C"
 
         return nullptr;
     }
+
+    char* strpbrk(const char* s, const char* accept)
+    {
+        usize index = strcspn(s, accept);
+
+        const char* ptr = s + index;
+
+        if (*ptr) return const_cast<char*>(ptr);
+
+        return nullptr;
+    }
 }