LibC: Implement strsep

userspace/libraries/LibC/include/string.h

@@ -42,6 +42,7 @@ char*	strndup(const char* s, size_t n);
 size_t	strnlen(const char* s, size_t maxlen);
 char*	strpbrk(const char* s1, const char* s2);
 char*	strrchr(const char* s, int c);
+char*	strsep(char** __restrict stringp, const char* __restrict delim);
 char*	strsignal(int signum);
 size_t	strspn(const char* s1, const char* s2);
 char*	strstr(const char* s1, const char* s2);

userspace/libraries/LibC/string.cpp

@@ -274,6 +274,25 @@ char* strrchr(const char* str, int c)
 	return (*str == c) ? (char*)str : nullptr;
 }
 
+char* strsep(char** __restrict stringp, const char* __restrict delim)
+{
+	if (*stringp == nullptr)
+		return nullptr;
+
+	char* original = *stringp;
+
+	char* match = strpbrk(*stringp, delim);
+	if (match == nullptr)
+		*stringp = nullptr;
+	else
+	{
+		*stringp = match + 1;
+		*match = '\0';
+	}
+
+	return original;
+}
+
 char* strstr(const char* haystack, const char* needle)
 {
 	const size_t needle_len = strlen(needle);