main.c: remake cli tool, helper.c: add strcmp, use builtins in some paths

Co-authored-by: tema5002 <tema5002@tuta.io>
Reviewed-on: #4
Co-committed-by: tema5002 <tema5002@tuta.io>

src/helper.c

@@ -2,6 +2,11 @@
 #include "types.h"
 
 int noom_startswith(const char* str, const char* compare) {
+#ifdef __has_builtin
+#if __has_builtin(__builtin_strncmp)
+	return __builtin_strncmp(compare, str, noom_strlen(compare)) == 0;
+#endif
+#endif
 	noom_uint_t i = 0;
 	while (1) {
 		if (compare[i] == '\0') return 1; // we did it
@@ -21,13 +26,27 @@ int noom_streql(const char* stra, noom_uint_t lena, const char* strb, noom_uint_
 	return 1;
 }
 
-noom_uint_t noom_strlen(const char *s)
-{
+noom_uint_t noom_strlen(const char *s) {
+#ifdef __has_builtin
+#if __has_builtin(__builtin_strlen)
+	return __builtin_strlen(s);
+#endif
+#endif
 	const char *a = s;
 	while (*s) s++;
 	return s - a;
 }
 
+int noom_strcmp(const char *a, const char *b) {
+#ifdef __has_builtin
+#if __has_builtin(__builtin_strcmp)
+	return __builtin_strcmp(a, b);
+#endif
+#endif
+	for (; *a && *a == *b; a++, b++);
+	return *(const unsigned char*)a - *(const unsigned char*)b;
+}
+
 void noom_safe_strcpy(char* buffer, noom_uint_t* pos, noom_uint_t buffer_size, const char* src) {
 	while (*src && *pos < buffer_size - 1) {
 		buffer[(*pos)++] = *src++;