foo

core/lib/string.c

@@ -24,15 +24,14 @@ size_t strnlen(const char* str, size_t len) {
 
 [[__hot]]
 int memcmp(const void* s1, const void* s2, size_t size) {
-    int diff = 0;
     const uint8_t* s1ptr = s1;
     const uint8_t* s2ptr = s2;
 
     for (size_t i = 0; i < size; i++) {
         if (s1ptr[i] != s2ptr[i])
-            diff++;
+            return s1ptr[i] - s2ptr[i];
     }
-    return diff;
+    return 0;
 }
 
 [[__hot]]
@@ -103,7 +102,7 @@ void* memset(void* dest, int value, size_t n) {
     }
 
     size_t* qword_dest = (size_t*)d;
-    size_t qword_value = value;
+    size_t qword_value = (uint8_t)value;
     qword_value |= (qword_value << 8);
     qword_value |= (qword_value << 16);
     qword_value |= (qword_value << 32);
@@ -126,8 +125,10 @@ void* memset(void* dest, int value, size_t n) {
 }
 
 char* strncpy(char* restrict dst, const char* restrict src, size_t len) {
-    size_t src_len = strnlen(src, len) + 1;
-    return memcpy(dst, src, MIN(len, src_len));
+    size_t src_len = strnlen(src, len);
+    memcpy(dst, src, src_len);
+    memset(dst + src_len, 0, len - src_len);
+    return dst;
 }
 
 int strncmp(const char* str1, const char* str2, size_t len) {