screenshot util

src/kernel/userland/libc/stdlib.c

@@ -148,6 +148,30 @@ void *memcpy(void *dest, const void *src, size_t n) {
     return dest;
 }
 
+void *memmove(void *dest, const void *src, size_t n) {
+    unsigned char *d = (unsigned char *)dest;
+    const unsigned char *s = (const unsigned char *)src;
+    if (d < s) {
+        while (n--) *d++ = *s++;
+    } else {
+        d += n;
+        s += n;
+        while (n--) *--d = *--s;
+    }
+    return dest;
+}
+
+int memcmp(const void *s1, const void *s2, size_t n) {
+    const unsigned char *p1 = (const unsigned char *)s1;
+    const unsigned char *p2 = (const unsigned char *)s2;
+    while (n--) {
+        if (*p1 != *p2) return *p1 - *p2;
+        p1++;
+        p2++;
+    }
+    return 0;
+}
+
 // String functions
 size_t strlen(const char *s) {
     size_t len = 0;

src/kernel/userland/libc/string.h

@@ -1,6 +1,11 @@
 #ifndef BOREDOS_LIBC_STRING_H
 #define BOREDOS_LIBC_STRING_H
 
-#include <stdlib.h>
+#include <stddef.h>
+
+void *memmove(void *dest, const void *src, size_t n);
+int memcmp(const void *s1, const void *s2, size_t n);
+void *memcpy(void *dest, const void *src, size_t n);
+void *memset(void *s, int c, size_t n);
 
 #endif