Implement proc_map () and proc_unmap () syscalls

libmsl/string/string.c

@@ -0,0 +1,47 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <string/string.h>
+
+size_t memset (void* dst, uint8_t b, size_t n) {
+  uint8_t* dst1 = dst;
+  size_t i;
+  for (i = 0; i < n; i++)
+    dst1[i] = b;
+  return i;
+}
+
+size_t memcpy (void* dst, const void* src, size_t n) {
+  uint8_t* dst1 = dst;
+  const uint8_t* src1 = src;
+  size_t i;
+  for (i = 0; i < n; i++)
+    dst1[i] = src1[i];
+  return i;
+}
+
+// SOURCE: https://stackoverflow.com/a/48967408
+void strncpy (char* dst, const char* src, size_t n) {
+  size_t i = 0;
+  while (i++ != n && (*dst++ = *src++))
+    ;
+}
+
+size_t strlen (const char* str) {
+  const char* s;
+  for (s = str; *s; ++s)
+    ;
+  return (s - str);
+}
+
+int memcmp (const void* s1, const void* s2, size_t n) {
+  unsigned char* p = (unsigned char*)s1;
+  unsigned char* q = (unsigned char*)s2;
+
+  while (n--) {
+    if (*p != *q) {
+      return (int)*p - (int)*q;
+    }
+    p++, q++;
+  }
+  return 0;
+}