initial commit

lib/string.c

@@ -0,0 +1,35 @@
+#include <stddef.h>
+#include <string.h>
+
+int strcmp(const char *a, const char *b)
+{
+  while (*a != '\0' && *b != '\0') {
+    if (*a != *b)
+      return (*a > *b) - (*a < *b);
+    a++, b++;
+  }
+  if (*a == '\0' && *b == '\0')
+    return 0;
+
+  if (*a == '\0')
+    return -1;
+  return 1;
+}
+
+void *memcpy(void *dest, const void *src, size_t count)
+{
+  void *ret = dest;
+  for (const byte_t *p = src; count > 0; --count, ++p, ++dest)
+    *(byte_t *)dest = *p;
+
+  return ret;
+}
+
+void *memzero(void *start, void *end)
+{
+  void *ret = start;
+  for (byte_t *p = start; p < (byte_t *)end; ++p)
+    *p = 0;
+  
+  return ret;
+}