Working i386 paging and liballoc

kernel/libk/string.c

@@ -0,0 +1,62 @@
+/*
+Copyright 2025 Kamil Kowalczyk
+
+Redistribution and use in source and binary forms, with or
+without modification, are permitted provided that the following
+conditions are met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <libk/types.h>
+#include <libk/string.h>
+
+usize_t memset(void *dst, byte_t b, usize_t n) {
+  byte_t *dst1 = dst;
+  usize_t i;
+  for (i = 0; i < n; i++)
+    dst1[i] = b;
+  return i;
+}
+
+usize_t memcpy(void *dst, const void *src, usize_t n) {
+  byte_t *dst1 = dst;
+  const byte_t *src1 = src;
+  usize_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, usize_t n) {
+   usize_t i = 0;
+   while(i++ != n && (*dst++ = *src++));
+}
+
+usize_t strlen(const char *str) {
+  const char *s;
+  for (s = str; *s; ++s);
+  return (s - str);
+}