lots and lots of userspace stuff

1 files changed, 36 insertions, 0 deletions

diff --git a/euler/source/std/cstring.cpp b/euler/source/std/cstring.cpp
new file mode 100644
index 0000000..3e5a56c
--- /dev/null
+++ b/euler/source/std/cstring.cpp
@@ -0,0 +1,36 @@
+#include <cstring>
+
+extern "C" void *memset(void *dest, int ch, size_t count) {
+  unsigned char c = static_cast<unsigned char>(ch);
+  unsigned char *d = (unsigned char *)dest;
+  for (size_t i = 0; i < count; ++i)
+    d[i] = c;
+  return dest;
+}
+
+extern "C" void *memcpy(void *dest, const void *src, size_t count) {
+  unsigned char *d = (unsigned char *)dest;
+  const unsigned char *s = (const unsigned char *)src;
+  for (size_t i = 0; i < count; ++i)
+    d[i] = s[i];
+  return dest;
+}
+
+extern "C" int strcmp(const char *lhs, const char *rhs) {
+  const unsigned char *l = (const unsigned char *)lhs;
+  const unsigned char *r = (const unsigned char *)rhs;
+  while (*l == *r) {
+    if (*l == 0)
+      return 0;
+    ++l;
+    ++r;
+  }
+  return *l < *r ? -1 : 1;
+}
+
+extern "C" size_t strlen(const char *str) {
+  size_t len = 0;
+  while (str[len] != '\0')
+    ++len;
+  return len;
+}