1 files changed, 63 insertions, 3 deletions

diff --git a/dev/boot/src/BootSupport.cc b/dev/boot/src/BootSupport.cc
index ce824e0f..4bf3e68a 100644
--- a/dev/boot/src/BootSupport.cc
+++ b/dev/boot/src/BootSupport.cc
@@ -18,6 +18,69 @@
 /// @param dst destination pointer.
 /// @param byte value to fill in.
 /// @param len length of of src.
+EXTERN_C VoidPtr memnset(void* dst, int byte, long long unsigned int len,
+                         long long unsigned int dst_size) {
+  if (!dst || len > dst_size) {
+    // For now, we return nullptr or an error status.
+    return nullptr;
+  }
+  unsigned char* p   = (unsigned char*) dst;
+  unsigned char  val = (unsigned char) byte;
+  for (size_t i = 0UL; i < len; ++i) {
+    p[i] = val;
+  }
+  return dst;
+}
+
+/// @brief memcpy definition in C++.
+/// @param dst destination pointer.
+/// @param  src source pointer.
+/// @param len length of of src.
+EXTERN_C VoidPtr memncpy(void* dst, const void* src, long long unsigned int len,
+                         long long unsigned int dst_size) {
+  if (!dst || !src || len > dst_size) {
+    // Similar to memset, this is a critical failure.
+    return nullptr;
+  }
+  unsigned char*       d = (unsigned char*) dst;
+  const unsigned char* s = (const unsigned char*) src;
+  for (size_t i = 0UL; i < len; ++i) {
+    d[i] = s[i];
+  }
+  return dst;
+}
+
+/// @brief strlen definition in C++.
+EXTERN_C size_t strnlen(const char* whatToCheck, size_t max_len) {
+  size_t len = 0;
+  while (len < max_len && whatToCheck[len] != '\0') {
+    ++len;
+  }
+  return len;
+}
+
+/// @brief strcmp definition in C++.
+EXTERN_C int strncmp(const char* whatToCheck, const char* whatToCheckRight, size_t max_len) {
+  size_t i = 0;
+  while (i < max_len && whatToCheck[i] == whatToCheckRight[i]) {
+    if (whatToCheck[i] == '\0') return 0;
+    ++i;
+  }
+  if (i == max_len) {
+    return 0;
+  }
+  return (unsigned char) whatToCheck[i] - (unsigned char) whatToCheckRight[i];
+}
+
+/// @brief something specific to the Microsoft's ABI, When the stack grows too big.
+EXTERN_C void ___chkstk_ms(void) {}
+
+/// @note GCC expects them to be here.
+
+/// @brief memset definition in C++.
+/// @param dst destination pointer.
+/// @param byte value to fill in.
+/// @param len length of of src.
 EXTERN_C VoidPtr memset(void* dst, int byte, long long unsigned int len) {
   for (size_t i = 0UL; i < len; ++i) {
     ((int*) dst)[i] = byte;
@@ -62,7 +125,4 @@ EXTERN_C int strcmp(const char* whatToCheck, const char* whatToCheckRight) {
   return len;
 }
 
-/// @brief something specific to the Microsoft's ABI, When the stack grows too big.
-EXTERN_C void ___chkstk_ms(void) {}
-
 #endif