Daniel Hammer
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
// GCC and Clang reserve the right to generate calls to the following
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// 4 functions even if they are not directly called.
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// Implement them as the C specification mandates.
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// DO NOT remove or rename these functions, or stuff will eventually break!
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// They CAN be moved to a different .cpp file.
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#include <cstdint>
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extern "C" {
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void *memcpy(void *dest, const void *src, std::size_t n) {
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std::uint8_t *pdest = static_cast<std::uint8_t *>(dest);
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const std::uint8_t *psrc = static_cast<const std::uint8_t *>(src);
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for (std::size_t i = 0; i < n; i++) {
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pdest[i] = psrc[i];
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}
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return dest;
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}
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void *memset(void *s, int c, std::size_t n) {
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std::uint8_t *p = static_cast<std::uint8_t *>(s);
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for (std::size_t i = 0; i < n; i++) {
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p[i] = static_cast<uint8_t>(c);
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}
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return s;
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}
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void *memmove(void *dest, const void *src, std::size_t n) {
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std::uint8_t *pdest = static_cast<std::uint8_t *>(dest);
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const std::uint8_t *psrc = static_cast<const std::uint8_t *>(src);
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if (src > dest) {
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for (std::size_t i = 0; i < n; i++) {
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pdest[i] = psrc[i];
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}
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} else if (src < dest) {
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for (std::size_t i = n; i > 0; i--) {
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pdest[i-1] = psrc[i-1];
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}
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}
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return dest;
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}
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int memcmp(const void *s1, const void *s2, std::size_t n) {
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const std::uint8_t *p1 = static_cast<const std::uint8_t *>(s1);
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const std::uint8_t *p2 = static_cast<const std::uint8_t *>(s2);
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for (std::size_t i = 0; i < n; i++) {
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if (p1[i] != p2[i]) {
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return p1[i] < p2[i] ? -1 : 1;
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}
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}
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return 0;
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}
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} |