36 lines
875 B
C++
36 lines
875 B
C++
#include <cstring>
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extern "C" void *memset(void *dest, int ch, size_t count) {
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unsigned char c = static_cast<unsigned char>(ch);
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unsigned char *d = (unsigned char *)dest;
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for (size_t i = 0; i < count; ++i)
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d[i] = c;
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return dest;
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}
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extern "C" void *memcpy(void *dest, const void *src, size_t count) {
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unsigned char *d = (unsigned char *)dest;
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const unsigned char *s = (const unsigned char *)src;
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for (size_t i = 0; i < count; ++i)
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d[i] = s[i];
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return dest;
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}
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extern "C" int strcmp(const char *lhs, const char *rhs) {
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const unsigned char *l = (const unsigned char *)lhs;
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const unsigned char *r = (const unsigned char *)rhs;
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while (*l == *r) {
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if (*l == 0)
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return 0;
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++l;
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++r;
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}
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return *l < *r ? -1 : 1;
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}
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extern "C" size_t strlen(const char *str) {
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size_t len = 0;
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while (str[len] != '\0')
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++len;
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return len;
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}
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