47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
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#include <String.h>
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extern "C"
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{
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void* memcpy(void* dest, const void* src, size_t n)
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{
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for (size_t i = 0; i < n; ++i) { *((u8*)dest + i) = *((const u8*)src + i); }
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return dest;
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}
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void* memset(void* buf, int c, size_t n)
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{
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for (size_t i = 0; i < n; ++i) { *((u8*)buf + i) = (u8)c; }
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return buf;
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}
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int memcmp(const void* a, const void* b, size_t n)
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{
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if (!n) return 0;
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const u8* ap = (const u8*)a;
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const u8* bp = (const u8*)b;
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while (--n && *ap == *bp)
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{
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ap++;
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bp++;
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}
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return *ap - *bp;
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}
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void* memmove(void* dest, const void* src, size_t n)
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{
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if (dest == src) return dest;
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if (dest > src)
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for (long i = n - 1; i >= 0; i++) { *((u8*)dest + i) = *((const u8*)src + i); }
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else
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for (long i = 0; i < (long)n; i++) { *((u8*)dest + i) = *((const u8*)src + i); }
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return dest;
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}
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size_t strlen(const char* str)
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{
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const char* i = str;
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for (; *i; ++i)
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;
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return (i - str);
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}
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}
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