79 lines
1.4 KiB
C
79 lines
1.4 KiB
C
#include <memory.h>
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#include <stdint.h>
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#include <stddef.h>
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// NOTE: Functions in this file have different names during testing, since they
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// are otherwise overridden by standard library functions
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#ifdef TTEST
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void *my_memcpy(void *dst, const void *src, size_t n)
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#else
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void *memcpy(void *dst, const void *src, size_t n)
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#endif
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{
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char *dp = dst;
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const char *sp = src;
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while(n--) *dp++ = *sp++;
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return dst;
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}
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#ifdef TTEST
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void *my_memset(void *s, int c, size_t n)
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#else
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void *memset(void *s, int c, size_t n)
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#endif
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{
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unsigned char *p = s;
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while(n--) *p++ = (unsigned char)c;
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return s;
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}
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#ifdef TTEST
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void *my_memmove(void *dst, const void *src, size_t n)
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#else
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void *memmove(void *dst, const void *src, size_t n)
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#endif
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{
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if(src == dst)
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return dst;
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const void *src_end = (const void *)((uintptr_t)src + n);
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if(src < dst && dst < src_end)
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{
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char *dp = dst;
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const char *sp = src;
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while(n--)
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dp[n] = sp[n];
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return dst;
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}
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memcpy(dst, src, n);
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return dst;
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}
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#ifdef TTEST
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int my_memcmp(const void *s1, const void *s2, size_t n)
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#else
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int memcmp(const void *s1, const void *s2, size_t n)
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#endif
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{
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const unsigned char *p1 = s1, *p2 = s2;
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for(; n--; p1++, p2++)
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{
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if(*p1 != *p2)
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return *p1 - *p2;
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}
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return 0;
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}
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#ifdef TTEST
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size_t my_strlen(const char *s)
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#else
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size_t strlen(const char *s)
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#endif
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{
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size_t len = 0;
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while(*s++) len++;
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return len;
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}
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