93 lines
1.5 KiB
C
93 lines
1.5 KiB
C
#include "string.h"
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#include "latype.h"
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// mem ops could be more better
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// use loop unrolling
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void *memset(void *dst, int c, uint n) {
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char *cdst = (char *) dst;
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for (uint i = 0; i < n; ++i) {
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cdst[i] = c;
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}
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return dst;
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}
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int memcmp(const void *m1, const void *m2, uint n) {
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const uchar *s1, *s2;
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s1 = m1;
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s2 = m2;
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while (n --> 0) {
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if(*s1 != *s2)
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return *s1 - *s2;
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s1++;
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s2++;
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}
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return 0;
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}
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void *memmove(void *dst, const void *src, uint n) {
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const char *s;
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char *d;
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if(n == 0)
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return dst;
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s = src;
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d = dst;
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if(s < d && s + n > d){
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s += n;
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d += n;
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while(n-- > 0)
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*--d = *--s;
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} else
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while(n-- > 0)
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*d++ = *s++;
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return dst;
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}
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void *memcpy(void *dst, const void *src, uint n) {
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return memmove(dst, src, n);
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}
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int strncmp(const char *p, const char *q, uint n) {
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while(n > 0 && *p && *p == *q)
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n--, p++, q++;
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if(n == 0)
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return 0;
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return (uchar)*p - (uchar)*q;
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}
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char *strncpy(char *s, const char *t, int n) {
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char *os;
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os = s;
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while(n-- > 0 && (*s++ = *t++) != 0)
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;
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while(n-- > 0)
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*s++ = 0;
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return os;
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}
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char *strcpy_s(char *s, const char *t, int n) {
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char *os;
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os = s;
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if(n <= 0)
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return os;
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while(--n > 0 && (*s++ = *t++) != 0)
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;
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*s = 0;
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return os;
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}
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int strlen(const char *s) {
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int n;
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for(n = 0; s[n]; n++)
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;
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return n;
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} |