83 lines
1.2 KiB
C
83 lines
1.2 KiB
C
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// TODO: CHECK/REPLACE/UPDATE OLD CODE (this file is based on xv6)
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#include "types.h"
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#define KERNEL_MODE
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#include <libc/string.c>
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int
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memcmp(const void *v1, const void *v2, uint n)
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{
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const uchar *s1, *s2;
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s1 = v1;
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s2 = v2;
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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++, s2++;
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}
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return 0;
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}
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void*
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memmove(void *dst, const void *src, uint n)
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{
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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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#ifdef _ZCC
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//if (n >= 8 && (d + n < s || s + n < d)) {
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// return memcpy_opt(dst, src, n);
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/*uint smalln = n %8;
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uint bign = n - smalln;
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memcpy_quick64(dst, src, bign);
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d += bign;
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s += bign;
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n = smalln;*/
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//}
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#endif
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while(n-- > 0)
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*d++ = *s++;
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}
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return dst;
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}
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int
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strncmp(const char *p, const char *q, uint n)
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{
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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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// Like strncpy but guaranteed to NUL-terminate.
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char*
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safestrcpy(char *s, const char *t, int n)
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{
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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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