106 lines
1.4 KiB
C
106 lines
1.4 KiB
C
#include "types.h"
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void *
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memset(void *dst, int c, u32 n)
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{
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char *cdst = (char *)dst;
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int i;
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for(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
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memcmp(const void *v1, const void *v2, u32 n)
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{
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const u8 *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, u32 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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while(n-- > 0)
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*d++ = *s++;
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return dst;
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}
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// memcpy exists to placate GCC. Use memmove.
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void *
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memcpy(void *dst, const void *src, u32 n)
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{
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return memmove(dst, src, n);
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}
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int
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strncmp(const char *p, const char *q, u32 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 (u8)*p - (u8)*q;
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}
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char *
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strncpy(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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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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// 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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int
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strlen(const char *s)
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{
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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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}
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