104 lines
1.7 KiB
C
104 lines
1.7 KiB
C
#include "types.h"
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#include "x86.h"
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void* memset(void *dst, int c, uint n) {
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if ((int)dst % 4 == 0 && n % 4 == 0) {
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c &= 0xFF;
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stosl(dst, (c << 24) | (c << 16) | (c << 8) | c, n / 4);
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}
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else {
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stosb(dst, c, n);
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}
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return dst;
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}
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int memcmp(const void *v1, const void *v2, uint n) {
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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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}
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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* 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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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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}
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}
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else {
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while (n-- > 0) {
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*d++ = *s++;
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}
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}
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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* 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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}
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if (n == 0) {
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return 0;
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}
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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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}
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while (n-- > 0) {
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*s++ = 0;
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}
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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* safestrcpy(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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}
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while (--n > 0 && (*s++ = *t++) != 0) {
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;
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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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}
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return n;
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}
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