62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
#include "../include/memory.h"
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void memclean(char *s, int len) {
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// 清理某个内存区域（全部置0）
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int i;
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for (i = 0; i != len; i++) {
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s[i] = 0;
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}
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return;
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}
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void *memcpy(void *dst_, const void *src_, uint32_t size) {
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uint8_t *dst = dst_;
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const uint8_t *src = src_;
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while (size-- > 0) *dst++ = *src++;
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return (void *) src_;
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}
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int memcmp(const void *a_, const void *b_, uint32_t size) {
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const char *a = a_;
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const char *b = b_;
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while (size-- > 0) {
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if (*a != *b) return *a > *b ? 1 : -1;
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a++, b++;
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}
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return 0;
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}
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void *memset(void *s, int c, size_t n) {
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unsigned char *p = s;
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while (n-- > 0)
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*p++ = c;
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return s;
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}
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void *memmove(void *dest, const void *src, size_t num) {
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void *ret = dest;
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if (dest < src) {
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while (num--)//前->后
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{
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*(char *) dest = *(char *) src;
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dest = (char *) dest + 1;
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src = (char *) src + 1;
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}
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} else {
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while (num--)//后->前
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{
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*((char *) dest + num) = *((char *) src + num);
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}
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}
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return ret;
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}
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void *realloc(void *ptr, uint32_t size) {
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void *new = kmalloc(size);
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if (ptr) {
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memcpy(new, ptr, *(int *)((int)ptr - 4));
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kfree(ptr);
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}
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return new;
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} |