110 lines
2.0 KiB
C
110 lines
2.0 KiB
C
// See LICENSE for license details.
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#include <stdint.h>
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#include <ctype.h>
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#include "string.h"
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void* memcpy(void* dest, const void* src, size_t len) {
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const char* s = src;
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char* d = dest;
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if ((((uintptr_t)dest | (uintptr_t)src) & (sizeof(uintptr_t) - 1)) == 0) {
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while ((void*)d < (dest + len - (sizeof(uintptr_t) - 1))) {
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*(uintptr_t*)d = *(const uintptr_t*)s;
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d += sizeof(uintptr_t);
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s += sizeof(uintptr_t);
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}
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}
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while (d < (char*)(dest + len)) *d++ = *s++;
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return dest;
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}
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void* memset(void* dest, int byte, size_t len) {
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if ((((uintptr_t)dest | len) & (sizeof(uintptr_t) - 1)) == 0) {
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uintptr_t word = byte & 0xFF;
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word |= word << 8;
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word |= word << 16;
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word |= word << 16 << 16;
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uintptr_t* d = dest;
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while (d < (uintptr_t*)(dest + len)) *d++ = word;
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} else {
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char* d = dest;
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while (d < (char*)(dest + len)) *d++ = byte;
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}
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return dest;
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}
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size_t strlen(const char* s) {
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const char* p = s;
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while (*p) p++;
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return p - s;
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}
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int strcmp(const char* s1, const char* s2) {
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unsigned char c1, c2;
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do {
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c1 = *s1++;
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c2 = *s2++;
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} while (c1 != 0 && c1 == c2);
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return c1 - c2;
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}
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char* strcpy(char* dest, const char* src) {
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char* d = dest;
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while ((*d++ = *src++))
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;
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return dest;
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}
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long atol(const char* str) {
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long res = 0;
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int sign = 0;
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while (*str == ' ') str++;
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if (*str == '-' || *str == '+') {
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sign = *str == '-';
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str++;
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}
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while (*str) {
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res *= 10;
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res += *str++ - '0';
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}
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return sign ? -res : res;
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}
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void* memmove(void* dst, const void* src, size_t 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) *--d = *--s;
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} else
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while (n-- > 0) *d++ = *s++;
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return dst;
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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) 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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} |