50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
#include "rt_string.h"
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int rt_memcmp(const void* s1, const void* s2, rt_size_t n) {
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const unsigned char *p1 = s1, *p2 = s2;
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for (rt_size_t i = 0; i < n; ++i) {
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if (p1[i] != p2[i])
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return p1[i] - p2[i];
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}
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return 0;
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}
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int rt_strcmp(const char* s1, const char* s2) {
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while (*s1 && *s2 && (*s1 == *s2)) {
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s1++;
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s2++;
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}
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return *(const unsigned char*)s1 - *(const unsigned char*)s2;
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}
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void* rt_memcpy(void* restrict dest, const void* restrict src, rt_size_t n) {
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u8_t* d = dest;
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const u8_t* s = src;
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for (rt_size_t i = 0; i < n; ++i)
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d[i] = s[i];
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return dest;
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}
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void* rt_memset(void* dest, int val, rt_size_t n) {
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u8_t* p = dest;
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for (rt_size_t i = 0; i < n; ++i)
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p[i] = (u8_t)val;
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return dest;
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}
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rt_size_t rt_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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/* strhash - 字符串哈希（用于符号表） */
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u32_t rt_strhash(const char* s) {
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u32_t hash = 2166136261u; // FNV-1a偏移基础值
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while (*s) {
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hash ^= *s++;
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hash *= 16777619u;
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}
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return hash;
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}
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