string.c

/* OneOS-ARM String Utilities Implementation */

#include "string.h"

int strcmp(const char *s1, const char *s2)
{
    while (*s1 && *s2) {
        if (*s1 != *s2) {
            return *s1 - *s2;
        }
        s1++;
        s2++;
    }
    return *s1 - *s2;
}

size_t strlen(const char *s)
{
    size_t len = 0;
    while (*s++) len++;
    return len;
}

void *memcpy(void *dest, const void *src, size_t n)
{
    unsigned char *d = (unsigned char *)dest;
    const unsigned char *s = (const unsigned char *)src;
    
    for (size_t i = 0; i < n; i++) {
        d[i] = s[i];
    }
    
    return dest;
}

void *memset(void *s, int c, size_t n)
{
    unsigned char *p = (unsigned char *)s;
    
    for (size_t i = 0; i < n; i++) {
        p[i] = (unsigned char)c;
    }
    
    return s;
}