common.cc

//=======================================================================
//  This Source Code Form is subject to the terms of the Mozilla Public
//  License, v2.0. If a copy of the MPL was not distributed with this
//  file, You can obtain one at http://mozilla.org/MPL/2.0/.
//=======================================================================

#include <libcommon/common.h>

int C_strlen(const char *s)
{
    int i = 0;
    while(*(++i + s));
    return i;
}

char * C_strcpy(char *dst, int dst_size, const char *src)
{
    const int src_size = C_strlen(src);
    for(int i = 0; (i < src_size) && (i < dst_size); i++) {
        *(dst + i) = *(src + i);
    }
    return dst;
}

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

void * C_memset(void *dst, int fill, int count)
{
    for(int i = 0; i < count; i++) {
        *((unsigned char *)dst + i) = (unsigned char)fill;
    }

    return dst;
}

void * C_memcpy(void *dst, int dst_size, void *src, int src_size)
{
    unsigned char *dst_ch = (unsigned char *)dst;
    unsigned char *src_ch = (unsigned char *)src;

    for(int i = 0; (i < dst_size) && (i < src_size); i++) {
        *(dst_ch + i) = *(src_ch + i);
    }

    return dst;
}

int C_memcmp(void *p1, int p1_size, void *p2, int p2_size)
{
    unsigned char *p1_ch = (unsigned char *)p1;
    unsigned char *p2_ch = (unsigned char *)p2;

    for(int i = 0; (i < p1_size) && (i < p2_size); i++) {
        if(*(p1_ch + i) != *(p2_ch + i)) {
            return (*(p1_ch + i) - *(p2_ch + i));
        }
    }

    return 0;
}