common.c

v//==============================================================================
//  Copyright (c) 2020, undbsd
//  All rights reserved.
//
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are met:
//
//  1. Redistributions of source code must retain the above copyright notice, this
//     list of conditions and the following disclaimer.
//
//  2. Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
//  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
//  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
//  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
//  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
//  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
//  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
//  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//==============================================================================

#include <libcommon/common.h>

void C_memset(void *dst, int dsize, int fill, int count)
{
    register char *s = dst;
    count = (count > dsize) ? dsize : count;    //Max
    while(count--) {
        *s++ = (char)fill;
    }
}

void C_memcpy(void *dst, int dsize, void *src, int ssize)
{
    register char *dp = dst;
    register char *sp = src;
    int i = (dsize > ssize) ? ssize : dsize;    //Min
    while(i--) {
        *dp++ = *sp++;
    }
}

int C_memcmp(void *a, int asize, void *b, int bsize)
{
    register char *ca = a;
    register char *cb = b;
    while(asize-- && bsize--) {
        if(*ca != *cb) {
            return (*ca - *cb);
        }

        ca++;
        cb++;
    }

    return 0;
}

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

void C_strcpy(char *dst, int dsize, const char *src)
{
    while(*src && dsize--) {
        *dst++ = *src++;
    }

    if(dsize) {
        //The null-terminator
        *dst++ = '\0';
    }
}

int C_strcmp(const char *a, const char *b)
{
    while(*a && (*a == *b)) {
        a++;
        b++;
    }

    return (*a - *b);
}

char * C_strchr(const char *s, char c)
{
    while(*s) {
        if(*s == c) {
            return (char *)s;
        }

        s++;
    }

    return null;
}

bool C_isdigit(char c)
{
    return (c >= '0' && c <= '9');
}

bool C_ishex(char c)
{
    return ((c >= '0' && c <= '9')  ||  // 0..9
            (c >= 'a' && c <= 'f')  ||  // a..f
            (c >= 'A' && c <= 'F'));    // A..F
}