string.c

Bycore是一个嵌入式操作系统内核。Bycore包括内存管理、任务管理、中断管理、任务互斥、同步与通信管理等功能。Bycore全部由C语言完成

/**
 *  string.c - sting library that likes C standard library.
 *
 *  Copyright (C) 2008  ZhangHu
 *  All rights reserved.
 *  E-MAIL: [e-mail]
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "common/string.h"
#include "include/types.h"


/**
 * lib_strcpy - Copy source string to destination string.
 * @Dest: Pointer to destination string.
 * @Src: Pointer to source string.
 * @return: Destination string.
 *
 * @notes:
 */
char_t *lib_strcpy(char_t *Dest, const char_t *Src) {
    char_t *str = Dest;
    if((Dest == NULL) || (Src == NULL)) {
        return NULL;
    }
    do {
        *str++ = *Src;
    } while(*Src++ != '\0');
    return Dest;
}

/**
 * lib_strcmp - Compare two strings.
 * @Dest: Pointer to one string.
 * @Src: Pointer to another string.
 * @return: 0 if equality.
 *
 * @notes:
 */
int lib_strcmp(const char *str1, const char_t *str2) {
    char_t ch1, ch2;
    const uchar_t *s1;
    const uchar_t *s2;

    s1 = (const uchar_t*)str1;
    s2 = (const uchar_t*)str2;
    do {
        ch1 = (uchar_t)*s1++;
        ch2 = (uchar_t)*s2++;
        if(ch1 == '\0') {
            return ch1 - ch2;
        }
    } while(ch1 == ch2);
    return ch1 - ch2;
}