字符分割

/* Copyright(C) 2012 for free
 * All right reserved
 */
/**
 * File split_string.c
 * Brief  分割字符串
 * Author sense, [e-mail]
 * Date 2012-08-24
 */
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

char *split(char *buf, char seprate, int num)
{
    char *tmp, *info;
    int i = 0,n = 0,len = 0,times = 0;

    tmp = buf;
//    printf("buf :%s\n",buf);

    for (i = 0; *buf != '\0';i++) {
         n++;
        if(*buf == seprate) {
            len = n - 1;
            n = 0;
            if (times == (num -1) && times >= 0) {
                //buf++;
                tmp = buf + 1;
            }
            if (times == num) {
                if (!strncmp(tmp, buf,1)) {
                    return NULL;
                }
                break;
            }
            times++;
        }
        buf++;
    }
    if (*buf == '\0'){ //此时len为上一节的长度
        info = (char *)malloc((buf-tmp) + 1);
        memset(info, 0, ((buf-tmp) + 1));
        strcpy(info,tmp);
    }
    else {
        info = (char *)malloc(len + 1);
        memset(info, 0, (len + 1));
        strncpy(info,tmp,len);
    }
    /*
    info = (char *)malloc(len + 1);
    for (i = 0;i < len;i++) {
        info[i] = tmp[i];
    }
    info[i] = '\0';
    */
//    printf("info: %s\n",info);
    tmp = NULL;

    return info ;
}


int main(int argc, char *argv[])
{
    char *buf = "2012|8|25";
    char *buf1 = "2|||1|22|333|444||||||||2";
    char *data = NULL;
    int i = 0;
#if 1
    for (; i<3; i++)
    {
        data = split(buf, '|', i);
        printf("%s\n",data);
        free(data);
        data = NULL;
    }
#endif
    printf("buf: %s\n",buf1);
    for (i=0; i<15; i++)
    {
        data = split(buf1, '|', i);
        if (data != NULL) {
            printf("i:%d %s\n",i,data);
            free(data);
            data = NULL;
        }
        else {
            printf("i:%d, it's null .\n",i);
        }
    }

    return 0;
}
#endif

测试：
$ gcc split_string.c  -o split
$ ./split
2012
8
25