strtok_r 字符分割

char * strtok_r(char *ptr, const char *sep, char **end)
{
    if(!ptr)
        /* we got NULL input so then we get our last position instead */
        ptr = *end;

    /* pass all letters that are including in the separator string */
    while(*ptr && strchr(sep, *ptr))
        ++ptr;

    if(*ptr)
    {
        /* so this is where the next piece of string starts */
        char *start = ptr;

        /* set the end pointer to the first byte after the start */
        *end = start + 1;

        /* scan through the string to find where it ends, it ends on a
           null byte or a character that exists in the separator string */
        while(**end && !strchr(sep, **end))
            ++*end;

        if(**end)
        {
            /* the end is not a null byte */
            **end = '\0';  /* zero terminate it! */
            ++*end;        /* advance the last pointer to beyond the null byte */
        }

        return start; /* return the position where the string starts */
    }

    /* we ended up on a null byte, there are no more strings to find! */
    return NULL;
}



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使用方法

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int main(int argv,char** argc)
{
    char * str;
    str = (char *)malloc(20);
    memset(str,20,0);
    sprintf( str, "123%s456%s789%s","oo","oo","oo");

    int length = strlen(str);
    char * tok=NULL;
    char *myStrBuf=NULL;
    int idx = 0;

    while (1)
    {

        if (!idx)
            tok = strtok_r(str,"oo",&myStrBuf);
        else
            tok = strtok_r(NULL,"oo",&myStrBuf);

        if (tok)
        {
            printf("%s \n ",tok );
            idx++;
        }
        else
        {
            printf("NULL\n\n");
            break;
        }
    }

    if (myStrBuf)
    {
        //printf("%d\n",(int)(myStrBuf));

        free(str);
    }
	system("pause");

}