可变参数函数

最新推荐文章于 2023-09-03 11:16:21 发布

myerel

最新推荐文章于 2023-09-03 11:16:21 发布

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分类专栏： C 文章标签： c C 可变参数函数

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#include <stdarg.h>

int iVar = 0;
char cVar = '';

/* Call MyPrintf */
MyPrintf("Myprintf test %d, %c", iVar, cVar);

unsigned int MyPrintf(char *pchFormat, ... )
{
    /* Get Argument Number */
    unsigned int uiArgNum = 0;
    uiArgNum = CountArgNum(pchFormat);

    if(NULL == pchFormat)
    {
        return ERROR;
    }
    
    /* Get Argument Into Array */
    int iArrArg[10];
    va_list vaArgList;                                         /* declare argument list: vaArgList */
    va_start(vaArgList, pchFormat);                    /* point vaArgList to the  first argument */
    unsigned int i = 0;
    while(i < uiArgNum)
    {
        iArrArg[i] = va_arg(vaArgList, int);           /* get one argument from vaArgList into iArrArg */
        i++;
    }
    va_end(vaArgList);                                     /* set vaArgList to NULL  */

    /* Printf Case Argument Number */
    switch(uiArgNum)
    {
    case 0:
            printf(pchFormat);
            fprintf(pfLog, pchFormat);
            break;
    case 1:
            printf(pchFormat, iArrArg[0]);
            fprintf(pfLog, pchFormat, iArrArg[0]);
            break;
    case 2:
            printf(pchFormat, iArrArg[0], iArrArg[1]);
            fprintf(pfLog, pchFormat, iArrArg[0], iArrArg[1]);
            break;
    case 3:
            printf(pchFormat, iArrArg[0], iArrArg[1], iArrArg[2]);
            fprintf(pfLog, pchFormat, iArrArg[0], iArrArg[1], iArrArg[2]);
            break;
    default:
            break;
    }

    return OK;
}

unsigned int CountArgNum(char *pchFormat)
{
    /* parse string */
    return uiArgNum;
}