我们实现一个简单的printf函数(可变参数)

#include <stdio.h>
#include <stdarg.h>
void myprintf(const char *format, ...)
{
va_list ap;
char c;
va_start(ap, format);
while (c = *format++) {
switch(c) {
case 'c': {
char ch = va_arg(ap, int);
putchar(ch);
break;
}
case 's': {
char *p = va_arg(ap, char *);
fputs(p, stdout);
break;
}
default:
putchar(c);
}
}
va_end(ap);
}
int main(void)
{
myprintf("c\ts\n", '', "hello");
return ;
}

  要处理可变参数,需要用C标准库的va_list类型和va_start、va_arg、va_end宏,这些定义在stdarg.h头文件中。我们首先对照反汇编分析在调用myprintf函数时这些参数的内存布局。

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" 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" alt="" />

  myprintf函数的参数布局

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" alt="" />

  这些参数是从右向左依次压栈的,所以第一个参数靠近着栈顶,第三个参数靠近栈底。这些参数在内存中是连续存放的,每个参数都对齐到4字节边界。第一个和第三个参数都是指针类型,各占4个字节,虽然第二个参数只占一个字节,但为了使第三个参数对齐到4字节边界,所以第二个参数也占4个字节。现在给出一个stdarg.h的简单实现

/* stdarg.h standard header */
#ifndef _STDARG
#define _STDARG
/* type definitions */
typedef char *va_list;
/* macros */
#define va_arg(ap, T) \
     (* (T *)(((ap) += _Bnd(T, 3U)) - _Bnd(T, 3U)))
#define va_end(ap) (void)0
#define va_start(ap, A) \
     (void)((ap) = (char *)&(A) + _Bnd(A, 3U))
#define _Bnd(X, bnd) (sizeof (X) + (bnd) & ~(bnd))
#endif

  这个头文件中的内部宏定义_Bnd(X, bnd)将类型或变量x的长度对齐到bnd+1字节的整数倍,例如_Bnd(char, 3U)的值是4, _Bnd(int, 3U)也是4。

  在myprintf中定义的va_list ap;其实是一个指针,va_start(ap, format)使ap指向format参数的下一个参数,也就是指向上图中esp+4的位置。然后va_arg(ap, int)把第二个参数的值按int型取出来,同时使ap指向第三个参数,也就是指向上图中esp+8的位置。然后va_arg(ap, char *)把第三个参数的值按char *型取出来,同时使ap指向更高的地址。va_end(ap)在我们的简单实现中不起任何作用,在有些实现中可能把ap改写成无效值,C标准要求在函数返回前调用va_end。

  如果把myprintf中的char ch = va_arg(ap, int);改成char ch = va_arg(ap, char);,用我们的简单实现是没有问题的。但如果改用libc提供的stdarg.h,在编译时会报错:

  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" alt="" />

  因此要求char型的可变参数必须按int型来取,这是为了与C标准一致。

  从myprintf的例子可以理解printf的实现原理,printf函数根据第一个参数(格式化字符串)来确定后面有集合参数,分别是什么类型。

  还有一种方法可以确定可变参数的个数,就是在参数列表的末尾传一个Sentinel,例如NULL。execl()就采用了这种方法确定参数的个数。

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