Zilog ZUSBOPTS Manual do Utilizador descarregar pdf (Página 483)

100

101

UM017105-0511 Standard Functions

Zilog Developer Studio II – ZNEO™

User Manual

455

Synopsis

#include <stdarg.h>

void va_end(va_list ap);

Example

The function f1 gathers into an array a list of arguments that are pointers to strings (but not

more than MAXARGS arguments), then passes the array as a single argument to function

f2. The number of pointers is specified by the first argument to f1.

#include <stdarg.h>

extern void f2(int n, char *array[]);

#define MAXARGS 31

void f1(int n_ptrs,...) {

va_list ap; 

char *array[MAXARGS];

int ptr_no = 0;

if (n_ptrs > MAXARGS)

n_ptrs = MAXARGS;

va_start(ap, n_ptrs);

while (ptr_no < n_ptrs)

array[ptr_no++] = va_arg(ap, char *);

va_end(ap);

f2(n_ptrs, array);

}

Each call to f1 has in scope the definition of the function of a declaration such as void

f1(int, ...);

va_start

Is executed before any access to the unnamed arguments.

The parameter

ap points to an object that has type va_list. The parameter parmN is the

identifier of the rightmost parameter in the variable parameter list in the function defini-

tion (the one just before the , ...). The

va_start macro initializes ap for subsequent use

va_arg and va_end.

Synopsis

#include <stdarg.h>

void va_start(va_list ap, parmN);

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