Zilog Z8F0130 - Manual (Page 499)

UM013037-1212 va_end
Zilog Developer Studio II – Z8 Encore!
User Manual
475
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

extern void f2(int n, char *array[]);

#define MAXARGS 31

void f1(int n_ptrs,...) {

va_list ap;

char *array[MAXARGS];
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int ptr_no = 0;
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if (n_ptrs > MAXARGS)
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n_ptrs = MAXARGS;
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va_start(ap, n_ptrs);
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while (ptr_no < n_ptrs)
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array[ptr_no++] = va_arg(ap, char *);
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va_end(ap);
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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_end
Facilitates a normal return from the function whose variable argument list was referenced
by the expansion of
va_start that initialized the va_list ap . The va_end function
can modify ap so that it is no longer usable (without an intervening invocation of
va_start ). If the va_end function is not invoked before the return, the behavior is unde-
fined.
Synopsis
#include

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

extern void f2(int n, char *array[]);

#define MAXARGS 31

void f1(int n_ptrs,...) {

va_list ap;
