Subversion Repositories openrisc_2011-10-31

/* varargs.c -

 * (Added as part of fix for bug 15306 - "call" to varargs functions fails)

 * This program is intended to let me try out "call" to varargs functions

 * with varying numbers of declared args and various argument types.

 * - RT 9/27/95

 */

#include <stdio.h>

#include <stdarg.h>

int find_max1(int, ...);

int find_max2(int, int, ...);

double find_max_double(int, double, ...);

char ch;

unsigned char uc;

short s;

unsigned short us;

int a,b,c,d;

int max_val;

long long ll;

float fa,fb,fc,fd;

double da,db,dc,dd;

double dmax_val;

int main() {

  c = -1;

  uc = 1;

  s = -2;

  us = 2;

  a = 1;

  b = 60;

  max_val = find_max1(1, 60);

  max_val = find_max1(a, b);

  a = 3;

  b = 1;

  c = 4;

  d = 2;

  max_val = find_max1(3, 1, 4, 2);

  max_val = find_max2(a, b, c, d);

  da = 3.0;

  db = 1.0;

  dc = 4.0;

  dd = 2.0;

  dmax_val = find_max_double(3, 1.0, 4.0, 2.0);

  dmax_val = find_max_double(a, db, dc, dd);

  return 0;

}

/* Integer varargs, 1 declared arg */

int find_max1(int num_vals, ...) {

  int max_val = 0;

  int x;

  int i;

  va_list argp;

  va_start(argp, num_vals);

  printf("find_max(%d,", num_vals);

  for (i = 0; i < num_vals; i++) {

    x = va_arg(argp, int);

    if (max_val < x) max_val = x;

    if (i < num_vals - 1)

      printf(" %d,", x);

    else

      printf(" %d)", x);

  }

  printf(" returns %d\n", max_val);

  return max_val;

}

/* Integer varargs, 2 declared args */

int find_max2(int num_vals, int first_val, ...) {

  int max_val = 0;

  int x;

  int i;

  va_list argp;

  va_start(argp, first_val);

  x = first_val;

  if (max_val < x) max_val = x;

  printf("find_max(%d, %d", num_vals, first_val);

  for (i = 1; i < num_vals; i++) {

    x = va_arg(argp, int);

    if (max_val < x) max_val = x;

    printf(", %d", x);

  }

  printf(") returns %d\n", max_val);

  return max_val;

}

/* Double-float varargs, 2 declared args */

double find_max_double(int num_vals, double first_val, ...) {

  double max_val = 0;

  double x;

  int i;

  va_list argp;

  va_start(argp, first_val);

  x = first_val;

  if (max_val < x) max_val = x;

  printf("find_max(%d, %f", num_vals, first_val);

  for (i = 1; i < num_vals; i++) {

    x = va_arg(argp, double);

    if (max_val < x) max_val = x;

    printf(", %f", x);

  }

  printf(") returns %f\n", max_val);

  return max_val;

}