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/*

 * task2.c -- a simple task

 */

#include "putchar.h"

#include "stdarg.h"

/**************************************************************/

void puts(char *s) {

  char c;

  while ((c = *s++) != '\0') {

    putchar(c);

  }

}

void printn(int n) {

  int a;

  if (n < 0) {

    putchar('-');

    n = -n;

  }

  a = n / 10;

  if (a != 0) {

    printn(a);

  }

  putchar(n % 10 + '0');

}

void printu(unsigned int n, unsigned int b) {

  unsigned int a;

  a = n / b;

  if (a != 0) {

    printu(a, b);

  }

  putchar("0123456789ABCDEF"[n % b]);

}

void printf(char *fmt, ...) {

  va_list ap;

  char c;

  int n;

  unsigned int u;

  char *s;

  va_start(ap, fmt);

  while (1) {

    while ((c = *fmt++) != '%') {

      if (c == '\0') {

        va_end(ap);

        return;

      }

      putchar(c);

    }

    c = *fmt++;

    if (c == 'd') {

      n = va_arg(ap, int);

      printn(n);

    } else

    if (c == 'u' || c == 'o' || c == 'x') {

      u = va_arg(ap, int);

      printu(u, c == 'o' ? 8 : (c == 'x' ? 16 : 10));

    } else

    if (c == 's') {

      s = va_arg(ap, char *);

      puts(s);

    } else {

      putchar(c);

    }

  }

}

/**************************************************************/

void main(void) {

  int i;

  printf("TASK2: executing...\n");

  i = 0;

  while (1) {

    printf("TASK2: %d\n", i);

    i++;

  }

}