Program to write ‘printf’

May 16th, 2009  |  Published in Linux Sample Programs








#include <stdio.h>
#include <stdarg.h>
/* minprintf: minimal printf with variable argument list */
void minprintf(char *fmt, …)
{
va_list ap;
/* points to each unnamed arg in turn */
char *p, *sval;
int ival;
double dval;
va_start(ap, fmt);
/* make ap point to 1st unnamed arg */
for (p = fmt; *p; p++) {
if (*p != ‘%’) {
putchar(*p);
continue;
}
switch (*++p) {
case ‘d’:
ival = va_arg(ap, int);
printf(“%d”, ival);
break;
case ‘f’:
dval = va_arg(ap, double);
printf(“%f”, dval);
break;
case ‘s’:
for (sval = va_arg(ap, char *); *sval; sval++)
putchar(*sval);
break;
default:
putchar(*p);
break;
}
}
va_end(ap);
/* clean up when done */
}
int main()
{
minprintf(“%d – %d – %s \n”,4,5,”amit”);
return 0;
}

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