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int printf(const char *format, ...)

Johnny Alejandro Urán Arboleda answered on March 23, 2022 Popularity 7/10 Helpfulness 1/10

answer int printf(const char *format, ...)

int printf(const char *format, ...)

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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

char *
make_message(const char *fmt, ...)
{
    int n;
    int size = 100;     /* Guess we need no more than 100 bytes */
    char *p, *np;
    va_list ap;

   if ((p = malloc(size)) == NULL)
        return NULL;

   while (1) {

       /* Try to print in the allocated space */

       va_start(ap, fmt);
        n = vsnprintf(p, size, fmt, ap);
        va_end(ap);

       /* Check error code */

       if (n < 0)
            return NULL;

       /* If that worked, return the string */

       if (n < size)
            return p;

       /* Else try again with more space */

       size = n + 1;       /* Precisely what is needed */

       if ((np = realloc (p, size)) == NULL) {
            free(p);
            return NULL;
        } else {
            p = np;
        }
    }
}

Popularity 7/10 Helpfulness 1/10 Language whatever

Source: linux.die.net

Tags: int whatever

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Contributed on Mar 23 2022

Johnny Alejandro Urán Arboleda

0 Answers Avg Quality 2/10

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