formatstring.c

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#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
 
#include "formatstring.h"
 
// formatstring()
char* formatstring(const char* format, ...)
{
    va_list args;
    va_start(args, format);
    va_list args2;
    va_copy(args2, args);
    int numCharsNeeded = 0;
    char *buffer = NULL;
    if (format != NULL)
    {
        numCharsNeeded = vsnprintf(NULL, 0, format, args) + 1;
        buffer = calloc(numCharsNeeded, sizeof(char));
        if (buffer != NULL)
        {
            vsnprintf(buffer, numCharsNeeded, format, args2);
        }
    }
    else
    {
        buffer = calloc(1, sizeof(char));
    }
    va_end(args2);
    va_end(args);
 
    return buffer;
}