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/*
* Ivy, C interface
*
* Copyright 1997-2000
* Centre d'Etudes de la Navigation Aerienne
*
* Sockets
*
* Authors: Francois-Regis Colin <fcolin@cena.fr>
*
* $Id$
*
* Please refer to file version.h for the
* copyright notice regarding this software
*/
#ifdef WIN32
#include <windows.h>
#endif
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#ifdef WIN32
#define snprintf _snprintf
#endif
#include "param.h"
#include "ivybuffer.h"
/* fonction de formtage a la printf d'un buffer avec reallocation dynamique */
int make_message(IvyBuffer* buffer, const char *fmt, va_list ap)
{
/* Guess we need no more than BUFFER_INIT_SIZE bytes. */
int n;
va_list ap_copy;
if ( buffer->size == 0 || buffer->data == NULL )
{
buffer->size = IVY_BUFFER_SIZE;
buffer->offset = 0;
buffer->data = malloc (IVY_BUFFER_SIZE);
if ( buffer->data == NULL )
{
perror(" Ivy make message MALLOC error: " );
return -1;
}
}
while (1) {
/* Try to print in the allocated space. */
#ifdef WIN32
ap_copy = ap;
n = _vsnprintf (buffer->data + buffer->offset, buffer->size - buffer->offset, fmt, ap_copy);
#else
va_copy( ap_copy, ap );
n = vsnprintf (buffer->data + buffer->offset, buffer->size - buffer->offset, fmt, ap_copy);
#endif
va_end(ap_copy);
/* If that worked, return the string size. */
if (n > -1 && n < (buffer->size - buffer->offset))
{
buffer->offset += n;
return n;
}
/* Else try again with more space. */
if (n > -1) /* glibc 2.1 */
buffer->size = buffer->offset + n+1; /* precisely what is needed */
else /* glibc 2.0 */
buffer->size *= 2; /* twice the old size */
if ((buffer->data = realloc (buffer->data, buffer->size)) == NULL)
{
perror(" Ivy make message REALLOC error: " );
return -1;
}
}
}
int make_message_var(IvyBuffer* buffer, const char *fmt, ... )
{
va_list ap;
int len;
va_start (ap, fmt );
len = make_message (buffer, fmt, ap );
va_end (ap );
return len;
}
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