snprintf.c

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 * ________________________________________________________________
 * National Laboratory for Applied Network Research 
 * National Center for Supercomputing Applications 
 * University of Illinois at Urbana-Champaign 
 * http://www.ncsa.uiuc.edu
 * ________________________________________________________________ 
 * Author: Mark Gates
 *
 * snprintf.c
 *
 * This is from
 * W. Richard Stevens, 'UNIX Network Programming', Vol 1, 2nd Edition,
 *   Prentice Hall, 1998.
 *
 *
 * Throughout the book I use snprintf() because it's safer than sprintf().
 * But as of the time of this writing, not all systems provide this
 * function.  The function below should only be built on those systems
 * that do not provide a real snprintf().
 * The function below just acts like sprintf(); it is not safe, but it
 * tries to detect overflow.
 * ________________________________________________________________ */

#ifdef HAVE_CONFIG_H
    #include "config.h"
#endif

#ifndef HAVE_SNPRINTF

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

    #include "snprintf.h"

    #ifdef __cplusplus
extern "C" {
#endif

int snprintf(char *buf, size_t size, const char *fmt, ...) {
    int n;
    va_list ap;

    va_start(ap, fmt);
    vsprintf(buf, fmt, ap); /* Sigh, some vsprintf's return ptr, not length */
    n = strlen(buf);
    va_end(ap);

    if ( n >= size ) {
        fprintf( stderr, "snprintf: overflowed array\n" );
        exit(1);
    }

    return(n);
}

#ifdef __cplusplus
} /* end extern "C" */
    #endif

#endif /* HAVE_SNPRINTF */