/* * "$Id: vsnprintf.c,v 1.1.1.1 2003/08/07 21:18:41 jasonk Exp $" * * vsnprintf() function for the Fast Light Tool Kit (FLTK). * * Emulates this call on systems that lack it (pretty much everything * except glibc systems). * * KNOWN BUGS: * * Field width & Precision is ignored for %%, %c, and %s. * * A malicious user who manages to create a %-fmt string that prints * more than 99 characters can still overflow the temporary buffer. * For instance %110f will overflow. * * Only handles formats that are both documented in the glibc man page * for printf and also handled by your system's sprintf(). * * Copyright 1998-1999 by Bill Spitzak and others. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA. * * Please report all bugs and problems to "fltk-bugs@easysw.com". */#include <stdio.h>#include <stdarg.h>#include <config.h>#if !HAVE_VSNPRINTF#ifdef __cplusplusextern "C" {#endifint vsnprintf(char* str, size_t size, const char* fmt, va_list ap) {  const char* e = str+size-1;  char* p = str;  char copy[20];  char* copy_p;  char sprintf_out[100];  while (*fmt && p < e) {    if (*fmt != '%') {      *p++ = *fmt++;    } else {      fmt++;      copy[0] = '%';      for (copy_p = copy+1; copy_p < copy+19;) {	switch ((*copy_p++ = *fmt++)) {	case 0:	  fmt--; goto CONTINUE;	case '%':	  *p++ = '%'; goto CONTINUE;	case 'c':	  *p++ = va_arg(ap, int);	  goto CONTINUE;	case 'd':	case 'i':	case 'o':	case 'u':	case 'x':	case 'X':	  *copy_p = 0;	  sprintf(sprintf_out, copy, va_arg(ap, int));	  copy_p = sprintf_out;	  goto DUP;	case 'e':	case 'E':	case 'f':	case 'g':	  *copy_p = 0;	  sprintf(sprintf_out, copy, va_arg(ap, double));	  copy_p = sprintf_out;	  goto DUP;	case 'p':	  *copy_p = 0;	  sprintf(sprintf_out, copy, va_arg(ap, void*));	  copy_p = sprintf_out;	  goto DUP;	case 'n':	  *(va_arg(ap, int*)) = p-str;	  goto CONTINUE;	case 's':	  copy_p = va_arg(ap, char*);	  if (!copy_p) copy_p = "NULL";	DUP:	  while (*copy_p && p < e) *p++ = *copy_p++;	  goto CONTINUE;	}      }    }  CONTINUE:;  }  *p = 0;  if (*fmt) return -1;  return p-str;}#endif#if !HAVE_SNPRINTFint snprintf(char* str, size_t size, const char* fmt, ...) {  int ret;  va_list ap;  va_start(ap, fmt);  ret = vsnprintf(str, size, fmt, ap);  va_end(ap);  return ret;}#ifdef __cplusplus}#endif#endif/* * End of "$Id: vsnprintf.c,v 1.1.1.1 2003/08/07 21:18:41 jasonk Exp $". */