mirror of https://github.com/fltk/fltk
Added vsnprintf() emulation code.
git-svn-id: file:///fltk/svn/fltk/trunk@53 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
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/*
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* "$Id: vsnprintf.c,v 1.1 1998/11/05 16:07:45 mike Exp $"
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*
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* vsnprintf() function for the Fast Light Tool Kit (FLTK).
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*
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* Emulates this call on systems that lack it (pretty much everything
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* except glibc systems).
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*
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* KNOWN BUGS:
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*
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* Field width & Precision is ignored for %%, %c, and %s.
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*
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* A malicious user who manages to create a %-fmt string that prints
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* more than 99 characters can still overflow the temporary buffer.
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* For instance %110f will overflow.
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*
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* Only handles formats that are both documented in the glibc man page
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* for printf and also handled by your system's sprintf().
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*
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* Copyright 1998 by Bill Spitzak and others.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA.
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*
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* Please report all bugs and problems to "fltk-bugs@easysw.com".
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <config.h>
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#if !HAVE_VSNPRINTF
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int vsnprintf(char* str, size_t size, const char* fmt, va_list ap) {
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const char* e = str+size-1;
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char* p = str;
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char copy[20];
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char* copy_p;
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char sprintf_out[100];
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while (*fmt && p < e) {
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if (*fmt != '%') {
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*p++ = *fmt++;
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} else {
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fmt++;
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copy[0] = '%';
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for (copy_p = copy+1; copy_p < copy+19;) {
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switch ((*copy_p++ = *fmt++)) {
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case 0:
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fmt--; goto CONTINUE;
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case '%':
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*p++ = '%'; goto CONTINUE;
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case 'c':
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*p++ = va_arg(ap, int);
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goto CONTINUE;
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case 'd':
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case 'i':
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case 'o':
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case 'u':
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case 'x':
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case 'X':
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*copy_p = 0;
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sprintf(sprintf_out, copy, va_arg(ap, int));
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copy_p = sprintf_out;
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goto DUP;
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case 'e':
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case 'E':
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case 'f':
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case 'g':
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*copy_p = 0;
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sprintf(sprintf_out, copy, va_arg(ap, double));
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copy_p = sprintf_out;
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goto DUP;
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case 'p':
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*copy_p = 0;
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sprintf(sprintf_out, copy, va_arg(ap, void*));
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copy_p = sprintf_out;
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goto DUP;
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case 'n':
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*(va_arg(ap, int*)) = p-str;
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goto CONTINUE;
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case 's':
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copy_p = va_arg(ap, char*);
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if (!copy_p) copy_p = "NULL";
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DUP:
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while (*copy_p && p < e) *p++ = *copy_p++;
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goto CONTINUE;
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}
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}
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}
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CONTINUE:;
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}
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*p = 0;
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if (*fmt) return -1;
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return p-str;
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}
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#endif
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#if !HAVE_SNPRINTF
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int snprintf(char* str, size_t size, const char* fmt, ...) {
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int ret;
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va_list ap;
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va_start(ap, fmt);
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ret = vsnprintf(str, size, fmt, ap);
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va_end(ap);
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return ret;
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}
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#endif
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/*
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* End of "$Id: vsnprintf.c,v 1.1 1998/11/05 16:07:45 mike Exp $".
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*/
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