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Try this snprintf() implementation, used in sendmail...
This commit is contained in:
Marc G. Fournier
parent
370d6cdb64
commit
edd626cb3e
@ -1,30 +1,28 @@
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/*-
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* Copyright (c) 1990, 1993
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/*
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* Copyright (c) 1983, 1995, 1996 Eric P. Allman
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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@ -34,59 +32,312 @@
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93";
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# include "sendmail.h"
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# include "pathnames.h"
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# include <sys/ioctl.h>
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# include <sys/param.h>
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#endif
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static const char rcsid[] =
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"$Id: snprintf.c,v 1.3 1998/09/01 04:30:44 momjian Exp $";
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/*
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** SNPRINTF, VSNPRINT -- counted versions of printf
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**
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** These versions have been grabbed off the net. They have been
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** cleaned up to compile properly and support for .precision and
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** %lx has been added.
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*/
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#endif /* LIBC_SCCS and not lint */
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/**************************************************************
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* Original:
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* Patrick Powell Tue Apr 11 09:48:21 PDT 1995
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* A bombproof version of doprnt (dopr) included.
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* Sigh. This sort of thing is always nasty do deal with. Note that
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* the version here does not include floating point...
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*
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* snprintf() is used instead of sprintf() as it does limit checks
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* for string length. This covers a nasty loophole.
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*
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* The other functions are there to prevent NULL pointers from
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* causing nast effects.
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**************************************************************/
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#include <limits.h>
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#include <stdio.h>
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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/*static char _id[] = "$Id: snprintf.c,v 1.4 1998/09/04 14:34:23 scrappy Exp $";*/
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static void dopr();
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static char *end;
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static int SnprfOverflow;
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#if __STDC__
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/* VARARGS3 */
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int
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snprintf(char *str, size_t n, char const * fmt,...)
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#else
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int
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snprintf(str, n, fmt, va_alist)
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char *str;
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size_t n;
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char *fmt;
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va_dcl
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# ifdef __STDC__
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snprintf(char *str, size_t count, const char *fmt, ...)
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# else
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snprintf(str, count, fmt, va_alist)
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char *str;
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size_t count;
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const char *fmt;
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va_dcl
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#endif
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{
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size_t on;
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int ret;
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va_list ap;
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FILE f;
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int len;
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VA_LOCAL_DECL
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on = n;
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if (n != 0)
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n--;
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if (n > INT_MAX)
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n = INT_MAX;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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f._file = -1;
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f._flags = __SWR | __SSTR;
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f._bf._base = f._p = (unsigned char *) str;
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f._bf._size = f._w = n;
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ret = vfprintf(&f, fmt, ap);
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if (on > 0)
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*f._p = '\0';
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va_end(ap);
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return ret;
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VA_START(fmt);
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len = vsnprintf(str, count, fmt, ap);
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VA_END;
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return len;
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}
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# ifndef luna2
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int
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vsnprintf(str, count, fmt, args)
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char *str;
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size_t count;
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const char *fmt;
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va_list args;
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{
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str[0] = 0;
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end = str + count - 1;
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SnprfOverflow = 0;
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dopr( str, fmt, args );
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if (count > 0)
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end[0] = 0;
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if (SnprfOverflow && tTd(57, 2))
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printf("\nvsnprintf overflow, len = %d, str = %s",
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count, shortenstring(str, 203));
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return strlen(str);
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}
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/*
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* dopr(): poor man's version of doprintf
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*/
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static void fmtstr __P((char *value, int ljust, int len, int zpad, int maxwidth));
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static void fmtnum __P((long value, int base, int dosign, int ljust, int len, int zpad));
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static void dostr __P(( char * , int ));
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static char *output;
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static void dopr_outch __P(( int c ));
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static void
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dopr( buffer, format, args )
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char *buffer;
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const char *format;
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va_list args;
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{
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int ch;
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long value;
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int longflag = 0;
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int pointflag = 0;
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int maxwidth = 0;
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char *strvalue;
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int ljust;
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int len;
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int zpad;
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output = buffer;
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while( (ch = *format++) ){
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switch( ch ){
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case '%':
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ljust = len = zpad = maxwidth = 0;
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longflag = pointflag = 0;
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nextch:
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ch = *format++;
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switch( ch ){
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case 0:
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dostr( "**end of format**" , 0);
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return;
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case '-': ljust = 1; goto nextch;
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case '0': /* set zero padding if len not set */
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if(len==0 && !pointflag) zpad = '0';
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case '1': case '2': case '3':
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case '4': case '5': case '6':
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case '7': case '8': case '9':
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if (pointflag)
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maxwidth = maxwidth*10 + ch - '0';
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else
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len = len*10 + ch - '0';
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goto nextch;
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case '*':
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if (pointflag)
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maxwidth = va_arg( args, int );
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else
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len = va_arg( args, int );
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goto nextch;
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case '.': pointflag = 1; goto nextch;
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case 'l': longflag = 1; goto nextch;
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case 'u': case 'U':
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/*fmtnum(value,base,dosign,ljust,len,zpad) */
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if( longflag ){
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value = va_arg( args, long );
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} else {
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value = va_arg( args, int );
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}
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fmtnum( value, 10,0, ljust, len, zpad ); break;
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case 'o': case 'O':
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/*fmtnum(value,base,dosign,ljust,len,zpad) */
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if( longflag ){
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value = va_arg( args, long );
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} else {
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value = va_arg( args, int );
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}
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fmtnum( value, 8,0, ljust, len, zpad ); break;
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case 'd': case 'D':
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if( longflag ){
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value = va_arg( args, long );
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} else {
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value = va_arg( args, int );
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}
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fmtnum( value, 10,1, ljust, len, zpad ); break;
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case 'x':
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if( longflag ){
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value = va_arg( args, long );
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} else {
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value = va_arg( args, int );
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}
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fmtnum( value, 16,0, ljust, len, zpad ); break;
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case 'X':
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if( longflag ){
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value = va_arg( args, long );
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} else {
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value = va_arg( args, int );
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}
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fmtnum( value,-16,0, ljust, len, zpad ); break;
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case 's':
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strvalue = va_arg( args, char *);
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if (maxwidth > 0 || !pointflag) {
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if (pointflag && len > maxwidth)
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len = maxwidth; /* Adjust padding */
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fmtstr( strvalue,ljust,len,zpad, maxwidth);
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}
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break;
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case 'c':
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ch = va_arg( args, int );
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dopr_outch( ch ); break;
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case '%': dopr_outch( ch ); continue;
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default:
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dostr( "???????" , 0);
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}
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break;
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default:
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dopr_outch( ch );
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break;
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}
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}
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*output = 0;
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}
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static void
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fmtstr( value, ljust, len, zpad, maxwidth )
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char *value;
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int ljust, len, zpad, maxwidth;
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{
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int padlen, strlen; /* amount to pad */
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if( value == 0 ){
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value = "<NULL>";
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}
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for( strlen = 0; value[strlen]; ++ strlen ); /* strlen */
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if (strlen > maxwidth && maxwidth)
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strlen = maxwidth;
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padlen = len - strlen;
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if( padlen < 0 ) padlen = 0;
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if( ljust ) padlen = -padlen;
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while( padlen > 0 ) {
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dopr_outch( ' ' );
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--padlen;
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}
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dostr( value, maxwidth );
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while( padlen < 0 ) {
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dopr_outch( ' ' );
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++padlen;
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}
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}
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static void
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fmtnum( value, base, dosign, ljust, len, zpad )
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long value;
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int base, dosign, ljust, len, zpad;
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{
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int signvalue = 0;
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unsigned long uvalue;
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char convert[20];
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int place = 0;
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int padlen = 0; /* amount to pad */
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int caps = 0;
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/* DEBUGP(("value 0x%x, base %d, dosign %d, ljust %d, len %d, zpad %d\n",
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value, base, dosign, ljust, len, zpad )); */
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uvalue = value;
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if( dosign ){
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if( value < 0 ) {
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signvalue = '-';
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uvalue = -value;
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}
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}
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if( base < 0 ){
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caps = 1;
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base = -base;
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}
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do{
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convert[place++] =
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(caps? "0123456789ABCDEF":"0123456789abcdef")
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[uvalue % (unsigned)base ];
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uvalue = (uvalue / (unsigned)base );
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}while(uvalue);
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convert[place] = 0;
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padlen = len - place;
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if( padlen < 0 ) padlen = 0;
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if( ljust ) padlen = -padlen;
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/* DEBUGP(( "str '%s', place %d, sign %c, padlen %d\n",
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convert,place,signvalue,padlen)); */
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if( zpad && padlen > 0 ){
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if( signvalue ){
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dopr_outch( signvalue );
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--padlen;
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signvalue = 0;
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}
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while( padlen > 0 ){
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dopr_outch( zpad );
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--padlen;
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}
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}
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while( padlen > 0 ) {
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dopr_outch( ' ' );
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--padlen;
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}
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if( signvalue ) dopr_outch( signvalue );
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while( place > 0 ) dopr_outch( convert[--place] );
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while( padlen < 0 ){
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dopr_outch( ' ' );
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++padlen;
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}
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}
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static void
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dostr( str , cut)
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char *str;
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int cut;
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{
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if (cut) {
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while(*str && cut-- > 0) dopr_outch(*str++);
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} else {
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while(*str) dopr_outch(*str++);
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}
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}
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static void
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dopr_outch( c )
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int c;
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{
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#if 0
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if( iscntrl(c) && c != '\n' && c != '\t' ){
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c = '@' + (c & 0x1F);
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if( end == 0 || output < end )
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*output++ = '^';
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}
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#endif
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if( end == 0 || output < end )
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*output++ = c;
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else
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SnprfOverflow++;
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}
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# endif /* !luna2 */
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