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Try this snprintf() implementation, used in sendmail...

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pull/50/head
Marc G. Fournier 28 years ago
parent 370d6cdb64
commit edd626cb3e
1 changed files with 309 additions and 58 deletions
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  1. 367
      src/backend/port/snprintf.c

367
src/backend/port/snprintf.c
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@ -1,30 +1,28 @@
/*-
* Copyright (c) 1990, 1993
/*
* Copyright (c) 1983, 1995, 1996 Eric P. Allman
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
@ -34,59 +32,312 @@
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93";
# include "sendmail.h"
# include "pathnames.h"
# include <sys/ioctl.h>
# include <sys/param.h>
#endif
static const char rcsid[] =
"$Id: snprintf.c,v 1.3 1998/09/01 04:30:44 momjian Exp $";
/*
** SNPRINTF, VSNPRINT -- counted versions of printf
**
** These versions have been grabbed off the net. They have been
** cleaned up to compile properly and support for .precision and
** %lx has been added.
*/
#endif /* LIBC_SCCS and not lint */
/**************************************************************
* Original:
* Patrick Powell Tue Apr 11 09:48:21 PDT 1995
* A bombproof version of doprnt (dopr) included.
* Sigh. This sort of thing is always nasty do deal with. Note that
* the version here does not include floating point...
*
* snprintf() is used instead of sprintf() as it does limit checks
* for string length. This covers a nasty loophole.
*
* The other functions are there to prevent NULL pointers from
* causing nast effects.
**************************************************************/
#include <limits.h>
#include <stdio.h>
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
/*static char _id[] = "$Id: snprintf.c,v 1.4 1998/09/04 14:34:23 scrappy Exp $";*/
static void dopr();
static char *end;
static int SnprfOverflow;
#if __STDC__
/* VARARGS3 */
int
snprintf(char *str, size_t n, char const * fmt,...)
#else
# ifdef __STDC__
snprintf(char *str, size_t count, const char *fmt, ...)
# else
snprintf(str, count, fmt, va_alist)
char *str;
size_t count;
const char *fmt;
va_dcl
#endif
{
int len;
VA_LOCAL_DECL
VA_START(fmt);
len = vsnprintf(str, count, fmt, ap);
VA_END;
return len;
}
# ifndef luna2
int
snprintf(str, n, fmt, va_alist)
char *str;
size_t n;
char *fmt;
vsnprintf(str, count, fmt, args)
char *str;
size_t count;
const char *fmt;
va_list args;
{
str[0] = 0;
end = str + count - 1;
SnprfOverflow = 0;
dopr( str, fmt, args );
if (count > 0)
end[0] = 0;
if (SnprfOverflow && tTd(57, 2))
printf("\nvsnprintf overflow, len = %d, str = %s",
count, shortenstring(str, 203));
return strlen(str);
}
va_dcl
#endif
/*
* dopr(): poor man's version of doprintf
*/
static void fmtstr __P((char *value, int ljust, int len, int zpad, int maxwidth));
static void fmtnum __P((long value, int base, int dosign, int ljust, int len, int zpad));
static void dostr __P(( char * , int ));
static char *output;
static void dopr_outch __P(( int c ));
static void
dopr( buffer, format, args )
char *buffer;
const char *format;
va_list args;
{
size_t on;
int ret;
va_list ap;
FILE f;
on = n;
if (n != 0)
n--;
if (n > INT_MAX)
n = INT_MAX;
#if __STDC__
va_start(ap, fmt);
#else
va_start(ap);
int ch;
long value;
int longflag = 0;
int pointflag = 0;
int maxwidth = 0;
char *strvalue;
int ljust;
int len;
int zpad;
output = buffer;
while( (ch = *format++) ){
switch( ch ){
case '%':
ljust = len = zpad = maxwidth = 0;
longflag = pointflag = 0;
nextch:
ch = *format++;
switch( ch ){
case 0:
dostr( "**end of format**" , 0);
return;
case '-': ljust = 1; goto nextch;
case '0': /* set zero padding if len not set */
if(len==0 && !pointflag) zpad = '0';
case '1': case '2': case '3':
case '4': case '5': case '6':
case '7': case '8': case '9':
if (pointflag)
maxwidth = maxwidth*10 + ch - '0';
else
len = len*10 + ch - '0';
goto nextch;
case '*':
if (pointflag)
maxwidth = va_arg( args, int );
else
len = va_arg( args, int );
goto nextch;
case '.': pointflag = 1; goto nextch;
case 'l': longflag = 1; goto nextch;
case 'u': case 'U':
/*fmtnum(value,base,dosign,ljust,len,zpad) */
if( longflag ){
value = va_arg( args, long );
} else {
value = va_arg( args, int );
}
fmtnum( value, 10,0, ljust, len, zpad ); break;
case 'o': case 'O':
/*fmtnum(value,base,dosign,ljust,len,zpad) */
if( longflag ){
value = va_arg( args, long );
} else {
value = va_arg( args, int );
}
fmtnum( value, 8,0, ljust, len, zpad ); break;
case 'd': case 'D':
if( longflag ){
value = va_arg( args, long );
} else {
value = va_arg( args, int );
}
fmtnum( value, 10,1, ljust, len, zpad ); break;
case 'x':
if( longflag ){
value = va_arg( args, long );
} else {
value = va_arg( args, int );
}
fmtnum( value, 16,0, ljust, len, zpad ); break;
case 'X':
if( longflag ){
value = va_arg( args, long );
} else {
value = va_arg( args, int );
}
fmtnum( value,-16,0, ljust, len, zpad ); break;
case 's':
strvalue = va_arg( args, char *);
if (maxwidth > 0 || !pointflag) {
if (pointflag && len > maxwidth)
len = maxwidth; /* Adjust padding */
fmtstr( strvalue,ljust,len,zpad, maxwidth);
}
break;
case 'c':
ch = va_arg( args, int );
dopr_outch( ch ); break;
case '%': dopr_outch( ch ); continue;
default:
dostr( "???????" , 0);
}
break;
default:
dopr_outch( ch );
break;
}
}
*output = 0;
}
static void
fmtstr( value, ljust, len, zpad, maxwidth )
char *value;
int ljust, len, zpad, maxwidth;
{
int padlen, strlen; /* amount to pad */
if( value == 0 ){
value = "<NULL>";
}
for( strlen = 0; value[strlen]; ++ strlen ); /* strlen */
if (strlen > maxwidth && maxwidth)
strlen = maxwidth;
padlen = len - strlen;
if( padlen < 0 ) padlen = 0;
if( ljust ) padlen = -padlen;
while( padlen > 0 ) {
dopr_outch( ' ' );
--padlen;
}
dostr( value, maxwidth );
while( padlen < 0 ) {
dopr_outch( ' ' );
++padlen;
}
}
static void
fmtnum( value, base, dosign, ljust, len, zpad )
long value;
int base, dosign, ljust, len, zpad;
{
int signvalue = 0;
unsigned long uvalue;
char convert[20];
int place = 0;
int padlen = 0; /* amount to pad */
int caps = 0;
/* DEBUGP(("value 0x%x, base %d, dosign %d, ljust %d, len %d, zpad %d\n",
value, base, dosign, ljust, len, zpad )); */
uvalue = value;
if( dosign ){
if( value < 0 ) {
signvalue = '-';
uvalue = -value;
}
}
if( base < 0 ){
caps = 1;
base = -base;
}
do{
convert[place++] =
(caps? "0123456789ABCDEF":"0123456789abcdef")
[uvalue % (unsigned)base ];
uvalue = (uvalue / (unsigned)base );
}while(uvalue);
convert[place] = 0;
padlen = len - place;
if( padlen < 0 ) padlen = 0;
if( ljust ) padlen = -padlen;
/* DEBUGP(( "str '%s', place %d, sign %c, padlen %d\n",
convert,place,signvalue,padlen)); */
if( zpad && padlen > 0 ){
if( signvalue ){
dopr_outch( signvalue );
--padlen;
signvalue = 0;
}
while( padlen > 0 ){
dopr_outch( zpad );
--padlen;
}
}
while( padlen > 0 ) {
dopr_outch( ' ' );
--padlen;
}
if( signvalue ) dopr_outch( signvalue );
while( place > 0 ) dopr_outch( convert[--place] );
while( padlen < 0 ){
dopr_outch( ' ' );
++padlen;
}
}
static void
dostr( str , cut)
char *str;
int cut;
{
if (cut) {
while(*str && cut-- > 0) dopr_outch(*str++);
} else {
while(*str) dopr_outch(*str++);
}
}
static void
dopr_outch( c )
int c;
{
#if 0
if( iscntrl(c) && c != '\n' && c != '\t' ){
c = '@' + (c & 0x1F);
if( end == 0 || output < end )
*output++ = '^';
}
#endif
f._file = -1;
f._flags = __SWR | __SSTR;
f._bf._base = f._p = (unsigned char *) str;
f._bf._size = f._w = n;
ret = vfprintf(&f, fmt, ap);
if (on > 0)
*f._p = '\0';
va_end(ap);
return ret;
if( end == 0 || output < end )
*output++ = c;
else
SnprfOverflow++;
}
# endif /* !luna2 */

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