431 lines
11 KiB
C
431 lines
11 KiB
C
/*
|
||
* Copyright (c) 1998-2000 Sendmail, Inc. and its suppliers.
|
||
* All rights reserved.
|
||
* Copyright (c) 1997 Eric P. Allman. All rights reserved.
|
||
* Copyright (c) 1988, 1993
|
||
* The Regents of the University of California. All rights reserved.
|
||
*
|
||
* By using this file, you agree to the terms and conditions set
|
||
* forth in the LICENSE file which can be found at the top level of
|
||
* the sendmail distribution.
|
||
*
|
||
*/
|
||
|
||
#ifndef lint
|
||
static char id[] = "@(#)Id: snprintf.c,v 8.27.16.2 2000/09/17 17:04:24 gshapiro Exp";
|
||
#endif /* ! lint */
|
||
|
||
#include <sendmail.h>
|
||
|
||
/*
|
||
** 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.
|
||
*/
|
||
|
||
/**************************************************************
|
||
* Original:
|
||
* Patrick Powell Tue Apr 11 09:48:21 PDT 1995
|
||
* A bombproof version of doprnt (sm_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.
|
||
**************************************************************/
|
||
|
||
/*static char _id[] = "$OrigId: snprintf.c,v 1.2 1995/10/09 11:19:47 roberto Exp $";*/
|
||
void sm_dopr();
|
||
char *DoprEnd;
|
||
int SnprfOverflow;
|
||
|
||
#if !HASSNPRINTF && !SNPRINTF_IS_BROKEN
|
||
# define sm_snprintf snprintf
|
||
# ifndef luna2
|
||
# define sm_vsnprintf vsnprintf
|
||
extern int vsnprintf __P((char *, size_t, const char *, va_list));
|
||
# endif /* ! luna2 */
|
||
#endif /* !HASSNPRINTF && !SNPRINTF_IS_BROKEN */
|
||
|
||
/* VARARGS3 */
|
||
int
|
||
# ifdef __STDC__
|
||
sm_snprintf(char *str, size_t count, const char *fmt, ...)
|
||
# else /* __STDC__ */
|
||
sm_snprintf(str, count, fmt, va_alist)
|
||
char *str;
|
||
size_t count;
|
||
const char *fmt;
|
||
va_dcl
|
||
# endif /* __STDC__ */
|
||
{
|
||
int len;
|
||
VA_LOCAL_DECL
|
||
|
||
VA_START(fmt);
|
||
len = sm_vsnprintf(str, count, fmt, ap);
|
||
VA_END;
|
||
return len;
|
||
}
|
||
|
||
int
|
||
sm_vsnprintf(str, count, fmt, args)
|
||
char *str;
|
||
size_t count;
|
||
const char *fmt;
|
||
va_list args;
|
||
{
|
||
str[0] = 0;
|
||
DoprEnd = str + count - 1;
|
||
SnprfOverflow = 0;
|
||
sm_dopr( str, fmt, args );
|
||
if (count > 0)
|
||
DoprEnd[0] = 0;
|
||
if (SnprfOverflow && tTd(57, 2))
|
||
dprintf("\nvsnprintf overflow, len = %ld, str = %s",
|
||
(long) count, shortenstring(str, MAXSHORTSTR));
|
||
return strlen(str);
|
||
}
|
||
|
||
/*
|
||
* sm_dopr(): poor man's version of doprintf
|
||
*/
|
||
|
||
void fmtstr __P((char *value, int ljust, int len, int zpad, int maxwidth));
|
||
void fmtnum __P((long value, int base, int dosign, int ljust, int len, int zpad));
|
||
void dostr __P(( char * , int ));
|
||
char *output;
|
||
void dopr_outch __P(( int c ));
|
||
int SyslogErrno;
|
||
|
||
void
|
||
sm_dopr( buffer, format, args )
|
||
char *buffer;
|
||
const char *format;
|
||
va_list args;
|
||
{
|
||
int ch;
|
||
long value;
|
||
int longflag = 0;
|
||
int pointflag = 0;
|
||
int maxwidth = 0;
|
||
char *strvalue;
|
||
int ljust;
|
||
int len;
|
||
int zpad;
|
||
#if !HASSTRERROR && !defined(ERRLIST_PREDEFINED)
|
||
extern char *sys_errlist[];
|
||
extern int sys_nerr;
|
||
#endif /* !HASSTRERROR && !defined(ERRLIST_PREDEFINED) */
|
||
|
||
|
||
output = buffer;
|
||
while( (ch = *format++) != '\0' ){
|
||
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';
|
||
/* FALLTHROUGH */
|
||
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 'm':
|
||
#if HASSTRERROR
|
||
dostr(strerror(SyslogErrno), 0);
|
||
#else /* HASSTRERROR */
|
||
if (SyslogErrno < 0 || SyslogErrno >= sys_nerr)
|
||
{
|
||
dostr("Error ", 0);
|
||
fmtnum(SyslogErrno, 10, 0, 0, 0, 0);
|
||
}
|
||
else
|
||
dostr((char *)sys_errlist[SyslogErrno], 0);
|
||
#endif /* HASSTRERROR */
|
||
break;
|
||
|
||
case '%': dopr_outch( ch ); continue;
|
||
default:
|
||
dostr( "???????" , 0);
|
||
}
|
||
break;
|
||
default:
|
||
dopr_outch( ch );
|
||
break;
|
||
}
|
||
}
|
||
*output = 0;
|
||
}
|
||
|
||
void
|
||
fmtstr( value, ljust, len, zpad, maxwidth )
|
||
char *value;
|
||
int ljust, len, zpad, maxwidth;
|
||
{
|
||
int padlen, strleng; /* amount to pad */
|
||
|
||
if( value == 0 ){
|
||
value = "<NULL>";
|
||
}
|
||
for( strleng = 0; value[strleng]; ++ strleng ); /* strlen */
|
||
if (strleng > maxwidth && maxwidth)
|
||
strleng = maxwidth;
|
||
padlen = len - strleng;
|
||
if( padlen < 0 ) padlen = 0;
|
||
if( ljust ) padlen = -padlen;
|
||
while( padlen > 0 ) {
|
||
dopr_outch( ' ' );
|
||
--padlen;
|
||
}
|
||
dostr( value, maxwidth );
|
||
while( padlen < 0 ) {
|
||
dopr_outch( ' ' );
|
||
++padlen;
|
||
}
|
||
}
|
||
|
||
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;
|
||
}
|
||
}
|
||
|
||
void
|
||
dostr( str , cut)
|
||
char *str;
|
||
int cut;
|
||
{
|
||
if (cut) {
|
||
while(*str && cut-- > 0) dopr_outch(*str++);
|
||
} else {
|
||
while(*str) dopr_outch(*str++);
|
||
}
|
||
}
|
||
|
||
void
|
||
dopr_outch( c )
|
||
int c;
|
||
{
|
||
#if 0
|
||
if( iscntrl(c) && c != '\n' && c != '\t' ){
|
||
c = '@' + (c & 0x1F);
|
||
if( DoprEnd == 0 || output < DoprEnd )
|
||
*output++ = '^';
|
||
}
|
||
#endif /* 0 */
|
||
if( DoprEnd == 0 || output < DoprEnd )
|
||
*output++ = c;
|
||
else
|
||
SnprfOverflow++;
|
||
}
|
||
|
||
/*
|
||
** QUAD_TO_STRING -- Convert a quad type to a string.
|
||
**
|
||
** Convert a quad type to a string. This must be done
|
||
** separately as %lld/%qd are not supported by snprint()
|
||
** and adding support would slow down systems which only
|
||
** emulate the data type.
|
||
**
|
||
** Parameters:
|
||
** value -- number to convert to a string.
|
||
**
|
||
** Returns:
|
||
** pointer to a string.
|
||
*/
|
||
|
||
char *
|
||
quad_to_string(value)
|
||
QUAD_T value;
|
||
{
|
||
char *formatstr;
|
||
static char buf[64];
|
||
|
||
/*
|
||
** Use sprintf() instead of snprintf() since snprintf()
|
||
** does not support %qu or %llu. The buffer is large enough
|
||
** to hold the string so there is no danger of buffer
|
||
** overflow.
|
||
*/
|
||
|
||
#if NEED_PERCENTQ
|
||
formatstr = "%qu";
|
||
#else /* NEED_PERCENTQ */
|
||
formatstr = "%llu";
|
||
#endif /* NEED_PERCENTQ */
|
||
sprintf(buf, formatstr, value);
|
||
return buf;
|
||
}
|
||
/*
|
||
** SHORTENSTRING -- return short version of a string
|
||
**
|
||
** If the string is already short, just return it. If it is too
|
||
** long, return the head and tail of the string.
|
||
**
|
||
** Parameters:
|
||
** s -- the string to shorten.
|
||
** m -- the max length of the string (strlen()).
|
||
**
|
||
** Returns:
|
||
** Either s or a short version of s.
|
||
*/
|
||
|
||
char *
|
||
shortenstring(s, m)
|
||
register const char *s;
|
||
int m;
|
||
{
|
||
int l;
|
||
static char buf[MAXSHORTSTR + 1];
|
||
|
||
l = strlen(s);
|
||
if (l < m)
|
||
return (char *) s;
|
||
if (m > MAXSHORTSTR)
|
||
m = MAXSHORTSTR;
|
||
else if (m < 10)
|
||
{
|
||
if (m < 5)
|
||
{
|
||
(void) strlcpy(buf, s, m + 1);
|
||
return buf;
|
||
}
|
||
(void) strlcpy(buf, s, m - 2);
|
||
(void) strlcat(buf, "...", sizeof buf);
|
||
return buf;
|
||
}
|
||
m = (m - 3) / 2;
|
||
(void) strlcpy(buf, s, m + 1);
|
||
(void) strlcat(buf, "...", sizeof buf);
|
||
(void) strlcat(buf, s + l - m, sizeof buf);
|
||
return buf;
|
||
}
|