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