353 lines
8.2 KiB
C
353 lines
8.2 KiB
C
/***************************************************************************
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* LPRng - An Extended Print Spooler System
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*
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* Copyright 1988-1995 Patrick Powell, San Diego State University
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* papowell@sdsu.edu
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* See LICENSE for conditions of use.
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*
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***************************************************************************
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* MODULE: snprintf.c
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* PURPOSE: LPRng version of printf - absolutely bombproof (hopefully!)
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**************************************************************************/
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/*
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*
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*
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* Removed the 'plp' from function names and may have made other
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* modifications so if it looks mangled its my fault.
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*
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* -john
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*
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*
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*/
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#include <stdio.h>
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#ifdef HAVE_STDARG_H
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#include <stdarg.h>
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#define HAVE_STDARGS /* let's hope that works everywhere (mj) */
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#define VA_LOCAL_DECL va_list ap;
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#define VA_START(f) va_start(ap, f)
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#define VA_SHIFT(v,t) ; /* no-op for ANSI */
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#define VA_END va_end(ap)
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#else
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#ifdef HAVE_VARARGS_H
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#include <varargs.h>
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#undef HAVE_STDARGS
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#define VA_LOCAL_DECL va_list ap;
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#define VA_START(f) va_start(ap) /* f is ignored! */
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#define VA_SHIFT(v,t) v = va_arg(ap,t)
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#define VA_END va_end(ap)
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#else
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XX ** NO VARARGS ** XX
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#endif
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "port_after.h"
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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 dopr( char *buffer, const char *format, va_list args );
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static void fmtstr( char *value, int ljust, int len, int zpad, int precision );
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static void fmtnum( long value, int base, int dosign,
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int ljust, int len, int zpad, int precision );
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static void fmtdouble( int fmt, double value,
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int ljust, int len, int zpad, int precision );
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static void dostr( char * );
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static char *output;
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static void dopr_outch( int c );
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static char *end;
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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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* plp_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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int vsnprintf(char *str, size_t count, const char *fmt, 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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dopr( str, fmt, args );
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if( count>0 ){
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end[0] = 0;
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}
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return(strlen(str));
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}
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/* VARARGS3 */
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#ifdef HAVE_STDARGS
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int snprintf (char *str,size_t count,const char *fmt,...)
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#else
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int snprintf (va_alist) va_dcl
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#endif
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{
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#ifndef HAVE_STDARGS
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char *str;
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size_t count;
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char *fmt;
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#endif
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VA_LOCAL_DECL
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VA_START (fmt);
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VA_SHIFT (str, char *);
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VA_SHIFT (count, size_t );
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VA_SHIFT (fmt, char *);
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(void) vsnprintf ( str, count, fmt, ap);
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VA_END;
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return( strlen( str ) );
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}
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static void dopr( char *buffer, const char *format, 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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char *strvalue;
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int ljust;
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int len;
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int zpad;
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int precision;
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int set_precision;
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double dval;
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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 = 0;
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precision = -1; set_precision = 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**" );
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return;
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case '-': ljust = 1; goto nextch;
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case '.': set_precision = 1; precision = 0; goto nextch;
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case '*': len = va_arg( args, int ); goto nextch;
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case '0': /* set zero padding if len not set */
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if(len==0 && set_precision == 0 ) 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( set_precision ){
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precision = precision*10 + ch - '0';
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} else {
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len = len*10 + ch - '0';
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}
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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, precision) */
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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, precision ); break;
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case 'o': case 'O':
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/*fmtnum(value,base,dosign,ljust,len, zpad, precision) */
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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, precision ); 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, precision ); 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, precision ); 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, precision ); break;
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case 's':
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strvalue = va_arg( args, char *);
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fmtstr( strvalue,ljust,len, zpad, precision ); break;
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case 'c':
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ch = va_arg( args, int );
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{ char b[2];
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b[0] = ch;
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b[1] = 0;
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fmtstr( b,ljust,len, zpad, precision ); break;
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}
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break;
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case 'f': case 'g':
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dval = va_arg( args, double );
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fmtdouble( ch, dval,ljust,len, zpad, precision ); break;
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case '%': dopr_outch( ch ); continue;
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default:
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dostr( "???????" );
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}
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longflag = 0;
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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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/*
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* Format '%[-]len[.precision]s'
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* - = left justify (ljust)
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* len = minimum length
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* precision = numbers of chars in string to use
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*/
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static void
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fmtstr( char *value, int ljust, int len, int zpad, int precision )
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{
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int padlen, strlen, i; /* amount to pad */
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if( value == 0 ){
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value = "<NULL>";
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}
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if( precision > 0 ){
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strlen = precision;
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} else {
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for( strlen = 0; value[strlen]; ++ strlen ); /* strlen */
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}
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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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/* output characters */
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for( i = 0; i < strlen; ++i ) dopr_outch(value[i]);
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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( long value, int base, int dosign, int ljust,
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int len, int zpad, int precision )
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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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fmtdouble( int fmt, double value, int ljust, int len, int zpad, int precision )
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{
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char convert[128];
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char fmtstr[128];
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int l;
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if( len == 0 ) len = 10;
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if( len > sizeof(convert) - 10 ){
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len = sizeof(convert) - 10;
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}
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if( precision > sizeof(convert) - 10 ){
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precision = sizeof(convert) - 10;
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}
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if( precision > len ) precision = len;
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strcpy( fmtstr, "%" );
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if( ljust ) strcat(fmtstr, "-" );
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if( len ){
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sprintf( fmtstr+strlen(fmtstr), "%d", len );
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}
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if( precision > 0 ){
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sprintf( fmtstr+strlen(fmtstr), ".%d", precision );
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}
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l = strlen( fmtstr );
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fmtstr[l] = fmt;
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fmtstr[l+1] = 0;
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sprintf( convert, fmtstr, value );
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dostr( convert );
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}
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static void dostr( char *str )
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{
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while(*str) dopr_outch(*str++);
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}
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static void dopr_outch( int c )
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{
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if( end == 0 || output < end ){
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*output++ = c;
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}
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}
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