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sane-project-frontends/lib/snprintf.c

533 wiersze
15 KiB
C
Czysty Wina Historia

#include <../include/sane/config.h>
#ifndef HAVE_SNPRINTF
/***************************************************************************
* LPRng - An Extended Print Spooler System
*
* Copyright 1988-1997, Patrick Powell, San Diego, CA
* papowell@sdsu.edu
* See below for conditions of use.
*
***************************************************************************
* MODULE: snprintf.c
* PURPOSE: LPRng version of printf - absolutely bombproof (hopefully!)
**************************************************************************/
#if 0
The "Artistic License"
Preamble
The intent of this document is to state the conditions under which a
Package may be copied, such that the Copyright Holder maintains some
semblance of artistic control over the development of the package,
while giving the users of the package the right to use and distribute
the Package in a more-or-less customary fashion, plus the right to make
reasonable modifications.
Definitions:
"Package" refers to the collection of files distributed by the
Copyright Holder, and derivatives of that collection of files
created through textual modification.
"Standard Version" refers to such a Package if it has not been
modified, or has been modified in accordance with the wishes
of the Copyright Holder as specified below.
"Copyright Holder" is whoever is named in the copyright or
copyrights for the package.
"You" is you, if you are thinking about copying or distributing
this Package.
"Reasonable copying fee" is whatever you can justify on the
basis of media cost, duplication charges, time of people involved,
and so on. (You will not be required to justify it to the
Copyright Holder, but only to the computing community at large
as a market that must bear the fee.)
"Freely Available" means that no fee is charged for the item
itself, though there may be fees involved in handling the item.
It also means that recipients of the item may redistribute it
under the same conditions they received it.
1. You may make and give away verbatim copies of the source form of the
Standard Version of this Package without restriction, provided that you
duplicate all of the original copyright notices and associated disclaimers.
2. You may apply bug fixes, portability fixes and other modifications
derived from the Public Domain or from the Copyright Holder. A Package
modified in such a way shall still be considered the Standard Version.
3. You may otherwise modify your copy of this Package in any way, provided
that you insert a prominent notice in each changed file stating how and
when you changed that file, and provided that you do at least ONE of the
following:
a) place your modifications in the Public Domain or otherwise make them
Freely Available, such as by posting said modifications to Usenet or
an equivalent medium, or placing the modifications on a major archive
site such as uunet.uu.net, or by allowing the Copyright Holder to include
your modifications in the Standard Version of the Package.
b) use the modified Package only within your corporation or organization.
c) rename any non-standard executables so the names do not conflict
with standard executables, which must also be provided, and provide
a separate manual page for each non-standard executable that clearly
documents how it differs from the Standard Version.
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4. You may distribute the programs of this Package in object code or
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together with instructions (in the manual page or equivalent) on where
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the Package with your modifications.
c) give non-standard executables non-standard names, and clearly
document the differences in manual pages (or equivalent), together
with instructions on where to get the Standard Version.
d) make other distribution arrangements with the Copyright Holder.
5. You may charge a reasonable copying fee for any distribution of this
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Package. You may not charge a fee for this Package itself. However,
you may distribute this Package in aggregate with other (possibly
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6. The name of the Copyright Holder may not be used to endorse or promote
products derived from this software without specific prior written permission.
7. THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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The End
#include "lp.h"
#endif
#include <stdarg.h>
#include <errno.h>
#include <sys/types.h>
#define HAVE_STDARGS /* let's hope that works everywhere (mj) */
#define VA_LOCAL_DECL va_list ap;
#define VA_START(f) va_start(ap, f)
#define VA_SHIFT(v,t) ; /* no-op for ANSI */
#define VA_END va_end(ap)
/**** ENDINCLUDE ****/
static char *const _id = "$Id$";
/*
* dopr(): poor man's version of doprintf
*/
static char * plp_Errormsg ( int err );
static void dopr( char *buffer, const char *format, va_list args );
static void fmtstr( char *value, int ljust, int len, int zpad, int precision );
static void fmtnum( long value, int base, int dosign,
int ljust, int len, int zpad, int precision );
static void fmtdouble( int fmt, double value,
int ljust, int len, int zpad, int precision );
static void dostr( char * );
static char *output;
static void dopr_outch( int c );
static char *end;
int visible_control = 1;
/**************************************************************
* 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...
*
* plp_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.
**************************************************************/
int vsnprintf(char *str, size_t count, const char *fmt, va_list args)
{
str[0] = 0;
end = str+count-1;
dopr( str, fmt, args );
if( count>0 ){
end[0] = 0;
}
return(strlen(str));
}
/* VARARGS3 */
#ifdef HAVE_STDARGS
int snprintf (char *str,size_t count,const char *fmt,...)
#else
int snprintf (va_alist) va_dcl
#endif
{
#ifndef HAVE_STDARGS
char *str;
size_t count;
char *fmt;
#endif
VA_LOCAL_DECL
VA_START (fmt);
VA_SHIFT (str, char *);
VA_SHIFT (count, size_t );
VA_SHIFT (fmt, char *);
(void) vsnprintf ( str, count, fmt, ap);
VA_END;
return( strlen( str ) );
}
static void dopr( char *buffer, const char *format, va_list args )
{
int ch;
long value;
int longflag = 0;
char *strvalue;
int ljust;
int len;
int zpad;
int precision;
int set_precision;
double dval;
int err = errno;
output = buffer;
while( (ch = *format++) ){
switch( ch ){
case '%':
ljust = len = zpad = 0;
precision = -1; set_precision = 0;
nextch:
ch = *format++;
switch( ch ){
case 0:
dostr( "**end of format**" );
return;
case '-': ljust = 1; goto nextch;
case '.': set_precision = 1; precision = 0; goto nextch;
case '*': len = va_arg( args, int ); goto nextch;
case '0': /* set zero padding if len not set */
if(len==0 && set_precision == 0 ) zpad = '0';
case '1': case '2': case '3':
case '4': case '5': case '6':
case '7': case '8': case '9':
if( set_precision ){
precision = precision*10 + ch - '0';
} else {
len = len*10 + ch - '0';
}
goto nextch;
case 'l': longflag = 1; goto nextch;
case 'u': case 'U':
/*fmtnum(value,base,dosign,ljust,len, zpad, precision) */
if( longflag ){
value = va_arg( args, long );
} else {
value = va_arg( args, int );
}
fmtnum( value, 10,0, ljust, len, zpad, precision ); break;
case 'o': case 'O':
/*fmtnum(value,base,dosign,ljust,len, zpad, precision) */
if( longflag ){
value = va_arg( args, long );
} else {
value = va_arg( args, int );
}
fmtnum( value, 8,0, ljust, len, zpad, precision ); 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, precision ); break;
case 'x':
if( longflag ){
value = va_arg( args, long );
} else {
value = va_arg( args, int );
}
fmtnum( value, 16,0, ljust, len, zpad, precision ); break;
case 'X':
if( longflag ){
value = va_arg( args, long );
} else {
value = va_arg( args, int );
}
fmtnum( value,-16,0, ljust, len, zpad, precision ); break;
case 's':
strvalue = va_arg( args, char *);
fmtstr( strvalue,ljust,len, zpad, precision );
break;
case 'c':
ch = va_arg( args, int );
{ char b[2];
int vsb = visible_control;
b[0] = ch;
b[1] = 0;
visible_control = 0;
fmtstr( b,ljust,len, zpad, precision );
visible_control = vsb;
}
break;
case 'f': case 'g':
dval = va_arg( args, double );
fmtdouble( ch, dval,ljust,len, zpad, precision ); break;
case 'm':
fmtstr( plp_Errormsg(err),ljust,len, zpad, precision ); break;
case '%': dopr_outch( ch ); continue;
default:
dostr( "???????" );
}
longflag = 0;
break;
default:
dopr_outch( ch );
break;
}
}
*output = 0;
}
/*
* Format '%[-]len[.precision]s'
* - = left justify (ljust)
* len = minimum length
* precision = numbers of chars in string to use
*/
static void
fmtstr( char *value, int ljust, int len, int zpad, int precision )
{
int padlen, strlen, i, c; /* amount to pad */
if( value == 0 ){
value = "<NULL>";
}
if( precision > 0 ){
strlen = precision;
} else {
/* cheap strlen so you do not have library call */
for( strlen = 0; (c=value[strlen]); ++ strlen ){
if( visible_control && iscntrl( c ) && !isspace( c ) ){
++strlen;
}
}
}
padlen = len - strlen;
if( padlen < 0 ) padlen = 0;
if( ljust ) padlen = -padlen;
while( padlen > 0 ) {
dopr_outch( ' ' );
--padlen;
}
/* output characters */
for( i = 0; (c = value[i]); ++i ){
if( visible_control && iscntrl( c ) && !isspace( c ) ){
dopr_outch('^');
c = ('@' | (c & 0x1F));
}
dopr_outch(c);
}
while( padlen < 0 ) {
dopr_outch( ' ' );
++padlen;
}
}
static void
fmtnum( long value, int base, int dosign, int ljust,
int len, int zpad, int precision )
{
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
fmtdouble( int fmt, double value, int ljust, int len, int zpad, int precision )
{
char convert[128];
char fmtstr[128];
int l;
if( len == 0 ) len = 10;
if( len > sizeof(convert) - 10 ){
len = sizeof(convert) - 10;
}
if( precision > sizeof(convert) - 10 ){
precision = sizeof(convert) - 10;
}
if( precision > len ) precision = len;
strcpy( fmtstr, "%" );
if( ljust ) strcat(fmtstr, "-" );
if( len ){
sprintf( fmtstr+strlen(fmtstr), "%d", len );
}
if( precision > 0 ){
sprintf( fmtstr+strlen(fmtstr), ".%d", precision );
}
l = strlen( fmtstr );
fmtstr[l] = fmt;
fmtstr[l+1] = 0;
sprintf( convert, fmtstr, value );
dostr( convert );
}
static void dostr( char *str )
{
while(*str) dopr_outch(*str++);
}
static void dopr_outch( int c )
{
if( end == 0 || output < end ){
*output++ = c;
}
}
/****************************************************************************
* static char *plp_errormsg( int err )
* returns a printable form of the
* errormessage corresponding to the valie of err.
* This is the poor man's version of sperror(), not available on all systems
* Patrick Powell Tue Apr 11 08:05:05 PDT 1995
****************************************************************************/
/****************************************************************************/
#if !defined(HAVE_STRERROR)
# if defined(HAVE_SYS_NERR)
# if !defined(HAVE_SYS_NERR_DEF)
extern int sys_nerr;
# endif
# define num_errors (sys_nerr)
# else
# define num_errors (-1) /* always use "errno=%d" */
# endif
# if defined(HAVE_SYS_ERRLIST)
# if !defined(HAVE_SYS_ERRLIST_DEF)
extern const char *const sys_errlist[];
# endif
# else
# undef num_errors
# define num_errors (-1) /* always use "errno=%d" */
# endif
#endif
static char * plp_Errormsg ( int err )
{
char *cp;
#if defined(HAVE_STRERROR)
cp = (void *)strerror(err);
#else
# if defined(HAVE_SYS_ERRLIST)
if (err >= 0 && err < num_errors) {
cp = (void *)sys_errlist[err];
} else
# endif
{
static char msgbuf[32]; /* holds "errno=%d". */
/* SAFE use of sprintf */
(void) sprintf (msgbuf, "errno=%d", err);
cp = msgbuf;
}
#endif
return (cp);
}
#if defined(TEST)
#include <stdio.h>
int main( void )
{
char buffer[128];
char *t;
char *test1 = "01234";
errno = 1;
plp_snprintf( buffer, sizeof(buffer), (t="errno '%m'")); printf( "%s = '%s'\n", t, buffer );
plp_snprintf( buffer, sizeof(buffer), (t = "%s"), test1 ); printf( "%s = '%s'\n", t, buffer );
plp_snprintf( buffer, sizeof(buffer), (t = "%12s"), test1 ); printf( "%s = '%s'\n", t, buffer );
plp_snprintf( buffer, sizeof(buffer), (t = "%-12s"), test1 ); printf( "%s = '%s'\n", t, buffer );
plp_snprintf( buffer, sizeof(buffer), (t = "%12.2s"), test1 ); printf( "%s = '%s'\n", t, buffer );
plp_snprintf( buffer, sizeof(buffer), (t = "%-12.2s"), test1 ); printf( "%s = '%s'\n", t, buffer );
plp_snprintf( buffer, sizeof(buffer), (t = "%g"), 1.25 ); printf( "%s = '%s'\n", t, buffer );
plp_snprintf( buffer, sizeof(buffer), (t = "%g"), 1.2345 ); printf( "%s = '%s'\n", t, buffer );
plp_snprintf( buffer, sizeof(buffer), (t = "%12g"), 1.25 ); printf( "%s = '%s'\n", t, buffer );
plp_snprintf( buffer, sizeof(buffer), (t = "%12.2g"), 1.25 ); printf( "%s = '%s'\n", t, buffer );
plp_snprintf( buffer, sizeof(buffer), (t = "%0*d"), 6, 1 ); printf( "%s = '%s'\n", t, buffer );
return(0);
}
#endif
#endif /* HAVE_SNPRINTF */
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