sane-project-backends/lib/snprintf.c

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#include "../include/sane/config.h"
1999-08-09 18:06:01 +00:00
#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"
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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 */