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/*
* This file is part of the XForms library package.
*
* XForms is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1, or
* (at your option) any later version.
*
* XForms is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with XForms. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file readint.c
*
* Copyright(c) 1993,1994 by T.C. Zhao
* All rights reserved.
*
* Read an integer (decimal or hex) from a file.
* Valid sepertors are SPACE, \t \n and ,
* Comment is introduced by #
*
* For hex integers, a-f, A-F is assumed continous
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <ctype.h> /* for isdigit */
#include "include/forms.h"
#include "flinternal.h"
#include "ulib.h"
#define IS_FS( c ) \
( ( c ) == ' ' || ( c ) == '\t' || ( c ) == '\n' || ( c ) == ',' )
#define IS_COMMENT( c ) ( ( c ) == '#' )
static int yell = 0;
/***************************************
***************************************/
static void
bad_character( int c )
{
if ( yell && c != EOF )
fprintf(stderr, "Bad character %c Code=%d\n", c, c);
}
/***************************************
***************************************/
static int
skip_comment( FILE * fp )
{
int c;
while ( ( c = getc( fp ) ) != EOF && c != '\n' )
/* empty */ ;
return c != EOF ? getc( fp ) : EOF;
}
/***************************************
* read an integer [+-]nnn. No way to return error status
***************************************/
int
fli_readint( FILE * fp )
{
int c,
num = 0,
sign = 1;
do
{
c = getc( fp );
while ( IS_COMMENT( c ) )
c = skip_comment( fp );
} while ( IS_FS( c ) );
if ( c == '-' || c == '+' )
{
sign = ( c == '-' ) ? -1 : 1;
c = getc( fp );
}
while ( isdigit( ( unsigned char ) c ) )
{
num = 10 * num + c - '0';
c = getc( fp );
}
if ( ! IS_FS( c ) )
{
bad_character( c );
num = 123456;
}
return sign * num;
}
/***************************************
* Read a positive integer. return EOF if error
***************************************/
int
fli_readpint( FILE * fp )
{
int c,
num = 0;
do
{
c = getc( fp );
while ( IS_COMMENT( c ) )
c = skip_comment( fp );
} while ( IS_FS( c ) );
if ( ! ( c == '+' || isdigit( ( unsigned char ) c ) ) )
{
bad_character( c );
return EOF;
}
do
{
num = 10 * num + c - '0';
c = getc( fp );
} while ( isdigit( ( unsigned char ) c ) );
return num;
}
/***************************************
* Read a hex integer
***************************************/
int
fli_readhexint( FILE * fp )
{
int num = 0, i, c;
static short hextab[ 256 ];
/* Initialize the hex table */
if ( ! hextab[ '1' ] )
{
for ( i = '1'; i <= '9'; i++ )
hextab[ i ] = i - '0';
for ( i = 'A'; i <= 'F'; i++ )
hextab[ i ] = 10 + i - 'A';
for ( i = 'a'; i <= 'f'; i++ )
hextab[ i ] = 10 + i - 'a';
}
do
{
c = getc( fp );
while ( IS_COMMENT( c ) )
c = skip_comment( fp );
} while ( IS_FS( c ) );
/* demand 0[xX] */
if ( c != '0' || ( ( c = getc( fp ) ) != 'x' && c != 'X' ) )
{
bad_character( c );
return EOF;
}
/* Now do the coversion */
while ( ( c = getc( fp ) ), isxdigit( ( unsigned char ) c ) )
num = ( num << 4 ) + hextab[ ( unsigned char ) c ];
return num;
}
/*
* Local variables:
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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