|
- /***************************************************************
-
- bwb_inp.c Input Routines
- for Bywater BASIC Interpreter
-
- Commands: DATA
- READ
- RESTORE
- INPUT
- LINE INPUT
-
- Copyright (c) 1993, Ted A. Campbell
- Bywater Software
-
- email: tcamp@delphi.com
-
- Copyright and Permissions Information:
-
- All U.S. and international rights are claimed by the author,
- Ted A. Campbell.
-
- This software is released under the terms of the GNU General
- Public License (GPL), which is distributed with this software
- in the file "COPYING". The GPL specifies the terms under
- which users may copy and use the software in this distribution.
-
- A separate license is available for commercial distribution,
- for information on which you should contact the author.
-
- ***************************************************************/
-
- /*---------------------------------------------------------------*/
- /* NOTE: Modifications marked "JBV" were made by Jon B. Volkoff, */
- /* 11/1995 (eidetics@cerf.net). */
- /*---------------------------------------------------------------*/
-
- #include <stdio.h>
- #include <ctype.h>
- #include <math.h>
-
- #include "bwbasic.h"
- #include "bwb_mes.h"
-
- /* Declarations of functions visible to this file only */
-
- #if ANSI_C
- static struct bwb_line *bwb_xinp( struct bwb_line *l, FILE *f );
- static struct bwb_line *inp_str( struct bwb_line *l, char *buffer,
- char *var_list, int *position );
- static int inp_const( char *m_buffer, char *s_buffer, int *position );
- static int inp_assign( char *b, struct bwb_variable *v );
- static int inp_advws( FILE *f );
- static int inp_xgetc( FILE *f, int is_string );
- static int inp_eatcomma( FILE *f );
- static bnumber inp_numconst( char *expression ); /* JBV */
- #else
- static struct bwb_line *bwb_xinp();
- static struct bwb_line *inp_str();
- static int inp_const();
- static int inp_assign();
- static int inp_advws();
- static int inp_xgetc();
- static int inp_eatcomma();
- static bnumber inp_numconst(); /* JBV */
- #endif
-
- static char_saved = FALSE;
- static cs;
- static int last_inp_adv_rval = FALSE; /* JBV */
-
- /***************************************************************
-
- FUNCTION: bwb_read()
-
- DESCRIPTION: This function implements the BASIC READ
- statement.
-
- SYNTAX: READ variable[, variable...]
-
- ***************************************************************/
-
- #if ANSI_C
- struct bwb_line *
- bwb_read( struct bwb_line *l )
- #else
- struct bwb_line *
- bwb_read( l )
- struct bwb_line *l;
- #endif
- {
- int pos;
- register int n;
- int main_loop, adv_loop;
- struct bwb_variable *v;
- int n_params; /* number of parameters */
- int *pp; /* pointer to parameter values */
- char tbuf[ MAXSTRINGSIZE + 1 ];
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_read(): buffer <%s>",
- &( l->buffer[ l->position ]));
- bwb_debug( bwb_ebuf );
- #endif
-
- /* Process each variable read from the READ statement */
-
- main_loop = TRUE;
- while ( main_loop == TRUE )
- {
-
- /* first check position in l->buffer and advance beyond whitespace */
-
- adv_loop = TRUE;
- while( adv_loop == TRUE )
- {
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_read() adv_loop char <%d> = <%c>",
- l->buffer[ l->position ], l->buffer[ l->position ] );
- bwb_debug( bwb_ebuf );
- #endif
-
- switch ( l->buffer[ l->position ] )
- {
- case ',': /* comma delimiter */
- case ' ': /* whitespace */
- case '\t':
- ++l->position;
- break;
- case ':': /* end of line segment */
- case '\n': /* end of line */
- case '\r':
- case '\0':
- adv_loop = FALSE; /* break out of advance loop */
- main_loop = FALSE; /* break out of main loop */
- break;
- default: /* anything else */
- adv_loop = FALSE; /* break out of advance loop */
- break;
- }
- }
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_read(): end of adv_loop <%d> main_loop <%d>",
- adv_loop, main_loop );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* be sure main_loop id still valid after checking the line */
-
- if ( main_loop == TRUE )
- {
-
- /* Read a variable name */
-
- bwb_getvarname( l->buffer, tbuf, &( l->position ) );
- inp_adv( l->buffer, &( l->position ) );
- v = var_find( tbuf );
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_read(): line <%d> variable <%s>",
- l->number, v->name );
- bwb_debug( bwb_ebuf );
- sprintf( bwb_ebuf, "in bwb_read(): remaining line <%s>",
- &( l->buffer[ l->position ] ) );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* advance beyond whitespace or comma in data buffer */
-
- inp_adv( CURTASK data_line->buffer, &CURTASK data_pos );
-
- /* Advance to next line if end of buffer */
-
- switch( CURTASK data_line->buffer[ CURTASK data_pos ] )
- {
- case '\0': /* end of buffer */
- case '\n':
- case '\r':
-
- CURTASK data_line = CURTASK data_line->next;
-
- /* advance farther to line with DATA statement if necessary */
-
- pos = 0;
- line_start( CURTASK data_line->buffer, &pos,
- &( CURTASK data_line->lnpos ),
- &( CURTASK data_line->lnum ),
- &( CURTASK data_line->cmdpos ),
- &( CURTASK data_line->cmdnum ),
- &( CURTASK data_line->startpos ) );
- CURTASK data_pos = CURTASK data_line->startpos;
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_read(): current data line: <%s>",
- CURTASK data_line->buffer );
- bwb_debug( bwb_ebuf );
- #endif
-
- break;
- }
-
- while ( bwb_cmdtable[ CURTASK data_line->cmdnum ].vector != bwb_data )
- {
-
- if ( CURTASK data_line == &CURTASK bwb_end )
- {
- CURTASK data_line = CURTASK bwb_start.next;
- }
-
- else
- {
- CURTASK data_line = CURTASK data_line->next;
- }
-
- pos = 0;
- line_start( CURTASK data_line->buffer, &pos,
- &( CURTASK data_line->lnpos ),
- &( CURTASK data_line->lnum ),
- &( CURTASK data_line->cmdpos ),
- &( CURTASK data_line->cmdnum ),
- &( CURTASK data_line->startpos ) );
- CURTASK data_pos = CURTASK data_line->startpos;
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_read(): advance to data line: <%s>",
- CURTASK data_line->buffer );
- bwb_debug( bwb_ebuf );
- #endif
-
- }
-
- /* advance beyond whitespace in data buffer */
-
- adv_loop = TRUE;
- while ( adv_loop == TRUE )
- {
- switch( CURTASK data_line->buffer[ CURTASK data_pos ] )
- {
- case '\0': /* end of buffer */
- case '\n':
- case '\r':
- bwb_error( err_od );
- return bwb_zline( l );
- case ' ': /* whitespace */
- case '\t':
- ++CURTASK data_pos;
- break;
- default:
- adv_loop = FALSE; /* carry on */
- break;
- }
- }
-
- /* now at last we have a variable in v that needs to be
- assigned data from the data_buffer at position CURTASK data_pos.
- What remains to be done is to get one single bit of data,
- a string constant or numerical constant, into the small
- buffer */
-
- inp_const( CURTASK data_line->buffer, tbuf, &CURTASK data_pos );
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_read(): data constant is <%s>", tbuf );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* get parameters if the variable is dimensioned */
-
- adv_ws( l->buffer, &( l->position ) );
- if ( l->buffer[ l->position ] == '(' )
- {
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_read(): variable <%s> is dimensioned",
- v->name );
- bwb_debug( bwb_ebuf );
- #endif
- dim_getparams( l->buffer, &( l->position ), &n_params, &pp );
- for ( n = 0; n < v->dimensions; ++n )
- {
- v->array_pos[ n ] = pp[ n ];
- }
- }
- #if INTENSIVE_DEBUG
- else
- {
- sprintf( bwb_ebuf, "in bwb_read(): variable <%s> is NOT dimensioned",
- v->name );
- bwb_debug( bwb_ebuf );
- sprintf( bwb_ebuf, "in bwb_read(): remaining line <%s>",
- &( l->buffer[ l->position ] ) );
- bwb_debug( bwb_ebuf );
- }
- #endif
-
- /* finally assign the data to the variable */
-
- inp_assign( tbuf, v );
-
- } /* end of remainder of main loop */
-
- } /* end of main_loop */
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_read(): exiting function, line <%s> ",
- &( l->buffer[ l->position ] ) );
- bwb_debug( bwb_ebuf );
- #endif
-
- return bwb_zline( l );
-
- }
-
- /***************************************************************
-
- FUNCTION: bwb_data()
-
- DESCRIPTION: This function implements the BASIC DATA
- statement, although at the point at which
- DATA statements are encountered, no
- processing is done. All actual processing
- of DATA statements is accomplished by READ
- (bwb_read()).
-
- SYNTAX: DATA constant[, constant]...
-
- ***************************************************************/
-
- #if ANSI_C
- struct bwb_line *
- bwb_data( struct bwb_line *l )
- #else
- struct bwb_line *
- bwb_data( l )
- struct bwb_line *l;
- #endif
- {
-
- #if MULTISEG_LINES
- adv_eos( l->buffer, &( l->position ));
- #endif
-
- return bwb_zline( l );
- }
-
- /***************************************************************
-
- FUNCTION: bwb_restore()
-
- DESCRIPTION: This function implements the BASIC RESTORE
- statement.
-
- SYNTAX: RESTORE [line number]
-
- ***************************************************************/
-
- #if ANSI_C
- struct bwb_line *
- bwb_restore( struct bwb_line *l )
- #else
- struct bwb_line *
- bwb_restore( l )
- struct bwb_line *l;
- #endif
- {
- struct bwb_line *r;
- struct bwb_line *r_line;
- int n;
- int pos;
- char tbuf[ MAXSTRINGSIZE + 1 ];
-
- /* get the first element beyond the starting position */
-
- adv_element( l->buffer, &( l->position ), tbuf );
-
- /* if the line is not a numerical constant, then there is no
- argument; set the current line to the first in the program */
-
- if ( is_numconst( tbuf ) != TRUE )
- {
- CURTASK data_line = &CURTASK bwb_start;
- CURTASK data_pos = 0;
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_restore(): RESTORE w/ no argument " );
- bwb_debug( bwb_ebuf );
- #endif
- return bwb_zline( l );
- }
-
- /* find the line */
-
- n = atoi( tbuf );
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_restore(): line for restore is <%d>", n );
- bwb_debug( bwb_ebuf );
- #endif
-
- r_line = NULL;
- for ( r = CURTASK bwb_start.next; r != &CURTASK bwb_end; r = r->next )
- {
-
- if ( r->number == n )
- {
- r_line = r;
- }
- }
-
- if ( r_line == NULL )
- {
- #if PROG_ERRORS
- sprintf( bwb_ebuf, "at line %d: Can't find line number for RESTORE.",
- l->number );
- bwb_error( bwb_ebuf );
- #else
- sprintf( bwb_ebuf, err_lnnotfound, n );
- bwb_error( bwb_ebuf );
- #endif
- return bwb_zline( l );
- }
-
- /* initialize variables for the line */
-
- pos = 0;
- line_start( r_line->buffer, &pos,
- &( r_line->lnpos ),
- &( r_line->lnum ),
- &( r_line->cmdpos ),
- &( r_line->cmdnum ),
- &( r_line->startpos ) );
-
- /* verify that line is a data statement */
-
- if ( bwb_cmdtable[ r_line->cmdnum ].vector != bwb_data )
- {
- #if PROG_ERRORS
- sprintf( bwb_ebuf, "at line %d: Line %d is not a DATA statement.",
- l->number, r_line->number );
- bwb_error( bwb_ebuf );
- #else
- bwb_error( err_syntax );
- #endif
- return bwb_zline( l );
- }
-
- /* reassign CURTASK data_line */
-
- CURTASK data_line = r_line;
- CURTASK data_pos = CURTASK data_line->startpos;
-
- return bwb_zline( l );
- }
-
- /***************************************************************
-
- FUNCTION: bwb_input()
-
- DESCRIPTION: This function implements the BASIC INPUT
- statement.
-
- SYNTAX: INPUT [;][prompt$;]variable[$,variable]...
- INPUT#n variable[$,variable]...
-
- ***************************************************************/
-
- #if ANSI_C
- struct bwb_line *
- bwb_input( struct bwb_line *l )
- #else
- struct bwb_line *
- bwb_input( l )
- struct bwb_line *l;
- #endif
- {
- FILE *fp;
- int pos;
- int req_devnumber;
- struct exp_ese *v;
- int is_prompt;
- int suppress_qm;
- static char tbuf[ MAXSTRINGSIZE + 1 ];
- static char pstring[ MAXSTRINGSIZE + 1 ];
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_input(): enter function" );
- bwb_debug( bwb_ebuf );
- #endif
-
- pstring[ 0 ] = '\0';
-
- #if COMMON_CMDS
-
- /* advance beyond whitespace and check for the '#' sign */
-
- adv_ws( l->buffer, &( l->position ) );
-
- if ( l->buffer[ l->position ] == '#' )
- {
- ++( l->position );
- adv_element( l->buffer, &( l->position ), tbuf );
- pos = 0;
- v = bwb_exp( tbuf, FALSE, &pos );
- adv_ws( l->buffer, &( l->position ) );
- if ( l->buffer[ l->position ] == ',' )
- {
- ++( l->position );
- }
- else
- {
- #if PROG_ERRORS
- bwb_error( "in bwb_input(): no comma after#n" );
- #else
- bwb_error( err_syntax );
- #endif
- return bwb_zline( l );
- }
-
- req_devnumber = (int) exp_getnval( v );
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_input(): requested device number <%d>",
- req_devnumber );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* check the requested device number */
-
- if ( ( req_devnumber < 0 ) || ( req_devnumber >= DEF_DEVICES ))
- {
- #if PROG_ERRORS
- bwb_error( "in bwb_input(): Requested device number is out if range." );
- #else
- bwb_error( err_devnum );
- #endif
- return bwb_zline( l );
- }
-
- if ( ( dev_table[ req_devnumber ].mode == DEVMODE_CLOSED ) ||
- ( dev_table[ req_devnumber ].mode == DEVMODE_AVAILABLE ) )
- {
- #if PROG_ERRORS
- bwb_error( "in bwb_input(): Requested device number is not open." );
- #else
- bwb_error( err_devnum );
- #endif
-
- return bwb_zline( l );
- }
-
- if ( dev_table[ req_devnumber ].mode != DEVMODE_INPUT )
- {
- #if PROG_ERRORS
- bwb_error( "in bwb_input(): Requested device is not open for INPUT." );
- #else
- bwb_error( err_devnum );
- #endif
-
- return bwb_zline( l );
- }
-
- /* look up the requested device in the device table */
-
- fp = dev_table[ req_devnumber ].cfp;
-
- }
- else
- {
- fp = stdin;
- }
-
- #else
- fp = stdin;
- #endif /* COMMON_CMDS */
-
- /* if input is not from stdin, then branch to bwb_xinp() */
-
- if ( fp != stdin )
- {
- return bwb_xinp( l, fp );
- }
-
- /* from this point we presume that input is from stdin */
-
- /* check for a semicolon or a quotation mark, not in
- first position: this should indicate a prompt string */
-
- suppress_qm = is_prompt = FALSE;
-
- adv_ws( l->buffer, &( l->position ) );
-
- switch( l->buffer[ l->position ] )
- {
- case '\"':
- is_prompt = TRUE;
- break;
-
- case ';':
-
- /* AGENDA: add code to suppress newline if a
- semicolon is used here; this may not be possible
- using ANSI C alone, since it has not functions for
- unechoed console input. */
-
- is_prompt = TRUE;
- ++l->position;
- break;
-
- case ',':
-
- /* QUERY: why is this code here? the question mark should
- be suppressed if a comma <follows> the prompt string. */
-
- #if INTENSIVE_DEBUG
- bwb_debug( "in bwb_input(): found initial comma" );
- #endif
- suppress_qm = TRUE;
- ++l->position;
- break;
- }
-
- /* get prompt string and print it */
-
- if ( is_prompt == TRUE )
- {
-
- /* get string element */
-
- inp_const( l->buffer, tbuf, &( l->position ) );
-
- /* advance past semicolon to beginning of variable */
-
- /*--------------------------------------------------------*/
- /* Since inp_const was just called and inp_adv is called */
- /* within that, it will have already noted and passed the */
- /* comma by the time it gets here. Therefore one must */
- /* refer instead to the last returned value for inp_adv! */
- /* (JBV, 10/95) */
- /*--------------------------------------------------------*/
- /* suppress_qm = inp_adv( l->buffer, &( l->position ) ); */
- suppress_qm = last_inp_adv_rval;
-
- /* print the prompt string */
-
- strncpy( pstring, tbuf, MAXSTRINGSIZE );
- } /* end condition: prompt string */
-
- /* print out the question mark delimiter unless it has been
- suppressed */
-
- if ( suppress_qm != TRUE )
- {
- strncat( pstring, "? ", MAXSTRINGSIZE );
- }
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_input(): ready to get input line" );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* read a line into the input buffer */
-
- bwx_input( pstring, tbuf );
- bwb_stripcr( tbuf );
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_input(): received line <%s>", tbuf );
- bwb_debug( bwb_ebuf );
- bwb_debug( "Press RETURN: " );
- getchar();
- #endif
-
- /* reset print column to account for LF at end of fgets() */
-
- * prn_getcol( stdout ) = 1;
-
- return inp_str( l, tbuf, l->buffer, &( l->position ) );
-
- }
-
- /***************************************************************
-
- FUNCTION: bwb_xinp()
-
- DESCRIPTION: This function does the bulk of processing
- for INPUT#, and so is file independent.
-
- ***************************************************************/
-
- #if ANSI_C
- static struct bwb_line *
- bwb_xinp( struct bwb_line *l, FILE *f )
- #else
- static struct bwb_line *
- bwb_xinp( l, f )
- struct bwb_line *l;
- FILE *f;
- #endif
- {
- int loop;
- struct bwb_variable *v;
- char c;
- register int n;
- int *pp;
- int n_params;
- char tbuf[ MAXSTRINGSIZE + 1 ];
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_xinp(): buffer <%s>",
- &( l->buffer[ l->position ] ) );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* loop through elements required */
-
- loop = TRUE;
- while ( loop == TRUE )
- {
-
- /* read a variable from the list */
-
- bwb_getvarname( l->buffer, tbuf, &( l->position ) );
- v = var_find( tbuf );
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_xinp(): found variable name <%s>",
- v->name );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* read subscripts */
-
- adv_ws( l->buffer, &( l->position ) );
- if ( l->buffer[ l->position ] == '(' )
- {
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_xinp(): variable <%s> has dimensions",
- v->name );
- bwb_debug( bwb_ebuf );
- #endif
- dim_getparams( l->buffer, &( l->position ), &n_params, &pp );
- for ( n = 0; n < v->dimensions; ++n )
- {
- v->array_pos[ n ] = pp[ n ];
- }
- }
-
- inp_advws( f );
-
- /* perform type-specific input */
-
- switch( v->type )
- {
- case STRING:
- if ( inp_xgetc( f, TRUE ) != '\"' )
- {
- #if PROG_ERRORS
- sprintf( bwb_ebuf, "in bwb_xinp(): expected quotation mark" );
- bwb_error( bwb_ebuf );
- #else
- bwb_error( err_mismatch );
- #endif
- }
- n = 0;
- while ( ( c = (char) inp_xgetc( f, TRUE )) != '\"' )
- {
- tbuf[ n ] = c;
- ++n;
- tbuf[ n ] = '\0';
- }
- str_ctob( var_findsval( v, v->array_pos ), tbuf );
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_xinp(): read STRING <%s>",
- tbuf );
- bwb_debug( bwb_ebuf );
- #endif
- inp_eatcomma( f );
- break;
- default:
- n = 0;
- while ( ( c = (char) inp_xgetc( f, FALSE )) != ',' )
- {
- tbuf[ n ] = c;
- ++n;
- tbuf[ n ] = '\0';
- }
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_xinp(): read NUMBER <%s>",
- tbuf );
- bwb_debug( bwb_ebuf );
- #endif
- /*------------------------------------------------------------*/
- /* atof call replaced by inp_numconst, gets all input formats */
- /* (JBV, 10/95) */
- /*------------------------------------------------------------*/
- /* * var_findnval( v, v->array_pos ) = (bnumber) atof( tbuf ); */
- * var_findnval( v, v->array_pos ) = inp_numconst( tbuf );
- break;
- } /* end of switch for type-specific input */
-
- /* check for comma */
-
- adv_ws( l->buffer, &( l->position ) );
- if ( l->buffer[ l->position ] == ',' )
- {
- ++( l->position );
- }
- else
- {
- loop = FALSE;
- }
-
- }
-
- /* return */
-
- return bwb_zline( l );
-
- }
-
- /***************************************************************
-
- FUNCTION: inp_advws()
-
- DESCRIPTION: This C function advances past whitespace
- input from a particular file or device.
-
- ***************************************************************/
-
- #if ANSI_C
- static int
- inp_advws( FILE *f )
- #else
- static int
- inp_advws( f )
- FILE *f;
- #endif
- {
- register int c;
- int loop;
-
- loop = TRUE;
- while ( loop == TRUE )
- {
- c = (char) inp_xgetc( f, TRUE );
-
- switch( c )
- {
- case '\n':
- case '\r':
- case ' ':
- case '\t':
- break;
- default:
- char_saved = TRUE;
- cs = c;
- loop = FALSE;
- break;
- }
- }
-
- return TRUE;
- }
-
- /***************************************************************
-
- FUNCTION: inp_xgetc()
-
- DESCRIPTION: This C function reads in a character from
- a specified file or device.
-
- ***************************************************************/
-
- #if ANSI_C
- static int
- inp_xgetc( FILE *f, int is_string )
- #else
- static int
- inp_xgetc( f, is_string )
- FILE *f;
- int is_string;
- #endif
- {
- register int c;
- static int prev_eof = FALSE;
-
- if ( char_saved == TRUE )
- {
- char_saved = FALSE;
- return cs;
- }
-
- if ( feof( f ) != 0 )
- {
- if ( prev_eof == TRUE )
- {
- bwb_error( err_od );
- }
- else
- {
- prev_eof = TRUE;
- return (int) ',';
- }
- }
-
- prev_eof = FALSE;
-
- c = fgetc( f );
-
- if ( is_string == TRUE )
- {
- return c;
- }
-
- switch( c )
- {
- case ' ':
- case '\n':
- case ',':
- case '\r':
- return ',';
- }
-
- return c;
-
- }
-
- /***************************************************************
-
- FUNCTION: inp_eatcomma()
-
- DESCRIPTION: This C function advances beyond a comma
- input from a specified file or device.
-
- ***************************************************************/
-
- #if ANSI_C
- static int
- inp_eatcomma( FILE *f )
- #else
- static int
- inp_eatcomma( f )
- FILE *f;
- #endif
- {
- char c;
-
- while ( ( c = (char) inp_xgetc( f, TRUE ) ) == ',' )
- {
- }
-
- char_saved = TRUE;
- cs = c;
-
- return TRUE;
- }
-
- /***************************************************************
-
- FUNCTION: inp_str()
-
- DESCRIPTION: This function does INPUT processing
- from a determined string of input
- data and a determined variable list
- (both in memory). This presupposes
- that input has been taken from stdin,
- not from a disk file or device.
-
- ***************************************************************/
-
- #if ANSI_C
- static struct bwb_line *
- inp_str( struct bwb_line *l, char *input_buffer, char *var_list, int *vl_position )
- #else
- static struct bwb_line *
- inp_str( l, input_buffer, var_list, vl_position )
- struct bwb_line *l;
- char *input_buffer;
- char *var_list;
- int *vl_position;
- #endif
- {
- int i;
- register int n;
- struct bwb_variable *v;
- int loop;
- int *pp;
- int n_params;
- char ttbuf[ MAXSTRINGSIZE + 1 ]; /* build element */
- char varname[ MAXSTRINGSIZE + 1 ]; /* build element */
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_str(): received line <%s>",
- l->buffer );
- bwb_debug( bwb_ebuf );
- sprintf( bwb_ebuf, "in inp_str(): received variable list <%s>.",
- &( var_list[ *vl_position ] ) );
- bwb_debug( bwb_ebuf );
- sprintf( bwb_ebuf, "in inp_str(): received input buffer <%s>.",
- input_buffer );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* Read elements, and assign them to variables */
-
- i = 0;
- loop = TRUE;
- while ( loop == TRUE )
- {
-
- /* get a variable name from the list */
-
- bwb_getvarname( var_list, varname, vl_position ); /* get name */
- v = var_find( varname );
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_str(): found variable buffer <%s> name <%s>",
- varname, v->name );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* read subscripts if appropriate */
-
- adv_ws( var_list, vl_position );
- if ( var_list[ *vl_position ] == '(' )
- {
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_str(): variable <%s> has dimensions",
- v->name );
- bwb_debug( bwb_ebuf );
- #endif
- dim_getparams( var_list, vl_position, &n_params, &pp );
- for ( n = 0; n < v->dimensions; ++n )
- {
- v->array_pos[ n ] = pp[ n ];
- }
- }
-
- /* build string from input buffer in ttbuf */
-
- n = 0;
- ttbuf[ 0 ] = '\0';
- while ( ( input_buffer[ i ] != ',' )
- && ( input_buffer[ i ] != '\0' ))
- {
- ttbuf[ n ] = input_buffer[ i ];
- ++n;
- ++i;
- ttbuf[ n ] = '\0';
- }
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_str(): string for input <%s>",
- ttbuf );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* perform type-specific input */
-
- inp_assign( ttbuf, v );
-
- /* check for commas in variable list and input list and advance */
-
- adv_ws( var_list, vl_position );
- switch( var_list[ *vl_position ] )
- {
- case '\n':
- case '\r':
- case '\0':
- case ':':
- loop = FALSE;
- break;
- case ',':
- ++( *vl_position );
- break;
- }
- adv_ws( var_list, vl_position );
-
- adv_ws( input_buffer, &i );
- switch ( input_buffer[ i ] )
- {
- case '\n':
- case '\r':
- case '\0':
- case ':':
- loop = FALSE;
- break;
- case ',':
- ++i;
- break;
- }
- adv_ws( input_buffer, &i );
-
- }
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_str(): exit, line buffer <%s>",
- &( l->buffer[ l->position ] ) );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* return */
-
- return bwb_zline( l );
-
- }
-
- /***************************************************************
-
- FUNCTION: inp_assign()
-
- DESCRIPTION: This function assigns the value of a
- numerical or string constant to a
- variable.
-
-
- ***************************************************************/
-
- #if ANSI_C
- static int
- inp_assign( char *b, struct bwb_variable *v )
- #else
- static int
- inp_assign( b, v )
- char *b;
- struct bwb_variable *v;
- #endif
- {
-
- switch( v->type )
- {
- case STRING:
- str_ctob( var_findsval( v, v->array_pos ), b );
- break;
-
- case NUMBER:
- if ( strlen( b ) == 0 )
- {
- *( var_findnval( v, v->array_pos )) = (bnumber) 0.0;
- }
- else
- {
- /*------------------------------------------------------------*/
- /* atof call replaced by inp_numconst, gets all input formats */
- /* (JBV, 10/95) */
- /*------------------------------------------------------------*/
- /* *( var_findnval( v, v->array_pos )) = (bnumber) atof( b ); */
- *( var_findnval( v, v->array_pos )) = inp_numconst( b );
- }
- break;
-
- default:
- #if PROG_ERRORS
- sprintf( bwb_ebuf, "in inp_assign(): variable <%s> of unknown type",
- v->name );
- bwb_error( bwb_ebuf );
- #else
- bwb_error( err_mismatch );
- #endif
- return FALSE;
-
- }
-
- return FALSE;
-
- }
-
- /***************************************************************
-
- FUNCTION: inp_adv()
-
- DESCRIPTION: This function advances the string pointer
- past whitespace and the item delimiter
- (comma).
-
- ***************************************************************/
-
- #if ANSI_C
- int
- inp_adv( char *b, int *c )
- #else
- int
- inp_adv( b, c )
- char *b;
- int *c;
- #endif
- {
- int rval;
-
- rval = FALSE;
-
- while( TRUE )
- {
- switch( b[ *c ] )
- {
- case ' ': /* whitespace */
- case '\t':
- case ';': /* semicolon, end of prompt string */
- ++*c;
- break;
- case ',': /* comma, variable delimiter */
- rval = TRUE;
- ++*c;
- break;
- case '\0': /* end of line */
- case ':': /* end of line segment */
- rval = TRUE;
- last_inp_adv_rval = rval; /* JBV */
- return rval;
- default:
- last_inp_adv_rval = rval; /* JBV */
- return rval;
- }
- }
- }
-
- /***************************************************************
-
- FUNCTION: inp_const()
-
- DESCRIPTION: This function reads a numerical or string
- constant from <m_buffer> into <s_buffer>,
- incrementing <position> appropriately.
-
- ***************************************************************/
-
- #if ANSI_C
- static int
- inp_const( char *m_buffer, char *s_buffer, int *position )
- #else
- static int
- inp_const( m_buffer, s_buffer, position )
- char *m_buffer;
- char *s_buffer;
- int *position;
- #endif
- {
- int string;
- int s_pos;
- int loop;
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_const(): received argument <%s>.",
- &( m_buffer[ *position ] ) );
- bwb_debug( bwb_ebuf );
- #endif
-
- string = FALSE;
-
- /* first detect string constant */
-
- if ( m_buffer[ *position ] == '\"' )
- {
- string = TRUE;
- ++( *position );
- }
- else
- {
- string = FALSE;
- }
-
- /* build the constant string */
-
- s_buffer[ 0 ] = '\0';
- s_pos = 0;
- loop = TRUE;
-
- while ( loop == TRUE )
- {
-
- switch ( m_buffer[ *position ] )
- {
- case '\0': /* end of string */
- case '\n':
- case '\r':
- return TRUE;
- case ' ': /* whitespace */
- case '\t':
- case ',': /* or end of argument */
- if ( string == FALSE )
- {
- return TRUE;
- }
- else
- {
- s_buffer[ s_pos ] = m_buffer[ *position ];
- ++( *position );
- ++s_buffer;
- s_buffer[ s_pos ] = '\0';
- }
- break;
- case '\"':
- if ( string == TRUE )
- {
- ++( *position ); /* advance beyond quotation mark */
- inp_adv( m_buffer, position );
- return TRUE;
- }
- else
- {
- #if PROG_ERRORS
- sprintf( bwb_ebuf, "Unexpected character in numerical constant." );
- bwb_error( bwb_ebuf );
- #else
- bwb_error( err_syntax );
- #endif
- return FALSE;
- }
- default:
- s_buffer[ s_pos ] = m_buffer[ *position ];
- ++( *position );
- ++s_buffer;
- s_buffer[ s_pos ] = '\0';
- break;
- }
-
- }
-
- return FALSE;
-
- }
-
- #if COMMON_CMDS
-
- /***************************************************************
-
- FUNCTION: bwb_line()
-
- DESCRIPTION: This function implements the BASIC LINE
- INPUT statement.
-
- SYNTAX: LINE INPUT [[#] device-number,]["prompt string";] string-variable$
-
- ***************************************************************/
-
- #if ANSI_C
- struct bwb_line *
- bwb_line( struct bwb_line *l )
- #else
- struct bwb_line *
- bwb_line( l )
- struct bwb_line *l;
- #endif
- {
- int dev_no;
- struct bwb_variable *v;
- FILE *inp_device;
- char tbuf[ MAXSTRINGSIZE + 1 ];
- char pstring[ MAXSTRINGSIZE + 1 ];
- struct exp_ese *e; /* JBV */
- int pos; /* JBV */
-
- /* assign default values */
-
- inp_device = stdin;
-
- pstring[ 0 ] = '\0';
-
- /* advance to first element (INPUT statement) */
-
- adv_element( l->buffer, &( l->position ), tbuf );
- bwb_strtoupper( tbuf );
- if ( strcmp( tbuf, "INPUT" ) != 0 )
- {
- bwb_error( err_syntax );
- return bwb_zline( l );
- }
- adv_ws( l->buffer, &( l->position ) );
-
- /* check for semicolon in first position */
-
- if ( l->buffer[ l->position ] == ';' )
- {
- ++l->position;
- adv_ws( l->buffer, &( l->position ) );
- }
-
- /* else check for# for file number in first position */
-
- else if ( l->buffer[ l->position ] == '#' )
- {
- ++l->position;
- adv_element( l->buffer, &( l->position ), tbuf );
- adv_ws( l->buffer, &( l->position ));
- /* dev_no = atoi( tbuf ); */ /* We really need more, added next (JBV) */
- pos = 0;
- e = bwb_exp( tbuf, FALSE, &pos );
- dev_no = (int) exp_getnval( e );
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_line(): file number requested <%d>", dev_no );
- bwb_debug( bwb_ebuf );
- #endif
-
- if ( dev_table[ dev_no ].cfp == NULL )
- {
- bwb_error( err_dev );
- return bwb_zline( l );
- }
- else
- {
- inp_device = dev_table[ dev_no ].cfp;
- }
- }
-
- /* check for comma */
-
- if ( l->buffer[ l->position ] == ',' )
- {
- ++( l->position );
- adv_ws( l->buffer, &( l->position ));
- }
-
- /* check for quotation mark indicating prompt */
-
- if ( l->buffer[ l->position ] == '\"' )
- {
- inp_const( l->buffer, pstring, &( l->position ) );
- }
-
- /* read the variable for assignment */
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_line(): tbuf <%s>",
- tbuf );
- bwb_debug( bwb_ebuf );
- sprintf( bwb_ebuf, "in bwb_line(): line buffer <%s>",
- &( l->buffer[ l->position ] ) );
- bwb_debug( bwb_ebuf );
- #endif
-
- adv_element( l->buffer, &( l->position ), tbuf );
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_line(): variable buffer <%s>", tbuf );
- bwb_debug( bwb_ebuf );
- #endif
- v = var_find( tbuf );
- if ( v->type != STRING )
- {
- #if PROG_ERRORS
- bwb_error( "in bwb_line(): String variable required" );
- #else
- bwb_error( err_syntax );
- #endif
- return bwb_zline( l );
- }
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in bwb_line(): variable for assignment <%s>", v->name );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* read a line of text into the bufffer */
-
- if ( inp_device == stdin )
- {
- bwx_input( pstring, tbuf );
- }
- else
- {
- /* Was MAXSTRINGSIZE (JBV 9/8/97) */
- fgets( tbuf, MAXSTRINGSIZE + 2, inp_device );
- }
- bwb_stripcr( tbuf );
- str_ctob( var_findsval( v, v->array_pos ), tbuf );
-
- /* end: return next line */
-
- return bwb_zline( l );
- }
-
- #endif /* COMMON_CMDS */
-
- /***************************************************************
-
- FUNCTION: inp_numconst()
-
- DESCRIPTION: This function interprets a numerical
- constant. Added by JBV 10/95
-
- ***************************************************************/
-
- #if ANSI_C
- bnumber
- inp_numconst( char *expression )
- #else
- bnumber
- inp_numconst( expression )
- char *expression;
- #endif
- {
- int base; /* numerical base for the constant */
- static struct bwb_variable mantissa; /* mantissa of floating-point number */
- static int init = FALSE; /* is mantissa variable initialized? */
- int exponent; /* exponent for floating point number */
- int man_start; /* starting point of mantissa */
- int s_pos; /* position in build string */
- int build_loop;
- int need_pm;
- int i;
- bnumber d;
-
- /* Expression stack stuff */
- char type;
- bnumber nval;
- char string[ MAXSTRINGSIZE + 1 ];
- int pos_adv;
-
- /* initialize the variable if necessary */
-
- #if INTENSIVE_DEBUG
- strcpy( mantissa.name, "(mantissa)" );
- #endif
-
- if ( init == FALSE )
- {
- init = TRUE;
- var_make( &mantissa, NUMBER );
- }
-
- /* be sure that the array_pos[ 0 ] for mantissa is set to dim_base;
- this is necessary because mantissa might be used before dim_base
- is set */
-
- mantissa.array_pos[ 0 ] = dim_base;
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_numconst(): received <%s>, eval <%c>",
- expression, expression[ 0 ] );
- bwb_debug( bwb_ebuf );
- #endif
-
- need_pm = FALSE;
- nval = (bnumber) 0;
-
- /* check the first character(s) to determine numerical base
- and starting point of the mantissa */
-
- switch( expression[ 0 ] )
- {
- case '-':
- case '+':
- case '0':
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- case '8':
- case '9':
- case '.':
- base = 10; /* decimal constant */
- man_start = 0; /* starts at position 0 */
- need_pm = FALSE;
- break;
- case '&': /* hex or octal constant */
- if ( ( expression[ 1 ] == 'H' ) || ( expression[ 1 ] == 'h' ))
- {
- base = 16; /* hexadecimal constant */
- man_start = 2; /* starts at position 2 */
- }
- else
- {
- base = 8; /* octal constant */
- if ( ( expression[ 1 ] == 'O' ) || ( expression[ 1 ] == 'o' ))
- {
- man_start = 2; /* starts at position 2 */
- }
- else
- {
- man_start = 1; /* starts at position 1 */
- }
- }
- break;
- default:
-
- #if PROG_ERRORS
- sprintf( bwb_ebuf, "expression <%s> is not a numerical constant.",
- expression );
- bwb_error( bwb_ebuf );
- #else
- bwb_error( err_syntax );
- #endif
- return (bnumber) 0;
- }
-
- /* now build the mantissa according to the numerical base */
-
- switch( base )
- {
-
- case 10: /* decimal constant */
-
- /* initialize counters */
-
- pos_adv = man_start;
- type = NUMBER;
- string[ 0 ] = '\0';
- s_pos = 0;
- exponent = 0;
- build_loop = TRUE;
-
- /* loop to build the string */
-
- while ( build_loop == TRUE )
- {
- switch( expression[ pos_adv ] )
- {
- case '-': /* prefixed plus or minus */
- case '+':
-
- /* in the first position, a plus or minus sign can
- be added to the beginning of the string to be
- scanned */
-
- if ( pos_adv == man_start )
- {
- string[ s_pos ] = expression[ pos_adv ];
- ++pos_adv; /* advance to next character */
- ++s_pos;
- string[ s_pos ] = '\0';
- }
-
- /* but in any other position, the plus or minus sign
- must be taken as an operator and thus as terminating
- the string to be scanned */
-
- else
- {
- build_loop = FALSE;
- }
- break;
- case '.': /* note at least single precision */
- case '0': /* or ordinary digit */
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- case '8':
- case '9':
- string[ s_pos ] = expression[ pos_adv ];
- ++pos_adv; /* advance to next character */
- ++s_pos;
- string[ s_pos ] = '\0';
- break;
-
- case '#': /* Microsoft-type precision indicator; ignored but terminates */
- case '!': /* Microsoft-type precision indicator; ignored but terminates */
- ++pos_adv; /* advance to next character */
- type = NUMBER;
- exponent = FALSE;
- build_loop = FALSE;
- break;
-
- case 'E': /* exponential, single precision */
- case 'e':
- ++pos_adv; /* advance to next character */
- type = NUMBER;
- exponent = TRUE;
- build_loop = FALSE;
- break;
-
- case 'D': /* exponential, double precision */
- case 'd':
- ++pos_adv; /* advance to next character */
- type = NUMBER;
- exponent = TRUE;
- build_loop = FALSE;
- break;
-
- default: /* anything else, terminate */
- build_loop = FALSE;
- break;
- }
-
- }
-
- /* assign the value to the mantissa variable */
-
- #if NUMBER_DOUBLE
- sscanf( string, "%lf", var_findnval( &mantissa, mantissa.array_pos ));
- #else
- sscanf( string, "%f", var_findnval( &mantissa, mantissa.array_pos ));
- #endif
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_numconst(): read mantissa, string <%s> val <%lf>",
- string, var_getnval( &mantissa ) );
- bwb_debug( bwb_ebuf );
- #endif
-
- /* test if integer bounds have been exceeded */
-
- if ( type == NUMBER )
- {
- i = (int) var_getnval( &mantissa );
- d = (bnumber) i;
- if ( d != var_getnval( &mantissa ))
- {
- type = NUMBER;
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_numconst(): integer bounds violated, promote to NUMBER" );
- bwb_debug( bwb_ebuf );
- #endif
- }
- }
-
- /* read the exponent if there is one */
-
- if ( exponent == TRUE )
- {
-
- /* allow a plus or minus once at the beginning */
-
- need_pm = TRUE;
-
- /* initialize counters */
-
- string[ 0 ] = '\0';
- s_pos = 0;
- build_loop = TRUE;
-
- /* loop to build the string */
-
- while ( build_loop == TRUE )
- {
- switch( expression[ pos_adv ] )
- {
- case '-': /* prefixed plus or minus */
- case '+':
-
- if ( need_pm == TRUE ) /* only allow once */
- {
- string[ s_pos ] = expression[ pos_adv ];
- ++pos_adv; /* advance to next character */
- ++s_pos;
- string[ s_pos ] = '\0';
- }
- else
- {
- build_loop = FALSE;
- }
- break;
-
- case '0': /* or ordinary digit */
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- case '8':
- case '9':
-
- string[ s_pos ] = expression[ pos_adv ];
- ++pos_adv; /* advance to next character */
- ++s_pos;
- string[ s_pos ] = '\0';
- need_pm = FALSE;
- break;
-
- default: /* anything else, terminate */
- build_loop = FALSE;
- break;
- }
-
- } /* end of build loop for exponent */
-
- /* assign the value to the user variable */
-
- #if NUMBER_DOUBLE
- sscanf( string, "%lf", &nval );
- #else
- sscanf( string, "%f", &nval );
- #endif
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_numconst(): exponent is <%d>",
- (int) nval );
- bwb_debug( bwb_ebuf );
- #endif
-
- } /* end of exponent search */
-
- if ( nval == (bnumber) 0 )
- {
- nval = var_getnval( &mantissa );
- }
- else
- {
- nval = var_getnval( &mantissa )
- * pow( (bnumber) 10.0, (bnumber) nval );
- }
-
- break;
-
- case 8: /* octal constant */
-
- /* initialize counters */
-
- pos_adv = man_start;
- type = NUMBER;
- string[ 0 ] = '\0';
- s_pos = 0;
- exponent = 0;
- build_loop = TRUE;
-
- /* loop to build the string */
-
- while ( build_loop == TRUE )
- {
- switch( expression[ pos_adv ] )
- {
- case '0': /* or ordinary digit */
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- string[ s_pos ] = expression[ pos_adv ];
- ++pos_adv; /* advance to next character */
- ++s_pos;
- string[ s_pos ] = '\0';
- break;
-
- default: /* anything else, terminate */
- build_loop = FALSE;
- break;
- }
-
- }
-
- /* now scan the string to determine the number */
-
- sscanf( string, "%o", &i );
- nval = (bnumber) i;
-
- break;
-
- case 16: /* hexadecimal constant */
-
- /* initialize counters */
-
- pos_adv = man_start;
- type = NUMBER;
- string[ 0 ] = '\0';
- s_pos = 0;
- exponent = 0;
- build_loop = TRUE;
-
- /* loop to build the string */
-
- while ( build_loop == TRUE )
- {
- switch( expression[ pos_adv ] )
- {
- case '0': /* or ordinary digit */
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- case '6':
- case '7':
- case '8':
- case '9':
- case 'A':
- case 'a':
- case 'B':
- case 'b':
- case 'C':
- case 'c':
- case 'D':
- case 'd':
- case 'E':
- case 'e':
- case 'F': /* Don't forget these! (JBV) */
- case 'f':
- string[ s_pos ] = expression[ pos_adv ];
-
- ++pos_adv; /* advance to next character */
- ++s_pos;
- string[ s_pos ] = '\0';
- break;
-
- default: /* anything else, terminate */
- build_loop = FALSE;
- break;
- }
-
- }
-
- /* now scan the string to determine the number */
-
- sscanf( string, "%x", &i );
- nval = (bnumber) i;
- break;
- }
-
- #if INTENSIVE_DEBUG
- sprintf( bwb_ebuf, "in inp_numconst(): precision <%c> value <%lf>",
- type, nval );
- bwb_debug( bwb_ebuf );
- #endif
-
- return nval;
-
- }
|