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bwb_inp.c
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3525 lines (3278 loc) · 80.8 KB
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/***************************************************************
bwb_inp.c Input Routines
for Bywater BASIC Interpreter
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). */
/* */
/* Those additionally marked with "DD" were at the suggestion of */
/* Dale DePriest (daled@cadence.com). */
/* */
/* Version 3.00 by Howard Wulf, AF5NE */
/* */
/* Version 3.10 by Howard Wulf, AF5NE */
/* */
/* Version 3.20 by Howard Wulf, AF5NE */
/* */
/*---------------------------------------------------------------*/
#include "bwbasic.h"
static LineType *C77_file_input (LineType * Line, int FileNumber);
static LineType *C77_file_input_finish (LineType * Line);
static LineType *C77_file_input_line (LineType * Line);
static LineType *C77_user_input_line (LineType * Line, char *Prompt,
int IsDisplayQuestionMark);
static void CleanTextInput (char *buffer);
static LineType *D71_GET (LineType * Line);
static LineType *data_if_end (LineType * Line);
static LineType *data_restore (LineType * Line);
static ResultType file_data (VariableType * Variable, char *tbuf, int tlen);
static LineType *file_if_end (LineType * Line);
static LineType *file_input (LineType * Line);
static LineType *file_read_matrix (LineType * Line);
static LineType *file_restore (LineType * Line);
static LineType *H14_GET (LineType * Line);
static ResultType input_data (VariableType * Variable, char *tbuf, int tlen);
static ResultType parse_number (char *buffer, int *position, VariantType * X,
int IsConsoleInput);
static ResultType parse_string (char *buffer, int *position, VariantType * X);
static ResultType parse_string_isquoted (char *buffer, int *position,
VariantType * X);
static ResultType parse_string_unquoted (char *buffer, int *position,
VariantType * X);
static ResultType read_data (VariableType * Variable);
static LineType *read_file (LineType * Line);
static LineType *read_list (LineType * Line);
static LineType *S70_GET (LineType * Line);
static LineType *user_input_loop (LineType * Line);
static ResultType user_input_values (LineType * Line, char *buffer,
int IsReal);
int
bwb_is_eof (FILE * fp)
{
/*
Have you ever wondered why C file I/O is slow? Here is the reason:
feof() is not set until after a file read error occurs; sad but true.
In order to determine whether you are at the end-of-file,
you have to call both ftell() and fseek() twice,
which effectively trashes any I/O cache scheme.
*/
assert (fp != NULL);
if (fp != NULL)
{
long current;
long total;
current = ftell (fp);
fseek (fp, 0, SEEK_END);
total = ftell (fp);
if (total == current)
{
/* EOF */
return TRUE;
}
else
{
/* NOT EOF */
fseek (fp, current, SEEK_SET);
return FALSE;
}
}
/* a closed file is always EOF */
return TRUE;
}
static void
CleanTextInput (char *buffer)
{
/*
**
** Clean the TEXT in the INPUT buffer after fgets(). Not for RANDOM or BINARY.
**
*/
char *E;
assert (buffer != NULL);
/*
**
** some compilers remove CR, but not LF.
** some compilers remove LF, but not CR.
** some compilers remove CR/LF but not LF/CR.
** some compilers remove both CR and LF.
** some compilers remove the first CR or LF, but not the second LF or CR.
** some compilers don't remove either CR or LF.
** and so on.
**
*/
E = bwb_strchr (buffer, '\r');
if (E != NULL)
{
*E = NulChar;
}
E = bwb_strchr (buffer, '\n');
if (E != NULL)
{
*E = NulChar;
}
/*
**
** Suppress all control characters.
** In theory, there should not be any control characters at all.
** In reality, they occassionally occur.
**
*/
while (*buffer)
{
if (bwb_isprint (*buffer) == FALSE)
{
*buffer = ' ';
}
buffer++;
}
}
/***************************************************************
FUNCTION: bwx_input()
DESCRIPTION: This function outputs the string pointed
to by 'prompt', then inputs a character
string.
***************************************************************/
extern int
bwx_input (char *prompt, int IsDisplayQuestionMark, char *answer, int MaxLen)
{
assert (answer != NULL);
assert(My != NULL);
assert(My->SYSOUT != NULL);
assert(My->SYSOUT->cfp != NULL);
assert(My->SYSIN != NULL);
assert(My->SYSIN->cfp != NULL);
if (prompt != NULL)
{
while (*prompt)
{
if (*prompt == '\n')
{
My->SYSOUT->col = 0; /* incremented below */
My->SYSOUT->row++;
}
else
if (My->SYSOUT->width > 0
&& My->SYSOUT->col > My->SYSOUT->width /* && *prompt != '\n' */ )
{
fputc ('\n', My->SYSOUT->cfp);
My->SYSOUT->col = 0; /* incremented below */
My->SYSOUT->row++;
}
fputc (*prompt, My->SYSOUT->cfp);
My->SYSOUT->col++;
prompt++;
}
}
if (IsDisplayQuestionMark)
{
fputs ("? ", My->SYSOUT->cfp);
My->SYSOUT->col += 2;
}
fflush (My->SYSOUT->cfp);
/*
**
** for PTR or OPTION STDIN ...
**
*/
if (My->SYSIN->cfp != stdin)
{
/* this file was opened by PTR or OPTION STDIN commands */
if (fgets (answer, MaxLen, My->SYSIN->cfp)) /* bwx_input */
{
answer[MaxLen] = NulChar;
CleanTextInput (answer);
fputs (answer, My->SYSOUT->cfp);
fputc ('\n', My->SYSOUT->cfp);
fflush (My->SYSOUT->cfp);
ResetConsoleColumn ();
return TRUE;
}
/* stop reading from PTR or OPTION STDIN once all INPUT lines have been read */
bwb_fclose (My->SYSIN->cfp);
My->SYSIN->cfp = stdin;
/* INPUT reverts to stdin */
}
/* My->SYSIN->cfp == stdin */
/*
**
** ... for PTR or OPTION STDIN
**
*/
/*
**
** for automated testing ...
**
*/
if (My->ExternalInputFile != NULL)
{
/* this file was opened by --TAPE command line parameter */
if (fgets (answer, MaxLen, My->ExternalInputFile)) /* bwx_input */
{
answer[MaxLen] = NulChar;
CleanTextInput (answer);
fputs (answer, My->SYSOUT->cfp);
fputc ('\n', My->SYSOUT->cfp);
fflush (My->SYSOUT->cfp);
ResetConsoleColumn ();
return TRUE;
}
/* stop reading from --TAPE once all INPUT lines have been read */
bwb_fclose (My->ExternalInputFile);
My->ExternalInputFile = NULL;
/* INPUT reverts to My->SYSIN->cfp */
}
/*
**
** ... for automated testing
**
*/
if (fgets (answer, MaxLen, My->SYSIN->cfp)) /* bwx_input */
{
/* this is stdin */
answer[MaxLen] = NulChar;
CleanTextInput (answer);
ResetConsoleColumn ();
return TRUE;
}
/* nothing was read from stdin */
answer[0] = NulChar;
CleanTextInput (answer);
ResetConsoleColumn ();
return FALSE;
}
extern LineType *
bwb_BACKSPACE (LineType * Line)
{
assert (Line != NULL);
assert(My != NULL);
assert(My->SYSIN != NULL);
assert(My->SYSIN->cfp != NULL);
My->CurrentFile = My->SYSIN;
if (line_skip_FilenumChar (Line))
{
/* BACKSPACE # filenum */
int FileNumber;
if (line_read_integer_expression (Line, &FileNumber) == FALSE)
{
WARN_SYNTAX_ERROR;
return (Line);
}
if (FileNumber < 0)
{
/* "BACKSPACE # -1" is silently ignored */
return (Line);
}
if (FileNumber == 0)
{
/* "BACKSPACE # 0" is silently ignored */
return (Line);
}
My->CurrentFile = find_file_by_number (FileNumber);
if (My->CurrentFile == NULL)
{
WARN_BAD_FILE_NUMBER;
return (Line);
}
if ((My->CurrentFile->DevMode & DEVMODE_READ) == 0)
{
WARN_BAD_FILE_NUMBER;
return (Line);
}
/* not for the console */
/* if( TRUE ) */
{
FILE *f;
long Offset;
int DelimiterCount;
int InQuote;
int C;
f = My->CurrentFile->cfp;
Offset = ftell (f);
Offset--;
DelimiterCount = 0;
InQuote = FALSE;
AGAIN:
if (Offset <= 0)
{
goto DONE;
}
fseek (f, Offset, SEEK_SET);
C = fgetc (f);
if (InQuote)
{
if (C == My->CurrentVersion->OptionQuoteChar)
{
InQuote = FALSE;
}
Offset--;
goto AGAIN;
}
if (C == My->CurrentVersion->OptionQuoteChar)
{
InQuote = TRUE;
Offset--;
goto AGAIN;
}
if (C == ',')
{
DelimiterCount++;
if (DelimiterCount > 1)
{
Offset++;
goto DONE;
}
Offset--;
goto AGAIN;
}
if (C == '\n')
{
DelimiterCount++;
if (DelimiterCount > 1)
{
Offset++;
goto DONE;
}
Offset--;
if (Offset <= 0)
{
goto DONE;
}
fseek (f, Offset, SEEK_SET);
C = fgetc (f);
if (C == '\r')
{
Offset--;
}
goto AGAIN;
}
if (C == '\r')
{
DelimiterCount++;
if (DelimiterCount > 1)
{
Offset++;
goto DONE;
}
Offset--;
if (Offset <= 0)
{
goto DONE;
}
fseek (f, Offset, SEEK_SET);
C = fgetc (f);
if (C == '\n')
{
Offset--;
}
goto AGAIN;
}
Offset--;
goto AGAIN;
DONE:
if (Offset < 0)
{
Offset = 0;
}
fseek (f, Offset, SEEK_SET);
}
}
/* BACKSPACE for console is silently ignored */
return (Line);
}
/***************************************************************
FUNCTION: bwb_read()
DESCRIPTION: This function implements the BASIC READ
statement.
SYNTAX: READ variable[, variable...]
***************************************************************/
static LineType *
C77_file_input (LineType * Line, int FileNumber)
{
/*
CBASIC-II: SERIAL & RANDOM file reads
READ # FileNumber ; [ scalar [ , ... ] ] ' SERIAL
READ # FileNumber , RecordNumber ; [ scalar [ , ... ] ] ' RANDOM
*/
assert (Line != NULL);
assert(My != NULL);
if (FileNumber <= 0)
{
WARN_BAD_FILE_NUMBER;
return (Line);
}
/* normal file */
My->CurrentFile = find_file_by_number (FileNumber);
if (My->CurrentFile == NULL)
{
WARN_BAD_FILE_NUMBER;
return (Line);
}
if (line_skip_CommaChar (Line) /* comma-specific */ )
{
/*
READ # FileNumber , RecordNumber ; [ scalar [ , ... ] ] ' RANDOM
*/
/* get the RecordNumber */
int RecordNumber;
if ((My->CurrentFile->DevMode & DEVMODE_RANDOM) == 0)
{
WARN_BAD_FILE_MODE;
return (Line);
}
if (My->CurrentFile->width <= 0)
{
WARN_FIELD_OVERFLOW;
return (Line);
}
if (line_read_integer_expression (Line, &RecordNumber) == FALSE)
{
WARN_SYNTAX_ERROR;
return (Line);
}
if (RecordNumber <= 0)
{
WARN_BAD_RECORD_NUMBER;
return (Line);
}
RecordNumber--; /* BASIC to C */
/* if( TRUE ) */
{
long offset;
offset = RecordNumber;
offset *= My->CurrentFile->width;
fseek (My->CurrentFile->cfp, offset, SEEK_SET);
}
}
if (line_is_eol (Line))
{
/* READ # filenum */
/* READ # filenum , recnum */
return (Line);
}
if (line_skip_SemicolonChar (Line) /* semicolon specific */ )
{
/* READ # filenum ; */
/* READ # filenum , recnum ; */
}
else
{
WARN_SYNTAX_ERROR;
return (Line);
}
if (line_is_eol (Line))
{
return (Line);
}
/* input is not from #0, so branch to file_input() */
return file_input (Line);
}
static LineType *
data_if_end (LineType * Line)
{
WARN_OUT_OF_DATA;
return (Line);
}
static ResultType
read_data (VariableType * Variable)
{
/*
**
** read one DATA item
**
*/
ResultType Result;
VariantType Variant;
VariantType *X;
assert (Variable != NULL);
assert(My != NULL);
assert(My->SYSIN != NULL);
assert(My->SYSIN->cfp != NULL);
assert (My->CurrentFile == My->SYSIN);
assert(My->DataLine != NULL);
assert(My->EndMarker != NULL);
Result = RESULT_UNPARSED;
X = &Variant;
CLEAR_VARIANT (X);
if (My->DataLine == My->EndMarker)
{
return RESULT_UNPARSED;
}
if (My->DataLine->cmdnum != C_DATA)
{
WARN_INTERNAL_ERROR;
return RESULT_UNPARSED;
}
if (VAR_IS_STRING (Variable))
{
Result = parse_string (My->DataLine->buffer, &My->DataPosition, X);
}
else
{
Result = parse_number (My->DataLine->buffer, &My->DataPosition, X, FALSE);
}
if (Result == RESULT_UNPARSED)
{
WARN_BAD_DATA;
}
if (Result != RESULT_SUCCESS)
{
return Result;
}
/*
**
** OK
**
*/
if (X->VariantTypeCode == StringTypeCode
&& My->CurrentVersion->OptionFlags & OPTION_BUGS_ON ) /* DATA allows embedded quote pairs */
{
int i;
int n;
n = X->Length;
for (i = 0; i < n; i++)
{
if (X->Buffer[i + 0] == My->CurrentVersion->OptionQuoteChar
&& X->Buffer[i + 1] == My->CurrentVersion->OptionQuoteChar)
{
bwb_strncpy (&X->Buffer[i + 0], &X->Buffer[i + 1], n - i);
n--;
}
}
X->Length = n;
}
if (var_set (Variable, X) == FALSE)
{
WARN_VARIABLE_NOT_DECLARED;
return RESULT_UNPARSED;
}
/*
**
** Note: do NOT free() or RELEASE_VARIANT because 'X->Buffer' points into 'buffer'
**
*/
if (buff_is_eol (My->DataLine->buffer, &My->DataPosition))
{
/* at the end of the current DATA statement */
if (My->CurrentVersion->OptionFlags & OPTION_COVERAGE_ON)
{
/* this line has been READ */
My->DataLine->LineFlags |= LINE_EXECUTED;
}
My->DataLine = My->DataLine->OtherLine;
My->DataPosition = My->DataLine->Startpos;
return RESULT_SUCCESS;
}
if (buff_skip_char (My->DataLine->buffer, &My->DataPosition, My->CurrentFile->delimit)) /* buff_skip_comma */
{
return RESULT_SUCCESS;
}
/* garbage after the value we just READ */
WARN_BAD_DATA;
return RESULT_UNPARSED;
}
static LineType *
read_list (LineType * Line)
{
/* READ varlist */
assert (Line != NULL);
assert(My != NULL);
assert(My->SYSIN != NULL);
assert(My->SYSIN->cfp != NULL);
assert (My->CurrentFile == My->SYSIN);
do
{
VariableType *Variable;
/* get a variable */
if ((Variable = line_read_scalar (Line)) == NULL)
{
WARN_SYNTAX_ERROR;
return (Line);
}
/* READ data into the variable */
if (read_data (Variable) != RESULT_SUCCESS)
{
return data_if_end (Line);
}
}
while (line_skip_seperator (Line));
return (Line);
}
static LineType *
read_file (LineType * Line)
{
/* READ # filenum, varlist */
int FileNumber;
assert (Line != NULL);
assert(My != NULL);
assert(My->CurrentVersion != NULL);
if (line_read_integer_expression (Line, &FileNumber) == FALSE)
{
WARN_SYNTAX_ERROR;
return (Line);
}
if (My->CurrentVersion->OptionVersionValue & (C77))
{
return C77_file_input (Line, FileNumber);
}
/*
SERIAL file reads:
READ # FileNumber
READ # FileNumber [, scalar]
*/
if (line_skip_seperator (Line))
{
/* required */
}
else
{
WARN_SYNTAX_ERROR;
return (Line);
}
if (FileNumber < 0)
{
/* "READ # -1" is an error */
WARN_BAD_FILE_NUMBER;
return (Line);
}
if (FileNumber > 0)
{
/* normal file */
My->CurrentFile = find_file_by_number (FileNumber);
if (My->CurrentFile == NULL)
{
WARN_BAD_FILE_NUMBER;
return (Line);
}
if ((My->CurrentFile->DevMode & DEVMODE_READ) == 0)
{
WARN_BAD_FILE_NUMBER;
return (Line);
}
/* input is not from #0, so branch to file_input() */
return file_input (Line);
}
/* "READ # 0, varlist" is the same as "READ varlist" */
return read_list (Line);
}
extern LineType *
bwb_READ (LineType * Line)
{
assert (Line != NULL);
assert(My != NULL);
assert(My->SYSIN != NULL);
assert(My->SYSIN->cfp != NULL);
My->CurrentFile = My->SYSIN;
if (line_skip_FilenumChar (Line))
{
return read_file (Line);
}
return read_list (Line);
}
/***************************************************************
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]...
***************************************************************/
extern LineType *
bwb_DATA (LineType * Line)
{
assert (Line != NULL);
if (Line->LineFlags & (LINE_USER))
{
WARN_ILLEGAL_DIRECT;
return (Line);
}
line_skip_eol (Line);
return (Line);
}
/***************************************************************
FUNCTION: bwb_restore()
DESCRIPTION: This function implements the BASIC RESTORE
statement.
SYNTAX: RESTORE [line number]
***************************************************************/
extern LineType *
bwb_RESET (LineType * Line)
{
/* RESET filename$ [, ...] */
VariantType E;
VariantType *e;
assert (Line != NULL);
assert(My != NULL);
assert(My->SYSIN != NULL);
assert(My->SYSIN->cfp != NULL);
e = &E; /* no leaks */
My->CurrentFile = My->SYSIN;
do
{
CLEAR_VARIANT (e);
if (line_read_expression (Line, e) == FALSE) /* bwb_RESET */
{
WARN_SYNTAX_ERROR;
return (Line);
}
if (e->VariantTypeCode == StringTypeCode)
{
/* STRING */
/* RESET filename$ ... */
My->CurrentFile = find_file_by_name (e->Buffer);
}
else
{
/* NUMBER -- file must already be OPEN */
/* RESET filenumber ... */
My->CurrentFile = find_file_by_number ((int) bwb_rint (e->Number));
}
RELEASE_VARIANT (e);
if (My->CurrentFile == NULL)
{
/* file not OPEN */
/* silently ignored */
}
else if (My->CurrentFile == My->SYSIN)
{
/* silently ignored */
}
else if (My->CurrentFile == My->SYSOUT)
{
/* silently ignored */
}
else if (My->CurrentFile == My->SYSPRN)
{
/* silently ignored */
}
else
{
/* normal file is OPEN */
My->CurrentFile->width = 0;
My->CurrentFile->col = 1;
My->CurrentFile->row = 1;
My->CurrentFile->delimit = ',';
fseek (My->CurrentFile->cfp, 0, SEEK_SET);
}
}
while (line_skip_seperator (Line));
return (Line);
}
extern LineType *
bwb_CLOSE (LineType * Line)
{
/* CLOSE filename$ ' can be any string expression */
/* CLOSE filenumber ' can be any numeric expression */
assert (Line != NULL);
assert(My != NULL);
assert(My->SYSIN != NULL);
assert(My->SYSIN->cfp != NULL);
assert(My->SYSOUT != NULL);
assert(My->SYSOUT->cfp != NULL);
assert(My->SYSPRN != NULL);
assert(My->SYSPRN->cfp != NULL);
My->CurrentFile = My->SYSIN;
if (line_is_eol (Line))
{
/* CLOSE */
FileType *F;
for (F = My->FileHead; F != NULL; F = F->next)
{
field_close_file (F);
file_clear (F);
}
return (Line);
}
do
{
VariantType E;
VariantType *e;
e = &E;
if (line_read_expression (Line, e) == FALSE) /* bwb_CLOSE */
{
WARN_SYNTAX_ERROR;
return (Line);
}
if (e->VariantTypeCode == StringTypeCode)
{
/* STRING */
/* CLOSE filename$ ... */
My->CurrentFile = find_file_by_name (e->Buffer);
}
else
{
/* CLOSE filenumber */
My->CurrentFile = find_file_by_number (e->Number);
}
if (My->CurrentFile == NULL)
{
/* file not OPEN */
/* silently ignored */
}
else if (My->CurrentFile == My->SYSIN)
{
/* silently ignored */
}
else if (My->CurrentFile == My->SYSOUT)
{
/* silently ignored */
}
else if (My->CurrentFile == My->SYSPRN)
{
/* silently ignored */
}
else
{
/* normal file is OPEN */
field_close_file (My->CurrentFile);
file_clear (My->CurrentFile);
}
RELEASE_VARIANT (e);
}
while (line_skip_seperator (Line));
return (Line);
}
static LineType *
data_restore (LineType * Line)
{
int LineNumber;
LineType *x;
assert (Line != NULL);
assert(My != NULL);
if (line_is_eol (Line))
{
/* RESTORE */
assert (My->StartMarker != NULL);
My->DataLine = My->StartMarker->OtherLine;
assert (My->DataLine != NULL);
My->DataPosition = My->DataLine->Startpos;
return (Line);
}
if (line_read_integer_expression (Line, &LineNumber))
{
/* RESTORE linenumber */
x = find_line_number (LineNumber); /* RESTORE 100 */
if (x != NULL)
{
for (; x->cmdnum != C_DATA && x != My->EndMarker; x = x->next);
My->DataLine = x;
assert (My->DataLine != NULL);
My->DataPosition = My->DataLine->Startpos;
return (Line);
}
}
WARN_SYNTAX_ERROR;
return (Line);
}
static LineType *
file_restore (LineType * Line)
{
/* RESTORE # FileNumber */
int FileNumber;
assert (Line != NULL);
assert(My != NULL);
if (line_read_integer_expression (Line, &FileNumber) == FALSE)
{
WARN_BAD_FILE_NUMBER;
return (Line);
}
if (FileNumber < 0)