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BASICloader.c
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BASICloader.c
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/*
BASICloader.c
A program by Richard Cavell (c) 2017-2019
https://github.com/richardcavell/BASICloader
Coding standards:
* We strictly use C89 only
* No external libraries, no POSIX, no GNU extensions
* Everything in one file to make building easier
* Every error that can reasonably be detected, is detected
* This code is intended to be capable of being compiled with
retro machines and compilers. Many of these machines and
compilers are really limited, and predate *all* C standards.
Ways you can modify this code:
* Customizable values can be found further down
*/
/* All of these #includes are from the standard library */
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
/* End of #includes */
/* Some important enumerations and associated text #defines */
enum architecture
{
NO_ARCHITECTURE_CHOSEN = 0,
COCO,
DRAGON,
C64
};
#define COCO_TEXT "coco"
#define DRAGON_TEXT "dragon"
#define C64_TEXT "c64"
enum file_format
{
NO_FILE_FORMAT_CHOSEN = 0,
BINARY,
RS_DOS,
DRAGON_DOS,
PRG
};
#define BINARY_TEXT "binary"
#define RS_DOS_TEXT "rsdos"
#define DRAGON_DOS_TEXT "dragondos"
#define PRG_TEXT "prg"
static
enum case_choice /* Note that "case" is a C keyword */
{
NO_CASE_CHOSEN = 0,
UPPERCASE,
LOWERCASE,
MIXED_CASE
};
#define UPPERCASE_TEXT "upper"
#define LOWERCASE_TEXT "lower"
#define MIXED_CASE_TEXT "mixed"
/* End of enumerations and associated text #defines */
/* Customizable values */
#define DEFAULT_OUTPUT_FILENAME "LOADER.BAS"
#define DEFAULT_C64LC_OUTPUT_FILENAME "loader"
#define DEFAULT_ARCHITECTURE COCO
#define DEFAULT_INPUT_FILE_FORMAT BINARY
#define DEFAULT_OUTPUT_CASE UPPERCASE
#define DEFAULT_STARTING_LINE 0
#define DEFAULT_TYPABLE_STARTING_LINE 10
#define MAXIMUM_STARTING_LINE 63000
#define DEFAULT_STEP 1
#define DEFAULT_TYPABLE_STEP 10
/* MINIMUM_STEP is defined below */
#define MAXIMUM_STEP 60000
#define MAXIMUM_LINE_COUNT 1000
#define MAXIMUM_LINE_LENGTH 75
#define MAXIMUM_CHECKSUMMED_DATA_PER_LINE 10
#define MAXIMUM_INPUT_FILE_SIZE 65000
#define MAXIMUM_BINARY_SIZE 65000
#define MAXIMUM_BASIC_PROGRAM_SIZE 60000
#define TEXT_BUFFER_SIZE 300
#define PRINT_WARNINGS_TO_STDERR 0
#define STDOUT_FILENAME_SUBSTITUTE "-"
#define COCO_DEFAULT_START 0x3e00
#define DRAGON_DEFAULT_START 0x3e00
#define C64_DEFAULT_START 0x8000
/* End of customizable values */
/* Values to help check that the customizable values are sensible */
#define MINIMUM_DEFAULT_OUTPUT_FILENAME_LENGTH 1
#define MINIMUM_DEFAULT_C64LC_OUTPUT_FILENAME_LENGTH 1
#define DEFAULT_STARTING_LINES_MUST_BE_POSITIVE 1
#define MINIMUM_STEP 1
#define MINIMUM_MAXIMUM_LINE_COUNT 5
#define MINIMUM_MAXIMUM_LINE_LENGTH 20
#define MINIMUM_CHECKSUMMED_DATA_PER_LINE 1
#define MINIMUM_MAXIMUM_INPUT_FILE_SIZE 1
#define MINIMUM_MAXIMUM_BINARY_SIZE 1
#define MINIMUM_MAXIMUM_BASIC_PROGRAM_SIZE 50
#define MINIMUM_TEXT_BUFFER_SIZE 100
#define MINIMUM_STDOUT_FILENAME_SUBSTITUTE_LENGTH 1
#define LINE_COUNT_BENCHMARK 100
/* End of values that help check the customizable values */
/* Architecture-specific values */
#define COCO_MIN_LINE_NUMBER 0
#define DRAGON_MIN_LINE_NUMBER 0
#define C64_MIN_LINE_NUMBER 0
#define MIN_LINE_NUMBER 0
#define COCO_MAX_LINE_NUMBER 63999
#define DRAGON_MAX_LINE_NUMBER 63999
#define C64_MAX_LINE_NUMBER 63999
#define MAX_LINE_NUMBER 63999
/* Not including the \n at the end, or any terminating zero, and
starting counting from 1 */
#define COCO_MAX_LINE_LENGTH 249
#define DRAGON_MAX_LINE_LENGTH 249
#define C64_MAX_LINE_LENGTH 79
#define MAX_BASIC_LINE_LENGTH 249
#define LOWEST_RAM_ADDRESS 0
#define HIGHEST_COCO_ADDRESS HIGHEST_64K_ADDRESS
#define HIGHEST_DRAGON_ADDRESS HIGHEST_64K_ADDRESS
#define HIGHEST_C64_ADDRESS HIGHEST_64K_ADDRESS
#define HIGHEST_RAM_ADDRESS HIGHEST_64K_ADDRESS
/* End of architecture-specific values */
/* File format-specific values */
#define RS_DOS_FILE_PREAMBLE_SIZE 5
#define RS_DOS_FILE_POSTAMBLE_SIZE 5
#define DRAGON_DOS_FILE_HEADER_SIZE 9
#define PRG_FILE_HEADER_SIZE 2
#define BINARY_FILE_SIZE_MINIMUM 1
#define RS_DOS_FILE_SIZE_MINIMUM (RS_DOS_FILE_PREAMBLE_SIZE \
+ RS_DOS_FILE_POSTAMBLE_SIZE \
+ 1)
#define DRAGON_DOS_FILE_SIZE_MINIMUM (DRAGON_DOS_FILE_HEADER_SIZE + 1)
#define PRG_FILE_SIZE_MINIMUM (PRG_FILE_HEADER_SIZE + 1)
/* End of file format-specific values */
/* 8-bit architecture-specific values */
#define HIGHEST_64K_ADDRESS 0xffff
#define HIGHEST_32K_ADDRESS 0x7fff
#define HIGHEST_16K_ADDRESS 0x3fff
#define HIGHEST_8K_ADDRESS 0x1fff
#define HIGHEST_4K_ADDRESS 0x0fff
#define EIGHT_BIT_BYTE_MAX 255
#define FILE_SIZE_MAX 65535
/* End of 8-bit architecture-specific values */
/* Typedefs and limits macros */
typedef unsigned short int boolean_type;
typedef unsigned short int line_number_type;
typedef unsigned short int line_number_step_type;
typedef unsigned short int line_counter_type;
typedef unsigned short int line_position_type;
typedef unsigned short int memory_location_type;
typedef unsigned short int file_size_type;
#define LINE_NUMBER_TYPE_MIN 0
#define LINE_NUMBER_TYPE_MAX (line_number_type) -1
#define LINE_NUMBER_STEP_TYPE_MAX (line_number_step_type) -1
#define LINE_COUNTER_TYPE_MAX (line_counter_type) -1
#define LINE_POSITION_TYPE_MAX (line_position_type) -1
#define MEMORY_LOCATION_TYPE_MAX (memory_location_type) -1
#define FILE_SIZE_TYPE_MAX (file_size_type) -1
/* End of typedefs and limits macros */
/* Code starts here */
static void
internal_error(const char *fmt, ...)
{
va_list ap;
(void) fprintf(stderr, "Internal error: ");
va_start(ap, fmt);
(void) vfprintf(stderr, fmt, ap);
va_end(ap);
(void) fprintf(stderr, "\n"
"Please report this to Richard Cavell\n"
"at richardcavell@mail.com\n");
exit(EXIT_FAILURE);
}
static void
check_uchar_type(void)
{
if (UCHAR_MAX < EIGHT_BIT_BYTE_MAX)
internal_error("This machine cannot process 8-bit bytes");
}
static void
check_user_defined_type_limits(void)
{
if (LINE_NUMBER_TYPE_MIN > MIN_LINE_NUMBER)
internal_error("Line number type has insufficient lower range");
if (LINE_NUMBER_TYPE_MAX < MAX_LINE_NUMBER)
internal_error("Line number type has insufficient upper range");
if (LINE_COUNTER_TYPE_MAX < LINE_COUNT_BENCHMARK)
internal_error("Line counter type has insufficient range");
if (LINE_POSITION_TYPE_MAX < COCO_MAX_LINE_LENGTH ||
LINE_POSITION_TYPE_MAX < DRAGON_MAX_LINE_LENGTH ||
LINE_POSITION_TYPE_MAX < C64_MAX_LINE_LENGTH ||
LINE_POSITION_TYPE_MAX < MAX_BASIC_LINE_LENGTH)
internal_error("Line position type has insufficient range");
if (MEMORY_LOCATION_TYPE_MAX < HIGHEST_RAM_ADDRESS)
internal_error("Memory location type has insufficient range");
if (FILE_SIZE_TYPE_MAX < FILE_SIZE_MAX)
internal_error("File size type has insufficient range");
}
static void
check_default_starting_line(void)
{
const char macro_name[] = "DEFAULT_STARTING_LINE";
if (DEFAULT_STARTING_LINE < LINE_NUMBER_TYPE_MIN)
internal_error("%s\n"
"is too low to be represented internally",
macro_name);
if (DEFAULT_STARTING_LINE > LINE_NUMBER_TYPE_MAX)
internal_error("%s\n"
"is too high to be represented internally",
macro_name);
if (DEFAULT_STARTING_LINE < MIN_LINE_NUMBER)
internal_error("%s\n"
"is below the minimum possible BASIC line number",
macro_name);
if (DEFAULT_STARTING_LINE > MAX_LINE_NUMBER)
internal_error("%s\n"
"is above the maximum possible BASIC line number",
macro_name);
}
static void
check_default_typable_starting_line(void)
{
const char macro_name[] = "DEFAULT_TYPABLE_STARTING_LINE";
if (DEFAULT_TYPABLE_STARTING_LINE < LINE_NUMBER_TYPE_MIN)
internal_error("%s\n"
"is too low to be represented internally",
macro_name);
if (DEFAULT_TYPABLE_STARTING_LINE > LINE_NUMBER_TYPE_MAX)
internal_error("%s\n"
"is too high to be represented internally",
macro_name);
if (DEFAULT_TYPABLE_STARTING_LINE < MIN_LINE_NUMBER)
internal_error("%s\n"
"is below the minimum possible BASIC line number",
macro_name);
if (DEFAULT_TYPABLE_STARTING_LINE > MAX_LINE_NUMBER)
internal_error("%s\n"
"is above the maximum possible BASIC line number",
macro_name);
}
static void
check_maximum_starting_line(void)
{
const char macro_name[] = "MAXIMUM_STARTING_LINE";
if (MAXIMUM_STARTING_LINE < LINE_NUMBER_TYPE_MIN)
internal_error("%s\n"
"is too low to be represented internally",
macro_name);
if (MAXIMUM_STARTING_LINE > LINE_NUMBER_TYPE_MAX)
internal_error("%s\n"
"is too high to be represented internally",
macro_name);
if (MAXIMUM_STARTING_LINE > ULONG_MAX)
internal_error("In get_line_number(), %s\n"
"cannot be safely converted to unsigned long",
macro_name);
if (MAXIMUM_STARTING_LINE < MIN_LINE_NUMBER)
internal_error("%s\n"
"is below the minimum possible BASIC line number",
macro_name);
if (MAXIMUM_STARTING_LINE > MAX_LINE_NUMBER)
internal_error("%s\n"
"is above the maximum possible BASIC line number",
macro_name);
}
static void
check_default_step(void)
{
const char macro_name[] = "DEFAULT_STEP";
if (DEFAULT_STEP < MINIMUM_STEP)
internal_error("%s must be at least %u",
macro_name,
MINIMUM_STEP);
if (DEFAULT_STEP > LINE_NUMBER_STEP_TYPE_MAX)
internal_error("%s cannot be operated on internally",
macro_name);
}
static void
check_default_typable_step(void)
{
const char macro_name[] = "DEFAULT_TYPABLE_STEP";
if (DEFAULT_TYPABLE_STEP < MINIMUM_STEP)
internal_error("%s must be at least %u",
macro_name,
MINIMUM_STEP);
if (DEFAULT_TYPABLE_STEP > LINE_NUMBER_STEP_TYPE_MAX)
internal_error("%s cannot be operated on internally",
macro_name);
}
static void
check_maximum_step(void)
{
const char macro_name[] = "MAXIMUM_STEP";
if (MAXIMUM_STEP < MINIMUM_STEP)
internal_error("%s must be at least %u",
macro_name,
MINIMUM_STEP);
if (MAXIMUM_STEP > ULONG_MAX)
internal_error("%s cannot be operated on internally\n"
"in get_line_number_step()",
macro_name);
if (MAXIMUM_STEP > LINE_NUMBER_STEP_TYPE_MAX)
internal_error("%s cannot be operated on internally",
macro_name);
}
static void
check_maximum_line_count(void)
{
const char macro_name[] = "MAXIMUM_LINE_COUNT";
if (MAXIMUM_LINE_COUNT < MINIMUM_MAXIMUM_LINE_COUNT)
internal_error("%s is too low",
macro_name);
if (MAXIMUM_LINE_COUNT > LINE_COUNTER_TYPE_MAX)
internal_error("%s cannot be operated on internally",
macro_name);
}
static void
check_maximum_line_length(void)
{
const char macro_name[] = "MAXIMUM_LINE_LENGTH";
if (MAXIMUM_LINE_LENGTH < MINIMUM_MAXIMUM_LINE_LENGTH)
internal_error("%s is too low",
macro_name);
}
static void
check_maximum_checksummed_data_per_line()
{
const char macro_name[] = "MAXIMUM_CHECKSUMMED_DATA_PER_LINE";
if (MAXIMUM_CHECKSUMMED_DATA_PER_LINE
< MINIMUM_CHECKSUMMED_DATA_PER_LINE)
internal_error("%s must be at least %d",
macro_name,
MINIMUM_CHECKSUMMED_DATA_PER_LINE);
if (MAXIMUM_CHECKSUMMED_DATA_PER_LINE > USHRT_MAX)
internal_error("%s cannot be represented internally",
macro_name);
}
static void
check_maximum_basic_program_size(void)
{
const char macro_name[] = "MAXIMUM_BASIC_PROGRAM_SIZE";
if (MAXIMUM_BASIC_PROGRAM_SIZE
< MINIMUM_MAXIMUM_BASIC_PROGRAM_SIZE)
internal_error("%s is too low",
macro_name);
if (MAXIMUM_BASIC_PROGRAM_SIZE > LONG_MAX)
internal_error("%s cannot be operated on internally",
macro_name);
}
static void
check_maximum_input_file_size(void)
{
char macro_name[] = "MAXIMUM_INPUT_FILE_SIZE";
if (MAXIMUM_INPUT_FILE_SIZE < MINIMUM_MAXIMUM_INPUT_FILE_SIZE)
internal_error("%s is too low. It should be at least %d",
macro_name,
MINIMUM_MAXIMUM_INPUT_FILE_SIZE);
if (MAXIMUM_INPUT_FILE_SIZE > LONG_MAX)
internal_error("%s cannot be operated on internally",
macro_name);
}
static void
check_maximum_binary_size(void)
{
const char macro_name[] = "MAXIMUM_BINARY_SIZE";
if (MAXIMUM_BINARY_SIZE < MINIMUM_MAXIMUM_BINARY_SIZE)
internal_error("%s is too low. It should be at least %lu",
macro_name,
(unsigned long int) MINIMUM_MAXIMUM_BINARY_SIZE);
if (MAXIMUM_BINARY_SIZE > LONG_MAX)
internal_error("%s cannot be represented internally",
macro_name);
}
static void
check_text_buffer_size(void)
{
const char macro_name[] = "TEXT_BUFFER_SIZE";
if (TEXT_BUFFER_SIZE < MINIMUM_TEXT_BUFFER_SIZE)
internal_error("%s is too low. It should be at least %u",
macro_name,
MINIMUM_TEXT_BUFFER_SIZE);
if (TEXT_BUFFER_SIZE > INT_MAX)
internal_error("%s cannot be operated on internally",
macro_name);
}
static void
check_default_starts(void)
{
if (COCO_DEFAULT_START > HIGHEST_COCO_ADDRESS)
internal_error("COCO_DEFAULT_START is higher than\n"
"is possible on the Color Computer");
if (DRAGON_DEFAULT_START > HIGHEST_DRAGON_ADDRESS)
internal_error("DRAGON_DEFAULT_START is higher than\n"
"is possible on the Dragon");
if (C64_DEFAULT_START > HIGHEST_C64_ADDRESS)
internal_error("C64_DEFAULT_START is higher than\n"
"is possible on the Commodore 64");
}
static void
error(const char *fmt, ...)
{
va_list ap;
(void) fprintf(stderr, "Error: ");
va_start(ap, fmt);
(void) vfprintf(stderr, fmt, ap);
va_end(ap);
(void) fprintf(stderr, "\n");
exit(EXIT_FAILURE);
}
static void
error_while_printing_warning(void)
{
error("Couldn't print warning to standard output");
}
static void
warning(const char *fmt, ...)
{
FILE *stream = PRINT_WARNINGS_TO_STDERR ? stderr : stdout;
va_list ap;
int vfprintf_return_value = 0;
if (fprintf(stream, "Warning: ") < 0)
error_while_printing_warning();
va_start(ap, fmt);
vfprintf_return_value = vfprintf(stream, fmt, ap);
va_end(ap);
if (vfprintf_return_value < 0)
error_while_printing_warning();
if (fprintf(stream, "\n") < 0)
error_while_printing_warning();
}
static void
xputs(const char *s)
{
if (puts(s) == EOF)
error("Couldn't print string to standard output");
}
static void
xprintf(const char *fmt, ...)
{
va_list ap;
int vprintf_return_value = 0;
va_start(ap, fmt);
vprintf_return_value = vprintf(fmt, ap);
va_end(ap);
if (vprintf_return_value < 0)
error("Couldn't print formatted string to standard output");
}
static void
print_version_text(void)
{
xputs("BASICloader (under development)");
xputs("(c) 2017 Richard Cavell");
}
static void
print_version(void)
{
print_version_text();
exit(EXIT_SUCCESS);
}
static void
print_help_text(void)
{
print_version_text();
xputs("https://github.com/richardcavell/BASICloader");
xputs("");
xputs("Usage: BASICloader [options] [filename]");
xputs("");
xputs(" -o --output Output filename");
xprintf(" -m --machine Target machine (%s/%s/%s)\n",
COCO_TEXT,
DRAGON_TEXT,
C64_TEXT);
xprintf(" -f --format Input file format (%s/%s/%s/%s)\n",
BINARY_TEXT,
RS_DOS_TEXT,
DRAGON_DOS_TEXT,
PRG_TEXT);
xprintf(" -c --case Output case (%s/%s)\n",
UPPERCASE_TEXT,
LOWERCASE_TEXT);
xputs(" -t --typable Human-readable and human-typable");
xputs(" -r --remarks Add remarks and date");
xprintf(" -x --extbas Assume Extended Color BASIC (%s only)\n",
COCO_TEXT);
xputs(" -k --checksum Calculate and use checksums");
xputs(" -s --start Start memory location");
xputs(" -e --exec Exec memory location");
xputs(" -p --print Print the BASIC program to standard output");
xputs(" -n --nowarn Turn warnings off");
xputs(" -l --license Your license to use this program");
xputs(" -i --info What this program does");
xputs(" -h --help This help information");
xputs(" -v --version Version number");
xputs(" -a --allopt Show all options");
}
static void
print_help(void)
{
print_help_text();
exit(EXIT_SUCCESS);
}
static void
print_all_options(void)
{
print_help_text();
xputs(" --defaults Print the default values for some switches");
xputs(" --line Starting line number");
xputs(" --step Line number step");
xputs(" --diag Print diagnostic information");
xputs(" --majorv Major version number");
xputs(" --minorv Minor version number");
xputs(" --stdin Read machine language file from standard input");
exit(EXIT_SUCCESS);
}
static void
print_info(void)
{
print_version_text();
xputs("");
xputs("BASICloader generates programs similar to the type-in programs");
xputs("from 1980s computer magazines.");
xputs("");
xputs("It reads in a machine language program that is intended for one");
xputs("of the target machines, and then constructs a BASIC program");
xputs("that will run on that target machine.");
xputs("");
xputs("The BASIC program will contain a loop and some DATA statements.");
xputs("When run, it will poke the machine language into memory, and");
xputs("then execute it.");
exit(EXIT_SUCCESS);
}
static void
print_license(void)
{
xputs("BASICloader License");
xputs("");
xputs("(modified MIT License)");
xputs("");
xputs("Copyright (c) 2017 Richard Cavell");
xputs("");
xputs("Permission is hereby granted, free of charge,"
" to any person obtaining a copy");
xputs("of this software and associated documentation files"
" (the \"Software\"), to deal");
xputs("in the Software without restriction, including without"
" limitation the rights");
xputs("to use, copy, modify, merge, publish, distribute,"
" sublicense, and/or sell");
xputs("copies of the Software, and to permit persons to whom"
" the Software is");
xputs("furnished to do so, subject to the following conditions:");
xputs("");
xputs("The above copyright notice and this permission notice"
" shall be included in all");
xputs("copies or substantial portions of the Software.");
xputs("");
xputs("THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY"
" OF ANY KIND, EXPRESS OR");
xputs("IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES"
" OF MERCHANTABILITY,");
xputs("FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT."
" IN NO EVENT SHALL THE");
xputs("AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,"
" DAMAGES OR OTHER");
xputs("LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR"
" OTHERWISE, ARISING FROM,");
xputs("OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE"
" OR OTHER DEALINGS IN THE");
xputs("SOFTWARE.");
xputs("");
xputs("The output of this program is licensed to you under the"
" following license:");
xputs("");
xputs("1. You may use the output of this program, for free,"
" for any worthwhile");
xputs(" or moral purpose.");
xputs("2. You should try to attribute me and the BASICloader"
" program, where");
xputs(" that is not unreasonable.");
xputs("");
xputs("You should not allow people to assume that you wrote"
" the BASIC code yourself.");
exit(EXIT_SUCCESS);
}
static const char *
architecture_to_text(enum architecture target_architecture)
{
const char *text = NULL;
switch(target_architecture)
{
case COCO: text = COCO_TEXT; break;
case DRAGON: text = DRAGON_TEXT; break;
case C64: text = C64_TEXT; break;
default: internal_error("Unhandled architecture in"
" architecture_to_text()");
}
return text;
}
static const char *
format_to_text(enum file_format format)
{
const char *text = NULL;
switch(format)
{
case BINARY: text = BINARY_TEXT; break;
case RS_DOS: text = RS_DOS_TEXT; break;
case DRAGON_DOS: text = DRAGON_DOS_TEXT; break;
case PRG: text = PRG_TEXT; break;
default: internal_error("Unhandled format in"
" format_to_text()");
}
return text;
}
static const char *
case_to_text(enum case_choice output_case)
{
const char *text = NULL;
switch(output_case)
{
case UPPERCASE: text = UPPERCASE_TEXT; break;
case LOWERCASE: text = LOWERCASE_TEXT; break;
case MIXED_CASE: text = MIXED_CASE_TEXT; break;
default: internal_error("Unhandled case in"
" case_to_text()");
}
return text;
}
static void
print_defaults(void)
{
xprintf("Output filename : \"%s\"\n",
DEFAULT_OUTPUT_FILENAME);
xprintf(" \"%s\""
" (with --machine %s --case %s)\n",
DEFAULT_C64LC_OUTPUT_FILENAME,
C64_TEXT,
LOWERCASE_TEXT);
xprintf("Target machine : %s\n",
architecture_to_text(DEFAULT_ARCHITECTURE));
xprintf("Input file format : %s\n",
format_to_text(DEFAULT_INPUT_FILE_FORMAT));
xprintf("Output case : %s\n",
case_to_text(DEFAULT_OUTPUT_CASE));
xprintf("Start location : Hex=0x%lx Dec=%lu (%s)\n",
(unsigned long int) COCO_DEFAULT_START,
(unsigned long int) COCO_DEFAULT_START,
COCO_TEXT);
xprintf(" : Hex=0x%lx Dec=%lu (%s)\n",
(unsigned long int) DRAGON_DEFAULT_START,
(unsigned long int) DRAGON_DEFAULT_START,
DRAGON_TEXT);
xprintf(" : Hex=0x%lx Dec=%lu (%s)\n",
(unsigned long int) C64_DEFAULT_START,
(unsigned long int) C64_DEFAULT_START,
C64_TEXT);
xputs("Exec location : (Equal to start location)");
xprintf("Starting line : %lu\n",
(unsigned long int) DEFAULT_STARTING_LINE);
xprintf(" : %lu (with --typable)\n",
(unsigned long int) DEFAULT_TYPABLE_STARTING_LINE);
xprintf("Starting step : %lu\n",
(unsigned long int) DEFAULT_STEP);
xprintf(" : %lu (with --typable)\n",
(unsigned long int) DEFAULT_TYPABLE_STEP);
exit(EXIT_SUCCESS);
}
static boolean_type
string_match(const char *actual_arg,
const char *option_text)
{
return actual_arg != NULL &&
option_text != NULL &&
strcmp(actual_arg, option_text) == 0;
}
static boolean_type
arg2_match(const char *arg_text,
const char *short_option_text,
const char *long_option_text)
{
return string_match(arg_text, short_option_text) ||
string_match(arg_text, long_option_text);
}
static int
is_option(const char *arg)
{
const char dash = '-';
return arg[0] == dash;
}
static const char *
get_output_filename(const char *arg1,
const char *arg2,
const char *output_filename)
{
if (output_filename != NULL)
error("You can only set option %s once", arg1);
if (arg2 == NULL)
error("You must supply a filename after %s", arg1);
return arg2;
}
static enum architecture
get_target_architecture(const char *arg1,
const char *arg2,
enum architecture target_architecture)
{
if (target_architecture != NO_ARCHITECTURE_CHOSEN)
error("You can only set %s once", arg1);
if (arg2 == NULL)
error("You must name a machine after %s", arg1);
if (string_match(arg2, COCO_TEXT)) target_architecture = COCO;
else if (string_match(arg2, DRAGON_TEXT)) target_architecture = DRAGON;
else if (string_match(arg2, C64_TEXT)) target_architecture = C64;
else error("Unknown target architecture \"%s\"", arg2);
return target_architecture;
}
static enum file_format
get_format(const char *arg1,
const char *arg2,
enum file_format format)
{
if (format != NO_FILE_FORMAT_CHOSEN)
error("You can only set %s once", arg1);
if (arg2 == NULL)
error("You must name a file format after %s", arg1);
if (string_match(arg2, BINARY_TEXT)) format = BINARY;
else if (string_match(arg2, RS_DOS_TEXT)) format = RS_DOS;
else if (string_match(arg2, DRAGON_DOS_TEXT)) format = DRAGON_DOS;
else if (string_match(arg2, PRG_TEXT)) format = PRG;
else error("Unknown file format \"%s\"", arg2);
return format;
}
static enum case_choice
get_case(const char *arg1,
const char *arg2,
enum case_choice output_case)
{
if (output_case != NO_CASE_CHOSEN)
error("You can only set %s once", arg1);
if (arg2 == NULL)
error("You must name a case choice after %s", arg1);
if (string_match(arg2, UPPERCASE_TEXT)) output_case = UPPERCASE;
else if (string_match(arg2, LOWERCASE_TEXT)) output_case = LOWERCASE;
else if (string_match(arg2, MIXED_CASE_TEXT)) output_case = MIXED_CASE;
else error("Unknown case \"%s\"", arg2);
return output_case;
}
static boolean_type
get_switch_state(const char *arg,
boolean_type sw)
{
if (sw != 0)
error("Option %s has already been set", arg);
sw = 1;
return sw;
}
static unsigned long int
arg_to_unsigned_long(const char *pstring,
boolean_type *ok,
unsigned long int min,
unsigned long int max)
{
unsigned long int l = 0;
char *endptr = NULL;
int base = 0;
errno = 0;
if (pstring != NULL)
while (*pstring == ' ')
++pstring;
if (pstring != NULL && pstring[0] == '$')
{
base = 16;
++pstring;
}
else
base = 0;
if (pstring != NULL)
l = strtoul(pstring, &endptr, base);
*ok = ( pstring != NULL
&& *pstring != '\0'
&& endptr != NULL
&& *endptr == '\0'
&& errno == 0
&& pstring[0] != '-'
&& l >= min
&& l <= max );
return l;
}
static line_number_type
get_line_number(const char *arg1,
const char *arg2,
line_number_type line_number,
boolean_type *line_set)
{
boolean_type ok = 0;
if (*line_set != 0)
error("Option %s can only be set once", arg1);
line_number = (line_number_type)
arg_to_unsigned_long(arg2,
&ok,
MIN_LINE_NUMBER,
MAXIMUM_STARTING_LINE);
if (ok == 0)
error("%s takes a number from %i to %lu",
arg1,
(signed int) MIN_LINE_NUMBER,
(unsigned long int) MAXIMUM_STARTING_LINE);
*line_set = 1;
return line_number;
}
static line_number_step_type
get_line_number_step(const char *arg1,
const char *arg2,
line_number_step_type step,
boolean_type *step_set)
{
boolean_type ok = 0;
if (*step_set != 0)
error("Option %s can only be set once", arg1);
step = (line_number_step_type)
arg_to_unsigned_long(arg2,
&ok,
MINIMUM_STEP,
MAXIMUM_STEP);
if (ok == 0)
error("%s takes a number from %lu to %lu",