mirror of https://github.com/uffejakobsen/acme.git
106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
// ACME - a crossassembler for producing 6502/65c02/65816/65ce02 code.
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// Copyright (C) 1998-2016 Marco Baye
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// Have a look at "acme.c" for further info
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//
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// CLI argument stuff
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#include "cliargs.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include "config.h"
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// constants
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const char cliargs_error[] = "Error in CLI arguments: ";
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// variables
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static int arguments_left; // number of CLI arguments left
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static const char **next_argument; // next argument pointer
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// return pointer to next command line argument (NULL if no more)
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const char *cliargs_get_next(void)
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{
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if (arguments_left == 0)
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return NULL;
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--arguments_left;
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return *next_argument++;
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}
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// parse command line switches
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void cliargs_handle_options(char (*fn_short)(const char *), const char *(*fn_long)(const char *))
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{
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const char *problem_string,
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*argument;
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char problem_char;
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for (;;) {
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// if there are no more arguments, return immediately
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if (arguments_left == 0)
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return;
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// if next argument is not an option, return immediately
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if ((**next_argument) != '-')
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return;
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// officially fetch argument. We already know the
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// first character is a '-', so advance pointer.
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argument = cliargs_get_next() + 1;
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// Check for "--"
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if (*argument == '-') {
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// long argument
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if (argument[1] == '\0')
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return; // when encountering "--", return
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problem_string = fn_long(argument + 1);
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if (problem_string) {
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fprintf(stderr, "%sUnknown option (--%s).\n", cliargs_error, problem_string);
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exit(EXIT_FAILURE);
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}
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} else {
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problem_char = fn_short(argument);
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if (problem_char) {
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fprintf(stderr, "%sUnknown switch (-%c).\n", cliargs_error, problem_char);
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exit(EXIT_FAILURE);
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}
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}
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}
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}
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// return next arg. If there is none, complain and exit
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const char *cliargs_safe_get_next(const char name[])
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{
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const char *string;
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string = cliargs_get_next();
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if (string)
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return string;
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fprintf(stderr, "%sMissing %s.\n", cliargs_error, name);
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exit(EXIT_FAILURE);
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}
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// init command line handling stuff
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const char *cliargs_init(int argc, const char *argv[])
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{
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arguments_left = argc;
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next_argument = argv;
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return cliargs_get_next();
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}
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// return unhandled (non-option) arguments. Complains if none.
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void cliargs_get_rest(int *argc, const char ***argv, const char error[])
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{
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*argc = arguments_left;
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*argv = next_argument;
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if (error && (arguments_left == 0)) {
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fprintf(stderr, "%s%s.\n", cliargs_error, error);
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exit(EXIT_FAILURE);
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}
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}
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