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/*
* Copyright (C) 2006-2007 Michael Buesch <mb@bu3sch.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*/
#include "args.h"
#include "main.h"
#include "util.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
int _debug;
bool arg_print_sizes;
const char *initvals_fn_extension = ".initvals";
static const char *real_infile_name;
#define ARG_MATCH 0
#define ARG_NOMATCH 1
#define ARG_ERROR -1
static int do_cmp_arg(char **argv, int *pos,
const char *template,
int allow_merged,
const char **param)
{
char *arg;
char *next_arg;
size_t arg_len, template_len;
arg = argv[*pos];
next_arg = argv[*pos + 1];
arg_len = strlen(arg);
template_len = strlen(template);
if (param) {
/* Maybe we have a merged parameter here.
* A merged parameter is "-pfoobar" for example.
*/
if (allow_merged && arg_len > template_len) {
if (memcmp(arg, template, template_len) == 0) {
*param = arg + template_len;
return ARG_MATCH;
}
return ARG_NOMATCH;
} else if (arg_len != template_len)
return ARG_NOMATCH;
*param = next_arg;
}
if (strcmp(arg, template) == 0) {
if (param) {
/* Skip the parameter on the next iteration. */
(*pos)++;
if (*param == NULL) {
fprintf(stderr, "%s needs a parameter\n", arg);
return ARG_ERROR;
}
}
return ARG_MATCH;
}
return ARG_NOMATCH;
}
/* Simple and lean command line argument parsing. */
static int cmp_arg(char **argv, int *pos,
const char *long_template,
const char *short_template,
const char **param)
{
int err;
if (long_template) {
err = do_cmp_arg(argv, pos, long_template, 0, param);
if (err == ARG_MATCH || err == ARG_ERROR)
return err;
}
err = ARG_NOMATCH;
if (short_template)
err = do_cmp_arg(argv, pos, short_template, 1, param);
return err;
}
static void usage(int argc, char **argv)
{
printf("Usage: %s INPUT_FILE OUTPUT_FILE [OPTIONS]\n", argv[0]);
printf(" -h|--help Print this help\n");
printf(" -d|--debug Print verbose debugging info\n");
printf(" Repeat for more verbose debugging\n");
printf(" -s|--psize Print the size of the code after assembling\n");
printf(" -e|--ivalext EXT Filename extension for the initvals\n");
}
int parse_args(int argc, char **argv)
{
int i;
int res;
if (argc < 3)
goto out_usage;
infile_name = argv[1];
outfile_name = argv[2];
for (i = 3; i < argc; i++) {
if ((res = cmp_arg(argv, &i, "--help", "-h", NULL)) == ARG_MATCH) {
usage(argc, argv);
return 1;
} else if ((res = cmp_arg(argv, &i, "--debug", "-d", NULL)) == ARG_MATCH) {
_debug++;
} else if ((res = cmp_arg(argv, &i, "--psize", "-s", NULL)) == ARG_MATCH) {
arg_print_sizes = 1;
} else if ((res = cmp_arg(argv, &i, "--ivalext", "-e", &initvals_fn_extension)) == ARG_MATCH) {
/* initvals_fn_extension is set to the extension. */
} else if ((res = cmp_arg(argv, &i, "--__real_infile", NULL, &real_infile_name)) == ARG_MATCH) {
/* real_infile_name is set. */
} else {
fprintf(stderr, "Unrecognized argument: %s\n", argv[i]);
goto out_usage;
}
}
if (!real_infile_name)
real_infile_name = infile_name;
if (strcmp(real_infile_name, outfile_name) == 0) {
fprintf(stderr, "Error: INPUT and OUTPUT filename must not be the same\n");
goto out_usage;
}
return 0;
out_usage:
usage(argc, argv);
return -1;
}
int open_input_file(void)
{
int fd;
int err;
if (strcmp(infile_name, "-") == 0) {
/* infile == stdin */
fd = STDIN_FILENO;
} else {
fd = open(infile_name, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Could not open INPUT_FILE %s\n",
infile_name);
return -1;
}
err = dup2(fd, STDIN_FILENO);
if (err) {
fprintf(stderr, "Could not dup INPUT_FILE %s "
"to STDIN\n", infile_name);
close(fd);
return -1;
}
}
infile.fd = fd;
return 0;
}
void close_input_file(void)
{
if (strcmp(infile_name, "-") != 0)
close(infile.fd);
}
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