/*  ibicc - The Ibi C Compiler
    Copyright (C) 2004 Antti-Juhani Kaijanaho

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above
       copyright notice, this list of conditions and the following
       disclaimer in the documentation and/or other materials provided
       with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
    OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
    GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
    WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define _XOPEN_SOURCE 600

#include "diag.h"
#include "ibicpp.h"
#include "paths.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

static int print_defs = 0;

static void help(char *prog)
{
	fprintf(stderr,
		"Usage: %s {-Dname|-Dname=value|-Idir|-I-|-Uname|-undef} input output\n",
		prog);
}

struct symdef {
	char *sym;
	char *def;
	struct symdef *next;
};

static void preprocess(char const *inf, char const *outf, struct symdef * sdefs)
{
	struct symdef *old_sdef = 0;
	ibicpp_source_t is = ibicpp_open_source(inf);
	struct ibicpp_token buf[2048];
	size_t toks, i;
	FILE *fp = fopen(outf, "w");

	if (is == 0) exit(1);
	if (fp == 0) {
		fprintf(stderr, "cannot open output file\n");
		exit(1);
	}
	
	ibicpp_append_system_include_dir(is, "/usr/local/include");
	ibicpp_append_system_include_dir(is, "/usr/include");
	ibicpp_append_system_include_dir(is, OWN_INCLUDE_DIR);

	for (; sdefs != 0; old_sdef = sdefs, sdefs = old_sdef->next) {
		free(old_sdef);
		ibicpp_define_symbol(is, sdefs->sym, sdefs->def, "<command line>");
		free(sdefs->sym);
	}


	for (i = 0; i < sizeof buf / sizeof *buf; i++) {
		buf[i].semval = empty_substr;
	}

	while (1) {
		toks = ibicpp_get_tokens(is, buf, 0, sizeof buf / sizeof *buf);
		if (toks == 0) break;
		ibicpp_token_print(fp, buf, 0, toks);
	}
	if (print_defs) ibicpp_dump_macros(stdout, is);
	ibicpp_close_source(is);
	fclose(fp);
}

int main(const int argc, char **argv)
{
	int argi = 1;
	int error = 0;
	char *inf = 0, *outf = 0;
	struct symdef *sdefs = 0;
	while (argi < argc && argv[argi][0] == '-') {
		char *optarg = 0;
		switch (argv[argi][1]) {
		case 'd':
			if (strcmp(argv[argi], "-defs") != 0) goto unrecognized_option;
			print_defs = 1;
			break;
		case 'D':
		{
			struct symdef *sd = malloc(sizeof *sd);
			if (sd == 0) enomem();
			if (argv[argi][2] == 0) {
				optarg = argv[++argi];
			} else {
				optarg = argv[argi] + 1;
			}
			sd->sym = strdup(optarg);
			if (sd->sym == 0) enomem();
			sd->def = strchr(sd->sym, '=');
			if (sd->def == 0) {
				sd->def = "1";
			} else {
				if (sd->def == sd->sym) {
					fprintf(stderr, "%s: -D argument syntax error\n",
						argv[0]);
					error = 1;
					break;
				}
				*sd->def = '\0';
				++sd->def;
			}
			sd->next = sdefs;
			sdefs = sd;
			break;
		}
		case 'I':
			fprintf(stderr, "%s: ignoring -I (not implemented)\n", argv[0]);
			if (argv[argi][2] == 0) ++argi;
			break;
		case 'U':
			fprintf(stderr, "%s: ignoring -U (not implemented)\n", argv[0]);
			if (argv[argi][2] == 0) ++argi;
			break;
		case 'u':
			if (strcmp(argv[argi], "-undef") != 0) goto unrecognized_option;
			fprintf(stderr, "%s: ignoring -undef (not implemented)\n",
				argv[0]);
			break;
		case 'M':
			fprintf(stderr, "%s: ignoring -M (not implemented)\n", argv[0]);
			break;
		default:
			goto unrecognized_option;
		}
		++argi;
		continue;

	unrecognized_option:
		fprintf(stderr, "%s: option '%s' unrecognized\n", argv[0], argv[argi]);
		error = 1;
		++argi;
	}

	if (argi < argc) {
		inf = argv[argi++];
	} else {
		fprintf(stderr, "%s: input file name required\n", argv[0]);
		error = 1;
	}

	if (argi < argc) {
		outf = argv[argi++];
	} else {
		fprintf(stderr, "%s: output file name required\n", argv[0]);
		error = 1;
	}

	if (argi < argc) {
		fprintf(stderr, "%s: trailing arguments on command line\n", argv[0]);
		error = 1;
	}
	
	if (error) {
		help(argv[0]);
		return 1;
	}

	preprocess(inf, outf, sdefs);
	/*for (;;);*/

	return 0;
}