/* Copyright (C) 1998 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
  to anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer
  to the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given
  to you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
*/

/*$RCSfile: gendev.c,v $ $Revision: 1.2.2.1 $ */
/* Generate .dev configuration files */
#include "stdpre.h"
#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>		/* for calloc */
#include <string.h>

/*
 * This program generates .dev configuration files.
 *
 * Usage:
 *      gendev [-Z] [-n [<name_prefix> | -]] [-C [<dir> | -]]
 *        (-d <devfile> | -m <modfile> | -a <modfile>)
 *        (-<category> | <item>)*
 *
 * The name_prefix is for device[2], font, init, and iodev resources.
 * ****** DOESN'T HANDLE -replace YET ******
 * ****** DOESN'T MERGE device AND device2 ******
 */

#define DEFAULT_NAME_PREFIX "gs_"
#define INITIAL_CATEGORY "obj"

typedef struct config_s {
    /* Set once */
    FILE *out;
    bool debug;
    const char *name_prefix;
    const char *file_prefix;
    ulong file_id;		/* for uniq_last detection */
    /* Updated dynamically */
#define ITEM_ID_BITS 5
    uint item_id;
    bool any_scan_items;
    bool in_res_scan;
    bool in_category;		/* in_category implies in_res_scan */
    const char *current_category;
} config;
static const config init_config =
{
    0,				/* out */
    0,				/* debug */
    DEFAULT_NAME_PREFIX,	/* name_prefix */
    "",				/* file_prefix */
    0,				/* file_id */
    0,				/* item_id */
    0,				/* any_scan_items */
    0,				/* in_res_scan */
    0,				/* in_category */
    ""				/* current_category */
};

static const char *indent_INCLUDED = "\t\t\t\t";
static const char *indent_RES_SCAN = "   ";
static const char *indent_category = "\t";
static const char *indent_SEEN = "\t    ";
static const char *indent_include = "   ";
static const char *indent_scan_item = "\t";
static const char *indent_item = "";

/* Forward definitions */
void add_entry(P4(config *, const char *, const char *, bool));

main(int argc, char *argv[])
{
    config conf;
    int i, j;
    bool dev, append;
    const char *category = INITIAL_CATEGORY;
    const char *fnarg;
    FILE *out;
    long pos;

    conf = init_config;
    /* Process command line arguments. */
    for (i = 1; i < argc; i++) {
	const char *arg = argv[i];

	if (*arg != '-') {
	    fprintf(stderr, "-d|m|a must precede non-switches.\n", arg);
	    exit(1);
	}
	switch (arg[1]) {
	    case 'C':		/* change directory, by analogy with make */
		conf.file_prefix =
		    (argv[i + 1][0] == '-' ? "" : argv[i + 1]);
		++i;
		continue;
	    case 'n':
		conf.name_prefix =
		    (argv[i + 1][0] == '-' ? "" : argv[i + 1]);
		++i;
		continue;
	    case 'a':
		dev = false, append = true;
		break;
	    case 'd':
		dev = true, append = false;
		break;
	    case 'm':
		dev = false, append = false;
		break;
	    case 'Z':
		conf.debug = true;
		continue;
	    default:
		fprintf(stderr, "Unknown switch %s.\n", argv[i]);
		exit(1);
	}
	break;
    }
    if (i == argc - 1) {
	fprintf(stderr, "No output file name given, last argument is %s.\n",
		argv[i]);
	exit(1);
    }
    /* Must be the output file. */
    fnarg = argv[++i];
    {
	char fname[100];

	strcpy(fname, fnarg);
	strcat(fname, ".dev");
	out = fopen(fname, (append ? "a" : "w"));
	if (out == 0) {
	    fprintf(stderr, "Can't open %s for output.\n", fname);
	    exit(1);
	}
	if (!append)
	    fprintf(out,
		    "/*\n * File %s created automatically by gendev.\n */\n",
		    fname);
    }
    conf.out = out;
    pos = ftell(out);
    /* We need a separate _INCLUDED flag for each batch of definitions. */
    fprintf(out, "\n#%sifndef %s_%ld_INCLUDED\n",
	    indent_INCLUDED, fnarg, pos);
    fprintf(out, "#%s  define %s_%ld_INCLUDED\n",
	    indent_INCLUDED, fnarg, pos);
    /* Create a "unique" hash for the output file. */
    for (j = 0; fnarg[j] != 0; ++j)
	conf.file_id = conf.file_id * 41 + fnarg[j];
    conf.item_id <<= ITEM_ID_BITS;
    /* Add the real entries. */
    if (dev)
	add_entry(&conf, "dev", fnarg, false);
    for (j = i + 1; j < argc; ++j) {
	const char *arg = argv[j];

	if (arg[0] == '-')
	    category = arg + 1;
	else
	    add_entry(&conf, category, arg, false);
    }
    if (conf.in_category)
	fprintf(out, "#%sendif /* -%s */\n",
		indent_category, conf.current_category);
    /* Add the scanning entries, if any. */
    if (conf.any_scan_items) {
	if (conf.in_res_scan)
	    fprintf(out, "#%selse /* RES_SCAN */\n", indent_RES_SCAN);
	else
	    fprintf(out, "#%sifdef RES_SCAN\n", indent_RES_SCAN);
	conf.in_res_scan = true;
	category = INITIAL_CATEGORY;
	conf.item_id = 0;
	for (j = i + 1; j < argc; ++j) {
	    const char *arg = argv[j];

	    if (arg[0] == '-')
		category = arg + 1;
	    else
		add_entry(&conf, category, arg, true);
	}
    }
    if (conf.in_res_scan)
	fprintf(out, "#%sendif /* RES_SCAN */\n", indent_RES_SCAN);
    fprintf(out, "#%sendif /* !%s_%ld_INCLUDED */\n",
	    indent_INCLUDED, fnarg, pos);
    fclose(out);
    exit(0);
}

/* Add an entry to the output. */
typedef enum {
    uniq_none = 0,
    uniq_first,
    uniq_last
} uniq_mode;
void
write_item(config * pconf, const char *str, const char *category,
	   const char *item, uniq_mode mode)
{
    FILE *out = pconf->out;
    char cati[80];

    if (!pconf->in_res_scan) {
	fprintf(out, "#%sifndef RES_SCAN\n", indent_RES_SCAN);
	pconf->in_res_scan = true;
    }
    if (strcmp(pconf->current_category, category)) {
	const char *paren = strchr(str, '(');

	if (pconf->in_category)
	    fprintf(out, "#%sendif /* -%s */\n",
		    indent_category, pconf->current_category);
	fprintf(out, "#%sifdef ", indent_category);
	fwrite(str, sizeof(char), paren - str, out);

	fprintf(out, "\n");
	pconf->current_category = category;
	pconf->in_category = true;
    }
    sprintf(cati, "%s_%s_", category, item);
    switch (mode) {
	case uniq_none:
	    fprintf(out, "%s%s\n", indent_item, str);
	    break;
	case uniq_first:
	    fprintf(out, "#%sifndef %sSEEN\n", indent_SEEN, cati);
	    fprintf(out, "#%s  define %sSEEN\n", indent_SEEN, cati);
	    write_item(pconf, str, category, item, uniq_none);
	    fprintf(out, "#%sendif\n", indent_SEEN, cati);
	    break;
	case uniq_last:
	    fprintf(out, "#%sif %sSEEN == %lu\n", indent_SEEN, cati,
		    pconf->file_id + pconf->item_id++);
	    write_item(pconf, str, category, item, uniq_none);
	    fprintf(out, "#%sendif\n", indent_SEEN, cati);
	    pconf->any_scan_items = true;
	    break;
    }
}
void
write_scan_item(config * pconf, const char *str, const char *category,
		const char *item, uniq_mode mode)
{
    FILE *out = pconf->out;
    char cati[80];

    sprintf(cati, "%s_%s_", category, item);
    switch (mode) {
	case uniq_none:
	    break;
	case uniq_first:
	    break;
	case uniq_last:
	    fprintf(out, "#%sundef %sSEEN\n", indent_scan_item, cati);
	    fprintf(out, "#%s  define %sSEEN %lu\n", indent_scan_item, cati,
		    pconf->file_id + pconf->item_id++);
    }
}
void
add_entry(config * pconf, const char *category, const char *item, bool scan)
{
    char str[80];
    uniq_mode mode = uniq_first;

    if (pconf->debug && !scan)
	printf("Adding %s %s;\n", category, item);
    str[0] = 0;
    switch (category[0]) {	/* just an accelerator */
#define is_cat(str) !strcmp(category, str)
	case 'd':
	    if (is_cat("dev"))
		sprintf(str, "device_(%s%s_device)\n",
			pconf->name_prefix, item);
	    else if (is_cat("dev2"))
		sprintf(str, "device2_(%s%s_device)\n",
			pconf->name_prefix, item);
	    break;
	case 'e':
	    if (is_cat("emulator"))
		sprintf(str, "emulator_(\"%s\",%d)",
			item, strlen(item));
	    break;
	case 'f':
	    if (is_cat("font"))
		sprintf(str, "font_(\"0.font_%s\",%sf_%s,zf_%s)",
			item, pconf->name_prefix, item, item);
	    break;
	case 'i':
	    if (is_cat("include")) {
		int len = strlen(item);

		if (scan)
		    return;
		if (strcmp(pconf->current_category, category)) {
		    if (pconf->in_category) {
			fprintf(pconf->out, "#%sendif /* -%s */\n",
				indent_category, pconf->current_category);
			pconf->in_category = false;
		    }
		    pconf->current_category = category;
		}
		if (pconf->in_res_scan) {
		    fprintf(pconf->out, "#%sendif /* RES_SCAN */\n",
			    indent_RES_SCAN);
		    pconf->in_res_scan = false;
		}
		if (len < 5 || strcmp(item + len - 4, ".dev"))
		    fprintf(pconf->out, "#%sinclude \"%s.dev\"\n",
			    indent_include, item);
		else
		    fprintf(pconf->out, "#%sinclude \"%s\"\n",
			    indent_include, item);
		return;
	    } else if (is_cat("init"))
		sprintf(str, "init_(%s%s_init)", pconf->name_prefix, item);
	    else if (is_cat("iodev"))
		sprintf(str, "io_device_(%siodev_%s)", pconf->name_prefix, item);
	    break;
	case 'l':
	    if (is_cat("lib")) {
		sprintf(str, "lib_(%s)", item);
		mode = uniq_last;
	    }
	    break;
	case 'o':
	    if (is_cat("obj"))
		sprintf(str, "obj_(%s%s)", pconf->file_prefix, item);
	    else if (is_cat("oper"))
		sprintf(str, "oper_(%s_op_defs)", item);
	    break;
	case 'p':
	    if (is_cat("ps"))
		sprintf(str, "psfile_(\"%s.ps\",%d)",
			item, strlen(item) + 3);
	    break;
#undef is_cat
	default:
	    ;
    }
    if (str[0] == 0) {
	fprintf(stderr, "Unknown category %s.\n", category);
	exit(1);
    }
    if (scan)
	write_scan_item(pconf, str, category, item, mode);
    else
	write_item(pconf, str, category, item, mode);
}
