/* Copyright (C) 1998 Aladdin Enterprises.  All rights reserved.
  
  This file is part of AFPL Ghostscript.
  
  AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author or
  distributor accepts any responsibility for the consequences of using it, or
  for whether it serves any particular purpose or works at all, unless he or
  she says so in writing.  Refer to the Aladdin Free Public License (the
  "License") for full details.
  
  Every copy of AFPL Ghostscript must include a copy of the License, normally
  in a plain ASCII text file named PUBLIC.  The License grants you the right
  to copy, modify and redistribute AFPL Ghostscript, but only under certain
  conditions described in the License.  Among other things, the License
  requires that the copyright notice and this notice be preserved on all
  copies.
*/

/*$Id$ */
/* 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);
}