/*  propfile.c, Copyright (c) 2008 Michael C. Martin */

/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope thta it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  Se the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "libs/log.h"
#include "propfile.h"
#include "libs/reslib.h"

void
PropFile_from_string (char *d, PROPERTY_HANDLER handler, const char *prefix)
{
	int len, i;

	len = strlen(d);
	i = 0;
	while (i < len) {
		int key_start, key_end, value_start, value_end;
		/* Starting a line: search for non-whitespace */
		while ((i < len) && isspace (d[i])) i++;
		if (i >= len) break;  /* Done parsing! */
		/* If it was a comment, skip to end of comment/file */
		if (d[i] == '#') {
			while ((i < len) && (d[i] != '\n')) i++;
			if (i >= len) break;
			continue; /* Back to keyword search */
		}
		key_start = i;
		/* Find the = on this line */
		while ((i < len) && (d[i] != '=') &&
		       (d[i] != '\n') && (d[i] != '#')) i++;
		if (i >= len) {  /* Bare key at EOF */
			log_add (log_Warning, "Warning: Bare keyword at EOF");
			break;
		}
		/* Comments here mean incomplete line too */
		if (d[i] != '=') {
			log_add (log_Warning, "Warning: Key without value");
			while ((i < len) && (d[i] != '\n')) i++;
			if (i >= len) break;
			continue; /* Back to keyword search */
		}
		/* Key ends at first whitespace before = , or at key_start*/
		key_end = i;
		while ((key_end > key_start) && isspace (d[key_end-1]))
			key_end--;
		
		/* Consume the = */
		i++;
		/* Value starts at first non-whitespace after = on line... */
		while ((i < len) && (d[i] != '#') && (d[i] != '\n') &&
		       isspace (d[i]))
			i++;
		value_start = i;
		/* Until first non-whitespace before terminator */
		while ((i < len) && (d[i] != '#') && (d[i] != '\n'))
			i++;
		value_end = i;
		while ((value_end > value_start) && isspace (d[value_end-1]))
			value_end--;
		/* Skip past EOL or EOF */
		while ((i < len) && (d[i] != '\n'))
			i++;
		i++;

		/* We now have start and end values for key and value.
		   We terminate the strings for both by writing \0s, then
		   make a new map entry. */
		d[key_end] = '\0';
		d[value_end] = '\0';
		if (prefix) {
			char buf[256];
			snprintf(buf, 255, "%s%s", prefix, d+key_start);
			buf[255]=0;
			handler(buf, d+value_start);
		} else {
			handler (d+key_start, d+value_start);
		}
	}
}

void
PropFile_from_file (uio_Stream *f, PROPERTY_HANDLER handler, const char *prefix)
{
	size_t flen;
	char *data;

	flen = LengthResFile (f);

	data = malloc (flen + 1);
	if (!data) {
		return;
	}

	// We may end up with less bytes than we asked for due to the
	// DOS->Unix newline conversion
	flen = ReadResFile (data, 1, flen, f);
	data[flen] = '\0';

	PropFile_from_string (data, handler, prefix);
	free (data);
}

void
PropFile_from_filename (uio_DirHandle *path, const char *fname, PROPERTY_HANDLER handler, const char *prefix)
{
	uio_Stream *f = res_OpenResFile (path, fname, "rt");
	if (!f) {
		return;
	}
	PropFile_from_file (f, handler, prefix);
	res_CloseResFile(f);
}