/* $XConsortium: ParseGeom.c,v 11.19 94/04/17 20:20:23 rws Exp $ */

/*

Copyright (c) 1985, 1986, 1987  X Consortium

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from the X Consortium.

*/

#include "Xlibint.h"
#include "Xutil.h"

#ifdef notdef
/* 
 *Returns pointer to first char ins search which is also in what, else NULL.
 */
static char *strscan (search, what)
char *search, *what;
{
	int i, len = strlen (what);
	char c;

	while ((c = *(search++)) != NULL)
		for (i = 0; i < len; i++)
			if (c == what [i])
				return (--search);
	return (NULL);
}
#endif

/*
 *    XParseGeometry parses strings of the form
 *   "=<width>x<height>{+-}<xoffset>{+-}<yoffset>", where
 *   width, height, xoffset, and yoffset are unsigned integers.
 *   Example:  "=80x24+300-49"
 *   The equal sign is optional.
 *   It returns a bitmask that indicates which of the four values
 *   were actually found in the string.  For each value found,
 *   the corresponding argument is updated;  for each value
 *   not found, the corresponding argument is left unchanged. 
 */

static int
ReadInteger(string, NextString)
register char *string;
char **NextString;
{
    register int Result = 0;
    int Sign = 1;
    
    if (*string == '+')
	string++;
    else if (*string == '-')
    {
	string++;
	Sign = -1;
    }
    for (; (*string >= '0') && (*string <= '9'); string++)
    {
	Result = (Result * 10) + (*string - '0');
    }
    *NextString = string;
    if (Sign >= 0)
	return (Result);
    else
	return (-Result);
}

#if NeedFunctionPrototypes
int XParseGeometry (
_Xconst char *string,
int *x,
int *y,
unsigned int *width,    /* RETURN */
unsigned int *height)    /* RETURN */
#else
int XParseGeometry (string, x, y, width, height)
char *string;
int *x, *y;
unsigned int *width, *height;    /* RETURN */
#endif
{
	int mask = NoValue;
	register char *strind;
	unsigned int tempWidth, tempHeight;
	int tempX, tempY;
	char *nextCharacter;

	if ( (string == NULL) || (*string == '\0')) return(mask);
	if (*string == '=')
		string++;  /* ignore possible '=' at beg of geometry spec */

	strind = (char *)string;
	if (*strind != '+' && *strind != '-' && *strind != 'x') {
		tempWidth = ReadInteger(strind, &nextCharacter);
		if (strind == nextCharacter) 
		    return (0);
		strind = nextCharacter;
		mask |= WidthValue;
	}

	if (*strind == 'x' || *strind == 'X') {	
		strind++;
		tempHeight = ReadInteger(strind, &nextCharacter);
		if (strind == nextCharacter)
		    return (0);
		strind = nextCharacter;
		mask |= HeightValue;
	}

	if ((*strind == '+') || (*strind == '-')) {
		if (*strind == '-') {
  			strind++;
			tempX = -ReadInteger(strind, &nextCharacter);
			if (strind == nextCharacter)
			    return (0);
			strind = nextCharacter;
			mask |= XNegative;

		}
		else
		{	strind++;
			tempX = ReadInteger(strind, &nextCharacter);
			if (strind == nextCharacter)
			    return(0);
			strind = nextCharacter;
		}
		mask |= XValue;
		if ((*strind == '+') || (*strind == '-')) {
			if (*strind == '-') {
				strind++;
				tempY = -ReadInteger(strind, &nextCharacter);
				if (strind == nextCharacter)
			    	    return(0);
				strind = nextCharacter;
				mask |= YNegative;

			}
			else
			{
				strind++;
				tempY = ReadInteger(strind, &nextCharacter);
				if (strind == nextCharacter)
			    	    return(0);
				strind = nextCharacter;
			}
			mask |= YValue;
		}
	}
	
	/* If strind isn't at the end of the string the it's an invalid
		geometry specification. */

	if (*strind != '\0') return (0);

	if (mask & XValue)
	    *x = tempX;
 	if (mask & YValue)
	    *y = tempY;
	if (mask & WidthValue)
            *width = tempWidth;
	if (mask & HeightValue)
            *height = tempHeight;
	return (mask);
}
