FontInfo.c

/*

Copyright 1986, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

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
OPEN GROUP 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 Open Group 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 Open Group.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "Xlibint.h"
#include <limits.h>

#if defined(XF86BIGFONT)
#define USE_XF86BIGFONT
#endif
#ifdef USE_XF86BIGFONT
extern void _XF86BigfontFreeFontMetrics(
    XFontStruct*	/* fs */
);
#endif

char **XListFontsWithInfo(
register Display *dpy,
_Xconst char *pattern,  /* null-terminated */
int maxNames,
int *actualCount,	/* RETURN */
XFontStruct **info)	/* RETURN */
{
    unsigned long nbytes;
    unsigned long reply_left;	/* unused data left in reply buffer */
    register int i;
    register XFontStruct *fs;
    unsigned int size = 0;
    XFontStruct *finfo = NULL;
    char **flist = NULL;
    xListFontsWithInfoReply reply;
    register xListFontsReq *req;
    int j;

    LockDisplay(dpy);
    GetReq(ListFontsWithInfo, req);
    req->maxNames = maxNames;
    nbytes = req->nbytes = pattern ? strlen (pattern) : 0;
    req->length += (nbytes + 3) >> 2;
    _XSend (dpy, pattern, nbytes);
    /* use _XSend instead of Data, since subsequent _XReply will flush buffer */

    for (i = 0; ; i++) {
	if (!_XReply (dpy, (xReply *) &reply,
		      ((SIZEOF(xListFontsWithInfoReply) -
			SIZEOF(xGenericReply)) >> 2), xFalse)) {
	    reply.nameLength = 0; /* avoid trying to read more replies */
	    reply_left = 0;
	    goto badmem;
	}
	reply_left = reply.length -
	    ((SIZEOF(xListFontsWithInfoReply) -	SIZEOF(xGenericReply)) >> 2);
	if (reply.nameLength == 0) {
	    _XEatDataWords(dpy, reply_left);
	    break;
	}
	if (reply.nReplies >= (INT_MAX - i)) /* avoid overflowing size */
	    goto badmem;
	if ((i + reply.nReplies) >= size) {
	    size = i + reply.nReplies + 1;

	    if (size >= (INT_MAX / sizeof(XFontStruct)))
		goto badmem;

	    if (finfo) {
		XFontStruct * tmp_finfo;
		char ** tmp_flist;

		tmp_finfo = Xrealloc (finfo, sizeof(XFontStruct) * size);
		if (tmp_finfo)
		    finfo = tmp_finfo;
		else
		    goto badmem;

		tmp_flist = Xrealloc (flist, sizeof(char *) * (size+1));
		if (tmp_flist)
		    flist = tmp_flist;
		else
		    goto badmem;
	    }
	    else {
		if (! (finfo = Xmalloc(sizeof(XFontStruct) * size)))
		    goto clearwire;
		if (! (flist = Xmalloc(sizeof(char *) * (size+1)))) {
		    Xfree(finfo);
		    goto clearwire;
		}
	    }
	}
	fs = &finfo[i];

	fs->ext_data 		= NULL;
	fs->per_char		= NULL;
	fs->fid 		= None;
	fs->direction 		= reply.drawDirection;
	fs->min_char_or_byte2	= reply.minCharOrByte2;
	fs->max_char_or_byte2 	= reply.maxCharOrByte2;
	fs->min_byte1 		= reply.minByte1;
	fs->max_byte1 		= reply.maxByte1;
	fs->default_char	= reply.defaultChar;
	fs->all_chars_exist 	= reply.allCharsExist;
	fs->ascent 		= cvtINT16toInt (reply.fontAscent);
	fs->descent 		= cvtINT16toInt (reply.fontDescent);

	/* XXX the next two statements won't work if short isn't 16 bits */
	fs->min_bounds = * (XCharStruct *) &reply.minBounds;
	fs->max_bounds = * (XCharStruct *) &reply.maxBounds;

	fs->n_properties = reply.nFontProps;
	fs->properties = NULL;
	if (fs->n_properties > 0) {
	    /* nFontProps is a CARD16 */
	    nbytes = reply.nFontProps * SIZEOF(xFontProp);
	    if ((nbytes >> 2) <= reply_left) {
		size_t pbytes = reply.nFontProps * sizeof(XFontProp);
		fs->properties = Xmalloc (pbytes);
	    }
	    if (! fs->properties)
		goto badmem;
	    _XRead32 (dpy, (long *)fs->properties, nbytes);
	    reply_left -= (nbytes >> 2);
	}

	/* nameLength is a CARD8 */
	nbytes = reply.nameLength + 1;
	if (!i)
	    nbytes++; /* make first string 1 byte longer, to match XListFonts */
	flist[i] = Xmalloc (nbytes);
	if (! flist[i]) {
	    if (finfo[i].properties) Xfree(finfo[i].properties);
	    goto badmem;
	}
	if (!i) {
	    *flist[0] = 0; /* zero to distinguish from XListFonts */
	    flist[0]++;
	}
	flist[i][reply.nameLength] = '\0';
	_XReadPad (dpy, flist[i], (long) reply.nameLength);
    }
    *info = finfo;
    *actualCount = i;
    if (flist)
	flist[i] = NULL; /* required in case XFreeFontNames is called */
    UnlockDisplay(dpy);
    SyncHandle();
    return (flist);


  badmem:
    /* Free all memory allocated by this function. */
    for (j=(i-1); (j >= 0); j--) {
        if (j == 0)
            flist[j]--;         /* was incremented above */
        Xfree(flist[j]);
        if (finfo[j].properties) Xfree(finfo[j].properties);
    }
    Xfree(flist);
    Xfree(finfo);

  clearwire:
    /* Clear the wire. */
    _XEatDataWords(dpy, reply_left);
    while ((reply.nameLength != 0) &&
	   _XReply(dpy, (xReply *) &reply,
		   ((SIZEOF(xListFontsWithInfoReply) - SIZEOF(xGenericReply))
		    >> 2), xTrue));
    UnlockDisplay(dpy);
    SyncHandle();
    *info = NULL;
    *actualCount = 0;
    return (char **) NULL;
}

int
XFreeFontInfo (
    char **names,
    XFontStruct *info,
    int actualCount)
{
	register int i;
	if (names) {
		Xfree (names[0]-1);
		for (i = 1; i < actualCount; i++) {
			Xfree (names[i]);
		}
		Xfree(names);
	}
	if (info) {
		for (i = 0; i < actualCount; i++) {
			if (info[i].per_char)
#ifdef USE_XF86BIGFONT
				_XF86BigfontFreeFontMetrics(&info[i]);
#else
				Xfree (info[i].per_char);
#endif
			if (info[i].properties)
				Xfree (info[i].properties);
			}
		Xfree(info);
	}
	return 1;
}