path: root/xorg-server/xkb/XKBGAlloc.c

/************************************************************
Copyright (c) 1993 by Silicon Graphics Computer Systems, Inc.

Permission to use, copy, modify, and distribute this
software and its documentation for any purpose and without
fee is hereby granted, provided that the above copyright
notice appear in all copies and that both that copyright
notice and this permission notice appear in supporting
documentation, and that the name of Silicon Graphics not be
used in advertising or publicity pertaining to distribution
of the software without specific prior written permission.
Silicon Graphics makes no representation about the suitability
of this software for any purpose. It is provided "as is"
without any express or implied warranty.

SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
GRAPHICS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION  WITH
THE USE OR PERFORMANCE OF THIS SOFTWARE.

********************************************************/

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <stdio.h>
#include <X11/X.h>
#include <X11/Xproto.h>
#include "misc.h"
#include "inputstr.h"
#include <xkbsrv.h>
#include "xkbgeom.h"

/***====================================================================***/

static void
_XkbFreeGeomLeafElems(Bool freeAll,
                      int first,
                      int count,
                      unsigned short *num_inout,
                      unsigned short *sz_inout,
                      char **elems, unsigned int elem_sz)
{
    if ((freeAll) || (*elems == NULL)) {
        *num_inout = *sz_inout = 0;
        free(*elems);
        *elems = NULL;
        return;
    }

    if ((first >= (*num_inout)) || (first < 0) || (count < 1))
        return;

    if (first + count >= (*num_inout)) {
        /* truncating the array is easy */
        (*num_inout) = first;
    }
    else {
        char *ptr;
        int extra;

        ptr = *elems;
        extra = ((*num_inout) - (first + count)) * elem_sz;
        if (extra > 0)
            memmove(&ptr[first * elem_sz], &ptr[(first + count) * elem_sz],
                    extra);
        (*num_inout) -= count;
    }
    return;
}

typedef void (*ContentsClearFunc) (char *       /* priv */
    );

static void
_XkbFreeGeomNonLeafElems(Bool freeAll,
                         int first,
                         int count,
                         unsigned short *num_inout,
                         unsigned short *sz_inout,
                         char **elems,
                         unsigned int elem_sz, ContentsClearFunc freeFunc)
{
    register int i;
    register char *ptr;

    if (freeAll) {
        first = 0;
        count = (*num_inout);
    }
    else if ((first >= (*num_inout)) || (first < 0) || (count < 1))
        return;
    else if (first + count > (*num_inout))
        count = (*num_inout) - first;
    if (*elems == NULL)
        return;

    if (freeFunc) {
        ptr = *elems;
        ptr += first * elem_sz;
        for (i = 0; i < count; i++) {
            (*freeFunc) (ptr);
            ptr += elem_sz;
        }
    }
    if (freeAll) {
        (*num_inout) = (*sz_inout) = 0;
        free(*elems);
        *elems = NULL;
    }
    else if (first + count >= (*num_inout))
        *num_inout = first;
    else {
        i = ((*num_inout) - (first + count)) * elem_sz;
        ptr = *elems;
        memmove(&ptr[first * elem_sz], &ptr[(first + count) * elem_sz], i);
        (*num_inout) -= count;
    }
    return;
}

/***====================================================================***/

static void
_XkbClearProperty(char *prop_in)
{
    XkbPropertyPtr prop = (XkbPropertyPtr) prop_in;

    free(prop->name);
    prop->name = NULL;
    free(prop->value);
    prop->value = NULL;
    return;
}

void
XkbFreeGeomProperties(XkbGeometryPtr geom, int first, int count, Bool freeAll)
{
    _XkbFreeGeomNonLeafElems(freeAll, first, count,
                             &geom->num_properties, &geom->sz_properties,
                             (char **) &geom->properties,
                             sizeof(XkbPropertyRec), _XkbClearProperty);
    return;
}

/***====================================================================***/

void
XkbFreeGeomKeyAliases(XkbGeometryPtr geom, int first, int count, Bool freeAll)
{
    _XkbFreeGeomLeafElems(freeAll, first, count,
                          &geom->num_key_aliases, &geom->sz_key_aliases,
                          (char **) &geom->key_aliases, sizeof(XkbKeyAliasRec));
    return;
}

/***====================================================================***/

static void
_XkbClearColor(char *color_in)
{
    XkbColorPtr color = (XkbColorPtr) color_in;

    free(color->spec);
    return;
}

void
XkbFreeGeomColors(XkbGeometryPtr geom, int first, int count, Bool freeAll)
{
    _XkbFreeGeomNonLeafElems(freeAll, first, count,
                             &geom->num_colors, &geom->sz_colors,
                             (char **) &geom->colors,
                             sizeof(XkbColorRec), _XkbClearColor);
    return;
}

/***====================================================================***/

void
XkbFreeGeomPoints(XkbOutlinePtr outline, int first, int count, Bool freeAll)
{
    _XkbFreeGeomLeafElems(freeAll, first, count,
                          &outline->num_points, &outline->sz_points,
                          (char **) &outline->points, sizeof(XkbPointRec));
    return;
}

/***====================================================================***/

static void
_XkbClearOutline(char *outline_in)
{
    XkbOutlinePtr outline = (XkbOutlinePtr) outline_in;

    if (outline->points != NULL)
        XkbFreeGeomPoints(outline, 0, outline->num_points, TRUE);
    return;
}

void
XkbFreeGeomOutlines(XkbShapePtr shape, int first, int count, Bool freeAll)
{
    _XkbFreeGeomNonLeafElems(freeAll, first, count,
                             &shape->num_outlines, &shape->sz_outlines,
                             (char **) &shape->outlines,
                             sizeof(XkbOutlineRec), _XkbClearOutline);

    return;
}

/***====================================================================***/

static void
_XkbClearShape(char *shape_in)
{
    XkbShapePtr shape = (XkbShapePtr) shape_in;

    if (shape->outlines)
        XkbFreeGeomOutlines(shape, 0, shape->num_outlines, TRUE);
    return;
}

void
XkbFreeGeomShapes(XkbGeometryPtr geom, int first, int count, Bool freeAll)
{
    _XkbFreeGeomNonLeafElems(freeAll, first, count,
                             &geom->num_shapes, &geom->sz_shapes,
                             (char **) &geom->shapes,
                             sizeof(XkbShapeRec), _XkbClearShape);
    return;
}

/***====================================================================***/

void
XkbFreeGeomOverlayKeys(XkbOverlayRowPtr row, int first, int count, Bool freeAll)
{
    _XkbFreeGeomLeafElems(freeAll, first, count,
                          &row->num_keys, &row->sz_keys,
                          (char **) &row->keys, sizeof(XkbOverlayKeyRec));
    return;
}

/***====================================================================***/

void
XkbFreeGeomKeys(XkbRowPtr row, int first, int count, Bool freeAll)
{
    _XkbFreeGeomLeafElems(freeAll, first, count,
                          &row->num_keys, &row->sz_keys,
                          (char **) &row->keys, sizeof(XkbKeyRec));
    return;
}

/***====================================================================***/

static void
_XkbClearRow(char *row_in)
{
    XkbRowPtr row = (XkbRowPtr) row_in;

    if (row->keys != NULL)
        XkbFreeGeomKeys(row, 0, row->num_keys, TRUE);
    return;
}

void
XkbFreeGeomRows(XkbSectionPtr section, int first, int count, Bool freeAll)
{
    _XkbFreeGeomNonLeafElems(freeAll, first, count,
                             &section->num_rows, &section->sz_rows,
                             (char **) &section->rows,
                             sizeof(XkbRowRec), _XkbClearRow);
}

/***====================================================================***/

static void
_XkbClearSection(char *section_in)
{
    XkbSectionPtr section = (XkbSectionPtr) section_in;

    if (section->rows != NULL)
        XkbFreeGeomRows(section, 0, section->num_rows, TRUE);
    if (section->doodads != NULL) {
        XkbFreeGeomDoodads(section->doodads, section->num_doodads, TRUE);
        section->doodads = NULL;
    }
    return;
}

void
XkbFreeGeomSections(XkbGeometryPtr geom, int first, int count, Bool freeAll)
{
    _XkbFreeGeomNonLeafElems(freeAll, first, count,
                             &geom->num_sections, &geom->sz_sections,
                             (char **) &geom->sections,
                             sizeof(XkbSectionRec), _XkbClearSection);
    return;
}

/***====================================================================***/

static void
_XkbClearDoodad(char *doodad_in)
{
    XkbDoodadPtr doodad = (XkbDoodadPtr) doodad_in;

    switch (doodad->any.type) {
    case XkbTextDoodad:
    {
        free(doodad->text.text);
        doodad->text.text = NULL;
        free(doodad->text.font);
        doodad->text.font = NULL;
    }
        break;
    case XkbLogoDoodad:
    {
        free(doodad->logo.logo_name);
        doodad->logo.logo_name = NULL;
    }
        break;
    }
    return;
}

void
XkbFreeGeomDoodads(XkbDoodadPtr doodads, int nDoodads, Bool freeAll)
{
    register int i;
    register XkbDoodadPtr doodad;

    if (doodads) {
        for (i = 0, doodad = doodads; i < nDoodads; i++, doodad++) {
            _XkbClearDoodad((char *) doodad);
        }
        if (freeAll)
            free(doodads);
    }
    return;
}

void
XkbFreeGeometry(XkbGeometryPtr geom, unsigned which, Bool freeMap)
{
    if (geom == NULL)
        return;
    if (freeMap)
        which = XkbGeomAllMask;
    if ((which & XkbGeomPropertiesMask) && (geom->properties != NULL))
        XkbFreeGeomProperties(geom, 0, geom->num_properties, TRUE);
    if ((which & XkbGeomColorsMask) && (geom->colors != NULL))
        XkbFreeGeomColors(geom, 0, geom->num_colors, TRUE);
    if ((which & XkbGeomShapesMask) && (geom->shapes != NULL))
        XkbFreeGeomShapes(geom, 0, geom->num_shapes, TRUE);
    if ((which & XkbGeomSectionsMask) && (geom->sections != NULL))
        XkbFreeGeomSections(geom, 0, geom->num_sections, TRUE);
    if ((which & XkbGeomDoodadsMask) && (geom->doodads != NULL)) {
        XkbFreeGeomDoodads(geom->doodads, geom->num_doodads, TRUE);
        geom->doodads = NULL;
        geom->num_doodads = geom->sz_doodads = 0;
    }
    if ((which & XkbGeomKeyAliasesMask) && (geom->key_aliases != NULL))
        XkbFreeGeomKeyAliases(geom, 0, geom->num_key_aliases, TRUE);
    if (freeMap) {
        free(geom->label_font);
        geom->label_font = NULL;
        free(geom);
    }
    return;
}

/***====================================================================***/

/**
 * Resize and clear an XKB geometry item array. The array size may
 * grow or shrink unlike in _XkbGeomAlloc.
 *
 * @param buffer[in,out]  buffer to reallocate and clear
 * @param szItems[in]     currently allocated item count for "buffer"
 * @param nrItems[in]     required item count for "buffer"
 * @param itemSize[in]    size of a single item in "buffer"
 * @param clearance[in]   items to clear after reallocation
 *
 * @see _XkbGeomAlloc
 *
 * @return TRUE if reallocation succeeded. Otherwise FALSE is returned
 *         and contents of "buffer" aren't touched.
 */
Bool
XkbGeomRealloc(void **buffer, int szItems, int nrItems,
               int itemSize, XkbGeomClearance clearance)
{
    void *items;
    int clearBegin;

    /* Check validity of arguments. */
    if (!buffer)
        return FALSE;
    items = *buffer;
    if (!((items && (szItems > 0)) || (!items && !szItems)))
        return FALSE;
    /* Check if there is need to resize. */
    if (nrItems != szItems)
        if (!(items = reallocarray(items, nrItems, itemSize)))
            return FALSE;
    /* Clear specified items to zero. */
    switch (clearance) {
    case XKB_GEOM_CLEAR_EXCESS:
        clearBegin = szItems;
        break;
    case XKB_GEOM_CLEAR_ALL:
        clearBegin = 0;
        break;
    case XKB_GEOM_CLEAR_NONE:
    default:
        clearBegin = nrItems;
        break;
    }
    if (items && (clearBegin < nrItems))
        memset((char *) items + (clearBegin * itemSize), 0,
               (nrItems - clearBegin) * itemSize);
    *buffer = items;
    return TRUE;
}

static Status
_XkbGeomAlloc(void **old,
              unsigned short *num,
              unsigned short *total, int num_new, size_t sz_elem)
{
    if (num_new < 1)
        return Success;
    if ((*old) == NULL)
        *num = *total = 0;

    if ((*num) + num_new <= (*total))
        return Success;

    *total = (*num) + num_new;

    if (!XkbGeomRealloc(old, *num, *total, sz_elem, XKB_GEOM_CLEAR_EXCESS)) {
        free(*old);
        (*old) = NULL;
        *total = *num = 0;
        return BadAlloc;
    }

    return Success;
}

#define	_XkbAllocProps(g,n) _XkbGeomAlloc((void *)&(g)->properties,\
				&(g)->num_properties,&(g)->sz_properties,\
				(n),sizeof(XkbPropertyRec))
#define	_XkbAllocColors(g,n) _XkbGeomAlloc((void *)&(g)->colors,\
				&(g)->num_colors,&(g)->sz_colors,\
				(n),sizeof(XkbColorRec))
#define	_XkbAllocShapes(g,n) _XkbGeomAlloc((void *)&(g)->shapes,\
				&(g)->num_shapes,&(g)->sz_shapes,\
				(n),sizeof(XkbShapeRec))
#define	_XkbAllocSections(g,n) _XkbGeomAlloc((void *)&(g)->sections,\
				&(g)->num_sections,&(g)->sz_sections,\
				(n),sizeof(XkbSectionRec))
#define	_XkbAllocDoodads(g,n) _XkbGeomAlloc((void *)&(g)->doodads,\
				&(g)->num_doodads,&(g)->sz_doodads,\
				(n),sizeof(XkbDoodadRec))
#define	_XkbAllocKeyAliases(g,n) _XkbGeomAlloc((void *)&(g)->key_aliases,\
				&(g)->num_key_aliases,&(g)->sz_key_aliases,\
				(n),sizeof(XkbKeyAliasRec))

#define	_XkbAllocOutlines(s,n) _XkbGeomAlloc((void *)&(s)->outlines,\
				&(s)->num_outlines,&(s)->sz_outlines,\
				(n),sizeof(XkbOutlineRec))
#define	_XkbAllocRows(s,n) _XkbGeomAlloc((void *)&(s)->rows,\
				&(s)->num_rows,&(s)->sz_rows,\
				(n),sizeof(XkbRowRec))
#define	_XkbAllocPoints(o,n) _XkbGeomAlloc((void *)&(o)->points,\
				&(o)->num_points,&(o)->sz_points,\
				(n),sizeof(XkbPointRec))
#define	_XkbAllocKeys(r,n) _XkbGeomAlloc((void *)&(r)->keys,\
				&(r)->num_keys,&(r)->sz_keys,\
				(n),sizeof(XkbKeyRec))
#define	_XkbAllocOverlays(s,n) _XkbGeomAlloc((void *)&(s)->overlays,\
				&(s)->num_overlays,&(s)->sz_overlays,\
				(n),sizeof(XkbOverlayRec))
#define	_XkbAllocOverlayRows(o,n) _XkbGeomAlloc((void *)&(o)->rows,\
				&(o)->num_rows,&(o)->sz_rows,\
				(n),sizeof(XkbOverlayRowRec))
#define	_XkbAllocOverlayKeys(r,n) _XkbGeomAlloc((void *)&(r)->keys,\
				&(r)->num_keys,&(r)->sz_keys,\
				(n),sizeof(XkbOverlayKeyRec))

Status
XkbAllocGeometry(XkbDescPtr xkb, XkbGeometrySizesPtr sizes)
{
    XkbGeometryPtr geom;
    Status rtrn;

    if (xkb->geom == NULL) {
        xkb->geom = calloc(1, sizeof(XkbGeometryRec));
        if (!xkb->geom)
            return BadAlloc;
    }
    geom = xkb->geom;
    if ((sizes->which & XkbGeomPropertiesMask) &&
        ((rtrn = _XkbAllocProps(geom, sizes->num_properties)) != Success)) {
        goto BAIL;
    }
    if ((sizes->which & XkbGeomColorsMask) &&
        ((rtrn = _XkbAllocColors(geom, sizes->num_colors)) != Success)) {
        goto BAIL;
    }
    if ((sizes->which & XkbGeomShapesMask) &&
        ((rtrn = _XkbAllocShapes(geom, sizes->num_shapes)) != Success)) {
        goto BAIL;
    }
    if ((sizes->which & XkbGeomSectionsMask) &&
        ((rtrn = _XkbAllocSections(geom, sizes->num_sections)) != Success)) {
        goto BAIL;
    }
    if ((sizes->which & XkbGeomDoodadsMask) &&
        ((rtrn = _XkbAllocDoodads(geom, sizes->num_doodads)) != Success)) {
        goto BAIL;
    }
    if ((sizes->which & XkbGeomKeyAliasesMask) &&
        ((rtrn =
          _XkbAllocKeyAliases(geom, sizes->num_key_aliases)) != Success)) {
        goto BAIL;
    }
    return Success;
 BAIL:
    XkbFreeGeometry(geom, XkbGeomAllMask, TRUE);
    xkb->geom = NULL;
    return rtrn;
}

/***====================================================================***/

XkbPropertyPtr
XkbAddGeomProperty(XkbGeometryPtr geom, char *name, char *value)
{
    register int i;
    register XkbPropertyPtr prop;

    if ((!geom) || (!name) || (!value))
        return NULL;
    for (i = 0, prop = geom->properties; i < geom->num_properties; i++, prop++) {
        if ((prop->name) && (strcmp(name, prop->name) == 0)) {
            free(prop->value);
            prop->value = strdup(value);
            return prop;
        }
    }
    if ((geom->num_properties >= geom->sz_properties) &&
        (_XkbAllocProps(geom, 1) != Success)) {
        return NULL;
    }
    prop = &geom->properties[geom->num_properties];
    prop->name = strdup(name);
    if (!prop->name)
        return NULL;
    prop->value = strdup(value);
    if (!prop->value) {
        free(prop->name);
        prop->name = NULL;
        return NULL;
    }
    geom->num_properties++;
    return prop;
}

XkbKeyAliasPtr
XkbAddGeomKeyAlias(XkbGeometryPtr geom, char *aliasStr, char *realStr)
{
    register int i;
    register XkbKeyAliasPtr alias;

    if ((!geom) || (!aliasStr) || (!realStr) || (!aliasStr[0]) || (!realStr[0]))
        return NULL;
    for (i = 0, alias = geom->key_aliases; i < geom->num_key_aliases;
         i++, alias++) {
        if (strncmp(alias->alias, aliasStr, XkbKeyNameLength) == 0) {
            memset(alias->real, 0, XkbKeyNameLength);
            strncpy(alias->real, realStr, XkbKeyNameLength);
            return alias;
        }
    }
    if ((geom->num_key_aliases >= geom->sz_key_aliases) &&
        (_XkbAllocKeyAliases(geom, 1) != Success)) {
        return NULL;
    }
    alias = &geom->key_aliases[geom->num_key_aliases];
    memset(alias, 0, sizeof(XkbKeyAliasRec));
    strncpy(alias->alias, aliasStr, XkbKeyNameLength);
    strncpy(alias->real, realStr, XkbKeyNameLength);
    geom->num_key_aliases++;
    return alias;
}

XkbColorPtr
XkbAddGeomColor(XkbGeometryPtr geom, char *spec, unsigned int pixel)
{
    register int i;
    register XkbColorPtr color;

    if ((!geom) || (!spec))
        return NULL;
    for (i = 0, color = geom->colors; i < geom->num_colors; i++, color++) {
        if ((color->spec) && (strcmp(color->spec, spec) == 0)) {
            color->pixel = pixel;
            return color;
        }
    }
    if ((geom->num_colors >= geom->sz_colors) &&
        (_XkbAllocColors(geom, 1) != Success)) {
        return NULL;
    }
    color = &geom->colors[geom->num_colors];
    color->pixel = pixel;
    color->spec = strdup(spec);
    if (!color->spec)
        return NULL;
    geom->num_colors++;
    return color;
}

XkbOutlinePtr
XkbAddGeomOutline(XkbShapePtr shape, int sz_points)
{
    XkbOutlinePtr outline;

    if ((!shape) || (sz_points < 0))
        return NULL;
    if ((shape->num_outlines >= shape->sz_outlines) &&
        (_XkbAllocOutlines(shape, 1) != Success)) {
        return NULL;
    }
    outline = &shape->outlines[shape->num_outlines];
    memset(outline, 0, sizeof(XkbOutlineRec));
    if ((sz_points > 0) && (_XkbAllocPoints(outline, sz_points) != Success))
        return NULL;
    shape->num_outlines++;
    return outline;
}

XkbShapePtr
XkbAddGeomShape(XkbGeometryPtr geom, Atom name, int sz_outlines)
{
    XkbShapePtr shape;
    register int i;

    if ((!geom) || (!name) || (sz_outlines < 0))
        return NULL;
    if (geom->num_shapes > 0) {
        for (shape = geom->shapes, i = 0; i < geom->num_shapes; i++, shape++) {
            if (name == shape->name)
                return shape;
        }
    }
    if ((geom->num_shapes >= geom->sz_shapes) &&
        (_XkbAllocShapes(geom, 1) != Success))
        return NULL;
    shape = &geom->shapes[geom->num_shapes];
    memset(shape, 0, sizeof(XkbShapeRec));
    if ((sz_outlines > 0) && (_XkbAllocOutlines(shape, sz_outlines) != Success))
        return NULL;
    shape->name = name;
    shape->primary = shape->approx = NULL;
    geom->num_shapes++;
    return shape;
}

XkbKeyPtr
XkbAddGeomKey(XkbRowPtr row)
{
    XkbKeyPtr key;

    if (!row)
        return NULL;
    if ((row->num_keys >= row->sz_keys) && (_XkbAllocKeys(row, 1) != Success))
        return NULL;
    key = &row->keys[row->num_keys++];
    memset(key, 0, sizeof(XkbKeyRec));
    return key;
}

XkbRowPtr
XkbAddGeomRow(XkbSectionPtr section, int sz_keys)
{
    XkbRowPtr row;

    if ((!section) || (sz_keys < 0))
        return NULL;
    if ((section->num_rows >= section->sz_rows) &&
        (_XkbAllocRows(section, 1) != Success))
        return NULL;
    row = &section->rows[section->num_rows];
    memset(row, 0, sizeof(XkbRowRec));
    if ((sz_keys > 0) && (_XkbAllocKeys(row, sz_keys) != Success))
        return NULL;
    section->num_rows++;
    return row;
}

XkbSectionPtr
XkbAddGeomSection(XkbGeometryPtr geom,
                  Atom name, int sz_rows, int sz_doodads, int sz_over)
{
    register int i;
    XkbSectionPtr section;

    if ((!geom) || (name == None) || (sz_rows < 0))
        return NULL;
    for (i = 0, section = geom->sections; i < geom->num_sections;
         i++, section++) {
        if (section->name != name)
            continue;
        if (((sz_rows > 0) && (_XkbAllocRows(section, sz_rows) != Success)) ||
            ((sz_doodads > 0) &&
             (_XkbAllocDoodads(section, sz_doodads) != Success)) ||
            ((sz_over > 0) && (_XkbAllocOverlays(section, sz_over) != Success)))
            return NULL;
        return section;
    }
    if ((geom->num_sections >= geom->sz_sections) &&
        (_XkbAllocSections(geom, 1) != Success))
        return NULL;
    section = &geom->sections[geom->num_sections];
    if ((sz_rows > 0) && (_XkbAllocRows(section, sz_rows) != Success))
        return NULL;
    if ((sz_doodads > 0) && (_XkbAllocDoodads(section, sz_doodads) != Success)) {
        if (section->rows) {
            free(section->rows);
            section->rows = NULL;
            section->sz_rows = section->num_rows = 0;
        }
        return NULL;
    }
    section->name = name;
    geom->num_sections++;
    return section;
}

XkbDoodadPtr
XkbAddGeomDoodad(XkbGeometryPtr geom, XkbSectionPtr section, Atom name)
{
    XkbDoodadPtr old, doodad;
    register int i, nDoodads;

    if ((!geom) || (name == None))
        return NULL;
    if ((section != NULL) && (section->num_doodads > 0)) {
        old = section->doodads;
        nDoodads = section->num_doodads;
    }
    else {
        old = geom->doodads;
        nDoodads = geom->num_doodads;
    }
    for (i = 0, doodad = old; i < nDoodads; i++, doodad++) {
        if (doodad->any.name == name)
            return doodad;
    }
    if (section) {
        if ((section->num_doodads >= geom->sz_doodads) &&
            (_XkbAllocDoodads(section, 1) != Success)) {
            return NULL;
        }
        doodad = &section->doodads[section->num_doodads++];
    }
    else {
        if ((geom->num_doodads >= geom->sz_doodads) &&
            (_XkbAllocDoodads(geom, 1) != Success))
            return NULL;
        doodad = &geom->doodads[geom->num_doodads++];
    }
    memset(doodad, 0, sizeof(XkbDoodadRec));
    doodad->any.name = name;
    return doodad;
}

XkbOverlayKeyPtr
XkbAddGeomOverlayKey(XkbOverlayPtr overlay,
                     XkbOverlayRowPtr row, char *over, char *under)
{
    register int i;
    XkbOverlayKeyPtr key;
    XkbSectionPtr section;
    XkbRowPtr row_under;
    Bool found;

    if ((!overlay) || (!row) || (!over) || (!under))
        return NULL;
    section = overlay->section_under;
    if (row->row_under >= section->num_rows)
        return NULL;
    row_under = &section->rows[row->row_under];
    for (i = 0, found = FALSE; i < row_under->num_keys; i++) {
        if (strncmp(under, row_under->keys[i].name.name, XkbKeyNameLength) == 0) {
            found = TRUE;
            break;
        }
    }
    if (!found)
        return NULL;
    if ((row->num_keys >= row->sz_keys) &&
        (_XkbAllocOverlayKeys(row, 1) != Success))
        return NULL;
    key = &row->keys[row->num_keys];
    strncpy(key->under.name, under, XkbKeyNameLength);
    strncpy(key->over.name, over, XkbKeyNameLength);
    row->num_keys++;
    return key;
}

XkbOverlayRowPtr
XkbAddGeomOverlayRow(XkbOverlayPtr overlay, int row_under, int sz_keys)
{
    register int i;
    XkbOverlayRowPtr row;

    if ((!overlay) || (sz_keys < 0))
        return NULL;
    if (row_under >= overlay->section_under->num_rows)
        return NULL;
    for (i = 0; i < overlay->num_rows; i++) {
        if (overlay->rows[i].row_under == row_under) {
            row = &overlay->rows[i];
            if ((row->sz_keys < sz_keys) &&
                (_XkbAllocOverlayKeys(row, sz_keys) != Success)) {
                return NULL;
            }
            return &overlay->rows[i];
        }
    }
    if ((overlay->num_rows >= overlay->sz_rows) &&
        (_XkbAllocOverlayRows(overlay, 1) != Success))
        return NULL;
    row = &overlay->rows[overlay->num_rows];
    memset(row, 0, sizeof(XkbOverlayRowRec));
    if ((sz_keys > 0) && (_XkbAllocOverlayKeys(row, sz_keys) != Success))
        return NULL;
    row->row_under = row_under;
    overlay->num_rows++;
    return row;
}

XkbOverlayPtr
XkbAddGeomOverlay(XkbSectionPtr section, Atom name, int sz_rows)
{
    register int i;
    XkbOverlayPtr overlay;

    if ((!section) || (name == None) || (sz_rows == 0))
        return NULL;

    for (i = 0, overlay = section->overlays; i < section->num_overlays;
         i++, overlay++) {
        if (overlay->name == name) {
            if ((sz_rows > 0) &&
                (_XkbAllocOverlayRows(overlay, sz_rows) != Success))
                return NULL;
            return overlay;
        }
    }
    if ((section->num_overlays >= section->sz_overlays) &&
        (_XkbAllocOverlays(section, 1) != Success))
        return NULL;
    overlay = &section->overlays[section->num_overlays];
    if ((sz_rows > 0) && (_XkbAllocOverlayRows(overlay, sz_rows) != Success))
        return NULL;
    overlay->name = name;
    overlay->section_under = section;
    section->num_overlays++;
    return overlay;
}