Grcov report - text-zero-len.c

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/*

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 * Copyright © 2006 Red Hat, Inc.

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 * Permission to use, copy, modify, distribute, and sell this software

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 * and its documentation for any purpose is hereby granted without

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 * fee, provided that the above copyright notice appear in all copies

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 * and that both that copyright notice and this permission notice

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 * appear in supporting documentation, and that the name of

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 * Red Hat, Inc. not be used in advertising or publicity pertaining to

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 * distribution of the software without specific, written prior

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 * permission. Red Hat, Inc. makes no representations about the

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 * suitability of this software for any purpose.  It is provided "as

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 * is" without express or implied warranty.

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 * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS

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 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

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 * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,

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 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER

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 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION

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 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR

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 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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 * Author: Behdad Esfahbod <behdad@behdad.org>

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*/

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/* Related bug 5177

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 * In short:

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 * _cairo_atsui_font_text_to_glyph with a zero-sized string crashes.

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 * Moreover, the fallback path in cairo_scaled_font_text_to_glyphs()

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 * when handling a zero-sized string, allocates a zero-sized glyph array

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 * and when NULL is returned by malloc, recognizes that as an out-of-memory

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 * error.  The glibc implementation of malloc() does not return NULL from

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 * malloc(0), but I don't think it's a safe assumption.

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 * By just bailing out on zero-sized text, we fix both issues.

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*/

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#include "cairo-test.h"

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#define NUM_TEXT 20

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#define TEXT_SIZE 12

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static cairo_bool_t

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text_extents_equal (const cairo_text_extents_t *A,

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	            const cairo_text_extents_t *B)

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    return A->x_bearing == B->x_bearing &&

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	   A->y_bearing == B->y_bearing &&

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	   A->width     == B->width     &&

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	   A->height    == B->height    &&

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	   A->x_advance == B->x_advance &&

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	   A->y_advance == B->y_advance;

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static cairo_bool_t

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font_extents_equal (const cairo_font_extents_t *A,

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	            const cairo_font_extents_t *B)

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    return A->ascent    == B->ascent        &&

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	   A->descent   == B->descent       &&

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	   A->height    == B->height        &&

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       A->max_x_advance == B->max_x_advance &&

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       A->max_y_advance == B->max_y_advance;

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static cairo_test_status_t

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3

draw (cairo_t *cr, int width, int height)

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    const cairo_test_context_t *ctx = cairo_test_get_context (cr);

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    cairo_text_extents_t extents, nil_extents;

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    cairo_font_extents_t font_extents, nil_font_extents;

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    cairo_scaled_font_t *scaled_font;

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    cairo_select_font_face (cr, CAIRO_TEST_FONT_FAMILY " Sans",

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			    CAIRO_FONT_SLANT_NORMAL,

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			    CAIRO_FONT_WEIGHT_NORMAL);

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    cairo_set_font_size (cr, 16);

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    cairo_move_to (cr, 10, 25);

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    cairo_show_text (cr, NULL);

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    cairo_show_text (cr, "");

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    cairo_show_glyphs (cr, NULL, 0);

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    cairo_show_glyphs (cr, (void*)8, 0);

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    cairo_move_to (cr, 10, 55);

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    cairo_text_path (cr, NULL);

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    cairo_text_path (cr, "");

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    cairo_glyph_path (cr, (void*)8, 0);

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    cairo_fill (cr);

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    memset (&nil_extents, 0, sizeof (cairo_text_extents_t));

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    memset (&extents, 0xff, sizeof (cairo_text_extents_t));

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    cairo_text_extents (cr, "", &extents);

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    if (! text_extents_equal (&extents, &nil_extents)) {

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	cairo_test_log (ctx, "Error: cairo_text_extents(\"\"); extents (%g, %g, %g, %g, %g, %g)\n",

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		        extents.x_bearing, extents.y_bearing,

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			extents.width, extents.height,

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			extents.x_advance, extents.y_advance);

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	return CAIRO_TEST_FAILURE;

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3

    memset (&extents, 0xff, sizeof (cairo_text_extents_t));

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    cairo_text_extents (cr, NULL, &extents);

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    if (! text_extents_equal (&extents, &nil_extents)) {

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	cairo_test_log (ctx, "Error: cairo_text_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n",

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		        extents.x_bearing, extents.y_bearing,

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			extents.width, extents.height,

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			extents.x_advance, extents.y_advance);

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	return CAIRO_TEST_FAILURE;

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3

    memset (&extents, 0xff, sizeof (cairo_text_extents_t));

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    cairo_glyph_extents (cr, (void*)8, 0, &extents);

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    if (! text_extents_equal (&extents, &nil_extents)) {

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	cairo_test_log (ctx, "Error: cairo_glyph_extents(); extents (%g, %g, %g, %g, %g, %g)\n",

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		        extents.x_bearing, extents.y_bearing,

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			extents.width, extents.height,

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			extents.x_advance, extents.y_advance);

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	return CAIRO_TEST_FAILURE;

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    scaled_font = cairo_get_scaled_font (cr);

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    memset (&extents, 0xff, sizeof (cairo_text_extents_t));

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    cairo_scaled_font_text_extents (scaled_font, "", &extents);

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    if (! text_extents_equal (&extents, &nil_extents)) {

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	cairo_test_log (ctx, "Error: cairo_scaled_font_text_extents(\"\"); extents (%g, %g, %g, %g, %g, %g)\n",

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		        extents.x_bearing, extents.y_bearing,

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			extents.width, extents.height,

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			extents.x_advance, extents.y_advance);

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	return CAIRO_TEST_FAILURE;

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    memset (&extents, 0xff, sizeof (cairo_text_extents_t));

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    cairo_scaled_font_text_extents (scaled_font, NULL, &extents);

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    if (! text_extents_equal (&extents, &nil_extents)) {

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	cairo_test_log (ctx, "Error: cairo_scaled_font_text_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n",

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		        extents.x_bearing, extents.y_bearing,

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			extents.width, extents.height,

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			extents.x_advance, extents.y_advance);

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	return CAIRO_TEST_FAILURE;

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    memset (&extents, 0xff, sizeof (cairo_text_extents_t));

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    cairo_scaled_font_glyph_extents (scaled_font, (void*)8, 0, &extents);

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    if (! text_extents_equal (&extents, &nil_extents)) {

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	cairo_test_log (ctx, "Error: cairo_scaled_font_glyph_extents(NULL); extents (%g, %g, %g, %g, %g, %g)\n",

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		        extents.x_bearing, extents.y_bearing,

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			extents.width, extents.height,

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			extents.x_advance, extents.y_advance);

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	return CAIRO_TEST_FAILURE;

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    /* Lets also try font size 0 while here */

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    cairo_set_font_size (cr, 0);

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    memset (&extents, 0xff, sizeof (cairo_text_extents_t));

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    cairo_text_extents (cr, "test", &extents);

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    if (! text_extents_equal (&extents, &nil_extents)) {

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	cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_text_extents(\"test\"); extents (%g, %g, %g, %g, %g, %g)\n",

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		        extents.x_bearing, extents.y_bearing,

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			extents.width, extents.height,

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			extents.x_advance, extents.y_advance);

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	return CAIRO_TEST_FAILURE;

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    memset (&nil_font_extents, 0, sizeof (cairo_font_extents_t));

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    memset (&font_extents, 0xff, sizeof (cairo_font_extents_t));

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    cairo_font_extents (cr,  &font_extents);

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    if (! font_extents_equal (&font_extents, &nil_font_extents)) {

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	cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_font_extents(); extents (%g, %g, %g, %g, %g)\n",

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		        font_extents.ascent, font_extents.descent,

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			font_extents.height,

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			font_extents.max_x_advance, font_extents.max_y_advance);

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	return CAIRO_TEST_FAILURE;

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    scaled_font = cairo_get_scaled_font (cr);

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    memset (&font_extents, 0xff, sizeof (cairo_font_extents_t));

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    cairo_scaled_font_extents (scaled_font,  &font_extents);

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    if (! font_extents_equal (&font_extents, &nil_font_extents)) {

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	cairo_test_log (ctx, "Error: cairo_set_font_size(0); cairo_scaled_font_extents(); extents (%g, %g, %g, %g, %g)\n",

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		        font_extents.ascent, font_extents.descent,

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			font_extents.height,

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			font_extents.max_x_advance, font_extents.max_y_advance);

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	return CAIRO_TEST_FAILURE;

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (text_zero_len,

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	    "Tests show_text and text_path with a zero-sized string",

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	    "text, stress, extents", /* keywords */

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	    NULL, /* requirements */

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	    0, 0,

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	    NULL, draw)