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author | Behdad Esfahbod <behdad@behdad.org> | 2006-12-28 19:51:20 -0500 |
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committer | Behdad Esfahbod <behdad@behdad.org> | 2006-12-28 20:00:16 -0500 |
commit | ab29396ef9f68f5534f927b2b5bb0a7ffac86509 (patch) | |
tree | 01dcebb3e98a59b707bc21a31f5956188973fe14 /test/text-zero-len.c | |
parent | 2d30161e8922e66b276341810c21ce1b740f6699 (diff) | |
download | cairo-ab29396ef9f68f5534f927b2b5bb0a7ffac86509.tar.gz |
[test] Add new test text-zero-len (#5177)
The test passes an empty string to cairo_show_text, cairo_text_path, and
cairo_text_extents, and NULL and an invalid pointer, with zero num_glyphs to
cairo_show_glyphs, cairo_glyph_path, and cairo_glyph_extents.
Diffstat (limited to 'test/text-zero-len.c')
-rw-r--r-- | test/text-zero-len.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/test/text-zero-len.c b/test/text-zero-len.c new file mode 100644 index 000000000..57c36fdb8 --- /dev/null +++ b/test/text-zero-len.c @@ -0,0 +1,88 @@ +/* + * Copyright © 2006 Red Hat, Inc. + * + * 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, and that the name of + * Red Hat, Inc. not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior + * permission. Red Hat, Inc. makes no representations about the + * suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL RED HAT, INC. 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. + * + * Author: Behdad Esfahbod <behdad@behdad.org> + */ + +/* Related bug 5177 + * + * In short: + * + * _cairo_atsui_font_text_to_glyph with a zero-sized string crashes. + * + * Moreover, the fallback path in cairo_scaled_font_text_to_glyphs() + * when handling a zero-sized string, allocates a zero-sized glyph array + * and when NULL is returned by malloc, recognizes that as an out-of-memory + * error. The glibc implementation of malloc() does not return NULL from + * malloc(0), but I don't think it's a safe assumption. + * + * By just bailing out on zero-sized text, we fix both issues. + */ + +#include "cairo-test.h" + +#define WIDTH 60 +#define HEIGHT 60 +#define NUM_TEXT 20 +#define TEXT_SIZE 12 + +static cairo_test_draw_function_t draw; + +cairo_test_t test = { + "text-zero-len", + "Tests show_text and text_path with a zero-sized string", + WIDTH, HEIGHT, + draw +}; + +/* Draw the word cairo at NUM_TEXT different angles */ +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_text_extents_t extents; + + cairo_select_font_face (cr, "Bitstream Vera Sans", + CAIRO_FONT_SLANT_NORMAL, + CAIRO_FONT_WEIGHT_NORMAL); + cairo_set_font_size (cr, 16); + + cairo_move_to (cr, 10, 25); + cairo_show_text (cr, ""); + cairo_show_glyphs (cr, NULL, 0); + cairo_show_glyphs (cr, (void*)8, 0); + + cairo_move_to (cr, 10, 55); + cairo_text_path (cr, ""); + cairo_glyph_path (cr, (void*)8, 0); + cairo_fill (cr); + + cairo_text_extents (cr, "", &extents); + cairo_glyph_extents (cr, (void*)8, 0, &extents); + + return CAIRO_TEST_SUCCESS; +} + +int +main (void) +{ + return cairo_test (&test); +} |