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Old 08-01-2008, 12:40 PM
"Alexander E. Patrakov"
Default Bug#493225: gcc-4.3: Should warn about format strings similar to "%-20.20s"

Package: gcc-4.3
Version: 4.3.1-2
Severity: wishlist

Some projects like exif use statements like this for aligning the output:

fprintf (stdout, "%-20.20s", C(CN(exif_tag_get_title_in_ifd (e->tag, ifd))));
printf ("|");

and this doesn't work (i.e., the output is misaligned because bytes,
characters and cells are completely different things) in multibyte locales.
IMHO it is a good idea to educate such ignorant upstreams with a new warning
about printf format strings that specify %s and the field width (and possibly

Alexander E. Patrakov

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