public inbox for ecos-bugs@sourceware.org help / color / mirror / Atom feed
From: bugzilla-daemon@bugs.ecos.sourceware.org To: ecos-bugs@ecos.sourceware.org Subject: [Bug 1001628] New: %g printf format prints more digits than expected Date: Tue, 24 Jul 2012 17:43:00 -0000 [thread overview] Message-ID: <bug-1001628-13@http.bugs.ecos.sourceware.org/> (raw) Please do not reply to this email. Use the web interface provided at: http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001628 Summary: %g printf format prints more digits than expected Product: eCos Version: CVS Platform: All OS/Version: All Status: UNCONFIRMED Severity: normal Priority: low Component: C library AssignedTo: unassigned@bugs.ecos.sourceware.org ReportedBy: bernd.edlinger@hotmail.de CC: ecos-bugs@ecos.sourceware.org Class: Advice Request Created an attachment (id=1841) --> (http://bugs.ecos.sourceware.org/attachment.cgi?id=1841) a proposed patch to fix this defect when a printf format like "%.7g" is used, you would expect to see at most 7 valid decimals. But if the value is very close to an integer like (float)5.000123 the output may look like "5.000123xxxx" with xxxx = 4 additional digits which contain only rounding errors. The correct output would be "5.000123", which is 7 valid digits. The reason is in "language/c/libc/stdio/current/src/output/vfnprintf.cxx", where the loop termination assumes the number of leading digits (in expcnt) to be zero, which is not always the case however. To fix this use the attached patch file. The patch also introduces an additional test case in "language/c/libc/stdio/current/tests/sprintf2.c", which will only succeed when the printf format is output correctly. -- Configure bugmail: http://bugs.ecos.sourceware.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
next reply other threads:[~2012-07-24 17:43 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-07-24 17:43 bugzilla-daemon [this message] 2012-07-25 8:07 ` [Bug 1001628] " bugzilla-daemon 2012-08-08 7:06 ` bugzilla-daemon 2012-08-11 6:28 ` bugzilla-daemon -- strict thread matches above, loose matches on Subject: below -- 2012-07-24 17:43 [Bug 1001628] New: " bugzilla-daemon
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-1001628-13@http.bugs.ecos.sourceware.org/ \ --to=bugzilla-daemon@bugs.ecos.sourceware.org \ --cc=ecos-bugs@ecos.sourceware.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).