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* [Bug 1001628] New: %g printf format prints more digits than expected @ 2012-07-24 17:43 bugzilla-daemon 2012-07-25 8:07 ` [Bug 1001628] " bugzilla-daemon ` (2 more replies) 0 siblings, 3 replies; 7+ messages in thread From: bugzilla-daemon @ 2012-07-24 17:43 UTC (permalink / raw) To: unassigned 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 the assignee for the bug. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug 1001628] %g printf format prints more digits than expected 2012-07-24 17:43 [Bug 1001628] New: %g printf format prints more digits than expected bugzilla-daemon @ 2012-07-25 8:07 ` bugzilla-daemon 2012-08-08 7:06 ` bugzilla-daemon 2012-08-11 6:28 ` bugzilla-daemon 2 siblings, 0 replies; 7+ messages in thread From: bugzilla-daemon @ 2012-07-25 8:07 UTC (permalink / raw) To: unassigned Please do not reply to this email. Use the web interface provided at: http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001628 Bernd Edlinger <bernd.edlinger@hotmail.de> changed: What |Removed |Added ---------------------------------------------------------------------------- Flag| |Patch_or_Contribution+ -- Configure bugmail: http://bugs.ecos.sourceware.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug 1001628] %g printf format prints more digits than expected 2012-07-24 17:43 [Bug 1001628] New: %g printf format prints more digits than expected bugzilla-daemon 2012-07-25 8:07 ` [Bug 1001628] " bugzilla-daemon @ 2012-08-08 7:06 ` bugzilla-daemon 2012-08-11 6:28 ` bugzilla-daemon 2 siblings, 0 replies; 7+ messages in thread From: bugzilla-daemon @ 2012-08-08 7:06 UTC (permalink / raw) To: unassigned Please do not reply to this email. Use the web interface provided at: http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001628 Bernd Edlinger <bernd.edlinger@hotmail.de> changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment #1841|0 |1 is patch| | -- Configure bugmail: http://bugs.ecos.sourceware.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug 1001628] %g printf format prints more digits than expected 2012-07-24 17:43 [Bug 1001628] New: %g printf format prints more digits than expected bugzilla-daemon 2012-07-25 8:07 ` [Bug 1001628] " bugzilla-daemon 2012-08-08 7:06 ` bugzilla-daemon @ 2012-08-11 6:28 ` bugzilla-daemon 2 siblings, 0 replies; 7+ messages in thread From: bugzilla-daemon @ 2012-08-11 6:28 UTC (permalink / raw) To: unassigned Please do not reply to this email. Use the web interface provided at: http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001628 --- Comment #1 from Bernd Edlinger <bernd.edlinger@hotmail.de> 2012-08-11 07:28:22 BST --- see bug #20804 for a cumulative patch that fixes several issues, including the %g format. -- Configure bugmail: http://bugs.ecos.sourceware.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug 1001628] New: %g printf format prints more digits than expected @ 2012-07-24 17:43 bugzilla-daemon 2012-07-25 8:07 ` [Bug 1001628] " bugzilla-daemon ` (2 more replies) 0 siblings, 3 replies; 7+ messages in thread From: bugzilla-daemon @ 2012-07-24 17:43 UTC (permalink / raw) To: ecos-bugs 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. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug 1001628] %g printf format prints more digits than expected 2012-07-24 17:43 [Bug 1001628] New: " bugzilla-daemon @ 2012-07-25 8:07 ` bugzilla-daemon 2012-08-08 7:06 ` bugzilla-daemon 2012-08-11 6:28 ` bugzilla-daemon 2 siblings, 0 replies; 7+ messages in thread From: bugzilla-daemon @ 2012-07-25 8:07 UTC (permalink / raw) To: ecos-bugs Please do not reply to this email. Use the web interface provided at: http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001628 Bernd Edlinger <bernd.edlinger@hotmail.de> changed: What |Removed |Added ---------------------------------------------------------------------------- Flag| |Patch_or_Contribution+ -- 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. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug 1001628] %g printf format prints more digits than expected 2012-07-24 17:43 [Bug 1001628] New: " bugzilla-daemon 2012-07-25 8:07 ` [Bug 1001628] " bugzilla-daemon @ 2012-08-08 7:06 ` bugzilla-daemon 2012-08-11 6:28 ` bugzilla-daemon 2 siblings, 0 replies; 7+ messages in thread From: bugzilla-daemon @ 2012-08-08 7:06 UTC (permalink / raw) To: ecos-bugs Please do not reply to this email. Use the web interface provided at: http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001628 Bernd Edlinger <bernd.edlinger@hotmail.de> changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment #1841|0 |1 is patch| | -- 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. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug 1001628] %g printf format prints more digits than expected 2012-07-24 17:43 [Bug 1001628] New: " bugzilla-daemon 2012-07-25 8:07 ` [Bug 1001628] " bugzilla-daemon 2012-08-08 7:06 ` bugzilla-daemon @ 2012-08-11 6:28 ` bugzilla-daemon 2 siblings, 0 replies; 7+ messages in thread From: bugzilla-daemon @ 2012-08-11 6:28 UTC (permalink / raw) To: ecos-bugs Please do not reply to this email. Use the web interface provided at: http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001628 --- Comment #1 from Bernd Edlinger <bernd.edlinger@hotmail.de> 2012-08-11 07:28:22 BST --- see bug #20804 for a cumulative patch that fixes several issues, including the %g format. -- 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. ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2012-08-11 6:28 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-07-24 17:43 [Bug 1001628] New: %g printf format prints more digits than expected bugzilla-daemon 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 2012-07-25 8:07 ` [Bug 1001628] " bugzilla-daemon 2012-08-08 7:06 ` bugzilla-daemon 2012-08-11 6:28 ` bugzilla-daemon
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