[Issue 8 drafts 0001353]: strftime errno issues
The following issue has been set as DUPLICATE OF issue 0001386. == https://austingroupbugs.net/view.php?id=1353 == Reported By:dennisw Assigned To: == Project:Issue 8 drafts Issue ID: 1353 Category: System Interfaces Type: Error Severity: Objection Priority: normal Status: Closed Name: Dennis Wölfing Organization: User Reference: Section:strftime Page Number:1964-1965 Line Number:63875-63884 Final Accepted Text: Resolution: Duplicate Duplicate: 0 Fixed in Version: == Date Submitted: 2020-06-28 15:10 UTC Last Modified: 2020-09-03 15:49 UTC == Summary:strftime errno issues == Relationships ID Summary -- duplicate of0001386 strftime RETURN VALUE and ERRORS problems == Issue History Date ModifiedUsername FieldChange == 2020-06-28 15:10 denniswNew Issue 2020-06-28 15:10 denniswName => Dennis Wölfing 2020-06-28 15:10 denniswSection => strftime 2020-06-28 15:10 denniswPage Number => 1964-1965 2020-06-28 15:10 denniswLine Number => 63875-63884 2020-08-08 19:51 eggert Note Added: 0004903 2020-08-08 22:41 Don Cragun Relationship added related to 0001386 2020-08-08 22:44 Don Cragun Note Edited: 0004903 2020-09-03 15:49 Don Cragun Status New => Closed 2020-09-03 15:49 Don Cragun Resolution Open => Duplicate 2020-09-03 15:49 Don Cragun Relationship replacedduplicate of 0001386 ==
[Issue 8 drafts 0001353]: strftime errno issues
The following issue has been CLOSED. == https://austingroupbugs.net/view.php?id=1353 == Reported By:dennisw Assigned To: == Project:Issue 8 drafts Issue ID: 1353 Category: System Interfaces Type: Error Severity: Objection Priority: normal Status: Closed Name: Dennis Wölfing Organization: User Reference: Section:strftime Page Number:1964-1965 Line Number:63875-63884 Final Accepted Text: Resolution: Duplicate Duplicate: 0 Fixed in Version: == Date Submitted: 2020-06-28 15:10 UTC Last Modified: 2020-09-03 15:49 UTC == Summary:strftime errno issues == Relationships ID Summary -- related to 0001386 strftime RETURN VALUE and ERRORS problems == Issue History Date ModifiedUsername FieldChange == 2020-06-28 15:10 denniswNew Issue 2020-06-28 15:10 denniswName => Dennis Wölfing 2020-06-28 15:10 denniswSection => strftime 2020-06-28 15:10 denniswPage Number => 1964-1965 2020-06-28 15:10 denniswLine Number => 63875-63884 2020-08-08 19:51 eggert Note Added: 0004903 2020-08-08 22:41 Don Cragun Relationship added related to 0001386 2020-08-08 22:44 Don Cragun Note Edited: 0004903 2020-09-03 15:49 Don Cragun Status New => Closed 2020-09-03 15:49 Don Cragun Resolution Open => Duplicate ==
[Issue 8 drafts 0001353]: strftime errno issues
The following issue has been set as RELATED TO issue 0001386. == https://www.austingroupbugs.net/view.php?id=1353 == Reported By:dennisw Assigned To: == Project:Issue 8 drafts Issue ID: 1353 Category: System Interfaces Type: Error Severity: Objection Priority: normal Status: New Name: Dennis Wölfing Organization: User Reference: Section:strftime Page Number:1964-1965 Line Number:63875-63884 Final Accepted Text: == Date Submitted: 2020-06-28 15:10 UTC Last Modified: 2020-08-08 19:51 UTC == Summary:strftime errno issues == Relationships ID Summary -- related to 0001386 strftime RETURN VALUE and ERRORS problems == Issue History Date ModifiedUsername FieldChange == 2020-06-28 15:10 denniswNew Issue 2020-06-28 15:10 denniswName => Dennis Wölfing 2020-06-28 15:10 denniswSection => strftime 2020-06-28 15:10 denniswPage Number => 1964-1965 2020-06-28 15:10 denniswLine Number => 63875-63884 2020-08-08 19:51 eggert Note Added: 0004903 2020-08-08 22:41 Don Cragun Relationship added related to 0001386 ==
[Issue 8 drafts 0001353]: strftime errno issues
A NOTE has been added to this issue. == https://www.austingroupbugs.net/view.php?id=1353 == Reported By:dennisw Assigned To: == Project:Issue 8 drafts Issue ID: 1353 Category: System Interfaces Type: Error Severity: Objection Priority: normal Status: New Name: Dennis Wölfing Organization: User Reference: Section:strftime Page Number:1964-1965 Line Number:63875-63884 Final Accepted Text: == Date Submitted: 2020-06-28 15:10 UTC Last Modified: 2020-08-08 19:51 UTC == Summary:strftime errno issues == -- (0004903) eggert (reporter) - 2020-08-08 19:51 https://www.austingroupbugs.net/view.php?id=1353#c4903 -- Aarrgh, I submitted an objection 0001386 along similar lines, before noticing this objection. The two objections mainly agree. My proposal required errno to be preserved on success only when the returned value is 0 (as that's all that applications need), but the stronger requirement proposed here is also fine (and the tzdb reference implementation also satisfies the stronger requirement). Also, I suggested that EOVERFLOW be a "may fail" rather than "shall fail" error. Issue History Date ModifiedUsername FieldChange == 2020-06-28 15:10 denniswNew Issue 2020-06-28 15:10 denniswName => Dennis Wölfing 2020-06-28 15:10 denniswSection => strftime 2020-06-28 15:10 denniswPage Number => 1964-1965 2020-06-28 15:10 denniswLine Number => 63875-63884 2020-08-08 19:51 eggert Note Added: 0004903 ==
[Issue 8 drafts 0001353]: strftime errno issues
The following issue has been SUBMITTED. == https://www.austingroupbugs.net/view.php?id=1353 == Reported By:dennisw Assigned To: == Project:Issue 8 drafts Issue ID: 1353 Category: System Interfaces Type: Error Severity: Objection Priority: normal Status: New Name: Dennis Wölfing Organization: User Reference: Section:strftime Page Number:1964-1965 Line Number:63875-63884 Final Accepted Text: == Date Submitted: 2020-06-28 15:10 UTC Last Modified: 2020-06-28 15:10 UTC == Summary:strftime errno issues Description: Bug https://www.austingroupbugs.net/view.php?id=169 added the requirement that strftime sets errno on failure. However there are three issues with this. 1. The RETURN VALUE section implies that strftime can only fail if the buffer is not big enough, which contradicts the ERRORS section. 2. The draft standard now requires that strftime sets errno if the result does not fit into the buffer but it does not specify which value errno is set to. 3. Even tough strftime is required to set errno on failure an application cannot reliably know whether errno contains a meaningful value because a return value of 0 may also mean that a successful conversion resulted in an empty string. I don't know of any POSIX conforming implementations that currently set errno on failure. However I found that the Windows implementation of strftime sets errno to ERANGE when the buffer is too small. Note that implementations that currently do not set errno already need to change in order to conform to the draft 1 requirements. Desired Action: On page 1964 after line 63875 add these two paragraphs with CX shading:These functions shall not change the setting of errno if successful. Since 0 is returned on error and is also a valid return on success, an application wishing to check for error situations should set errno to 0, then call strftime( ) or strftime_l( ), then check errno. On page 1964 lines 63877-63880 changeIf the total number of resulting bytes including the terminating null byte is not more than maxsize, these functions shall return the number of bytes placed into the array pointed to by s, not including the terminating NUL character. Otherwise, 0 shall be returned, [CX]errno shall be set to indicate the error,[/CX] and the contents of the array are unspecified.toIf all conversions are successful and the total number of resulting bytes including the terminating null byte is not more than maxsize, these functions shall return the number of bytes placed into the array pointed to by s, not including the terminating NUL character. Otherwise, 0 shall be returned, [CX]errno shall be set to indicate the error,[/CX] and the contents of the array are unspecified. On page 1965 after line 63884 add with CX shading:[ERANGE]The total number of resulting bytes including the terminating null byte is more than maxsize. == Issue History Date ModifiedUsername FieldChange == 2020-06-28 15:10 denniswNew Issue 2020-06-28 15:10 denniswName => Dennis Wölfing 2020-06-28 15:10 denniswSection => strftime 2020-06-28 15:10 denniswPage Number => 1964-1965 2020-06-28 15:10 denniswLine Number => 63875-63884 ==
