https://bugzilla.kernel.org/show_bug.cgi?id=215844 Bug ID: 215844 Summary: scanf manpage incorrectly says that ll (ell-ell) is equivalent to L Product: Documentation Version: unspecified Hardware: All OS: Linux Status: NEW Severity: normal Priority: P1 Component: man-pages Assignee: documentation_man-pages@xxxxxxxxxxxxxxxxxxxx Reporter: rootkea@xxxxxxxxx Regression: No Hello! manpage of scanf says that "Specifying two l characters is equivalent to L". But that's not true. Please check the following code snippet: #include <stdio.h> int main(void) { long double ld; long long n; scanf("%Lf", &ld); scanf("%llf", &ld); scanf("%Ln", &n); scanf("%lln", &n); return 0; } gcc throws these warnings correctly: warning: use of ‘ll’ length modifier with ‘f’ type character has either no effect or undefined behavior [-Wformat=] 9 | scanf("%llf", &ld); | ^ warning: use of ‘L’ length modifier with ‘n’ type character has either no effect or undefined behavior [-Wformat=] 11 | scanf("%Ln", &n); | ^ I think, we need to add separate entry for `ll` (ell-ell) like printf(3). Also, another related issue is that scanf(3) doesn't mention that conversion specifiers like `%Ld`, `%Li` etc. are GNU nonstandard extensions unlike printf(3) which clearly mentions the nonportable part. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
