http://llvm.org/bugs/show_bug.cgi?id=19559
Bug ID: 19559
Summary: Clang issues incorrect warning when leading [^]
scanset is used in scanf()
Product: clang
Version: 3.4
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
In a C program, the following code:
char foo[1024];
scanf("%[^]% ]", foo);
Causes the following warning:
warning: invalid conversion specifier ' ' [-Wformat-invalid-specifier]
This does not happen with the format string "%[]% ]", indicating that Clang
does not recognize that a closing bracket after the caret does not close the
scanset.
Relevant C99 section is 7.19.6.2p12: “If the conversion specifier begins with
[] or [^], the right bracket character is in the scanlist and the next
following right bracket character is the matching right bracket that ends the
specification; otherwise the first following right bracket character is the one
that ends the specification."
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