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checkpatch: Detect newlines in error_report and other error functions 

We don't want newlines embedded in error messages. This seems to be a common
problem with new code so let's try to catch it with checkpatch.

This will not catch cases where newlines are inserted into the middle of an
existing multi-line statement. But those cases should be rare.

Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Message-Id: <1449858642-24267-1-git-send-email-jjherne@linux.vnet.ibm.com>
[Rephrased "Error function text" to "Error messages", dropped
error_vprintf, error_printf, error_printf from $qemu_error_funcs,
because they may legitimately print newlines]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Jason J. Herne 2015-12-11 13:30:42 -05:00 committed by Markus Armbruster
parent 533fdaedeb
commit 5d596c245d
1 changed files with 36 additions and 0 deletions
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36
scripts/checkpatch.pl
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@ -2498,6 +2498,42 @@ sub process {
WARN("use QEMU instead of Qemu or QEmu\n" . $herecurr);
}
# Qemu error function tests
# Find newlines in error messages
my $qemu_error_funcs = qr{error_setg|
error_setg_errno|
error_setg_win32|
error_set|
error_vreport|
error_report}x;
if ($rawline =~ /\b(?:$qemu_error_funcs)\s*\(\s*\".*\\n/) {
WARN("Error messages should not contain newlines\n" . $herecurr);
}
# Continue checking for error messages that contains newlines. This
# check handles cases where string literals are spread over multiple lines.
# Example:
# error_report("Error msg line #1"
# "Error msg line #2\n");
my $quoted_newline_regex = qr{\+\s*\".*\\n.*\"};
my $continued_str_literal = qr{\+\s*\".*\"};
if ($rawline =~ /$quoted_newline_regex/) {
# Backtrack to first line that does not contain only a quoted literal
# and assume that it is the start of the statement.
my $i = $linenr - 2;
while (($i >= 0) & $rawlines[$i] =~ /$continued_str_literal/) {
$i--;
}
if ($rawlines[$i] =~ /\b(?:$qemu_error_funcs)\s*\(/) {
WARN("Error messages should not contain newlines\n" . $herecurr);
}
}
# check for non-portable ffs() calls that have portable alternatives in QEMU
if ($line =~ /\bffs\(/) {
ERROR("use ctz32() instead of ffs()\n" . $herecurr);