From eac4405af00464a4268cfd13b25224901c193988 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Thu, 1 Nov 2018 17:20:27 +0000 Subject: [PATCH] Avoid printf ("%s", NULL) in posix/bug-regex22.c. Building posix/bug-regex22.c fails with GCC mainline because of -Wformat-overflow= warnings for NULL arguments to %s formats. This is *not* testing how glibc handles such format arguments; in the context of the messages in question it makes no sense to pass NULL to such a %s format (the code passes s, inside "if (s == NULL)"). So this patch changes the code not to pass such a format argument at all (which means the string passed is constant, so no need to use printf at all - however, there are two separate tests here with different length arguments passed to re_compile_pattern, so it *does* make sense to make the strings used different so that in the event of failure it's clear which one of the tests failed). Tested with build-many-glibcs.py with GCC mainline for aarch64-linux-gnu. * posix/bug-regex22.c (main): Use puts with distinct error messages for unexpected success of re_compile_pattern, not printf with NULL argument to %s. --- ChangeLog | 4 ++++ posix/bug-regex22.c | 8 ++++---- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/ChangeLog b/ChangeLog index 0c6b43ebc0..83a28dbb2f 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,9 @@ 2018-11-01 Joseph Myers + * posix/bug-regex22.c (main): Use puts with distinct error + messages for unexpected success of re_compile_pattern, not printf + with NULL argument to %s. + * stdio-common/bug22.c: Include . (do_test): Disable -Wformat-overflow= warnings around fprintf calls outputting more than INT_MAX characters. diff --git a/posix/bug-regex22.c b/posix/bug-regex22.c index 2c561d8e43..73b222cbff 100644 --- a/posix/bug-regex22.c +++ b/posix/bug-regex22.c @@ -99,8 +99,8 @@ main (void) s = re_compile_pattern ("[[:DIGIT:]]", 11, &re); if (s == NULL) { - printf ("compilation of \"[[:DIGIT:]]\" pattern unexpectedly succeeded: %s\n", - s); + puts ("compilation of \"[[:DIGIT:]]\" pattern unexpectedly succeeded: " + "length 11"); result = 1; } @@ -109,8 +109,8 @@ main (void) s = re_compile_pattern ("[[:DIGIT:]]", 2, &re); if (s == NULL) { - printf ("compilation of \"[[:DIGIT:]]\" pattern unexpectedly succeeded: %s\n", - s); + puts ("compilation of \"[[:DIGIT:]]\" pattern unexpectedly succeeded: " + "length 2"); result = 1; }