mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 15:20:10 +00:00
2084e7ca4d
In <https://sourceware.org/ml/libc-alpha/2014-11/msg00326.html>, Roland requested internal macros for use of "#pragma GCC diagnostic". This patch adds such macros and uses them to disable -Wformat warnings for some code testing GNU scanf %as where GCC expects C99 scanf %a (several other stdio tests currently use -Wno-format to disable warnings). Limitations in GCC's diagnostic pragmas require separate macros before and after the code generating the warnings, rather than a single macro taking that code as an argument. The macros are named DIAG_*_NEEDS_COMMENT to emphasise to reviewers the need for a comment accompanying any use of them (such comments may however just appear once for several uses of the macros for the same issue in the same file). I put a GCC version in the arguments to DIAG_IGNORE_NEEDS_COMMENT, as that seems something useful to grep for when obsoleting support for an old GCC version and needing to decide if warning-disabling code is still relevant. These macros should be usable for replacing existing -Wno-* use in makefiles (as also suggested by Roland), though I have no plans to work on that (only on use of the macros in cases where warnings are currently present that need disabling to use -Werror). Tested for x86_64. * include/libc-internal.h (DIAG_PUSH_NEEDS_COMMENT): New macro. (DIAG_POP_NEEDS_COMMENT): Likewise. (_DIAG_STR1): Likewise. (_DIAG_STR): Likewise. (DIAG_IGNORE_NEEDS_COMMENT): Likewise. * stdio-common/bug21.c: Include <libc-internal.h>. (do_test): Disable -Wformat around call to sscanf. * stdio-common/scanf14.c: Include <libc-internal.h>. (main): Disable -Wformat around some calls to scanf functions.
138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <wchar.h>
|
|
#include <libc-internal.h>
|
|
|
|
#define FAIL() \
|
|
do { \
|
|
result = 1; \
|
|
printf ("test at line %d failed\n", __LINE__); \
|
|
} while (0)
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
wchar_t *lsp;
|
|
char *sp;
|
|
float f;
|
|
double d;
|
|
char c[8];
|
|
int result = 0;
|
|
|
|
if (sscanf (" 0.25s x", "%e%3c", &f, c) != 2)
|
|
FAIL ();
|
|
else if (f != 0.25 || memcmp (c, "s x", 3) != 0)
|
|
FAIL ();
|
|
/* GCC in C99 mode treats %a as the C99 format expecting float *,
|
|
but glibc with _GNU_SOURCE treats %as as the GNU allocation
|
|
extension, so resulting in "warning: format '%a' expects argument
|
|
of type 'float *', but argument 3 has type 'char **'". This
|
|
applies to the other %as, %aS and %a[] formats below as well. */
|
|
DIAG_PUSH_NEEDS_COMMENT;
|
|
DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat");
|
|
if (sscanf (" 1.25s x", "%as%2c", &sp, c) != 2)
|
|
FAIL ();
|
|
else
|
|
{
|
|
if (strcmp (sp, "1.25s") != 0 || memcmp (c, " x", 2) != 0)
|
|
FAIL ();
|
|
memset (sp, 'x', sizeof "1.25s");
|
|
free (sp);
|
|
}
|
|
DIAG_POP_NEEDS_COMMENT;
|
|
if (sscanf (" 2.25s x", "%las%2c", &d, c) != 2)
|
|
FAIL ();
|
|
else if (d != 2.25 || memcmp (c, " x", 2) != 0)
|
|
FAIL ();
|
|
/* See explanation above. */
|
|
DIAG_PUSH_NEEDS_COMMENT;
|
|
DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat");
|
|
if (sscanf (" 3.25S x", "%4aS%3c", &lsp, c) != 2)
|
|
FAIL ();
|
|
else
|
|
{
|
|
if (wcscmp (lsp, L"3.25") != 0 || memcmp (c, "S x", 3) != 0)
|
|
FAIL ();
|
|
memset (lsp, 'x', sizeof L"3.25");
|
|
free (lsp);
|
|
}
|
|
if (sscanf ("4.25[0-9.] x", "%a[0-9.]%8c", &sp, c) != 2)
|
|
FAIL ();
|
|
else
|
|
{
|
|
if (strcmp (sp, "4.25") != 0 || memcmp (c, "[0-9.] x", 8) != 0)
|
|
FAIL ();
|
|
memset (sp, 'x', sizeof "4.25");
|
|
free (sp);
|
|
}
|
|
DIAG_POP_NEEDS_COMMENT;
|
|
if (sscanf ("5.25[0-9.] x", "%la[0-9.]%2c", &d, c) != 2)
|
|
FAIL ();
|
|
else if (d != 5.25 || memcmp (c, " x", 2) != 0)
|
|
FAIL ();
|
|
|
|
const char *tmpdir = getenv ("TMPDIR");
|
|
if (tmpdir == NULL || tmpdir[0] == '\0')
|
|
tmpdir = "/tmp";
|
|
|
|
char fname[strlen (tmpdir) + sizeof "/tst-scanf14.XXXXXX"];
|
|
sprintf (fname, "%s/tst-scanf14.XXXXXX", tmpdir);
|
|
if (fname == NULL)
|
|
FAIL ();
|
|
|
|
/* Create a temporary file. */
|
|
int fd = mkstemp (fname);
|
|
if (fd == -1)
|
|
FAIL ();
|
|
|
|
FILE *fp = fdopen (fd, "w+");
|
|
if (fp == NULL)
|
|
FAIL ();
|
|
else
|
|
{
|
|
if (fputs (" 1.25s x", fp) == EOF)
|
|
FAIL ();
|
|
if (fseek (fp, 0, SEEK_SET) != 0)
|
|
FAIL ();
|
|
/* See explanation above. */
|
|
DIAG_PUSH_NEEDS_COMMENT;
|
|
DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat");
|
|
if (fscanf (fp, "%as%2c", &sp, c) != 2)
|
|
FAIL ();
|
|
else
|
|
{
|
|
if (strcmp (sp, "1.25s") != 0 || memcmp (c, " x", 2) != 0)
|
|
FAIL ();
|
|
memset (sp, 'x', sizeof "1.25s");
|
|
free (sp);
|
|
}
|
|
DIAG_POP_NEEDS_COMMENT;
|
|
|
|
if (freopen (fname, "r", stdin) == NULL)
|
|
FAIL ();
|
|
else
|
|
{
|
|
/* See explanation above. */
|
|
DIAG_PUSH_NEEDS_COMMENT;
|
|
DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat");
|
|
if (scanf ("%as%2c", &sp, c) != 2)
|
|
FAIL ();
|
|
else
|
|
{
|
|
if (strcmp (sp, "1.25s") != 0 || memcmp (c, " x", 2) != 0)
|
|
FAIL ();
|
|
memset (sp, 'x', sizeof "1.25s");
|
|
free (sp);
|
|
}
|
|
DIAG_POP_NEEDS_COMMENT;
|
|
}
|
|
|
|
fclose (fp);
|
|
}
|
|
|
|
remove (fname);
|
|
|
|
return result;
|
|
}
|