9702a7901e
%#m prints errno as an error constant if one is available, or a decimal number as a fallback. This intends to address the gap that strerrorname_np does not work well with printf for unknown error codes due to its NULL return values in those cases. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/* Test the %m, %#m printf specifiers via asprintf.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <libc-diag.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/support.h>
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/* GCC does not yet know about the %#m specifier. */
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DIAG_PUSH_NEEDS_COMMENT;
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DIAG_IGNORE_NEEDS_COMMENT (11, "-Wformat=");
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static int
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do_test (void)
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{
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char buf[64];
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errno = EINVAL;
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TEST_COMPARE (sprintf (buf, "%m"), 16);
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TEST_COMPARE_STRING (buf, "Invalid argument");
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errno = EINVAL;
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TEST_COMPARE (sprintf (buf, "%#m"), 6);
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TEST_COMPARE_STRING (buf, "EINVAL");
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errno = 0;
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TEST_COMPARE (sprintf (buf, "%m"), 7);
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TEST_COMPARE_STRING (buf, "Success");
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errno = 0;
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TEST_COMPARE (sprintf (buf, "%#m"), 1);
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TEST_COMPARE_STRING (buf, "0");
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errno = -1;
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TEST_COMPARE (sprintf (buf, "%m"), 16);
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TEST_COMPARE_STRING (buf, "Unknown error -1");
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errno = -1;
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TEST_COMPARE (sprintf (buf, "%#m"), 2);
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TEST_COMPARE_STRING (buf, "-1");
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errno = 1002003;
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TEST_COMPARE (sprintf (buf, "%m"), 21);
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TEST_COMPARE_STRING (buf, "Unknown error 1002003");
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errno = 1002003;
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TEST_COMPARE (sprintf (buf, "%#m"), 7);
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TEST_COMPARE_STRING (buf, "1002003");
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errno = EINVAL;
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TEST_COMPARE (sprintf (buf, "%20m"), 20);
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TEST_COMPARE_STRING (buf, " Invalid argument");
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errno = EINVAL;
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TEST_COMPARE (sprintf (buf, "%#20m"), 20);
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TEST_COMPARE_STRING (buf, " EINVAL");
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errno = EINVAL;
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TEST_COMPARE (sprintf (buf, "%-20m"), 20);
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TEST_COMPARE_STRING (buf, "Invalid argument ");
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errno = EINVAL;
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TEST_COMPARE (sprintf (buf, "%-#20m"), 20);
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TEST_COMPARE_STRING (buf, "EINVAL ");
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errno = 0;
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TEST_COMPARE (sprintf (buf, "%-20m"), 20);
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TEST_COMPARE_STRING (buf, "Success ");
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errno = 0;
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TEST_COMPARE (sprintf (buf, "%-#20m"), 20);
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TEST_COMPARE_STRING (buf, "0 ");
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return 0;
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}
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#include <support/test-driver.c>
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