Dmitry V. Levin
c6782f144a
strace test suite is now provided under the terms of the GNU General Public License version 2 or later, see tests/COPYING for more details.
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/*
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* Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
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* Copyright (c) 2016-2018 The strace developers.
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "tests.h"
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#include <stdio.h>
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enum sprintrc_fmt {
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SPRINTRC_FMT_RAW,
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SPRINTRC_FMT_GREP,
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};
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/**
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* Provides pointer to static string buffer with printed return code in format
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* used by strace - with errno and error message.
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*
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* @param rc Return code.
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* @param fmt Output format. Currently, raw (used for diff matching) and grep
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* (for extended POSIX regex-based pattern matching) formats are
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* supported.
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* @return Pointer to (statically allocated) buffer containing decimal
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* representation of return code and errno/error message in case @rc
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* is equal to -1.
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*/
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static inline const char *
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sprintrc_ex(long rc, enum sprintrc_fmt fmt)
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{
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static const char *formats[] = {
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[SPRINTRC_FMT_RAW] = "-1 %s (%m)",
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[SPRINTRC_FMT_GREP] = "-1 %s \\(%m\\)",
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};
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static char buf[4096];
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if (rc == 0)
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return "0";
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int ret = (rc == -1)
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? snprintf(buf, sizeof(buf), formats[fmt], errno2name())
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: snprintf(buf, sizeof(buf), "%ld", rc);
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if (ret < 0)
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perror_msg_and_fail("snprintf");
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if ((size_t) ret >= sizeof(buf))
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error_msg_and_fail("snprintf overflow: got %d, expected"
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" no more than %zu", ret, sizeof(buf));
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return buf;
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}
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const char *
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sprintrc(long rc)
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{
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return sprintrc_ex(rc, SPRINTRC_FMT_RAW);
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}
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const char *
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sprintrc_grep(long rc)
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{
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return sprintrc_ex(rc, SPRINTRC_FMT_GREP);
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}
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