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/*
* Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
* Copyright (c) 2016-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <stdio.h>
enum sprintrc_fmt {
SPRINTRC_FMT_RAW,
SPRINTRC_FMT_GREP,
};
/**
* Provides pointer to static string buffer with printed return code in format
* used by strace - with errno and error message.
*
* @param rc Return code.
* @param fmt Output format. Currently, raw (used for diff matching) and grep
* (for extended POSIX regex-based pattern matching) formats are
* supported.
* @return Pointer to (statically allocated) buffer containing decimal
* representation of return code and errno/error message in case @rc
* is equal to -1.
*/
static const char *
sprintrc_ex(long rc, enum sprintrc_fmt fmt)
{
static const char *formats[] = {
[SPRINTRC_FMT_RAW] = "-1 %s (%m)",
[SPRINTRC_FMT_GREP] = "-1 %s \\(%m\\)",
};
static char buf[4096];
if (rc == 0)
return "0";
int ret = (rc == -1)
? snprintf(buf, sizeof(buf), formats[fmt], errno2name())
: snprintf(buf, sizeof(buf), "%ld", rc);
if (ret < 0)
perror_msg_and_fail("snprintf");
if ((size_t) ret >= sizeof(buf))
error_msg_and_fail("snprintf overflow: got %d, expected"
" no more than %zu", ret, sizeof(buf));
return buf;
}
const char *
sprintrc(long rc)
{
return sprintrc_ex(rc, SPRINTRC_FMT_RAW);
}
const char *
sprintrc_grep(long rc)
{
return sprintrc_ex(rc, SPRINTRC_FMT_GREP);
}
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