1 /*
2 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
3 * Copyright (c) 2016-2018 The strace developers.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "tests.h"
30 #include <stdio.h>
31
32 enum sprintrc_fmt {
33 SPRINTRC_FMT_RAW,
34 SPRINTRC_FMT_GREP,
35 };
36
37 /**
38 * Provides pointer to static string buffer with printed return code in format
39 * used by strace - with errno and error message.
40 *
41 * @param rc Return code.
42 * @param fmt Output format. Currently, raw (used for diff matching) and grep
43 * (for extended POSIX regex-based pattern matching) formats are
44 * supported.
45 * @return Pointer to (statically allocated) buffer containing decimal
46 * representation of return code and errno/error message in case @rc
47 * is equal to -1.
48 */
49 static inline const char *
sprintrc_ex(long rc,enum sprintrc_fmt fmt)50 sprintrc_ex(long rc, enum sprintrc_fmt fmt)
51 {
52 static const char *formats[] = {
53 [SPRINTRC_FMT_RAW] = "-1 %s (%m)",
54 [SPRINTRC_FMT_GREP] = "-1 %s \\(%m\\)",
55 };
56 static char buf[4096];
57
58 if (rc == 0)
59 return "0";
60
61 int ret = (rc == -1)
62 ? snprintf(buf, sizeof(buf), formats[fmt], errno2name())
63 : snprintf(buf, sizeof(buf), "%ld", rc);
64
65 if (ret < 0)
66 perror_msg_and_fail("snprintf");
67 if ((size_t) ret >= sizeof(buf))
68 error_msg_and_fail("snprintf overflow: got %d, expected"
69 " no more than %zu", ret, sizeof(buf));
70
71 return buf;
72 }
73
74 const char *
sprintrc(long rc)75 sprintrc(long rc)
76 {
77 return sprintrc_ex(rc, SPRINTRC_FMT_RAW);
78 }
79
80 const char *
sprintrc_grep(long rc)81 sprintrc_grep(long rc)
82 {
83 return sprintrc_ex(rc, SPRINTRC_FMT_GREP);
84 }
85