1 /*
2 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "tests.h"
29 #include <stdio.h>
30
31 enum sprintrc_fmt {
32 SPRINTRC_FMT_RAW,
33 SPRINTRC_FMT_GREP,
34 };
35
36 /**
37 * Provides pointer to static string buffer with printed return code in format
38 * used by strace - with errno and error message.
39 *
40 * @param rc Return code.
41 * @param fmt Output format. Currently, raw (used for diff matching) and grep
42 * (for extended POSIX regex-based pattern matching) formats are
43 * supported.
44 * @return Pointer to (statically allocated) buffer containing decimal
45 * representation of return code and errno/error message in case @rc
46 * is equal to -1.
47 */
48 static inline const char *
sprintrc_ex(long rc,enum sprintrc_fmt fmt)49 sprintrc_ex(long rc, enum sprintrc_fmt fmt)
50 {
51 static const char *formats[] = {
52 [SPRINTRC_FMT_RAW] = "-1 %s (%m)",
53 [SPRINTRC_FMT_GREP] = "-1 %s \\(%m\\)",
54 };
55 static char buf[4096];
56
57 if (fmt >= ARRAY_SIZE(formats))
58 perror_msg_and_fail("sprintrc_ex: incorrect format provided");
59
60 if (rc == 0)
61 return "0";
62
63 int ret = (rc == -1)
64 ? snprintf(buf, sizeof(buf), formats[fmt], errno2name())
65 : snprintf(buf, sizeof(buf), "%ld", rc);
66
67 if (ret < 0)
68 perror_msg_and_fail("snprintf");
69 if ((size_t) ret >= sizeof(buf))
70 error_msg_and_fail("snprintf overflow: got %d, expected"
71 " no more than %zu", ret, sizeof(buf));
72
73 return buf;
74 }
75
76 const char *
sprintrc(long rc)77 sprintrc(long rc)
78 {
79 return sprintrc_ex(rc, SPRINTRC_FMT_RAW);
80 }
81
82 const char *
sprintrc_grep(long rc)83 sprintrc_grep(long rc)
84 {
85 return sprintrc_ex(rc, SPRINTRC_FMT_GREP);
86 }
87