File: test-strerror_r.c

package info (click to toggle)
id-utils 4.6.28-20200521ss15dab
  • links: PTS
  • area: main
  • in suites: bookworm, bullseye, sid, trixie
  • size: 13,176 kB
  • sloc: ansic: 90,321; sh: 10,115; perl: 558; makefile: 209; lisp: 29; sed: 16
file content (181 lines) | stat: -rw-r--r-- 5,079 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
/* Test of strerror_r() function.
   Copyright (C) 2007-2020 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

#include <string.h>

#include "signature.h"
SIGNATURE_CHECK (strerror_r, int, (int, char *, size_t));

#include <errno.h>

#include "macros.h"

int
main (void)
{
  char buf[100];
  int ret;

  /* Test results with valid errnum and enough room.  */

  errno = 0;
  buf[0] = '\0';
  ASSERT (strerror_r (EACCES, buf, sizeof buf) == 0);
  ASSERT (buf[0] != '\0');
  ASSERT (errno == 0);
  ASSERT (strlen (buf) < sizeof buf);

  errno = 0;
  buf[0] = '\0';
  ASSERT (strerror_r (ETIMEDOUT, buf, sizeof buf) == 0);
  ASSERT (buf[0] != '\0');
  ASSERT (errno == 0);
  ASSERT (strlen (buf) < sizeof buf);

  errno = 0;
  buf[0] = '\0';
  ASSERT (strerror_r (EOVERFLOW, buf, sizeof buf) == 0);
  ASSERT (buf[0] != '\0');
  ASSERT (errno == 0);
  ASSERT (strlen (buf) < sizeof buf);

  /* POSIX requires strerror (0) to succeed.  Reject use of "Unknown
     error", but allow "Success", "No error", or even Solaris' "Error
     0" which are distinct patterns from true out-of-range strings.
     http://austingroupbugs.net/view.php?id=382  */
  errno = 0;
  buf[0] = '\0';
  ret = strerror_r (0, buf, sizeof buf);
  ASSERT (ret == 0);
  ASSERT (buf[0]);
  ASSERT (errno == 0);
  ASSERT (strstr (buf, "nknown") == NULL);
  ASSERT (strstr (buf, "ndefined") == NULL);

  /* Test results with out-of-range errnum and enough room.  POSIX
     allows an empty string on success, and allows an unchanged buf on
     error, but these are not useful, so we guarantee contents.  */
  errno = 0;
  buf[0] = '^';
  ret = strerror_r (-3, buf, sizeof buf);
  ASSERT (ret == 0 || ret == EINVAL);
  ASSERT (buf[0] != '^');
  ASSERT (*buf);
  ASSERT (errno == 0);
  ASSERT (strlen (buf) < sizeof buf);

  /* Test results with a too small buffer.  POSIX requires an error;
     only ERANGE for 0 and valid errors, and a choice of ERANGE or
     EINVAL for out-of-range values.  On error, POSIX permits buf to
     be empty, unchanged, or unterminated, but these are not useful,
     so we guarantee NUL-terminated truncated contents for all but
     size 0.  http://austingroupbugs.net/view.php?id=398.  Also ensure
     that no out-of-bounds writes occur.  */
  {
    int errs[] = { EACCES, 0, -3, };
    int j;

    buf[sizeof buf - 1] = '\0';
    for (j = 0; j < SIZEOF (errs); j++)
      {
        int err = errs[j];
        char buf2[sizeof buf] = "";
        size_t len;
        size_t i;

        strerror_r (err, buf2, sizeof buf2);
        len = strlen (buf2);
        ASSERT (len < sizeof buf);

        for (i = 0; i <= len; i++)
          {
            memset (buf, '^', sizeof buf - 1);
            errno = 0;
            ret = strerror_r (err, buf, i);
            ASSERT (errno == 0);
            if (j == 2)
              ASSERT (ret == ERANGE || ret == EINVAL);
            else
              ASSERT (ret == ERANGE);
            if (i)
              {
                ASSERT (strncmp (buf, buf2, i - 1) == 0);
                ASSERT (buf[i - 1] == '\0');
              }
            ASSERT (strspn (buf + i, "^") == sizeof buf - 1 - i);
          }

        strcpy (buf, "BADFACE");
        errno = 0;
        ret = strerror_r (err, buf, len + 1);
        ASSERT (ret != ERANGE);
        ASSERT (errno == 0);
        ASSERT (strcmp (buf, buf2) == 0);
      }
  }

#if GNULIB_STRERROR
  /* Test that strerror_r does not clobber strerror buffer.  On some
     platforms, this test can only succeed if gnulib also replaces
     strerror.  */
  {
    const char *msg1;
    const char *msg2;
    const char *msg3;
    const char *msg4;
    char *str1;
    char *str2;
    char *str3;
    char *str4;

    msg1 = strerror (ENOENT);
    ASSERT (msg1);
    str1 = strdup (msg1);
    ASSERT (str1);

    msg2 = strerror (ERANGE);
    ASSERT (msg2);
    str2 = strdup (msg2);
    ASSERT (str2);

    msg3 = strerror (-4);
    ASSERT (msg3);
    str3 = strdup (msg3);
    ASSERT (str3);

    msg4 = strerror (1729576);
    ASSERT (msg4);
    str4 = strdup (msg4);
    ASSERT (str4);

    strerror_r (EACCES, buf, sizeof buf);
    strerror_r (-5, buf, sizeof buf);
    ASSERT (msg1 == msg2 || msg1 == msg4 || STREQ (msg1, str1));
    ASSERT (msg2 == msg4 || STREQ (msg2, str2));
    ASSERT (msg3 == msg4 || STREQ (msg3, str3));
    ASSERT (STREQ (msg4, str4));

    free (str1);
    free (str2);
    free (str3);
    free (str4);
  }
#endif

  return 0;
}