about summary refs log tree commit diff
path: root/stdio-common/tst-fmemopen2.c
blob: 16dd3ad73dc1d23a12ab1660db2518cb6df4de85 (plain) (blame)
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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/* fmemopen tests.
   Copyright (C) 2015 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

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


#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <errno.h>

/* Check fmemopen with user provided buffer open for write.  */
static int
do_test_with_buffer (void)
{
  int result = 0;
  char buf[100];
  const size_t nbuf = sizeof (buf);

  FILE *fp = fmemopen (buf, nbuf, "w");
  if (fp == NULL)
    {
      printf ("FAIL: fmemopen failedi (%s)\n", __FUNCTION__);
      return 1;
    }

  /* Default write operation, check if file position is correct after it.  */
  static const char str[] = "hello world";
  const size_t nstr = sizeof (str) - 1;
  fputs (str, fp);
  off_t o = ftello (fp);
  if (o != nstr)
    {
      printf ("FAIL: first ftello returned %jd, expected %zu\n",
	      (intmax_t)o, nstr);
      result = 1;
    }

  /* Rewind stream and seek tests, the position size should be equal to
     buffer size provided in open function.  */
  rewind (fp);
  o = ftello (fp);
  if (o != 0)
    {
      printf ("FAIL: second ftello returned %jd, expected 0\n",
	      (intmax_t)o);
      result = 1;
    }
  if (fseeko (fp, 0, SEEK_END) != 0)
    {
      printf ("FAIL: fseeko failed\n");
      result = 1;
    }
  o = ftello (fp);
  if (o != nstr)
    {
      printf ("FAIL: third ftello returned %jd, expected %zu\n",
	      (intmax_t)o, nbuf);
      result = 1;
    }

  /* Rewind the stream and recheck by using a shorter string.  */
  rewind (fp);
  static const char str2[] = "just hello";
  const size_t nstr2 = sizeof (str2) - 1;
  assert (nstr2 < nstr);
  fputs (str2, fp);
  o = ftello (fp);
  if (o != nstr2)
    {
      printf ("FAIL: fourth ftello returned %jd, expected %zu\n",
	      (intmax_t)o, nstr2);
      result = 1;
    }
  fclose (fp);

  /* Again, but now with a larger string.  */
  static const char str3[] = "just hellod";
  if (strcmp (buf, str3) != 0)
    {
      printf ("FAIL: final string is \"%s\", expected \"%s\"\n",
              buf, str3);
      result = 1;
    }
  return result;
}

/* Check fmemopen without user provided buffer open for write.  */
static int
do_test_without_buffer (void)
{
  int result = 0;
  const size_t nbuf = 100;

  FILE *fp = fmemopen (NULL, nbuf, "w");
  if (fp == NULL)
    {
      printf ("FAIL: fmemopen failed (%s)\n", __FUNCTION__);
      return 1;
    }

  static const char str[] = "hello world";
  const size_t nstr = sizeof (str) - 1;

  /* Default write operation, check if file position is correct after it.  */
  fputs (str, fp);
  off_t o = ftello (fp);
  if (o != nstr)
    {
      printf ("FAIL: first ftello returned %jd, expected %zu\n",
	      (intmax_t) o, nstr);
      result = 1;
    }
  if (fseeko (fp, 0, SEEK_END) != 0)
    {
      printf ("FAIL: fseeko failed\n");
      result = 1;
    }
  o = ftello (fp);
  if (o != nstr)
    {
      printf ("FAIL: second ftello returned %jd, expected %zu\n",
	      (intmax_t) o, nbuf);
      result = 1;
    }

  /* Rewind the stream and recheck by using a shorter string.  */
  rewind (fp);
  static const char str2[] = "just hello";
  const size_t nstr2 = sizeof (str2) - 1;
  assert (nstr2 < nstr);
  fputs (str2, fp);
  o = ftello (fp);
  if (o != nstr2)
    {
      printf ("FAIL: third ftello returned %jd, expected %zu\n",
	      (intmax_t) o, nstr2);
      result = 1;
    }
  fclose (fp);

  return result;
}

/* Check fmemopen with a buffer lenght of zero.  */
static int
do_test_length_zero (void)
{
  int result = 0;
  FILE *fp;
#define BUFCONTENTS "testing buffer"
  char buf[100] = BUFCONTENTS;
  const size_t nbuf = 0;
  int r;

  fp = fmemopen (buf, nbuf, "r");
  if (fp == NULL)
    {
      printf ("FAIL: fmemopen failed (%s)\n", __FUNCTION__);
      return 1;
    }

  /* Reading any data on a zero-length buffer should return EOF.  */
  if ((r = fgetc (fp)) != EOF)
    {
      printf ("FAIL: fgetc on a zero-length returned: %d\n", r);
      result = 1;
    }
  off_t o = ftello (fp);
  if (o != 0)
    {
      printf ("FAIL: first ftello returned %jd, expected 0\n",
	      (intmax_t) o);
      result = 1;
    }
  fclose (fp);

  /* Writing any data shall start at current position and shall not pass
     current buffer size beyond the size in fmemopen call.  */
  fp = fmemopen (buf, nbuf, "w");
  if (fp == NULL)
    {
      printf ("FAIL: second fmemopen failed (%s)\n", __FUNCTION__);
      return 1;
    }

  static const char str[] = "hello world";
  /* Because of buffering, the fputs call itself will not fail. However the
     final buffer should be not changed because length 0 was passed to the
     fmemopen call.  */
  fputs (str, fp);
  r = 0;
  errno = 0;
  if (fflush (fp) != EOF)
    {
      printf ("FAIL: fflush did not return EOF\n");
      fclose (fp);
      return 1;
    }
  if (errno != ENOSPC)
    {
      printf ("FAIL: errno is %i (expected ENOSPC)\n", errno);
      fclose (fp);
      return 1;
    }

  fclose (fp);

  if (strcmp (buf, BUFCONTENTS) != 0)
    {
      printf ("FAIL: strcmp (%s, %s) failed\n", buf, BUFCONTENTS);
      return 1;
    }

  /* Different than 'w' mode, 'w+' truncates the buffer.  */
  fp = fmemopen (buf, nbuf, "w+");
  if (fp == NULL)
    {
      printf ("FAIL: third fmemopen failed (%s)\n", __FUNCTION__);
      return 1;
    }

  fclose (fp);

  if (strcmp (buf, "") != 0)
    {
      printf ("FAIL: strcmp (%s, \"\") failed\n", buf);
      return 1;
    }

  return result;
}

static int
do_test (void)
{
  int ret = 0;

  ret += do_test_with_buffer ();
  ret += do_test_without_buffer ();
  ret += do_test_length_zero ();

  return ret;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"