1// Licensed to the .NET Foundation under one or more agreements.
2// The .NET Foundation licenses this file to you under the MIT license.
3// See the LICENSE file in the project root for more information.
4
5/*=====================================================================
6**
7** Source: test2.c
8**
9** Purpose: Tests the PAL implementation of the fread function.
10** Open a file in READ mode, and then try to read all
11** the characters, more than all the characters,
12** 0 characters and 0 sized characters and check that
13** the strings read in are correct.
14**
15** Depends:
16** fopen
17** fseek
18** fclose
19** strcmp
20** memset
21**
22**
23**===================================================================*/
24
25/* Note: testfile should exist in the directory with 15 characters
26 in it ... something got lost if it isn't here.
27*/
28
29/* Note: The behaviour in win32 is to crash if a NULL pointer is passed to
30 fread, so the test to check that it returns 0 has been removed.
31*/
32
33#include <palsuite.h>
34
35int __cdecl main(int argc, char **argv)
36{
37 const char filename[] = "testfile";
38 char buffer[128];
39 FILE * fp = NULL;
40
41 if (0 != PAL_Initialize(argc, argv))
42 {
43 return FAIL;
44 }
45
46 /* Open a file in READ mode */
47
48 if((fp = fopen(filename, "r")) == NULL)
49 {
50 Fail("Unable to open a file for reading. Is the file "
51 "in the directory? It should be.");
52 }
53
54 /* Read 15 characters from the file. The file has exactly this many
55 in it. Then check to see that the data read in is correct.
56 Note: The 'testfile' should have "This is a test." written in it.
57 */
58 memset(buffer,'\0',128);
59 fread(buffer,1,15,fp);
60
61 if(strcmp(buffer,"This is a test.") != 0)
62 {
63 Fail("ERROR: The data read in should have been "
64 "'This is a test.' but, the buffer contains '%s'.",
65 buffer);
66 }
67
68 /* Go back to the start of the file */
69
70 if(fseek(fp, 0, SEEK_SET))
71 {
72 Fail("ERROR: fseek failed, and this test depends on it.");
73 }
74
75 /* Attempt to read 17 characters. The same 15 characters should
76 be in the buffer.
77 */
78
79 memset(buffer,'\0',128);
80 fread(buffer,1,17,fp);
81
82 if(strcmp(buffer,"This is a test.") != 0)
83 {
84 Fail("ERROR: The data read in should have been "
85 "'This is a test.' but, the buffer contains '%s'.",
86 buffer);
87 }
88
89 /* Back to the start of the file */
90
91 if(fseek(fp, 0, SEEK_SET))
92 {
93 Fail("ERROR: fseek failed, and this test depends on it.");
94 }
95
96 /* Read 0 characters and ensure the buffer is empty */
97
98 memset(buffer,'\0',128);
99 fread(buffer,1,0,fp);
100
101 if(strcmp(buffer,"\0") != 0)
102 {
103 Fail("ERROR: The data read in should have been "
104 "NULL but, the buffer contains '%s'.",
105 buffer);
106 }
107
108 /* Read characters of 0 size and ensure the buffer is empty */
109
110 memset(buffer,'\0',128);
111 fread(buffer,0,5,fp);
112
113 if(strcmp(buffer,"\0") != 0)
114 {
115 Fail("ERROR: The data read in should have been "
116 "NULL but, the buffer contains '%s'.",
117 buffer);
118 }
119
120 /* Close the file */
121
122 if(fclose(fp))
123 {
124 Fail("ERROR: fclose failed. Test depends on it.");
125 }
126
127 /* Read 5 characters of 1 size from a closed file pointer
128 and ensure the buffer is empty
129 */
130 memset(buffer,'\0',128);
131 fread(buffer,1,5,fp);
132 if(strcmp(buffer,"\0") != 0)
133 {
134 Fail("ERROR: The data read in should have been "
135 "NULL but, the buffer contains '%s'.",
136 buffer);
137 }
138
139 PAL_Terminate();
140 return PASS;
141}
142
143
144