1 | #include <errno.h> |
2 | #include <stdio.h> |
3 | #include <stdlib.h> |
4 | #include <unistd.h> |
5 | |
6 | |
7 | static char fname[] = "/tmp/rndseek.XXXXXX" ; |
8 | static char tempdata[65 * 1024]; |
9 | |
10 | |
11 | static int do_test (void); |
12 | #define TEST_FUNCTION do_test () |
13 | |
14 | #include "../test-skeleton.c" |
15 | |
16 | |
17 | static int |
18 | fp_test (const char *name, FILE *fp) |
19 | { |
20 | int result = 0; |
21 | int rounds = 10000; |
22 | |
23 | do |
24 | { |
25 | int idx = random () % (sizeof (tempdata) - 2); |
26 | char ch1; |
27 | char ch2; |
28 | |
29 | if (fseek (fp, idx, SEEK_SET) != 0) |
30 | { |
31 | printf (format: "%s: %d: fseek failed: %m\n" , name, rounds); |
32 | result = 1; |
33 | break; |
34 | } |
35 | |
36 | ch1 = fgetc_unlocked (fp: fp); |
37 | ch2 = tempdata[idx]; |
38 | if (ch1 != ch2) |
39 | { |
40 | printf (format: "%s: %d: character at index %d not what is expected ('%c' vs '%c')\n" , |
41 | name, rounds, idx, ch1, ch2); |
42 | result = 1; |
43 | break; |
44 | } |
45 | |
46 | ch1 = fgetc (stream: fp); |
47 | ch2 = tempdata[idx + 1]; |
48 | if (ch1 != ch2) |
49 | { |
50 | printf (format: "%s: %d: character at index %d not what is expected ('%c' vs '%c')\n" , |
51 | name, rounds, idx + 1, ch1, ch2); |
52 | result = 1; |
53 | break; |
54 | } |
55 | } |
56 | while (--rounds > 0); |
57 | |
58 | fclose (fp); |
59 | |
60 | return result; |
61 | } |
62 | |
63 | |
64 | static int |
65 | do_test (void) |
66 | { |
67 | int fd; |
68 | FILE *fp; |
69 | size_t i; |
70 | int result; |
71 | |
72 | fd = mkstemp (template: fname); |
73 | if (fd == -1) |
74 | { |
75 | printf (format: "cannot open temporary file: %m\n" ); |
76 | return 1; |
77 | } |
78 | /* Make sure the file gets removed. */ |
79 | add_temp_file (name: fname); |
80 | |
81 | /* Repeatability demands this. */ |
82 | srandom (seed: 42); |
83 | |
84 | /* First create some temporary data. */ |
85 | for (i = 0; i < sizeof (tempdata); ++i) |
86 | tempdata[i] = 'a' + random () % 26; |
87 | |
88 | /* Write this data to a file. */ |
89 | if (TEMP_FAILURE_RETRY (write (fd, tempdata, sizeof (tempdata))) |
90 | != sizeof (tempdata)) |
91 | { |
92 | printf (format: "cannot wrote data to temporary file: %m\n" ); |
93 | return 1; |
94 | } |
95 | |
96 | /* Now try reading the data. */ |
97 | fp = fdopen (dup (fd), "r" ); |
98 | if (fp == NULL) |
99 | { |
100 | printf (format: "cannot duplicate temporary file descriptor: %m\n" ); |
101 | return 1; |
102 | } |
103 | |
104 | rewind (fp); |
105 | for (i = 0; i < sizeof (tempdata); ++i) |
106 | { |
107 | int ch0 = fgetc (stream: fp); |
108 | char ch1 = ch0; |
109 | char ch2 = tempdata[i]; |
110 | |
111 | if (ch0 == EOF) |
112 | { |
113 | puts (s: "premature end of file while reading data" ); |
114 | return 1; |
115 | } |
116 | |
117 | if (ch1 != ch2) |
118 | { |
119 | printf (format: "%zd: '%c' vs '%c'\n" , i, ch1, ch2); |
120 | return 1; |
121 | } |
122 | } |
123 | |
124 | result = fp_test (name: "fdopen(\"r\")" , fp); |
125 | |
126 | fp = fopen (fname, "r" ); |
127 | result |= fp_test (name: "fopen(\"r\")" , fp); |
128 | |
129 | fp = fopen64 (filename: fname, modes: "r" ); |
130 | result |= fp_test (name: "fopen64(\"r\")" , fp); |
131 | |
132 | /* The "rw" mode will prevent the mmap-using code from being used. */ |
133 | fp = fdopen (fd, "rw" ); |
134 | result = fp_test (name: "fdopen(\"rw\")" , fp); |
135 | |
136 | fp = fopen (fname, "rw" ); |
137 | result |= fp_test (name: "fopen(\"rw\")" , fp); |
138 | |
139 | fp = fopen64 (filename: fname, modes: "rw" ); |
140 | result |= fp_test (name: "fopen64(\"rw\")" , fp); |
141 | |
142 | return result; |
143 | } |
144 | |