1 | /* Test program for ungetc/ftell interaction bug. */ |
2 | |
3 | #include <stdio.h> |
4 | |
5 | static void do_prepare (void); |
6 | #define PREPARE(argc, argv) do_prepare () |
7 | static int do_test (void); |
8 | #define TEST_FUNCTION do_test () |
9 | #include "../test-skeleton.c" |
10 | |
11 | static const char pattern[] = "12345" ; |
12 | static char *temp_file; |
13 | |
14 | static void |
15 | do_prepare (void) |
16 | { |
17 | int fd = create_temp_file (base: "bug-ungetc." , filename: &temp_file); |
18 | if (fd == -1) |
19 | { |
20 | printf (format: "cannot create temporary file: %m\n" ); |
21 | exit (1); |
22 | } |
23 | write (fd, pattern, sizeof (pattern)); |
24 | close (fd: fd); |
25 | } |
26 | |
27 | static int |
28 | do_one_test (int mode) |
29 | { |
30 | FILE *f; |
31 | |
32 | f = fopen (temp_file, "r" ); |
33 | if (f == NULL) |
34 | { |
35 | printf (format: "could not open temporary file: %m\n" ); |
36 | return 1; |
37 | } |
38 | |
39 | if (mode == 1 && ftell (stream: f) != 0) |
40 | { |
41 | printf (format: "first ftell returned wrong position %ld\n" , ftell (stream: f)); |
42 | return 1; |
43 | } |
44 | |
45 | if (fgetc (stream: f) != '1' || fgetc (stream: f) != '2') |
46 | { |
47 | puts (s: "fgetc failed" ); |
48 | return 1; |
49 | } |
50 | |
51 | if (mode == 2 && ftell (stream: f) != 2) |
52 | { |
53 | printf (format: "second ftell returned wrong position %ld\n" , ftell (stream: f)); |
54 | return 1; |
55 | } |
56 | |
57 | if (ungetc ('6', f) != '6') |
58 | { |
59 | puts (s: "ungetc failed" ); |
60 | return 1; |
61 | } |
62 | |
63 | if (ftell (stream: f) != 1) |
64 | { |
65 | printf (format: "third ftell returned wrong position %ld\n" , ftell (stream: f)); |
66 | return 1; |
67 | } |
68 | |
69 | if (fgetc (stream: f) != '6') |
70 | { |
71 | puts (s: "fgetc failed" ); |
72 | return 1; |
73 | } |
74 | |
75 | if (ftell (stream: f) != 2) |
76 | { |
77 | printf (format: "fourth ftell returned wrong position %ld\n" , ftell (stream: f)); |
78 | return 1; |
79 | } |
80 | |
81 | fclose (f); |
82 | |
83 | return 0; |
84 | } |
85 | |
86 | static int |
87 | do_test (void) |
88 | { |
89 | int mode; |
90 | for (mode = 0; mode <= 2; mode++) |
91 | if (do_one_test (mode)) |
92 | return 1; |
93 | return 0; |
94 | } |
95 | |