Use Linux 6.6 in build-many-glibcs.py
[glibc.git] / libio / bug-ungetc4.c
blob8a05def686b1f491e9f91872299382ff69468644
1 /* Test program for ungetc/fseekpos interaction.
2 Copyright (C) 2004-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
19 #include <stdio.h>
21 #include <support/xunistd.h>
23 static void do_prepare (void);
24 #define PREPARE(argc, argv) do_prepare ()
25 static int do_test (void);
26 #define TEST_FUNCTION do_test ()
27 #include "../test-skeleton.c"
29 static const char pattern[] = "abcdefghijklmnopqrstuvwxyz";
30 static char *temp_file;
32 static void
33 do_prepare (void)
35 int fd = create_temp_file ("bug-ungetc.", &temp_file);
36 if (fd == -1)
38 printf ("cannot create temporary file: %m\n");
39 exit (1);
41 xwrite (fd, pattern, sizeof (pattern) - 1);
42 close (fd);
45 #define TEST_POS 5
47 static int
48 do_one_test (int mode)
50 FILE *f = fopen (temp_file, "r");
51 if (f == NULL)
53 printf ("%d: could not open temporary file: %m\n", mode);
54 return 1;
57 int i;
58 for (i = 0; i < TEST_POS; ++i)
59 getc (f);
61 fpos_t p;
62 if (fgetpos (f, &p) != 0)
64 printf ("%d: fgetpos failed: %m\n", mode);
65 return 1;
68 if (mode)
70 if (fseek (f, 0, SEEK_SET) != 0)
72 printf ("%d: fseek failed: %m\n", mode);
73 return 1;
76 for (i = 0; i < TEST_POS - (mode >= 2); ++i)
77 getc (f);
80 if (mode != 2 && ungetc ('X', f) != 'X')
82 printf ("%d: ungetc failed\n", mode);
83 return 1;
86 if (mode == 3 && getc (f) != 'X')
88 printf ("%d: getc after ungetc did not return X\n", mode);
89 return 1;
92 if (fsetpos (f, &p) != 0)
94 printf ("%d: fsetpos failed: %m\n", mode);
95 return 1;
98 if (getc (f) != pattern[TEST_POS])
100 printf ("%d: getc did not return %c\n", mode, pattern[TEST_POS]);
101 return 1;
104 fclose (f);
106 return 0;
109 static int
110 do_test (void)
112 int mode, ret = 0;
113 for (mode = 0; mode <= 4; mode++)
114 ret |= do_one_test (mode);
115 return ret;