.
[glibc/history.git] / libio / bug-ungetc4.c
blob0f530efecf93567d66de37d5ae28fd9a1daeea0f
1 /* Test program for ungetc/fseekpos interaction.
2 Copyright (C) 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
21 #include <stdio.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 write (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;