129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int
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main (int argc, char **argv)
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{
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static const char hello[] = "Hello, world.\n";
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static const char replace[] = "Hewwo, world.\n";
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static const size_t replace_from = 2, replace_to = 4;
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char filename[FILENAME_MAX];
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char *name = strrchr (*argv, '/');
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char buf[BUFSIZ];
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FILE *f;
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int lose = 0;
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if (name != NULL)
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++name;
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else
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name = *argv;
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(void) sprintf (filename, OBJPFX "%s.test", name);
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f = fopen (filename, "w+");
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if (f == NULL)
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{
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perror (filename);
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exit (1);
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}
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(void) fputs (hello, f);
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rewind (f);
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(void) fgets (buf, sizeof (buf), f);
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rewind (f);
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(void) fputs (buf, f);
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rewind (f);
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{
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size_t i;
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for (i = 0; i < replace_from; ++i)
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{
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int c = getc (f);
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if (c == EOF)
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{
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printf ("EOF at %Zu.\n", i);
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lose = 1;
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break;
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}
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else if (c != hello[i])
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{
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printf ("Got '%c' instead of '%c' at %Zu.\n",
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(unsigned char) c, hello[i], i);
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lose = 1;
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break;
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}
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}
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}
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{
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long int where = ftell (f);
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if (where == (long int) replace_from)
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{
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size_t i;
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for (i = replace_from; i < replace_to; ++i)
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if (putc(replace[i], f) == EOF)
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{
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printf ("putc('%c') got %s at %Zu.\n",
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replace[i], strerror (errno), i);
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lose = 1;
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break;
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}
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}
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else if (where == -1L)
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{
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printf ("ftell got %s (should be at %Zu).\n",
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strerror (errno), replace_from);
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lose = 1;
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}
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else
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{
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printf ("ftell returns %lu; should be %Zu.\n", where, replace_from);
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lose = 1;
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}
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}
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if (!lose)
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{
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rewind (f);
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if (fgets (buf, sizeof (buf), f) == NULL)
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{
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printf ("fgets got %s.\n", strerror(errno));
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lose = 1;
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}
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else if (strcmp (buf, replace))
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{
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printf ("Read \"%s\" instead of \"%s\".\n", buf, replace);
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lose = 1;
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}
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}
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if (lose)
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printf ("Test FAILED! Losing file is \"%s\".\n", filename);
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else
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{
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(void) remove (filename);
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puts ("Test succeeded.");
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}
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return lose ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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