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-rw-r--r--stdio-common/test_rdwr.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/stdio-common/test_rdwr.c b/stdio-common/test_rdwr.c
new file mode 100644
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+++ b/stdio-common/test_rdwr.c
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+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+int
+DEFUN(main, (argc, argv), int argc AND char **argv)
+{
+ static CONST char hello[] = "Hello, world.\n";
+ static CONST char replace[] = "Hewwo, world.\n";
+ static CONST size_t replace_from = 2, replace_to = 4;
+ char filename[FILENAME_MAX];
+ char *name = strrchr(*argv, '/');
+ char buf[BUFSIZ];
+ FILE *f;
+ int lose = 0;
+
+ if (name != NULL)
+ ++name;
+ else
+ name = *argv;
+
+ (void) sprintf(filename, "/tmp/%s.test", name);
+
+ f = fopen(filename, "w+");
+ if (f == NULL)
+ {
+ perror(filename);
+ exit(1);
+ }
+
+ (void) fputs(hello, f);
+ rewind(f);
+ (void) fgets(buf, sizeof(buf), f);
+ rewind(f);
+ (void) fputs(buf, f);
+ rewind(f);
+ {
+ register size_t i;
+ for (i = 0; i < replace_from; ++i)
+ {
+ int c = getc(f);
+ if (c == EOF)
+ {
+ printf("EOF at %u.\n", i);
+ lose = 1;
+ break;
+ }
+ else if (c != hello[i])
+ {
+ printf("Got '%c' instead of '%c' at %u.\n",
+ (unsigned char) c, hello[i], i);
+ lose = 1;
+ break;
+ }
+ }
+ }
+
+ {
+ long int where = ftell(f);
+ if (where == replace_from)
+ {
+ register size_t i;
+ for (i = replace_from; i < replace_to; ++i)
+ if (putc(replace[i], f) == EOF)
+ {
+ printf("putc('%c') got %s at %u.\n",
+ replace[i], strerror(errno), i);
+ lose = 1;
+ break;
+ }
+ }
+ else if (where == -1L)
+ {
+ printf("ftell got %s (should be at %u).\n",
+ strerror(errno), replace_from);
+ lose = 1;
+ }
+ else
+ {
+ printf("ftell returns %u; should be %u.\n", where, replace_from);
+ lose = 1;
+ }
+ }
+
+ if (!lose)
+ {
+ rewind(f);
+ if (fgets(buf, sizeof(buf), f) == NULL)
+ {
+ printf("fgets got %s.\n", strerror(errno));
+ lose = 1;
+ }
+ else if (strcmp(buf, replace))
+ {
+ printf("Read \"%s\" instead of \"%s\".\n", buf, replace);
+ lose = 1;
+ }
+ }
+
+ if (lose)
+ printf("Test FAILED! Losing file is \"%s\".\n", filename);
+ else
+ {
+ (void) remove(filename);
+ puts("Test succeeded.");
+ }
+
+ exit(lose ? EXIT_FAILURE : EXIT_SUCCESS);
+}