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authorSiddhesh Poyarekar <siddhesh@redhat.com>2012-11-28 00:59:27 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2012-11-28 01:00:50 +0530
commitde2fd463b1c0310d75084b6d774fb974075a4ad9 (patch)
treed51bae43dd28baf8aa9dd591e5195bd938f89482 /libio
parentc515fb5148f1d81d5f7736825e14c7502c15432a (diff)
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Make fwrite return 0 on EOF
Diffstat (limited to 'libio')
-rw-r--r--libio/Makefile3
-rw-r--r--libio/iofwrite.c10
-rw-r--r--libio/iofwrite_u.c10
-rw-r--r--libio/tst-fwrite-error.c66
4 files changed, 78 insertions, 11 deletions
diff --git a/libio/Makefile b/libio/Makefile
index 9ccd6a0c38..83d90d0a97 100644
--- a/libio/Makefile
+++ b/libio/Makefile
@@ -59,7 +59,8 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc \
tst-memstream1 tst-memstream2 \
tst-wmemstream1 tst-wmemstream2 \
bug-memstream1 bug-wmemstream1 \
- tst-setvbuf1 tst-popen1 tst-fgetwc bug-wsetpos bug-fclose1 tst-fseek
+ tst-setvbuf1 tst-popen1 tst-fgetwc bug-wsetpos bug-fclose1 tst-fseek \
+ tst-fwrite-error
ifeq (yes,$(build-shared))
# Add test-fopenloc only if shared library is enabled since it depends on
# shared localedata objects.
diff --git a/libio/iofwrite.c b/libio/iofwrite.c
index d4610f78ca..2fff72b408 100644
--- a/libio/iofwrite.c
+++ b/libio/iofwrite.c
@@ -42,12 +42,12 @@ _IO_fwrite (buf, size, count, fp)
if (_IO_vtable_offset (fp) != 0 || _IO_fwide (fp, -1) == -1)
written = _IO_sputn (fp, (const char *) buf, request);
_IO_release_lock (fp);
- /* We have written all of the input in case the return value indicates
- this or EOF is returned. The latter is a special case where we
- simply did not manage to flush the buffer. But the data is in the
- buffer and therefore written as far as fwrite is concerned. */
- if (written == request || written == EOF)
+ /* We are guaranteed to have written all of the input, none of it, or
+ some of it. */
+ if (written == request)
return count;
+ else if (written == EOF)
+ return 0;
else
return written / size;
}
diff --git a/libio/iofwrite_u.c b/libio/iofwrite_u.c
index a1077eeb92..245a93ee02 100644
--- a/libio/iofwrite_u.c
+++ b/libio/iofwrite_u.c
@@ -44,12 +44,12 @@ fwrite_unlocked (buf, size, count, fp)
if (_IO_fwide (fp, -1) == -1)
{
written = _IO_sputn (fp, (const char *) buf, request);
- /* We have written all of the input in case the return value indicates
- this or EOF is returned. The latter is a special case where we
- simply did not manage to flush the buffer. But the data is in the
- buffer and therefore written as far as fwrite is concerned. */
- if (written == request || written == EOF)
+ /* We are guaranteed to have written all of the input, none of it, or
+ some of it. */
+ if (written == request)
return count;
+ else if (written == EOF)
+ return 0;
}
return written / size;
diff --git a/libio/tst-fwrite-error.c b/libio/tst-fwrite-error.c
new file mode 100644
index 0000000000..3c0cf49c3a
--- /dev/null
+++ b/libio/tst-fwrite-error.c
@@ -0,0 +1,66 @@
+/* Test of fwrite() function, adapted from gnulib-tests in grep.
+ Copyright (C) 2011-2012 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3, or (at your option)
+ any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, see <http://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+
+static int
+do_test (void)
+{
+ char tmpl[] = "/tmp/tst-fwrite-error.XXXXXX";
+ int fd = mkstemp (tmpl);
+ if (fd == -1)
+ {
+ printf ("mkstemp failed with errno %d\n", errno);
+ return 1;
+ }
+ FILE *fp = fdopen (fd, "w");
+ if (fp == NULL)
+ {
+ printf ("fdopen failed with errno %d\n", errno);
+ return 1;
+ }
+
+ char buf[5] = "world";
+ setvbuf (fp, NULL, _IONBF, 0);
+ close (fd);
+ unlink (tmpl);
+ errno = 0;
+
+ int ret = fwrite (buf, 1, sizeof (buf), fp);
+ if (ret != 0)
+ {
+ printf ("fwrite returned %d\n", ret);
+ return 1;
+ }
+ if (errno != EBADF)
+ {
+ printf ("Errno is not EBADF: %d\n", errno);
+ return 1;
+ }
+ if (ferror (fp) == 0)
+ {
+ printf ("ferror not set\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"