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authorManuel Novoa III <mjn3@codepoet.org>2003-06-24 04:07:40 +0000
committerManuel Novoa III <mjn3@codepoet.org>2003-06-24 04:07:40 +0000
commitdba553769ed6437444b635ba8818e5a3cb252e00 (patch)
tree93136566ff450008e56169a195babcefdc90bd1d /libc/stdio/stdio.c
parentefe2271a53aee5145308349d31e6d45a8571758a (diff)
Change 'undefined behavior' of fflush() on readonly or reading streams
to match that of current glibc; i.e. don't do anything and return success. Apparently, php calls fflush() on a file opened as readonly before trying to read. Eventually I'll add some config options to flag this and several other instances of nonportable code.
Diffstat (limited to 'libc/stdio/stdio.c')
-rw-r--r--libc/stdio/stdio.c26
1 files changed, 18 insertions, 8 deletions
diff --git a/libc/stdio/stdio.c b/libc/stdio/stdio.c
index eec8bdda3..9a7afbc85 100644
--- a/libc/stdio/stdio.c
+++ b/libc/stdio/stdio.c
@@ -2210,14 +2210,18 @@ int fflush_unlocked(register FILE *stream)
if (_stdio_fwrite(NULL, 0, stream) > 0) { /* flush buffer contents. */
rv = -1; /* Not all chars written. */
}
- } else if (stream->modeflags & __FLAG_READONLY) {
- /* According to info, glibc returns an error when the file is opened
- * in read-only mode.
- * ANSI/ISO says behavior in this case is undefined but also says you
- * shouldn't flush a stream you were reading from. */
- stream->modeflags |= __FLAG_ERROR; /* TODO - check glibc behavior */
+#ifdef __UCLIBC_MJN3_ONLY__
+#warning add option to test for undefined behavior of fflush
+#endif /* __UCLIBC_MJN3_ONLY__ */
+#if 0
+ } else if (stream->modeflags & (__FLAG_READING|__FLAG_READONLY)) {
+ /* ANSI/ISO says behavior in this case is undefined but also says you
+ * shouldn't flush a stream you were reading from. As usual, glibc
+ * caters to broken programs and simply ignores this. */
+ stream->modeflags |= __FLAG_ERROR;
__set_errno(EBADF);
rv = -1;
+#endif
}
#ifndef NDEBUG
@@ -2235,11 +2239,17 @@ int fflush_unlocked(register FILE *stream)
}
#endif
- /* TODO -- check glibc behavior regarding error indicator */
+#ifdef __UCLIBC_MJN3_ONLY__
+#warning add option to test for undefined behavior of fflush
+#endif /* __UCLIBC_MJN3_ONLY__ */
+#if 0
return ((stream != NULL)
- && (stream->modeflags & __FLAG_READONLY)
+ && (stream->modeflags & (__FLAG_READING|__FLAG_READONLY))
? ((stream->modeflags |= __FLAG_ERROR), __set_errno(EBADF), EOF)
: 0 );
+#else
+ return 0;
+#endif
#endif /* __STDIO_BUFFERS */
}