Changeset bd5414e in mainline for uspace/lib/posix/source/stdio.c

Timestamp:

2015-09-21T21:05:26Z (10 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

c70703a

Parents:

bea710f

Message:

Proper ungetc() in libc.

File:

• uspace/lib/posix/source/stdio.c (modified) (1 diff)

uspace/lib/posix/source/stdio.c

@@ -118 +118 @@
 int posix_ungetc(int c, FILE *stream)
 {
-        uint8_t b = (uint8_t) c;
-
-        bool can_unget =
-            /* Provided character is legal. */
-            c != EOF &&
-            /* Stream is consistent. */
-            !stream->error &&
-            /* Stream is buffered. */
-            stream->btype != _IONBF &&
-            /* Last operation on the stream was a read operation. */
-            stream->buf_state == _bs_read &&
-            /* Stream buffer is already allocated (i.e. there was already carried
-             * out either write or read operation on the stream). This is probably
-             * redundant check but let's be safe. */
-            stream->buf != NULL &&
-            /* There is still space in the stream to retreat. POSIX demands the
-             * possibility to unget at least 1 character. It should be always
-             * possible, assuming the last operation on the stream read at least 1
-             * character, because the buffer is refilled in the lazily manner. */
-            stream->buf_tail > stream->buf;
-
-        if (can_unget) {
-                --stream->buf_tail;
-                stream->buf_tail[0] = b;
-                stream->eof = false;
-                return (int) b;
-        } else {
-                return EOF;
-        }
+        return ungetc(c, stream);
 }