From 082e680bd54e999f2bb4eb77141958938b1e9ee9 Mon Sep 17 00:00:00 2001
From: Manuel Novoa III <mjn3@codepoet.org>
Date: Wed, 11 Feb 2004 23:48:50 +0000
Subject: New stdio core.  Should be more maintainable.  Fixes a couple of
 bugs.   Codepaths streamlined.  Improved performance for nonthreaded apps  
 when linked with a thread-enabled libc. Minor iconv bug and some
 locale/thread related startup issues fixed.   These showed up in getting a
 gcj-compiled java helloworld app running. Removed some old extension
 functions... _stdio_fdout and _stdio_fsfopen.

---
 libc/stdio/fgetwc.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 libc/stdio/fgetwc.c

(limited to 'libc/stdio/fgetwc.c')

diff --git a/libc/stdio/fgetwc.c b/libc/stdio/fgetwc.c
new file mode 100644
index 000000000..9f1f9c481
--- /dev/null
+++ b/libc/stdio/fgetwc.c
@@ -0,0 +1,134 @@
+/* Copyright (C) 2004       Manuel Novoa III    <mjn3@codepoet.org>
+ *
+ * GNU Library General Public License (LGPL) version 2 or later.
+ *
+ * Dedicated to Toni.  See uClibc/DEDICATION.mjn3 for details.
+ */
+
+#include "_stdio.h"
+
+#ifdef __DO_UNLOCKED
+
+weak_alias(__fgetwc_unlocked,fgetwc_unlocked);
+weak_alias(__fgetwc_unlocked,getwc_unlocked);
+#ifndef __UCLIBC_HAS_THREADS__
+weak_alias(__fgetwc_unlocked,fgetwc);
+weak_alias(__fgetwc_unlocked,getwc);
+#endif
+
+static void munge_stream(register FILE *stream, unsigned char *buf)
+{
+	stream->__bufend = stream->__bufstart = buf;
+	__STDIO_STREAM_INIT_BUFREAD_BUFPOS(stream);
+	__STDIO_STREAM_DISABLE_GETC(stream);
+	__STDIO_STREAM_DISABLE_PUTC(stream);
+}
+
+wint_t __fgetwc_unlocked(register FILE *stream)
+{
+	wint_t wi;
+	wchar_t wc[1];
+	int n;
+	size_t r;
+	unsigned char sbuf[1];
+
+	__STDIO_STREAM_VALIDATE(stream);
+
+	wi = WEOF;					/* Prepare for failure. */
+
+	if (__STDIO_STREAM_IS_WIDE_READING(stream)
+		|| !__STDIO_STREAM_TRANS_TO_READ(stream, __FLAG_WIDE)
+		) {
+		if (stream->__modeflags & __FLAG_UNGOT) { /* Any ungetwc()s? */
+			if (((stream->__modeflags & 1) || stream->__ungot[1])) {
+				stream->__ungot_width[0] = 0;	/* Application ungot... */
+			} else {			/* scanf ungot */
+				stream->__ungot_width[0] = stream->__ungot_width[1];
+			}
+
+			wi = stream->__ungot[(stream->__modeflags--) & 1];
+			stream->__ungot[1] = 0;
+			goto DONE;
+		}
+
+		if (!stream->__bufstart) {	/* Ugh... stream isn't buffered! */
+			/* Munge the stream temporarily to use a 1-byte buffer. */
+			munge_stream(stream, sbuf);
+			++stream->__bufend;
+		}
+
+		if (stream->__state.__mask == 0) { /* If last was a complete char */
+			stream->__ungot_width[0] = 0; /* then reset the width. */
+		}
+
+	LOOP:
+		if ((n = __STDIO_STREAM_BUFFER_RAVAIL(stream)) == 0) {
+			goto FILL_BUFFER;
+		}
+
+		r = mbrtowc(wc, stream->__bufpos, n, &stream->__state);
+		if (((ssize_t) r) >= 0) { /* Success... */
+			if (r == 0) { /* Nul wide char... means 0 byte for us so */
+				++r;	 /* increment r and handle below as single. */
+			}
+			stream->__bufpos += r;
+			stream->__ungot_width[0] += r;
+			wi = *wc;
+			goto DONE;
+		}
+
+		if (r == ((size_t) -2)) {
+			/* Potentially valid but incomplete and no more buffered. */
+			stream->__bufpos += n; /* Update bufpos for stream. */
+			stream->__ungot_width[0] += n;
+		FILL_BUFFER:
+			if(__STDIO_FILL_READ_BUFFER(stream)) { /* Refill succeeded? */
+				goto LOOP;
+			}
+			if (!__FERROR_UNLOCKED(stream)) { /* EOF with no error. */
+				if (!stream->__state.__mask) { /* No partial wchar. */
+					goto DONE;
+				}
+				/* EOF but partially complete wchar. */
+				/* TODO: should EILSEQ be set? */
+				__set_errno(EILSEQ);
+			}
+		}
+
+		/* If we reach here, either r == ((size_t)-1) and mbrtowc set errno
+		 * to EILSEQ, or r == ((size_t)-2) and stream is in an error state
+		 * or at EOF with a partially complete wchar.  Make sure stream's
+		 * error indicator is set. */
+		stream->__modeflags |= __FLAG_ERROR;
+
+	DONE:
+		if (stream->__bufstart == sbuf) { /* Need to un-munge the stream. */
+			munge_stream(stream, NULL);
+		}
+
+	}
+
+	__STDIO_STREAM_VALIDATE(stream);
+
+	return wi;
+}
+
+#elif defined __UCLIBC_HAS_THREADS__
+
+weak_alias(fgetwc,getwc);
+
+wint_t fgetwc(register FILE *stream)
+{
+	wint_t retval;
+	__STDIO_AUTO_THREADLOCK_VAR;
+
+	__STDIO_AUTO_THREADLOCK(stream);
+
+	retval = __fgetwc_unlocked(stream);
+
+	__STDIO_AUTO_THREADUNLOCK(stream);
+
+	return retval;
+}
+
+#endif
-- 
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