From 082e680bd54e999f2bb4eb77141958938b1e9ee9 Mon Sep 17 00:00:00 2001 From: Manuel Novoa III 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/_trans2r.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 libc/stdio/_trans2r.c (limited to 'libc/stdio/_trans2r.c') diff --git a/libc/stdio/_trans2r.c b/libc/stdio/_trans2r.c new file mode 100644 index 000000000..d33d9eba8 --- /dev/null +++ b/libc/stdio/_trans2r.c @@ -0,0 +1,75 @@ +/* Copyright (C) 2004 Manuel Novoa III + * + * GNU Library General Public License (LGPL) version 2 or later. + * + * Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details. + */ + +#include "_stdio.h" + +/* Function to handle transition to reading. + * Initialize or verify the stream's orientation (even if writeonly). + * Check that the stream is readable. + * If currently reading, check that we can transition to writing. + * C99 requires that we not be reading, but attempting to + * auto-transition by commiting the write buffer is a configurable + * option. + * Returns 0 on success and EOF otherwise. + * + * Notes: + * There are two function signatures, depending on wchar support, + * since with no wchar support the orientation is narrow by default. + */ + +#ifdef __UCLIBC_HAS_WCHAR__ +int __stdio_trans2r_o(FILE * __restrict stream, int oflag) +#else +int __stdio_trans2r(FILE * __restrict stream) +#endif +{ + __STDIO_STREAM_VALIDATE(stream); + assert(!__STDIO_STREAM_IS_READING(stream)); + +#ifdef __UCLIBC_HAS_WCHAR__ + if (!(stream->__modeflags & oflag)) { + if (stream->__modeflags & (__FLAG_NARROW|__FLAG_WIDE)) { + __UNDEFINED_OR_NONPORTABLE; + goto DO_EBADF; + } + stream->__modeflags |= oflag; + } +#endif + + if (stream->__modeflags & __FLAG_WRITEONLY) { + DO_EBADF: + __set_errno(EBADF); + ERROR: + __STDIO_STREAM_SET_ERROR(stream); + __STDIO_STREAM_VALIDATE(stream); + return EOF; + } + + if (__STDIO_STREAM_IS_WRITING(stream)) { +#ifdef __UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION__ + if (__STDIO_COMMIT_WRITE_BUFFER(stream)) { /* commit failed! */ + goto ERROR; + } + assert(!__STDIO_STREAM_BUFFER_WUSED(stream)); + + __STDIO_STREAM_DISABLE_PUTC(stream); + __STDIO_STREAM_CLEAR_WRITING(stream); +#else + /* C99: Output shall not be directly followed by input without an + intervening call to the fflush function or to a file positioning + function (fseek, fsetpos, or rewind). */ + __UNDEFINED_OR_NONPORTABLE; + goto DO_EBADF; +#endif + } + + __STDIO_STREAM_SET_READING(stream); + /* getc macro is enabled when data is read into buffer. */ + + __STDIO_STREAM_VALIDATE(stream); + return 0; +} -- cgit v1.2.3