/*  Copyright (C) 2002     Manuel Novoa III
 *  My stdio library for linux and (soon) elks.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*  ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION!
 *
 *  This code is currently under development.  Also, I plan to port
 *  it to elks which is a 16-bit environment with a fairly limited
 *  compiler.  Therefore, please refrain from modifying this code
 *  and, instead, pass any bug-fixes, etc. to me.  Thanks.  Manuel
 *
 *  ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION! */

/* Before we include anything, convert L_ctermid to L_ctermid_function
 * and undef L_ctermid if defined.  This is necessary as L_ctermid is
 * a SUSv3 standard macro defined in stdio.h. */
#ifdef L_ctermid
#define L_ctermid_function
#undef L_ctermid
#endif

#define _ISOC99_SOURCE			/* for ULLONG primarily... */
#define _GNU_SOURCE
#define _STDIO_UTILITY			/* for _stdio_fdout and _uintmaxtostr. */
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <stdint.h>
#include <stdarg.h>
#include <errno.h>
#include <assert.h>
#include <stdio_ext.h>
#include <unistd.h>
#include <fcntl.h>

#ifndef O_LARGEFILE		/* uClibc undefines this if no large file support. */
#ifdef __STDIO_LARGE_FILES
#error missing define for O_LARGEFILE!
#endif
#define O_LARGEFILE		0
#endif

/**********************************************************************/
/* First deal with some build issues... */

#ifndef __STDIO_THREADSAFE
/* Just build empty object files if any of these were defined. */
/* Note though that we do keep the various *_unlocked names as aliases. */
#undef L___fsetlocking
#undef L___flockfile
#undef L___ftrylockfile
#undef L___funlockfile
#endif

#ifndef __STDIO_LARGE_FILES
/* Just build empty object files if any of these were defined. */
#undef L_fopen64
#undef L_freopen64
#undef L_ftello64
#undef L_fseeko64
#undef L_fsetpos64
#undef L_fgetpos64
#endif

/**********************************************************************/

#ifndef __STDIO_THREADSAFE

#ifdef __BCC__
#define UNLOCKED_STREAM(RETURNTYPE,NAME,PARAMS,ARGS,STREAM) \
asm(".text\nexport _" "NAME" "_unlocked\n_" "NAME" "_unlocked = _" "NAME"); \
RETURNTYPE NAME PARAMS
#else
#define UNLOCKED_STREAM(RETURNTYPE,NAME,PARAMS,ARGS,STREAM) \
strong_alias(NAME,NAME##_unlocked) \
RETURNTYPE NAME PARAMS
#endif

#define UNLOCKED(RETURNTYPE,NAME,PARAMS,ARGS) \
	UNLOCKED_STREAM(RETURNTYPE,NAME,PARAMS,ARGS,stream)

#ifdef __BCC__
#define UNLOCKED_VOID_RETURN(NAME,PARAMS,ARGS) \
asm(".text\nexport _" "NAME" "_unlocked\n_" "NAME" "_unlocked = _" "NAME"); \
void NAME PARAMS
#else
#define UNLOCKED_VOID_RETURN(NAME,PARAMS,ARGS) \
strong_alias(NAME,NAME##_unlocked) \
void NAME PARAMS
#endif

#define __STDIO_THREADLOCK_OPENLIST
#define __STDIO_THREADUNLOCK_OPENLIST

#else  /* __STDIO_THREADSAFE */

#include <pthread.h>

#define UNLOCKED_STREAM(RETURNTYPE,NAME,PARAMS,ARGS,STREAM) \
RETURNTYPE NAME PARAMS \
{ \
	RETURNTYPE retval; \
	__STDIO_THREADLOCK(STREAM); \
	retval = NAME##_unlocked ARGS ; \
	__STDIO_THREADUNLOCK(STREAM); \
	return retval; \
} \
RETURNTYPE NAME##_unlocked PARAMS

#define UNLOCKED(RETURNTYPE,NAME,PARAMS,ARGS) \
	UNLOCKED_STREAM(RETURNTYPE,NAME,PARAMS,ARGS,stream)

#define UNLOCKED_VOID_RETURN(NAME,PARAMS,ARGS) \
void NAME PARAMS \
{ \
	__STDIO_THREADLOCK(stream); \
	NAME##_unlocked ARGS ; \
	__STDIO_THREADUNLOCK(stream); \
} \
void NAME##_unlocked PARAMS

#define __STDIO_THREADLOCK_OPENLIST \
	pthread_mutex_lock(&_stdio_openlist_lock)

#define __STDIO_THREADUNLOCK_OPENLIST \
	pthread_mutex_unlock(&_stdio_openlist_lock)

#define __STDIO_THREADTRYLOCK_OPENLIST \
	pthread_mutex_trylock(&_stdio_openlist_lock)

#endif /* __STDIO_THREADSAFE */

/**********************************************************************/

#ifdef __STDIO_WIDE
#define __STDIO_FILE_INIT_UNGOT		{ 0, 0 }, { 0, 0 },
#else
#define __STDIO_FILE_INIT_UNGOT		{ 0, 0 },
#endif

#ifdef __STDIO_GETC_MACRO
#define __STDIO_FILE_INIT_BUFGETC(x) x,
#else
#define __STDIO_FILE_INIT_BUFGETC(x)
#endif

#ifdef __STDIO_PUTC_MACRO
#define __STDIO_FILE_INIT_BUFPUTC(x) x,
#else
#define __STDIO_FILE_INIT_BUFPUTC(x)
#endif

#if defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS)
#define __STDIO_FILE_INIT_NEXT(next)	(next),
#else  /* defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS) */
#define __STDIO_FILE_INIT_NEXT(next)
#endif /* defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS) */

#ifdef __STDIO_BUFFERS
#define __STDIO_FILE_INIT_BUFFERS(buf,bufsize) \
	(buf), (buf)+(bufsize), (buf), (buf),
#else
#define __STDIO_FILE_INIT_BUFFERS(buf,bufsize)
#endif

#ifdef __STDIO_GLIBC_CUSTOM_STREAMS
#define __STDIO_FILE_INIT_CUSTOM_STREAM(stream) \
	&((stream).filedes), { _cs_read, _cs_write, NULL, _cs_close },
#else
#define __STDIO_FILE_INIT_CUSTOM_STREAM(stream)
#endif

#ifdef __STDIO_MBSTATE
#define __STDIO_FILE_INIT_MBSTATE \
	{ 0, 0 },
#else
#define __STDIO_FILE_INIT_MBSTATE
#endif


#ifdef __STDIO_THREADSAFE
#define __STDIO_FILE_INIT_THREADSAFE \
	0, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP,
#else
#define __STDIO_FILE_INIT_THREADSAFE
#endif

#define __STDIO_INIT_FILE_STRUCT(stream, flags, filedes, next, buf, bufsize) \
	{ (flags), \
	__STDIO_FILE_INIT_UNGOT \
	(filedes), \
	__STDIO_FILE_INIT_NEXT(next) \
	__STDIO_FILE_INIT_BUFFERS(buf,bufsize) \
	__STDIO_FILE_INIT_BUFGETC((buf)) \
	__STDIO_FILE_INIT_BUFPUTC((buf)) \
	__STDIO_FILE_INIT_CUSTOM_STREAM(stream) \
	__STDIO_FILE_INIT_MBSTATE \
	__STDIO_FILE_INIT_THREADSAFE \
} /* TODO: mbstate and builtin buf */

#ifdef __STDIO_GLIBC_CUSTOM_STREAMS

/* TODO -- what does glibc do for undefined funcs?  errno set? */
#define __READ(STREAMPTR,BUF,SIZE) \
	((((STREAMPTR)->gcs.read) == NULL) ? -1 : \
	(((STREAMPTR)->gcs.read)((STREAMPTR)->cookie,(BUF),(SIZE))))
#define __WRITE(STREAMPTR,BUF,SIZE) \
	((((STREAMPTR)->gcs.write) == NULL) ? -1 : \
	(((STREAMPTR)->gcs.write)((STREAMPTR)->cookie,(BUF),(SIZE))))
#define __CLOSE(STREAMPTR) \
	((((STREAMPTR)->gcs.close) == NULL) ? 0 : \
	(((STREAMPTR)->gcs.close)((STREAMPTR)->cookie)))

#else  /* __STDIO_GLIBC_CUSTOM_STREAMS */

#define __READ(STREAMPTR,BUF,SIZE) \
	(read((STREAMPTR)->filedes,(BUF),(SIZE)))
#define __WRITE(STREAMPTR,BUF,SIZE) \
	(write((STREAMPTR)->filedes,(BUF),(SIZE)))
#define __CLOSE(STREAMPTR) \
	(close((STREAMPTR)->filedes))

#endif /* __STDIO_GLIBC_CUSTOM_STREAMS */

/**********************************************************************/
/* POSIX functions */
/**********************************************************************/
#ifdef L_getw

/* SUSv2 Legacy function -- need not be reentrant. */

int getw(FILE *stream)
{
	int aw[1];

#ifdef __STDIO_WIDE

	return (fread((void *)aw, sizeof(int), 1, stream) > 0) ? (*aw) : EOF;

#else  /* __STDIO_WIDE */

	return (_stdio_fread((unsigned char *)(aw), sizeof(int), stream)
			== sizeof(int)) ? (*aw) : EOF;

#endif /* __STDIO_WIDE */
}

#endif
/**********************************************************************/
#ifdef L_putw

/* SUSv2 Legacy function -- need not be reentrant. */

int putw(int w, FILE *stream)
{
	int aw[1];

	*aw = w;					/* In case 'w' is in a register... */

#ifdef __STDIO_WIDE

	return (fwrite((void *)aw, sizeof(int), 1, stream) == 1) ? 0 : EOF;

#else  /* __STDIO_WIDE */

	return (_stdio_fwrite((unsigned char *)aw, sizeof(int), stream)
			== sizeof(int)) ? 0 : EOF;

#endif /* __STDIO_WIDE */
}

#endif
/**********************************************************************/
#ifdef L_fileno

/* Reentrancy handled by UNLOCKED() macro. */

UNLOCKED(int,fileno,(register FILE *stream),(stream))
{
#ifdef __STDIO_GLIBC_CUSTOM_STREAMS
	return ( ((stream->cookie == &(stream->filedes)) && (stream->filedes >= 0))
			 ? stream->filedes
			 : (__set_errno(EBADF), -1) );
#else  /* __STDIO_GLIBC_CUSTOM_STREAMS */
	return (stream->filedes >= 0) ? stream->filedes : (__set_errno(EBADF), -1);
#endif /* __STDIO_GLIBC_CUSTOM_STREAMS */
}

#endif
/**********************************************************************/
#ifdef L_fdopen

/* No reentrancy issues. */

FILE *fdopen(int filedes, const char *mode)
{
	register char *cur_mode;	/* TODO -- replace by intptr_t?? */

	return (((int)(cur_mode = (char *) fcntl(filedes, F_GETFL))) != -1)
		? _stdio_fopen(cur_mode, mode, NULL, filedes) 
		: NULL;
}

#endif
/**********************************************************************/
#ifdef L_fopen64

/* No reentrancy issues. */

FILE *fopen64(const char * __restrict filename, const char * __restrict mode)
{
	return _stdio_fopen(filename, mode, NULL, -2);
}

#endif
/**********************************************************************/
#ifdef L_ctermid_function

/* Not required to be reentrant. */

char *ctermid(register char *s)
{
	static char sbuf[L_ctermid];

#ifdef __BCC__
	/* Currently elks doesn't support /dev/tty. */
	if (!s) {
		s = sbuf;
	}
	*s = 0;

	return s;
#else
	/* glibc always returns /dev/tty for linux. */
	return strcpy((s ? s : sbuf), "/dev/tty");
#endif
}

#endif
/**********************************************************************/
/* BSD functions */
/**********************************************************************/
#ifdef L_setbuffer

/* No reentrancy issues. */

void setbuffer(FILE * __restrict stream, register char * __restrict buf,
			   size_t size)
{
#ifdef __STDIO_BUFFERS
	setvbuf(stream, buf, (buf ? _IOFBF : _IONBF), size);
#else  /* __STDIO_BUFFERS */
	/* Nothing to do. */
#endif /* __STDIO_BUFFERS */
}

#endif
/**********************************************************************/
#ifdef L_setlinebuf

/* No reentrancy issues. */

void setlinebuf(FILE * __restrict stream)
{
#ifdef __STDIO_BUFFERS
	setvbuf(stream, NULL, _IOLBF, (size_t) 0);
#else  /* __STDIO_BUFFERS */
	/* Nothing to do. */
#endif /* __STDIO_BUFFERS */
}

#endif
/**********************************************************************/
/* GLIBC functions */
/**********************************************************************/
#ifdef L_fcloseall

/* NOTE: GLIBC difference!!! -- fcloseall
 * According to the info pages, glibc actually fclose()s all open files.
 * Apparently, glibc's new version only fflush()s and unbuffers all
 * writing streams to cope with unordered destruction of c++ static
 * objects.  Here we implement the old behavior as default.
 */

/* Not reentrant. */

int fcloseall (void)
{
#if defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS)
	register FILE *stream;
	int rv;

	_stdio_term();				/* Let _stdio_term() do all the work. */

	rv = 0;
	for (stream = _stdio_openlist ; stream ; stream = stream->nextopen) {
		if (stream->modeflags & (__FLAG_WRITING|__FLAG_ERROR)) {
			/* TODO -- is this correct?  Maybe ferror set before flush...
			* could check if pending writable but what if term unbuffers?
			* in that case, could clear error flag... */
			rv = EOF;			/* Only care about failed writes. */
		}
	}

	/* Make sure _stdio_term() does nothing on exit. */
	_stdio_openlist = NULL;

	return rv;
#else  /* defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS) */

	return 0;

#endif /* defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS) */
}

#endif
/**********************************************************************/
#ifdef L_fmemopen
#ifdef __STDIO_GLIBC_CUSTOM_STREAMS

typedef struct {
	size_t pos;
	size_t len;
	size_t eof;
	int dynbuf;
	unsigned char *buf;
	FILE *fp;
} __fmo_cookie;

#define COOKIE ((__fmo_cookie *) cookie)

static ssize_t fmo_read(register void *cookie, char *buf, size_t bufsize)
{
	size_t count = COOKIE->len - COOKIE->pos;

	/* Note: bufsize < SSIZE_MAX because of _stdio_READ. */

	if (bufsize > count) {
		bufsize = count;
	}

#if 1							/* TODO - choose code option */
	memcpy(buf, COOKIE->buf + COOKIE->pos, bufsize);
	COOKIE->pos += bufsize;
#else
	{
		register char *p = COOKIE->buf + COOKIE->pos;

		count = bufsize;
		while (count) {
			*buf++ = *p++;
			--count;
		}
		COOKIE->pos += bufsize;
	}
#endif

	return bufsize;
}

static ssize_t fmo_write(register void *cookie, const char *buf, size_t bufsize)
{
	size_t count;

	/* Note: bufsize < SSIZE_MAX because of _stdio_WRITE. */

	/* If appending, need to seek to end of file!!!! */
	if (COOKIE->fp->modeflags & __FLAG_APPEND) {
		COOKIE->pos = COOKIE->eof;
	}

	count = COOKIE->len - COOKIE->pos;

	if (bufsize > count) {
		bufsize = count;
		if (count == 0) {		/* We're at the end of the buffer... */
			__set_errno(EFBIG);
			return -1;
		}
	}

#if 1							/* TODO - choose code option */
	memcpy(COOKIE->buf + COOKIE->pos, buf, bufsize);
	COOKIE->pos += bufsize;

	if (COOKIE->pos > COOKIE->eof) {
		COOKIE->eof = COOKIE->pos;
		if (bufsize < count) {	/* New eof and still room in buffer? */
			*(COOKIE->buf + COOKIE->pos) = 0;
		}
	}

#else
	{
		register char *p = COOKIE->buf + COOKIE->pos;
		size_t i = bufsize;

		while (i > 0) {
			*p++ = *buf++;
			--i;
		}
		COOKIE->pos += bufsize;

		if (COOKIE->pos > COOKIE->eof) {
			COOKIE->eof = COOKIE->pos;
			if (bufsize < count) {	/* New eof and still room in buffer? */
				*p = 0;
			}
		}
	}

#endif

	return bufsize;
}

/* glibc doesn't allow seeking, but it has in-buffer seeks... we don't. */
static int fmo_seek(register void *cookie, __offmax_t *pos, int whence)
{
	__offmax_t p = *pos;

	/* Note: fseek already checks that whence is legal, so don't check here
	 * unless debugging. */
	assert(((unsigned int) whence) <= 2);

	if (whence != SEEK_SET) {
		p += (whence == SEEK_CUR) ? COOKIE->pos : /* SEEK_END */ COOKIE->eof;
	}

	/* Note: glibc only allows seeking in the buffer.  We'll actually restrict
	 * to the data. */
	/* Check for offset < 0, offset > eof, or offset overflow... */
	if (((uintmax_t) p) > COOKIE->eof) {
		return -1;
	}

	COOKIE->pos = *pos = p;
	return 0;
}

static int fmo_close(register void *cookie)
{
	if (COOKIE->dynbuf) {
		free(COOKIE->buf);
	}
	free(cookie);
	return 0;
}

#undef COOKIE

static const cookie_io_functions_t _fmo_io_funcs = {
	fmo_read, fmo_write, fmo_seek, fmo_close
};

/* TODO: If we have buffers enabled, it might be worthwile to add a pointer
 * to the FILE in the cookie and have read, write, and seek operate directly
 * on the buffer itself (ie replace the FILE buffer with the cookie buffer
 * and update FILE bufstart, etc. whenever we seek). */

FILE *fmemopen(void *s, size_t len, const char *modes)
{
	FILE *fp;
	register __fmo_cookie *cookie;
	size_t i;

	if ((cookie = malloc(sizeof(__fmo_cookie))) != NULL) {
		cookie->len = len;
		cookie->eof = cookie->pos = 0; /* pos and eof adjusted below. */
		cookie->dynbuf = 0;
		if (((cookie->buf = s) == NULL) && (len > 0)) {
			if ((cookie->buf = malloc(len)) == NULL) {
				goto EXIT_cookie;
			}
			cookie->dynbuf = 1;
			*cookie->buf = 0;	/* If we're appending, treat as empty file. */
		}
		
#ifndef __BCC__
		fp = fopencookie(cookie, modes, _fmo_io_funcs);
#else
		fp = fopencookie(cookie, modes, &_fmo_io_funcs);
#endif
		/* Note: We don't need to worry about locking fp in the thread case
		 * as the only possible access would be a close or flush with
		 * nothing currently in the FILE's write buffer. */

		if (fp != NULL) {
			cookie->fp = fp;
			if ((fp->modeflags & __FLAG_APPEND) && (len > 0)) {
				for (i = 0 ; i < len ; i++) {
					if (cookie->buf[i] == 0) {
						break;
					}
				}
				cookie->eof = cookie->pos = i; /* Adjust eof and pos. */
			}
			return fp;
		}
	}

	if (!s) {
		free(cookie->buf);
	}
 EXIT_cookie:
	free(cookie);

	return NULL;
}

#endif /* __STDIO_GLIBC_CUSTOM_STREAMS */
#endif
/**********************************************************************/
#ifdef L_open_memstream
#ifdef __STDIO_GLIBC_CUSTOM_STREAMS

#define COOKIE ((__oms_cookie *) cookie)

typedef struct {
	char *buf;
	size_t len;
	size_t pos;
	size_t eof;
	char **bufloc;
	size_t *sizeloc;
} __oms_cookie;

/* Nothing to do here, as memstreams are write-only. */
/*  static ssize_t oms_read(void *cookie, char *buf, size_t bufsize) */
/*  { */
/*  } */

static ssize_t oms_write(register void *cookie, const char *buf, size_t bufsize)
{
	register char *newbuf;
	size_t count;

	/* Note: we already know bufsize < SSIZE_MAX... */

	count = COOKIE->len - COOKIE->pos - 1;
	assert(COOKIE->pos < COOKIE->len); /* Always nul-terminate! */

	if (bufsize > count) {
		newbuf = realloc(COOKIE->buf, COOKIE->len + bufsize - count);
		if (newbuf) {
			*COOKIE->bufloc = COOKIE->buf = newbuf;
			COOKIE->len += (bufsize - count);
		} else {
			bufsize = count;
			if (count == 0) {
				__set_errno(EFBIG);	/* TODO: check glibc errno setting... */
				return -1;
			}
		}
	}

	memcpy(COOKIE->buf + COOKIE->pos, buf, bufsize);
	COOKIE->pos += bufsize;

	if (COOKIE->pos > COOKIE->eof) {
		*COOKIE->sizeloc = COOKIE->eof = COOKIE->pos;
		COOKIE->buf[COOKIE->eof] = 0; /* Need to nul-terminate. */
	}

	return bufsize;
}

static int oms_seek(register void *cookie, __offmax_t *pos, int whence)
{
	__offmax_t p = *pos;
	register char *buf;
	size_t leastlen;

	/* Note: fseek already checks that whence is legal, so don't check here
	 * unless debugging. */
	assert(((unsigned int) whence) <= 2);

	if (whence != SEEK_SET) {
		p += (whence == SEEK_CUR) ? COOKIE->pos : /* SEEK_END */ COOKIE->eof;
	}

	/* Note: glibc only allows seeking in the buffer.  We'll actually restrict
	 * to the data. */
	/* Check for offset < 0, offset >= too big (need nul), or overflow... */
	if (((uintmax_t) p) >= SIZE_MAX - 1) {
		return -1;
	}

	leastlen = ((size_t) p) + 1; /* New pos + 1 for nul if necessary. */

	if (leastlen >= COOKIE->len) { /* Need to grow buffer... */
		buf = realloc(COOKIE->buf, leastlen);
		if (buf) {
			*COOKIE->bufloc = COOKIE->buf = buf;
			COOKIE->len = leastlen;
			memset(buf + COOKIE->eof, leastlen - COOKIE->eof, 0); /* 0-fill */
		} else {
			/* TODO: check glibc errno setting... */
			return -1;
		}
	}

	*pos = COOKIE->pos = --leastlen;

	if (leastlen > COOKIE->eof) {
		memset(COOKIE->buf + COOKIE->eof, leastlen - COOKIE->eof, 0);
		*COOKIE->sizeloc = COOKIE->eof;
	}

	return 0;
}

static int oms_close(void *cookie)
{
	free(cookie);
	return 0;
}

#undef COOKIE

static const cookie_io_functions_t _oms_io_funcs = {
	NULL, oms_write, oms_seek, oms_close
};

/* TODO: If we have buffers enabled, it might be worthwile to add a pointer
 * to the FILE in the cookie and operate directly on the buffer itself
 * (ie replace the FILE buffer with the cookie buffer and update FILE bufstart,
 * etc. whenever we seek). */

FILE *open_memstream(char **__restrict bufloc, size_t *__restrict sizeloc)
{
	register __oms_cookie *cookie;
	register FILE *fp;

	if ((cookie = malloc(sizeof(__oms_cookie))) != NULL) {
		if ((cookie->buf = malloc(cookie->len = BUFSIZ)) == NULL) {
			goto EXIT_cookie;
		}
		*cookie->buf = 0;		/* Set nul terminator for buffer. */
		*(cookie->bufloc = bufloc) = cookie->buf;
		*(cookie->sizeloc = sizeloc) = cookie->eof = cookie->pos = 0;
		
#ifndef __BCC__
		fp = fopencookie(cookie, "w", _oms_io_funcs);
#else
		fp = fopencookie(cookie, "w", &_oms_io_funcs);
#endif
		/* Note: We don't need to worry about locking fp in the thread case
		 * as the only possible access would be a close or flush with
		 * nothing currently in the FILE's write buffer. */

		if (fp != NULL) {
			return fp;
		}
	}

	if (cookie->buf != NULL) {
		free(cookie->buf);
	}
 EXIT_cookie:
	free(cookie);

	return NULL;
}

#endif /* __STDIO_GLIBC_CUSTOM_STREAMS */
#endif
/**********************************************************************/
#ifdef L_fopencookie
#ifdef __STDIO_GLIBC_CUSTOM_STREAMS

/* NOTE: GLIBC difference!!! -- fopencookie
 * According to the info pages, glibc allows seeking within buffers even if
 * no seek function is supplied.  We don't. */

/* NOTE: GLIBC difference!!! -- fopencookie
 * When compiled without large file support, the offset pointer for the
 * cookie_seek function is off_t * and not off64_t * as for glibc. */

/* TODO: rewrite _stdio_fopen() to avoid the fopencookie() kludge. */

/* Currently no real reentrancy issues other than a possible double close(). */

#ifndef __BCC__

FILE *fopencookie(void * __restrict cookie, const char * __restrict mode,
				  cookie_io_functions_t io_functions)
{
	FILE *stream;
	int fd;

	if ((stream = _stdio_fopen("/dev/null", mode, NULL, -1)) != NULL) {
		fd = stream->filedes;
		stream->filedes = -1;
		close(fd);
		stream->gcs = io_functions;
		stream->cookie = cookie;
	}

#if !defined(__STDIO_BUFFERS) && !defined(__STDIO_THREADSAFE)
	/* I we don't have buffers or threads, we only need to worry about
	 * custom streams on the open list, as no flushing is necessary and
	 * no locking of possible underlying normal streams need be done.
	 * We do need to explicitly close custom streams on termination of stdio,
	 * and we need to lock the list as it can be modified by fclose(). */
	__STDIO_THREADLOCK_OPENLIST;
	stream->nextopen = _stdio_openlist;	/* New files are inserted at */
	_stdio_openlist = stream;			/*   the head of the list. */
	__STDIO_THREADUNLOCK_OPENLIST;
#endif /* !defined(__STDIO_BUFFERS) && !defined(__STDIO_THREADSAFE) */

	return stream;
}

#else  /* __BCC__ */

/* NOTE: GLIBC difference!!! -- fopencookie (bcc only)
 * Since bcc doesn't support passing of structs, we define fopencookie as a
 * macro in terms of _fopencookie which takes a struct * for the io functions
 * instead.
 */

FILE *_fopencookie(void * __restrict cookie, const char * __restrict mode,
				   register cookie_io_functions_t *io_functions)
{
	register FILE *stream;

	if ((stream = _stdio_fopen("/dev/null", mode, NULL, -1)) != NULL) {
		int fd = stream->filedes;
		stream->filedes = -1;
		close(fd);
		stream->gcs.read  = io_functions->read;
		stream->gcs.write = io_functions->write;
		stream->gcs.seek  = io_functions->seek;
		stream->gcs.close = io_functions->close;
		stream->cookie = cookie;
	}

#if !defined(__STDIO_BUFFERS) && !defined(__STDIO_THREADSAFE)
	/* I we don't have buffers or threads, we only need to worry about
	 * custom streams on the open list, as no flushing is necessary and
	 * no locking of possible underlying normal streams need be done.
	 * We do need to explicitly close custom streams on termination of stdio,
	 * and we need to lock the list as it can be modified by fclose(). */
	__STDIO_THREADLOCK_OPENLIST;
	stream->nextopen = _stdio_openlist;	/* New files are inserted at */
	_stdio_openlist = stream;			/*   the head of the list. */
	__STDIO_THREADUNLOCK_OPENLIST;
#endif /* !defined(__STDIO_BUFFERS) && !defined(__STDIO_THREADSAFE) */

	return stream;
}

#endif  /* __BCC__ */

#endif /* __STDIO_GLIBC_CUSTOM_STREAMS */
#endif
/**********************************************************************/
#ifdef L___fbufsize

/* Not reentrant. */

size_t __fbufsize(register FILE * __restrict stream)
{
#ifdef __STDIO_BUFFERS
	return (stream->modeflags & __FLAG_NBF)
		? 0 : (stream->bufend - stream->bufstart);
#else  /* __STDIO_BUFFERS */
	return 0;
#endif /* __STDIO_BUFFERS */
}

#endif
/**********************************************************************/
#ifdef L___freading

/* No reentrancy issues. */

int __freading(FILE * __restrict stream)
{
	return stream->modeflags & (__FLAG_READING|__FLAG_READONLY);
}

#endif
/**********************************************************************/
#ifdef L___fwriting

/* No reentrancy issues. */

int __fwriting(FILE * __restrict stream)
{
	return stream->modeflags & (__FLAG_WRITING|__FLAG_WRITEONLY);
}

#endif
/**********************************************************************/
#ifdef L___freadable

/* No reentrancy issues. */

int __freadable(FILE * __restrict stream)
{
	return ~(stream->modeflags & __FLAG_WRITEONLY);
}

#endif
/**********************************************************************/
#ifdef L___fwritable

/* No reentrancy issues. */

int __fwritable(FILE * __restrict stream)
{
	return ~(stream->modeflags & __FLAG_READONLY);
}

#endif
/**********************************************************************/
#ifdef L___flbf

/* No reentrancy issues. */

int __flbf(FILE * __restrict stream)
{
#ifdef __STDIO_BUFFERS
	return (stream->modeflags & __FLAG_LBF);
#else  /* __STDIO_BUFFERS */
	/* TODO -- Even though there is no buffer, return flag setting? */
	return __FLAG_NBF;
#endif /* __STDIO_BUFFERS */
}

#endif
/**********************************************************************/
#ifdef L___fpurge

/* Not reentrant. */

void __fpurge(register FILE * __restrict stream)
{
#ifdef __STDIO_BUFFERS
#ifdef __STDIO_PUTC_MACRO
	stream->bufputc =			/* Must disable putc. */
#endif /* __STDIO_PUTC_MACRO */
#ifdef __STDIO_GETC_MACRO
	stream->bufgetc =			/* Must disable getc. */
#endif
	stream->bufpos = stream->bufread = stream->bufstart; /* Reset pointers. */
#endif /* __STDIO_BUFFERS */
	/* Reset r/w flags and clear ungots. */
	stream->modeflags &= ~(__FLAG_READING|__FLAG_WRITING|__MASK_UNGOT);
}

#endif
/**********************************************************************/
#ifdef L___fpending

/* Not reentrant. */

#ifdef __STDIO_WIDE
#warning unlike the glibc version, this __fpending returns bytes in buffer for wide streams too!

link_warning(__fpending, "This version of __fpending returns bytes remaining in buffer for both narrow and wide streams.  glibc's version returns wide chars in buffer for the wide stream case.")

#endif  /* __STDIO_WIDE */

size_t __fpending(register FILE * __restrict stream)
{
#ifdef __STDIO_BUFFERS
	/* TODO -- should we check this?  should we set errno?  just assert? */
	return (stream->modeflags & (__FLAG_READING|__FLAG_READONLY))
		? 0 : (stream->bufpos - stream->bufstart);
#else  /* __STDIO_BUFFERS */
	return 0;
#endif /* __STDIO_BUFFERS */
}

#endif
/**********************************************************************/
#ifdef L__flushlbf

/* No reentrancy issues. */

void _flushlbf(void)
{
#ifdef __STDIO_BUFFERS
	fflush((FILE *) &_stdio_openlist); /* Uses an implementation hack!!! */
#else  /* __STDIO_BUFFERS */
	/* Nothing to do. */
#endif /* __STDIO_BUFFERS */
}

#endif
/**********************************************************************/
#ifdef L___fsetlocking

/* No (serious) reentrancy issues -- return value could be incorrect. */
/* TODO -- fix race */

int __fsetlocking(FILE *stream, int locking_mode)
{
	int old_mode;

	assert((FSETLOCKING_QUERY == 0) && (FSETLOCKING_INTERNAL == 1)
		   && (FSETLOCKING_BYCALLER == 2));

	assert(((unsigned int) locking_mode) <= 2);

	/* Note: don't even bother locking here... */

	old_mode  = stream->user_locking;

	if (locking_mode != FSETLOCKING_QUERY) {
		/* In case we're not debugging, treat any unknown as a request to
		 * set internal locking, in order to match glibc behavior. */
		stream->user_locking = ((locking_mode == FSETLOCKING_BYCALLER)
								? FSETLOCKING_BYCALLER
								: FSETLOCKING_INTERNAL);
	}

	return old_mode;
}

#endif
/**********************************************************************/
#ifdef L_flockfile

void flockfile(FILE *stream)
{
#ifdef __STDIO_THREADSAFE
	pthread_mutex_lock(&stream->lock);
#endif
}

#endif
/**********************************************************************/
#ifdef L_ftrylockfile

int ftrylockfile(FILE *stream)
{
#ifdef __STDIO_THREADSAFE
	return pthread_mutex_trylock(&stream->lock);
#else
	return 1;
#endif
}

#endif
/**********************************************************************/
#ifdef L_funlockfile

void funlockfile(FILE *stream)
{
#ifdef __STDIO_THREADSAFE
	pthread_mutex_unlock(&stream->lock);
#endif
}

#endif
/**********************************************************************/
#ifdef L_getline

ssize_t getline(char **__restrict lineptr, size_t *__restrict n,
				FILE *__restrict stream)
{
	return __getdelim(lineptr, n, '\n', stream);
}

#endif
/**********************************************************************/
#ifdef L_getdelim

weak_alias(__getdelim,getdelim);

#define GETDELIM_GROWBY		64

ssize_t __getdelim(char **__restrict lineptr, size_t *__restrict n,
				   int delimiter, register FILE *__restrict stream)
{
	register char *buf;
	size_t pos;
	int c;

	if (!lineptr || !n || !stream) { /* Be compatable with glibc... even */
		__set_errno(EINVAL);	/* though I think we should assert here */
		return -1;				/* if anything. */
	}

	if (!(buf = *lineptr)) {	/* If passed NULL for buffer, */
		*n = 0;					/* ignore value passed and treat size as 0. */
	}
	pos = 1;			/* Make sure we have space for terminating nul. */

	__STDIO_THREADLOCK(stream);

	do {
		if (pos >= *n) {
			if (!(buf = realloc(buf, *n + GETDELIM_GROWBY))) {
				__set_errno(ENOMEM); /* Emulate old uClibc implementation. */
				break;
			}
			*n += GETDELIM_GROWBY;
			*lineptr = buf;
		}
	} while (((c = getc(stream)) != EOF) && ((buf[pos++ - 1] = c) != delimiter));

	__STDIO_THREADUNLOCK(stream);

	if (--pos) {
		buf[pos] = 0;
		return pos;
	}

	return -1;		/* Either initial realloc failed or first read was EOF. */
}

#endif
/**********************************************************************/
/* my extension functions */
/**********************************************************************/
#ifdef L__stdio_fsfopen
/*
 * Stack|Static File open -- open a file where the FILE is either
 * stack or staticly allocated.
 */

/* No reentrancy issues. */

FILE *_stdio_fsfopen(const char * __restrict filename,
					 const char * __restrict mode,
					 register FILE * __restrict stream)
{
#ifdef __STDIO_BUFFERS
	stream->modeflags = __FLAG_FBF;
#if __STDIO_BUILTIN_BUF_SIZE > 0
	stream->bufstart = stream->builtinbuf;
	stream->bufend = stream->builtinbuf + sizeof(stream->builtinbuf);
#else  /* __STDIO_BUILTIN_BUF_SIZE > 0 */
	stream->bufend = stream->bufstart = NULL;
#endif /* __STDIO_BUILTIN_BUF_SIZE > 0 */
#endif /* __STDIO_BUFFERS */

	return _stdio_fopen(filename, mode, stream, -1);
}
#endif
/**********************************************************************/
/* stdio internal functions */
/**********************************************************************/
#ifdef L__stdio_adjpos
/*
 * ANSI/ISO p. 370: The file positioning indicator is unspecified after
 * a successful call to ungetwc.
 * Note however, that this applies only to _user_ calls to ungetwc.  We
 * need to allow for internal calls by scanf.  So we store the byte count
 * of the first ungot wide char in ungot0_bytes.  If it is 0 (user case)
 * then the file position is treated as unknown.
 */

/* Internal function -- not reentrant. */

int _stdio_adjpos(register FILE * __restrict stream, register __offmax_t *pos)
{
	__offmax_t r;
	int cor = stream->modeflags & __MASK_UNGOT;	/* handle ungots */

#ifdef __STDIO_WIDE
	/* Assumed narrow stream so correct if wide. */
	if (cor && (stream->modeflags & __FLAG_WIDE)) {
		cor = cor - 1 + stream->ungot_width[0];
		if (((stream->modeflags & __MASK_UNGOT) > 1) || stream->ungot[1]) {
			return -1; /* App did ungetwc, so position is indeterminate. */
		}
		assert(stream->ungot_width[0] > 0);
	}
#endif /* __STDIO_WIDE */
#ifdef __STDIO_BUFFERS
	if (stream->modeflags & __FLAG_WRITING) {
		cor -= (stream->bufpos - stream->bufstart); /* pending writes */
	}
	if (stream->modeflags & __FLAG_READING) {
		cor += (stream->bufread - stream->bufpos); /* extra's read */
	}
#endif /* __STDIO_BUFFERS */

	r = *pos;
	return ((*pos -= cor) > r) ? -cor : cor;
}

#endif
/**********************************************************************/
#ifdef L__stdio_lseek
/*
 * This function is only called by fseek and ftell.
 * fseek -- doesn't care about pos val, just success or failure.
 * ftell -- needs pos val but offset == 0 and whence == SET_CUR.
 */

/* Internal function -- not reentrant. */

int _stdio_lseek(register FILE *stream, register __offmax_t *pos, int whence)
{
	__offmax_t res;

#ifdef __STDIO_GLIBC_CUSTOM_STREAMS
	if (stream->cookie != &stream->filedes) {
		return (((stream->gcs.seek == NULL)
				 || ((stream->gcs.seek)(stream->cookie, pos, whence) < 0))
				? -1 : 0);
	}
#endif /* __STDIO_GLIBC_CUSTOM_STREAMS */
#ifdef __STDIO_LARGE_FILES
	res = lseek64(stream->filedes, *pos, whence);
#else
	res = lseek(stream->filedes, *pos, whence);
#endif /* __STDIO_LARGE_FILES */
	return (res >= 0) ? ((*pos = res), 0) : -1;
}

#endif
/**********************************************************************/
#ifdef L__stdio_fread
/*
 * NOTE!!! This routine is meant to be callable by both narrow and wide
 * functions.  However, if called by a wide function, there must be
 * NO pending ungetwc()s!!!
 */

/* Unlike write, it's ok for read to return fewer than bufsize, since
 * we may not need all of them. */
static ssize_t _stdio_READ(register FILE *stream, unsigned char *buf, size_t bufsize)
{
	ssize_t rv;

	if (bufsize == 0) {
		return 0;
	}

	if (bufsize > SSIZE_MAX) {
		bufsize = SSIZE_MAX;
	}

#ifdef __BCC__
 TRY_READ:
#endif
	rv = __READ(stream, buf, bufsize);
	if (rv > 0) {
#ifdef __STDIO_GLIBC_CUSTOM_STREAMS
		assert(rv <= bufsize);	/* buggy user handler... TODO: check? */
		if (rv > bufsize) {	/* Num reported written > number requested */
			rv = bufsize;		/* Treat as a full read??? */
		}
#endif
	} else if (rv == 0) {
		stream->modeflags |= __FLAG_EOF;
	} else {
#ifdef __BCC__
		if (errno == EINTR) {
			goto TRY_READ;
		}
#endif
		stream->modeflags |= __FLAG_ERROR;
		rv = 0;
	}

	return rv;
}

/* Internal function -- not reentrant. */

size_t _stdio_fread(unsigned char *buffer, size_t bytes, register FILE *stream)
{
	__stdio_validate_FILE(stream); /* debugging only */

#ifdef __STDIO_BUFFERS

	if (stream->modeflags 
#ifdef __STDIO_AUTO_RW_TRANSITION
		& (__FLAG_WRITEONLY)
#else  /* __STDIO_AUTO_RW_TRANSITION */
		/* ANSI/ISO and SUSv3 require not currently writing. */
		& (__FLAG_WRITEONLY|__FLAG_WRITING)
#endif /* __STDIO_AUTO_RW_TRANSITION */
		) {
#ifdef __STDIO_PUTC_MACRO
		stream->bufputc = stream->bufstart;	/* Must disable putc. */
#endif /* __STDIO_PUTC_MACRO */
		stream->modeflags |= __FLAG_ERROR;
		/* TODO: This is for posix behavior if writeonly.  To save space, we
		 * use this errno for read attempt while writing, as no errno is
		 * specified by posix for this case, even though the restriction is
		 * mentioned in fopen(). */
		__set_errno(EBADF);
		return 0;
	}

	/* We need to disable putc and getc macros in case of error */
#if defined(__STDIO_PUTC_MACRO) || defined(__STDIO_GETC_MACRO)
#ifdef __STDIO_PUTC_MACRO
	stream->bufputc =
#endif /* __STDIO_GETC_MACRO */
#ifdef __STDIO_GETC_MACRO
	stream->bufgetc =
#endif /* __STDIO_GETC_MACRO */
	stream->bufstart;
#endif /*  defined(__STDIO_PUTC_MACRO) || defined(__STDIO_GETC_MACRO) */

	if (stream->modeflags & __MASK_BUFMODE) {
		/* If the stream is readable and not fully buffered, we must first
		 * flush all line buffered output streams.  Do this before the
		 * error check as this may be a read/write line-buffered stream.
		 * Note: Uses an implementation-specific hack!!! */
		fflush_unlocked((FILE *) &_stdio_openlist);
	}

#ifdef __STDIO_AUTO_RW_TRANSITION
	if ((stream->modeflags & __FLAG_WRITING)
		&& (fflush_unlocked(stream) == EOF)
		) {
		return 0;				/* Fail if we need to fflush but can't. */
	}
#endif /* __STDIO_AUTO_RW_TRANSITION */

	stream->modeflags |= __FLAG_READING; /* Make sure Reading flag is set. */

	{
		register unsigned char *p = (unsigned char *) buffer;

		/* First, grab appropriate ungetc() chars.  NOT FOR WIDE ORIENTATED! */
		while (bytes && (stream->modeflags & __MASK_UNGOT)) {
#ifdef __STDIO_WIDE
			assert(stream->modeflags & __FLAG_NARROW);
#endif /* __STDIO_WIDE */
			*p++ = stream->ungot[(--stream->modeflags) & __MASK_UNGOT];
			stream->ungot[1] = 0;
			--bytes;
		}

		/* Now get any other needed chars from the buffer or the file. */
	FROM_BUF:
		while (bytes && (stream->bufpos < stream->bufread)) {
			--bytes;
			*p++ = *stream->bufpos++;
		}

		if (bytes > 0) {
			ssize_t len;

			/* The buffer is exhausted, but we still need chars.  */
			stream->bufpos = stream->bufread = stream->bufstart;

			if (bytes <= stream->bufend - stream->bufread) {
				/* We have sufficient space in the buffer. */
				len = _stdio_READ(stream, stream->bufread,
								  stream->bufend - stream->bufread);
				if (len > 0) {
					stream->bufread += len;
					goto FROM_BUF;
				}
			} else {
				/* More bytes needed than fit in the buffer, so read */
				/* directly into caller's buffer. */
				len = _stdio_READ(stream, p, bytes);
				if (len > 0) {
					p += len;
					bytes -= len;
					goto FROM_BUF; /* Redundant work, but stops extra read. */
				}
			}
		}

#ifdef __STDIO_GETC_MACRO
		if (!(stream->modeflags & (__FLAG_WIDE|__MASK_UNGOT|__MASK_BUFMODE))) {
			stream->bufgetc = stream->bufread; /* Enable getc macro. */
		}
#endif

		__stdio_validate_FILE(stream); /* debugging only */
		return (p - (unsigned char *)buffer);
	}

#else  /* __STDIO_BUFFERS --------------------------------------- */

	if (stream->modeflags 
#ifdef __STDIO_AUTO_RW_TRANSITION
		& (__FLAG_WRITEONLY)
#else  /* __STDIO_AUTO_RW_TRANSITION */
		/* ANSI/ISO and SUSv3 require not currently writing. */
		& (__FLAG_WRITEONLY|__FLAG_WRITING)
#endif /* __STDIO_AUTO_RW_TRANSITION */
		) {
		stream->modeflags |= __FLAG_ERROR;
		/* TODO: This is for posix behavior if writeonly.  To save space, we
		 * use this errno for read attempt while writing, as no errno is
		 * specified by posix for this case, even though the restriction is
		 * mentioned in fopen(). */
		__set_errno(EBADF);
		return 0;
	}

#ifdef __STDIO_AUTO_RW_TRANSITION
	stream->modeflags &= ~(__FLAG_WRITING);	/* Make sure Writing flag clear. */
#endif /* __STDIO_AUTO_RW_TRANSITION */

	stream->modeflags |= __FLAG_READING; /* Make sure Reading flag is set. */

	{
		register unsigned char *p = (unsigned char *) buffer;

		/* First, grab appropriate ungetc() chars.  NOT FOR WIDE ORIENTATED! */
		while (bytes && (stream->modeflags & __MASK_UNGOT)) {
#ifdef __STDIO_WIDE
			assert(stream->modeflags & __FLAG_NARROW);
#endif /* __STDIO_WIDE */
			*p++ = stream->ungot[(--stream->modeflags) & __MASK_UNGOT];
			stream->ungot[1] = 0;
			--bytes;
		}	

		while (bytes > 0) {
			ssize_t len = _stdio_READ(stream, p, (unsigned) bytes);
			if (len == 0) {
				break;
			}
			p += len;
			bytes -= len;
		}

		__stdio_validate_FILE(stream); /* debugging only */
		return (p - (unsigned char *)buffer);
	}

#endif /* __STDIO_BUFFERS */
}

#endif
/**********************************************************************/
#ifdef L__stdio_fwrite
/*
 * If buffer == NULL, attempt to fflush and return number of chars
 * remaining in buffer (0 if successful fflush).
 */

/* WARNING!!!! Current standards say that termination due to an asyncronous
 * signal may not result in stdio streams being flushed.  This libary makes
 * an effort to do so but there is no way, short of blocking signals for
 * each _stdio_fwrite call, that we can maintain the correct state if a
 * signal is recieved mid-call.  So any stream in mid-_stdio_fwrite could
 * not some flush data or even duplicate-flush some data.  It is possible
 * to avoid the duplicate-flush case by setting/clearing the stream
 * error flag before/after the write process, but it doesn't seem worth
 * the trouble. */

/* Like standard write, but always does a full write unless error plus
 *deals correctly with bufsize > SSIZE_MAX... not much on an issue on linux
 * but definitly could be on Elks.  Also on Elks, always loops for EINTR..
 * Returns number of bytes written, so a short write indicates an error */
static size_t _stdio_WRITE(register FILE *stream,
						   register const unsigned char *buf, size_t bufsize)
{
	size_t todo;
	ssize_t rv, stodo;

	todo = bufsize;

	while (todo) {
		stodo = (todo <= SSIZE_MAX) ? todo : SSIZE_MAX;
		rv = __WRITE(stream, buf, stodo);
		if (rv >= 0) {
#ifdef __STDIO_GLIBC_CUSTOM_STREAMS
			assert(rv <= stodo);	/* buggy user handler... TODO: check? */
			if (rv > stodo) {	/* Num reported written > number requested */
				rv = stodo;		/* Treat as a full write??? */
			}
#endif
			todo -= rv;
			buf += rv;
		} else
#ifdef __BCC__
			if (errno != EINTR)
#endif
		{
			stream->modeflags |= __FLAG_ERROR;
			break;
		}
	}

	return bufsize - todo;
}

/* Internal function -- not reentrant. */

size_t _stdio_fwrite(const unsigned char *buffer, size_t bytes,
					 register FILE *stream)
{
#ifdef __STDIO_BUFFERS
	register const unsigned char *p;

	__stdio_validate_FILE(stream); /* debugging only */

	if ((stream->modeflags & __FLAG_READONLY)
#ifndef __STDIO_AUTO_RW_TRANSITION
	/* ANSI/ISO requires either at EOF or currently not reading. */
		|| ((stream->modeflags & (__FLAG_READING|__FLAG_EOF))
			== __FLAG_READING)
#endif /* __STDIO_AUTO_RW_TRANSITION */
		) {
		stream->modeflags |= __FLAG_ERROR;
		/* TODO: This is for posix behavior if readonly.  To save space, we
		 * use this errno for write attempt while reading, as no errno is
		 * specified by posix for this case, even though the restriction is
		 * mentioned in fopen(). */
		__set_errno(EBADF);
		return 0;
	}

#ifdef __STDIO_AUTO_RW_TRANSITION
	/* If reading, deal with ungots and read-buffered chars. */
	if (stream->modeflags & __FLAG_READING) {
		if (((stream->bufpos < stream->bufread)
			 || (stream->modeflags & __MASK_UNGOT))
			/* If appending, we might as well seek to end to save a seek. */
			/* TODO: set EOF in fseek when appropriate? */
			&& fseek(stream, 0L, 
					 ((stream->modeflags & __FLAG_APPEND)
					  ? SEEK_END : SEEK_CUR))
			) {
			/* Note: This differs from glibc's apparent behavior of
			   not setting the error flag and discarding the buffered
			   read data. */
			stream->modeflags |= __FLAG_ERROR; /* fseek may not set this. */
			return 0;			/* Fail if we need to fseek but can't. */
		}
		/* Always reset even if fseek called (saves a test). */
#ifdef __STDIO_GETC_MACRO
		stream->bufgetc =
#endif /* __STDIO_GETC_MACRO */
		stream->bufpos = stream->bufread = stream->bufstart;
	}
#endif

#ifdef __STDIO_PUTC_MACRO
	/* We need to disable putc macro in case of error */
	stream->bufputc = stream->bufstart;
#endif /* __STDIO_GETC_MACRO */

	/* Clear both reading and writing flags.  We need to clear the writing
	 * flag in case we're fflush()ing or in case of an error. */
	stream->modeflags &= ~(__FLAG_READING|__FLAG_WRITING);

	{
		const unsigned char *buf0 = buffer;

		if (!buffer) {				/* fflush the stream */
		FFLUSH:
			{
				size_t count = stream->bufpos - stream->bufstart;
				p = stream->bufstart;

				if (stream->filedes == -2) { /* TODO -- document this hack! */
					stream->modeflags |= __FLAG_WRITING;
					return (!buffer) ? 0 : ((buffer - buf0) + bytes);
				}

				{
					size_t rv = _stdio_WRITE(stream, p, count);
					p += rv;
					count -= rv;
				}
			
				stream->bufpos = stream->bufstart;
				while (count) {
					*stream->bufpos++ = *p++;
					--count;
				}

				if (!buffer) {	/* fflush case... */
					__stdio_validate_FILE(stream); /* debugging only */
					return stream->bufpos - stream->bufstart;
				}
			}
		}

#if 1
		/* TODO: If the stream is buffered, we may be able to omit. */
		if ((stream->bufpos == stream->bufstart) /* buf empty */
			&& (stream->bufend - stream->bufstart <= bytes)	/* fills */
			&& (stream->filedes != -2)) { /* not strinf fake file */
			/* so want to do a direct write of supplied buffer */
			{
				size_t rv = _stdio_WRITE(stream, buffer, bytes);
				buffer += rv;
				bytes -= rv;
			}
		} else
#endif
		/* otherwise buffer not empty and/or data fits */
		{
			size_t count = stream->bufend - stream->bufpos;
			p = buffer;

			if (count > bytes) {
				count = bytes;
			}
			bytes -= count;

			while (count) {
				*stream->bufpos++ = *buffer++;
				--count;
			}

			if (bytes) {
				goto FFLUSH;
			}

			if (stream->modeflags & __FLAG_LBF) {
				while (p < buffer) { /* check for newline. */
					if (*p++ == '\n') {
						goto FFLUSH;
					}
				}
			}
		}

#ifdef __STDIO_PUTC_MACRO
		if (!(stream->modeflags & (__FLAG_WIDE|__MASK_BUFMODE))) {
			/* Not wide, no errors and fully buffered, so enable putc macro. */
			stream->bufputc = stream->bufend;
		}
#endif /* __STDIO_GETC_MACRO */
		stream->modeflags |= __FLAG_WRITING; /* Ensure Writing flag is set. */

		__stdio_validate_FILE(stream); /* debugging only */
		return buffer - buf0;

	}

#else  /* __STDIO_BUFFERS --------------------------------------- */

	__stdio_validate_FILE(stream); /* debugging only */

	if ((stream->modeflags & __FLAG_READONLY)
#ifndef __STDIO_AUTO_RW_TRANSITION
	/* ANSI/ISO requires either at EOF or currently not reading. */
		|| ((stream->modeflags & (__FLAG_READING|__FLAG_EOF))
			== __FLAG_READING)
#endif /* __STDIO_AUTO_RW_TRANSITION */
		) {
		stream->modeflags |= __FLAG_ERROR;
		/* TODO: This is for posix behavior if readonly.  To save space, we
		 * use this errno for write attempt while reading, as no errno is
		 * specified by posix for this case, even though the restriction is
		 * mentioned in fopen(). */
		__set_errno(EBADF);
		return 0;
	}

	/* We always clear the reading flag in case at EOF. */
	stream->modeflags &= ~(__FLAG_READING);
	/* Unlike the buffered case, we set the writing flag now since we don't
	 * need to do anything here for fflush(). */
	stream->modeflags |= __FLAG_WRITING;

	{
		register unsigned char *p = (unsigned char *) buffer;

		ssize_t rv = _stdio_WRITE(stream, p, bytes);

		p += rv;
		bytes -= rv;

		__stdio_validate_FILE(stream); /* debugging only */
		return (p - (unsigned char *)buffer);
	}

#endif /* __STDIO_BUFFERS *****************************************/
}

#endif
/**********************************************************************/
#ifdef L__stdio_init

/* Internal functions -- _stdio_init() and __stdio_validate_FILE
 * are not reentrant, but _stdio_term() is through fflush().
 * Also, the _cs_{read|write|close} functions are not reentrant. */

#ifndef NDEBUG
void __stdio_validate_FILE(FILE *stream)
{
	if (stream->filedes == -2) { /* fake FILE for sprintf, scanf, etc. */
		return;
	}

	__STDIO_THREADLOCK(stream);

#ifdef __STDIO_BUFFERS
	assert(stream->bufstart <= stream->bufread);
	if (stream->modeflags & (__FLAG_READING)) {
		assert(stream->bufpos <= stream->bufread);
	}
	assert(stream->bufread <= stream->bufend);
	assert(stream->bufpos <= stream->bufend);
	if ((stream->modeflags & __MASK_BUFMODE) == __FLAG_NBF) {
		assert(stream->bufstart == stream->bufend);
	}
	assert((stream->modeflags & __MASK_BUFMODE) <= __FLAG_NBF);
#endif
#ifdef __STDIO_PUTC_MACRO
	assert(stream->bufstart <= stream->bufputc);
	assert(stream->bufputc <= stream->bufend);
	if (stream->bufstart < stream->bufputc) {
		assert(stream->bufputc == stream->bufend);
		assert(stream->modeflags & (__FLAG_WRITING));
		assert(!(stream->modeflags
				 & (__FLAG_WIDE|__MASK_BUFMODE|__MASK_UNGOT|__FLAG_READONLY))
			   );
	}
#endif
#ifdef __STDIO_GETC_MACRO
	assert(stream->bufstart <= stream->bufgetc);
	assert(stream->bufgetc <= stream->bufread);
	if (stream->bufstart < stream->bufgetc) {
		assert(stream->modeflags & (__FLAG_READING));
		assert(!(stream->modeflags
				 & (__FLAG_WIDE|__MASK_BUFMODE|__MASK_UNGOT|__FLAG_WRITEONLY))
			   );
	}
#endif
	assert((stream->modeflags & __MASK_UNGOT) != __MASK_UNGOT);
	if (stream->modeflags & __MASK_UNGOT1) {
		assert(stream->ungot[1] <= 1);
	}
	if (stream->modeflags & __MASK_UNGOT) {
		assert(!(stream->modeflags & __FLAG_EOF));
	}
	assert((stream->modeflags & (__FLAG_READONLY|__FLAG_WRITEONLY))
		   != (__FLAG_READONLY|__FLAG_WRITEONLY));

	/* TODO -- filepos?  ungot_width?  filedes?  nextopen? */

	__STDIO_THREADUNLOCK(stream);
}
#endif

#ifdef __STDIO_GLIBC_CUSTOM_STREAMS
ssize_t _cs_read(void *cookie, char *buf, size_t bufsize)
{
	return read(*((int *) cookie), buf, bufsize);
}

ssize_t _cs_write(void *cookie, const char *buf, size_t bufsize)
{
	return write(*((int *) cookie), (char *) buf, bufsize);
}

int _cs_close(void *cookie)
{
	return close(*((int *) cookie));
}
#endif /* __STDIO_GLIBC_CUSTOM_STREAMS */

#ifdef __STDIO_BUFFERS
static unsigned char _fixed_buffers[2 * BUFSIZ];
#define bufin (_fixed_buffers)
#define bufout (_fixed_buffers + BUFSIZ)
#endif /* __STDIO_BUFFERS */

static FILE _stdio_streams[] = {
	__STDIO_INIT_FILE_STRUCT(_stdio_streams[0], __FLAG_LBF|__FLAG_READONLY, \
							 0, _stdio_streams + 1, bufin, BUFSIZ ),
	__STDIO_INIT_FILE_STRUCT(_stdio_streams[1], __FLAG_LBF|__FLAG_WRITEONLY, \
							 1, _stdio_streams + 2, bufout, BUFSIZ ), 
	__STDIO_INIT_FILE_STRUCT(_stdio_streams[2], __FLAG_NBF|__FLAG_WRITEONLY, \
							 2, 0, 0, 0 )
};

FILE *stdin = _stdio_streams + 0;
FILE *stdout = _stdio_streams + 1;
FILE *stderr = _stdio_streams + 2;

#if defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS)

#ifdef __STDIO_BUFFERS
FILE *_stdio_openlist = _stdio_streams;
#else  /* __STDIO_BUFFERS */
FILE *_stdio_openlist = NULL;
#endif /* __STDIO_BUFFERS */

#ifdef __STDIO_THREADSAFE
pthread_mutex_t _stdio_openlist_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;


void __stdio_init_mutex(pthread_mutex_t *m)
{
	static const pthread_mutex_t __stdio_mutex_initializer
		= PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;

	memcpy(m, &__stdio_mutex_initializer, sizeof(__stdio_mutex_initializer));
}
#endif /* __STDIO_THREADSAFE */

/* TODO - do we need to lock things, or do we just assume we're the only
 * remaining thread? */

/* Note: We assume here that we are the only remaining thread. */
void _stdio_term(void)
{
#if defined(__STDIO_GLIBC_CUSTOM_STREAMS) || defined(__STDIO_THREADSAFE)
	register FILE *ptr;
#endif

	/* TODO: if called via a signal handler for a signal mid _stdio_fwrite,
	 * the stream may be in an unstable state... what do we do?
	 * perhaps set error flag before and clear when done if successful? */

#ifdef __STDIO_THREADSAFE
	/* First, forceably unlock the open file list and all files.
	 * Note: Set locking mode to "by caller" to save some overhead later. */
	__stdio_init_mutex(&_stdio_openlist_lock);
	for (ptr = _stdio_openlist ; ptr ; ptr = ptr->nextopen ) {
		ptr->user_locking = FSETLOCKING_BYCALLER;
		__stdio_init_mutex(&ptr->lock);
	}
#endif /* __STDIO_THREADSAFE */

#ifdef __STDIO_BUFFERS
	/* TODO -- set an alarm and flush each file "by hand"? to avoid blocking? */

	/* Now flush all streams. */
	fflush_unlocked(NULL);
#endif /* __STDIO_BUFFERS */

	/* Next close all custom streams in case of any special cleanup, but
	 * don't use fclose() because that pulls in free and malloc.  Also,
	 * don't worry about removing them from the list.  Just set the cookie
	 * pointer to NULL so that an error will be generated if someone tries
	 * to use the stream. */
#ifdef __STDIO_GLIBC_CUSTOM_STREAMS
	for (ptr = _stdio_openlist ; ptr ; ptr = ptr->nextopen ) {
		if (ptr->cookie != &ptr->filedes) {	/* custom stream */
			__CLOSE(ptr);
			ptr->cookie = NULL;	/* Generate an error if used later. */
#if 0
/*  #ifdef __STDIO_BUFFERS */
		} else {
			/* TODO: "unbuffer" files like glibc does?  Inconsistent with
			 * custom stream handling above, but that's necessary to deal
			 * with special user-defined close behavior. */
			stream->bufpos = stream->bufread = stream->bufend
#ifdef __STDIO_GETC_MACRO
				= stream->bufgetc
#endif
#ifdef __STDIO_PUTC_MACRO
				= stream->bufputc
#endif
				= stream->bufstart;
#endif /* __STDIO_BUFFERS */
		}
	}
#endif /* __STDIO_GLIBC_CUSTOM_STREAMS */
}


#if defined(__STDIO_BUFFERS) || !defined(__UCLIBC__)
void _stdio_init(void)
{
#ifdef __STDIO_BUFFERS
	/* stdin and stdout uses line buffering when connected to a tty. */
	_stdio_streams[0].modeflags ^= (1-isatty(0)) * __FLAG_LBF;
	_stdio_streams[1].modeflags ^= (1-isatty(1)) * __FLAG_LBF;
#endif /* __STDIO_BUFFERS */
#ifndef __UCLIBC__
/* __stdio_term is automatically when exiting if stdio is used.
 * See misc/internals/__uClibc_main.c and and stdlib/atexit.c. */
	atexit(_stdio_term);
#endif /* __UCLIBC__ */
}
#endif /* defined(__STDIO_BUFFERS) || !defined(__UCLIBC__) */
#endif /* defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS) */

#endif
/**********************************************************************/
/* ANSI/ISO functions. */
/**********************************************************************/
#ifdef L_remove
#include <unistd.h>
#include <errno.h>

/* No reentrancy issues. */

int remove(register const char *filename)
{
	int old_errno = errno;

	/* SUSv3 says equivalent to rmdir() if a directory, and unlink()
	 * otherwise.  Hence, we need to try rmdir() first. */

	return (((rmdir(filename) == 0)
			 || ((errno == ENOTDIR)
				 && ((__set_errno(old_errno), unlink(filename)) == 0)))
			? 0 : -1);
}
#endif
/**********************************************************************/
/* rename is a syscall
#ifdef L_rename
int rename(const char *old, const char *new);
#endif
*/
/**********************************************************************/
/* TODO: tmpfile */
/*  #ifdef L_tmpfile */
/*  FILE *tmpfile(void); */
/*  #endif */
/**********************************************************************/
/* TODO: tmpname */
/*  #ifdef L_tmpname */
/*  char *tmpname(char *s); */
/*  #endif */
/**********************************************************************/
#ifdef L_fclose

/* We need to be careful here to avoid deadlock when threading, as we
 * need to lock both the file and the open file list.  This can clash
 * with fflush.  Since fflush is much more common, we do the extra
 * work here. */

int fclose(register FILE *stream)
{
#if defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS)

	register FILE *ptr;
	int rv = 0;

#ifdef __STDIO_THREADSAFE
	/* Need two non-heirchal mutexs... be careful to avoid deadlock*/
	do {
		__STDIO_THREADLOCK(stream);
		if (__STDIO_THREADTRYLOCK_OPENLIST == 0) {
			break;
		}
		__STDIO_THREADUNLOCK(stream);
		usleep(10000);
	} while (1);
#endif /* __STDIO_THREADSAFE */

	__stdio_validate_FILE(stream); /* debugging only */

#ifdef __STDIO_BUFFERS
	if (stream->modeflags & __FLAG_WRITING) {
		rv = fflush_unlocked(stream); /* Write any pending buffered chars. */
	}								  /* Also disables putc macro if used. */

#ifdef __STDIO_GETC_MACRO
	/* Not necessary after fflush, but always do this to reduce size. */
	stream->bufgetc = stream->bufstart;	/* Disable getc macro for safety. */
#endif /* __STDIO_GETC_MACRO */
#endif /* __STDIO_BUFFERS */

	/* Remove file from open list before closing file descriptor. */
	ptr = _stdio_openlist;
	if (ptr == stream) {
		_stdio_openlist = stream->nextopen;
	} else {
		while (ptr) {
			if (ptr->nextopen == stream) {
				ptr->nextopen = stream->nextopen;
				break;
			}
			ptr = ptr->nextopen;
		}
	}
	__STDIO_THREADUNLOCK_OPENLIST; /* We're done with the open file list. */

	if (__CLOSE(stream) < 0) {	/* Must close even if fflush failed. */
		rv = EOF;
	}
#ifdef __STDIO_GLIBC_CUSTOM_STREAMS
	stream->cookie = NULL;		/* To aid debugging... */
#endif
	stream->filedes = -1;		/* To aid debugging... */

#ifdef __STDIO_BUFFERS
	if (stream->modeflags & __FLAG_FREEBUF) {
		free(stream->bufstart);
	}
#endif /* __STDIO_BUFFERS */

	/* TODO -- leave the stream locked to catch any dangling refs? */
	__STDIO_THREADUNLOCK(stream);

	/* At this point, any dangling refs to the stream are the result of
	 * a programming bug... so free the unlocked stream. */
	if (stream->modeflags & __FLAG_FREEFILE) {
		free(stream);
	}

	return rv;

#else  /* defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS) */

	int rv = 0;

	__STDIO_THREADLOCK(stream);

	__stdio_validate_FILE(stream); /* debugging only */

	if (__CLOSE(stream) < 0) {	/* Must close even if fflush failed. */
		rv = EOF;
	}

#ifdef __STDIO_GLIBC_CUSTOM_STREAMS
	stream->cookie = NULL;		/* To aid debugging... */
#endif
	stream->filedes = -1;		/* To aid debugging... */

	__STDIO_THREADUNLOCK(stream);

	/* At this point, any dangling refs to the stream are the result of
	 * a programming bug... so free the unlocked stream. */
	if (stream->modeflags & __FLAG_FREEFILE) {
		free(stream);
	}

	return rv;

#endif /* defined(__STDIO_BUFFERS) || defined(__STDIO_GLIBC_CUSTOM_STREAMS )*/
}

#endif
/**********************************************************************/
#ifdef L_fflush

/*
 * Special cases:
 *   stream == NULL means fflush all writing streams (ANSI/ISO).
 *   stream == (FILE *) &_stdio_openlist -- implementation-specific hack
 *      meaning fflush all line buffered writing streams
 */

/*
 * NOTE: ANSI/ISO difference!!!  According to the standard, fflush is only
 * defined for write-only streams, or read/write streams whose last op
 * was a write.  However, reading is allowed for a read/write stream if
 * a file positioning operation was done (fseek, fsetpos) even though there
 * is no guarantee of flushing the write data in that case.  Hence, for
 * this case we keep a flag to indicate whether or not the buffer needs to
 * be flushed even if the last operation was a read.  This falls under the
 * implementation-defined behavior.  Otherwise, we would need to flush
 * every time we did fseek, etc. even if we were still in the buffer's range.
 */

/* Since the stream pointer arg is allowed to be NULL, or the address of the
 * stdio open file list if stdio is buffered in this implementation, we can't
 * use the UNLOCKED() macro here. */

#ifndef __STDIO_THREADSAFE
strong_alias(fflush_unlocked,fflush)
#else  /* __STDIO_THREADSAFE */
int fflush(register FILE *stream)
{
	int retval;

	if ((stream != NULL)
#ifdef __STDIO_BUFFERS
		&& (stream != (FILE *) &_stdio_openlist)
#endif /* __STDIO_BUFFERS */
		) {
		__STDIO_THREADLOCK(stream);
		retval = fflush_unlocked(stream);
		__STDIO_THREADUNLOCK(stream);
	} else {
		retval = fflush_unlocked(stream);
	}

	return retval;
}
#endif /* __STDIO_THREADSAFE */

int fflush_unlocked(register FILE *stream)
{
#ifdef __STDIO_BUFFERS

	int rv = 0;
	unsigned short mask = (__FLAG_NBF|__FLAG_LBF);

#ifndef NDEBUG
	if ((stream != NULL) && (stream != (FILE *) &_stdio_openlist)) {
		__stdio_validate_FILE(stream); /* debugging only */
	}
#endif

	if (stream == (FILE *) &_stdio_openlist) { /* fflush all line-buffered */
		stream = NULL;
		mask = __FLAG_LBF;
	}

	if (stream == NULL) {		/* flush all (line) buffered writing streams */
		/* Note -- We have to lock the list even in the unlocked function. */
		__STDIO_THREADLOCK_OPENLIST;
		/* TODO -- Can we work around locking the list to avoid keeping it
		 * locked if the write blocks? */
		for (stream = _stdio_openlist; stream; stream = stream->nextopen) {
			if (((stream->modeflags ^ __FLAG_NBF) & mask)
				&& (stream->modeflags & __FLAG_WRITING)
				&& fflush(stream)) {
				rv = EOF;
			}
		}
		__STDIO_THREADUNLOCK_OPENLIST;
	} else if (stream->modeflags & __FLAG_WRITING) {
		if (_stdio_fwrite(NULL, 0, stream) > 0) { /* flush buffer contents. */
			rv = -1;			/* Not all chars written. */
		}
	} else if (stream->modeflags & (__FLAG_READONLY|__FLAG_READING)) {
		/* TODO - __FLAG_READING too?  check glibc behavior */
		/* 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 */
		__set_errno(EBADF);
		rv = -1;
	}

#ifndef NDEBUG
	if ((stream != NULL) && (stream != (FILE *) &_stdio_openlist)) {
		__stdio_validate_FILE(stream); /* debugging only */
	}
#endif
	return rv;

#else  /* __STDIO_BUFFERS --------------------------------------- */

#ifndef NDEBUG
	if ((stream != NULL) && (stream != (FILE *) &_stdio_openlist)) {
		__stdio_validate_FILE(stream); /* debugging only */
	}
#endif

	/* TODO -- check glibc behavior regarding error indicator */
	return ((stream != NULL)
			&& (stream->modeflags & (__FLAG_READONLY|__FLAG_READING))
			? ((stream->modeflags |= __FLAG_ERROR), __set_errno(EBADF), EOF)
			: 0 );

#endif /* __STDIO_BUFFERS */
}
#endif
/**********************************************************************/
#ifdef L_fopen

/* No reentrancy issues. */

FILE *fopen(const char * __restrict filename, const char * __restrict mode)
{
	return _stdio_fopen(filename, mode, NULL, -1);
}

#endif
/**********************************************************************/
#ifdef L__stdio_fopen

/*
 * Cases:
 *  fopen    : filename != NULL, stream == NULL, filedes == -1
 *  freopen  : filename != NULL, stream != NULL, filedes == -1
 *  fdopen   : filename == NULL, stream == NULL, filedes valid
 *  fsfopen  : filename != NULL, stream != NULL, filedes == -1
 *  fopen64  : filename != NULL, stream == NULL, filedes == -2
 */

#if O_ACCMODE != 3 || O_RDONLY != 0 || O_WRONLY != 1 || O_RDWR != 2
#error Assumption violated - mode constants
#endif

/* Internal function -- reentrant (locks open file list) */

FILE *_stdio_fopen(const char * __restrict filename,
				   register const char * __restrict mode,
				   register FILE * __restrict stream, int filedes)
{
	__mode_t open_mode;

	/* parse mode */
	open_mode = O_RDONLY;
	if (*mode != 'r') {			/* not read */
		open_mode = (O_WRONLY | O_CREAT | O_TRUNC);
		if (*mode != 'w') {		/* not write (create or truncate)*/
			open_mode = (O_WRONLY | O_CREAT | O_APPEND);
			if (*mode != 'a') {	/* not write (create or append) */
				__set_errno(EINVAL); /* then illegal mode */
				if (stream) {	/* If this is freopen, free the stream. */
					goto FREE_STREAM;
				}
				return NULL;
			}
		}
	}

	if ((*++mode == 'b')) {		/* binary mode (NOP currently) */
		++mode;
	}

	if (*mode == '+') {			/* read-write */
		++mode;
		open_mode &= ~(O_RDONLY | O_WRONLY);
		open_mode |= O_RDWR;
	}

#if defined(__STDIO_GNU_FEATURE) || defined(__STDIO_FOPEN_LARGEFILE_MODE)
	while (*mode) {				/* ignore everything else except ... */
#ifdef __STDIO_FOPEN_EXCLUSIVE_MODE
		if (*mode++ == 'x') {	/* open exclusive -- glibc extension */
			open_mode |= O_EXCL;
		}
#endif /* __STDIO_FOPEN_EXCLUSIVE_MODE */
#ifdef __STDIO_FOPEN_LARGEFILE_MODE
		if (*mode++ == 'F') {	/* open large file */
			open_mode |= O_LARGEFILE;
		}
#endif /* __STDIO_FOPEN_LARGEFILE_MODE */
	}
#endif /* __STDIO_FOPEN_EXCLUSIVE_MODE or __STDIO_FOPEN_LARGEFILE_MODE def'd */

#ifdef __BCC__
	mode = filename;			/* TODO:  help BCC with register allocation. */
#define filename mode
#endif /* __BCC__ */

	if (!stream) {				/* Need to allocate a FILE. */
#ifdef __STDIO_BUFFERS
		if ((stream = malloc(sizeof(FILE))) == NULL) {
			return stream;
		}
		stream->modeflags = __FLAG_FREEFILE;
		if ((stream->bufstart = malloc(BUFSIZ)) != 0) {
			stream->bufend = stream->bufstart + BUFSIZ;
			stream->modeflags |= __FLAG_FREEBUF;
		} else {
#if __STDIO_BUILTIN_BUF_SIZE > 0
			stream->bufstart = stream->unbuf;
			stream->bufend = stream->unbuf + sizeof(stream->unbuf);
#else  /* __STDIO_BUILTIN_BUF_SIZE > 0 */
			stream->bufstart = stream->bufend = NULL;
#endif /* __STDIO_BUILTIN_BUF_SIZE > 0 */
		}
#else  /* __STDIO_BUFFERS */
		if ((stream = malloc(sizeof(FILE))) == NULL) {
			return stream;
		}
		stream->modeflags = __FLAG_FREEFILE;
#endif /* __STDIO_BUFFERS */
	}

	if (filedes >= 0) {			/* Handle fdopen trickery. */
		/*
		 * NOTE: it is insufficient to just check R/W/RW agreement.
		 * We must also check for append mode agreement, as well as
		 * largefile agreement if applicable.
		 */
		int i = (open_mode & (O_ACCMODE|O_APPEND|O_LARGEFILE)) + 1;

		if ((i & (((int) filename) + 1)) != i) {
			__set_errno(EINVAL);
			filedes = -1;
		}
		stream->filedes = filedes;
	} else {
#ifdef __STDIO_LARGE_FILES
		if (filedes < -1) {
			open_mode |= O_LARGEFILE;
		}
#endif /* __STDIO_LARGE_FILES */
		stream->filedes = open(filename, open_mode, 0666);
	}

	if (stream->filedes < 0) {
	FREE_STREAM:
#ifdef __STDIO_BUFFERS
		if (stream->modeflags & __FLAG_FREEBUF) {
			free(stream->bufstart);
		}
#endif /* __STDIO_BUFFERS */
		if (stream->modeflags & __FLAG_FREEFILE) {
			free(stream);
		}
		return NULL;
	}

	stream->modeflags |=
#ifdef __STDIO_BUFFERS
		(isatty(stream->filedes) * __FLAG_LBF) |
#endif /* __STDIO_BUFFERS */
#if (O_APPEND == __FLAG_APPEND) \
&& ((O_LARGEFILE == __FLAG_LARGEFILE) || (O_LARGEFILE == 0))
		(open_mode & (O_APPEND|O_LARGEFILE)) | /* i386 linux and elks */
#else  /* (O_APPEND == __FLAG_APPEND) && (O_LARGEFILE == __FLAG_LARGEFILE) */
		((open_mode & O_APPEND) ? __FLAG_APPEND : 0) |
#ifdef __STDIO_LARGE_FILES
		((open_mode & O_LARGEFILE) ? __FLAG_LARGEFILE : 0) |
#endif /* __STDIO_LARGE_FILES */
#endif /* (O_APPEND == __FLAG_APPEND) && (O_LARGEFILE == __FLAG_LARGEFILE) */
		((((open_mode & O_ACCMODE) + 1) ^ 0x03) * __FLAG_WRITEONLY);

#ifdef __STDIO_BUFFERS
#ifdef __STDIO_GETC_MACRO
	stream->bufgetc =
#endif
#ifdef __STDIO_PUTC_MACRO
	stream->bufputc =
#endif
	stream->bufp