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/* Copyright (C) 2002 Manuel Novoa III
*
* 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!
*
* Besides uClibc, I'm using this code in my libc for elks, which is
* a 16-bit environment with a fairly limited compiler. It would make
* things much easier for me if this file isn't modified unnecessarily.
* In particular, please put any new or replacement functions somewhere
* else, and modify the makefile to use your version instead.
* Thanks. Manuel
*
* ATTENTION! ATTENTION! ATTENTION! ATTENTION! ATTENTION! */
/* Nov 21, 2002
*
* Reimplement fputwc and fputws in terms of internal function _wstdio_fwrite.
*/
/*
* ANSI/ISO C99 says
9 Although both text and binary wide�oriented streams are conceptually sequences of wide
characters, the external file associated with a wide�oriented stream is a sequence of
multibyte characters, generalized as follows:
--- Multibyte encodings within files may contain embedded null bytes (unlike multibyte
encodings valid for use internal to the program).
--- A file need not begin nor end in the initial shift state. 225)
* How do we deal with this?
* Should auto_wr_transition init the mbstate object?
*/
#include <stdio.h>
#include <wchar.h>
#include <limits.h>
#include <errno.h>
#include <assert.h>
libc_hidden_proto(fgetwc_unlocked)
libc_hidden_proto(fputwc_unlocked)
#ifndef __UCLIBC_HAS_THREADS__
#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 /* __UCLIBC_HAS_THREADS__ */
#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 /* __UCLIBC_HAS_THREADS__ */
#ifndef __STDIO_BUFFERS
#error stdio buffers are currently required for wide i/o
#endif
/**********************************************************************/
#ifdef L_fwide
/* TODO: According to SUSv3 should return EBADF if invalid stream. */
int fwide(register FILE *stream, int mode)
{
__STDIO_THREADLOCK(stream);
if (mode && !(stream->modeflags & (__FLAG_WIDE|__FLAG_NARROW))) {
stream->modeflags |= ((mode > 0) ? __FLAG_WIDE : __FLAG_NARROW);
}
mode = (stream->modeflags & __FLAG_WIDE)
- (stream->modeflags & __FLAG_NARROW);
__STDIO_THREADUNLOCK(stream);
return mode;
}
#endif
/**********************************************************************/
#ifdef L_fgetwc
static void munge_stream(register FILE *stream, unsigned char *buf)
{
#ifdef __STDIO_GETC_MACRO
stream->bufgetc =
#endif
#ifdef __STDIO_PUTC_MACRO
stream->bufputc =
#endif
stream->bufpos = stream->bufread = stream->bufend = stream->bufstart = buf;
}
libc_hidden_proto(mbrtowc)
UNLOCKED(wint_t,fgetwc,(register FILE *stream),(stream))
{
wint_t wi;
wchar_t wc[1];
int n;
size_t r;
unsigned char c[1];
unsigned char sbuf[1];
wi = WEOF; /* Prepare for failure. */
if (stream->modeflags & __FLAG_NARROW) {
stream->modeflags |= __FLAG_ERROR;
__set_errno(EBADF);
goto DONE;
}
stream->modeflags |= __FLAG_WIDE;
if (stream->modeflags & __MASK_UNGOT) {/* Any ungetwc()s? */
assert(stream->modeflags & __FLAG_READING);
/* assert( (stream->modeflags & (__FLAG_READING|__FLAG_ERROR)) */
/* == __FLAG_READING); */
if ((((stream->modeflags & __MASK_UNGOT) > 1) || stream->ungot[1])) {
stream->ungot_width[0] = 0; /* Application ungot... */
} else {
stream->ungot_width[0] = stream->ungot_width[1]; /* scanf ungot */
}
wi = stream->ungot[(--stream->modeflags) & __MASK_UNGOT];
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 = stream->bufread - stream->bufpos) == 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_fread(c, (size_t) 1, stream) > 0) {
assert(stream->bufpos == stream->bufstart + 1);
*--stream->bufpos = *c; /* Insert byte into buffer. */
goto LOOP;
}
if (!__FERROR(stream)) { /* EOF with no error. */
if (!stream->state.mask) { /* No partially complete 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);
}
return wi;
}
libc_hidden_def(fgetwc_unlocked)
strong_alias(fgetwc_unlocked,getwc_unlocked)
strong_alias(fgetwc,getwc)
#endif
/**********************************************************************/
#ifdef L_getwchar
UNLOCKED_STREAM(wint_t,getwchar,(void),(),stdin)
{
register FILE *stream = stdin; /* This helps bcc optimize. */
return fgetwc_unlocked(stream);
}
#endif
/**********************************************************************/
#ifdef L_fgetws
UNLOCKED(wchar_t *,fgetws,(wchar_t *__restrict ws, int n,
FILE *__restrict stream),(ws, n, stream))
{
register wchar_t *p = ws;
wint_t wi;
while ((n > 1)
&& ((wi = fgetwc_unlocked(stream)) != WEOF)
&& ((*p++ = wi) != '\n')
) {
--n;
}
if (p == ws) {
/* TODO -- should we set errno? */
/* if (n <= 0) { */
/* errno = EINVAL; */
/* } */
return NULL;
}
*p = 0;
return ws;
}
#endif
/**********************************************************************/
#ifdef L_fputwc
/* libc_hidden_proto(wcrtomb) */
UNLOCKED(wint_t,fputwc,(wchar_t wc, FILE *stream),(wc, stream))
{
#if 1
return _wstdio_fwrite(&wc, 1, stream) ? wc : WEOF;
#else
size_t n;
char buf[MB_LEN_MAX];
if (stream->modeflags & __FLAG_NARROW) {
stream->modeflags |= __FLAG_ERROR;
__set_errno(EBADF);
return WEOF;
}
stream->modeflags |= __FLAG_WIDE;
return (((n = wcrtomb(buf, wc, &stream->state)) != ((size_t)-1)) /* !EILSEQ */
&& (_stdio_fwrite(buf, n, stream) == n))/* and wrote everything. */
? wc : WEOF;
#endif
}
libc_hidden_def(fputwc_unlocked)
strong_alias(fputwc_unlocked,putwc_unlocked)
strong_alias(fputwc,putwc)
#endif
/**********************************************************************/
#ifdef L_putwchar
UNLOCKED_STREAM(wint_t,putwchar,(wchar_t wc),(wc),stdout)
{
register FILE *stream = stdout; /* This helps bcc optimize. */
return fputwc_unlocked(wc, stream);
}
#endif
/**********************************************************************/
#ifdef L_fputws
libc_hidden_proto(wcslen)
/* libc_hidden_proto(wcsrtombs) */
UNLOCKED(int,fputws,(const wchar_t *__restrict ws,
register FILE *__restrict stream),(ws, stream))
{
#if 1
size_t n = wcslen(ws);
return (_wstdio_fwrite(ws, n, stream) == n) ? 0 : -1;
#else
size_t n;
char buf[64];
if (stream->modeflags & __FLAG_NARROW) {
stream->modeflags |= __FLAG_ERROR;
__set_errno(EBADF);
return -1;
}
stream->modeflags |= __FLAG_WIDE;
while ((n = wcsrtombs(buf, &ws, sizeof(buf), &stream->state)) != 0) {
/* Wasn't an empty wide string. */
if ((n == ((size_t) -1))/* Encoding error! */
|| (_stdio_fwrite(buf, n, stream) != n)/* Didn't write everything. */
) {
return -1;
}
if (!ws) { /* Done? */
break;
}
}
return 1;
#endif
}
#endif
/**********************************************************************/
#ifdef L_ungetwc
/*
* Note: This is the application-callable ungetwc. If wscanf calls this, it
* should also set stream->ungot[1] to 0 if this is the only ungot, as well
* as reset stream->ungot_width[1] for use by _stdio_adjpos().
*/
/* Reentrant. */
libc_hidden_proto(fflush_unlocked)
wint_t ungetwc(wint_t c, register FILE *stream)
{
__STDIO_THREADLOCK(stream);
__stdio_validate_FILE(stream); /* debugging only */
if (stream->modeflags & __FLAG_NARROW) {
stream->modeflags |= __FLAG_ERROR;
c = WEOF;
goto DONE;
}
stream->modeflags |= __FLAG_WIDE;
/* If can't read or c == WEOF or ungot slots already filled, then fail. */
if ((stream->modeflags
& (__MASK_UNGOT2|__FLAG_WRITEONLY
#ifndef __UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION__
|__FLAG_WRITING /* Note: technically no, but yes in spirit */
#endif /* __UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION__ */
))
|| ((stream->modeflags & __MASK_UNGOT1) && (stream->ungot[1]))
|| (c == WEOF) ) {
c = WEOF;
goto DONE;;
}
/* ungot_width */
#ifdef __STDIO_BUFFERS
#ifdef __UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION__
if (stream->modeflags & __FLAG_WRITING) {
fflush_unlocked(stream); /* Commit any write-buffered chars. */
}
#endif /* __UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION__ */
#endif /* __STDIO_BUFFERS */
/* Clear EOF and WRITING flags, and set READING FLAG */
stream->modeflags &= ~(__FLAG_EOF|__FLAG_WRITING);
#ifdef __UCLIBC_MJN3_ONLY__
#warning CONSIDER: Is setting the reading flag after an ungetwc necessary?
#endif /* __UCLIBC_MJN3_ONLY__ */
stream->modeflags |= __FLAG_READING;
stream->ungot[1] = 1; /* Flag as app ungetc call; wscanf fixes up. */
stream->ungot[(stream->modeflags++) & __MASK_UNGOT] = c;
__stdio_validate_FILE(stream); /* debugging only */
DONE:
__STDIO_THREADUNLOCK(stream);
return c;
}
#endif
/**********************************************************************/
|