size_t __stdio_READ(register FILE *stream,
unsigned char *buf, size_t bufsize)
{
ssize_t rv = 0;
__STDIO_STREAM_VALIDATE(stream);
assert(stream->__filedes >= -1);
assert(__STDIO_STREAM_IS_READING(stream));
assert(!__STDIO_STREAM_BUFFER_RAVAIL(stream)); /* Buffer must be empty. */
assert(!(stream->__modeflags & __FLAG_UNGOT));
assert(bufsize);
if (!__FEOF_UNLOCKED(stream)) {
if (bufsize > SSIZE_MAX) {
bufsize = SSIZE_MAX;
}
#ifdef __UCLIBC_MJN3_ONLY__
#warning EINTR?
#endif
/* RETRY: */
if ((rv = __READ(stream, buf, bufsize)) <= 0) {
if (rv == 0) {
__STDIO_STREAM_SET_EOF(stream);
} else {
/* if (errno == EINTR) goto RETRY; */
__STDIO_STREAM_SET_ERROR(stream);
rv = 0;
}
#ifdef __UCLIBC_MJN3_ONLY__
#warning TODO: Make custom stream read return check optional.
#endif
#ifdef __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__
} else {
assert(rv <= bufsize);
if (rv > bufsize) { /* Read more than bufsize! */
abort();
}
#endif
}
}
return rv;
}
size_t attribute_hidden __stdio_WRITE(register FILE *stream,
register const unsigned char *buf, size_t bufsize)
{
size_t todo;
ssize_t rv, stodo;
__STDIO_STREAM_VALIDATE(stream);
assert(stream->__filedes >= -1);
assert(__STDIO_STREAM_IS_WRITING(stream));
assert(!__STDIO_STREAM_BUFFER_WUSED(stream)); /* Buffer must be empty. */
todo = bufsize;
do {
if (todo == 0) { /* Done? */
__STDIO_STREAM_VALIDATE(stream);
return bufsize;
}
stodo = (todo <= SSIZE_MAX) ? todo : SSIZE_MAX;
if ((rv = __WRITE(stream, (char *) buf, stodo)) >= 0) {
#ifdef __UCLIBC_MJN3_ONLY__
#warning TODO: Make custom stream write return check optional.
#endif
#ifdef __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__
assert(rv <= stodo);
if (rv > stodo) { /* Wrote more than stodo! */
/* abort(); */
}
#endif
todo -= rv;
buf += rv;
} else
#ifdef __UCLIBC_MJN3_ONLY__
#warning EINTR?
#endif
/* if (errno != EINTR) */
{
__STDIO_STREAM_SET_ERROR(stream);
#ifdef __STDIO_BUFFERS
if ((stodo = __STDIO_STREAM_BUFFER_SIZE(stream)) != 0) {
unsigned char *s;
if (stodo > todo) {
stodo = todo;
}
s = stream->__bufstart;
do {
if (((*s = *buf) == '\n')
&& __STDIO_STREAM_IS_LBF(stream)
) {
break;
}
++s;
++buf;
} while (--stodo);
stream->__bufpos = s;
todo -= (s - stream->__bufstart);
}
#endif /* __STDIO_BUFFERS */
__STDIO_STREAM_VALIDATE(stream);
return bufsize - todo;
}
} while (1);
}
int fflush_unlocked(register FILE *stream)
{
#ifdef __STDIO_BUFFERS
int retval = 0;
#ifdef __UCLIBC_MJN3_ONLY__
#warning REMINDER: should probably define a modeflags type
#endif
unsigned short bufmask = __FLAG_LBF;
#ifndef NDEBUG
if ((stream != NULL) && (stream != (FILE *) &_stdio_openlist)) {
__STDIO_STREAM_VALIDATE(stream); /* debugging only */
}
#endif
if (stream == (FILE *) &_stdio_openlist) { /* Flush all lbf streams. */
stream = NULL;
bufmask = 0;
}
if (!stream) { /* Flush all (lbf) writing streams. */
__STDIO_OPENLIST_INC_USE;
__STDIO_THREADLOCK_OPENLIST_ADD;
stream = _stdio_openlist;
__STDIO_THREADUNLOCK_OPENLIST_ADD;
while(stream) {
/* We only care about currently writing streams and do not want to
* block trying to obtain mutexes on non-writing streams. */
#warning fix for nonatomic
#warning unnecessary check if no threads
if (__STDIO_STREAM_IS_WRITING(stream)) { /* ONLY IF ATOMIC!!! */
__MY_STDIO_THREADLOCK(stream);
/* Need to check again once we have the lock. */
if (!(((stream->__modeflags | bufmask)
^ (__FLAG_WRITING|__FLAG_LBF)
) & (__FLAG_WRITING|__MASK_BUFMODE))
) {
if (!__STDIO_COMMIT_WRITE_BUFFER(stream)) {
__STDIO_STREAM_DISABLE_PUTC(stream);
__STDIO_STREAM_CLEAR_WRITING(stream);
} else {
retval = EOF;
}
}
__MY_STDIO_THREADUNLOCK(stream);
}
stream = stream->__nextopen;
}
__STDIO_OPENLIST_DEC_USE;
} else if (__STDIO_STREAM_IS_WRITING(stream)) {
if (!__STDIO_COMMIT_WRITE_BUFFER(stream)) {
__STDIO_STREAM_DISABLE_PUTC(stream);
__STDIO_STREAM_CLEAR_WRITING(stream);
} else {
retval = EOF;
}
}
#if 0
else if (stream->__modeflags & (__MASK_READING|__FLAG_READONLY)) {
/* ANSI/ISO says behavior in this case is undefined but also says you
* shouldn't flush a stream you were reading from. As usual, glibc
* caters to broken programs and simply ignores this. */
__UNDEFINED_OR_NONPORTABLE;
__STDIO_STREAM_SET_ERROR(stream);
__set_errno(EBADF);
retval = EOF;
}
#endif
#ifndef NDEBUG
if ((stream != NULL) && (stream != (FILE *) &_stdio_openlist)) {
__STDIO_STREAM_VALIDATE(stream); /* debugging only */
}
#endif
return retval;
#else /* __STDIO_BUFFERS --------------------------------------- */
#ifndef NDEBUG
if ((stream != NULL)
#ifdef __STDIO_HAS_OPENLIST
&& (stream != (FILE *) &_stdio_openlist)
#endif
) {
__STDIO_STREAM_VALIDATE(stream); /* debugging only */
}
#endif
#if 0
if (stream && (stream->__modeflags & (__MASK_READING|__FLAG_READONLY))) {
/* ANSI/ISO says behavior in this case is undefined but also says you
* shouldn't flush a stream you were reading from. As usual, glibc
* caters to broken programs and simply ignores this. */
__UNDEFINED_OR_NONPORTABLE;
__STDIO_STREAM_SET_ERROR(stream);
__set_errno(EBADF);
return EOF;
}
#endif
return 0;
#endif /* __STDIO_BUFFERS */
}
