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gambas-source-code/main/gbx/gbx_stream.c
Benoît Minisini 405f8f89fe [INTERPRETER] 
* OPT: Some optimizations again in memory allocator, object releasing 
  routine, arithmetic operators, class variable reader, line-by-line stream
  reader, class symbol sort routine.
* BUG: Using constant strings inside variant, like database drivers, works
  correctly again and does not crash the interpreter anymore.


git-svn-id: svn://localhost/gambas/trunk@2996 867c0c6c-44f3-4631-809d-bfa615b0a4ec
2010-06-08 23:08:04 +00:00

1263 lines
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/***************************************************************************
gbx_stream.c
(c) 2000-2009 Benoît Minisini <gambas@users.sourceforge.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
***************************************************************************/
#define __GBX_STREAM_C
#include "gb_common.h"
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <sys/ioctl.h>
#include "gb_common_buffer.h"
#include "gb_common_swap.h"
#include "gb_common_check.h"
#include "gb_error.h"
#include "gbx_value.h"
#include "gb_limit.h"
#include "gbx_exec.h"
#include "gbx_project.h"
#include "gb_file.h"
#include "gambas.h"
#include "gbx_regexp.h"
#include "gbx_api.h"
#include "gbx_string.h"
#include "gbx_watch.h"
#include "gbx_stream.h"
int STREAM_eff_read;
#if DEBUG_STREAM
static unsigned char _tag = 0;
static int _nopen = 0;
#endif
#if DEBUG_STREAM
void STREAM_exit(void)
{
if (_nopen)
fprintf(stderr, "WARNING: %d streams yet opened\n", _nopen);
}
#endif
#define wait_for_fd_ready_to_read(_fd) WATCH_process(_fd, -1)
bool STREAM_in_archive(const char *path)
{
ARCHIVE *arch;
if (FILE_is_relative(path))
{
ARCHIVE_get_current(&arch);
if (arch->name || EXEC_arch) // || !FILE_exist_real(path)) - Why that test ?
return TRUE;
}
return FALSE;
}
static int STREAM_get_readable(STREAM *stream, int *len)
{
int fd;
off_t off;
off_t end;
fd = STREAM_handle(stream);
//_IOCTL:
#ifdef FIONREAD
if (!stream->common.no_fionread)
{
if (ioctl(fd, FIONREAD, len) >= 0)
return 0;
stream->common.no_fionread = TRUE;
}
#endif
//_LSEEK:
if (!stream->common.no_lseek)
{
off = lseek(fd, 0, SEEK_CUR);
if (off >= 0)
{
end = lseek(fd, 0, SEEK_END);
if (end >= 0)
{
*len = (int)(end - off);
off = lseek(fd, off, SEEK_SET);
if (off >= 0)
return 0;
}
}
stream->common.no_lseek = TRUE;
}
//fprintf(stderr, "STREAM_get_readable: lseek: %d\n", *len);
return (-1);
}
static int default_eof(STREAM *stream)
{
int fd;
int ilen;
fd = STREAM_handle(stream);
if (fd < 0)
return TRUE;
if (STREAM_is_blocking(stream) && !stream->common.available_now)
wait_for_fd_ready_to_read(STREAM_handle(stream));
if (STREAM_get_readable(stream, &ilen))
return TRUE;
return (ilen == 0);
}
// STREAM_open *MUST* initialize completely the stream structure
void STREAM_open(STREAM *stream, const char *path, int mode)
{
if (mode & ST_PIPE)
{
stream->type = &STREAM_pipe;
}
else if (mode & ST_MEMORY)
{
stream->type = &STREAM_memory;
}
else
{
if (FILE_is_relative(path))
{
ARCHIVE *arch = NULL;
if (strncmp(path, "../", 3))
ARCHIVE_get_current(&arch);
else if (!EXEC_arch)
path += 3;
if ((arch && arch->name) || EXEC_arch) // || !FILE_exist_real(path)) - Why that test ?
{
stream->type = &STREAM_arch;
goto _OPEN;
}
if ((mode & ST_ACCESS) != ST_READ || mode & ST_PIPE)
THROW(E_ACCESS);
}
if (mode & ST_DIRECT)
stream->type = &STREAM_direct;
else
stream->type = &STREAM_buffer;
}
_OPEN:
stream->common.mode = mode;
stream->common.swap = FALSE;
stream->common.eol = 0;
stream->common.eof = FALSE;
stream->common.buffer = NULL;
stream->common.buffer_pos = 0;
stream->common.buffer_len = 0;
stream->common.no_fionread = FALSE;
stream->common.no_lseek = FALSE;
stream->common.standard = FALSE;
stream->common.blocking = TRUE;
stream->common.available_now = FALSE;
if ((*(stream->type->open))(stream, path, mode, NULL))
{
stream->type = NULL;
THROW_SYSTEM(errno, path);
}
#if DEBUG_STREAM
_tag++;
stream->common.tag = _tag;
_nopen++;
fprintf(stderr, "Open %p [%d] (%d)\n", stream, _tag, _nopen);
#endif
}
void STREAM_release(STREAM *stream)
{
if (stream->common.buffer)
{
#if DEBUG_STREAM
fprintf(stderr, "Stream %p [%d]: Free buffer\n", stream, stream->common.tag);
#endif
FREE(&stream->common.buffer, "STREAM_close");
stream->common.buffer_pos = 0;
stream->common.buffer_len = 0;
}
}
void STREAM_close(STREAM *stream)
{
int fd;
STREAM_release(stream);
if (!stream->type)
return;
fd = STREAM_handle(stream);
if (fd >= 0)
GB_Watch(fd, GB_WATCH_NONE, NULL, 0);
if (stream->common.standard || !(*(stream->type->close))(stream))
stream->type = NULL;
#if DEBUG_STREAM
_nopen--;
fprintf(stderr, "Close %p [%d] (%d)\n", stream, stream->common.tag, _nopen);
#endif
}
void STREAM_flush(STREAM *stream)
{
if (!stream->type)
THROW(E_CLOSED);
(*(stream->type->flush))(stream);
}
static void read_buffer(STREAM *stream, void **addr, int *len)
{
int l = stream->common.buffer_len - stream->common.buffer_pos;
if (l > *len)
l = *len;
if (l > 0)
{
memcpy(*addr, stream->common.buffer + stream->common.buffer_pos, l);
*addr = (char *)*addr + l;
*len -= l;
STREAM_eff_read += l;
stream->common.buffer_pos += l;
}
}
void STREAM_read(STREAM *stream, void *addr, int len)
{
STREAM_eff_read = 0;
if (!stream->type)
THROW(E_CLOSED);
if (stream->common.buffer)
read_buffer(stream, &addr, &len);
while ((*(stream->type->read))(stream, addr, len))
{
switch(errno)
{
case EINTR:
break;
case 0:
case EAGAIN:
THROW(E_EOF);
case EIO:
THROW(E_READ);
default:
THROW_SYSTEM(errno, NULL);
}
}
}
char STREAM_getchar(STREAM *stream)
{
char c = 0;
bool ret;
if (!stream->type)
THROW(E_CLOSED);
if (stream->common.buffer && stream->common.buffer_pos < stream->common.buffer_len)
return stream->common.buffer[stream->common.buffer_pos++];
for(;;)
{
if (stream->type->getchar)
ret = (*(stream->type->getchar))(stream, &c);
else
ret = (*(stream->type->read))(stream, &c, 1);
if (!ret)
break;
switch(errno)
{
case EINTR:
continue;
case 0:
case EAGAIN:
THROW(E_EOF);
case EIO:
THROW(E_READ);
default:
THROW_SYSTEM(errno, NULL);
}
}
return c;
}
int STREAM_read_max(STREAM *stream, void *addr, int len)
{
bool err;
int flags, handle;
int save_errno;
if (!stream->type)
THROW(E_CLOSED);
STREAM_eff_read = 0;
if (stream->common.buffer)
read_buffer(stream, &addr, &len);
if (len > 0)
{
for(;;)
{
if (stream->common.available_now)
{
err = (*(stream->type->read))(stream, addr, len);
}
else
{
handle = STREAM_handle(stream);
flags = fcntl(handle, F_GETFL);
if ((flags & O_NONBLOCK) == 0)
{
wait_for_fd_ready_to_read(handle);
fcntl(handle, F_SETFL, flags | O_NONBLOCK);
}
errno = 0;
err = (*(stream->type->read))(stream, addr, len);
save_errno = errno;
if ((flags & O_NONBLOCK) == 0)
fcntl(handle, F_SETFL, flags);
errno = save_errno;
}
if (!err)
break;
switch(errno)
{
case EINTR:
continue;
case 0:
case EAGAIN:
return STREAM_eff_read;
case EIO:
return -1; //THROW(E_READ);
default:
THROW_SYSTEM(errno, NULL);
}
}
}
return STREAM_eff_read;
}
void STREAM_write(STREAM *stream, void *addr, int len)
{
if (!stream->type)
THROW(E_CLOSED);
while ((*(stream->type->write))(stream, addr, len))
{
switch(errno)
{
case EINTR:
break;
case EIO:
THROW(E_WRITE);
default:
THROW_SYSTEM(errno, NULL);
}
}
}
void STREAM_write_eol(STREAM *stream)
{
if (!stream->type)
THROW(E_CLOSED);
switch(stream->common.eol)
{
case ST_EOL_UNIX: STREAM_write(stream, "\n", 1); break;
case ST_EOL_WINDOWS: STREAM_write(stream, "\r\n", 2); break;
case ST_EOL_MAC: STREAM_write(stream, "\r", 1); break;
}
}
int64_t STREAM_tell(STREAM *stream)
{
int64_t pos;
if (!stream->type)
THROW(E_CLOSED);
if (stream->type->tell(stream, &pos))
/*THROW(E_SEEK, ERROR_get());*/
THROW_SYSTEM(errno, NULL);
return pos;
}
void STREAM_seek(STREAM *stream, int64_t pos, int whence)
{
if (!stream->type)
THROW(E_CLOSED);
if (stream->type->seek(stream, pos, whence))
{
switch(errno)
{
case EINVAL:
THROW(E_ARG);
default:
THROW_SYSTEM(errno, NULL);
}
}
}
static void fill_buffer(STREAM *stream, char *addr)
{
bool err;
int flags, fd;
STREAM_eff_read = 0;
fd = STREAM_handle(stream);
for(;;)
{
if (stream->common.available_now)
err = (*(stream->type->read))(stream, addr, STREAM_BUFFER_SIZE);
else
{
wait_for_fd_ready_to_read(fd);
flags = fcntl(fd, F_GETFL);
if ((flags & O_NONBLOCK) == 0)
fcntl(fd, F_SETFL, flags | O_NONBLOCK);
err = (*(stream->type->read))(stream, addr, STREAM_BUFFER_SIZE);
if ((flags & O_NONBLOCK) == 0)
fcntl(fd, F_SETFL, flags);
}
if (!err)
break;
switch(errno)
{
case EINTR:
continue;
case 0:
case EAGAIN:
case EINPROGRESS:
return;
case EIO:
return; //THROW(E_READ);
default:
THROW_SYSTEM(errno, NULL);
}
}
}
static char *input(STREAM *stream, bool line)
{
int len = 0;
int start;
unsigned char c, lc = 0;
void *test;
bool eol;
char *buffer;
int buffer_len;
int buffer_pos;
char *addr;
addr = NULL;
stream->common.eof = FALSE;
if (!line)
test = &&__TEST_INPUT;
else
{
switch(stream->common.eol)
{
case 1: test = &&__TEST_WINDOWS; break;
case 2: test = &&__TEST_MAC; break;
default: test = &&__TEST_UNIX; break;
}
}
if (!STREAM_is_blocking(stream) && STREAM_eof(stream))
{
//printf("EOF!\n"); fflush(stdout);
THROW(E_EOF);
}
buffer = stream->common.buffer;
buffer_len = stream->common.buffer_len;
buffer_pos = stream->common.buffer_pos;
if (!buffer)
{
#if DEBUG_STREAM
fprintf(stderr, "Stream %p [%d]: Alloc buffer\n", stream, stream->common.tag);
#endif
ALLOC(&buffer, STREAM_BUFFER_SIZE, "input");
buffer_pos = 0;
buffer_len = 0;
}
/*eof_func = stream->type->eof;
if (!eof_func)
eof_func = default_eof;*/
start = buffer_pos;
for(;;)
{
if (buffer_pos == buffer_len)
{
if (len)
{
//add_string(addr, &len_str, stream->common.buffer + start, len);
STRING_add(&addr, buffer + start, len);
len = 0;
}
stream->common.buffer = buffer;
stream->common.buffer_pos = buffer_pos;
stream->common.buffer_len = buffer_len;
//printf("fill_buffer: (is_file = %d)\n", stream->common.is_file); fflush(stdout);
fill_buffer(stream, buffer);
//STREAM_read_max(stream, buffer, STREAM_BUFFER_SIZE);
buffer_pos = 0;
buffer_len = STREAM_eff_read;
#if 0
printf("-> %d: ", buffer_len);
{
int i;
for (i = 0; i < buffer_len; i++)
{
printf("%02X ", buffer[i]);
}
putchar('\n');
}
#endif
if (!buffer_len)
{
//if (stream->common.available_now)
//{
stream->common.eof = TRUE;
break;
//}
}
start = 0;
}
c = buffer[buffer_pos++]; //STREAM_getchar(stream);
goto *test;
__TEST_INPUT:
eol = (c <= ' ');
goto __TEST_OK;
__TEST_UNIX:
eol = (c == '\n');
if (lc == '\r')
len--;
lc = c;
goto __TEST_OK;
__TEST_MAC:
eol = (c == '\r');
goto __TEST_OK;
__TEST_WINDOWS:
eol = (lc == '\r') && (c == '\n');
if (eol)
len--;
lc = c;
goto __TEST_OK;
__TEST_OK:
if (eol)
break;
len++;
}
if (len > 0)
//add_string(addr, &len_str, stream->common.buffer + start, len);
STRING_add(&addr, buffer + start, len);
STRING_extend_end(&addr);
stream->common.buffer = buffer;
stream->common.buffer_pos = buffer_pos;
stream->common.buffer_len = buffer_len;
return addr;
}
char *STREAM_line_input(STREAM *stream)
{
return input(stream, TRUE);
}
char *STREAM_input(STREAM *stream)
{
return input(stream, FALSE);
}
void STREAM_read_type(STREAM *stream, TYPE type, VALUE *value, int len)
{
union
{
unsigned char _byte;
short _short;
int _int;
float _single;
unsigned char _data[4];
}
buffer;
if (type == T_VARIANT)
{
STREAM_read(stream, &buffer._byte, 1);
type = buffer._byte;
}
value->type = type;
switch (type)
{
case T_BOOLEAN:
STREAM_read(stream, &buffer._byte, 1);
value->_integer.value = (buffer._byte != 0) ? (-1) : 0;
break;
case T_BYTE:
STREAM_read(stream, &buffer._byte, 1);
value->_integer.value = buffer._byte;
break;
case T_SHORT:
STREAM_read(stream, &buffer._short, sizeof(short));
if (stream->common.swap)
SWAP_short(&buffer._short);
value->_integer.value = buffer._short;
break;
case T_INTEGER:
STREAM_read(stream, &value->_integer.value, sizeof(int));
if (stream->common.swap)
SWAP_int(&value->_integer.value);
break;
case T_LONG:
STREAM_read(stream, &value->_long.value, sizeof(int64_t));
if (stream->common.swap)
SWAP_int64(&value->_long.value);
break;
case T_SINGLE:
STREAM_read(stream, &buffer._single, sizeof(float));
if (stream->common.swap)
SWAP_float(&buffer._single);
value->_float.value = buffer._single;
break;
case T_FLOAT:
STREAM_read(stream, &value->_float.value, sizeof(double));
if (stream->common.swap)
SWAP_double(&value->_float.value);
break;
case T_DATE:
STREAM_read(stream, &value->_date.date, sizeof(int));
STREAM_read(stream, &value->_date.time, sizeof(int));
if (stream->common.swap)
{
SWAP_int(&value->_date.date);
SWAP_int(&value->_date.time);
}
break;
case T_CSTRING:
value->type = T_STRING;
// continue
case T_STRING:
if (len == 0)
{
if (stream->type == &STREAM_memory)
{
size_t slen;
if (CHECK_strlen(stream->memory.addr + stream->memory.pos, &slen))
THROW(E_READ);
len = (int)slen;
}
else
{
STREAM_read(stream, buffer._data, 1);
switch (buffer._data[0] >> 6)
{
case 0:
case 1:
len = buffer._data[0];
break;
case 2:
STREAM_read(stream, &buffer._data[1], 1);
buffer._data[0] &= 0x3F;
if (!EXEC_big_endian)
SWAP_short(&buffer._short);
len = buffer._short;
break;
case 3:
STREAM_read(stream, &buffer._data[1], 3);
buffer._data[0] &= 0x3F;
if (!EXEC_big_endian)
SWAP_int(&buffer._int);
len = buffer._int;
break;
}
}
}
if (len > 0)
{
STRING_new_temp_value(value, NULL, labs(len));
STREAM_read(stream, value->_string.addr, len);
}
else
{
len = (-len);
value->type = T_STRING;
value->_string.addr = STRING_new(NULL, len);
value->_string.start = 0;
value->_string.len = len;
STREAM_read_max(stream, value->_string.addr, len);
if (STREAM_eff_read == 0)
{
value->type = T_NULL;
STRING_free(&value->_string.addr);
}
else
{
if (STREAM_eff_read < len)
{
STRING_extend(&value->_string.addr, STREAM_eff_read);
value->_string.len = STREAM_eff_read;
}
STRING_extend_end(&value->_string.addr);
}
}
break;
default:
THROW(E_TYPE, "Standard type", TYPE_get_name(type));
}
}
void STREAM_write_type(STREAM *stream, TYPE type, VALUE *value, int len)
{
union
{
unsigned char _byte;
short _short;
int _int;
int64_t _long;
float _single;
double _float;
unsigned char _data[8];
}
buffer;
bool write_zero;
if (type == T_VARIANT)
{
VARIANT_undo(value);
type = value->type;
buffer._byte = (unsigned char)type;
STREAM_write(stream, &buffer._byte, 1);
}
//value->type = type;
switch (type)
{
case T_BOOLEAN:
buffer._byte = value->_integer.value ? 0xFF : 0;
STREAM_write(stream, &buffer._byte, 1);
break;
case T_BYTE:
buffer._byte = (unsigned char)value->_integer.value;
STREAM_write(stream, &buffer._byte, 1);
break;
case T_SHORT:
buffer._short = (short)value->_integer.value;
if (stream->common.swap)
SWAP_short(&buffer._short);
STREAM_write(stream, &buffer._short, sizeof(short));
break;
case T_INTEGER:
buffer._int = value->_integer.value;
if (stream->common.swap)
SWAP_int(&buffer._int);
STREAM_write(stream, &buffer._int, sizeof(int));
break;
case T_LONG:
buffer._long = value->_long.value;
if (stream->common.swap)
SWAP_int64(&buffer._long);
STREAM_write(stream, &buffer._long, sizeof(int64_t));
break;
case T_SINGLE:
buffer._single = (float)value->_float.value;
if (stream->common.swap)
SWAP_float(&buffer._single);
STREAM_write(stream, &buffer._single, sizeof(float));
break;
case T_FLOAT:
buffer._float = value->_float.value;
if (stream->common.swap)
SWAP_double(&buffer._float);
STREAM_write(stream, &buffer._float, sizeof(double));
break;
case T_DATE:
buffer._int = value->_date.date;
if (stream->common.swap)
SWAP_int(&buffer._int);
STREAM_write(stream, &buffer._int, sizeof(int));
buffer._int = value->_date.time;
if (stream->common.swap)
SWAP_int(&buffer._int);
STREAM_write(stream, &buffer._int, sizeof(int));
break;
case T_STRING:
case T_CSTRING:
write_zero = (stream->type == &STREAM_memory) && len == 0;
if (len == 0)
{
len = value->_string.len;
if (stream->type != &STREAM_memory)
{
if (len < 0x80)
{
buffer._byte = (unsigned char)len;
STREAM_write(stream, &buffer._byte, 1);
}
else if (len < 0x4000)
{
buffer._short = (short)len | 0x8000;
if (!EXEC_big_endian)
SWAP_short(&buffer._short);
STREAM_write(stream, &buffer._short, sizeof(short));
}
else
{
buffer._int = len | 0xC0000000;
if (!EXEC_big_endian)
SWAP_int(&buffer._int);
STREAM_write(stream, &buffer._int, sizeof(int));
}
}
}
STREAM_write(stream, value->_string.addr + value->_string.start, Min(len, value->_string.len));
buffer._byte = 0;
while (len > value->_string.len)
{
STREAM_write(stream, &buffer._byte, 1);
len--;
}
if (write_zero)
STREAM_write(stream, &buffer._byte, 1);
break;
case T_NULL:
buffer._byte = 0;
STREAM_write(stream, &buffer._byte, 1);
break;
/*case T_OBJECT:
class = OBJECT_class(value->_object.object);
if (class == CLASS_Array || CLASS_inherits(class, CLASS_Array))
{
CARRAY_stream_write((CARRAY *)value->_object.object, stream);
break;
}
else if (class == CLASS_Collection || CLASS_inherits(class, CLASS_Collection))
{
CCOLLECTION_stream_write((CCOLLECTION *)value->_object.object, stream);
break;
}*/
default:
THROW(E_TYPE, "Standard type", TYPE_get_name(type));
}
}
void STREAM_load(const char *path, char **buffer, int *rlen)
{
STREAM stream;
int64_t len;
STREAM_open(&stream, path, ST_READ);
STREAM_lof(&stream, &len);
if (len >> 31)
THROW(E_MEMORY);
*rlen = len;
ALLOC(buffer, *rlen, "STREAM_load");
STREAM_read(&stream, *buffer, *rlen);
STREAM_close(&stream);
}
bool STREAM_map(const char *path, char **paddr, int *plen)
{
STREAM stream;
int fd;
struct stat info;
void *addr;
size_t len;
bool ret = TRUE;
STREAM_open(&stream, path, ST_READ + ST_DIRECT);
if (stream.type == &STREAM_arch)
{
*paddr = (char *)stream.arch.arch->arch->addr + stream.arch.start;
*plen = stream.arch.size;
ret = FALSE;
goto __RETURN;
}
fd = STREAM_handle(&stream);
if (fd < 0)
goto __RETURN;
if (fstat(fd, &info) < 0)
goto __RETURN;
len = info.st_size;
addr = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
if (addr == MAP_FAILED)
goto __RETURN;
*paddr = addr;
*plen = len;
ret = FALSE;
__RETURN:
STREAM_close(&stream);
return ret;
}
void STREAM_unmap(char *addr, int len)
{
if (addr && len > 0 && ARCHIVE_check_addr(addr))
{
munmap(addr, len);
}
}
int STREAM_handle(STREAM *stream)
{
if (!stream->type)
THROW(E_CLOSED);
if (stream->type->handle)
return (*stream->type->handle)(stream);
else
return (-1);
}
void STREAM_lock(STREAM *stream)
{
int64_t pos;
int fd;
if (!stream->type)
THROW(E_CLOSED);
fd = STREAM_handle(stream);
if (fd < 0)
THROW(E_LOCK);
pos = lseek(fd, 0, SEEK_CUR);
if (pos < 0)
goto __ERROR;
if (lseek(fd, 0, SEEK_SET) < 0)
goto __ERROR;
#ifdef F_TLOCK
if (lockf(fd, F_TLOCK, 0))
{
if (errno == EAGAIN)
THROW(E_LOCK);
else
goto __ERROR;
}
#else
fprintf(stderr, "locking is not implemented\n");
#endif
if (lseek(fd, pos, SEEK_SET) < 0)
goto __ERROR;
return;
__ERROR:
THROW_SYSTEM(errno, NULL);
}
void STREAM_lof(STREAM *stream, int64_t *len)
{
int fd;
int ilen;
if (!stream->type)
THROW(E_CLOSED);
if (stream->type->lof)
{
if (!(*(stream->type->lof))(stream, len))
return;
}
fd = STREAM_handle(stream);
if ((fd >= 0) && (STREAM_get_readable(stream, &ilen) == 0))
*len = ilen;
if (stream->common.buffer)
*len += stream->common.buffer_len - stream->common.buffer_pos;
}
bool STREAM_eof(STREAM *stream)
{
if (!stream->type)
THROW(E_CLOSED);
if (stream->common.buffer && stream->common.buffer_pos < stream->common.buffer_len)
return FALSE;
if (stream->type->eof)
return ((*(stream->type->eof))(stream));
else
return default_eof(stream);
}
int STREAM_read_direct(int fd, char *buffer, int len)
{
ssize_t eff_read;
ssize_t len_read;
while (len > 0)
{
len_read = Min(len, MAX_IO);
eff_read = read(fd, buffer, len_read);
if (eff_read > 0)
{
STREAM_eff_read += eff_read;
len -= eff_read;
buffer += eff_read;
}
if (eff_read < len_read)
{
if (eff_read == 0)
errno = 0;
if (eff_read <= 0 && errno != EINTR)
return TRUE;
}
}
return FALSE;
}
int STREAM_write_direct(int fd, char *buffer, int len)
{
ssize_t eff_write;
ssize_t len_write;
while (len > 0)
{
len_write = Min(len, MAX_IO);
eff_write = write(fd, buffer, len_write);
if (eff_write < len_write)
{
if (eff_write <= 0 && errno != EINTR)
return TRUE;
}
len -= eff_write;
buffer += eff_write;
}
return FALSE;
}
void STREAM_blocking(STREAM *stream, bool block)
{
int fd = STREAM_handle(stream);
if (fd < 0)
return;
stream->common.blocking = block;
if (block)
fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_NONBLOCK);
else
fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
}
void STREAM_check_blocking(STREAM *stream)
{
int fd = STREAM_handle(stream);
stream->common.blocking = (fd < 0) ? TRUE : ((fcntl(fd, F_GETFL) & O_NONBLOCK) == 0);
}
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