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gtstream.c
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gtstream.c
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/* gtstream.c: Stream objects
for GlkTerm, curses.h implementation of the Glk API.
Designed by Andrew Plotkin <[email protected]>
http://www.eblong.com/zarf/glk/index.html
*/
#include "gtoption.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "glk.h"
#include "glkterm.h"
#include "gi_blorb.h"
/* This implements pretty much what any Glk implementation needs for
stream stuff. Memory streams, file streams (using stdio functions),
and window streams (which print through window functions in other
files.) A different implementation would change the window stream
stuff, but not file or memory streams. (Unless you're on a
wacky platform like the Mac and want to change stdio to native file
functions.)
*/
static stream_t *gli_streamlist = NULL; /* linked list of all streams */
static stream_t *gli_currentstr = NULL; /* the current output stream */
stream_t *gli_new_stream(int type, int readable, int writable,
glui32 rock)
{
stream_t *str = (stream_t *)malloc(sizeof(stream_t));
if (!str)
return NULL;
str->magicnum = MAGIC_STREAM_NUM;
str->type = type;
str->rock = rock;
str->unicode = FALSE;
str->isbinary = FALSE;
str->win = NULL;
str->file = NULL;
str->lastop = 0;
str->buf = NULL;
str->bufptr = NULL;
str->bufend = NULL;
str->bufeof = NULL;
str->ubuf = NULL;
str->ubufptr = NULL;
str->ubufend = NULL;
str->ubufeof = NULL;
str->buflen = 0;
str->readcount = 0;
str->writecount = 0;
str->readable = readable;
str->writable = writable;
str->prev = NULL;
str->next = gli_streamlist;
gli_streamlist = str;
if (str->next) {
str->next->prev = str;
}
if (gli_register_obj)
str->disprock = (*gli_register_obj)(str, gidisp_Class_Stream);
else
str->disprock.ptr = NULL;
return str;
}
void gli_delete_stream(stream_t *str)
{
stream_t *prev, *next;
if (str == gli_currentstr) {
gli_currentstr = NULL;
}
gli_windows_unechostream(str);
str->magicnum = 0;
switch (str->type) {
case strtype_Window:
/* nothing necessary; the window is already being closed */
break;
case strtype_Memory:
if (gli_unregister_arr) {
/* This could be a char array or a glui32 array. */
char *typedesc = (str->unicode ? "&+#!Iu" : "&+#!Cn");
void *buf = (str->unicode ? (void*)str->ubuf : (void*)str->buf);
(*gli_unregister_arr)(buf, str->buflen, typedesc,
str->arrayrock);
}
break;
case strtype_Resource:
/* nothing necessary; the array belongs to gi_blorb.c. */
break;
case strtype_File:
/* close the FILE */
fclose(str->file);
str->file = NULL;
str->lastop = 0;
break;
}
if (gli_unregister_obj) {
(*gli_unregister_obj)(str, gidisp_Class_Stream, str->disprock);
str->disprock.ptr = NULL;
}
prev = str->prev;
next = str->next;
str->prev = NULL;
str->next = NULL;
if (prev)
prev->next = next;
else
gli_streamlist = next;
if (next)
next->prev = prev;
free(str);
}
void gli_stream_fill_result(stream_t *str, stream_result_t *result)
{
if (!result)
return;
result->readcount = str->readcount;
result->writecount = str->writecount;
}
void glk_stream_close(stream_t *str, stream_result_t *result)
{
if (!str) {
gli_strict_warning("stream_close: invalid ref.");
return;
}
if (str->type == strtype_Window) {
gli_strict_warning("stream_close: cannot close window stream");
return;
}
gli_stream_fill_result(str, result);
gli_delete_stream(str);
}
void gli_streams_close_all()
{
/* This is used only at shutdown time; it closes file streams (the
only ones that need finalization.) */
stream_t *str, *strnext;
str=gli_streamlist;
while (str) {
strnext = str->next;
if (str->type == strtype_File) {
gli_delete_stream(str);
}
str = strnext;
}
}
strid_t glk_stream_open_memory(char *buf, glui32 buflen, glui32 fmode,
glui32 rock)
{
stream_t *str;
if (fmode != filemode_Read
&& fmode != filemode_Write
&& fmode != filemode_ReadWrite) {
gli_strict_warning("stream_open_memory: illegal filemode");
return 0;
}
str = gli_new_stream(strtype_Memory,
(fmode != filemode_Write),
(fmode != filemode_Read),
rock);
if (!str) {
gli_strict_warning("stream_open_memory: unable to create stream.");
return 0;
}
if (buf && buflen) {
str->buf = (unsigned char *)buf;
str->bufptr = (unsigned char *)buf;
str->buflen = buflen;
str->bufend = str->buf + str->buflen;
if (fmode == filemode_Write)
str->bufeof = (unsigned char *)buf;
else
str->bufeof = str->bufend;
if (gli_register_arr) {
str->arrayrock = (*gli_register_arr)(buf, buflen, "&+#!Cn");
}
}
return str;
}
stream_t *gli_stream_open_window(window_t *win)
{
stream_t *str;
str = gli_new_stream(strtype_Window, FALSE, TRUE, 0);
if (!str)
return NULL;
str->win = win;
return str;
}
strid_t glk_stream_open_file(fileref_t *fref, glui32 fmode,
glui32 rock)
{
stream_t *str;
char modestr[16];
FILE *fl;
if (!fref) {
gli_strict_warning("stream_open_file: invalid fileref ref.");
return 0;
}
/* The spec says that Write, ReadWrite, and WriteAppend create the
file if necessary. However, fopen(filename, "r+") doesn't create
a file. So we have to pre-create it in the ReadWrite and
WriteAppend cases. (We use "a" so as not to truncate, and "b"
because we're going to close it immediately, so it doesn't matter.) */
/* Another Unix quirk: in r+ mode, you're not supposed to flip from
reading to writing or vice versa without doing an fseek. We will
track the most recent operation (as lastop) -- Write, Read, or
0 if either is legal next. */
if (fmode == filemode_ReadWrite || fmode == filemode_WriteAppend) {
fl = fopen(fref->filename, "ab");
if (!fl) {
gli_strict_warning("stream_open_file: unable to open file.");
return 0;
}
fclose(fl);
}
switch (fmode) {
case filemode_Write:
strcpy(modestr, "w");
break;
case filemode_Read:
strcpy(modestr, "r");
break;
case filemode_ReadWrite:
strcpy(modestr, "r+");
break;
case filemode_WriteAppend:
/* Can't use "a" here, because then fseek wouldn't work.
Instead we use "r+" and then fseek to the end. */
strcpy(modestr, "r+");
break;
}
if (!fref->textmode)
strcat(modestr, "b");
fl = fopen(fref->filename, modestr);
if (!fl) {
gli_strict_warning("stream_open_file: unable to open file.");
return 0;
}
if (fmode == filemode_WriteAppend) {
fseek(fl, 0, 2); /* ...to the end. */
}
str = gli_new_stream(strtype_File,
(fmode == filemode_Read || fmode == filemode_ReadWrite),
!(fmode == filemode_Read),
rock);
if (!str) {
gli_strict_warning("stream_open_file: unable to create stream.");
fclose(fl);
return 0;
}
str->file = fl;
str->lastop = 0;
return str;
}
#ifdef GLK_MODULE_UNICODE
strid_t glk_stream_open_memory_uni(glui32 *ubuf, glui32 buflen, glui32 fmode,
glui32 rock)
{
stream_t *str;
if (fmode != filemode_Read
&& fmode != filemode_Write
&& fmode != filemode_ReadWrite) {
gli_strict_warning("stream_open_memory_uni: illegal filemode");
return NULL;
}
str = gli_new_stream(strtype_Memory,
(fmode != filemode_Write),
(fmode != filemode_Read),
rock);
if (!str) {
gli_strict_warning("stream_open_memory_uni: unable to create stream.");
return NULL;
}
str->unicode = TRUE;
if (ubuf && buflen) {
str->ubuf = ubuf;
str->ubufptr = ubuf;
str->buflen = buflen;
str->ubufend = str->ubuf + str->buflen;
if (fmode == filemode_Write)
str->ubufeof = ubuf;
else
str->ubufeof = str->ubufend;
if (gli_register_arr) {
str->arrayrock = (*gli_register_arr)(ubuf, buflen, "&+#!Iu");
}
}
return str;
}
strid_t glk_stream_open_file_uni(fileref_t *fref, glui32 fmode,
glui32 rock)
{
strid_t str = glk_stream_open_file(fref, fmode, rock);
/* Unlovely, but it works in this library */
str->unicode = TRUE;
return str;
}
#endif /* GLK_MODULE_UNICODE */
#ifdef GLK_MODULE_RESOURCE_STREAM
strid_t glk_stream_open_resource(glui32 filenum, glui32 rock)
{
strid_t str;
int isbinary;
giblorb_err_t err;
giblorb_result_t res;
giblorb_map_t *map = giblorb_get_resource_map();
if (!map)
return 0; /* Not running from a blorb file */
err = giblorb_load_resource(map, giblorb_method_Memory, &res, giblorb_ID_Data, filenum);
if (err)
return 0; /* Not found, or some other error */
/* We'll use the in-memory copy of the chunk data as the basis for
our new stream. It's important to not call chunk_unload() until
the stream is closed (and we won't).
This will be memory-hoggish for giant data chunks, but I don't
expect giant data chunks at this point. A more efficient model
would be to use the file on disk, but this requires some hacking
into the file stream code (we'd need to open a new FILE*) and
I don't feel like doing that. */
if (res.chunktype == giblorb_ID_TEXT)
isbinary = FALSE;
else if (res.chunktype == giblorb_ID_BINA
|| res.chunktype == giblorb_make_id('F', 'O', 'R', 'M'))
isbinary = TRUE;
else
return 0; /* Unknown chunk type */
str = gli_new_stream(strtype_Resource,
TRUE, FALSE, rock);
if (!str) {
gli_strict_warning("stream_open_resource: unable to create stream.");
return NULL;
}
str->isbinary = isbinary;
if (res.data.ptr && res.length) {
str->buf = (unsigned char *)res.data.ptr;
str->bufptr = (unsigned char *)res.data.ptr;
str->buflen = res.length;
str->bufend = str->buf + str->buflen;
str->bufeof = str->bufend;
}
return str;
}
strid_t glk_stream_open_resource_uni(glui32 filenum, glui32 rock)
{
strid_t str;
int isbinary;
giblorb_err_t err;
giblorb_result_t res;
giblorb_map_t *map = giblorb_get_resource_map();
if (!map)
return 0; /* Not running from a blorb file */
err = giblorb_load_resource(map, giblorb_method_Memory, &res, giblorb_ID_Data, filenum);
if (err)
return 0; /* Not found, or some other error */
if (res.chunktype == giblorb_ID_TEXT)
isbinary = FALSE;
else if (res.chunktype == giblorb_ID_BINA
|| res.chunktype == giblorb_make_id('F', 'O', 'R', 'M'))
isbinary = TRUE;
else
return 0; /* Unknown chunk type */
str = gli_new_stream(strtype_Resource,
TRUE, FALSE, rock);
if (!str) {
gli_strict_warning("stream_open_resource_uni: unable to create stream.");
return NULL;
}
str->unicode = TRUE;
str->isbinary = isbinary;
/* We have been handed an array of bytes. (They're big-endian
four-byte chunks, or perhaps a UTF-8 byte sequence, rather than
native-endian four-byte integers). So we drop it into buf,
rather than ubuf -- we'll have to do the translation in the
get() functions. */
if (res.data.ptr && res.length) {
str->buf = (unsigned char *)res.data.ptr;
str->bufptr = (unsigned char *)res.data.ptr;
str->buflen = res.length;
str->bufend = str->buf + str->buflen;
str->bufeof = str->bufend;
}
return str;
}
#endif /* GLK_MODULE_RESOURCE_STREAM */
strid_t gli_stream_open_pathname(char *pathname, int writemode,
int textmode, glui32 rock)
{
char modestr[16];
stream_t *str;
FILE *fl;
if (!writemode)
strcpy(modestr, "r");
else
strcpy(modestr, "w");
if (!textmode)
strcat(modestr, "b");
fl = fopen(pathname, modestr);
if (!fl) {
return 0;
}
str = gli_new_stream(strtype_File,
!writemode, writemode, rock);
if (!str) {
fclose(fl);
return 0;
}
str->file = fl;
str->lastop = 0;
return str;
}
strid_t glk_stream_iterate(strid_t str, glui32 *rock)
{
if (!str) {
str = gli_streamlist;
}
else {
str = str->next;
}
if (str) {
if (rock)
*rock = str->rock;
return str;
}
if (rock)
*rock = 0;
return NULL;
}
glui32 glk_stream_get_rock(stream_t *str)
{
if (!str) {
gli_strict_warning("stream_get_rock: invalid ref.");
return 0;
}
return str->rock;
}
void gli_stream_set_current(stream_t *str)
{
gli_currentstr = str;
}
void glk_stream_set_current(stream_t *str)
{
gli_stream_set_current(str);
}
strid_t glk_stream_get_current()
{
if (gli_currentstr)
return gli_currentstr;
else
return 0;
}
void glk_stream_set_position(stream_t *str, glsi32 pos, glui32 seekmode)
{
if (!str) {
gli_strict_warning("stream_set_position: invalid ref");
return;
}
switch (str->type) {
case strtype_Memory:
case strtype_Resource:
if (!str->unicode || str->type == strtype_Resource) {
if (seekmode == seekmode_Current) {
pos = (str->bufptr - str->buf) + pos;
}
else if (seekmode == seekmode_End) {
pos = (str->bufeof - str->buf) + pos;
}
else {
/* pos = pos */
}
if (pos < 0)
pos = 0;
if (pos > (str->bufeof - str->buf))
pos = (str->bufeof - str->buf);
str->bufptr = str->buf + pos;
}
else {
if (seekmode == seekmode_Current) {
pos = (str->ubufptr - str->ubuf) + pos;
}
else if (seekmode == seekmode_End) {
pos = (str->ubufeof - str->ubuf) + pos;
}
else {
/* pos = pos */
}
if (pos < 0)
pos = 0;
if (pos > (str->ubufeof - str->ubuf))
pos = (str->ubufeof - str->ubuf);
str->ubufptr = str->ubuf + pos;
}
break;
case strtype_Window:
/* do nothing; don't pass to echo stream */
break;
case strtype_File:
/* Either reading or writing is legal after an fseek. */
str->lastop = 0;
if (str->unicode) {
/* Use 4 here, rather than sizeof(glui32). */
pos *= 4;
}
fseek(str->file, pos,
((seekmode == seekmode_Current) ? 1 :
((seekmode == seekmode_End) ? 2 : 0)));
break;
}
}
glui32 glk_stream_get_position(stream_t *str)
{
if (!str) {
gli_strict_warning("stream_get_position: invalid ref");
return 0;
}
switch (str->type) {
case strtype_Memory:
case strtype_Resource:
if (!str->unicode || str->type == strtype_Resource) {
return (str->bufptr - str->buf);
}
else {
return (str->ubufptr - str->ubuf);
}
case strtype_File:
if (!str->unicode) {
return ftell(str->file);
}
else {
/* Use 4 here, rather than sizeof(glui32). */
return ftell(str->file) / 4;
}
case strtype_Window:
default:
return 0;
}
}
static void gli_stream_ensure_op(stream_t *str, glui32 op)
{
/* We have to do an fseek() between reading and writing. This will
only come up for ReadWrite or WriteAppend files. */
if (str->lastop != 0 && str->lastop != op) {
long pos = ftell(str->file);
fseek(str->file, pos, SEEK_SET);
}
str->lastop = op;
}
static void gli_put_char(stream_t *str, unsigned char ch)
{
if (!str || !str->writable)
return;
str->writecount++;
switch (str->type) {
case strtype_Memory:
if (!str->unicode) {
if (str->bufptr < str->bufend) {
*(str->bufptr) = ch;
str->bufptr++;
if (str->bufptr > str->bufeof)
str->bufeof = str->bufptr;
}
}
else {
if (str->ubufptr < str->ubufend) {
*(str->ubufptr) = (glui32)ch;
str->ubufptr++;
if (str->ubufptr > str->ubufeof)
str->ubufeof = str->ubufptr;
}
}
break;
case strtype_Window:
if (str->win->line_request) {
gli_strict_warning("put_char: window has pending line request");
break;
}
gli_window_put_char(str->win, ch);
if (str->win->echostr)
gli_put_char(str->win->echostr, ch);
break;
case strtype_File:
gli_stream_ensure_op(str, filemode_Write);
/* Really, if the stream was opened in text mode, we ought to do
character-set conversion here. As it is we're printing a
file of Latin-1 characters. */
if (!str->unicode) {
putc(ch, str->file);
}
else {
/* cheap big-endian stream */
putc(0, str->file);
putc(0, str->file);
putc(0, str->file);
putc(ch, str->file);
}
break;
case strtype_Resource:
/* resource streams are never writable */
break;
}
}
#ifdef GLK_MODULE_UNICODE
static void gli_put_char_uni(stream_t *str, glui32 ch)
{
if (!str || !str->writable)
return;
str->writecount++;
switch (str->type) {
case strtype_Memory:
if (!str->unicode) {
if (ch >= 0x100)
ch = '?';
if (str->bufptr < str->bufend) {
*(str->bufptr) = ch;
str->bufptr++;
if (str->bufptr > str->bufeof)
str->bufeof = str->bufptr;
}
}
else {
if (str->ubufptr < str->ubufend) {
*(str->ubufptr) = ch;
str->ubufptr++;
if (str->ubufptr > str->ubufeof)
str->ubufeof = str->ubufptr;
}
}
break;
case strtype_Window:
if (str->win->line_request) {
gli_strict_warning("put_char_uni: window has pending line request");
break;
}
gli_window_put_char(str->win, ((ch >= 0x100) ? '?' : ch));
if (str->win->echostr)
gli_put_char_uni(str->win->echostr, ch);
break;
case strtype_File:
gli_stream_ensure_op(str, filemode_Write);
if (!str->unicode) {
if (ch >= 0x100)
ch = '?';
putc(ch, str->file);
}
else {
/* cheap big-endian stream */
putc(((ch >> 24) & 0xFF), str->file);
putc(((ch >> 16) & 0xFF), str->file);
putc(((ch >> 8) & 0xFF), str->file);
putc( (ch & 0xFF), str->file);
}
break;
case strtype_Resource:
/* resource streams are never writable */
break;
}
}
#endif /* GLK_MODULE_UNICODE */
static void gli_put_buffer(stream_t *str, char *buf, glui32 len)
{
char *cx;
glui32 lx;
if (!str || !str->writable)
return;
str->writecount += len;
switch (str->type) {
case strtype_Memory:
if (!str->unicode) {
if (str->bufptr >= str->bufend) {
len = 0;
}
else {
if (str->bufptr + len > str->bufend) {
lx = (str->bufptr + len) - str->bufend;
if (lx < len)
len -= lx;
else
len = 0;
}
}
if (len) {
memcpy(str->bufptr, buf, len);
str->bufptr += len;
if (str->bufptr > str->bufeof)
str->bufeof = str->bufptr;
}
}
else {
if (str->ubufptr >= str->ubufend) {
len = 0;
}
else {
if (str->ubufptr + len > str->ubufend) {
lx = (str->ubufptr + len) - str->ubufend;
if (lx < len)
len -= lx;
else
len = 0;
}
}
if (len) {
for (lx=0; lx<len; lx++) {
*str->ubufptr = (unsigned char)(buf[lx]);
str->ubufptr++;
}
if (str->ubufptr > str->ubufeof)
str->ubufeof = str->ubufptr;
}
}
break;
case strtype_Window:
if (str->win->line_request) {
gli_strict_warning("put_buffer: window has pending line request");
break;
}
for (lx=0, cx=buf; lx<len; lx++, cx++) {
gli_window_put_char(str->win, *cx);
}
if (str->win->echostr)
gli_put_buffer(str->win->echostr, buf, len);
break;
case strtype_File:
gli_stream_ensure_op(str, filemode_Write);
/* Really, if the stream was opened in text mode, we ought to do
character-set conversion here. As it is we're printing a
file of Latin-1 characters. */
if (!str->unicode) {
fwrite((unsigned char *)buf, 1, len, str->file);
}
else {
/* cheap big-endian stream */
for (lx=0; lx<len; lx++) {
unsigned char ch = ((unsigned char *)buf)[lx];
putc(((ch >> 24) & 0xFF), str->file);
putc(((ch >> 16) & 0xFF), str->file);
putc(((ch >> 8) & 0xFF), str->file);
putc( (ch & 0xFF), str->file);
}
}
break;
case strtype_Resource:
/* resource streams are never writable */
break;
}
}
static void gli_set_style(stream_t *str, glui32 val)
{
if (!str || !str->writable)
return;
if (val >= style_NUMSTYLES)
val = 0;
switch (str->type) {
case strtype_Window:
str->win->style = val;
if (str->win->echostr)
gli_set_style(str->win->echostr, val);
break;
}
}
void gli_stream_echo_line(stream_t *str, char *buf, glui32 len)
{
/* This is only used to echo line input to an echo stream. See
the line input methods in gtw_grid and gtw_buf. */
gli_put_buffer(str, buf, len);
gli_put_char(str, '\n');
}
#ifdef GLK_MODULE_UNICODE
void gli_stream_echo_line_uni(stream_t *str, glui32 *buf, glui32 len)
{
glui32 ix;
/* This is only used to echo line input to an echo stream. See
glk_select(). */
for (ix=0; ix<len; ix++) {
gli_put_char_uni(str, buf[ix]);
}
gli_put_char(str, '\n');
}
#else
void gli_stream_echo_line_uni(stream_t *str, glui32 *buf, glui32 len)
{
gli_strict_warning("stream_echo_line_uni: called with no Unicode line request");
}
#endif /* GLK_MODULE_UNICODE */
static glsi32 gli_get_char(stream_t *str, int want_unicode)
{
if (!str || !str->readable)
return -1;
switch (str->type) {
case strtype_Resource:
if (str->unicode) {
glui32 ch;
if (str->isbinary) {
/* cheap big-endian stream */
if (str->bufptr >= str->bufend)
return -1;
ch = *(str->bufptr);
str->bufptr++;
if (str->bufptr >= str->bufend)
return -1;
ch = (ch << 8) | (*(str->bufptr) & 0xFF);
str->bufptr++;
if (str->bufptr >= str->bufend)
return -1;
ch = (ch << 8) | (*(str->bufptr) & 0xFF);
str->bufptr++;
if (str->bufptr >= str->bufend)
return -1;
ch = (ch << 8) | (*(str->bufptr) & 0xFF);
str->bufptr++;
}
else {
/* slightly less cheap UTF8 stream */
glui32 val0, val1, val2, val3;
if (str->bufptr >= str->bufend)
return -1;
val0 = *(str->bufptr);
str->bufptr++;
if (val0 < 0x80) {
ch = val0;
}
else {
if (str->bufptr >= str->bufend)
return -1;
val1 = *(str->bufptr);
str->bufptr++;
if ((val1 & 0xC0) != 0x80)
return -1;
if ((val0 & 0xE0) == 0xC0) {
ch = (val0 & 0x1F) << 6;
ch |= (val1 & 0x3F);
}
else {
if (str->bufptr >= str->bufend)
return -1;
val2 = *(str->bufptr);
str->bufptr++;
if ((val2 & 0xC0) != 0x80)
return -1;
if ((val0 & 0xF0) == 0xE0) {
ch = (((val0 & 0xF)<<12) & 0x0000F000);
ch |= (((val1 & 0x3F)<<6) & 0x00000FC0);
ch |= (((val2 & 0x3F)) & 0x0000003F);
}
else if ((val0 & 0xF0) == 0xF0) {
if (str->bufptr >= str->bufend)
return -1;
val3 = *(str->bufptr);
str->bufptr++;
if ((val3 & 0xC0) != 0x80)
return -1;
ch = (((val0 & 0x7)<<18) & 0x1C0000);
ch |= (((val1 & 0x3F)<<12) & 0x03F000);
ch |= (((val2 & 0x3F)<<6) & 0x000FC0);
ch |= (((val3 & 0x3F)) & 0x00003F);
}
else {
return -1;
}
}
}
}
str->readcount++;
if (!want_unicode && ch >= 0x100)
return '?';
return (glsi32)ch;
}
/* for text streams, fall through to memory case */
case strtype_Memory:
if (!str->unicode) {
if (str->bufptr < str->bufend) {
unsigned char ch;
ch = *(str->bufptr);
str->bufptr++;
str->readcount++;
return ch;
}
else {
return -1;
}
}
else {
if (str->ubufptr < str->ubufend) {
glui32 ch;