--- /dev/null
+#include "charset.h"
+#include "magic.h"
+#include "stream.h"
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <glib.h>
+#include <glib/gstdio.h>
+
+/*
+ *
+ **************** WRITING FUNCTIONS ********************************************
+ *
+ */
+
+/* Internal function: write a UTF-8 string to a text grid window's text buffer. */
+static void
+write_utf8_to_grid(winid_t win, gchar *s)
+{
+ if(win->input_request_type == INPUT_REQUEST_LINE || win->input_request_type == INPUT_REQUEST_LINE_UNICODE)
+ {
+ ILLEGAL("Tried to print to a text grid window with line input pending.");
+ return;
+ }
+
+ /* Number of characters to insert */
+ glong length = g_utf8_strlen(s, -1);
+ glong chars_left = length;
+
+ gdk_threads_enter();
+
+ GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
+ GtkTextMark *cursor = gtk_text_buffer_get_mark(buffer, "cursor_position");
+
+ /* Get cursor position */
+ GtkTextIter start;
+ gtk_text_buffer_get_iter_at_mark(buffer, &start, cursor);
+ /* Spaces available on this line */
+ gint available_space = win->width - gtk_text_iter_get_line_offset(&start);
+
+ while(chars_left > available_space && !gtk_text_iter_is_end(&start))
+ {
+ GtkTextIter end = start;
+ gtk_text_iter_forward_to_line_end(&end);
+ gtk_text_buffer_delete(buffer, &start, &end);
+ gtk_text_buffer_insert(buffer, &start, s + (length - chars_left), available_space);
+ chars_left -= available_space;
+ gtk_text_iter_forward_line(&start);
+ available_space = win->width;
+ }
+ if(!gtk_text_iter_is_end(&start))
+ {
+ GtkTextIter end = start;
+ gtk_text_iter_forward_chars(&end, chars_left);
+ gtk_text_buffer_delete(buffer, &start, &end);
+ gtk_text_buffer_insert(buffer, &start, s + (length - chars_left), -1);
+ }
+
+ gtk_text_buffer_move_mark(buffer, cursor, &start);
+
+ gdk_threads_leave();
+}
+
+/* Internal function: write a UTF-8 string to a text buffer window's text buffer. */
+static void
+write_utf8_to_window(winid_t win, gchar *s)
+{
+ if(win->input_request_type == INPUT_REQUEST_LINE || win->input_request_type == INPUT_REQUEST_LINE_UNICODE)
+ {
+ ILLEGAL("Tried to print to a text buffer window with line input pending.");
+ return;
+ }
+
+ gdk_threads_enter();
+
+ GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
+
+ GtkTextIter iter;
+ gtk_text_buffer_get_end_iter(buffer, &iter);
+ gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, s, -1, win->window_stream->style, NULL);
+
+ gdk_threads_leave();
+}
+
+/* Internal function: write a Latin-1 buffer with length to a stream. */
+static void
+write_buffer_to_stream(strid_t str, gchar *buf, glui32 len)
+{
+ switch(str->type)
+ {
+ case STREAM_TYPE_WINDOW:
+ /* Each window type has a different way of printing to it */
+ switch(str->window->type)
+ {
+ /* Printing to these windows' streams does nothing */
+ case wintype_Blank:
+ case wintype_Pair:
+ case wintype_Graphics:
+ str->write_count += len;
+ break;
+
+ /* Text grid window */
+ case wintype_TextGrid:
+ {
+ gchar *utf8 = convert_latin1_to_utf8(buf, len);
+ if(utf8 != NULL)
+ {
+ /* FIXME: What to do if string contains \n? Split the input string at newlines and write each string separately? */
+ write_utf8_to_grid(str->window, utf8);
+ g_free(utf8);
+ }
+ }
+ str->write_count += len;
+ break;
+
+ /* Text buffer window */
+ case wintype_TextBuffer:
+ {
+ gchar *utf8 = convert_latin1_to_utf8(buf, len);
+ if(utf8 != NULL)
+ {
+ write_utf8_to_window(str->window, utf8);
+ g_free(utf8);
+ }
+ }
+ str->write_count += len;
+ break;
+ default:
+ ILLEGAL_PARAM("Unknown window type: %u", str->window->type);
+ }
+
+ /* Now write the same buffer to the window's echo stream */
+ if(str->window->echo_stream != NULL)
+ write_buffer_to_stream(str->window->echo_stream, buf, len);
+
+ break;
+
+ case STREAM_TYPE_MEMORY:
+ if(str->unicode && str->ubuffer)
+ {
+ int foo = 0;
+ while(str->mark < str->buflen && foo < len)
+ str->ubuffer[str->mark++] = (unsigned char)buf[foo++];
+ }
+ if(!str->unicode && str->buffer)
+ {
+ int copycount = MIN(len, str->buflen - str->mark);
+ memmove(str->buffer + str->mark, buf, copycount);
+ str->mark += copycount;
+ }
+
+ str->write_count += len;
+ break;
+
+ case STREAM_TYPE_FILE:
+ if(str->binary)
+ {
+ if(str->unicode)
+ {
+ gchar *writebuffer = convert_latin1_to_ucs4be_string(buf, len);
+ fwrite(writebuffer, sizeof(gchar), len * 4, str->file_pointer);
+ g_free(writebuffer);
+ }
+ else /* Regular file */
+ {
+ fwrite(buf, sizeof(gchar), len, str->file_pointer);
+ }
+ }
+ else /* Text mode is the same for Unicode and regular files */
+ {
+ gchar *utf8 = convert_latin1_to_utf8(buf, len);
+ if(utf8 != NULL)
+ {
+ g_fprintf(str->file_pointer, "%s", utf8);
+ g_free(utf8);
+ }
+ }
+
+ str->write_count += len;
+ break;
+ default:
+ ILLEGAL_PARAM("Unknown stream type: %u", str->type);
+ }
+}
+
+/* Internal function: write a Unicode buffer with length to a stream. */
+static void
+write_buffer_to_stream_uni(strid_t str, glui32 *buf, glui32 len)
+{
+ switch(str->type)
+ {
+ case STREAM_TYPE_WINDOW:
+ /* Each window type has a different way of printing to it */
+ switch(str->window->type)
+ {
+ /* Printing to these windows' streams does nothing */
+ case wintype_Blank:
+ case wintype_Pair:
+ case wintype_Graphics:
+ str->write_count += len;
+ break;
+
+ /* Text grid window */
+ case wintype_TextGrid:
+ {
+ gchar *utf8 = convert_ucs4_to_utf8(buf, len);
+ if(utf8 != NULL)
+ {
+ /* FIXME: What to do if string contains \n? Split the input string at newlines and write each string separately? */
+ write_utf8_to_grid(str->window, utf8);
+ g_free(utf8);
+ }
+ }
+ str->write_count += len;
+ break;
+
+ /* Text buffer window */
+ case wintype_TextBuffer:
+ {
+ gchar *utf8 = convert_ucs4_to_utf8(buf, len);
+ if(utf8 != NULL)
+ {
+ write_utf8_to_window(str->window, utf8);
+ g_free(utf8);
+ }
+ }
+ str->write_count += len;
+ break;
+ default:
+ ILLEGAL_PARAM("Unknown window type: %u", str->window->type);
+ }
+
+ /* Now write the same buffer to the window's echo stream */
+ if(str->window->echo_stream != NULL)
+ write_buffer_to_stream_uni(str->window->echo_stream, buf, len);
+
+ break;
+
+ case STREAM_TYPE_MEMORY:
+ if(str->unicode && str->ubuffer)
+ {
+ int copycount = MIN(len, str->buflen - str->mark);
+ memmove(str->ubuffer + str->mark, buf, copycount * sizeof(glui32));
+ str->mark += copycount;
+ }
+ if(!str->unicode && str->buffer)
+ {
+ gchar *latin1 = convert_ucs4_to_latin1_binary(buf, len);
+ int copycount = MIN(len, str->buflen - str->mark);
+ memmove(str->buffer + str->mark, latin1, copycount);
+ g_free(latin1);
+ str->mark += copycount;
+ }
+
+ str->write_count += len;
+ break;
+
+ case STREAM_TYPE_FILE:
+ if(str->binary)
+ {
+ if(str->unicode)
+ {
+ gchar *writebuffer = convert_ucs4_to_ucs4be_string(buf, len);
+ fwrite(writebuffer, sizeof(gchar), len * 4, str->file_pointer);
+ g_free(writebuffer);
+ }
+ else /* Regular file */
+ {
+ gchar *latin1 = convert_ucs4_to_latin1_binary(buf, len);
+ fwrite(latin1, sizeof(gchar), len, str->file_pointer);
+ g_free(latin1);
+ }
+ }
+ else /* Text mode is the same for Unicode and regular files */
+ {
+ gchar *utf8 = convert_ucs4_to_utf8(buf, len);
+ if(utf8 != NULL)
+ {
+ g_fprintf(str->file_pointer, "%s", utf8);
+ g_free(utf8);
+ }
+ }
+
+ str->write_count += len;
+ break;
+ default:
+ ILLEGAL_PARAM("Unknown stream type: %u", str->type);
+ }
+}
+
+/**
+ * glk_put_char_stream:
+ * @str: An output stream.
+ * @ch: A character in Latin-1 encoding.
+ *
+ * The same as glk_put_char(), except that you specify a stream @str to print
+ * to, instead of using the current stream. It is illegal for @str to be %NULL,
+ * or an input-only stream.
+ */
+void
+glk_put_char_stream(strid_t str, unsigned char ch)
+{
+ VALID_STREAM(str, return);
+ g_return_if_fail(str->file_mode != filemode_Read);
+
+ write_buffer_to_stream(str, (gchar *)&ch, 1);
+}
+
+/**
+ * glk_put_char_stream_uni:
+ * @str: An output stream.
+ * @ch: A Unicode code point.
+ *
+ * The same as glk_put_char_uni(), except that you specify a stream @str to
+ * print to, instead of using the current stream. It is illegal for @str to be
+ * %NULL, or an input-only stream.
+ */
+void
+glk_put_char_stream_uni(strid_t str, glui32 ch)
+{
+ VALID_STREAM(str, return);
+ g_return_if_fail(str->file_mode != filemode_Read);
+
+ write_buffer_to_stream_uni(str, &ch, 1);
+}
+
+/**
+ * glk_put_string_stream:
+ * @str: An output stream.
+ * @s: A null-terminated string in Latin-1 encoding.
+ *
+ * The same as glk_put_string(), except that you specify a stream @str to print
+ * to, instead of using the current stream. It is illegal for @str to be %NULL,
+ * or an input-only stream.
+ */
+void
+glk_put_string_stream(strid_t str, char *s)
+{
+ VALID_STREAM(str, return);
+ g_return_if_fail(str->file_mode != filemode_Read);
+
+ write_buffer_to_stream(str, s, strlen(s));
+}
+
+/**
+ * glk_put_string_stream_uni:
+ * @str: An output stream.
+ * @s: A null-terminated array of Unicode code points.
+ *
+ * The same as glk_put_string_uni(), except that you specify a stream @str to
+ * print to, instead of using the current stream. It is illegal for @str to be
+ * %NULL, or an input-only stream.
+ */
+void
+glk_put_string_stream_uni(strid_t str, glui32 *s)
+{
+ VALID_STREAM(str, return);
+ g_return_if_fail(str->file_mode != filemode_Read);
+
+ /* An impromptu strlen() for glui32 arrays */
+ glong len = 0;
+ glui32 *ptr = s;
+ while(*ptr++)
+ len++;
+ write_buffer_to_stream_uni(str, s, len);
+}
+
+/**
+ * glk_put_buffer_stream:
+ * @str: An output stream.
+ * @buf: An array of characters in Latin-1 encoding.
+ * @len: Length of @buf.
+ *
+ * The same as glk_put_buffer(), except that you specify a stream @str to print
+ * to, instead of using the current stream. It is illegal for @str to be %NULL,
+ * or an input-only stream.
+ */
+void
+glk_put_buffer_stream(strid_t str, char *buf, glui32 len)
+{
+ VALID_STREAM(str, return);
+ g_return_if_fail(str->file_mode != filemode_Read);
+
+ write_buffer_to_stream(str, buf, len);
+}
+
+/**
+ * glk_put_buffer_stream_uni:
+ * @str: An output stream.
+ * @buf: An array of Unicode code points.
+ * @len: Length of @buf.
+ *
+ * The same as glk_put_buffer_uni(), except that you specify a stream @str to
+ * print to, instead of using the current stream. It is illegal for @str to be
+ * %NULL, or an input-only stream.
+ */
+void
+glk_put_buffer_stream_uni(strid_t str, glui32 *buf, glui32 len)
+{
+ VALID_STREAM(str, return);
+ g_return_if_fail(str->file_mode != filemode_Read);
+
+ write_buffer_to_stream_uni(str, buf, len);
+}
+
+/*
+ *
+ **************** READING FUNCTIONS ********************************************
+ *
+ */
+
+/* Internal function: Read one big-endian four-byte character from file fp and
+return it as a Unicode code point, or -1 on EOF */
+static glsi32
+read_ucs4be_char_from_file(FILE *fp)
+{
+ unsigned char readbuffer[4];
+ if(fread(readbuffer, sizeof(unsigned char), 4, fp) < 4)
+ return -1; /* EOF */
+ return
+ readbuffer[0] << 24 |
+ readbuffer[1] << 16 |
+ readbuffer[2] << 8 |
+ readbuffer[3];
+}
+
+/* Internal function: Read one UTF-8 character, which may be more than one byte,
+from file fp and return it as a Unicode code point, or -1 on EOF */
+static glsi32
+read_utf8_char_from_file(FILE *fp)
+{
+ gchar readbuffer[4] = {0, 0, 0, 0}; /* Max UTF-8 width */
+ int foo;
+ gunichar charresult = (gunichar)-2;
+ for(foo = 0; foo < 4 && charresult == (gunichar)-2; foo++)
+ {
+ int ch = fgetc(fp);
+ if(ch == EOF)
+ return -1;
+ readbuffer[foo] = (gchar)ch;
+ charresult = g_utf8_get_char_validated(readbuffer, foo + 1);
+ /* charresult is -1 if invalid, -2 if incomplete, and the unicode code
+ point otherwise */
+ }
+ /* Silently return unknown characters as 0xFFFD, Replacement Character */
+ if(charresult == (gunichar)-1 || charresult == (gunichar)-2)
+ return 0xFFFD;
+ return charresult;
+}
+
+/* Internal function: Tell whether this code point is a Unicode newline. The
+file pointer and eight-bit flag are included in case the newline is a CR
+(U+000D). If the next character is LF (U+000A) then it also belongs to the
+newline. */
+static gboolean
+is_unicode_newline(glsi32 ch, FILE *fp, gboolean utf8)
+{
+ if(ch == 0x0A || ch == 0x85 || ch == 0x0C || ch == 0x2028 || ch == 0x2029)
+ return TRUE;
+ if(ch == 0x0D) {
+ glsi32 ch2 = utf8? read_utf8_char_from_file(fp) :
+ read_ucs4be_char_from_file(fp);
+ if(ch2 != 0x0A)
+ if(fseek(fp, utf8? -1 : -4, SEEK_CUR) == -1);
+ WARNING_S("Seek failed on stream", g_strerror(errno) );
+ return TRUE;
+ }
+ return FALSE;
+}
+
+/* Internal function: Read one character from a stream. Returns a value which
+ can be returned unchanged by glk_get_char_stream_uni(), but
+ glk_get_char_stream() must replace high values by the placeholder character. */
+static glsi32
+get_char_stream_common(strid_t str)
+{
+ switch(str->type)
+ {
+ case STREAM_TYPE_MEMORY:
+ if(str->unicode)
+ {
+ if(!str->ubuffer || str->mark >= str->buflen)
+ return -1;
+ glui32 ch = str->ubuffer[str->mark++];
+ str->read_count++;
+ return ch;
+ }
+ else
+ {
+ if(!str->buffer || str->mark >= str->buflen)
+ return -1;
+ unsigned char ch = str->buffer[str->mark++];
+ str->read_count++;
+ return ch;
+ }
+ break;
+
+ case STREAM_TYPE_FILE:
+ if(str->binary)
+ {
+ if(str->unicode)
+ {
+ glsi32 ch = read_ucs4be_char_from_file(str->file_pointer);
+ if(ch == -1)
+ return -1;
+ str->read_count++;
+ return ch;
+ }
+ else /* Regular file */
+ {
+ int ch = fgetc(str->file_pointer);
+ if(ch == EOF)
+ return -1;
+
+ str->read_count++;
+ return ch;
+ }
+ }
+ else /* Text mode is the same for Unicode and regular files */
+ {
+ glsi32 ch = read_utf8_char_from_file(str->file_pointer);
+ if(ch == -1)
+ return -1;
+
+ str->read_count++;
+ return ch;
+ }
+ default:
+ ILLEGAL_PARAM("Reading illegal on stream type: %u", str->type);
+ return -1;
+ }
+}
+
+/**
+ * glk_get_char_stream:
+ * @str: An input stream.
+ *
+ * Reads one character from the stream @str. (There is no notion of a
+ * <quote>current input stream.</quote>) It is illegal for @str to be %NULL, or
+ * an output-only stream.
+ *
+ * The result will be between 0 and 255. As with all basic text functions, Glk
+ * assumes the Latin-1 encoding. See <link
+ * linkend="chimara-Character-Encoding">Character Encoding</link>. If the end
+ * of the stream has been reached, the result will be -1.
+ *
+ * <note><para>
+ * Note that high-bit characters (128..255) are <emphasis>not</emphasis>
+ * returned as negative numbers.
+ * </para></note>
+ *
+ * If the stream contains Unicode data — for example, if it was created
+ * with glk_stream_open_file_uni() or glk_stream_open_memory_uni() — then
+ * characters beyond 255 will be returned as 0x3F (<code>"?"</code>).
+ *
+ * It is usually more efficient to read several characters at once with
+ * glk_get_buffer_stream() or glk_get_line_stream(), as opposed to calling
+ * glk_get_char_stream() several times.
+ *
+ * Returns: A character value between 0 and 255, or -1 on end of stream.
+ */
+glsi32
+glk_get_char_stream(strid_t str)
+{
+ VALID_STREAM(str, return -1);
+ g_return_val_if_fail(str->file_mode == filemode_Read || str->file_mode == filemode_ReadWrite, -1);
+
+ glsi32 ch = get_char_stream_common(str);
+ return (ch > 0xFF)? PLACEHOLDER : ch;
+}
+
+/**
+ * glk_get_char_stream_uni:
+ * @str: An input stream.
+ *
+ * Reads one character from the stream @str. The result will be between 0 and
+ * 0x7FFFFFFF. If the end of the stream has been reached, the result will be -1.
+ *
+ * Returns: A value between 0 and 0x7FFFFFFF, or -1 on end of stream.
+ */
+glsi32
+glk_get_char_stream_uni(strid_t str)
+{
+ VALID_STREAM(str, return -1);
+ g_return_val_if_fail(str->file_mode == filemode_Read || str->file_mode == filemode_ReadWrite, -1);
+
+ return get_char_stream_common(str);
+}
+
+/**
+ * glk_get_buffer_stream:
+ * @str: An input stream.
+ * @buf: A buffer with space for at least @len characters.
+ * @len: The number of characters to read.
+ *
+ * Reads @len characters from @str, unless the end of stream is reached first.
+ * No terminal null is placed in the buffer.
+ *
+ * Returns: The number of characters actually read.
+ */
+glui32
+glk_get_buffer_stream(strid_t str, char *buf, glui32 len)
+{
+ VALID_STREAM(str, return 0);
+ g_return_val_if_fail(str->file_mode == filemode_Read || str->file_mode == filemode_ReadWrite, 0);
+ g_return_val_if_fail(buf != NULL, 0);
+
+ switch(str->type)
+ {
+ case STREAM_TYPE_MEMORY:
+ {
+ int copycount = 0;
+ if(str->unicode)
+ {
+ while(copycount < len && str->ubuffer && str->mark < str->buflen)
+ {
+ glui32 ch = str->ubuffer[str->mark++];
+ buf[copycount++] = (ch > 0xFF)? '?' : (char)ch;
+ }
+ }
+ else
+ {
+ if(str->buffer) /* if not, copycount stays 0 */
+ copycount = MIN(len, str->buflen - str->mark);
+ memmove(buf, str->buffer + str->mark, copycount);
+ str->mark += copycount;
+ }
+
+ str->read_count += copycount;
+ return copycount;
+ }
+ case STREAM_TYPE_FILE:
+ if(str->binary)
+ {
+ if(str->unicode) /* Binary file with 4-byte characters */
+ {
+ /* Read len characters of 4 bytes each */
+ unsigned char *readbuffer = g_new0(unsigned char, 4 * len);
+ size_t count = fread(readbuffer, sizeof(unsigned char), 4 * len, str->file_pointer);
+ /* If there was an incomplete character */
+ if(count % 4 != 0)
+ {
+ count -= count % 4;
+ WARNING("Incomplete character in binary Unicode file");
+ }
+
+ int foo;
+ for(foo = 0; foo < count; foo += 4)
+ {
+ glsi32 ch = readbuffer[foo] << 24
+ | readbuffer[foo + 1] << 16
+ | readbuffer[foo + 2] << 8
+ | readbuffer[foo + 3];
+ buf[foo / 4] = (ch > 255)? 0x3F : (char)ch;
+ }
+ g_free(readbuffer);
+ str->read_count += count / 4;
+ return count / 4;
+ }
+ else /* Regular binary file */
+ {
+ size_t count = fread(buf, sizeof(char), len, str->file_pointer);
+ str->read_count += count;
+ return count;
+ }
+ }
+ else /* Text mode is the same for Unicode and regular files */
+ {
+ /* Do it character-by-character */
+ int foo;
+ for(foo = 0; foo < len; foo++)
+ {
+ glsi32 ch = read_utf8_char_from_file(str->file_pointer);
+ if(ch == -1)
+ break;
+ str->read_count++;
+ buf[foo] = (ch > 0xFF)? 0x3F : (gchar)ch;
+ }
+ return foo;
+ }
+ default:
+ ILLEGAL_PARAM("Reading illegal on stream type: %u", str->type);
+ return 0;
+ }
+}
+
+/**
+ * glk_get_buffer_stream_uni:
+ * @str: An input stream.
+ * @buf: A buffer with space for at least @len Unicode code points.
+ * @len: The number of characters to read.
+ *
+ * Reads @len Unicode characters from @str, unless the end of stream is reached
+ * first. No terminal null is placed in the buffer.
+ *
+ * Returns: The number of Unicode characters actually read.
+ */
+glui32
+glk_get_buffer_stream_uni(strid_t str, glui32 *buf, glui32 len)
+{
+ VALID_STREAM(str, return 0);
+ g_return_val_if_fail(str->file_mode == filemode_Read || str->file_mode == filemode_ReadWrite, 0);
+ g_return_val_if_fail(buf != NULL, 0);
+
+ switch(str->type)
+ {
+ case STREAM_TYPE_MEMORY:
+ {
+ int copycount = 0;
+ if(str->unicode)
+ {
+ if(str->ubuffer) /* if not, copycount stays 0 */
+ copycount = MIN(len, str->buflen - str->mark);
+ memmove(buf, str->ubuffer + str->mark, copycount * 4);
+ str->mark += copycount;
+ }
+ else
+ {
+ while(copycount < len && str->buffer && str->mark < str->buflen)
+ {
+ unsigned char ch = str->buffer[str->mark++];
+ buf[copycount++] = ch;
+ }
+ }
+
+ str->read_count += copycount;
+ return copycount;
+ }
+ case STREAM_TYPE_FILE:
+ if(str->binary)
+ {
+ if(str->unicode) /* Binary file with 4-byte characters */
+ {
+ /* Read len characters of 4 bytes each */
+ unsigned char *readbuffer = g_new0(unsigned char, 4 * len);
+ size_t count = fread(readbuffer, sizeof(unsigned char), 4 * len, str->file_pointer);
+ /* If there was an incomplete character */
+ if(count % 4 != 0)
+ {
+ count -= count % 4;
+ WARNING("Incomplete character in binary Unicode file");
+ }
+
+ int foo;
+ for(foo = 0; foo < count; foo += 4)
+ buf[foo / 4] = readbuffer[foo] << 24
+ | readbuffer[foo + 1] << 16
+ | readbuffer[foo + 2] << 8
+ | readbuffer[foo + 3];
+ g_free(readbuffer);
+ str->read_count += count / 4;
+ return count / 4;
+ }
+ else /* Regular binary file */
+ {
+ unsigned char *readbuffer = g_new0(unsigned char, len);
+ size_t count = fread(readbuffer, sizeof(unsigned char), len, str->file_pointer);
+ int foo;
+ for(foo = 0; foo < count; foo++)
+ buf[foo] = readbuffer[foo];
+ g_free(readbuffer);
+ str->read_count += count;
+ return count;
+ }
+ }
+ else /* Text mode is the same for Unicode and regular files */
+ {
+ /* Do it character-by-character */
+ int foo;
+ for(foo = 0; foo < len; foo++)
+ {
+ glsi32 ch = read_utf8_char_from_file(str->file_pointer);
+ if(ch == -1)
+ break;
+ str->read_count++;
+ buf[foo] = ch;
+ }
+ return foo;
+ }
+ default:
+ ILLEGAL_PARAM("Reading illegal on stream type: %u", str->type);
+ return 0;
+ }
+}
+
+/**
+ * glk_get_line_stream:
+ * @str: An input stream.
+ * @buf: A buffer with space for at least @len characters.
+ * @len: The number of characters to read, plus one.
+ *
+ * Reads characters from @str, until either
+ * <inlineequation>
+ * <alt>@len - 1</alt>
+ * <mathphrase>@len - 1</mathphrase>
+ * </inlineequation>
+ * characters have been read or a newline has been read. It then puts a
+ * terminal null (<code>'\0'</code>) aracter on
+ * the end. It returns the number of characters actually read, including the
+ * newline (if there is one) but not including the terminal null.
+ *
+ * Returns: The number of characters actually read.
+ */
+glui32
+glk_get_line_stream(strid_t str, char *buf, glui32 len)
+{
+ VALID_STREAM(str, return 0);
+ g_return_val_if_fail(str->file_mode == filemode_Read || str->file_mode == filemode_ReadWrite, 0);
+ g_return_val_if_fail(buf != NULL, 0);
+
+ switch(str->type)
+ {
+ case STREAM_TYPE_MEMORY:
+ {
+ int copycount = 0;
+ if(str->unicode)
+ {
+ /* Do it character-by-character */
+ while(copycount < len - 1 && str->ubuffer && str->mark < str->buflen)
+ {
+ glui32 ch = str->ubuffer[str->mark++];
+ /* Check for Unicode newline; slightly different than
+ in file streams */
+ if(ch == 0x0A || ch == 0x85 || ch == 0x0C || ch == 0x2028 || ch == 0x2029)
+ {
+ buf[copycount++] = '\n';
+ break;
+ }
+ if(ch == 0x0D)
+ {
+ if(str->ubuffer[str->mark] == 0x0A)
+ str->mark++; /* skip past next newline */
+ buf[copycount++] = '\n';
+ break;
+ }
+ buf[copycount++] = (ch > 0xFF)? '?' : (char)ch;
+ }
+ buf[copycount] = '\0';
+ }
+ else
+ {
+ if(str->buffer) /* if not, copycount stays 0 */
+ copycount = MIN(len - 1, str->buflen - str->mark);
+ char *endptr = memccpy(buf, str->buffer + str->mark, '\n', copycount);
+ if(endptr) /* newline was found */
+ copycount = endptr - buf; /* Real copy count */
+ buf[copycount] = '\0';
+ str->mark += copycount;
+ }
+
+ str->read_count += copycount;
+ return copycount;
+ }
+ case STREAM_TYPE_FILE:
+ if(str->binary)
+ {
+ if(str->unicode) /* Binary file with 4-byte characters */
+ {
+ /* Do it character-by-character */
+ int foo;
+ for(foo = 0; foo < len - 1; foo++)
+ {
+ glsi32 ch = read_ucs4be_char_from_file(str->file_pointer);
+ if(ch == -1)
+ {
+ buf[foo] = '\0';
+ return foo - 1;
+ }
+ str->read_count++;
+ if(is_unicode_newline(ch, str->file_pointer, FALSE))
+ {
+ buf[foo] = '\n';
+ buf[foo + 1] = '\0';
+ return foo;
+ }
+ buf[foo] = (ch > 0xFF)? '?' : (char)ch;
+ }
+ buf[len] = '\0';
+ return foo;
+ }
+ else /* Regular binary file */
+ {
+ fgets(buf, len, str->file_pointer);
+ str->read_count += strlen(buf);
+ return strlen(buf);
+ }
+ }
+ else /* Text mode is the same for Unicode and regular files */
+ {
+ /* Do it character-by-character */
+ int foo;
+ for(foo = 0; foo < len - 1; foo++)
+ {
+ glsi32 ch = read_utf8_char_from_file(str->file_pointer);
+ if(ch == -1)
+ {
+ buf[foo] = '\0';
+ return foo - 1;
+ }
+ str->read_count++;
+ if(is_unicode_newline(ch, str->file_pointer, TRUE))
+ {
+ buf[foo] = '\n';
+ buf[foo + 1] = '\0';
+ return foo;
+ }
+ buf[foo] = (ch > 0xFF)? 0x3F : (char)ch;
+ }
+ buf[len] = '\0';
+ return foo;
+ }
+ default:
+ ILLEGAL_PARAM("Reading illegal on stream type: %u", str->type);
+ return 0;
+ }
+}
+
+/**
+ * glk_get_line_stream_uni:
+ * @str: An input stream.
+ * @buf: A buffer with space for at least @len Unicode code points.
+ * @len: The number of characters to read, plus one.
+ *
+ * Reads Unicode characters from @str, until either
+ * <inlineequation>
+ * <alt>@len - 1</alt>
+ * <mathphrase>@len - 1</mathphrase>
+ * </inlineequation>
+ * Unicode characters have been read or a newline has been read. It then puts a
+ * terminal null (a zero value) on the end.
+ *
+ * Returns: The number of characters actually read, including the newline (if
+ * there is one) but not including the terminal null.
+ */
+glui32
+glk_get_line_stream_uni(strid_t str, glui32 *buf, glui32 len)
+{
+ VALID_STREAM(str, return 0);
+ g_return_val_if_fail(str->file_mode == filemode_Read || str->file_mode == filemode_ReadWrite, 0);
+ g_return_val_if_fail(buf != NULL, 0);
+
+ switch(str->type)
+ {
+ case STREAM_TYPE_MEMORY:
+ {
+ int copycount = 0;
+ if(str->unicode)
+ {
+ /* Do it character-by-character */
+ while(copycount < len - 1 && str->ubuffer && str->mark < str->buflen)
+ {
+ glui32 ch = str->ubuffer[str->mark++];
+ /* Check for Unicode newline; slightly different than
+ in file streams */
+ if(ch == 0x0A || ch == 0x85 || ch == 0x0C || ch == 0x2028 || ch == 0x2029)
+ {
+ buf[copycount++] = '\n';
+ break;
+ }
+ if(ch == 0x0D)
+ {
+ if(str->ubuffer[str->mark] == 0x0A)
+ str->mark++; /* skip past next newline */
+ buf[copycount++] = '\n';
+ break;
+ }
+ buf[copycount++] = ch;
+ }
+ buf[copycount] = '\0';
+ }
+ else
+ {
+ /* No recourse to memccpy(), so do it character-by-character */
+ while(copycount < len - 1 && str->buffer && str->mark < str->buflen)
+ {
+ gchar ch = str->buffer[str->mark++];
+ /* Check for newline */
+ if(ch == '\n') /* Also check for \r and \r\n? */
+ {
+ buf[copycount++] = '\n';
+ break;
+ }
+ buf[copycount++] = (unsigned char)ch;
+ }
+ buf[copycount] = 0;
+ }
+
+ str->read_count += copycount;
+ return copycount;
+ }
+ case STREAM_TYPE_FILE:
+ if(str->binary)
+ {
+ if(str->unicode) /* Binary file with 4-byte characters */
+ {
+ /* Do it character-by-character */
+ int foo;
+ for(foo = 0; foo < len - 1; foo++)
+ {
+ glsi32 ch = read_ucs4be_char_from_file(str->file_pointer);
+ if(ch == -1)
+ {
+ buf[foo] = 0;
+ return foo - 1;
+ }
+ str->read_count++;
+ if(is_unicode_newline(ch, str->file_pointer, FALSE))
+ {
+ buf[foo] = ch; /* Preserve newline types??? */
+ buf[foo + 1] = 0;
+ return foo;
+ }
+ buf[foo] = ch;
+ }
+ buf[len] = 0;
+ return foo;
+ }
+ else /* Regular binary file */
+ {
+ gchar *readbuffer = g_new0(gchar, len);
+ fgets(readbuffer, len, str->file_pointer);
+ glui32 count = strlen(readbuffer) + 1; /* Copy terminator */
+ int foo;
+ for(foo = 0; foo < count; foo++)
+ buf[foo] = (unsigned char)(readbuffer[foo]);
+ str->read_count += count;
+ return count;
+ }
+ }
+ else /* Text mode is the same for Unicode and regular files */
+ {
+ /* Do it character-by-character */
+ int foo;
+ for(foo = 0; foo < len - 1; foo++)
+ {
+ glsi32 ch = read_utf8_char_from_file(str->file_pointer);
+ if(ch == -1)
+ {
+ buf[foo] = 0;
+ return foo - 1;
+ }
+ str->read_count++;
+ if(is_unicode_newline(ch, str->file_pointer, TRUE))
+ {
+ buf[foo] = ch; /* Preserve newline types??? */
+ buf[foo + 1] = 0;
+ return foo;
+ }
+ buf[foo] = ch;
+ }
+ buf[len] = 0;
+ return foo;
+ }
+ default:
+ ILLEGAL_PARAM("Reading illegal on stream type: %u", str->type);
+ return 0;
+ }
+}
+
+/*
+ *
+ **************** SEEKING FUNCTIONS ********************************************
+ *
+ */
+
+/**
+ * glk_stream_get_position:
+ * @str: A file or memory stream.
+ *
+ * Returns the position of the read/write mark in @str. For memory streams and
+ * binary file streams, this is exactly the number of characters read or written
+ * from the beginning of the stream (unless you have moved the mark with
+ * glk_stream_set_position().) For text file streams, matters are more
+ * ambiguous, since (for example) writing one byte to a text file may store more
+ * than one character in the platform's native encoding. You can only be sure
+ * that the position increases as you read or write to the file.
+ *
+ * Additional complication: for Latin-1 memory and file streams, a character is
+ * a byte. For Unicode memory and file streams (those created by
+ * glk_stream_open_file_uni() and glk_stream_open_memory_uni()), a character is
+ * a 32-bit word. So in a binary Unicode file, positions are multiples of four
+ * bytes.
+ *
+ * <note><para>
+ * If this bothers you, don't use binary Unicode files. I don't think they're
+ * good for much anyhow.
+ * </para></note>
+ *
+ * Returns: position of the read/write mark in @str.
+ */
+glui32
+glk_stream_get_position(strid_t str)
+{
+ VALID_STREAM(str, return 0);
+
+ switch(str->type)
+ {
+ case STREAM_TYPE_MEMORY:
+ return str->mark;
+ case STREAM_TYPE_FILE:
+ return ftell(str->file_pointer);
+ default:
+ ILLEGAL_PARAM("Seeking illegal on stream type: %u", str->type);
+ return 0;
+ }
+}
+
+/**
+ * glk_stream_set_position:
+ * @str: A file or memory stream.
+ * @pos: The position to set the mark to, relative to @seekmode.
+ * @seekmode: One of #seekmode_Start, #seekmode_Current, or #seekmode_End.
+ *
+ * Sets the position of the read/write mark in @str. The position is controlled
+ * by @pos, and the meaning of @pos is controlled by @seekmode. See the
+ * <code>seekmode_</code> constants below.
+ *
+ * It is illegal to specify a position before the beginning or after the end of
+ * the file.
+ *
+ * In binary files, the mark position is exact — it corresponds with the
+ * number of characters you have read or written. In text files, this mapping
+ * can vary, because of linefeed conventions or other character-set
+ * approximations. See <link linkend="chimara-Streams">Streams</link>.
+ * glk_stream_set_position() and glk_stream_get_position() measure positions in
+ * the platform's native encoding — after character cookery. Therefore,
+ * in a text stream, it is safest to use glk_stream_set_position() only to move
+ * to the beginning or end of a file, or to a position determined by
+ * glk_stream_get_position().
+ *
+ * Again, in Latin-1 streams, characters are bytes. In Unicode streams,
+ * characters are 32-bit words, or four bytes each.
+ */
+void
+glk_stream_set_position(strid_t str, glsi32 pos, glui32 seekmode)
+{
+ VALID_STREAM(str, return);
+ g_return_if_fail(!(seekmode == seekmode_Start && pos < 0));
+ g_return_if_fail(!(seekmode == seekmode_End || pos > 0));
+
+ switch(str->type)
+ {
+ case STREAM_TYPE_MEMORY:
+ switch(seekmode)
+ {
+ case seekmode_Start: str->mark = pos; break;
+ case seekmode_Current: str->mark += pos; break;
+ case seekmode_End: str->mark = str->buflen + pos; break;
+ default:
+ g_return_if_reached();
+ return;
+ }
+ break;
+ case STREAM_TYPE_FILE:
+ {
+ int whence;
+ switch(seekmode)
+ {
+ case seekmode_Start: whence = SEEK_SET; break;
+ case seekmode_Current: whence = SEEK_CUR; break;
+ case seekmode_End: whence = SEEK_END; break;
+ default:
+ g_return_if_reached();
+ return;
+ }
+ if(fseek(str->file_pointer, pos, whence) == -1)
+ WARNING("Seek failed on file stream");
+ break;
+ }
+ default:
+ ILLEGAL_PARAM("Seeking illegal on stream type: %u", str->type);
+ return;
+ }
+}
+