static char *get_line(void);
static void print_position(WINDOW * win, int height, int width);
-static int hscroll, fd, file_size, bytes_read;
-static int begin_reached = 1, end_reached, page_length;
-static char *buf, *page;
+static int hscroll;
+static int begin_reached, end_reached, page_length;
+static const char *buf;
+static const char *page;
/*
* Display text from a file in a dialog box.
*/
-int dialog_textbox(const char *title, const char *file, int height, int width)
+int dialog_textbox(const char *title, const char *tbuf, int height, int width)
{
- int i, x, y, cur_x, cur_y, fpos, key = 0;
+ int i, x, y, cur_x, cur_y, key = 0;
+ int texth, textw;
int passed_end;
- char search_term[MAX_LEN + 1];
WINDOW *dialog, *text;
- search_term[0] = '\0'; /* no search term entered yet */
-
- /* Open input file for reading */
- if ((fd = open(file, O_RDONLY)) == -1) {
- endwin();
- fprintf(stderr, "\nCan't open input file in dialog_textbox().\n");
- exit(-1);
- }
- /* Get file size. Actually, 'file_size' is the real file size - 1,
- since it's only the last byte offset from the beginning */
- if ((file_size = lseek(fd, 0, SEEK_END)) == -1) {
- endwin();
- fprintf(stderr, "\nError getting file size in dialog_textbox().\n");
- exit(-1);
- }
- /* Restore file pointer to beginning of file after getting file size */
- if (lseek(fd, 0, SEEK_SET) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
- exit(-1);
- }
- /* Allocate space for read buffer */
- if ((buf = malloc(BUF_SIZE + 1)) == NULL) {
- endwin();
- fprintf(stderr, "\nCan't allocate memory in dialog_textbox().\n");
- exit(-1);
- }
- if ((bytes_read = read(fd, buf, BUF_SIZE)) == -1) {
- endwin();
- fprintf(stderr, "\nError reading file in dialog_textbox().\n");
- exit(-1);
- }
- buf[bytes_read] = '\0'; /* mark end of valid data */
- page = buf; /* page is pointer to start of page to be displayed */
+ begin_reached = 1;
+ end_reached = 0;
+ page_length = 0;
+ hscroll = 0;
+ buf = tbuf;
+ page = buf; /* page is pointer to start of page to be displayed */
/* center dialog box on screen */
x = (COLS - width) / 2;
keypad(dialog, TRUE);
/* Create window for text region, used for scrolling text */
- text = subwin(dialog, height - 4, width - 2, y + 1, x + 1);
+ texth = height - 4;
+ textw = width - 2;
+ text = subwin(dialog, texth, textw, y + 1, x + 1);
wattrset(text, dlg.dialog.atr);
wbkgdset(text, dlg.dialog.atr & A_COLOR);
getyx(dialog, cur_y, cur_x); /* Save cursor position */
/* Print first page of text */
- attr_clear(text, height - 4, width - 2, dlg.dialog.atr);
- print_page(text, height - 4, width - 2);
+ attr_clear(text, texth, textw, dlg.dialog.atr);
+ print_page(text, texth, textw);
print_position(dialog, height, width);
wmove(dialog, cur_y, cur_x); /* Restore cursor position */
wrefresh(dialog);
case 'e':
case 'X':
case 'x':
+ delwin(text);
delwin(dialog);
- free(buf);
- close(fd);
return 0;
case 'g': /* First page */
case KEY_HOME:
if (!begin_reached) {
begin_reached = 1;
- /* First page not in buffer? */
- if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
- exit(-1);
- }
- if (fpos > bytes_read) { /* Yes, we have to read it in */
- if (lseek(fd, 0, SEEK_SET) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer in "
- "dialog_textbox().\n");
- exit(-1);
- }
- if ((bytes_read =
- read(fd, buf, BUF_SIZE)) == -1) {
- endwin();
- fprintf(stderr, "\nError reading file in dialog_textbox().\n");
- exit(-1);
- }
- buf[bytes_read] = '\0';
- }
page = buf;
- print_page(text, height - 4, width - 2);
+ print_page(text, texth, textw);
print_position(dialog, height, width);
wmove(dialog, cur_y, cur_x); /* Restore cursor position */
wrefresh(dialog);
case KEY_END:
end_reached = 1;
- /* Last page not in buffer? */
- if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
- exit(-1);
- }
- if (fpos < file_size) { /* Yes, we have to read it in */
- if (lseek(fd, -BUF_SIZE, SEEK_END) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
- exit(-1);
- }
- if ((bytes_read =
- read(fd, buf, BUF_SIZE)) == -1) {
- endwin();
- fprintf(stderr, "\nError reading file in dialog_textbox().\n");
- exit(-1);
- }
- buf[bytes_read] = '\0';
- }
- page = buf + bytes_read;
- back_lines(height - 4);
- print_page(text, height - 4, width - 2);
+ /* point to last char in buf */
+ page = buf + strlen(buf);
+ back_lines(texth);
+ print_page(text, texth, textw);
print_position(dialog, height, width);
wmove(dialog, cur_y, cur_x); /* Restore cursor position */
wrefresh(dialog);
if (!begin_reached) {
back_lines(page_length + 1);
- /* We don't call print_page() here but use scrolling to ensure
- faster screen update. However, 'end_reached' and
- 'page_length' should still be updated, and 'page' should
- point to start of next page. This is done by calling
- get_line() in the following 'for' loop. */
+ /* We don't call print_page() here but use
+ * scrolling to ensure faster screen update.
+ * However, 'end_reached' and 'page_length'
+ * should still be updated, and 'page' should
+ * point to start of next page. This is done
+ * by calling get_line() in the following
+ * 'for' loop. */
scrollok(text, TRUE);
wscrl(text, -1); /* Scroll text region down one line */
scrollok(text, FALSE);
page_length = 0;
passed_end = 0;
- for (i = 0; i < height - 4; i++) {
+ for (i = 0; i < texth; i++) {
if (!i) {
/* print first line of page */
- print_line(text, 0, width - 2);
+ print_line(text, 0, textw);
wnoutrefresh(text);
} else
/* Called to update 'end_reached' and 'page' */
case KEY_PPAGE:
if (begin_reached)
break;
- back_lines(page_length + height - 4);
- print_page(text, height - 4, width - 2);
+ back_lines(page_length + texth);
+ print_page(text, texth, textw);
print_position(dialog, height, width);
wmove(dialog, cur_y, cur_x);
wrefresh(dialog);
scrollok(text, TRUE);
scroll(text); /* Scroll text region up one line */
scrollok(text, FALSE);
- print_line(text, height - 5, width - 2);
+ print_line(text, texth - 1, textw);
wnoutrefresh(text);
print_position(dialog, height, width);
wmove(dialog, cur_y, cur_x); /* Restore cursor position */
break;
begin_reached = 0;
- print_page(text, height - 4, width - 2);
+ print_page(text, texth, textw);
print_position(dialog, height, width);
wmove(dialog, cur_y, cur_x);
wrefresh(dialog);
hscroll--;
/* Reprint current page to scroll horizontally */
back_lines(page_length);
- print_page(text, height - 4, width - 2);
+ print_page(text, texth, textw);
wmove(dialog, cur_y, cur_x);
wrefresh(dialog);
break;
hscroll++;
/* Reprint current page to scroll horizontally */
back_lines(page_length);
- print_page(text, height - 4, width - 2);
+ print_page(text, texth, textw);
wmove(dialog, cur_y, cur_x);
wrefresh(dialog);
break;
break;
}
}
-
+ delwin(text);
delwin(dialog);
- free(buf);
- close(fd);
- return -1; /* ESC pressed */
+ return 255; /* ESC pressed */
}
/*
- * Go back 'n' lines in text file. Called by dialog_textbox().
+ * Go back 'n' lines in text. Called by dialog_textbox().
* 'page' will be updated to point to the desired line in 'buf'.
*/
static void back_lines(int n)
{
- int i, fpos;
+ int i;
begin_reached = 0;
- /* We have to distinguish between end_reached and !end_reached
- since at end of file, the line is not ended by a '\n'.
- The code inside 'if' basically does a '--page' to move one
- character backward so as to skip '\n' of the previous line */
- if (!end_reached) {
- /* Either beginning of buffer or beginning of file reached? */
- if (page == buf) {
- if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer in "
- "back_lines().\n");
- exit(-1);
- }
- if (fpos > bytes_read) { /* Not beginning of file yet */
- /* We've reached beginning of buffer, but not beginning of
- file yet, so read previous part of file into buffer.
- Note that we only move backward for BUF_SIZE/2 bytes,
- but not BUF_SIZE bytes to avoid re-reading again in
- print_page() later */
- /* Really possible to move backward BUF_SIZE/2 bytes? */
- if (fpos < BUF_SIZE / 2 + bytes_read) {
- /* No, move less then */
- if (lseek(fd, 0, SEEK_SET) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer in "
- "back_lines().\n");
- exit(-1);
- }
- page = buf + fpos - bytes_read;
- } else { /* Move backward BUF_SIZE/2 bytes */
- if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer "
- "in back_lines().\n");
- exit(-1);
- }
- page = buf + BUF_SIZE / 2;
- }
- if ((bytes_read =
- read(fd, buf, BUF_SIZE)) == -1) {
- endwin();
- fprintf(stderr, "\nError reading file in back_lines().\n");
- exit(-1);
- }
- buf[bytes_read] = '\0';
- } else { /* Beginning of file reached */
- begin_reached = 1;
- return;
+ /* Go back 'n' lines */
+ for (i = 0; i < n; i++) {
+ if (*page == '\0') {
+ if (end_reached) {
+ end_reached = 0;
+ continue;
}
}
- if (*(--page) != '\n') { /* '--page' here */
- /* Something's wrong... */
- endwin();
- fprintf(stderr, "\nInternal error in back_lines().\n");
- exit(-1);
+ if (page == buf) {
+ begin_reached = 1;
+ return;
}
- }
- /* Go back 'n' lines */
- for (i = 0; i < n; i++)
+ page--;
do {
if (page == buf) {
- if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer in back_lines().\n");
- exit(-1);
- }
- if (fpos > bytes_read) {
- /* Really possible to move backward BUF_SIZE/2 bytes? */
- if (fpos < BUF_SIZE / 2 + bytes_read) {
- /* No, move less then */
- if (lseek(fd, 0, SEEK_SET) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer "
- "in back_lines().\n");
- exit(-1);
- }
- page = buf + fpos - bytes_read;
- } else { /* Move backward BUF_SIZE/2 bytes */
- if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer"
- " in back_lines().\n");
- exit(-1);
- }
- page = buf + BUF_SIZE / 2;
- }
- if ((bytes_read =
- read(fd, buf, BUF_SIZE)) == -1) {
- endwin();
- fprintf(stderr, "\nError reading file in "
- "back_lines().\n");
- exit(-1);
- }
- buf[bytes_read] = '\0';
- } else { /* Beginning of file reached */
- begin_reached = 1;
- return;
- }
+ begin_reached = 1;
+ return;
}
- } while (*(--page) != '\n');
- page++;
+ page--;
+ } while (*page != '\n');
+ page++;
+ }
}
/*
*/
static char *get_line(void)
{
- int i = 0, fpos;
+ int i = 0;
static char line[MAX_LEN + 1];
end_reached = 0;
while (*page != '\n') {
if (*page == '\0') {
- /* Either end of file or end of buffer reached */
- if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer in "
- "get_line().\n");
- exit(-1);
- }
- if (fpos < file_size) { /* Not end of file yet */
- /* We've reached end of buffer, but not end of file yet,
- so read next part of file into buffer */
- if ((bytes_read =
- read(fd, buf, BUF_SIZE)) == -1) {
- endwin();
- fprintf(stderr, "\nError reading file in get_line().\n");
- exit(-1);
- }
- buf[bytes_read] = '\0';
- page = buf;
- } else {
- if (!end_reached)
- end_reached = 1;
+ if (!end_reached) {
+ end_reached = 1;
break;
}
} else if (i < MAX_LEN)
*/
static void print_position(WINDOW * win, int height, int width)
{
- int fpos, percent;
+ int percent;
- if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
- endwin();
- fprintf(stderr, "\nError moving file pointer in print_position().\n");
- exit(-1);
- }
wattrset(win, dlg.position_indicator.atr);
wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
- percent = !file_size ?
- 100 : ((fpos - bytes_read + page - buf) * 100) / file_size;
+ percent = (page - buf) * 100 / strlen(buf);
wmove(win, height - 3, width - 9);
wprintw(win, "(%3d%%)", percent);
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff