Changeset 19528516 in mainline for uspace/app/bdsh/input.c

Timestamp:

2009-11-29T00:42:51Z (14 years ago)

Author:

jirka <jirka@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

025759c, a1622091

Parents:

2e07d27e

Message:

Rewrite command-line input routine. Adds capability to seek, insert and delete (left/right arrow keys, home, end, delete).

File:

• uspace/app/bdsh/input.c (modified) (3 diffs)

uspace/app/bdsh/input.c

@@ -47 +47 @@
 #include "exec.h"
 
-static void read_line(char *, int);
+typedef struct {
+        wchar_t buffer[INPUT_MAX];
+        int col0, row0;
+        int con_cols, con_rows;
+        int nc;
+        int pos;
+} tinput_t;
+
+typedef enum {
+        seek_cell,
+        seek_max
+} seek_dist_t;
+
+typedef enum {
+        seek_backward = -1,
+        seek_forward = 1
+} seek_dir_t;
+
+static tinput_t tinput;
+
+static char *tinput_read(tinput_t *ti);
 
 /* Tokenizes input from console, sees if the first word is a built-in, if so
@@ -99 +119 @@
 }
 
-static void read_line(char *buffer, int n)
+static void tinput_display_tail(tinput_t *ti, int start, int pad)
+{
+        int i;
+
+        console_goto(fphone(stdout), ti->col0 + start, ti->row0);
+        printf("%ls", ti->buffer + start);
+        for (i = 0; i < pad; ++i)
+                putchar(' ');
+        fflush(stdout);
+}
+
+static void tinput_position_caret(tinput_t *ti)
+{
+        console_goto(fphone(stdout), ti->col0 + ti->pos, ti->row0);
+}
+
+static void tinput_insert_char(tinput_t *ti, wchar_t c)
+{
+        int i;
+
+        if (ti->nc == INPUT_MAX)
+                return;
+
+        if (ti->col0 + ti->nc >= ti->con_cols - 1)
+                return;
+
+        for (i = ti->nc; i > ti->pos; --i)
+                ti->buffer[i] = ti->buffer[i - 1];
+
+        ti->buffer[ti->pos] = c;
+        ti->pos += 1;
+        ti->nc += 1;
+        ti->buffer[ti->nc] = '\0';
+
+        tinput_display_tail(ti, ti->pos - 1, 0);
+        tinput_position_caret(ti);
+}
+
+static void tinput_backspace(tinput_t *ti)
+{
+        int i;
+
+        if (ti->pos == 0)
+                return;
+
+        for (i = ti->pos; i < ti->nc; ++i)
+                ti->buffer[i - 1] = ti->buffer[i];
+        ti->pos -= 1;
+        ti->nc -= 1;
+        ti->buffer[ti->nc] = '\0';
+
+        tinput_display_tail(ti, ti->pos, 1);
+        tinput_position_caret(ti);
+}
+
+static void tinput_delete(tinput_t *ti)
+{
+        if (ti->pos == ti->nc)
+                return;
+
+        ti->pos += 1;
+        tinput_backspace(ti);
+}
+
+static void tinput_seek(tinput_t *ti, seek_dir_t dir, seek_dist_t dist)
+{
+        switch (dist) {
+        case seek_cell:
+                ti->pos += dir;
+                break;
+        case seek_max:
+                if (dir == seek_backward)
+                        ti->pos = 0;
+                else
+                        ti->pos = ti->nc;
+                break;
+        }
+                
+        if (ti->pos < 0) ti->pos = 0;
+        if (ti->pos > ti->nc) ti->pos = ti->nc;
+
+        tinput_position_caret(ti);
+}
+
+static char *tinput_read(tinput_t *ti)
 {
         console_event_t ev;
-        size_t offs, otmp;
-        wchar_t dec;
-
-        offs = 0;
+        char *str;
+
+        fflush(stdout);
+
+        if (console_get_size(fphone(stdin), &ti->con_cols, &ti->con_rows) != EOK)
+                return NULL;
+        if (console_get_pos(fphone(stdin), &ti->col0, &ti->row0) != EOK)
+                return NULL;
+
+        ti->pos = 0;
+        ti->nc = 0;
+
         while (true) {
                 fflush(stdout);
                 if (!console_get_event(fphone(stdin), &ev))
-                        return;
+                        return NULL;
                 
                 if (ev.type != KEY_PRESS)
                         continue;
-                
-                if (ev.key == KC_ENTER || ev.key == KC_NENTER)
-                        break;
-                if (ev.key == KC_BACKSPACE) {
-                        if (offs > 0) {
-                                /*
-                                 * Back up until we reach valid start of
-                                 * character.
-                                 */
-                                while (offs > 0) {
-                                        --offs; otmp = offs;
-                                        dec = str_decode(buffer, &otmp, n);
-                                        if (dec != U_SPECIAL)
-                                                break;
-                                }
-                                putchar('\b');
-                        }
+
+                if ((ev.mods & (KM_CTRL | KM_ALT | KM_SHIFT)) != 0)
                         continue;
+
+                switch(ev.key) {
+                case KC_ENTER:
+                case KC_NENTER:
+                        goto done;
+                case KC_BACKSPACE:
+                        tinput_backspace(ti);
+                        break;
+                case KC_DELETE:
+                        tinput_delete(ti);
+                        break;
+                case KC_LEFT:
+                        tinput_seek(ti, seek_backward, seek_cell);
+                        break;
+                case KC_RIGHT:
+                        tinput_seek(ti, seek_forward, seek_cell);
+
+                        break;
+                case KC_HOME:
+                        tinput_seek(ti, seek_backward, seek_max);
+                        break;
+                case KC_END:
+                        tinput_seek(ti, seek_forward, seek_max);
+                        break;
                 }
                 if (ev.c >= ' ') {
-                        if (chr_encode(ev.c, buffer, &offs, n - 1) == EOK)
-                                putchar(ev.c);
+                        tinput_insert_char(ti, ev.c);
                 }
         }
+
+done:
         putchar('\n');
-        buffer[offs] = '\0';
-}
-
-/* TODO:
- * Implement something like editline() / readline(), if even
- * just for command history and making arrows work. */
+
+        ti->buffer[ti->nc] = '\0';
+        str = malloc(STR_BOUNDS(ti->nc) + 1);
+        if (str == NULL)
+                return NULL;
+
+        wstr_nstr(str, ti->buffer, STR_BOUNDS(ti->nc) + 1);
+
+        return str;
+}
+
 void get_input(cliuser_t *usr)
 {
-        char line[INPUT_MAX];
+        char *str;
 
         fflush(stdout);
@@ -154 +281 @@
         console_set_style(fphone(stdout), STYLE_NORMAL);
 
-        read_line(line, INPUT_MAX);
-        /* Make sure we don't have rubbish or a C/R happy user */
-        if (str_cmp(line, "") == 0 || str_cmp(line, "\n") == 0)
-                return;
-        usr->line = str_dup(line);
-
+        str = tinput_read(&tinput);
+
+        /* Check for empty input. */
+        if (str_cmp(str, "") == 0) {
+                free(str);
+                return;
+        }
+
+        usr->line = str;
         return;
 }
-