Added more abstract terminal functions, refactored away use of guac_send_* in terminial handlers, simplified code.

protocols/ssh/include/ssh_terminal.h

@@ -79,5 +79,18 @@ void ssh_guac_terminal_free(ssh_guac_terminal* term);
 int ssh_guac_terminal_write(ssh_guac_terminal* term, const char* c, int size);
 int ssh_guac_terminal_send_glyph(ssh_guac_terminal* term, int row, int col, char c);
 
+int ssh_guac_terminal_copy(ssh_guac_terminal* term,
+        int src_row, int src_col, int rows, int cols,
+        int dst_row, int dst_col);
+int ssh_guac_terminal_clear(ssh_guac_terminal* term,
+        int row, int col, int rows, int cols);
+
+int ssh_guac_terminal_scroll_up(ssh_guac_terminal* term,
+        int start_row, int end_row, int amount);
+
+int ssh_guac_terminal_clear_range(ssh_guac_terminal* term,
+        int start_row, int start_col,
+        int end_row, int end_col);
+
 #endif
 

protocols/ssh/src/ssh_terminal.c

@@ -173,3 +173,102 @@ int ssh_guac_terminal_write(ssh_guac_terminal* term, const char* c, int size) {
 
 }
 
+int ssh_guac_terminal_copy(ssh_guac_terminal* term,
+        int src_row, int src_col, int rows, int cols,
+        int dst_row, int dst_col) {
+
+    GUACIO* io = term->client->io;
+
+    /* Send copy instruction */
+    return guac_send_copy(io,
+
+            GUAC_DEFAULT_LAYER,
+            src_col * term->char_width, src_row * term->char_height,
+            cols    * term->char_width, rows    * term->char_height,
+
+            GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
+            dst_col * term->char_width, dst_row * term->char_height);
+
+}
+
+
+int ssh_guac_terminal_clear(ssh_guac_terminal* term,
+        int row, int col, int rows, int cols) {
+
+    GUACIO* io = term->client->io;
+
+    /* Fill with background */
+    return guac_send_rect(io,
+            GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
+
+            col  * term->char_width, row  * term->char_height,
+            cols * term->char_width, rows * term->char_height,
+
+            /* Background */
+            0, 0, 0, 255);
+
+}
+
+int ssh_guac_terminal_scroll_up(ssh_guac_terminal* term,
+        int start_row, int end_row, int amount) {
+
+    /* Calculate height of scroll region */
+    int height = end_row - start_row + 1;
+
+    return 
+
+        /* Move rows within scroll region up by the given amount */
+        ssh_guac_terminal_copy(term,
+                start_row + amount, 0,
+                height - amount, term->term_width,
+                start_row, 0)
+
+        /* Fill new rows with background */
+        || ssh_guac_terminal_clear(term,
+                end_row - amount + 1, 0, amount, term->term_width);
+
+}
+
+
+int ssh_guac_terminal_clear_range(ssh_guac_terminal* term,
+        int start_row, int start_col,
+        int end_row, int end_col) {
+
+    /* If not at far left, must clear sub-region to far right */
+    if (start_col > 0) {
+
+        /* Clear from start_col to far right */
+        if (ssh_guac_terminal_clear(term,
+                start_row, start_col, 1, term->term_width - start_col))
+            return 1;
+
+        /* One less row to clear */
+        start_row++;
+    }
+
+    /* If not at far right, must clear sub-region to far left */
+    if (end_col < term->term_width - 1) {
+
+        /* Clear from far left to end_col */
+        if (ssh_guac_terminal_clear(term,
+                end_row, 0, 1, end_col + 1))
+            return 1;
+
+        /* One less row to clear */
+        end_row--;
+
+    }
+
+    /* Remaining region now guaranteed rectangular. Clear, if possible */
+    if (start_row <= end_row) {
+
+        if (ssh_guac_terminal_clear(term,
+                start_row, 0, end_row - start_row + 1, term->term_width))
+            return 1;
+
+    }
+
+    return 0;
+
+}
+

protocols/ssh/src/ssh_terminal_handlers.c

@@ -42,17 +42,12 @@
 #include <pango/pangocairo.h>
 
 #include <guacamole/log.h>
-#include <guacamole/guacio.h>
-#include <guacamole/protocol.h>
-#include <guacamole/client.h>
 
 #include "ssh_terminal.h"
 #include "ssh_terminal_handlers.h"
 
 int ssh_guac_terminal_echo(ssh_guac_terminal* term, char c) {
 
-    GUACIO* io = term->client->io;
-
     /* Wrap if necessary */
     if (term->cursor_col >= term->term_width) {
         term->cursor_col = 0;
@@ -63,20 +58,8 @@ int ssh_guac_terminal_echo(ssh_guac_terminal* term, char c) {
     if (term->cursor_row >= term->term_height) {
         term->cursor_row = term->term_height - 1;
 
-        /* Copy screen up by one row */
+        /* Scroll up by one row */        
-        guac_send_copy(io,
+        ssh_guac_terminal_scroll_up(term, 0, term->term_height - 1, 1);
-                GUAC_DEFAULT_LAYER, 0, term->char_height,
-                term->char_width * term->term_width,
-                term->char_height * (term->term_height - 1),
-                GUAC_COMP_SRC, GUAC_DEFAULT_LAYER, 0, 0);
-
-        /* Fill bottom row with background */
-        guac_send_rect(io,
-                GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
-                0, term->char_height * (term->term_height - 1),
-                term->char_width * term->term_width,
-                term->char_height * term->term_height,
-                0, 0, 0, 255);
 
     }
 
@@ -155,8 +138,6 @@ int ssh_guac_terminal_charset(ssh_guac_terminal* term, char c) {
 
 int ssh_guac_terminal_csi(ssh_guac_terminal* term, char c) {
 
-    GUACIO* io = term->client->io;
-
     /* CSI function arguments */
     static int argc = 0;
     static int argv[16];
@@ -206,65 +187,21 @@ int ssh_guac_terminal_csi(ssh_guac_terminal* term, char c) {
             case 'J':
  
                 /* Erase from cursor to end of display */
-                if (argv[0] == 0) {
+                if (argv[0] == 0)
-
+                    ssh_guac_terminal_clear_range(term,
-                    /* Until end of line */
+                            term->cursor_row, term->cursor_col,
-                    guac_send_rect(io,
+                            term->term_height-1, term->term_width-1);
-                            GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
-                            term->cursor_col * term->char_width,
-                            term->cursor_row * term->char_height,
-                            (term->term_width - term->cursor_col) * term->char_width,
-                            term->char_height,
-                            0, 0, 0, 255); /* Background color */
-
-                    /* Until end of display */
-                    if (term->cursor_row < term->term_height - 1) {
-                        guac_send_rect(io,
-                                GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
-                                0,
-                                (term->cursor_row+1) * term->char_height,
-                                term->term_width * term->char_width,
-                                term->term_height * term->char_height,
-                                0, 0, 0, 255); /* Background color */
-                    }
-
-                }
                 
                 /* Erase from start to cursor */
-                else if (argv[0] == 1) {
+                else if (argv[0] == 1)
-
+                    ssh_guac_terminal_clear_range(term,
-                    /* Until start of line */
+                            0, 0,
-                    guac_send_rect(io,
+                            term->cursor_row, term->cursor_col);
-                            GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
-                            0,
-                            term->cursor_row * term->char_height,
-                            term->cursor_col * term->char_width,
-                            term->char_height,
-                            0, 0, 0, 255); /* Background color */
-
-                    /* From start */
-                    if (term->cursor_row >= 1) {
-                        guac_send_rect(io,
-                                GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
-                                0,
-                                0,
-                                term->term_width * term->char_width,
-                                (term->cursor_row-1) * term->char_height,
-                                0, 0, 0, 255); /* Background color */
-                    }
-
-                }
 
                 /* Entire screen */
-                else if (argv[0] == 2) {
+                else if (argv[0] == 2)
-                    guac_send_rect(io,
+                    ssh_guac_terminal_clear(term,
-                            GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
+                            0, 0, term->term_height, term->term_width);
-                            0,
-                            0,
-                            term->term_width * term->char_width,
-                            term->term_height * term->char_height,
-                            0, 0, 0, 255); /* Background color */
-                }
 
                 break;
 
@@ -272,37 +209,22 @@ int ssh_guac_terminal_csi(ssh_guac_terminal* term, char c) {
             case 'K':
 
                 /* Erase from cursor to end of line */
-                if (argv[0] == 0) {
+                if (argv[0] == 0)
-                    guac_send_rect(io,
+                    ssh_guac_terminal_clear(term,
-                            GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
+                            term->cursor_row, term->cursor_col,
-                            term->cursor_col * term->char_width,
+                            1, term->term_width - term->cursor_col);
-                            term->cursor_row * term->char_height,
-                            (term->term_width - term->cursor_col) * term->char_width,
-                            term->char_height,
-                            0, 0, 0, 255); /* Background color */
-                }
 
                 /* Erase from start to cursor */
-                else if (argv[0] == 1) {
+                else if (argv[0] == 1)
-                    guac_send_rect(io,
+                    ssh_guac_terminal_clear(term,
-                            GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
+                            term->cursor_row, 0,
-                            0,
+                            1, term->cursor_col + 1);
-                            term->cursor_row * term->char_height,
-                            term->cursor_col * term->char_width,
-                            term->char_height,
-                            0, 0, 0, 255); /* Background color */
-                }
 
                 /* Erase line */
-                else if (argv[0] == 2) {
+                else if (argv[0] == 2)
-                    guac_send_rect(io,
+                    ssh_guac_terminal_clear(term,
-                            GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
+                            term->cursor_row, 0,
-                            0,
+                            1, term->term_width);
-                            term->cursor_row * term->char_height,
-                            term->term_width * term->char_width,
-                            term->char_height,
-                            0, 0, 0, 255); /* Background color */
-                }
 
                 break;