Changeset 2568c94 in mainline for uspace/lib/c

Timestamp:

2012-08-17T17:15:19Z (13 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

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

Children:

1789023

Parents:

4f351432 (diff), 01e397ac (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

merge mainline changes

Location:

uspace/lib/c

Files:

• Makefile (modified) (1 diff)
• generic/io/input.c (added)
• generic/str.c (modified) (1 diff)
• include/io/console.h (modified) (2 diffs)
• include/io/input.h (added)
• include/io/kbd_event.h (added)
• include/str.h (modified) (1 diff)

uspace/lib/c/Makefile

@@ -96 +96 @@
         generic/inetping.c \
         generic/io/asprintf.c \
+        generic/io/input.c \
         generic/io/io.c \
         generic/io/chargrid.c \

uspace/lib/c/generic/str.c

@@ -134 +134 @@
         
         return ch;
+}
+
+/** Decode a single character from a string to the left.
+ *
+ * Decode a single character from a string of size @a size. Decoding starts
+ * at @a offset and this offset is moved to the beginning of the previous
+ * character. In case of decoding error, offset generally decreases at least
+ * by one. However, offset is never moved before 0.
+ *
+ * @param str    String (not necessarily NULL-terminated).
+ * @param offset Byte offset in string where to start decoding.
+ * @param size   Size of the string (in bytes).
+ *
+ * @return Value of decoded character, U_SPECIAL on decoding error or
+ *         NULL if attempt to decode beyond @a start of str.
+ *
+ */
+wchar_t str_decode_reverse(const char *str, size_t *offset, size_t size)
+{
+        if (*offset == 0)
+                return 0;
+        
+        size_t processed = 0;
+        /* Continue while continuation bytes found */
+        while (*offset > 0 && processed < 4) {
+                uint8_t b = (uint8_t) str[--(*offset)];
+                
+                if (processed == 0 && (b & 0x80) == 0) {
+                        /* 0xxxxxxx (Plain ASCII) */
+                        return b & 0x7f;
+                }
+                else if ((b & 0xe0) == 0xc0 || (b & 0xf0) == 0xe0 ||
+                    (b & 0xf8) == 0xf0) {
+                        /* Start byte */
+                        size_t start_offset = *offset;
+                        return str_decode(str, &start_offset, size);
+                }
+                else if ((b & 0xc0) != 0x80) {
+                        /* Not a continuation byte */
+                        return U_SPECIAL;
+                }
+                processed++;
+        }
+        /* Too many continuation bytes */
+        return U_SPECIAL;
 }
 

uspace/lib/c/include/io/console.h

@@ -37 +37 @@
 
 #include <sys/time.h>
+#include <io/kbd_event.h>
 #include <io/keycode.h>
 #include <async.h>
@@ -70 +71 @@
 } console_ctrl_t;
 
-typedef enum {
-        KEY_PRESS,
-        KEY_RELEASE
-} kbd_event_type_t;
-
-/** Console event structure. */
-typedef struct {
-        /** List handle */
-        link_t link;
-        
-        /** Press or release event. */
-        kbd_event_type_t type;
-        
-        /** Keycode of the key that was pressed or released. */
-        keycode_t key;
-        
-        /** Bitmask of modifiers held. */
-        keymod_t mods;
-        
-        /** The character that was generated or '\0' for none. */
-        wchar_t c;
-} kbd_event_t;
-
 extern console_ctrl_t *console_init(FILE *, FILE *);
 extern void console_done(console_ctrl_t *);

uspace/lib/c/include/str.h

@@ -56 +56 @@
 
 extern wchar_t str_decode(const char *str, size_t *offset, size_t sz);
+extern wchar_t str_decode_reverse(const char *str, size_t *offset, size_t sz);
 extern int chr_encode(const wchar_t ch, char *str, size_t *offset, size_t sz);