[patch 1/3] speakup: extend synth buffer to 16bit unicode characters

[Samuel Thibault]

This extends the synth buffer slots to 16bit, so as to hold 16bit
unicode characters.

synth_buffer_getc and synth_buffer_peek now return 16bit characters.
Speech synthesizers which do not support characters beyond latin1 can
use the synth_buffer_skip_nonlatin1() helper to skip the non-latin1
characters before getting or peeking. All synthesizers are made to use
it for now.

This makes synth_buffer_add take a 16bit character. For simplicity for
now, synth_printf is left to using latin1 formats and strings.
synth_putwc, synth_putwc_s, synth_putws and synth_putws_s helpers are
however added to put 16bit characters and strings.

Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
Reviewed-by: Chris Brannon <chris@xxxxxxxxxxxxxxxx>

Index: linux-4.10/drivers/staging/speakup/spk_priv.h
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/spk_priv.h
+++ linux-4.10/drivers/staging/speakup/spk_priv.h
@@ -48,8 +48,9 @@ unsigned char spk_serial_in_nowait(void)
 int spk_serial_out(const char ch);
 void spk_serial_release(void);
 
-char synth_buffer_getc(void);
-char synth_buffer_peek(void);
+void synth_buffer_skip_nonlatin1(void);
+u16 synth_buffer_getc(void);
+u16 synth_buffer_peek(void);
 int synth_buffer_empty(void);
 struct var_t *spk_get_var(enum var_id_t var_id);
 ssize_t spk_var_show(struct kobject *kobj, struct kobj_attribute *attr,
@@ -64,6 +65,10 @@ void spk_synth_flush(struct spk_synth *s
 int spk_synth_is_alive_nop(struct spk_synth *synth);
 int spk_synth_is_alive_restart(struct spk_synth *synth);
 void synth_printf(const char *buf, ...);
+void synth_putwc(u16 wc);
+void synth_putwc_s(u16 wc);
+void synth_putws(const u16 *buf);
+void synth_putws_s(const u16 *buf);
 int synth_request_region(u_long, u_long);
 int synth_release_region(u_long, u_long);
 int synth_add(struct spk_synth *in_synth);
Index: linux-4.10/drivers/staging/speakup/speakup.h
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/speakup.h
+++ linux-4.10/drivers/staging/speakup/speakup.h
@@ -70,7 +70,7 @@ void synth_release(void);
 
 void spk_do_flush(void);
 void speakup_start_ttys(void);
-void synth_buffer_add(char ch);
+void synth_buffer_add(u16 ch);
 void synth_buffer_clear(void);
 void speakup_clear_selection(void);
 int speakup_set_selection(struct tty_struct *tty);
Index: linux-4.10/drivers/staging/speakup/synth.c
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/synth.c
+++ linux-4.10/drivers/staging/speakup/synth.c
@@ -109,6 +109,7 @@ void spk_do_catch_up(struct spk_synth *s
 			synth->flush(synth);
 			continue;
 		}
+		synth_buffer_skip_nonlatin1();
 		if (synth_buffer_empty()) {
 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 			break;
@@ -255,6 +256,35 @@ void synth_printf(const char *fmt, ...)
 }
 EXPORT_SYMBOL_GPL(synth_printf);
 
+void synth_putwc(u16 wc)
+{
+	synth_buffer_add(wc);
+}
+EXPORT_SYMBOL_GPL(synth_putwc);
+
+void synth_putwc_s(u16 wc)
+{
+	synth_buffer_add(wc);
+	synth_start();
+}
+EXPORT_SYMBOL_GPL(synth_putwc_s);
+
+void synth_putws(const u16 *buf)
+{
+	const u16 *p;
+
+	for (p = buf; *p; p++)
+		synth_buffer_add(*p);
+}
+EXPORT_SYMBOL_GPL(synth_putws);
+
+void synth_putws_s(const u16 *buf)
+{
+	synth_putws(buf);
+	synth_start();
+}
+EXPORT_SYMBOL_GPL(synth_putws_s);
+
 static int index_count;
 static int sentence_count;
 
Index: linux-4.10/drivers/staging/speakup/buffers.c
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/buffers.c
+++ linux-4.10/drivers/staging/speakup/buffers.c
@@ -7,10 +7,10 @@
 
 #define SYNTH_BUF_SIZE 8192	/* currently 8K bytes */
 
-static u_char synth_buffer[SYNTH_BUF_SIZE];	/* guess what this is for! */
-static u_char *buff_in = synth_buffer;
-static u_char *buff_out = synth_buffer;
-static u_char *buffer_end = synth_buffer + SYNTH_BUF_SIZE - 1;
+static u16 synth_buffer[SYNTH_BUF_SIZE];	/* guess what this is for! */
+static u16 *buff_in = synth_buffer;
+static u16 *buff_out = synth_buffer;
+static u16 *buffer_end = synth_buffer + SYNTH_BUF_SIZE - 1;
 
 /* These try to throttle applications by stopping the TTYs
  * Note: we need to make sure that we will restart them eventually, which is
@@ -44,13 +44,13 @@ static void speakup_stop_ttys(void)
 
 static int synth_buffer_free(void)
 {
-	int bytes_free;
+	int chars_free;
 
 	if (buff_in >= buff_out)
-		bytes_free = SYNTH_BUF_SIZE - (buff_in - buff_out);
+		chars_free = SYNTH_BUF_SIZE - (buff_in - buff_out);
 	else
-		bytes_free = buff_out - buff_in;
-	return bytes_free;
+		chars_free = buff_out - buff_in;
+	return chars_free;
 }
 
 int synth_buffer_empty(void)
@@ -59,7 +59,7 @@ int synth_buffer_empty(void)
 }
 EXPORT_SYMBOL_GPL(synth_buffer_empty);
 
-void synth_buffer_add(char ch)
+void synth_buffer_add(u16 ch)
 {
 	if (!synth->alive) {
 		/* This makes sure that we won't stop TTYs if there is no synth
@@ -78,9 +78,9 @@ void synth_buffer_add(char ch)
 		buff_in = synth_buffer;
 }
 
-char synth_buffer_getc(void)
+u16 synth_buffer_getc(void)
 {
-	char ch;
+	u16 ch;
 
 	if (buff_out == buff_in)
 		return 0;
@@ -91,7 +91,7 @@ char synth_buffer_getc(void)
 }
 EXPORT_SYMBOL_GPL(synth_buffer_getc);
 
-char synth_buffer_peek(void)
+u16 synth_buffer_peek(void)
 {
 	if (buff_out == buff_in)
 		return 0;
@@ -99,6 +99,18 @@ char synth_buffer_peek(void)
 }
 EXPORT_SYMBOL_GPL(synth_buffer_peek);
 
+void synth_buffer_skip_nonlatin1(void)
+{
+	while (buff_out != buff_in) {
+		if (*buff_out < 0x100)
+			return;
+		buff_out++;
+		if (buff_out > buffer_end)
+			buff_out = synth_buffer;
+	}
+}
+EXPORT_SYMBOL_GPL(synth_buffer_skip_nonlatin1);
+
 void synth_buffer_clear(void)
 {
 	buff_in = synth_buffer;
Index: linux-4.10/drivers/staging/speakup/speakup_acntpc.c
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/speakup_acntpc.c
+++ linux-4.10/drivers/staging/speakup/speakup_acntpc.c
@@ -196,6 +196,7 @@ static void do_catch_up(struct spk_synth
 			synth->flush(synth);
 			continue;
 		}
+		synth_buffer_skip_nonlatin1();
 		if (synth_buffer_empty()) {
 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 			break;
Index: linux-4.10/drivers/staging/speakup/speakup_apollo.c
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/speakup_apollo.c
+++ linux-4.10/drivers/staging/speakup/speakup_apollo.c
@@ -160,6 +160,7 @@ static void do_catch_up(struct spk_synth
 			synth->flush(synth);
 			continue;
 		}
+		synth_buffer_skip_nonlatin1();
 		if (synth_buffer_empty()) {
 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 			break;
Index: linux-4.10/drivers/staging/speakup/speakup_decext.c
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/speakup_decext.c
+++ linux-4.10/drivers/staging/speakup/speakup_decext.c
@@ -175,6 +175,7 @@ static void do_catch_up(struct spk_synth
 			synth->flush(synth);
 			continue;
 		}
+		synth_buffer_skip_nonlatin1();
 		if (synth_buffer_empty()) {
 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 			break;
Index: linux-4.10/drivers/staging/speakup/speakup_decpc.c
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/speakup_decpc.c
+++ linux-4.10/drivers/staging/speakup/speakup_decpc.c
@@ -392,6 +392,7 @@ static void do_catch_up(struct spk_synth
 			synth->flush(synth);
 			continue;
 		}
+		synth_buffer_skip_nonlatin1();
 		if (synth_buffer_empty()) {
 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 			break;
Index: linux-4.10/drivers/staging/speakup/speakup_dectlk.c
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/speakup_dectlk.c
+++ linux-4.10/drivers/staging/speakup/speakup_dectlk.c
@@ -239,6 +239,7 @@ static void do_catch_up(struct spk_synth
 			synth->flush(synth);
 			continue;
 		}
+		synth_buffer_skip_nonlatin1();
 		if (synth_buffer_empty()) {
 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 			break;
Index: linux-4.10/drivers/staging/speakup/speakup_dtlk.c
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/speakup_dtlk.c
+++ linux-4.10/drivers/staging/speakup/speakup_dtlk.c
@@ -209,6 +209,7 @@ static void do_catch_up(struct spk_synth
 			synth->flush(synth);
 			continue;
 		}
+		synth_buffer_skip_nonlatin1();
 		if (synth_buffer_empty()) {
 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 			break;
Index: linux-4.10/drivers/staging/speakup/speakup_keypc.c
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/speakup_keypc.c
+++ linux-4.10/drivers/staging/speakup/speakup_keypc.c
@@ -198,6 +198,7 @@ spin_lock_irqsave(&speakup_info.spinlock
 			synth->flush(synth);
 			continue;
 		}
+		synth_buffer_skip_nonlatin1();
 		if (synth_buffer_empty()) {
 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
 			break;
Index: linux-4.10/drivers/staging/speakup/speakup_soft.c
===================================================================
--- linux-4.10.orig/drivers/staging/speakup/speakup_soft.c
+++ linux-4.10/drivers/staging/speakup/speakup_soft.c
@@ -213,6 +213,7 @@ static ssize_t softsynth_read(struct fil
 	spin_lock_irqsave(&speakup_info.spinlock, flags);
 	while (1) {
 		prepare_to_wait(&speakup_event, &wait, TASK_INTERRUPTIBLE);
+		synth_buffer_skip_nonlatin1();
 		if (!synth_buffer_empty() || speakup_info.flushing)
 			break;
 		spin_unlock_irqrestore(&speakup_info.spinlock, flags);