Use an enum for UTF8 decoder state

kittens/choose/choose-data-types.h

@@ -30,8 +30,6 @@ typedef uint8_t len_t;
 typedef uint32_t text_t;
 
 #define LEN_MAX UINT8_MAX
-#define UTF8_ACCEPT 0
-#define UTF8_REJECT 1
 #define IS_LOWERCASE(x) (x) >= 'a' && (x) <= 'z'
 #define IS_UPPERCASE(x) (x) >= 'A' && (x) <= 'Z'
 #define LOWERCASE(x) ((IS_UPPERCASE(x)) ? (x) + 32 : (x))

kitty/charsets.c

@@ -7,10 +7,8 @@
 
 // Taken from consolemap.c in the linux vt driver sourcecode
 
-#include <stddef.h>
-#include <stdint.h>
-#define UTF8_ACCEPT 0
-#define UTF8_REJECT 1
+#include "data-types.h"
+
 
 static uint32_t charset_translations[5][256] = {
   /* 8-bit Latin-1 mapped to Unicode -- trivial mapping */
@@ -231,7 +229,7 @@ static const uint8_t utf8_data[] = {
 };
 
 uint32_t
-decode_utf8(uint32_t* state, uint32_t* codep, uint8_t byte) {
+decode_utf8(UTF8State* state, uint32_t* codep, uint8_t byte) {
   uint32_t type = utf8_data[byte];
 
   *codep = (*state != UTF8_ACCEPT) ?
@@ -245,7 +243,8 @@ decode_utf8(uint32_t* state, uint32_t* codep, uint8_t byte) {
 size_t
 decode_utf8_string(const char *src, size_t sz, uint32_t *dest) {
     // dest must be a zeroed array of size at least sz
-    uint32_t codep = 0, state = 0, prev = UTF8_ACCEPT;
+    uint32_t codep = 0;
+    UTF8State state = 0, prev = UTF8_ACCEPT;
     size_t i, d;
     for (i = 0, d = 0; i < sz; i++) {
         switch(decode_utf8(&state, &codep, src[i])) {

kitty/data-types.h

@@ -80,8 +80,6 @@ typedef enum { TILING, SCALED, MIRRORED } BackgroundImageLayout;
 #define ATTRS_MASK_FOR_SGR (ATTRS_MASK_WITHOUT_MARK | ATTRS_MASK_WITHOUT_WIDTH)
 #define MARK_MASK 3
 #define COL_MASK 0xFFFFFFFF
-#define UTF8_ACCEPT 0
-#define UTF8_REJECT 1
 #define DECORATION_FG_CODE 58
 #define CHAR_IS_BLANK(ch) ((ch) == 32 || (ch) == 0)
 #define CONTINUED_MASK 1
@@ -153,6 +151,8 @@ typedef enum { TILING, SCALED, MIRRORED } BackgroundImageLayout;
 #endif
 
 
+typedef enum UTF8State { UTF8_ACCEPT = 0, UTF8_REJECT = 1} UTF8State;
+
 typedef struct {
     uint32_t left, top, right, bottom;
 } Region;

kitty/history.c

@@ -196,7 +196,8 @@ static inline bool
 pagerhist_ensure_start_is_valid_utf8(PagerHistoryBuf *ph) {
     uint8_t scratch[8];
     size_t num = ringbuf_memcpy_from(scratch, ph->ringbuf, arraysz(scratch));
-    uint32_t state = UTF8_ACCEPT, codep;
+    uint32_t codep;
+    UTF8State state = UTF8_ACCEPT;
     size_t count = 0;
     size_t last_reject_at = 0;
     while (count < num) {
@@ -333,7 +334,7 @@ get_line(HistoryBuf *self, index_type y, Line *l) { init_line(self, index_of(sel
 
 static inline char_type
 pagerhist_remove_char(PagerHistoryBuf *ph, unsigned *count, uint8_t record[8]) {
-    uint32_t codep, state = UTF8_ACCEPT;
+    uint32_t codep; UTF8State state = UTF8_ACCEPT;
     *count = 0;
     size_t num = ringbuf_bytes_used(ph->ringbuf);
     while (num--) {

kitty/key_encoding.c

@@ -90,7 +90,7 @@ serialize(const EncodingData *data, char *output, const char csi_trailer) {
     }
     if (third_field_not_empty) {
         const char *p = data->text;
-        uint32_t codep, state = UTF8_ACCEPT;
+        uint32_t codep; UTF8State state = UTF8_ACCEPT;
         bool first = true;
         while(*p) {
             if (decode_utf8(&state, &codep, *p) == UTF8_ACCEPT) {
@@ -397,7 +397,7 @@ encode_key(const KeyEvent *ev, char *output) {
 static inline bool
 startswith_ascii_control_char(const char *p) {
     if (!p || !*p) return true;
-    uint32_t codep, state = UTF8_ACCEPT;
+    uint32_t codep; UTF8State state = UTF8_ACCEPT;
     while(*p) {
         if (decode_utf8(&state, &codep, *p) == UTF8_ACCEPT) {
             return codep < 32 || codep == 127;

kitty/screen.c

@@ -622,7 +622,7 @@ screen_draw_overlay_text(Screen *self, const char *utf8_text) {
     self->overlay_line.ynum = self->cursor->y;
     self->overlay_line.xstart = self->cursor->x;
     self->overlay_line.xnum = 0;
-    uint32_t codepoint = 0, state = UTF8_ACCEPT;
+    uint32_t codepoint = 0; UTF8State state = UTF8_ACCEPT;
     bool orig_line_wrap_mode = self->modes.mDECAWM;
     self->modes.mDECAWM = false;
     self->cursor->reverse ^= true;

kitty/screen.h

@@ -83,7 +83,8 @@ typedef struct {
     CellPixelSize cell_size;
     OverlayLine overlay_line;
     id_type window_id;
-    uint32_t utf8_state, utf8_codepoint, *g0_charset, *g1_charset, *g_charset;
+    uint32_t utf8_codepoint, *g0_charset, *g1_charset, *g_charset;
+    UTF8State utf8_state;
     unsigned int current_charset;
     Selections selections, url_ranges;
     struct {