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Allow UTF-8 characters of width 0 to be stored, it is useful to be able

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to put padding cells in as width 0.
This commit is contained in:
nicm
2020-06-02 20:10:23 +00:00
parent f5366ff828
commit 2a4d4bda2b
4 changed files with 28 additions and 34 deletions
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4
grid.c
View File

@@ -76,7 +76,7 @@ grid_need_extended_cell(const struct grid_cell_entry *gce,
return (1);
if (gc->attr > 0xff)
return (1);
if (gc->data.size > 1 || gc->data.width > 1)
if (gc->data.size != 1 || gc->data.width != 1)
return (1);
if ((gc->fg & COLOUR_FLAG_RGB) || (gc->bg & COLOUR_FLAG_RGB))
return (1);
@@ -570,7 +570,7 @@ grid_set_cells(struct grid *gd, u_int px, u_int py, const struct grid_cell *gc,
gce = &gl->celldata[px + i];
if (grid_need_extended_cell(gce, gc)) {
gee = grid_extended_cell(gl, gce, gc);
gee->data = utf8_build_one(s[i], 1);
gee->data = utf8_build_one(s[i]);
} else
grid_store_cell(gce, gc, s[i]);
}

2
screen-write.c
View File

@@ -39,7 +39,7 @@ static const struct grid_cell *screen_write_combine(struct screen_write_ctx *,
const struct utf8_data *, u_int *);
static const struct grid_cell screen_write_pad_cell = {
{ { ' ' }, 0, 1, 1 }, 0, GRID_FLAG_PADDING, 8, 8, 0
{ { 0 }, 0, 0, 0 }, 0, GRID_FLAG_PADDING, 8, 8, 0
};
struct screen_write_collect_item {

2
tmux.h
View File

@@ -2902,7 +2902,7 @@ u_int session_group_attached_count(struct session_group *);
void session_renumber_windows(struct session *);
/* utf8.c */
utf8_char utf8_build_one(char, u_int);
utf8_char utf8_build_one(u_char);
enum utf8_state utf8_from_data(const struct utf8_data *, utf8_char *);
void utf8_to_data(utf8_char, struct utf8_data *);
void utf8_set(struct utf8_data *, u_char);

54
utf8.c
View File

@@ -56,19 +56,26 @@ union utf8_map {
utf8_char uc;
struct {
u_char flags;
#define UTF8_FLAG_SIZE 0x1f
#define UTF8_FLAG_WIDTH2 0x20
u_char data[3];
};
} __packed;
#define UTF8_GET_SIZE(flags) ((flags) & 0x1f)
#define UTF8_GET_WIDTH(flags) (((flags) >> 5) - 1)
#define UTF8_SET_SIZE(size) (size)
#define UTF8_SET_WIDTH(width) ((width + 1) << 5)
static const union utf8_map utf8_space0 = {
.flags = UTF8_SET_WIDTH(0)|UTF8_SET_SIZE(0),
.data = ""
};
static const union utf8_map utf8_space1 = {
.flags = 1,
.flags = UTF8_SET_WIDTH(1)|UTF8_SET_SIZE(1),
.data = " "
};
static const union utf8_map utf8_space2 = {
.flags = UTF8_FLAG_WIDTH2|2,
.flags = UTF8_SET_WIDTH(2)|UTF8_SET_SIZE(2),
.data = " "
};
@@ -135,24 +142,12 @@ utf8_from_data(const struct utf8_data *ud, utf8_char *uc)
union utf8_map m = { .uc = 0 };
u_int offset;
if (ud->width == 0)
goto fail;
if (ud->width != 1 && ud->width != 2)
if (ud->width > 2)
fatalx("invalid UTF-8 width");
if (ud->size == 0)
fatalx("invalid UTF-8 size");
if (ud->size > UTF8_FLAG_SIZE)
if (ud->size > UTF8_SIZE)
goto fail;
if (ud->size == 1) {
*uc = utf8_build_one(ud->data[0], 1);
return (UTF8_DONE);
}
m.flags = ud->size;
if (ud->width == 2)
m.flags |= UTF8_FLAG_WIDTH2;
m.flags = UTF8_SET_SIZE(ud->size)|UTF8_SET_WIDTH(ud->width);
if (ud->size <= 3)
memcpy(m.data, ud->data, ud->size);
else {
@@ -166,7 +161,9 @@ utf8_from_data(const struct utf8_data *ud, utf8_char *uc)
return (UTF8_DONE);
fail:
if (ud->width == 1)
if (ud->width == 0)
*uc = htonl(utf8_space0.uc);
else if (ud->width == 1)
*uc = htonl(utf8_space1.uc);
else
*uc = htonl(utf8_space2.uc);
@@ -182,11 +179,8 @@ utf8_to_data(utf8_char uc, struct utf8_data *ud)
u_int offset;
memset(ud, 0, sizeof *ud);
ud->size = ud->have = (m.flags & UTF8_FLAG_SIZE);
if (m.flags & UTF8_FLAG_WIDTH2)
ud->width = 2;
else
ud->width = 1;
ud->size = ud->have = UTF8_GET_SIZE(m.flags);
ud->width = UTF8_GET_WIDTH(m.flags);
if (ud->size <= 3) {
memcpy(ud->data, m.data, ud->size);
@@ -204,12 +198,12 @@ utf8_to_data(utf8_char uc, struct utf8_data *ud)
/* Get UTF-8 character from a single ASCII character. */
u_int
utf8_build_one(char c, u_int width)
utf8_build_one(u_char ch)
{
union utf8_map m = { .flags = 1, .data[0] = c };
union utf8_map m;
if (width == 2)
m.flags |= UTF8_FLAG_WIDTH2;
m.flags = UTF8_SET_SIZE(1)|UTF8_SET_WIDTH(1);
m.data[0] = ch;
return (htonl(m.uc));
}