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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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54
utf8.c
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@ -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));
}