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Make the 'struct video' contain an array of unicode characters rather than bytes

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This is disgusting.  And quite frankly, it's debatable whether this will
ever work.  The "line" structure is still just an array of characters,
so that has to work with utf-8.

But the 'struct video' thing is what represents the actual screen
rectangle, and is fixed-size by the size of the screen.  So making it
contain actual 32-bit unicode characters *may* make sense.

Right now we translate things the same way we always used to, though, so
utf-8 in 'struct line' will not be translated to the proper unicode
array, but to the bytes of the utf-8 representation.  So this really
doesn't improve anything per se yet, just expands the memory use of the
video array.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2012-07-10 14:24:23 -07:00
parent 2dddd4f970
commit e8f984a1b0
2 changed files with 40 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
display.c
View File

@ -20,6 +20,8 @@
#include "version.h"
#include "wrapper.h"
typedef unsigned int unicode_t;
struct video {
int v_flag; /* Flags */
#if COLOR
@ -28,7 +30,7 @@ struct video {
int v_rfcolor; /* requested forground color */
int v_rbcolor; /* requested background color */
#endif
char v_text[1]; /* Screen data. */
unicode_t v_text[1]; /* Screen data. */
};
#define VFCHG 0x0001 /* Changed flag */
@ -58,7 +60,7 @@ static void updall(struct window *wp);
static int scrolls(int inserts);
static void scrscroll(int from, int to, int count);
static int texttest(int vrow, int prow);
static int endofline(char *s, int n);
static int endofline(unicode_t *s, int n);
static void updext(void);
static int updateline(int row, struct video *vp1, struct video *vp2);
static void modeline(struct window *wp);
@ -92,7 +94,7 @@ void vtinit(void)
pscreen = xmalloc(term.t_mrow * sizeof(struct video *));
#endif
for (i = 0; i < term.t_mrow; ++i) {
vp = xmalloc(sizeof(struct video) + term.t_mcol);
vp = xmalloc(sizeof(struct video) + term.t_mcol*4);
vp->v_flag = 0;
#if COLOR
vp->v_rfcolor = 7;
@ -100,7 +102,7 @@ void vtinit(void)
#endif
vscreen[i] = vp;
#if MEMMAP == 0 || SCROLLCODE
vp = xmalloc(sizeof(struct video) + term.t_mcol);
vp = xmalloc(sizeof(struct video) + term.t_mcol*4);
vp->v_flag = 0;
pscreen[i] = vp;
#endif
@ -214,7 +216,7 @@ static void vtputc(unsigned char c)
static void vteeol(void)
{
/* struct video *vp; */
char *vcp = vscreen[vtrow]->v_text;
unicode_t *vcp = vscreen[vtrow]->v_text;
/* vp = vscreen[vtrow]; */
while (vtcol < term.t_ncol)
@ -593,7 +595,7 @@ void upddex(void)
*/
void updgar(void)
{
char *txt;
unicode_t *txt;
int i, j;
for (i = 0; i < term.t_nrow; ++i) {
@ -700,7 +702,7 @@ static int scrolls(int inserts)
end = endofline(vpv->v_text, cols);
if (end == 0)
target = first; /* newlines */
else if (strncmp(vpp->v_text, vpv->v_text, end) == 0)
else if (memcmp(vpp->v_text, vpv->v_text, 4*end) == 0)
target = first + 1; /* broken line newlines */
else
target = first;
@ -759,7 +761,7 @@ static int scrolls(int inserts)
for (i = 0; i < count; i++) {
vpp = pscreen[to + i];
vpv = vscreen[to + i];
strncpy(vpp->v_text, vpv->v_text, cols);
memcpy(vpp->v_text, vpv->v_text, 4*cols);
vpp->v_flag = vpv->v_flag; /* XXX */
if (vpp->v_flag & VFREV) {
vpp->v_flag &= ~VFREV;
@ -778,7 +780,7 @@ static int scrolls(int inserts)
}
#if MEMMAP == 0
for (i = from; i < to; i++) {
char *txt;
unicode_t *txt;
txt = pscreen[i]->v_text;
for (j = 0; j < term.t_ncol; ++j)
txt[j] = ' ';
@ -807,13 +809,13 @@ static int texttest(int vrow, int prow)
struct video *vpv = vscreen[vrow]; /* virtual screen image */
struct video *vpp = pscreen[prow]; /* physical screen image */
return !memcmp(vpv->v_text, vpp->v_text, term.t_ncol);
return !memcmp(vpv->v_text, vpp->v_text, 4*term.t_ncol);
}
/*
* return the index of the first blank of trailing whitespace
*/
static int endofline(char *s, int n)
static int endofline(unicode_t *s, int n)
{
int i;
for (i = n - 1; i >= 0; i--)
@ -866,8 +868,8 @@ static void updext(void)
static int updateline(int row, struct video *vp1, struct video *vp2)
{
#if SCROLLCODE
char *cp1;
char *cp2;
unicode_t *cp1;
unicode_t *cp2;
int nch;
cp1 = &vp1->v_text[0];
@ -908,8 +910,8 @@ static int updateline(int row, struct video *vp1, struct video *vp2)
#if RAINBOW
/* UPDATELINE specific code for the DEC rainbow 100 micro */
char *cp1;
char *cp2;
unicode_t *cp1;
unicode_t *cp2;
int nch;
/* since we don't know how to make the rainbow do this, turn it off */
@ -930,11 +932,11 @@ static int updateline(int row, struct video *vp1, struct video *vp2)
#else
/* UPDATELINE code for all other versions */
char *cp1;
char *cp2;
char *cp3;
char *cp4;
char *cp5;
unicode_t *cp1;
unicode_t *cp2;
unicode_t *cp3;
unicode_t *cp4;
unicode_t *cp5;
int nbflag; /* non-blanks to the right flag? */
int rev; /* reverse video flag */
int req; /* reverse video request flag */

35
posix.c
View File

@ -120,24 +120,25 @@ void ttclose(void)
*/
int ttputc(int c)
{
/*
* We always represent things in 1 byte, but if we output
* in UTF-8, we may need to expand that into 2 bytes..
*
* Some day we might even be able to handle UTF-8 _content_.
*
* That day is not today.
*/
if (utf8_mode()) {
c &= 0xff;
if (c >= 0x80) {
unsigned char first = (c >> 6) | 0xc0;
fputc(first, stdout);
c = (c & 0x3f) | 0x80;
}
unsigned char utf8[6], *p = utf8+5;
int bytes = 1;
if (c < 0)
return 0;
*p = c;
if (c > 0x7f) {
int prefix = 0x40;
do {
*p = 0x80 + (c & 0x3f);
--p;
bytes++;
prefix >>= 1;
c >>= 6;
} while (c > prefix);
*p = c - 2*prefix;
}
fputc(c, stdout);
return TRUE;
fwrite(p, 1, bytes, stdout);
return 0;
}
/*