top: adapt utf8 logic to support extra wide characters
Back when top was refactored to support UTF-8 encoding
it was acknowledged that languages like zh_CN were not
supported. That was because a single 'character' might
require more than a single 'column' when it's printed.
Well I've now figured out how to accommodate languages
like that. My adaptation is represented in this patch.
[ and just in case someone wishes to avoid the extra ]
[ runtime costs, a #define OFF_XTRAWIDE is included. ]
Along the way, I've cleaned up some miscellaneous code
supporting the 'Inspect' feature so that the rightmost
screen column was always used rather than being blank.
[ interestingly, my xterm & urxvt terminal emulators ]
[ are able to split extra wide characters then print ]
[ 1/2 of such graphics in the last column. the gnome ]
[ terminal emulator does not duplicate such behavior ]
[ but prints 1 extra character in same width window. ]
Reference(s):
. Sep, 2017 - original utf8 support
commit 7ef38420a4
Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
Craig Small
parent
dfa118b4d5
commit
b4bce3b8fa
57
top/top.c
57
top/top.c
@ -37,6 +37,7 @@
|
||||
#include <termios.h>
|
||||
#include <time.h>
|
||||
#include <unistd.h>
|
||||
#include <wchar.h>
|
||||
|
||||
#include <sys/ioctl.h>
|
||||
#include <sys/resource.h>
|
||||
@ -680,6 +681,24 @@ static char UTF8_tab[] = {
|
||||
}; // ( 0xF5 & beyond invalid )
|
||||
|
||||
|
||||
/*
|
||||
* Accommodate any potential differences between some multibyte
|
||||
* character sequence and the screen columns needed to print it */
|
||||
static inline int utf8_cols (const unsigned char *p, int n) {
|
||||
#ifndef OFF_XTRAWIDE
|
||||
wchar_t wc;
|
||||
int wlen;
|
||||
|
||||
(void)mbtowc(&wc, (const char *)p, n);
|
||||
if ((wlen = wcwidth(wc)) < 1) wlen = 1;
|
||||
return wlen;
|
||||
#else
|
||||
(void)p; (void)n;
|
||||
return 1;
|
||||
#endif
|
||||
} // end: utf8_cols
|
||||
|
||||
|
||||
/*
|
||||
* Determine difference between total bytes versus printable
|
||||
* characters in that passed, potentially multi-byte, string */
|
||||
@ -690,8 +709,8 @@ static int utf8_delta (const char *str) {
|
||||
while (*p) {
|
||||
// -1 represents a decoding error, pretend it's untranslated ...
|
||||
if (0 > (clen = UTF8_tab[*p])) return 0;
|
||||
cnum += utf8_cols(p, clen);
|
||||
p += clen;
|
||||
++cnum;
|
||||
}
|
||||
return (int)((const char *)p - str) - cnum;
|
||||
} // end: utf8_delta
|
||||
@ -708,8 +727,8 @@ static int utf8_embody (const char *str, int width) {
|
||||
while (*p) {
|
||||
// -1 represents a decoding error, pretend it's untranslated ...
|
||||
if (0 > (clen = UTF8_tab[*p])) return width;
|
||||
if (width < (cnum += utf8_cols(p, clen))) break;
|
||||
p += clen;
|
||||
if (++cnum >= width) break;
|
||||
}
|
||||
}
|
||||
return (int)((const char *)p - str);
|
||||
@ -3108,15 +3127,15 @@ static void insp_find_str (int ch, int *col, int *row) {
|
||||
* while visible search matches display with capclr_hdr for emphasis.
|
||||
* ( we hide ugly plumbing in macros to concentrate on the algorithm ) */
|
||||
static void insp_mkrow_raw (int col, int row) {
|
||||
#define maxSZ ( Screen_cols - (to + 1) )
|
||||
#define maxSZ ( Screen_cols - to )
|
||||
#define capNO { if (hicap) { putp(Caps_off); hicap = 0; } }
|
||||
#define mkFND { PUTT("%s%.*s%s", Curwin->capclr_hdr, maxSZ, Insp_sel->fstr, Caps_off); \
|
||||
fr += Insp_sel->flen -1; to += Insp_sel->flen; hicap = 0; }
|
||||
#ifndef INSP_JUSTNOT
|
||||
#define mkCTL { int x = maxSZ; const char *p = fmtmk("^%c", uch + '@'); \
|
||||
PUTT("%s%.*s", (!hicap) ? Curwin->capclr_msg : "", x, p); to += 2; hicap = 1; }
|
||||
#define mkUNP { int x = maxSZ; const char *p = fmtmk("<%02X>", uch); \
|
||||
PUTT("%s%.*s", (!hicap) ? Curwin->capclr_msg : "", x, p); to += 4; hicap = 1; }
|
||||
#define mkCTL { const char *p = fmtmk("^%c", uch + '@'); \
|
||||
PUTT("%s%.*s", (!hicap) ? Curwin->capclr_msg : "", maxSZ, p); to += 2; hicap = 1; }
|
||||
#define mkUNP { const char *p = fmtmk("<%02X>", uch); \
|
||||
PUTT("%s%.*s", (!hicap) ? Curwin->capclr_msg : "", maxSZ, p); to += 4; hicap = 1; }
|
||||
#else
|
||||
#define mkCTL { if ((to += 2) <= Screen_cols) \
|
||||
PUTT("%s^%c", (!hicap) ? Curwin->capclr_msg : "", uch + '@'); hicap = 1; }
|
||||
@ -3125,7 +3144,7 @@ static void insp_mkrow_raw (int col, int row) {
|
||||
#endif
|
||||
#define mkSTD { capNO; if (++to <= Screen_cols) { static char _str[2]; \
|
||||
_str[0] = uch; putp(_str); } }
|
||||
char tline[SCREENMAX];
|
||||
unsigned char tline[SCREENMAX];
|
||||
int fr, to, ofs;
|
||||
int hicap = 0;
|
||||
|
||||
@ -3133,7 +3152,7 @@ static void insp_mkrow_raw (int col, int row) {
|
||||
memcpy(tline, Insp_p[row] + col, sizeof(tline));
|
||||
else tline[0] = '\n';
|
||||
|
||||
for (fr = 0, to = 0, ofs = 0; to < Screen_cols -1; fr++) {
|
||||
for (fr = 0, to = 0, ofs = 0; to < Screen_cols; fr++) {
|
||||
if (!ofs)
|
||||
ofs = insp_find_ofs(col + fr, row);
|
||||
if (col + fr < ofs) {
|
||||
@ -3166,20 +3185,20 @@ static void insp_mkrow_raw (int col, int row) {
|
||||
* characters will then be displayed in two positions like '^A'.
|
||||
* ( assuming they can even get past those 'gettext' utilities ) */
|
||||
static void insp_mkrow_utf8 (int col, int row) {
|
||||
#define maxSZ ( Screen_cols - (to + 1) )
|
||||
#define maxSZ ( Screen_cols - to )
|
||||
#define mkFND { PUTT("%s%.*s%s", Curwin->capclr_hdr, maxSZ, Insp_sel->fstr, Caps_off); \
|
||||
fr += Insp_sel->flen; to += Insp_sel->flen; }
|
||||
#ifndef INSP_JUSTNOT
|
||||
#define mkCTL { int x = maxSZ; const char *p = fmtmk("^%c", uch + '@'); \
|
||||
PUTT("%s%.*s%s", Curwin->capclr_msg, x, p, Caps_off); to += 2; }
|
||||
#define mkCTL { const char *p = fmtmk("^%c", uch + '@'); \
|
||||
PUTT("%s%.*s%s", Curwin->capclr_msg, maxSZ, p, Caps_off); to += 2; }
|
||||
#else
|
||||
#define mkCTL { if ((to += 2) <= Screen_cols) \
|
||||
PUTT("%s^%c%s", Curwin->capclr_msg, uch + '@', Caps_off); }
|
||||
#endif
|
||||
#define mkNUL { buf1[0] = ' '; doPUT(buf1) }
|
||||
#define doPUT(buf) if (++to <= Screen_cols) putp(buf);
|
||||
#define doPUT(buf) if ((to += cno) <= Screen_cols) putp(buf);
|
||||
static char buf1[2], buf2[3], buf3[4], buf4[5];
|
||||
char tline[BIGBUFSIZ];
|
||||
unsigned char tline[BIGBUFSIZ];
|
||||
int fr, to, ofs;
|
||||
|
||||
col = utf8_proper_col(Insp_p[row], col, 1);
|
||||
@ -3187,15 +3206,17 @@ static void insp_mkrow_utf8 (int col, int row) {
|
||||
memcpy(tline, Insp_p[row] + col, sizeof(tline));
|
||||
else tline[0] = '\n';
|
||||
|
||||
for (fr = 0, to = 0, ofs = 0; to < Screen_cols -1; ) {
|
||||
for (fr = 0, to = 0, ofs = 0; to < Screen_cols; ) {
|
||||
if (!ofs)
|
||||
ofs = insp_find_ofs(col + fr, row);
|
||||
if (col + fr < ofs) {
|
||||
unsigned char uch = tline[fr++];
|
||||
switch (UTF8_tab[(int)uch]) {
|
||||
unsigned char uch = tline[fr];
|
||||
int bno = UTF8_tab[uch];
|
||||
int cno = utf8_cols(&tline[fr++], bno);
|
||||
switch (bno) {
|
||||
case 1:
|
||||
if (uch == '\n') break;
|
||||
else if (uch < 32) mkCTL
|
||||
if (uch < 32) mkCTL
|
||||
else if (uch == 127) mkNUL
|
||||
else { buf1[0] = uch; doPUT(buf1) }
|
||||
break;
|
||||
|
||||
@ -45,6 +45,7 @@
|
||||
//#define OFF_SCROLLBK /* disable tty emulators scrollback buffer */
|
||||
//#define OFF_STDERROR /* disable our stderr buffering (redirect) */
|
||||
//#define OFF_STDIOLBF /* disable our own stdout _IOFBF override */
|
||||
//#define OFF_XTRAWIDE /* disable our extra wide multi-byte logic */
|
||||
//#define PRETEND2_5_X /* pretend we're linux 2.5.x (for IO-wait) */
|
||||
//#define PRETEND8CPUS /* pretend we're smp with 8 ticsers (sic) */
|
||||
//#define PRETENDNOCAP /* use a terminal without essential caps */
|
||||
@ -685,6 +686,7 @@ typedef struct WIN_t {
|
||||
//atic void xalloc_our_handler (const char *fmts, ...);
|
||||
/*------ Special UTF-8 Multi-Byte support ------------------------------*/
|
||||
/*atic char UTF8_tab[] = { ... } */
|
||||
//atic inline int utf8_cols (const unsigned char *p, int n);
|
||||
//atic int utf8_delta (const char *str);
|
||||
//atic int utf8_embody (const char *str, int width);
|
||||
//atic const char *utf8_justify (const char *str, int width, int justr);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user