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Implement the single-byte equivalent of getwch()

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This implementation assembles a wide character from a stream of
multibyte-forming bytes.
This commit is contained in:
John Zaitseff 2011-08-26 04:51:44 +10:00
parent 4c99f9a57f
commit dffb4c59fe
2 changed files with 77 additions and 7 deletions
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82
src/intf.c
View File

@ -322,7 +322,7 @@ static void mkchstr_conv (chtype *restrict chbuf, int chbufsize,
This function is either a wrapper (with modifications) for wget_wch()
from Curses, or an implementation of that function using wgetch().
*/
static int getwch (WINDOW *win, wint_t *wch);
static int getwch (WINDOW *win, wint_t *restrict wch);
/*
@ -1755,7 +1755,7 @@ int right (WINDOW *win, int y, int x, chtype attr_norm, chtype attr_alt1,
#if defined(HAVE_CURSES_ENHANCED) || defined(HAVE_NCURSESW)
int getwch (WINDOW *win, wint_t *wch)
int getwch (WINDOW *win, wint_t *restrict wch)
{
int ret = wget_wch(win, wch);
@ -1768,6 +1768,7 @@ int getwch (WINDOW *win, wint_t *wch)
(due to the same codes being returned by getch()). We do
not use iswcntrl() as certain additional Unicode
characters are also control characters (eg, U+2028) */
*wch = (unsigned char) c;
ret = KEY_CODE_YES;
}
}
@ -1777,10 +1778,79 @@ int getwch (WINDOW *win, wint_t *wch)
#else // !defined(HAVE_CURSES_ENHANCED) && !defined(HAVE_NCURSESW)
int getwch (WINDOW *win, wint_t *wch)
int getwch (WINDOW *win, wint_t *restrict wch)
{
#error "Single-byte version of getwch() not yet implemented"
"Single-byte version of getwch() not yet implemented"
static mbstate_t *mbstate; // Current shift state
char buf[MB_LEN_MAX * 8]; // Allow space for redundant shifts
mbstate_t mbcopy;
int len, ret;
wchar_t val = 0;
if (mbstate == NULL) {
mbstate = xmalloc(sizeof(mbstate_t));
memset(mbstate, 0, sizeof(mbstate_t));
}
len = 0;
while (true) {
ret = wgetch(win);
if (ret == ERR) {
break;
} else if (ret >= 0400) {
// Assume any non-ASCII result is a function key
if (len > 0) {
// Function key is interrupting an incomplete multibyte char!
ungetch(ret);
ret = ERR;
} else {
val = ret;
ret = KEY_CODE_YES;
}
break;
} else if (len >= sizeof(buf) - 1) {
// Too many characters
ungetch(ret);
ret = ERR;
break;
} else {
buf[len++] = ret;
// Do we have a complete multibyte keypress?
memcpy(&mbcopy, mbstate, sizeof(mbstate_t));
size_t n = mbrtowc(&val, buf, len, &mbcopy);
if (n == (size_t) -1) {
// Invalid character
ungetch(ret);
ret = ERR;
break;
} else if (n == (size_t) -2) {
// Incomplete sequence: wait for more bytes to come
;
} else {
// A valid multibyte sequence
memcpy(mbstate, &mbcopy, sizeof(mbstate_t));
char c = wctob(val);
if ((c >= 0 && c < ' ') || c == 0x7F) {
/* Make control characters (and DEL) appear to be
similar to function keys. */
val = (unsigned char) c;
ret = KEY_CODE_YES;
} else {
// An ordinary key
ret = OK;
}
break;
}
}
}
if (wch != NULL) {
*wch = val;
}
return ret;
}
#endif // !defined(HAVE_CURSES_ENHANCED) && !defined(HAVE_NCURSESW)
@ -1789,7 +1859,7 @@ int getwch (WINDOW *win, wint_t *wch)
/***********************************************************************/
// gettxchar: Read a character from the keyboard
int gettxchar (WINDOW *win, wint_t *wch)
int gettxchar (WINDOW *win, wint_t *restrict wch)
{
int ret;

2
src/intf.h
View File

@ -578,7 +578,7 @@ extern int right (WINDOW *win, int y, int x, chtype attr_norm, chtype attr_alt1,
returned. ERR is never returned. The key is NOT echoed to the
terminal display, nor is the cursor visibility affected.
*/
extern int gettxchar (WINDOW *win, wint_t *wch);
extern int gettxchar (WINDOW *win, wint_t *restrict wch);
/*