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line.c
1659 lines (1540 loc) · 40.9 KB
/
line.c
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/*
* Copyright (C) 1984-2022 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
/*
* Routines to manipulate the "line buffer".
* The line buffer holds a line of output as it is being built
* in preparation for output to the screen.
*/
#include "less.h"
#include "charset.h"
#include "position.h"
#if MSDOS_COMPILER==WIN32C
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
#define MAX_PFX_WIDTH (MAX_LINENUM_WIDTH + MAX_STATUSCOL_WIDTH + 1)
static struct {
char *buf; /* Buffer which holds the current output line */
int *attr; /* Parallel to buf, to hold attributes */
int print; /* Index in buf of first printable char */
int end; /* Number of chars in buf */
char pfx[MAX_PFX_WIDTH]; /* Holds status column and line number */
int pfx_attr[MAX_PFX_WIDTH];
int pfx_end; /* Number of chars in pfx */
} linebuf;
/*
* Buffer of ansi sequences which have been shifted off the left edge
* of the screen.
*/
struct xbuffer shifted_ansi;
/*
* Ring buffer of last ansi sequences sent.
* While sending a line, these will be resent at the end
* of any highlighted string, to restore text modes.
* {{ Not ideal, since we don't really know how many to resend. }}
*/
#define NUM_LAST_ANSIS 3
static struct xbuffer last_ansi;
static struct xbuffer last_ansis[NUM_LAST_ANSIS];
static int curr_last_ansi;
public int size_linebuf = 0; /* Size of line buffer (and attr buffer) */
static struct ansi_state *line_ansi = NULL;
static int ansi_in_line;
static int hlink_in_line;
static int line_mark_attr;
static int cshift; /* Current left-shift of output line buffer */
public int hshift; /* Desired left-shift of output line buffer */
public int tabstops[TABSTOP_MAX] = { 0 }; /* Custom tabstops */
public int ntabstops = 1; /* Number of tabstops */
public int tabdefault = 8; /* Default repeated tabstops */
public POSITION highest_hilite; /* Pos of last hilite in file found so far */
static int end_column; /* Printable length, accounting for backspaces, etc. */
static int right_curr;
static int right_column;
static int overstrike; /* Next char should overstrike previous char */
static int last_overstrike = AT_NORMAL;
static int is_null_line; /* There is no current line */
static LWCHAR pendc;
static POSITION pendpos;
static char *end_ansi_chars;
static char *mid_ansi_chars;
static int in_hilite;
static int attr_swidth LESSPARAMS ((int a));
static int attr_ewidth LESSPARAMS ((int a));
static int do_append LESSPARAMS ((LWCHAR ch, char *rep, POSITION pos));
extern int sigs;
extern int bs_mode;
extern int linenums;
extern int ctldisp;
extern int twiddle;
extern int binattr;
extern int status_col;
extern int status_col_width;
extern int linenum_width;
extern int auto_wrap, ignaw;
extern int bo_s_width, bo_e_width;
extern int ul_s_width, ul_e_width;
extern int bl_s_width, bl_e_width;
extern int so_s_width, so_e_width;
extern int sc_width, sc_height;
extern int utf_mode;
extern POSITION start_attnpos;
extern POSITION end_attnpos;
extern char rscroll_char;
extern int rscroll_attr;
extern int use_color;
extern int status_line;
static char mbc_buf[MAX_UTF_CHAR_LEN];
static int mbc_buf_len = 0;
static int mbc_buf_index = 0;
static POSITION mbc_pos;
/* Configurable color map */
static char color_map[AT_NUM_COLORS][12] = {
"Wm", /* AT_COLOR_ATTN */
"kR", /* AT_COLOR_BIN */
"kR", /* AT_COLOR_CTRL */
"kY", /* AT_COLOR_ERROR */
"c", /* AT_COLOR_LINENUM */
"Wb", /* AT_COLOR_MARK */
"kC", /* AT_COLOR_PROMPT */
"kc", /* AT_COLOR_RSCROLL */
"kG", /* AT_COLOR_SEARCH */
"", /* AT_COLOR_HEADER */
"", /* AT_UNDERLINE */
"", /* AT_BOLD */
"", /* AT_BLINK */
"", /* AT_STANDOUT */
};
/* State while processing an ANSI escape sequence */
struct ansi_state {
int hindex; /* Index into hyperlink prefix */
int hlink; /* Processing hyperlink address? */
int prev_esc; /* Prev char was ESC (to detect ESC-\ seq) */
};
/*
* Initialize from environment variables.
*/
public void
init_line(VOID_PARAM)
{
int ax;
end_ansi_chars = lgetenv("LESSANSIENDCHARS");
if (isnullenv(end_ansi_chars))
end_ansi_chars = "m";
mid_ansi_chars = lgetenv("LESSANSIMIDCHARS");
if (isnullenv(mid_ansi_chars))
mid_ansi_chars = "0123456789:;[?!\"'#%()*+ ";
linebuf.buf = (char *) ecalloc(LINEBUF_SIZE, sizeof(char));
linebuf.attr = (int *) ecalloc(LINEBUF_SIZE, sizeof(int));
size_linebuf = LINEBUF_SIZE;
xbuf_init(&shifted_ansi);
xbuf_init(&last_ansi);
for (ax = 0; ax < NUM_LAST_ANSIS; ax++)
xbuf_init(&last_ansis[ax]);
curr_last_ansi = 0;
}
/*
* Expand the line buffer.
*/
static int
expand_linebuf(VOID_PARAM)
{
/* Double the size of the line buffer. */
int new_size = size_linebuf * 2;
char *new_buf = (char *) calloc(new_size, sizeof(char));
int *new_attr = (int *) calloc(new_size, sizeof(int));
if (new_buf == NULL || new_attr == NULL)
{
if (new_attr != NULL)
free(new_attr);
if (new_buf != NULL)
free(new_buf);
return 1;
}
/*
* We just calloc'd the buffers; copy the old contents.
*/
memcpy(new_buf, linebuf.buf, size_linebuf * sizeof(char));
memcpy(new_attr, linebuf.attr, size_linebuf * sizeof(int));
free(linebuf.attr);
free(linebuf.buf);
linebuf.buf = new_buf;
linebuf.attr = new_attr;
size_linebuf = new_size;
return 0;
}
/*
* Is a character ASCII?
*/
public int
is_ascii_char(ch)
LWCHAR ch;
{
return (ch <= 0x7F);
}
/*
*/
static void
inc_end_column(w)
int w;
{
if (end_column > right_column && w > 0)
{
right_column = end_column;
right_curr = linebuf.end;
}
end_column += w;
}
/*
* Rewind the line buffer.
*/
public void
prewind(VOID_PARAM)
{
int ax;
linebuf.print = 6; /* big enough for longest UTF-8 sequence */
linebuf.pfx_end = 0;
for (linebuf.end = 0; linebuf.end < linebuf.print; linebuf.end++)
{
linebuf.buf[linebuf.end] = '\0';
linebuf.attr[linebuf.end] = 0;
}
end_column = 0;
right_curr = 0;
right_column = 0;
cshift = 0;
overstrike = 0;
last_overstrike = AT_NORMAL;
mbc_buf_len = 0;
is_null_line = 0;
pendc = '\0';
in_hilite = 0;
ansi_in_line = 0;
hlink_in_line = 0;
line_mark_attr = 0;
xbuf_reset(&shifted_ansi);
xbuf_reset(&last_ansi);
for (ax = 0; ax < NUM_LAST_ANSIS; ax++)
xbuf_reset(&last_ansis[ax]);
curr_last_ansi = 0;
}
/*
* Set a character in the line buffer.
*/
static void
set_linebuf(n, ch, attr)
int n;
char ch;
int attr;
{
linebuf.buf[n] = ch;
linebuf.attr[n] = attr;
}
/*
* Append a character to the line buffer.
*/
static void
add_linebuf(ch, attr, w)
char ch;
int attr;
int w;
{
set_linebuf(linebuf.end++, ch, attr);
inc_end_column(w);
}
/*
* Append a string to the line buffer.
*/
static void
addstr_linebuf(s, attr, cw)
char *s;
int attr;
int cw;
{
for ( ; *s != '\0'; s++)
add_linebuf(*s, attr, cw);
}
/*
* Set a character in the line prefix buffer.
*/
static void
set_pfx(n, ch, attr)
int n;
char ch;
int attr;
{
linebuf.pfx[n] = ch;
linebuf.pfx_attr[n] = attr;
}
/*
* Append a character to the line prefix buffer.
*/
static void
add_pfx(ch, attr)
char ch;
int attr;
{
set_pfx(linebuf.pfx_end++, ch, attr);
}
/*
* Insert the status column and line number into the line buffer.
*/
public void
plinestart(pos)
POSITION pos;
{
LINENUM linenum = 0;
int i;
if (linenums == OPT_ONPLUS)
{
/*
* Get the line number and put it in the current line.
* {{ Note: since find_linenum calls forw_raw_line,
* it may seek in the input file, requiring the caller
* of plinestart to re-seek if necessary. }}
* {{ Since forw_raw_line modifies linebuf, we must
* do this first, before storing anything in linebuf. }}
*/
linenum = find_linenum(pos);
}
/*
* Display a status column if the -J option is set.
*/
if (status_col || status_line)
{
char c = posmark(pos);
if (c != 0)
line_mark_attr = AT_HILITE|AT_COLOR_MARK;
else if (start_attnpos != NULL_POSITION &&
pos >= start_attnpos && pos <= end_attnpos)
line_mark_attr = AT_HILITE|AT_COLOR_ATTN;
if (status_col)
{
add_pfx(c ? c : ' ', line_mark_attr); /* column 0: status */
while (linebuf.pfx_end < status_col_width)
add_pfx(' ', AT_NORMAL);
}
}
/*
* Display the line number at the start of each line
* if the -N option is set.
*/
if (linenums == OPT_ONPLUS)
{
char buf[INT_STRLEN_BOUND(linenum) + 2];
int len;
linenum = vlinenum(linenum);
if (linenum == 0)
len = 0;
else
{
linenumtoa(linenum, buf);
len = (int) strlen(buf);
}
for (i = 0; i < linenum_width - len; i++)
add_pfx(' ', AT_NORMAL);
for (i = 0; i < len; i++)
add_pfx(buf[i], AT_BOLD|AT_COLOR_LINENUM);
add_pfx(' ', AT_NORMAL);
}
end_column = linebuf.pfx_end;
}
/*
* Return the width of the line prefix (status column and line number).
* {{ Actual line number can be wider than linenum_width. }}
*/
public int
line_pfx_width(VOID_PARAM)
{
int width = 0;
if (status_col)
width += status_col_width;
if (linenums == OPT_ONPLUS)
width += linenum_width + 1;
return width;
}
/*
* Shift line left so that the last char is just to the left
* of the first visible column.
*/
public void
pshift_all(VOID_PARAM)
{
int i;
for (i = linebuf.print; i < linebuf.end; i++)
if (linebuf.attr[i] == AT_ANSI)
xbuf_add(&shifted_ansi, linebuf.buf[i]);
linebuf.end = linebuf.print;
end_column = linebuf.pfx_end;
}
/*
* Return the printing width of the start (enter) sequence
* for a given character attribute.
*/
static int
attr_swidth(a)
int a;
{
int w = 0;
a = apply_at_specials(a);
if (a & AT_UNDERLINE)
w += ul_s_width;
if (a & AT_BOLD)
w += bo_s_width;
if (a & AT_BLINK)
w += bl_s_width;
if (a & AT_STANDOUT)
w += so_s_width;
return w;
}
/*
* Return the printing width of the end (exit) sequence
* for a given character attribute.
*/
static int
attr_ewidth(a)
int a;
{
int w = 0;
a = apply_at_specials(a);
if (a & AT_UNDERLINE)
w += ul_e_width;
if (a & AT_BOLD)
w += bo_e_width;
if (a & AT_BLINK)
w += bl_e_width;
if (a & AT_STANDOUT)
w += so_e_width;
return w;
}
/*
* Return the printing width of a given character and attribute,
* if the character were added after prev_ch.
* Adding a character with a given attribute may cause an enter or exit
* attribute sequence to be inserted, so this must be taken into account.
*/
public int
pwidth(ch, a, prev_ch, prev_a)
LWCHAR ch;
int a;
LWCHAR prev_ch;
int prev_a;
{
int w;
if (ch == '\b')
{
/*
* Backspace moves backwards one or two positions.
*/
if (prev_a & (AT_ANSI|AT_BINARY))
return (int)strlen(prchar('\b'));
return (utf_mode && is_wide_char(prev_ch)) ? -2 : -1;
}
if (!utf_mode || is_ascii_char(ch))
{
if (control_char((char)ch))
{
/*
* Control characters do unpredictable things,
* so we don't even try to guess; say it doesn't move.
* This can only happen if the -r flag is in effect.
*/
return (0);
}
} else
{
if (is_composing_char(ch) || is_combining_char(prev_ch, ch))
{
/*
* Composing and combining chars take up no space.
*
* Some terminals, upon failure to compose a
* composing character with the character(s) that
* precede(s) it will actually take up one end_column
* for the composing character; there isn't much
* we could do short of testing the (complex)
* composition process ourselves and printing
* a binary representation when it fails.
*/
return (0);
}
}
/*
* Other characters take one or two columns,
* plus the width of any attribute enter/exit sequence.
*/
w = 1;
if (is_wide_char(ch))
w++;
if (linebuf.end > 0 && !is_at_equiv(linebuf.attr[linebuf.end-1], a))
w += attr_ewidth(linebuf.attr[linebuf.end-1]);
if (apply_at_specials(a) != AT_NORMAL &&
(linebuf.end == 0 || !is_at_equiv(linebuf.attr[linebuf.end-1], a)))
w += attr_swidth(a);
return (w);
}
/*
* Delete to the previous base character in the line buffer.
*/
static int
backc(VOID_PARAM)
{
LWCHAR ch;
char *p;
if (linebuf.end == 0)
return (0);
p = &linebuf.buf[linebuf.end];
ch = step_char(&p, -1, linebuf.buf);
/* Skip back to the next nonzero-width char. */
while (p > linebuf.buf)
{
LWCHAR prev_ch;
int width;
linebuf.end = (int) (p - linebuf.buf);
prev_ch = step_char(&p, -1, linebuf.buf);
width = pwidth(ch, linebuf.attr[linebuf.end], prev_ch, linebuf.attr[linebuf.end-1]);
end_column -= width;
/* {{ right_column? }} */
if (width > 0)
break;
ch = prev_ch;
}
return (1);
}
/*
* Is a character the end of an ANSI escape sequence?
*/
public int
is_ansi_end(ch)
LWCHAR ch;
{
if (!is_ascii_char(ch))
return (0);
return (strchr(end_ansi_chars, (char) ch) != NULL);
}
/*
* Can a char appear in an ANSI escape sequence, before the end char?
*/
public int
is_ansi_middle(ch)
LWCHAR ch;
{
if (!is_ascii_char(ch))
return (0);
if (is_ansi_end(ch))
return (0);
return (strchr(mid_ansi_chars, (char) ch) != NULL);
}
/*
* Skip past an ANSI escape sequence.
* pp is initially positioned just after the CSI_START char.
*/
public void
skip_ansi(pansi, pp, limit)
struct ansi_state *pansi;
char **pp;
constant char *limit;
{
LWCHAR c;
do {
c = step_char(pp, +1, limit);
} while (*pp < limit && ansi_step(pansi, c) == ANSI_MID);
/* Note that we discard final char, for which is_ansi_end is true. */
}
/*
* Determine if a character starts an ANSI escape sequence.
* If so, return an ansi_state struct; otherwise return NULL.
*/
public struct ansi_state *
ansi_start(ch)
LWCHAR ch;
{
struct ansi_state *pansi;
if (!IS_CSI_START(ch))
return NULL;
pansi = ecalloc(1, sizeof(struct ansi_state));
pansi->hindex = 0;
pansi->hlink = 0;
pansi->prev_esc = 0;
return pansi;
}
/*
* Determine whether the next char in an ANSI escape sequence
* ends the sequence.
*/
public int
ansi_step(pansi, ch)
struct ansi_state *pansi;
LWCHAR ch;
{
if (pansi->hlink)
{
/* Hyperlink ends with \7 or ESC-backslash. */
if (ch == '\7')
return ANSI_END;
if (pansi->prev_esc && ch == '\\')
return ANSI_END;
pansi->prev_esc = (ch == ESC);
return ANSI_MID;
}
if (pansi->hindex >= 0)
{
static char hlink_prefix[] = ESCS "]8;";
// FixME: [2023-08-14; rivy] verify re-cast of `hlink_prefix[pansi->hindex]' to LWCHAR is correct and safe
if (ch == (LWCHAR)hlink_prefix[pansi->hindex] ||
(pansi->hindex == 0 && IS_CSI_START(ch)))
{
pansi->hindex++;
if (hlink_prefix[pansi->hindex] == '\0')
pansi->hlink = 1; /* now processing hyperlink addr */
return ANSI_MID;
}
pansi->hindex = -1; /* not a hyperlink */
}
/* Check for SGR sequences */
if (is_ansi_middle(ch))
return ANSI_MID;
if (is_ansi_end(ch))
return ANSI_END;
return ANSI_ERR;
}
/*
* Free an ansi_state structure.
*/
public void
ansi_done(pansi)
struct ansi_state *pansi;
{
free(pansi);
}
/*
* Will w characters in attribute a fit on the screen?
*/
static int
fits_on_screen(w, a)
int w;
int a;
{
if (ctldisp == OPT_ON)
/* We're not counting, so say that everything fits. */
return 1;
return (end_column - cshift + w + attr_ewidth(a) <= sc_width);
}
/*
* Append a character and attribute to the line buffer.
*/
#define STORE_CHAR(ch,a,rep,pos) \
do { \
if (store_char((ch),(a),(rep),(pos))) return (1); \
} while (0)
static int
store_char(ch, a, rep, pos)
LWCHAR ch;
int a;
char *rep;
POSITION pos;
{
int w;
int i;
int replen;
char cs;
i = (a & (AT_UNDERLINE|AT_BOLD));
if (i != AT_NORMAL)
last_overstrike = i;
#if HILITE_SEARCH
{
int matches;
int resend_last = 0;
int hl_attr;
if (pos == NULL_POSITION)
{
/* Color the prompt unless it has ansi sequences in it. */
hl_attr = ansi_in_line ? 0 : AT_STANDOUT|AT_COLOR_PROMPT;
} else
{
hl_attr = is_hilited_attr(pos, pos+1, 0, &matches);
if (hl_attr == 0 && status_line)
hl_attr = line_mark_attr;
}
if (hl_attr)
{
/*
* This character should be highlighted.
* Override the attribute passed in.
*/
if (a != AT_ANSI)
{
if (highest_hilite != NULL_POSITION && pos != NULL_POSITION && pos > highest_hilite)
highest_hilite = pos;
a |= hl_attr;
}
in_hilite = 1;
} else
{
if (in_hilite)
{
/*
* This is the first non-hilited char after a hilite.
* Resend the last ANSI seq to restore color.
*/
resend_last = 1;
}
in_hilite = 0;
}
if (resend_last)
{
int ai;
for (ai = 0; ai < NUM_LAST_ANSIS; ai++)
{
int ax = (curr_last_ansi + ai) % NUM_LAST_ANSIS;
for (i = 0; i < last_ansis[ax].end; i++)
STORE_CHAR(last_ansis[ax].data[i], AT_ANSI, NULL, pos);
}
}
}
#endif
if (a == AT_ANSI) {
w = 0;
} else {
char *p = &linebuf.buf[linebuf.end];
LWCHAR prev_ch = (linebuf.end > 0) ? step_char(&p, -1, linebuf.buf) : 0;
int prev_a = (linebuf.end > 0) ? linebuf.attr[linebuf.end-1] : 0;
w = pwidth(ch, a, prev_ch, prev_a);
}
if (!fits_on_screen(w, a))
return (1);
if (rep == NULL)
{
cs = (char) ch;
rep = &cs;
replen = 1;
} else
{
replen = utf_len(rep[0]);
}
if (linebuf.end + replen >= size_linebuf-6)
{
/*
* Won't fit in line buffer.
* Try to expand it.
*/
if (expand_linebuf())
return (1);
}
if (cshift == hshift && shifted_ansi.end > 0)
{
/* Copy shifted ANSI sequences to beginning of line. */
for (i = 0; i < shifted_ansi.end; i++)
add_linebuf(shifted_ansi.data[i], AT_ANSI, 0);
xbuf_reset(&shifted_ansi);
}
/* Add the char to the buf, even if we will left-shift it next. */
inc_end_column(w);
for (i = 0; i < replen; i++)
add_linebuf(*rep++, a, 0);
if (cshift < hshift)
{
/* We haven't left-shifted enough yet. */
if (a == AT_ANSI)
xbuf_add(&shifted_ansi, ch); /* Save ANSI attributes */
if (linebuf.end > linebuf.print)
{
/* Shift left enough to put last byte of this char at print-1. */
int i;
for (i = 0; i < linebuf.print; i++)
{
linebuf.buf[i] = linebuf.buf[i+replen];
linebuf.attr[i] = linebuf.attr[i+replen];
}
linebuf.end -= replen;
cshift += w;
/*
* If the char we just left-shifted was double width,
* the 2 spaces we shifted may be too much.
* Represent the "half char" at start of line with a highlighted space.
*/
while (cshift > hshift)
{
add_linebuf(' ', rscroll_attr, 0);
cshift--;
}
}
}
return (0);
}
#define STORE_STRING(s,a,pos) \
do { if (store_string((s),(a),(pos))) return (1); } while (0)
static int
store_string(s, a, pos)
char *s;
int a;
POSITION pos;
{
if (!fits_on_screen(strlen(s), a))
return 1;
for ( ; *s != 0; s++)
STORE_CHAR(*s, a, NULL, pos);
return 0;
}
/*
* Append a tab to the line buffer.
* Store spaces to represent the tab.
*/
#define STORE_TAB(a,pos) \
do { if (store_tab((a),(pos))) return (1); } while (0)
static int
store_tab(attr, pos)
int attr;
POSITION pos;
{
int to_tab = end_column - linebuf.pfx_end;
if (ntabstops < 2 || to_tab >= tabstops[ntabstops-1])
to_tab = tabdefault -
((to_tab - tabstops[ntabstops-1]) % tabdefault);
else
{
int i;
for (i = ntabstops - 2; i >= 0; i--)
if (to_tab >= tabstops[i])
break;
to_tab = tabstops[i+1] - to_tab;
}
do {
STORE_CHAR(' ', attr, " ", pos);
} while (--to_tab > 0);
return 0;
}
#define STORE_PRCHAR(c, pos) \
do { if (store_prchar((c), (pos))) return 1; } while (0)
static int
store_prchar(c, pos)
LWCHAR c;
POSITION pos;
{
/*
* Convert to printable representation.
*/
STORE_STRING(prchar(c), AT_BINARY|AT_COLOR_CTRL, pos);
return 0;
}
static int
flush_mbc_buf(pos)
POSITION pos;
{
int i;
for (i = 0; i < mbc_buf_index; i++)
if (store_prchar(mbc_buf[i], pos))
return mbc_buf_index - i;
return 0;
}
/*
* Append a character to the line buffer.
* Expand tabs into spaces, handle underlining, boldfacing, etc.
* Returns 0 if ok, 1 if couldn't fit in buffer.
*/
public int
pappend(c, pos)
int c;
POSITION pos;
{
int r;
if (pendc)
{
if (c == '\r' && pendc == '\r')
return (0);
if (do_append(pendc, NULL, pendpos))
/*
* Oops. We've probably lost the char which
* was in pendc, since caller won't back up.
*/
return (1);
pendc = '\0';
}
if (c == '\r' && bs_mode == BS_SPECIAL)
{
if (mbc_buf_len > 0) /* utf_mode must be on. */
{
/* Flush incomplete (truncated) sequence. */
r = flush_mbc_buf(mbc_pos);
mbc_buf_index = r + 1;
mbc_buf_len = 0;
if (r)
return (mbc_buf_index);
}
/*
* Don't put the CR into the buffer until we see
* the next char. If the next char is a newline,
* discard the CR.
*/
pendc = c;
pendpos = pos;
return (0);
}
if (!utf_mode)
{
r = do_append(c, NULL, pos);
} else
{
/* Perform strict validation in all possible cases. */
if (mbc_buf_len == 0)
{
retry:
mbc_buf_index = 1;
*mbc_buf = c;
if (IS_ASCII_OCTET(c))
r = do_append(c, NULL, pos);
else if (IS_UTF8_LEAD(c))
{
mbc_buf_len = utf_len(c);
mbc_pos = pos;
return (0);
} else
/* UTF8_INVALID or stray UTF8_TRAIL */
r = flush_mbc_buf(pos);
} else if (IS_UTF8_TRAIL(c))
{
mbc_buf[mbc_buf_index++] = c;
if (mbc_buf_index < mbc_buf_len)
return (0);
if (is_utf8_well_formed(mbc_buf, mbc_buf_index))
r = do_append(get_wchar(mbc_buf), mbc_buf, mbc_pos);
else
/* Complete, but not shortest form, sequence. */
mbc_buf_index = r = flush_mbc_buf(mbc_pos);
mbc_buf_len = 0;
} else
{
/* Flush incomplete (truncated) sequence. */
r = flush_mbc_buf(mbc_pos);
mbc_buf_index = r + 1;
mbc_buf_len = 0;
/* Handle new char. */
if (!r)