mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
1d5cfebaca
large file, jump to the end, scroll backwards with "b" and try to search backwards afterwards. Submitted by: Matthias Scheler
927 lines
19 KiB
C
927 lines
19 KiB
C
/* $FreeBSD$ */
|
|
/*
|
|
* Copyright (C) 1984-2002 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 about less, or for information on how to
|
|
* contact the author, 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"
|
|
|
|
#define IS_CONT(c) (((c) & 0xC0) == 0x80)
|
|
|
|
public char *linebuf = NULL; /* Buffer which holds the current output line */
|
|
static char *attr = NULL; /* Extension of linebuf to hold attributes */
|
|
public int size_linebuf = 0; /* Size of line buffer (and attr buffer) */
|
|
|
|
public 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 */
|
|
|
|
static int curr; /* Index into linebuf */
|
|
static int column; /* Printable length, accounting for
|
|
backspaces, etc. */
|
|
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 int lmargin; /* Left margin */
|
|
static int hilites; /* Number of hilites in this line */
|
|
static char pendc;
|
|
static POSITION pendpos;
|
|
static char *end_ansi_chars;
|
|
|
|
static int do_append();
|
|
|
|
extern int bs_mode;
|
|
extern int linenums;
|
|
extern int ctldisp;
|
|
extern int twiddle;
|
|
extern int binattr;
|
|
extern int status_col;
|
|
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;
|
|
|
|
/*
|
|
* Initialize from environment variables.
|
|
*/
|
|
public void
|
|
init_line()
|
|
{
|
|
end_ansi_chars = lgetenv("LESSANSIENDCHARS");
|
|
if (end_ansi_chars == NULL || *end_ansi_chars == '\0')
|
|
end_ansi_chars = "m";
|
|
linebuf = (char *) ecalloc(LINEBUF_SIZE, sizeof(char));
|
|
attr = (char *) ecalloc(LINEBUF_SIZE, sizeof(char));
|
|
size_linebuf = LINEBUF_SIZE;
|
|
}
|
|
|
|
/*
|
|
* Expand the line buffer.
|
|
*/
|
|
static int
|
|
expand_linebuf()
|
|
{
|
|
int new_size = size_linebuf + LINEBUF_SIZE;
|
|
char *new_buf = (char *) calloc(new_size, sizeof(char));
|
|
char *new_attr = (char *) calloc(new_size, sizeof(char));
|
|
if (new_buf == NULL || new_attr == NULL)
|
|
{
|
|
if (new_attr != NULL)
|
|
free(new_attr);
|
|
if (new_buf != NULL)
|
|
free(new_buf);
|
|
return 1;
|
|
}
|
|
memcpy(new_buf, linebuf, size_linebuf * sizeof(char));
|
|
memcpy(new_attr, attr, size_linebuf * sizeof(char));
|
|
free(attr);
|
|
free(linebuf);
|
|
linebuf = new_buf;
|
|
attr = new_attr;
|
|
size_linebuf = new_size;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Rewind the line buffer.
|
|
*/
|
|
public void
|
|
prewind()
|
|
{
|
|
curr = 0;
|
|
column = 0;
|
|
overstrike = 0;
|
|
is_null_line = 0;
|
|
pendc = '\0';
|
|
lmargin = 0;
|
|
if (status_col)
|
|
lmargin += 1;
|
|
#if HILITE_SEARCH
|
|
hilites = 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Insert the line number (of the given position) into the line buffer.
|
|
*/
|
|
public void
|
|
plinenum(pos)
|
|
POSITION pos;
|
|
{
|
|
register LINENUM linenum = 0;
|
|
register 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 plinenum 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)
|
|
{
|
|
linebuf[curr] = ' ';
|
|
if (start_attnpos != NULL_POSITION &&
|
|
pos >= start_attnpos && pos < end_attnpos)
|
|
attr[curr] = AT_STANDOUT;
|
|
else
|
|
attr[curr] = 0;
|
|
curr++;
|
|
column++;
|
|
}
|
|
/*
|
|
* 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(pos) + 2];
|
|
int n;
|
|
|
|
linenumtoa(linenum, buf);
|
|
n = strlen(buf);
|
|
if (n < MIN_LINENUM_WIDTH)
|
|
n = MIN_LINENUM_WIDTH;
|
|
sprintf(linebuf+curr, "%*s ", n, buf);
|
|
n++; /* One space after the line number. */
|
|
for (i = 0; i < n; i++)
|
|
attr[curr+i] = AT_NORMAL;
|
|
curr += n;
|
|
column += n;
|
|
lmargin += n;
|
|
}
|
|
|
|
/*
|
|
* Append enough spaces to bring us to the lmargin.
|
|
*/
|
|
while (column < lmargin)
|
|
{
|
|
linebuf[curr] = ' ';
|
|
attr[curr++] = AT_NORMAL;
|
|
column++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Determine how many characters are required to shift N columns.
|
|
*/
|
|
static int
|
|
shift_chars(s, len)
|
|
char *s;
|
|
int len;
|
|
{
|
|
char *p = s;
|
|
|
|
/*
|
|
* Each char counts for one column, except ANSI color escape
|
|
* sequences use no columns since they don't move the cursor.
|
|
*/
|
|
while (*p != '\0' && len > 0)
|
|
{
|
|
if (*p++ != ESC)
|
|
{
|
|
len--;
|
|
} else
|
|
{
|
|
while (*p != '\0')
|
|
{
|
|
if (is_ansi_end(*p++))
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return (p - s);
|
|
}
|
|
|
|
/*
|
|
* Determine how many characters are required to shift N columns (UTF version).
|
|
* {{ FIXME: what about color escape sequences in UTF mode? }}
|
|
*/
|
|
static int
|
|
utf_shift_chars(s, len)
|
|
char *s;
|
|
int len;
|
|
{
|
|
int ulen = 0;
|
|
|
|
while (*s != '\0' && len > 0)
|
|
{
|
|
if (!IS_CONT(*s))
|
|
len--;
|
|
s++;
|
|
ulen++;
|
|
}
|
|
while (IS_CONT(*s))
|
|
{
|
|
s++;
|
|
ulen++;
|
|
}
|
|
return (ulen);
|
|
}
|
|
|
|
/*
|
|
* Shift the input line left.
|
|
* This means discarding N printable chars at the start of the buffer.
|
|
*/
|
|
static void
|
|
pshift(shift)
|
|
int shift;
|
|
{
|
|
int i;
|
|
int nchars;
|
|
|
|
if (shift > column - lmargin)
|
|
shift = column - lmargin;
|
|
if (shift > curr - lmargin)
|
|
shift = curr - lmargin;
|
|
|
|
if (utf_mode)
|
|
nchars = utf_shift_chars(linebuf + lmargin, shift);
|
|
else
|
|
nchars = shift_chars(linebuf + lmargin, shift);
|
|
if (nchars > curr)
|
|
nchars = curr;
|
|
for (i = 0; i < curr - nchars; i++)
|
|
{
|
|
linebuf[lmargin + i] = linebuf[lmargin + i + nchars];
|
|
attr[lmargin + i] = attr[lmargin + i + nchars];
|
|
}
|
|
curr -= nchars;
|
|
column -= shift;
|
|
cshift += shift;
|
|
}
|
|
|
|
/*
|
|
* Return the printing width of the start (enter) sequence
|
|
* for a given character attribute.
|
|
*/
|
|
static int
|
|
attr_swidth(a)
|
|
int a;
|
|
{
|
|
switch (a)
|
|
{
|
|
case AT_BOLD: return (bo_s_width);
|
|
case AT_UNDERLINE: return (ul_s_width);
|
|
case AT_BLINK: return (bl_s_width);
|
|
case AT_STANDOUT: return (so_s_width);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return the printing width of the end (exit) sequence
|
|
* for a given character attribute.
|
|
*/
|
|
static int
|
|
attr_ewidth(a)
|
|
int a;
|
|
{
|
|
switch (a)
|
|
{
|
|
case AT_BOLD: return (bo_e_width);
|
|
case AT_UNDERLINE: return (ul_e_width);
|
|
case AT_BLINK: return (bl_e_width);
|
|
case AT_STANDOUT: return (so_e_width);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return the printing width of a given character and attribute,
|
|
* if the character were added to the current position in the line buffer.
|
|
* 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.
|
|
*/
|
|
static int
|
|
pwidth(c, a)
|
|
int c;
|
|
int a;
|
|
{
|
|
register int w;
|
|
|
|
if (utf_mode && IS_CONT(c))
|
|
return (0);
|
|
|
|
if (c == '\b')
|
|
/*
|
|
* Backspace moves backwards one position.
|
|
*/
|
|
return (-1);
|
|
|
|
if (control_char(c))
|
|
/*
|
|
* Control characters do unpredicatable 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);
|
|
|
|
/*
|
|
* Other characters take one space,
|
|
* plus the width of any attribute enter/exit sequence.
|
|
*/
|
|
w = 1;
|
|
if (curr > 0 && attr[curr-1] != a)
|
|
w += attr_ewidth(attr[curr-1]);
|
|
if (a && (curr == 0 || attr[curr-1] != a))
|
|
w += attr_swidth(a);
|
|
return (w);
|
|
}
|
|
|
|
/*
|
|
* Delete the previous character in the line buffer.
|
|
*/
|
|
static void
|
|
backc()
|
|
{
|
|
curr--;
|
|
column -= pwidth(linebuf[curr], attr[curr]);
|
|
}
|
|
|
|
/*
|
|
* Are we currently within a recognized ANSI escape sequence?
|
|
*/
|
|
static int
|
|
in_ansi_esc_seq()
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* Search backwards for either an ESC (which means we ARE in a seq);
|
|
* or an end char (which means we're NOT in a seq).
|
|
*/
|
|
for (i = curr-1; i >= 0; i--)
|
|
{
|
|
if (linebuf[i] == ESC)
|
|
return (1);
|
|
if (is_ansi_end(linebuf[i]))
|
|
return (0);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Is a character the end of an ANSI escape sequence?
|
|
*/
|
|
public int
|
|
is_ansi_end(c)
|
|
char c;
|
|
{
|
|
return (strchr(end_ansi_chars, c) != NULL);
|
|
}
|
|
|
|
/*
|
|
* Append a character and attribute to the line buffer.
|
|
*/
|
|
#define STORE_CHAR(c,a,pos) \
|
|
do { if (store_char((c),(a),(pos))) return (1); else curr++; } while (0)
|
|
|
|
static int
|
|
store_char(c, a, pos)
|
|
int c;
|
|
int a;
|
|
POSITION pos;
|
|
{
|
|
register int w;
|
|
|
|
if (a != AT_NORMAL)
|
|
last_overstrike = a;
|
|
#if HILITE_SEARCH
|
|
if (is_hilited(pos, pos+1, 0))
|
|
{
|
|
/*
|
|
* This character should be highlighted.
|
|
* Override the attribute passed in.
|
|
*/
|
|
a = AT_STANDOUT;
|
|
hilites++;
|
|
}
|
|
#endif
|
|
if (ctldisp == OPT_ONPLUS && in_ansi_esc_seq())
|
|
w = 0;
|
|
else
|
|
w = pwidth(c, a);
|
|
if (ctldisp != OPT_ON && column + w + attr_ewidth(a) > sc_width)
|
|
/*
|
|
* Won't fit on screen.
|
|
*/
|
|
return (1);
|
|
|
|
if (curr >= size_linebuf-2)
|
|
{
|
|
/*
|
|
* Won't fit in line buffer.
|
|
* Try to expand it.
|
|
*/
|
|
if (expand_linebuf())
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Special handling for "magic cookie" terminals.
|
|
* If an attribute enter/exit sequence has a printing width > 0,
|
|
* and the sequence is adjacent to a space, delete the space.
|
|
* We just mark the space as invisible, to avoid having too
|
|
* many spaces deleted.
|
|
* {{ Note that even if the attribute width is > 1, we
|
|
* delete only one space. It's not worth trying to do more.
|
|
* It's hardly worth doing this much. }}
|
|
*/
|
|
if (curr > 0 && a != AT_NORMAL &&
|
|
linebuf[curr-1] == ' ' && attr[curr-1] == AT_NORMAL &&
|
|
attr_swidth(a) > 0)
|
|
{
|
|
/*
|
|
* We are about to append an enter-attribute sequence
|
|
* just after a space. Delete the space.
|
|
*/
|
|
attr[curr-1] = AT_INVIS;
|
|
column--;
|
|
} else if (curr > 0 && attr[curr-1] != AT_NORMAL &&
|
|
attr[curr-1] != AT_INVIS && c == ' ' && a == AT_NORMAL &&
|
|
attr_ewidth(attr[curr-1]) > 0)
|
|
{
|
|
/*
|
|
* We are about to append a space just after an
|
|
* exit-attribute sequence. Delete the space.
|
|
*/
|
|
a = AT_INVIS;
|
|
column--;
|
|
}
|
|
/* End of magic cookie handling. */
|
|
|
|
linebuf[curr] = c;
|
|
attr[curr] = a;
|
|
column += w;
|
|
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 = column + cshift - lmargin;
|
|
int i;
|
|
|
|
if (ntabstops < 2 || to_tab >= tabstops[ntabstops-1])
|
|
to_tab = tabdefault -
|
|
((to_tab - tabstops[ntabstops-1]) % tabdefault);
|
|
else
|
|
{
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
register int c;
|
|
POSITION pos;
|
|
{
|
|
int r;
|
|
|
|
if (pendc)
|
|
{
|
|
if (do_append(pendc, 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)
|
|
{
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
r = do_append(c, pos);
|
|
/*
|
|
* If we need to shift the line, do it.
|
|
* But wait until we get to at least the middle of the screen,
|
|
* so shifting it doesn't affect the chars we're currently
|
|
* pappending. (Bold & underline can get messed up otherwise.)
|
|
*/
|
|
if (cshift < hshift && column > sc_width / 2)
|
|
{
|
|
linebuf[curr] = '\0';
|
|
pshift(hshift - cshift);
|
|
}
|
|
return (r);
|
|
}
|
|
|
|
#define IS_UTF8_4BYTE(c) ( ((c) & 0xf8) == 0xf0 )
|
|
#define IS_UTF8_3BYTE(c) ( ((c) & 0xf0) == 0xe0 )
|
|
#define IS_UTF8_2BYTE(c) ( ((c) & 0xe0) == 0xc0 )
|
|
#define IS_UTF8_TRAIL(c) ( ((c) & 0xc0) == 0x80 )
|
|
|
|
static int
|
|
do_append(c, pos)
|
|
int c;
|
|
POSITION pos;
|
|
{
|
|
register char *s;
|
|
register int a;
|
|
|
|
#define STOREC(c,a) \
|
|
if ((c) == '\t') STORE_TAB((a),pos); else STORE_CHAR((c),(a),pos)
|
|
|
|
if (c == '\b')
|
|
{
|
|
switch (bs_mode)
|
|
{
|
|
case BS_NORMAL:
|
|
STORE_CHAR(c, AT_NORMAL, pos);
|
|
break;
|
|
case BS_CONTROL:
|
|
goto do_control_char;
|
|
case BS_SPECIAL:
|
|
if (curr == 0)
|
|
break;
|
|
backc();
|
|
overstrike = 1;
|
|
break;
|
|
}
|
|
} else if (overstrike)
|
|
{
|
|
/*
|
|
* Overstrike the character at the current position
|
|
* in the line buffer. This will cause either
|
|
* underline (if a "_" is overstruck),
|
|
* bold (if an identical character is overstruck),
|
|
* or just deletion of the character in the buffer.
|
|
*/
|
|
overstrike--;
|
|
if (utf_mode && IS_UTF8_4BYTE(c) && curr > 2 && (char)c == linebuf[curr-3])
|
|
{
|
|
backc();
|
|
backc();
|
|
backc();
|
|
STORE_CHAR(linebuf[curr], AT_BOLD, pos);
|
|
overstrike = 3;
|
|
} else if (utf_mode && (IS_UTF8_3BYTE(c) || (overstrike==2 && IS_UTF8_TRAIL(c))) && curr > 1 && (char)c == linebuf[curr-2])
|
|
{
|
|
backc();
|
|
backc();
|
|
STORE_CHAR(linebuf[curr], AT_BOLD, pos);
|
|
overstrike = 2;
|
|
} else if (utf_mode && curr > 0 && (IS_UTF8_2BYTE(c) || (overstrike==1 && IS_UTF8_TRAIL(c))) && (char)c == linebuf[curr-1])
|
|
{
|
|
backc();
|
|
STORE_CHAR(linebuf[curr], AT_BOLD, pos);
|
|
overstrike = 1;
|
|
} else if (utf_mode && curr > 0 && IS_UTF8_TRAIL(c) && attr[curr-1] == AT_UNDERLINE)
|
|
{
|
|
STOREC(c, AT_UNDERLINE);
|
|
} else if ((char)c == linebuf[curr])
|
|
{
|
|
/*
|
|
* Overstriking a char with itself means make it bold.
|
|
* But overstriking an underscore with itself is
|
|
* ambiguous. It could mean make it bold, or
|
|
* it could mean make it underlined.
|
|
* Use the previous overstrike to resolve it.
|
|
*/
|
|
if (c == '_' && last_overstrike != AT_NORMAL)
|
|
STOREC(c, last_overstrike);
|
|
else
|
|
STOREC(c, AT_BOLD);
|
|
} else if (c == '_')
|
|
{
|
|
if (utf_mode)
|
|
{
|
|
int i;
|
|
for (i = 0; i < 5; i++)
|
|
{
|
|
if (curr <= i || !IS_CONT(linebuf[curr-i]))
|
|
break;
|
|
attr[curr-i-1] = AT_UNDERLINE;
|
|
}
|
|
}
|
|
STOREC(linebuf[curr], AT_UNDERLINE);
|
|
} else if (linebuf[curr] == '_')
|
|
{
|
|
if (utf_mode)
|
|
{
|
|
if (IS_UTF8_2BYTE(c))
|
|
overstrike = 1;
|
|
else if (IS_UTF8_3BYTE(c))
|
|
overstrike = 2;
|
|
else if (IS_UTF8_4BYTE(c))
|
|
overstrike = 3;
|
|
}
|
|
STOREC(c, AT_UNDERLINE);
|
|
} else if (control_char(c))
|
|
goto do_control_char;
|
|
else
|
|
STOREC(c, AT_NORMAL);
|
|
} else if (c == '\t')
|
|
{
|
|
/*
|
|
* Expand a tab into spaces.
|
|
*/
|
|
switch (bs_mode)
|
|
{
|
|
case BS_CONTROL:
|
|
goto do_control_char;
|
|
case BS_NORMAL:
|
|
case BS_SPECIAL:
|
|
STORE_TAB(AT_NORMAL, pos);
|
|
break;
|
|
}
|
|
} else if (control_char(c))
|
|
{
|
|
do_control_char:
|
|
if (ctldisp == OPT_ON || (ctldisp == OPT_ONPLUS && c == ESC))
|
|
{
|
|
/*
|
|
* Output as a normal character.
|
|
*/
|
|
STORE_CHAR(c, AT_NORMAL, pos);
|
|
} else
|
|
{
|
|
/*
|
|
* Convert to printable representation.
|
|
*/
|
|
s = prchar(c);
|
|
a = binattr;
|
|
|
|
/*
|
|
* Make sure we can get the entire representation
|
|
* of the character on this line.
|
|
*/
|
|
if (column + (int) strlen(s) +
|
|
attr_swidth(a) + attr_ewidth(a) > sc_width)
|
|
return (1);
|
|
|
|
for ( ; *s != 0; s++)
|
|
STORE_CHAR(*s, a, pos);
|
|
}
|
|
} else
|
|
{
|
|
STOREC(c, AT_NORMAL);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Terminate the line in the line buffer.
|
|
*/
|
|
public void
|
|
pdone(endline)
|
|
int endline;
|
|
{
|
|
if (pendc && (pendc != '\r' || !endline))
|
|
/*
|
|
* If we had a pending character, put it in the buffer.
|
|
* But discard a pending CR if we are at end of line
|
|
* (that is, discard the CR in a CR/LF sequence).
|
|
*/
|
|
(void) do_append(pendc, pendpos);
|
|
|
|
/*
|
|
* Make sure we've shifted the line, if we need to.
|
|
*/
|
|
if (cshift < hshift)
|
|
pshift(hshift - cshift);
|
|
|
|
/*
|
|
* Add a newline if necessary,
|
|
* and append a '\0' to the end of the line.
|
|
*/
|
|
if (column < sc_width || !auto_wrap || ignaw || ctldisp == OPT_ON)
|
|
{
|
|
linebuf[curr] = '\n';
|
|
attr[curr] = AT_NORMAL;
|
|
curr++;
|
|
}
|
|
linebuf[curr] = '\0';
|
|
attr[curr] = AT_NORMAL;
|
|
|
|
#if HILITE_SEARCH
|
|
if (status_col && hilites > 0)
|
|
{
|
|
linebuf[0] = '*';
|
|
attr[0] = AT_STANDOUT;
|
|
}
|
|
#endif
|
|
/*
|
|
* If we are done with this line, reset the current shift.
|
|
*/
|
|
if (endline)
|
|
cshift = 0;
|
|
}
|
|
|
|
/*
|
|
* Get a character from the current line.
|
|
* Return the character as the function return value,
|
|
* and the character attribute in *ap.
|
|
*/
|
|
public int
|
|
gline(i, ap)
|
|
register int i;
|
|
register int *ap;
|
|
{
|
|
char *s;
|
|
|
|
if (is_null_line)
|
|
{
|
|
/*
|
|
* If there is no current line, we pretend the line is
|
|
* either "~" or "", depending on the "twiddle" flag.
|
|
*/
|
|
*ap = AT_BOLD;
|
|
s = (twiddle) ? "~\n" : "\n";
|
|
return (s[i]);
|
|
}
|
|
|
|
*ap = attr[i];
|
|
return (linebuf[i] & 0377);
|
|
}
|
|
|
|
/*
|
|
* Indicate that there is no current line.
|
|
*/
|
|
public void
|
|
null_line()
|
|
{
|
|
is_null_line = 1;
|
|
cshift = 0;
|
|
}
|
|
|
|
/*
|
|
* Analogous to forw_line(), but deals with "raw lines":
|
|
* lines which are not split for screen width.
|
|
* {{ This is supposed to be more efficient than forw_line(). }}
|
|
*/
|
|
public POSITION
|
|
forw_raw_line(curr_pos, linep)
|
|
POSITION curr_pos;
|
|
char **linep;
|
|
{
|
|
register int n;
|
|
register int c;
|
|
POSITION new_pos;
|
|
|
|
if (curr_pos == NULL_POSITION || ch_seek(curr_pos) ||
|
|
(c = ch_forw_get()) == EOI)
|
|
return (NULL_POSITION);
|
|
|
|
n = 0;
|
|
for (;;)
|
|
{
|
|
if (c == '\n' || c == EOI)
|
|
{
|
|
new_pos = ch_tell();
|
|
break;
|
|
}
|
|
if (n >= size_linebuf-1)
|
|
{
|
|
if (expand_linebuf())
|
|
{
|
|
/*
|
|
* Overflowed the input buffer.
|
|
* Pretend the line ended here.
|
|
*/
|
|
new_pos = ch_tell() - 1;
|
|
break;
|
|
}
|
|
}
|
|
linebuf[n++] = c;
|
|
c = ch_forw_get();
|
|
}
|
|
linebuf[n] = '\0';
|
|
if (linep != NULL)
|
|
*linep = linebuf;
|
|
return (new_pos);
|
|
}
|
|
|
|
/*
|
|
* Analogous to back_line(), but deals with "raw lines".
|
|
* {{ This is supposed to be more efficient than back_line(). }}
|
|
*/
|
|
public POSITION
|
|
back_raw_line(curr_pos, linep)
|
|
POSITION curr_pos;
|
|
char **linep;
|
|
{
|
|
register int n;
|
|
register int c;
|
|
POSITION new_pos;
|
|
|
|
if (curr_pos == NULL_POSITION || curr_pos <= ch_zero() ||
|
|
ch_seek(curr_pos-1))
|
|
return (NULL_POSITION);
|
|
|
|
n = size_linebuf;
|
|
linebuf[--n] = '\0';
|
|
for (;;)
|
|
{
|
|
c = ch_back_get();
|
|
if (c == '\n')
|
|
{
|
|
/*
|
|
* This is the newline ending the previous line.
|
|
* We have hit the beginning of the line.
|
|
*/
|
|
new_pos = ch_tell() + 1;
|
|
break;
|
|
}
|
|
if (c == EOI)
|
|
{
|
|
/*
|
|
* We have hit the beginning of the file.
|
|
* This must be the first line in the file.
|
|
* This must, of course, be the beginning of the line.
|
|
*/
|
|
new_pos = ch_zero();
|
|
break;
|
|
}
|
|
if (n <= 0)
|
|
{
|
|
int old_size_linebuf = size_linebuf;
|
|
char *fm;
|
|
char *to;
|
|
if (expand_linebuf())
|
|
{
|
|
/*
|
|
* Overflowed the input buffer.
|
|
* Pretend the line ended here.
|
|
*/
|
|
new_pos = ch_tell() + 1;
|
|
break;
|
|
}
|
|
/*
|
|
* Shift the data to the end of the new linebuf.
|
|
*/
|
|
for (fm = linebuf + old_size_linebuf - 1,
|
|
to = linebuf + size_linebuf - 1;
|
|
fm >= linebuf; fm--, to--)
|
|
*to = *fm;
|
|
n = size_linebuf - old_size_linebuf;
|
|
}
|
|
linebuf[--n] = c;
|
|
}
|
|
if (linep != NULL)
|
|
*linep = &linebuf[n];
|
|
return (new_pos);
|
|
}
|