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1245 lines
26 KiB
C
1245 lines
26 KiB
C
/*
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* Copyright (C) 1984-2011 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information about less, or for information on how to
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* contact the author, see the README file.
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*/
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/*
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* Routines to manipulate the "line buffer".
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* The line buffer holds a line of output as it is being built
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* in preparation for output to the screen.
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*/
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#include "less.h"
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#include "charset.h"
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static char *linebuf = NULL; /* Buffer which holds the current output line */
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static char *attr = NULL; /* Extension of linebuf to hold attributes */
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public int size_linebuf = 0; /* Size of line buffer (and attr buffer) */
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static int cshift; /* Current left-shift of output line buffer */
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public int hshift; /* Desired left-shift of output line buffer */
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public int tabstops[TABSTOP_MAX] = { 0 }; /* Custom tabstops */
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public int ntabstops = 1; /* Number of tabstops */
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public int tabdefault = 8; /* Default repeated tabstops */
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static int curr; /* Index into linebuf */
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static int column; /* Printable length, accounting for
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backspaces, etc. */
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static int overstrike; /* Next char should overstrike previous char */
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static int last_overstrike = AT_NORMAL;
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static int is_null_line; /* There is no current line */
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static int lmargin; /* Left margin */
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static char pendc;
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static POSITION pendpos;
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static char *end_ansi_chars;
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static char *mid_ansi_chars;
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static int attr_swidth();
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static int attr_ewidth();
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static int do_append();
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extern int sigs;
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extern int bs_mode;
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extern int linenums;
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extern int ctldisp;
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extern int twiddle;
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extern int binattr;
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extern int status_col;
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extern int auto_wrap, ignaw;
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extern int bo_s_width, bo_e_width;
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extern int ul_s_width, ul_e_width;
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extern int bl_s_width, bl_e_width;
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extern int so_s_width, so_e_width;
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extern int sc_width, sc_height;
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extern int utf_mode;
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extern POSITION start_attnpos;
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extern POSITION end_attnpos;
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static char mbc_buf[MAX_UTF_CHAR_LEN];
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static int mbc_buf_len = 0;
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static int mbc_buf_index = 0;
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static POSITION mbc_pos;
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/*
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* Initialize from environment variables.
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*/
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public void
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init_line()
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{
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end_ansi_chars = lgetenv("LESSANSIENDCHARS");
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if (end_ansi_chars == NULL || *end_ansi_chars == '\0')
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end_ansi_chars = "m";
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mid_ansi_chars = lgetenv("LESSANSIMIDCHARS");
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if (mid_ansi_chars == NULL || *mid_ansi_chars == '\0')
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mid_ansi_chars = "0123456789;[?!\"'#%()*+ ";
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linebuf = (char *) ecalloc(LINEBUF_SIZE, sizeof(char));
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attr = (char *) ecalloc(LINEBUF_SIZE, sizeof(char));
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size_linebuf = LINEBUF_SIZE;
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}
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/*
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* Expand the line buffer.
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*/
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static int
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expand_linebuf()
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{
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/* Double the size of the line buffer. */
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int new_size = size_linebuf * 2;
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/* Just realloc to expand the buffer, if we can. */
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#if HAVE_REALLOC
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char *new_buf = (char *) realloc(linebuf, new_size);
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char *new_attr = (char *) realloc(attr, new_size);
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#else
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char *new_buf = (char *) calloc(new_size, sizeof(char));
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char *new_attr = (char *) calloc(new_size, sizeof(char));
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#endif
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if (new_buf == NULL || new_attr == NULL)
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{
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if (new_attr != NULL)
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free(new_attr);
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if (new_buf != NULL)
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free(new_buf);
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return 1;
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}
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#if HAVE_REALLOC
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/*
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* We realloc'd the buffers; they already have the old contents.
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*/
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#if 0
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memset(new_buf + size_linebuf, 0, new_size - size_linebuf);
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memset(new_attr + size_linebuf, 0, new_size - size_linebuf);
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#endif
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#else
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/*
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* We just calloc'd the buffers; copy the old contents.
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*/
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memcpy(new_buf, linebuf, size_linebuf * sizeof(char));
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memcpy(new_attr, attr, size_linebuf * sizeof(char));
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free(attr);
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free(linebuf);
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#endif
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linebuf = new_buf;
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attr = new_attr;
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size_linebuf = new_size;
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return 0;
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}
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/*
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* Is a character ASCII?
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*/
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public int
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is_ascii_char(ch)
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LWCHAR ch;
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{
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return (ch <= 0x7F);
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}
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/*
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* Rewind the line buffer.
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*/
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public void
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prewind()
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{
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curr = 0;
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column = 0;
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cshift = 0;
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overstrike = 0;
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last_overstrike = AT_NORMAL;
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mbc_buf_len = 0;
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is_null_line = 0;
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pendc = '\0';
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lmargin = 0;
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if (status_col)
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lmargin += 1;
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}
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/*
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* Insert the line number (of the given position) into the line buffer.
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*/
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public void
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plinenum(pos)
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POSITION pos;
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{
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register LINENUM linenum = 0;
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register int i;
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if (linenums == OPT_ONPLUS)
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{
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/*
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* Get the line number and put it in the current line.
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* {{ Note: since find_linenum calls forw_raw_line,
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* it may seek in the input file, requiring the caller
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* of plinenum to re-seek if necessary. }}
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* {{ Since forw_raw_line modifies linebuf, we must
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* do this first, before storing anything in linebuf. }}
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*/
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linenum = find_linenum(pos);
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}
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/*
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* Display a status column if the -J option is set.
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*/
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if (status_col)
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{
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linebuf[curr] = ' ';
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if (start_attnpos != NULL_POSITION &&
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pos >= start_attnpos && pos < end_attnpos)
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attr[curr] = AT_NORMAL|AT_HILITE;
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else
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attr[curr] = AT_NORMAL;
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curr++;
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column++;
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}
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/*
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* Display the line number at the start of each line
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* if the -N option is set.
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*/
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if (linenums == OPT_ONPLUS)
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{
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char buf[INT_STRLEN_BOUND(pos) + 2];
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int n;
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linenumtoa(linenum, buf);
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n = strlen(buf);
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if (n < MIN_LINENUM_WIDTH)
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n = MIN_LINENUM_WIDTH;
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sprintf(linebuf+curr, "%*s ", n, buf);
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n++; /* One space after the line number. */
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for (i = 0; i < n; i++)
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attr[curr+i] = AT_NORMAL;
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curr += n;
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column += n;
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lmargin += n;
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}
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/*
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* Append enough spaces to bring us to the lmargin.
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*/
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while (column < lmargin)
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{
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linebuf[curr] = ' ';
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attr[curr++] = AT_NORMAL;
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column++;
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}
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}
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/*
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* Shift the input line left.
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* This means discarding N printable chars at the start of the buffer.
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*/
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static void
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pshift(shift)
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int shift;
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{
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LWCHAR prev_ch = 0;
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unsigned char c;
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int shifted = 0;
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int to;
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int from;
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int len;
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int width;
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int prev_attr;
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int next_attr;
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if (shift > column - lmargin)
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shift = column - lmargin;
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if (shift > curr - lmargin)
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shift = curr - lmargin;
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to = from = lmargin;
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/*
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* We keep on going when shifted == shift
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* to get all combining chars.
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*/
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while (shifted <= shift && from < curr)
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{
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c = linebuf[from];
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if (ctldisp == OPT_ONPLUS && IS_CSI_START(c))
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{
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/* Keep cumulative effect. */
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linebuf[to] = c;
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attr[to++] = attr[from++];
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while (from < curr && linebuf[from])
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{
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linebuf[to] = linebuf[from];
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attr[to++] = attr[from];
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if (!is_ansi_middle(linebuf[from++]))
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break;
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}
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continue;
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}
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width = 0;
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if (!IS_ASCII_OCTET(c) && utf_mode)
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{
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/* Assumes well-formedness validation already done. */
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LWCHAR ch;
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len = utf_len(c);
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if (from + len > curr)
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break;
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ch = get_wchar(linebuf + from);
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if (!is_composing_char(ch) && !is_combining_char(prev_ch, ch))
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width = is_wide_char(ch) ? 2 : 1;
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prev_ch = ch;
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} else
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{
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len = 1;
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if (c == '\b')
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/* XXX - Incorrect if several '\b' in a row. */
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width = (utf_mode && is_wide_char(prev_ch)) ? -2 : -1;
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else if (!control_char(c))
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width = 1;
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prev_ch = 0;
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}
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if (width == 2 && shift - shifted == 1) {
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/* Should never happen when called by pshift_all(). */
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attr[to] = attr[from];
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/*
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* Assume a wide_char will never be the first half of a
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* combining_char pair, so reset prev_ch in case we're
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* followed by a '\b'.
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*/
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prev_ch = linebuf[to++] = ' ';
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from += len;
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shifted++;
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continue;
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}
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/* Adjust width for magic cookies. */
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prev_attr = (to > 0) ? attr[to-1] : AT_NORMAL;
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next_attr = (from + len < curr) ? attr[from + len] : prev_attr;
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if (!is_at_equiv(attr[from], prev_attr) &&
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!is_at_equiv(attr[from], next_attr))
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{
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width += attr_swidth(attr[from]);
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if (from + len < curr)
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width += attr_ewidth(attr[from]);
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if (is_at_equiv(prev_attr, next_attr))
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{
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width += attr_ewidth(prev_attr);
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if (from + len < curr)
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width += attr_swidth(next_attr);
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}
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}
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if (shift - shifted < width)
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break;
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from += len;
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shifted += width;
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if (shifted < 0)
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shifted = 0;
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}
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while (from < curr)
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{
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linebuf[to] = linebuf[from];
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attr[to++] = attr[from++];
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}
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curr = to;
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column -= shifted;
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cshift += shifted;
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}
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/*
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*
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*/
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public void
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pshift_all()
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{
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pshift(column);
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}
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/*
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* Return the printing width of the start (enter) sequence
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* for a given character attribute.
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*/
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static int
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attr_swidth(a)
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int a;
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{
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int w = 0;
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a = apply_at_specials(a);
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if (a & AT_UNDERLINE)
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w += ul_s_width;
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if (a & AT_BOLD)
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w += bo_s_width;
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if (a & AT_BLINK)
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w += bl_s_width;
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if (a & AT_STANDOUT)
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w += so_s_width;
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return w;
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}
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/*
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* Return the printing width of the end (exit) sequence
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* for a given character attribute.
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*/
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static int
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attr_ewidth(a)
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int a;
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{
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int w = 0;
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a = apply_at_specials(a);
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if (a & AT_UNDERLINE)
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w += ul_e_width;
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if (a & AT_BOLD)
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w += bo_e_width;
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if (a & AT_BLINK)
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w += bl_e_width;
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if (a & AT_STANDOUT)
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w += so_e_width;
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return w;
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}
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/*
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* Return the printing width of a given character and attribute,
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* if the character were added to the current position in the line buffer.
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* Adding a character with a given attribute may cause an enter or exit
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* attribute sequence to be inserted, so this must be taken into account.
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*/
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static int
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pwidth(ch, a, prev_ch)
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LWCHAR ch;
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int a;
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LWCHAR prev_ch;
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{
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int w;
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if (ch == '\b')
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/*
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* Backspace moves backwards one or two positions.
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* XXX - Incorrect if several '\b' in a row.
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*/
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return (utf_mode && is_wide_char(prev_ch)) ? -2 : -1;
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if (!utf_mode || is_ascii_char(ch))
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{
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if (control_char((char)ch))
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{
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/*
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* Control characters do unpredictable things,
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* so we don't even try to guess; say it doesn't move.
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* This can only happen if the -r flag is in effect.
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*/
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return (0);
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}
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} else
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{
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if (is_composing_char(ch) || is_combining_char(prev_ch, ch))
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{
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/*
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* Composing and combining chars take up no space.
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*
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* Some terminals, upon failure to compose a
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* composing character with the character(s) that
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* precede(s) it will actually take up one column
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* for the composing character; there isn't much
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* we could do short of testing the (complex)
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* composition process ourselves and printing
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* a binary representation when it fails.
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*/
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return (0);
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}
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}
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/*
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* Other characters take one or two columns,
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* plus the width of any attribute enter/exit sequence.
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*/
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w = 1;
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if (is_wide_char(ch))
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w++;
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if (curr > 0 && !is_at_equiv(attr[curr-1], a))
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w += attr_ewidth(attr[curr-1]);
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if ((apply_at_specials(a) != AT_NORMAL) &&
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(curr == 0 || !is_at_equiv(attr[curr-1], a)))
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w += attr_swidth(a);
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return (w);
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}
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/*
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* Delete to the previous base character in the line buffer.
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* Return 1 if one is found.
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*/
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static int
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backc()
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{
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LWCHAR prev_ch;
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char *p = linebuf + curr;
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LWCHAR ch = step_char(&p, -1, linebuf + lmargin);
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int width;
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/* This assumes that there is no '\b' in linebuf. */
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while ( curr > lmargin
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&& column > lmargin
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&& (!(attr[curr - 1] & (AT_ANSI|AT_BINARY))))
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{
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curr = p - linebuf;
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prev_ch = step_char(&p, -1, linebuf + lmargin);
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width = pwidth(ch, attr[curr], prev_ch);
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column -= width;
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if (width > 0)
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return 1;
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ch = prev_ch;
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}
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return 0;
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}
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|
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/*
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* Are we currently within a recognized ANSI escape sequence?
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*/
|
|
static int
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in_ansi_esc_seq()
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{
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char *p;
|
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|
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/*
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* Search backwards for either an ESC (which means we ARE in a seq);
|
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* or an end char (which means we're NOT in a seq).
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*/
|
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for (p = &linebuf[curr]; p > linebuf; )
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{
|
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LWCHAR ch = step_char(&p, -1, linebuf);
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if (IS_CSI_START(ch))
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return (1);
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if (!is_ansi_middle(ch))
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return (0);
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}
|
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return (0);
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}
|
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|
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/*
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* Is a character the end of an ANSI escape sequence?
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*/
|
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public int
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is_ansi_end(ch)
|
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LWCHAR ch;
|
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{
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if (!is_ascii_char(ch))
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return (0);
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return (strchr(end_ansi_chars, (char) ch) != NULL);
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}
|
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|
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/*
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*
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*/
|
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public int
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is_ansi_middle(ch)
|
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LWCHAR ch;
|
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{
|
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if (!is_ascii_char(ch))
|
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return (0);
|
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if (is_ansi_end(ch))
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return (0);
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return (strchr(mid_ansi_chars, (char) ch) != NULL);
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}
|
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|
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/*
|
|
* 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 replen;
|
|
char cs;
|
|
|
|
w = (a & (AT_UNDERLINE|AT_BOLD)); /* Pre-use w. */
|
|
if (w != AT_NORMAL)
|
|
last_overstrike = w;
|
|
|
|
#if HILITE_SEARCH
|
|
{
|
|
int matches;
|
|
if (is_hilited(pos, pos+1, 0, &matches))
|
|
{
|
|
/*
|
|
* This character should be highlighted.
|
|
* Override the attribute passed in.
|
|
*/
|
|
if (a != AT_ANSI)
|
|
a |= AT_HILITE;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (ctldisp == OPT_ONPLUS && in_ansi_esc_seq())
|
|
{
|
|
if (!is_ansi_end(ch) && !is_ansi_middle(ch)) {
|
|
/* Remove whole unrecognized sequence. */
|
|
char *p = &linebuf[curr];
|
|
LWCHAR bch;
|
|
do {
|
|
bch = step_char(&p, -1, linebuf);
|
|
} while (p > linebuf && !IS_CSI_START(bch));
|
|
curr = p - linebuf;
|
|
return 0;
|
|
}
|
|
a = AT_ANSI; /* Will force re-AT_'ing around it. */
|
|
w = 0;
|
|
}
|
|
else if (ctldisp == OPT_ONPLUS && IS_CSI_START(ch))
|
|
{
|
|
a = AT_ANSI; /* Will force re-AT_'ing around it. */
|
|
w = 0;
|
|
}
|
|
else
|
|
{
|
|
char *p = &linebuf[curr];
|
|
LWCHAR prev_ch = step_char(&p, -1, linebuf);
|
|
w = pwidth(ch, a, prev_ch);
|
|
}
|
|
|
|
if (ctldisp != OPT_ON && column + w + attr_ewidth(a) > sc_width)
|
|
/*
|
|
* Won't fit on screen.
|
|
*/
|
|
return (1);
|
|
|
|
if (rep == NULL)
|
|
{
|
|
cs = (char) ch;
|
|
rep = &cs;
|
|
replen = 1;
|
|
} else
|
|
{
|
|
replen = utf_len(rep[0]);
|
|
}
|
|
if (curr + replen >= size_linebuf-6)
|
|
{
|
|
/*
|
|
* Won't fit in line buffer.
|
|
* Try to expand it.
|
|
*/
|
|
if (expand_linebuf())
|
|
return (1);
|
|
}
|
|
|
|
while (replen-- > 0)
|
|
{
|
|
linebuf[curr] = *rep++;
|
|
attr[curr] = a;
|
|
curr++;
|
|
}
|
|
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;
|
|
}
|
|
|
|
if (column + to_tab - 1 + pwidth(' ', attr, 0) + attr_ewidth(attr) > sc_width)
|
|
return 1;
|
|
|
|
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)
|
|
char c;
|
|
POSITION pos;
|
|
{
|
|
char *s;
|
|
|
|
/*
|
|
* Convert to printable representation.
|
|
*/
|
|
s = prchar(c);
|
|
|
|
/*
|
|
* Make sure we can get the entire representation
|
|
* of the character on this line.
|
|
*/
|
|
if (column + (int) strlen(s) - 1 +
|
|
pwidth(' ', binattr, 0) + attr_ewidth(binattr) > sc_width)
|
|
return 1;
|
|
|
|
for ( ; *s != 0; s++)
|
|
STORE_CHAR(*s, AT_BINARY, NULL, 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)
|
|
char c;
|
|
POSITION pos;
|
|
{
|
|
int r;
|
|
|
|
if (pendc)
|
|
{
|
|
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((LWCHAR) 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((LWCHAR) 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))
|
|
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)
|
|
goto retry;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
if (r)
|
|
{
|
|
/* How many chars should caller back up? */
|
|
r = (!utf_mode) ? 1 : mbc_buf_index;
|
|
}
|
|
return (r);
|
|
}
|
|
|
|
static int
|
|
do_append(ch, rep, pos)
|
|
LWCHAR ch;
|
|
char *rep;
|
|
POSITION pos;
|
|
{
|
|
register int a;
|
|
LWCHAR prev_ch;
|
|
|
|
a = AT_NORMAL;
|
|
|
|
if (ch == '\b')
|
|
{
|
|
if (bs_mode == BS_CONTROL)
|
|
goto do_control_char;
|
|
|
|
/*
|
|
* A better test is needed here so we don't
|
|
* backspace over part of the printed
|
|
* representation of a binary character.
|
|
*/
|
|
if ( curr <= lmargin
|
|
|| column <= lmargin
|
|
|| (attr[curr - 1] & (AT_ANSI|AT_BINARY)))
|
|
STORE_PRCHAR('\b', pos);
|
|
else if (bs_mode == BS_NORMAL)
|
|
STORE_CHAR(ch, AT_NORMAL, NULL, pos);
|
|
else if (bs_mode == BS_SPECIAL)
|
|
overstrike = backc();
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (overstrike > 0)
|
|
{
|
|
/*
|
|
* 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 = utf_mode ? -1 : 0;
|
|
/* To be correct, this must be a base character. */
|
|
prev_ch = get_wchar(linebuf + curr);
|
|
a = attr[curr];
|
|
if (ch == prev_ch)
|
|
{
|
|
/*
|
|
* 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 (ch == '_')
|
|
{
|
|
if ((a & (AT_BOLD|AT_UNDERLINE)) != AT_NORMAL)
|
|
a |= (AT_BOLD|AT_UNDERLINE);
|
|
else if (last_overstrike != AT_NORMAL)
|
|
a |= last_overstrike;
|
|
else
|
|
a |= AT_BOLD;
|
|
} else
|
|
a |= AT_BOLD;
|
|
} else if (ch == '_')
|
|
{
|
|
a |= AT_UNDERLINE;
|
|
ch = prev_ch;
|
|
rep = linebuf + curr;
|
|
} else if (prev_ch == '_')
|
|
{
|
|
a |= AT_UNDERLINE;
|
|
}
|
|
/* Else we replace prev_ch, but we keep its attributes. */
|
|
} else if (overstrike < 0)
|
|
{
|
|
if ( is_composing_char(ch)
|
|
|| is_combining_char(get_wchar(linebuf + curr), ch))
|
|
/* Continuation of the same overstrike. */
|
|
a = last_overstrike;
|
|
else
|
|
overstrike = 0;
|
|
}
|
|
|
|
if (ch == '\t')
|
|
{
|
|
/*
|
|
* Expand a tab into spaces.
|
|
*/
|
|
switch (bs_mode)
|
|
{
|
|
case BS_CONTROL:
|
|
goto do_control_char;
|
|
case BS_NORMAL:
|
|
case BS_SPECIAL:
|
|
STORE_TAB(a, pos);
|
|
break;
|
|
}
|
|
} else if ((!utf_mode || is_ascii_char(ch)) && control_char((char)ch))
|
|
{
|
|
do_control_char:
|
|
if (ctldisp == OPT_ON || (ctldisp == OPT_ONPLUS && IS_CSI_START(ch)))
|
|
{
|
|
/*
|
|
* Output as a normal character.
|
|
*/
|
|
STORE_CHAR(ch, AT_NORMAL, rep, pos);
|
|
} else
|
|
{
|
|
STORE_PRCHAR((char) ch, pos);
|
|
}
|
|
} else if (utf_mode && ctldisp != OPT_ON && is_ubin_char(ch))
|
|
{
|
|
char *s;
|
|
|
|
s = prutfchar(ch);
|
|
|
|
if (column + (int) strlen(s) - 1 +
|
|
pwidth(' ', binattr, 0) + attr_ewidth(binattr) > sc_width)
|
|
return (1);
|
|
|
|
for ( ; *s != 0; s++)
|
|
STORE_CHAR(*s, AT_BINARY, NULL, pos);
|
|
} else
|
|
{
|
|
STORE_CHAR(ch, a, rep, pos);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
public int
|
|
pflushmbc()
|
|
{
|
|
int r = 0;
|
|
|
|
if (mbc_buf_len > 0)
|
|
{
|
|
/* Flush incomplete (truncated) sequence. */
|
|
r = flush_mbc_buf(mbc_pos);
|
|
mbc_buf_len = 0;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Terminate the line in the line buffer.
|
|
*/
|
|
public void
|
|
pdone(endline, forw)
|
|
int endline;
|
|
int forw;
|
|
{
|
|
(void) pflushmbc();
|
|
|
|
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, NULL, pendpos);
|
|
|
|
/*
|
|
* Make sure we've shifted the line, if we need to.
|
|
*/
|
|
if (cshift < hshift)
|
|
pshift(hshift - cshift);
|
|
|
|
if (ctldisp == OPT_ONPLUS && is_ansi_end('m'))
|
|
{
|
|
/* Switch to normal attribute at end of line. */
|
|
char *p = "\033[m";
|
|
for ( ; *p != '\0'; p++)
|
|
{
|
|
linebuf[curr] = *p;
|
|
attr[curr++] = AT_ANSI;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add a newline if necessary,
|
|
* and append a '\0' to the end of the line.
|
|
* We output a newline if we're not at the right edge of the screen,
|
|
* or if the terminal doesn't auto wrap,
|
|
* or if this is really the end of the line AND the terminal ignores
|
|
* a newline at the right edge.
|
|
* (In the last case we don't want to output a newline if the terminal
|
|
* doesn't ignore it since that would produce an extra blank line.
|
|
* But we do want to output a newline if the terminal ignores it in case
|
|
* the next line is blank. In that case the single newline output for
|
|
* that blank line would be ignored!)
|
|
*/
|
|
if (column < sc_width || !auto_wrap || (endline && ignaw) || ctldisp == OPT_ON)
|
|
{
|
|
linebuf[curr] = '\n';
|
|
attr[curr] = AT_NORMAL;
|
|
curr++;
|
|
}
|
|
else if (ignaw && column >= sc_width && forw)
|
|
{
|
|
/*
|
|
* Terminals with "ignaw" don't wrap until they *really* need
|
|
* to, i.e. when the character *after* the last one to fit on a
|
|
* line is output. But they are too hard to deal with when they
|
|
* get in the state where a full screen width of characters
|
|
* have been output but the cursor is sitting on the right edge
|
|
* instead of at the start of the next line.
|
|
* So we nudge them into wrapping by outputting a space
|
|
* character plus a backspace. But do this only if moving
|
|
* forward; if we're moving backward and drawing this line at
|
|
* the top of the screen, the space would overwrite the first
|
|
* char on the next line. We don't need to do this "nudge"
|
|
* at the top of the screen anyway.
|
|
*/
|
|
linebuf[curr] = ' ';
|
|
attr[curr++] = AT_NORMAL;
|
|
linebuf[curr] = '\b';
|
|
attr[curr++] = AT_NORMAL;
|
|
}
|
|
linebuf[curr] = '\0';
|
|
attr[curr] = AT_NORMAL;
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
public void
|
|
set_status_col(c)
|
|
char c;
|
|
{
|
|
linebuf[0] = c;
|
|
attr[0] = AT_NORMAL|AT_HILITE;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
{
|
|
if (is_null_line)
|
|
{
|
|
/*
|
|
* If there is no current line, we pretend the line is
|
|
* either "~" or "", depending on the "twiddle" flag.
|
|
*/
|
|
if (twiddle)
|
|
{
|
|
if (i == 0)
|
|
{
|
|
*ap = AT_BOLD;
|
|
return '~';
|
|
}
|
|
--i;
|
|
}
|
|
/* Make sure we're back to AT_NORMAL before the '\n'. */
|
|
*ap = AT_NORMAL;
|
|
return i ? '\0' : '\n';
|
|
}
|
|
|
|
*ap = attr[i];
|
|
return (linebuf[i] & 0xFF);
|
|
}
|
|
|
|
/*
|
|
* 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, line_lenp)
|
|
POSITION curr_pos;
|
|
char **linep;
|
|
int *line_lenp;
|
|
{
|
|
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 || ABORT_SIGS())
|
|
{
|
|
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;
|
|
if (line_lenp != NULL)
|
|
*line_lenp = n;
|
|
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, line_lenp)
|
|
POSITION curr_pos;
|
|
char **linep;
|
|
int *line_lenp;
|
|
{
|
|
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' || ABORT_SIGS())
|
|
{
|
|
/*
|
|
* 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];
|
|
if (line_lenp != NULL)
|
|
*line_lenp = size_linebuf - 1 - n;
|
|
return (new_pos);
|
|
}
|