1501 lines
32 KiB
C
1501 lines
32 KiB
C
/*
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* Copyright (C) 1984-2021 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, 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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#include "position.h"
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#if MSDOS_COMPILER==WIN32C
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#endif
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#define MAX_PFX_WIDTH (MAX_LINENUM_WIDTH + MAX_STATUSCOL_WIDTH + 1)
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static struct {
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char *buf; /* Buffer which holds the current output line */
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int *attr; /* Parallel to buf, to hold attributes */
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int print; /* Index in buf of first printable char */
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int end; /* Number of chars in buf */
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char pfx[MAX_PFX_WIDTH]; /* Holds status column and line number */
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int pfx_attr[MAX_PFX_WIDTH];
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int pfx_end; /* Number of chars in pfx */
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} linebuf;
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static struct {
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char *buf;
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int size;
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int end;
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} shifted_ansi;
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public int size_linebuf = 0; /* Size of line buffer (and attr buffer) */
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static struct ansi_state *line_ansi = NULL;
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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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public POSITION highest_hilite; /* Pos of last hilite in file found so far */
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static int end_column; /* Printable length, accounting for backspaces, etc. */
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static int right_curr;
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static int right_column;
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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 LWCHAR 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 LESSPARAMS ((int a));
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static int attr_ewidth LESSPARAMS ((int a));
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static int do_append LESSPARAMS ((LWCHAR ch, char *rep, POSITION pos));
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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 status_col_width;
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extern int linenum_width;
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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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extern char rscroll_char;
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extern int rscroll_attr;
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extern int use_color;
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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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/* Configurable color map */
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static char color_map[AT_NUM_COLORS][12] = {
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"Wm", /* AT_COLOR_ATTN */
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"kR", /* AT_COLOR_BIN */
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"kR", /* AT_COLOR_CTRL */
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"kY", /* AT_COLOR_ERROR */
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"c", /* AT_COLOR_LINENUM */
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"Wb", /* AT_COLOR_MARK */
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"kC", /* AT_COLOR_PROMPT */
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"kc", /* AT_COLOR_RSCROLL */
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"kG", /* AT_COLOR_SEARCH */
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"", /* AT_UNDERLINE */
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"", /* AT_BOLD */
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"", /* AT_BLINK */
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"", /* AT_STANDOUT */
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};
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/* State while processing an ANSI escape sequence */
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struct ansi_state {
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int hindex; /* Index into hyperlink prefix */
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int hlink; /* Processing hyperlink address? */
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int prev_esc; /* Prev char was ESC (to detect ESC-\ seq) */
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};
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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(VOID_PARAM)
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{
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end_ansi_chars = lgetenv("LESSANSIENDCHARS");
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if (isnullenv(end_ansi_chars))
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end_ansi_chars = "m";
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mid_ansi_chars = lgetenv("LESSANSIMIDCHARS");
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if (isnullenv(mid_ansi_chars))
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mid_ansi_chars = "0123456789:;[?!\"'#%()*+ ";
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linebuf.buf = (char *) ecalloc(LINEBUF_SIZE, sizeof(char));
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linebuf.attr = (int *) ecalloc(LINEBUF_SIZE, sizeof(int));
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size_linebuf = LINEBUF_SIZE;
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shifted_ansi.buf = NULL;
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shifted_ansi.size = 0;
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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(VOID_PARAM)
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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.buf, new_size);
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int *new_attr = (int *) realloc(linebuf.attr, new_size*sizeof(int));
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#else
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char *new_buf = (char *) calloc(new_size, sizeof(char));
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int *new_attr = (int *) calloc(new_size, sizeof(int));
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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 just calloc'd the buffers; copy the old contents.
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*/
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memcpy(new_buf, linebuf.buf, size_linebuf * sizeof(char));
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memcpy(new_attr, linebuf.attr, size_linebuf * sizeof(int));
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free(linebuf.attr);
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free(linebuf.buf);
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#endif
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linebuf.buf = new_buf;
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linebuf.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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*/
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static void
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inc_end_column(w)
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int w;
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{
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if (end_column > right_column && w > 0)
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{
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right_column = end_column;
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right_curr = linebuf.end;
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}
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end_column += w;
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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(VOID_PARAM)
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{
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linebuf.print = 6; /* big enough for longest UTF-8 sequence */
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linebuf.pfx_end = 0;
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for (linebuf.end = 0; linebuf.end < linebuf.print; linebuf.end++)
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{
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linebuf.buf[linebuf.end] = '\0';
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linebuf.attr[linebuf.end] = 0;
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}
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end_column = 0;
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right_curr = 0;
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right_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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shifted_ansi.end = 0;
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}
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/*
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* Set a character in the line buffer.
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*/
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static void
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set_linebuf(n, ch, attr)
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int n;
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char ch;
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int attr;
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{
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linebuf.buf[n] = ch;
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linebuf.attr[n] = attr;
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}
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/*
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* Append a character to the line buffer.
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*/
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static void
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add_linebuf(ch, attr, w)
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char ch;
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int attr;
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int w;
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{
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set_linebuf(linebuf.end++, ch, attr);
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inc_end_column(w);
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}
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/*
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* Set a character in the line prefix buffer.
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*/
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static void
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set_pfx(n, ch, attr)
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int n;
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char ch;
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int attr;
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{
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linebuf.pfx[n] = ch;
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linebuf.pfx_attr[n] = attr;
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}
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/*
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* Append a character to the line prefix buffer.
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*/
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static void
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add_pfx(ch, attr)
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char ch;
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int attr;
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{
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set_pfx(linebuf.pfx_end++, ch, attr);
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}
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/*
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* Insert the status column and line number into the line buffer.
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*/
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public void
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plinestart(pos)
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POSITION pos;
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{
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LINENUM linenum = 0;
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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 plinestart 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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int a = AT_NORMAL;
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char c = posmark(pos);
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if (c != 0)
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a |= AT_HILITE|AT_COLOR_MARK;
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else
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{
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c = ' ';
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if (start_attnpos != NULL_POSITION &&
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pos >= start_attnpos && pos <= end_attnpos)
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a |= AT_HILITE|AT_COLOR_ATTN;
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}
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add_pfx(c, a); /* column 0: status */
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while (linebuf.pfx_end < status_col_width)
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add_pfx(' ', AT_NORMAL);
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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(linenum) + 2];
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int len;
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linenumtoa(linenum, buf);
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len = (int) strlen(buf);
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for (i = 0; i < linenum_width - len; i++)
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add_pfx(' ', AT_NORMAL);
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for (i = 0; i < len; i++)
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add_pfx(buf[i], AT_NORMAL|AT_COLOR_LINENUM);
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add_pfx(' ', AT_NORMAL);
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}
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end_column = linebuf.pfx_end;
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}
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/*
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* Return the width of the line prefix (status column and line number).
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* {{ Actual line number can be wider than linenum_width. }}
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*/
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public int
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line_pfx_width(VOID_PARAM)
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{
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int width = 0;
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if (status_col)
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width += status_col_width;
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if (linenums == OPT_ONPLUS)
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width += linenum_width + 1;
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return width;
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}
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/*
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* Add char to the shifted_ansi buffer.
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*/
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static void
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add_ansi(ch)
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char ch;
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{
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if (shifted_ansi.end == shifted_ansi.size)
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{
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/* Expand shifted_ansi buffer. */
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int size = (shifted_ansi.size == 0) ? 8 : shifted_ansi.size * 2;
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char *buf = (char *) ecalloc(size, sizeof(char));
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memcpy(buf, shifted_ansi.buf, shifted_ansi.size);
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if (shifted_ansi.buf != NULL) free(shifted_ansi.buf);
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shifted_ansi.buf = buf;
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shifted_ansi.size = size;
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}
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shifted_ansi.buf[shifted_ansi.end++] = ch;
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}
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/*
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* Shift line left so that the last char is just to the left
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* of the first visible column.
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*/
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public void
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pshift_all(VOID_PARAM)
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{
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int i;
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for (i = linebuf.print; i < linebuf.end; i++)
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if (linebuf.attr[i] == AT_ANSI)
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add_ansi(linebuf.buf[i]);
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linebuf.end = linebuf.print;
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end_column = linebuf.pfx_end;
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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 after prev_ch.
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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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public int
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pwidth(ch, a, prev_ch, prev_a)
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LWCHAR ch;
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int a;
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LWCHAR prev_ch;
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int prev_a;
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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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/*
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* Backspace moves backwards one or two positions.
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*/
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if (prev_a & (AT_ANSI|AT_BINARY))
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return strlen(prchar('\b'));
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return (utf_mode && is_wide_char(prev_ch)) ? -2 : -1;
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}
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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 end_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 (linebuf.end > 0 && !is_at_equiv(linebuf.attr[linebuf.end-1], a))
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w += attr_ewidth(linebuf.attr[linebuf.end-1]);
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if (apply_at_specials(a) != AT_NORMAL &&
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(linebuf.end == 0 || !is_at_equiv(linebuf.attr[linebuf.end-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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*/
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static int
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backc(VOID_PARAM)
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{
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LWCHAR ch;
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char *p;
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if (linebuf.end == 0)
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return (0);
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p = &linebuf.buf[linebuf.end];
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ch = step_char(&p, -1, linebuf.buf);
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/* Skip back to the next nonzero-width char. */
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while (p > linebuf.buf)
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{
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LWCHAR prev_ch;
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int width;
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linebuf.end = (int) (p - linebuf.buf);
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prev_ch = step_char(&p, -1, linebuf.buf);
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width = pwidth(ch, linebuf.attr[linebuf.end], prev_ch, linebuf.attr[linebuf.end-1]);
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end_column -= width;
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/* {{ right_column? }} */
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if (width > 0)
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break;
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ch = prev_ch;
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}
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return (1);
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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);
|
|
}
|
|
|
|
/*
|
|
* 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;";
|
|
if (ch == 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);
|
|
}
|
|
|
|
/*
|
|
* 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 hl_attr = is_hilited_attr(pos, pos+1, 0, &matches);
|
|
if (hl_attr)
|
|
{
|
|
/*
|
|
* This character should be highlighted.
|
|
* Override the attribute passed in.
|
|
*/
|
|
if (a != AT_ANSI)
|
|
{
|
|
if (highest_hilite != NULL_POSITION && pos > highest_hilite)
|
|
highest_hilite = pos;
|
|
a |= hl_attr;
|
|
}
|
|
}
|
|
}
|
|
#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 (ctldisp != OPT_ON && end_column - cshift + 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 (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.buf[i], AT_ANSI, 0);
|
|
shifted_ansi.end = 0;
|
|
}
|
|
/* 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)
|
|
add_ansi(ch); /* Save ANSI attributes */
|
|
if (linebuf.end > linebuf.print)
|
|
{
|
|
/* Shift left enough to put last byte of this char at print-1. */
|
|
memcpy(&linebuf.buf[0], &linebuf.buf[replen], linebuf.print);
|
|
memcpy(&linebuf.attr[0], &linebuf.attr[replen], linebuf.print);
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
{
|
|
char *s;
|
|
|
|
/*
|
|
* Convert to printable representation.
|
|
*/
|
|
s = prchar(c);
|
|
for ( ; *s != 0; s++)
|
|
STORE_CHAR(*s, AT_BINARY|AT_COLOR_CTRL, 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)
|
|
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)
|
|
goto retry;
|
|
}
|
|
}
|
|
if (r)
|
|
{
|
|
/* How many chars should caller back up? */
|
|
r = (!utf_mode) ? 1 : mbc_buf_index;
|
|
}
|
|
return (r);
|
|
}
|
|
|
|
static int
|
|
store_control_char(ch, rep, pos)
|
|
LWCHAR ch;
|
|
char *rep;
|
|
POSITION pos;
|
|
{
|
|
if (ctldisp == OPT_ON)
|
|
{
|
|
/* Output the character itself. */
|
|
STORE_CHAR(ch, AT_NORMAL, rep, pos);
|
|
} else
|
|
{
|
|
/* Output a printable representation of the character. */
|
|
STORE_PRCHAR((char) ch, pos);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
store_ansi(ch, rep, pos)
|
|
LWCHAR ch;
|
|
char *rep;
|
|
POSITION pos;
|
|
{
|
|
switch (ansi_step(line_ansi, ch))
|
|
{
|
|
case ANSI_MID:
|
|
STORE_CHAR(ch, AT_ANSI, rep, pos);
|
|
break;
|
|
case ANSI_END:
|
|
STORE_CHAR(ch, AT_ANSI, rep, pos);
|
|
ansi_done(line_ansi);
|
|
line_ansi = NULL;
|
|
break;
|
|
case ANSI_ERR: {
|
|
/* Remove whole unrecognized sequence. */
|
|
char *start = (cshift < hshift) ? shifted_ansi.buf : linebuf.buf;
|
|
int *end = (cshift < hshift) ? &shifted_ansi.end : &linebuf.end;
|
|
char *p = start + *end;
|
|
LWCHAR bch;
|
|
do {
|
|
bch = step_char(&p, -1, start);
|
|
} while (p > start && !IS_CSI_START(bch));
|
|
*end = (int) (p - start);
|
|
ansi_done(line_ansi);
|
|
line_ansi = NULL;
|
|
break; }
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
store_bs(ch, rep, pos)
|
|
LWCHAR ch;
|
|
char *rep;
|
|
POSITION pos;
|
|
{
|
|
if (bs_mode == BS_CONTROL)
|
|
return store_control_char(ch, rep, pos);
|
|
if (linebuf.end > 0 &&
|
|
((linebuf.end <= linebuf.print && linebuf.buf[linebuf.end-1] == '\0') ||
|
|
(linebuf.end > 0 && linebuf.attr[linebuf.end - 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;
|
|
}
|
|
|
|
static int
|
|
do_append(ch, rep, pos)
|
|
LWCHAR ch;
|
|
char *rep;
|
|
POSITION pos;
|
|
{
|
|
int a = AT_NORMAL;
|
|
|
|
if (ctldisp == OPT_ONPLUS && line_ansi == NULL)
|
|
line_ansi = ansi_start(ch);
|
|
|
|
if (line_ansi != NULL)
|
|
return store_ansi(ch, rep, pos);
|
|
|
|
if (ch == '\b')
|
|
return store_bs(ch, rep, pos);
|
|
|
|
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 replacing the character in the buffer.
|
|
*/
|
|
LWCHAR prev_ch;
|
|
overstrike = utf_mode ? -1 : 0;
|
|
if (utf_mode)
|
|
{
|
|
/* To be correct, this must be a base character. */
|
|
prev_ch = get_wchar(&linebuf.buf[linebuf.end]);
|
|
} else
|
|
{
|
|
prev_ch = (unsigned char) linebuf.buf[linebuf.end];
|
|
}
|
|
a = linebuf.attr[linebuf.end];
|
|
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.buf[linebuf.end];
|
|
} 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.buf[linebuf.end]), 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:
|
|
return store_control_char(ch, rep, pos);
|
|
case BS_NORMAL:
|
|
case BS_SPECIAL:
|
|
STORE_TAB(a, pos);
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
if ((!utf_mode || is_ascii_char(ch)) && control_char((char)ch))
|
|
{
|
|
return store_control_char(ch, rep, pos);
|
|
} else if (utf_mode && ctldisp != OPT_ON && is_ubin_char(ch))
|
|
{
|
|
char *s = prutfchar(ch);
|
|
for ( ; *s != 0; s++)
|
|
STORE_CHAR(*s, AT_BINARY, NULL, pos);
|
|
} else
|
|
{
|
|
STORE_CHAR(ch, a, rep, pos);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
public int
|
|
pflushmbc(VOID_PARAM)
|
|
{
|
|
int r = 0;
|
|
|
|
if (mbc_buf_len > 0)
|
|
{
|
|
/* Flush incomplete (truncated) sequence. */
|
|
r = flush_mbc_buf(mbc_pos);
|
|
mbc_buf_len = 0;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Switch to normal attribute at end of line.
|
|
*/
|
|
static void
|
|
add_attr_normal(VOID_PARAM)
|
|
{
|
|
char *p = "\033[m";
|
|
|
|
if (ctldisp != OPT_ONPLUS || !is_ansi_end('m'))
|
|
return;
|
|
for ( ; *p != '\0'; p++)
|
|
add_linebuf(*p, AT_ANSI, 0);
|
|
}
|
|
|
|
/*
|
|
* Terminate the line in the line buffer.
|
|
*/
|
|
public void
|
|
pdone(endline, chopped, forw)
|
|
int endline;
|
|
int chopped;
|
|
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);
|
|
|
|
if (chopped && rscroll_char)
|
|
{
|
|
/*
|
|
* Display the right scrolling char.
|
|
* If we've already filled the rightmost screen char
|
|
* (in the buffer), overwrite it.
|
|
*/
|
|
if (end_column >= sc_width + cshift)
|
|
{
|
|
/* We've already written in the rightmost char. */
|
|
end_column = right_column;
|
|
linebuf.end = right_curr;
|
|
}
|
|
add_attr_normal();
|
|
while (end_column < sc_width-1 + cshift)
|
|
{
|
|
/*
|
|
* Space to last (rightmost) char on screen.
|
|
* This may be necessary if the char we overwrote
|
|
* was double-width.
|
|
*/
|
|
add_linebuf(' ', rscroll_attr, 1);
|
|
}
|
|
/* Print rscroll char. It must be single-width. */
|
|
add_linebuf(rscroll_char, rscroll_attr, 1);
|
|
} else
|
|
{
|
|
add_attr_normal();
|
|
}
|
|
|
|
/*
|
|
* 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 (end_column < sc_width + cshift || !auto_wrap || (endline && ignaw) || ctldisp == OPT_ON)
|
|
{
|
|
add_linebuf('\n', AT_NORMAL, 0);
|
|
}
|
|
else if (ignaw && end_column >= sc_width + cshift && 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.
|
|
*/
|
|
add_linebuf(' ', AT_NORMAL, 1);
|
|
add_linebuf('\b', AT_NORMAL, -1);
|
|
}
|
|
set_linebuf(linebuf.end, '\0', AT_NORMAL);
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
public void
|
|
set_status_col(c, attr)
|
|
int c;
|
|
int attr;
|
|
{
|
|
set_pfx(0, c, attr);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
int i;
|
|
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';
|
|
}
|
|
|
|
if (i < linebuf.pfx_end)
|
|
{
|
|
*ap = linebuf.pfx_attr[i];
|
|
return linebuf.pfx[i];
|
|
}
|
|
i += linebuf.print - linebuf.pfx_end;
|
|
*ap = linebuf.attr[i];
|
|
return (linebuf.buf[i] & 0xFF);
|
|
}
|
|
|
|
/*
|
|
* Indicate that there is no current line.
|
|
*/
|
|
public void
|
|
null_line(VOID_PARAM)
|
|
{
|
|
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;
|
|
{
|
|
int n;
|
|
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.buf[n++] = c;
|
|
c = ch_forw_get();
|
|
}
|
|
linebuf.buf[n] = '\0';
|
|
if (linep != NULL)
|
|
*linep = linebuf.buf;
|
|
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;
|
|
{
|
|
int n;
|
|
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.buf[--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.buf + old_size_linebuf - 1,
|
|
to = linebuf.buf + size_linebuf - 1;
|
|
fm >= linebuf.buf; fm--, to--)
|
|
*to = *fm;
|
|
n = size_linebuf - old_size_linebuf;
|
|
}
|
|
linebuf.buf[--n] = c;
|
|
}
|
|
if (linep != NULL)
|
|
*linep = &linebuf.buf[n];
|
|
if (line_lenp != NULL)
|
|
*line_lenp = size_linebuf - 1 - n;
|
|
return (new_pos);
|
|
}
|
|
|
|
/*
|
|
* Find the shift necessary to show the end of the longest displayed line.
|
|
*/
|
|
public int
|
|
rrshift(VOID_PARAM)
|
|
{
|
|
POSITION pos;
|
|
int save_width;
|
|
int line;
|
|
int longest = 0;
|
|
|
|
save_width = sc_width;
|
|
sc_width = INT_MAX;
|
|
pos = position(TOP);
|
|
for (line = 0; line < sc_height && pos != NULL_POSITION; line++)
|
|
{
|
|
pos = forw_line(pos);
|
|
if (end_column > longest)
|
|
longest = end_column;
|
|
}
|
|
sc_width = save_width;
|
|
if (longest < sc_width)
|
|
return 0;
|
|
return longest - sc_width;
|
|
}
|
|
|
|
/*
|
|
* Get the color_map index associated with a given attribute.
|
|
*/
|
|
static int
|
|
color_index(attr)
|
|
int attr;
|
|
{
|
|
if (use_color)
|
|
{
|
|
switch (attr & AT_COLOR)
|
|
{
|
|
case AT_COLOR_ATTN: return 0;
|
|
case AT_COLOR_BIN: return 1;
|
|
case AT_COLOR_CTRL: return 2;
|
|
case AT_COLOR_ERROR: return 3;
|
|
case AT_COLOR_LINENUM: return 4;
|
|
case AT_COLOR_MARK: return 5;
|
|
case AT_COLOR_PROMPT: return 6;
|
|
case AT_COLOR_RSCROLL: return 7;
|
|
case AT_COLOR_SEARCH: return 8;
|
|
}
|
|
}
|
|
if (attr & AT_UNDERLINE)
|
|
return 9;
|
|
if (attr & AT_BOLD)
|
|
return 10;
|
|
if (attr & AT_BLINK)
|
|
return 11;
|
|
if (attr & AT_STANDOUT)
|
|
return 12;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Set the color string to use for a given attribute.
|
|
*/
|
|
public int
|
|
set_color_map(attr, colorstr)
|
|
int attr;
|
|
char *colorstr;
|
|
{
|
|
int cx = color_index(attr);
|
|
if (cx < 0)
|
|
return -1;
|
|
if (strlen(colorstr)+1 > sizeof(color_map[cx]))
|
|
return -1;
|
|
if (*colorstr != '\0' && parse_color(colorstr, NULL, NULL) == CT_NULL)
|
|
return -1;
|
|
strcpy(color_map[cx], colorstr);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get the color string to use for a given attribute.
|
|
*/
|
|
public char *
|
|
get_color_map(attr)
|
|
int attr;
|
|
{
|
|
int cx = color_index(attr);
|
|
if (cx < 0)
|
|
return NULL;
|
|
return color_map[cx];
|
|
}
|