621 lines
11 KiB
C
621 lines
11 KiB
C
/*
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* Copyright (C) 1984-2002 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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* High level routines dealing with the output to the screen.
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*/
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#include "less.h"
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#if MSDOS_COMPILER==WIN32C
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#include "windows.h"
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#endif
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public int errmsgs; /* Count of messages displayed by error() */
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public int need_clr;
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public int final_attr;
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extern int sigs;
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extern int sc_width;
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extern int so_s_width, so_e_width;
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extern int screen_trashed;
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extern int any_display;
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extern int is_tty;
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#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
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extern int ctldisp;
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extern int nm_fg_color, nm_bg_color;
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extern int bo_fg_color, bo_bg_color;
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extern int ul_fg_color, ul_bg_color;
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extern int so_fg_color, so_bg_color;
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extern int bl_fg_color, bl_bg_color;
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#endif
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/*
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* Display the line which is in the line buffer.
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*/
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public void
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put_line()
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{
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register int c;
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register int i;
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int a;
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int curr_attr;
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if (ABORT_SIGS())
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{
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/*
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* Don't output if a signal is pending.
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*/
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screen_trashed = 1;
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return;
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}
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curr_attr = AT_NORMAL;
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for (i = 0; (c = gline(i, &a)) != '\0'; i++)
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{
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if (a != curr_attr)
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{
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/*
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* Changing attributes.
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* Display the exit sequence for the old attribute
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* and the enter sequence for the new one.
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*/
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switch (curr_attr)
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{
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case AT_UNDERLINE: ul_exit(); break;
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case AT_BOLD: bo_exit(); break;
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case AT_BLINK: bl_exit(); break;
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case AT_STANDOUT: so_exit(); break;
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}
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switch (a)
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{
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case AT_UNDERLINE: ul_enter(); break;
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case AT_BOLD: bo_enter(); break;
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case AT_BLINK: bl_enter(); break;
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case AT_STANDOUT: so_enter(); break;
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}
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curr_attr = a;
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}
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if (curr_attr == AT_INVIS)
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continue;
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if (c == '\b')
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putbs();
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else
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putchr(c);
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}
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switch (curr_attr)
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{
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case AT_UNDERLINE: ul_exit(); break;
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case AT_BOLD: bo_exit(); break;
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case AT_BLINK: bl_exit(); break;
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case AT_STANDOUT: so_exit(); break;
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}
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final_attr = curr_attr;
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}
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static char obuf[OUTBUF_SIZE];
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static char *ob = obuf;
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/*
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* Flush buffered output.
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*
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* If we haven't displayed any file data yet,
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* output messages on error output (file descriptor 2),
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* otherwise output on standard output (file descriptor 1).
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*
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* This has the desirable effect of producing all
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* error messages on error output if standard output
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* is directed to a file. It also does the same if
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* we never produce any real output; for example, if
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* the input file(s) cannot be opened. If we do
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* eventually produce output, code in edit() makes
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* sure these messages can be seen before they are
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* overwritten or scrolled away.
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*/
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public void
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flush()
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{
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register int n;
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register int fd;
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n = ob - obuf;
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if (n == 0)
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return;
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#if MSDOS_COMPILER==WIN32C
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if (is_tty && any_display)
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{
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char *op;
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DWORD nwritten = 0;
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CONSOLE_SCREEN_BUFFER_INFO scr;
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int row;
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int col;
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int olen;
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extern HANDLE con_out;
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olen = ob - obuf;
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/*
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* There is a bug in Win32 WriteConsole() if we're
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* writing in the last cell with a different color.
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* To avoid color problems in the bottom line,
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* we scroll the screen manually, before writing.
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*/
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GetConsoleScreenBufferInfo(con_out, &scr);
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col = scr.dwCursorPosition.X;
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row = scr.dwCursorPosition.Y;
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for (op = obuf; op < obuf + olen; op++)
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{
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if (*op == '\n')
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{
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col = 0;
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row++;
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} else if (*op == '\r')
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{
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col = 0;
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} else
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{
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col++;
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if (col >= sc_width)
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{
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col = 0;
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row++;
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}
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}
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}
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if (row > scr.srWindow.Bottom)
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win32_scroll_up(row - scr.srWindow.Bottom);
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WriteConsole(con_out, obuf, olen, &nwritten, NULL);
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ob = obuf;
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return;
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}
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#else
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#if MSDOS_COMPILER==MSOFTC
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if (is_tty && any_display)
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{
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*ob = '\0';
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_outtext(obuf);
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ob = obuf;
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return;
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}
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#else
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#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
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if (is_tty && any_display)
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{
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*ob = '\0';
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if (ctldisp != OPT_ONPLUS)
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cputs(obuf);
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else
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{
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/*
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* Look for SGR escape sequences, and convert them
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* to color commands. Replace bold, underline,
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* and italic escapes into colors specified via
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* the -D command-line option.
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*/
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char *anchor, *p, *p_next;
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int buflen = ob - obuf;
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unsigned char fg, bg, norm_attr;
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/*
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* Only dark colors mentioned here, so that
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* bold has visible effect.
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*/
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static enum COLORS screen_color[] = {
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BLACK, RED, GREEN, BROWN,
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BLUE, MAGENTA, CYAN, LIGHTGRAY
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};
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/* Normal text colors are used as baseline. */
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bg = nm_bg_color & 0xf;
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fg = nm_fg_color & 0xf;
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norm_attr = (bg << 4) | fg;
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for (anchor = p_next = obuf;
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(p_next = memchr (p_next, ESC,
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buflen - (p_next - obuf)))
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!= NULL; )
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{
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p = p_next;
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/*
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* Handle the null escape sequence
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* (ESC-[m), which is used to restore
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* the original color.
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*/
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if (p[1] == '[' && is_ansi_end(p[2]))
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{
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textattr(norm_attr);
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p += 3;
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anchor = p_next = p;
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continue;
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}
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if (p[1] == '[') /* "Esc-[" sequence */
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{
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/*
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* If some chars seen since
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* the last escape sequence,
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* write it out to the screen
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* using current text attributes.
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*/
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if (p > anchor)
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{
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*p = '\0';
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cputs (anchor);
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*p = ESC;
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anchor = p;
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}
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p += 2;
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p_next = p;
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while (!is_ansi_end(*p))
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{
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char *q;
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long code = strtol(p, &q, 10);
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if (!*q)
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{
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/*
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* Incomplete sequence.
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* Leave it unprocessed
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* in the buffer.
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*/
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int slop = q - anchor;
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strcpy(obuf, anchor);
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ob = &obuf[slop];
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return;
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}
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if (q == p
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|| code > 49 || code < 0
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|| (!is_ansi_end(*q)
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&& *q != ';'))
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{
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p_next = q;
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break;
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}
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if (*q == ';')
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q++;
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switch (code)
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{
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case 1: /* bold on */
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fg = bo_fg_color;
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bg = bo_bg_color;
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break;
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case 3: /* italic on */
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fg = so_fg_color;
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bg = so_bg_color;
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break;
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case 4: /* underline on */
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fg = ul_fg_color;
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bg = ul_bg_color;
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break;
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case 8: /* concealed on */
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fg = (bg & 7) | 8;
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break;
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case 0: /* all attrs off */
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case 22:/* bold off */
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case 23:/* italic off */
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case 24:/* underline off */
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fg = nm_fg_color;
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bg = nm_bg_color;
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break;
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case 30: case 31: case 32:
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case 33: case 34: case 35:
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case 36: case 37:
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fg = (fg & 8) | (screen_color[code - 30]);
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break;
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case 39: /* default fg */
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fg = nm_fg_color;
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break;
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case 40: case 41: case 42:
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case 43: case 44: case 45:
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case 46: case 47:
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bg = (bg & 8) | (screen_color[code - 40]);
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break;
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case 49: /* default fg */
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bg = nm_bg_color;
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break;
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}
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p = q;
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}
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if (is_ansi_end(*p) && p > p_next)
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{
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bg &= 15;
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fg &= 15;
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textattr ((bg << 4)| fg);
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p_next = anchor = p + 1;
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} else
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break;
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} else
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p_next++;
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}
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/* Output what's left in the buffer. */
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cputs (anchor);
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}
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ob = obuf;
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return;
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}
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#endif
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#endif
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#endif
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fd = (any_display) ? 1 : 2;
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if (write(fd, obuf, n) != n)
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screen_trashed = 1;
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ob = obuf;
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}
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/*
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* Output a character.
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*/
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public int
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putchr(c)
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int c;
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{
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if (need_clr)
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{
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need_clr = 0;
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clear_bot();
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}
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#if MSDOS_COMPILER
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if (c == '\n' && is_tty)
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{
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/* remove_top(1); */
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putchr('\r');
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}
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#else
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#ifdef _OSK
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if (c == '\n' && is_tty) /* In OS-9, '\n' == 0x0D */
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putchr(0x0A);
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#endif
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#endif
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/*
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* Some versions of flush() write to *ob, so we must flush
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* when we are still one char from the end of obuf.
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*/
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if (ob >= &obuf[sizeof(obuf)-1])
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flush();
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*ob++ = c;
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return (c);
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}
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/*
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* Output a string.
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*/
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public void
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putstr(s)
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register char *s;
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{
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while (*s != '\0')
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putchr(*s++);
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}
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/*
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* Convert an integral type to a string.
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*/
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#define TYPE_TO_A_FUNC(funcname, type) \
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void funcname(num, buf) \
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type num; \
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char *buf; \
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{ \
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int neg = (num < 0); \
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char tbuf[INT_STRLEN_BOUND(num)+2]; \
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register char *s = tbuf + sizeof(tbuf); \
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if (neg) num = -num; \
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*--s = '\0'; \
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do { \
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*--s = (num % 10) + '0'; \
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} while ((num /= 10) != 0); \
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if (neg) *--s = '-'; \
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strcpy(buf, s); \
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}
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TYPE_TO_A_FUNC(postoa, POSITION)
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TYPE_TO_A_FUNC(linenumtoa, LINENUM)
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TYPE_TO_A_FUNC(inttoa, int)
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/*
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* Output an integer in a given radix.
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*/
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static int
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iprint_int(num)
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int num;
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{
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char buf[INT_STRLEN_BOUND(num)];
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inttoa(num, buf);
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putstr(buf);
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return (strlen(buf));
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}
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/*
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* Output a line number in a given radix.
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*/
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static int
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iprint_linenum(num)
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LINENUM num;
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{
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char buf[INT_STRLEN_BOUND(num)];
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linenumtoa(num, buf);
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putstr(buf);
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return (strlen(buf));
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}
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/*
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* This function implements printf-like functionality
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* using a more portable argument list mechanism than printf's.
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*/
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static int
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less_printf(fmt, parg)
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register char *fmt;
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PARG *parg;
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{
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register char *s;
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register int col;
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col = 0;
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while (*fmt != '\0')
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{
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if (*fmt != '%')
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{
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putchr(*fmt++);
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col++;
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} else
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{
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++fmt;
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switch (*fmt++)
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{
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case 's':
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s = parg->p_string;
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parg++;
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while (*s != '\0')
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{
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putchr(*s++);
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col++;
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}
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break;
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case 'd':
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col += iprint_int(parg->p_int);
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parg++;
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break;
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case 'n':
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col += iprint_linenum(parg->p_linenum);
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parg++;
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break;
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}
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}
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}
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return (col);
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}
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|
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/*
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* Get a RETURN.
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* If some other non-trivial char is pressed, unget it, so it will
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* become the next command.
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*/
|
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public void
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get_return()
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{
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int c;
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|
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#if ONLY_RETURN
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while ((c = getchr()) != '\n' && c != '\r')
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bell();
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#else
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c = getchr();
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if (c != '\n' && c != '\r' && c != ' ' && c != READ_INTR)
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ungetcc(c);
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#endif
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}
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|
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/*
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* Output a message in the lower left corner of the screen
|
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* and wait for carriage return.
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*/
|
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public void
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error(fmt, parg)
|
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char *fmt;
|
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PARG *parg;
|
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{
|
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int col = 0;
|
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static char return_to_continue[] = " (press RETURN)";
|
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|
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errmsgs++;
|
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|
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if (any_display && is_tty)
|
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{
|
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clear_bot();
|
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so_enter();
|
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col += so_s_width;
|
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}
|
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|
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col += less_printf(fmt, parg);
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|
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if (!(any_display && is_tty))
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{
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putchr('\n');
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return;
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}
|
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|
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putstr(return_to_continue);
|
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so_exit();
|
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col += sizeof(return_to_continue) + so_e_width;
|
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|
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get_return();
|
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lower_left();
|
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|
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if (col >= sc_width)
|
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/*
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|
* Printing the message has probably scrolled the screen.
|
|
* {{ Unless the terminal doesn't have auto margins,
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* in which case we just hammered on the right margin. }}
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*/
|
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screen_trashed = 1;
|
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|
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flush();
|
|
}
|
|
|
|
static char intr_to_abort[] = "... (interrupt to abort)";
|
|
|
|
/*
|
|
* Output a message in the lower left corner of the screen
|
|
* and don't wait for carriage return.
|
|
* Usually used to warn that we are beginning a potentially
|
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* time-consuming operation.
|
|
*/
|
|
public void
|
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ierror(fmt, parg)
|
|
char *fmt;
|
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PARG *parg;
|
|
{
|
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clear_bot();
|
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so_enter();
|
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(void) less_printf(fmt, parg);
|
|
putstr(intr_to_abort);
|
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so_exit();
|
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flush();
|
|
need_clr = 1;
|
|
}
|
|
|
|
/*
|
|
* Output a message in the lower left corner of the screen
|
|
* and return a single-character response.
|
|
*/
|
|
public int
|
|
query(fmt, parg)
|
|
char *fmt;
|
|
PARG *parg;
|
|
{
|
|
register int c;
|
|
int col = 0;
|
|
|
|
if (any_display && is_tty)
|
|
clear_bot();
|
|
|
|
(void) less_printf(fmt, parg);
|
|
c = getchr();
|
|
|
|
if (!(any_display && is_tty))
|
|
{
|
|
putchr('\n');
|
|
return (c);
|
|
}
|
|
|
|
lower_left();
|
|
if (col >= sc_width)
|
|
screen_trashed = 1;
|
|
flush();
|
|
|
|
return (c);
|
|
}
|