a5f0fb151d
distributed under your choice of the GPL or a BSD style license. Reviewed by: peter Obtained from: http://home.flash.net/~marknu/less/
462 lines
8.2 KiB
C
462 lines
8.2 KiB
C
/*
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* Copyright (C) 1984-2000 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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/*
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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 *p;
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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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DWORD nchars;
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COORD cpos;
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WORD nm_attr;
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int olen;
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extern HANDLE con_out;
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extern int nm_fg_color;
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extern int nm_bg_color;
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#define MAKEATTR(fg,bg) ((WORD)((fg)|((bg)<<4)))
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*ob = '\0';
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olen = ob - obuf;
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/*
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* To avoid color problems, if we're scrolling the screen,
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* we write only up to the char that causes the scroll,
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* (a newline or a char in the last column), then fill
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* the bottom line with the "normal" attribute, then
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* write the rest.
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* When Windows scrolls, it takes the attributes for the
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* new line from the first char of the (previously)
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* bottom line.
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*
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* {{ This still doesn't work correctly in all cases! }}
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*/
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nm_attr = MAKEATTR(nm_fg_color, nm_bg_color);
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for (op = obuf; *op != '\0'; )
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{
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GetConsoleScreenBufferInfo(con_out, &scr);
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/* Find the next newline. */
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p = strchr(op, '\n');
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if (p == NULL &&
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scr.dwCursorPosition.X + olen >= sc_width)
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{
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/*
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* No newline, but writing in the
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* last column causes scrolling.
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*/
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p = op + sc_width - scr.dwCursorPosition.X - 1;
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}
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if (scr.dwCursorPosition.Y != scr.srWindow.Bottom ||
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p == NULL)
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{
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/* Write the entire buffer. */
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WriteConsole(con_out, op, olen,
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&nwritten, NULL);
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op += olen;
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} else
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{
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/* Write only up to the scrolling char. */
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WriteConsole(con_out, op, p - op + 1,
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&nwritten, NULL);
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cpos.X = 0;
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cpos.Y = scr.dwCursorPosition.Y;
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FillConsoleOutputAttribute(con_out, nm_attr,
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sc_width, cpos, &nchars);
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olen -= p - op + 1;
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op = p + 1;
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}
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}
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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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cputs(obuf);
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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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* Output an integer in a given radix.
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*/
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static int
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iprintnum(num, radix)
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int num;
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int radix;
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{
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register char *s;
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int r;
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int neg;
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char buf[10];
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neg = (num < 0);
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if (neg)
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num = -num;
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s = buf;
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do
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{
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*s++ = (num % radix) + '0';
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} while ((num /= radix) != 0);
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if (neg)
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*s++ = '-';
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r = s - buf;
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while (s > buf)
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putchr(*--s);
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return (r);
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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 n;
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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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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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n = parg->p_int;
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parg++;
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col += iprintnum(n, 10);
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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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* 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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#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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* 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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errmsgs++;
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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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col += less_printf(fmt, parg);
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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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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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get_return();
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lower_left();
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if (col >= sc_width)
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/*
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* Printing the message has probably scrolled the screen.
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* {{ 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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flush();
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}
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static char intr_to_abort[] = "... (interrupt to abort)";
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/*
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* Output a message in the lower left corner of the screen
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* and don't wait for carriage return.
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* Usually used to warn that we are beginning a potentially
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* time-consuming operation.
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*/
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public void
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ierror(fmt, parg)
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char *fmt;
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PARG *parg;
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{
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clear_bot();
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so_enter();
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(void) less_printf(fmt, parg);
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putstr(intr_to_abort);
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so_exit();
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flush();
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need_clr = 1;
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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 return a single-character response.
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*/
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public int
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query(fmt, parg)
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char *fmt;
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PARG *parg;
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{
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register int c;
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int col = 0;
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if (any_display && is_tty)
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clear_bot();
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(void) less_printf(fmt, parg);
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c = getchr();
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if (!(any_display && is_tty))
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{
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putchr('\n');
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return (c);
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}
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lower_left();
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if (col >= sc_width)
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screen_trashed = 1;
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flush();
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return (c);
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}
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