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Diffstat (limited to 'usr.bin/more/output.c')
| -rw-r--r-- | usr.bin/more/output.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/usr.bin/more/output.c b/usr.bin/more/output.c new file mode 100644 index 0000000..c721f4e --- /dev/null +++ b/usr.bin/more/output.c @@ -0,0 +1,252 @@ +/* + * Copyright (c) 1988 Mark Nudleman + * Copyright (c) 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char sccsid[] = "@(#)output.c 8.1 (Berkeley) 6/6/93"; +#endif /* not lint */ + +/* + * High level routines dealing with the output to the screen. + */ + +#include <stdio.h> +#include <less.h> + +int errmsgs; /* Count of messages displayed by error() */ + +extern int sigs; +extern int sc_width, sc_height; +extern int ul_width, ue_width; +extern int so_width, se_width; +extern int bo_width, be_width; +extern int tabstop; +extern int screen_trashed; +extern int any_display; +extern char *line; + +/* display the line which is in the line buffer. */ +put_line() +{ + register char *p; + register int c; + register int column; + extern int auto_wrap, ignaw; + + if (sigs) + { + /* + * Don't output if a signal is pending. + */ + screen_trashed = 1; + return; + } + + if (line == NULL) + line = ""; + + column = 0; + for (p = line; *p != '\0'; p++) + { + switch (c = *p) + { + case UL_CHAR: + ul_enter(); + column += ul_width +1; + break; + case UE_CHAR: + ul_exit(); + column += ue_width; + break; + case BO_CHAR: + bo_enter(); + column += bo_width +1; + break; + case BE_CHAR: + bo_exit(); + column += be_width; + break; + case '\t': + do + { + putchr(' '); + column++; + } while ((column % tabstop) != 0); + break; + case '\b': + putbs(); + column--; + break; + default: + if (c & 0200) + { + /* + * Control characters arrive here as the + * normal character [CARAT_CHAR(c)] with + * the 0200 bit set. See pappend(). + */ + putchr('^'); + putchr(c & 0177); + column += 2; + } else + { + putchr(c); + column++; + } + } + } + if (column < sc_width || !auto_wrap || ignaw) + putchr('\n'); +} + +static char obuf[1024]; +static char *ob = obuf; + +/* + * Flush buffered output. + */ +flush() +{ + register int n; + + n = ob - obuf; + if (n == 0) + return; + if (write(1, obuf, n) != n) + screen_trashed = 1; + ob = obuf; +} + +/* + * Purge any pending output. + */ +purge() +{ + + ob = obuf; +} + +/* + * Output a character. + */ +putchr(c) + int c; +{ + if (ob >= &obuf[sizeof(obuf)]) + flush(); + *ob++ = c; +} + +/* + * Output a string. + */ +putstr(s) + register char *s; +{ + while (*s != '\0') + putchr(*s++); +} + +int cmdstack; +static char return_to_continue[] = "(press RETURN)"; + +/* + * Output a message in the lower left corner of the screen + * and wait for carriage return. + */ +error(s) + char *s; +{ + int ch; + + ++errmsgs; + if (!any_display) { + /* + * Nothing has been displayed yet. Output this message on + * error output (file descriptor 2) and don't wait for a + * keystroke to continue. + * + * This has the desirable effect of producing all error + * messages on error output if standard output is directed + * to a file. It also does the same if we never produce + * any real output; for example, if the input file(s) cannot + * be opened. If we do eventually produce output, code in + * edit() makes sure these messages can be seen before they + * are overwritten or scrolled away. + */ + (void)write(2, s, strlen(s)); + (void)write(2, "\n", 1); + return; + } + + lower_left(); + clear_eol(); + so_enter(); + if (s) { + putstr(s); + putstr(" "); + } + putstr(return_to_continue); + so_exit(); + + if ((ch = getchr()) != '\n') { + if (ch == 'q') + quit(); + cmdstack = ch; + } + lower_left(); + + if (strlen(s) + sizeof(return_to_continue) + + so_width + se_width + 1 > sc_width) + /* + * Printing the message has probably scrolled the screen. + * {{ Unless the terminal doesn't have auto margins, + * in which case we just hammered on the right margin. }} + */ + repaint(); + flush(); +} + +static char intr_to_abort[] = "... (interrupt to abort)"; + +ierror(s) + char *s; +{ + lower_left(); + clear_eol(); + so_enter(); + putstr(s); + putstr(intr_to_abort); + so_exit(); + flush(); +} |
