549 lines
13 KiB
C
549 lines
13 KiB
C
/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Michael Rendell of the Memorial University of Newfoundland.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1990, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)col.c 8.5 (Berkeley) 5/4/95";
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#endif
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <err.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <wctype.h>
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#define BS '\b' /* backspace */
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#define TAB '\t' /* tab */
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#define SPACE ' ' /* space */
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#define NL '\n' /* newline */
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#define CR '\r' /* carriage return */
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#define ESC '\033' /* escape */
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#define SI '\017' /* shift in to normal character set */
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#define SO '\016' /* shift out to alternate character set */
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#define VT '\013' /* vertical tab (aka reverse line feed) */
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#define RLF '\007' /* ESC-07 reverse line feed */
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#define RHLF '\010' /* ESC-010 reverse half-line feed */
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#define FHLF '\011' /* ESC-011 forward half-line feed */
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/* build up at least this many lines before flushing them out */
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#define BUFFER_MARGIN 32
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typedef char CSET;
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typedef struct char_str {
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#define CS_NORMAL 1
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#define CS_ALTERNATE 2
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short c_column; /* column character is in */
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CSET c_set; /* character set (currently only 2) */
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wchar_t c_char; /* character in question */
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int c_width; /* character width */
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} CHAR;
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typedef struct line_str LINE;
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struct line_str {
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CHAR *l_line; /* characters on the line */
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LINE *l_prev; /* previous line */
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LINE *l_next; /* next line */
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int l_lsize; /* allocated sizeof l_line */
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int l_line_len; /* strlen(l_line) */
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int l_needs_sort; /* set if chars went in out of order */
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int l_max_col; /* max column in the line */
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};
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static LINE *alloc_line(void);
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static void dowarn(int);
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static void flush_line(LINE *);
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static void flush_lines(int);
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static void flush_blanks(void);
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static void free_line(LINE *);
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static void usage(void);
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static CSET last_set; /* char_set of last char printed */
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static LINE *lines;
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static int compress_spaces; /* if doing space -> tab conversion */
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static int fine; /* if `fine' resolution (half lines) */
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static int max_bufd_lines; /* max # lines to keep in memory */
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static int nblank_lines; /* # blanks after last flushed line */
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static int no_backspaces; /* if not to output any backspaces */
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static int pass_unknown_seqs; /* pass unknown control sequences */
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#define PUTC(ch) \
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do { \
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if (putwchar(ch) == WEOF) \
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errx(1, "write error"); \
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} while (0)
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int
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main(int argc, char **argv)
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{
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wint_t ch;
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CHAR *c;
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CSET cur_set; /* current character set */
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LINE *l; /* current line */
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int extra_lines; /* # of lines above first line */
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int cur_col; /* current column */
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int cur_line; /* line number of current position */
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int max_line; /* max value of cur_line */
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int this_line; /* line l points to */
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int nflushd_lines; /* number of lines that were flushed */
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int adjust, opt, warned, width;
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(void)setlocale(LC_CTYPE, "");
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max_bufd_lines = 128;
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compress_spaces = 1; /* compress spaces into tabs */
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while ((opt = getopt(argc, argv, "bfhl:px")) != -1)
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switch (opt) {
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case 'b': /* do not output backspaces */
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no_backspaces = 1;
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break;
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case 'f': /* allow half forward line feeds */
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fine = 1;
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break;
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case 'h': /* compress spaces into tabs */
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compress_spaces = 1;
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break;
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case 'l': /* buffered line count */
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if ((max_bufd_lines = atoi(optarg)) <= 0)
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errx(1, "bad -l argument %s", optarg);
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break;
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case 'p': /* pass unknown control sequences */
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pass_unknown_seqs = 1;
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break;
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case 'x': /* do not compress spaces into tabs */
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compress_spaces = 0;
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break;
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case '?':
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default:
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usage();
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}
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if (optind != argc)
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usage();
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/* this value is in half lines */
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max_bufd_lines *= 2;
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adjust = cur_col = extra_lines = warned = 0;
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cur_line = max_line = nflushd_lines = this_line = 0;
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cur_set = last_set = CS_NORMAL;
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lines = l = alloc_line();
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while ((ch = getwchar()) != WEOF) {
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if (!iswgraph(ch)) {
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switch (ch) {
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case BS: /* can't go back further */
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if (cur_col == 0)
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continue;
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--cur_col;
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continue;
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case CR:
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cur_col = 0;
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continue;
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case ESC: /* just ignore EOF */
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switch(getwchar()) {
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case RLF:
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cur_line -= 2;
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break;
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case RHLF:
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cur_line--;
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break;
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case FHLF:
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cur_line++;
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if (cur_line > max_line)
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max_line = cur_line;
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}
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continue;
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case NL:
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cur_line += 2;
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if (cur_line > max_line)
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max_line = cur_line;
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cur_col = 0;
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continue;
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case SPACE:
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++cur_col;
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continue;
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case SI:
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cur_set = CS_NORMAL;
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continue;
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case SO:
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cur_set = CS_ALTERNATE;
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continue;
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case TAB: /* adjust column */
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cur_col |= 7;
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++cur_col;
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continue;
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case VT:
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cur_line -= 2;
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continue;
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}
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if (iswspace(ch)) {
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if ((width = wcwidth(ch)) > 0)
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cur_col += width;
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continue;
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}
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if (!pass_unknown_seqs)
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continue;
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}
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/* Must stuff ch in a line - are we at the right one? */
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if (cur_line != this_line - adjust) {
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LINE *lnew;
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int nmove;
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adjust = 0;
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nmove = cur_line - this_line;
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if (!fine) {
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/* round up to next line */
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if (cur_line & 1) {
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adjust = 1;
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nmove++;
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}
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}
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if (nmove < 0) {
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for (; nmove < 0 && l->l_prev; nmove++)
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l = l->l_prev;
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if (nmove) {
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if (nflushd_lines == 0) {
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/*
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* Allow backup past first
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* line if nothing has been
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* flushed yet.
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*/
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for (; nmove < 0; nmove++) {
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lnew = alloc_line();
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l->l_prev = lnew;
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lnew->l_next = l;
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l = lines = lnew;
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extra_lines++;
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}
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} else {
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if (!warned++)
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dowarn(cur_line);
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cur_line -= nmove;
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}
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}
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} else {
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/* may need to allocate here */
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for (; nmove > 0 && l->l_next; nmove--)
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l = l->l_next;
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for (; nmove > 0; nmove--) {
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lnew = alloc_line();
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lnew->l_prev = l;
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l->l_next = lnew;
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l = lnew;
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}
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}
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this_line = cur_line + adjust;
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nmove = this_line - nflushd_lines;
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if (nmove >= max_bufd_lines + BUFFER_MARGIN) {
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nflushd_lines += nmove - max_bufd_lines;
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flush_lines(nmove - max_bufd_lines);
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}
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}
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/* grow line's buffer? */
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if (l->l_line_len + 1 >= l->l_lsize) {
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int need;
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need = l->l_lsize ? l->l_lsize * 2 : 90;
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if ((l->l_line = realloc(l->l_line,
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(unsigned)need * sizeof(CHAR))) == NULL)
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err(1, (char *)NULL);
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l->l_lsize = need;
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}
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c = &l->l_line[l->l_line_len++];
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c->c_char = ch;
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c->c_set = cur_set;
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c->c_column = cur_col;
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c->c_width = wcwidth(ch);
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/*
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* If things are put in out of order, they will need sorting
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* when it is flushed.
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*/
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if (cur_col < l->l_max_col)
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l->l_needs_sort = 1;
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else
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l->l_max_col = cur_col;
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if (c->c_width > 0)
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cur_col += c->c_width;
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}
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if (ferror(stdin))
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err(1, NULL);
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if (max_line == 0)
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exit(0); /* no lines, so just exit */
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/* goto the last line that had a character on it */
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for (; l->l_next; l = l->l_next)
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this_line++;
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flush_lines(this_line - nflushd_lines + extra_lines + 1);
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/* make sure we leave things in a sane state */
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if (last_set != CS_NORMAL)
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PUTC('\017');
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/* flush out the last few blank lines */
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nblank_lines = max_line - this_line;
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if (max_line & 1)
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nblank_lines++;
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else if (!nblank_lines)
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/* missing a \n on the last line? */
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nblank_lines = 2;
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flush_blanks();
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exit(0);
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}
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static void
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flush_lines(int nflush)
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{
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LINE *l;
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while (--nflush >= 0) {
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l = lines;
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lines = l->l_next;
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if (l->l_line) {
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flush_blanks();
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flush_line(l);
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}
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nblank_lines++;
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if (l->l_line)
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(void)free(l->l_line);
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free_line(l);
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}
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if (lines)
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lines->l_prev = NULL;
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}
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/*
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* Print a number of newline/half newlines. If fine flag is set, nblank_lines
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* is the number of half line feeds, otherwise it is the number of whole line
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* feeds.
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*/
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static void
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flush_blanks(void)
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{
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int half, i, nb;
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half = 0;
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nb = nblank_lines;
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if (nb & 1) {
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if (fine)
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half = 1;
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else
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nb++;
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}
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nb /= 2;
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for (i = nb; --i >= 0;)
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PUTC('\n');
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if (half) {
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PUTC('\033');
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PUTC('9');
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if (!nb)
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PUTC('\r');
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}
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nblank_lines = 0;
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}
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/*
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* Write a line to stdout taking care of space to tab conversion (-h flag)
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* and character set shifts.
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*/
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static void
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flush_line(LINE *l)
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{
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CHAR *c, *endc;
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int i, j, nchars, last_col, save, this_col, tot;
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last_col = 0;
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nchars = l->l_line_len;
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if (l->l_needs_sort) {
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static CHAR *sorted;
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static int count_size, *count, sorted_size;
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/*
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* Do an O(n) sort on l->l_line by column being careful to
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* preserve the order of characters in the same column.
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*/
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if (l->l_lsize > sorted_size) {
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sorted_size = l->l_lsize;
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if ((sorted = realloc(sorted,
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(unsigned)sizeof(CHAR) * sorted_size)) == NULL)
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err(1, (char *)NULL);
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}
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if (l->l_max_col >= count_size) {
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count_size = l->l_max_col + 1;
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if ((count = realloc(count,
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(unsigned)sizeof(int) * count_size)) == NULL)
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err(1, (char *)NULL);
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}
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memset(count, 0, sizeof(int) * l->l_max_col + 1);
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for (i = nchars, c = l->l_line; --i >= 0; c++)
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count[c->c_column]++;
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/*
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* calculate running total (shifted down by 1) to use as
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* indices into new line.
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*/
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for (tot = 0, i = 0; i <= l->l_max_col; i++) {
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save = count[i];
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count[i] = tot;
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tot += save;
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}
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for (i = nchars, c = l->l_line; --i >= 0; c++)
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sorted[count[c->c_column]++] = *c;
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c = sorted;
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} else
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c = l->l_line;
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while (nchars > 0) {
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this_col = c->c_column;
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endc = c;
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do {
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++endc;
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} while (--nchars > 0 && this_col == endc->c_column);
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/* if -b only print last character */
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if (no_backspaces) {
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c = endc - 1;
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if (nchars > 0 &&
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this_col + c->c_width > endc->c_column)
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continue;
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}
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if (this_col > last_col) {
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int nspace = this_col - last_col;
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if (compress_spaces && nspace > 1) {
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while (1) {
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int tab_col, tab_size;
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tab_col = (last_col + 8) & ~7;
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if (tab_col > this_col)
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break;
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tab_size = tab_col - last_col;
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if (tab_size == 1)
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PUTC(' ');
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else
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PUTC('\t');
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nspace -= tab_size;
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last_col = tab_col;
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}
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}
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while (--nspace >= 0)
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PUTC(' ');
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last_col = this_col;
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}
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for (;;) {
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if (c->c_set != last_set) {
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switch (c->c_set) {
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case CS_NORMAL:
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PUTC('\017');
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break;
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case CS_ALTERNATE:
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PUTC('\016');
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}
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last_set = c->c_set;
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}
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PUTC(c->c_char);
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if ((c + 1) < endc)
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for (j = 0; j < c->c_width; j++)
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PUTC('\b');
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if (++c >= endc)
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break;
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}
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last_col += (c - 1)->c_width;
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}
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}
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#define NALLOC 64
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static LINE *line_freelist;
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static LINE *
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alloc_line(void)
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{
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LINE *l;
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int i;
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if (!line_freelist) {
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if ((l = realloc(NULL, sizeof(LINE) * NALLOC)) == NULL)
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err(1, (char *)NULL);
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line_freelist = l;
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for (i = 1; i < NALLOC; i++, l++)
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l->l_next = l + 1;
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l->l_next = NULL;
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}
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l = line_freelist;
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line_freelist = l->l_next;
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memset(l, 0, sizeof(LINE));
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return (l);
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}
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static void
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free_line(LINE *l)
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{
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l->l_next = line_freelist;
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line_freelist = l;
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: col [-bfhpx] [-l nline]\n");
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exit(1);
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}
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static void
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dowarn(int line)
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{
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warnx("warning: can't back up %s",
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line < 0 ? "past first line" : "-- line already flushed");
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}
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