-/* From https://svnweb.freebsd.org/base/head/usr.bin/col/, r282722 */
-
-/*-
- * Copyright (c) 1990, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Michael Rendell of the Memorial University of Newfoundland.
- *
- * 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.
- * 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 const char copyright[] =
-"@(#) Copyright (c) 1990, 1993, 1994\n\
- The Regents of the University of California. All rights reserved.\n";
-#endif
-
-#if 0
-#ifndef lint
-static char sccsid[] = "@(#)col.c 8.5 (Berkeley) 5/4/95";
-#endif
-#endif
-
-#include <sys/cdefs.h>
-
-#include <err.h>
-#include <errno.h>
-#include <limits.h>
-#include <locale.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <termios.h>
-#include <unistd.h>
-#include <wchar.h>
-#include <wctype.h>
-
-#define BS '\b' /* backspace */
-#define TAB '\t' /* tab */
-#define SPACE ' ' /* space */
-#define NL '\n' /* newline */
-#define CR '\r' /* carriage return */
-#define ESC '\033' /* escape */
-#define SI '\017' /* shift in to normal character set */
-#define SO '\016' /* shift out to alternate character set */
-#define VT '\013' /* vertical tab (aka reverse line feed) */
-#define RLF '7' /* ESC-7 reverse line feed */
-#define RHLF '8' /* ESC-8 reverse half-line feed */
-#define FHLF '9' /* ESC-9 forward half-line feed */
-
-/* build up at least this many lines before flushing them out */
-#define BUFFER_MARGIN 32
-
-typedef char CSET;
-
-typedef struct char_str {
-#define CS_NORMAL 1
-#define CS_ALTERNATE 2
- short c_column; /* column character is in */
- CSET c_set; /* character set (currently only 2) */
- wchar_t c_char; /* character in question */
- int c_width; /* character width */
-} CHAR;
-
-typedef struct line_str LINE;
-struct line_str {
- CHAR *l_line; /* characters on the line */
- LINE *l_prev; /* previous line */
- LINE *l_next; /* next line */
- int l_lsize; /* allocated sizeof l_line */
- int l_line_len; /* strlen(l_line) */
- int l_needs_sort; /* set if chars went in out of order */
- int l_max_col; /* max column in the line */
-};
-
-static void addto_lineno(int *, int);
-static LINE *alloc_line(void);
-static void dowarn(int);
-static void flush_line(LINE *);
-static void flush_lines(int);
-static void flush_blanks(void);
-static void free_line(LINE *);
-static void usage(void);
-
-static CSET last_set; /* char_set of last char printed */
-static LINE *lines;
-static int compress_spaces; /* if doing space -> tab conversion */
-static int fine; /* if `fine' resolution (half lines) */
-static int max_bufd_lines; /* max # of half lines to keep in memory */
-static int nblank_lines; /* # blanks after last flushed line */
-static int no_backspaces; /* if not to output any backspaces */
-static int pass_unknown_seqs; /* pass unknown control sequences */
-
-#define PUTC(ch) \
- do { \
- if (putwchar(ch) == WEOF) \
- errx(1, "write error"); \
- } while (0)
-
-int
-main(int argc, char **argv)
-{
- wint_t ch;
- CHAR *c;
- CSET cur_set; /* current character set */
- LINE *l; /* current line */
- int extra_lines; /* # of lines above first line */
- int cur_col; /* current column */
- int cur_line; /* line number of current position */
- int max_line; /* max value of cur_line */
- int this_line; /* line l points to */
- int nflushd_lines; /* number of lines that were flushed */
- int adjust, opt, warned, width;
- const char *errstr;
- unsigned long cmd;
-
- (void)setlocale(LC_CTYPE, "");
-
- max_bufd_lines = 256;
- compress_spaces = 1; /* compress spaces into tabs */
- while ((opt = getopt(argc, argv, "bfhl:px")) != -1)
- switch (opt) {
- case 'b': /* do not output backspaces */
- no_backspaces = 1;
- break;
- case 'f': /* allow half forward line feeds */
- fine = 1;
- break;
- case 'h': /* compress spaces into tabs */
- compress_spaces = 1;
- break;
- case 'l': /* buffered line count */
- max_bufd_lines = atoi(optarg);
- break;
- case 'p': /* pass unknown control sequences */
- pass_unknown_seqs = 1;
- break;
- case 'x': /* do not compress spaces into tabs */
- compress_spaces = 0;
- break;
- case '?':
- default:
- usage();
- }
-
- if (optind != argc)
- usage();
-
- adjust = cur_col = extra_lines = warned = 0;
- cur_line = max_line = nflushd_lines = this_line = 0;
- cur_set = last_set = CS_NORMAL;
- lines = l = alloc_line();
-
- while ((ch = getwchar()) != WEOF) {
- if (!iswgraph(ch)) {
- switch (ch) {
- case BS: /* can't go back further */
- if (cur_col == 0)
- continue;
- --cur_col;
- continue;
- case CR:
- cur_col = 0;
- continue;
- case ESC: /* just ignore EOF */
- switch(getwchar()) {
- /*
- * In the input stream, accept both the
- * XPG5 sequences ESC-digit and the
- * traditional BSD sequences ESC-ctrl.
- */
- case '\007':
- /* FALLTHROUGH */
- case RLF:
- addto_lineno(&cur_line, -2);
- break;
- case '\010':
- /* FALLTHROUGH */
- case RHLF:
- addto_lineno(&cur_line, -1);
- break;
- case '\011':
- /* FALLTHROUGH */
- case FHLF:
- addto_lineno(&cur_line, 1);
- if (cur_line > max_line)
- max_line = cur_line;
- }
- continue;
- case NL:
- addto_lineno(&cur_line, 2);
- if (cur_line > max_line)
- max_line = cur_line;
- cur_col = 0;
- continue;
- case SPACE:
- ++cur_col;
- continue;
- case SI:
- cur_set = CS_NORMAL;
- continue;
- case SO:
- cur_set = CS_ALTERNATE;
- continue;
- case TAB: /* adjust column */
- cur_col |= 7;
- ++cur_col;
- continue;
- case VT:
- addto_lineno(&cur_line, -2);
- continue;
- }
- if (iswspace(ch)) {
- if ((width = wcwidth(ch)) > 0)
- cur_col += width;
- continue;
- }
- if (!pass_unknown_seqs)
- continue;
- }
-
- /* Must stuff ch in a line - are we at the right one? */
- if (cur_line + adjust != this_line) {
- LINE *lnew;
-
- /* round up to next line */
- adjust = !fine && (cur_line & 1);
-
- if (cur_line + adjust < this_line) {
- while (cur_line + adjust < this_line &&
- l->l_prev != NULL) {
- l = l->l_prev;
- this_line--;
- }
- if (cur_line + adjust < this_line) {
- if (nflushd_lines == 0) {
- /*
- * Allow backup past first
- * line if nothing has been
- * flushed yet.
- */
- while (cur_line + adjust
- < this_line) {
- lnew = alloc_line();
- l->l_prev = lnew;
- lnew->l_next = l;
- l = lines = lnew;
- extra_lines++;
- this_line--;
- }
- } else {
- if (!warned++)
- dowarn(cur_line);
- cur_line = this_line - adjust;
- }
- }
- } else {
- /* may need to allocate here */
- while (cur_line + adjust > this_line) {
- if (l->l_next == NULL) {
- l->l_next = alloc_line();
- l->l_next->l_prev = l;
- }
- l = l->l_next;
- this_line++;
- }
- }
- if (this_line > nflushd_lines &&
- this_line - nflushd_lines >=
- max_bufd_lines + BUFFER_MARGIN) {
- if (extra_lines) {
- flush_lines(extra_lines);
- extra_lines = 0;
- }
- flush_lines(this_line - nflushd_lines -
- max_bufd_lines);
- nflushd_lines = this_line - max_bufd_lines;
- }
- }
- /* grow line's buffer? */
- if (l->l_line_len + 1 >= l->l_lsize) {
- int need;
-
- need = l->l_lsize ? l->l_lsize * 2 : 90;
- if ((l->l_line = realloc(l->l_line,
- (unsigned)need * sizeof(CHAR))) == NULL)
- err(1, NULL);
- l->l_lsize = need;
- }
- c = &l->l_line[l->l_line_len++];
- c->c_char = ch;
- c->c_set = cur_set;
- c->c_column = cur_col;
- c->c_width = wcwidth(ch);
- /*
- * If things are put in out of order, they will need sorting
- * when it is flushed.
- */
- if (cur_col < l->l_max_col)
- l->l_needs_sort = 1;
- else
- l->l_max_col = cur_col;
- if (c->c_width > 0)
- cur_col += c->c_width;
- }
- if (ferror(stdin))
- err(1, NULL);
- if (extra_lines)
- flush_lines(extra_lines);
-
- /* goto the last line that had a character on it */
- for (; l->l_next; l = l->l_next)
- this_line++;
- flush_lines(this_line - nflushd_lines + 1);
-
- /* make sure we leave things in a sane state */
- if (last_set != CS_NORMAL)
- PUTC(SI);
-
- /* flush out the last few blank lines */
- if (max_line > this_line)
- nblank_lines = max_line - this_line;
- if (max_line & 1)
- nblank_lines++;
- flush_blanks();
- exit(0);
-}
-
-static void
-flush_lines(int nflush)
-{
- LINE *l;
-
- while (--nflush >= 0) {
- l = lines;
- lines = l->l_next;
- if (l->l_line) {
- flush_blanks();
- flush_line(l);
- }
- if (l->l_line || l->l_next)
- nblank_lines++;
- if (l->l_line)
- (void)free(l->l_line);
- free_line(l);
- }
- if (lines)
- lines->l_prev = NULL;
-}
-
-/*
- * Print a number of newline/half newlines. If fine flag is set, nblank_lines
- * is the number of half line feeds, otherwise it is the number of whole line
- * feeds.
- */
-static void
-flush_blanks(void)
-{
- int half, i, nb;
-
- half = 0;
- nb = nblank_lines;
- if (nb & 1) {
- if (fine)
- half = 1;
- else
- nb++;
- }
- nb /= 2;
- for (i = nb; --i >= 0;)
- PUTC('\n');
- if (half) {
- PUTC(ESC);
- PUTC(FHLF);
- if (!nb)
- PUTC('\r');
- }
- nblank_lines = 0;
-}
-
-/*
- * Write a line to stdout taking care of space to tab conversion (-h flag)
- * and character set shifts.
- */
-static void
-flush_line(LINE *l)
-{
- CHAR *c, *endc;
- int i, j, nchars, last_col, save, this_col, tot;
-
- last_col = 0;
- nchars = l->l_line_len;
-
- if (l->l_needs_sort) {
- static CHAR *sorted;
- static int count_size, *count, sorted_size;
-
- /*
- * Do an O(n) sort on l->l_line by column being careful to
- * preserve the order of characters in the same column.
- */
- if (l->l_lsize > sorted_size) {
- sorted_size = l->l_lsize;
- if ((sorted = realloc(sorted,
- (unsigned)sizeof(CHAR) * sorted_size)) == NULL)
- err(1, NULL);
- }
- if (l->l_max_col >= count_size) {
- count_size = l->l_max_col + 1;
- if ((count = realloc(count,
- (unsigned)sizeof(int) * count_size)) == NULL)
- err(1, NULL);
- }
- memset(count, 0, sizeof(int) * l->l_max_col + 1);
- for (i = nchars, c = l->l_line; --i >= 0; c++)
- count[c->c_column]++;
-
- /*
- * calculate running total (shifted down by 1) to use as
- * indices into new line.
- */
- for (tot = 0, i = 0; i <= l->l_max_col; i++) {
- save = count[i];
- count[i] = tot;
- tot += save;
- }
-
- for (i = nchars, c = l->l_line; --i >= 0; c++)
- sorted[count[c->c_column]++] = *c;
- c = sorted;
- } else
- c = l->l_line;
- while (nchars > 0) {
- this_col = c->c_column;
- endc = c;
- do {
- ++endc;
- } while (--nchars > 0 && this_col == endc->c_column);
-
- /* if -b only print last character */
- if (no_backspaces) {
- c = endc - 1;
- if (nchars > 0 &&
- this_col + c->c_width > endc->c_column)
- continue;
- }
-
- if (this_col > last_col) {
- int nspace = this_col - last_col;
-
- if (compress_spaces && nspace > 1) {
- while (1) {
- int tab_col, tab_size;
-
- tab_col = (last_col + 8) & ~7;
- if (tab_col > this_col)
- break;
- tab_size = tab_col - last_col;
- if (tab_size == 1)
- PUTC(' ');
- else
- PUTC('\t');
- nspace -= tab_size;
- last_col = tab_col;
- }
- }
- while (--nspace >= 0)
- PUTC(' ');
- last_col = this_col;
- }
-
- for (;;) {
- if (c->c_set != last_set) {
- switch (c->c_set) {
- case CS_NORMAL:
- PUTC(SI);
- break;
- case CS_ALTERNATE:
- PUTC(SO);
- }
- last_set = c->c_set;
- }
- PUTC(c->c_char);
- if ((c + 1) < endc)
- for (j = 0; j < c->c_width; j++)
- PUTC('\b');
- if (++c >= endc)
- break;
- }
- last_col += (c - 1)->c_width;
- }
-}
-
-/*
- * Increment or decrement a line number, checking for overflow.
- * Stop one below INT_MAX such that the adjust variable is safe.
- */
-void
-addto_lineno(int *lno, int offset)
-{
- if (offset > 0) {
- if (*lno >= INT_MAX - offset)
- errx(1, "too many lines");
- } else {
- if (*lno < INT_MIN - offset)
- errx(1, "too many reverse line feeds");
- }
- *lno += offset;
-}
-
-#define NALLOC 64
-
-static LINE *line_freelist;
-
-static LINE *
-alloc_line(void)
-{
- LINE *l;
- int i;
-
- if (!line_freelist) {
- if ((l = realloc(NULL, sizeof(LINE) * NALLOC)) == NULL)
- err(1, NULL);
- line_freelist = l;
- for (i = 1; i < NALLOC; i++, l++)
- l->l_next = l + 1;
- l->l_next = NULL;
- }
- l = line_freelist;
- line_freelist = l->l_next;
-
- memset(l, 0, sizeof(LINE));
- return (l);
-}
-
-static void
-free_line(LINE *l)
-{
-
- l->l_next = line_freelist;
- line_freelist = l;
-}
-
-static void
-usage(void)
-{
-
- (void)fprintf(stderr, "usage: col [-bfhpx] [-l nline]\n");
- exit(1);
-}
-
-static void
-dowarn(int line)
-{
-
- warnx("warning: can't back up %s",
- line < 0 ? "past first line" : "-- line already flushed");
-}
~mdw / termux-packages / commitdiff