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Diffstat (limited to 'text-utils/col.c')
| -rw-r--r-- | text-utils/col.c | 601 |
1 files changed, 601 insertions, 0 deletions
diff --git a/text-utils/col.c b/text-utils/col.c new file mode 100644 index 0000000..66fc819 --- /dev/null +++ b/text-utils/col.c @@ -0,0 +1,601 @@ +/*- + * Copyright (c) 1990 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. + * 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. + * + * Wed Jun 22 22:15:41 1994, faith@cs.unc.edu: Added internationalization + * patches from Andries.Brouwer@cwi.nl + * Wed Sep 14 22:31:17 1994: patches from Carl Christofferson + * (cchris@connected.com) + * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL> + * added Native Language Support + * 1999-09-19 Bruno Haible <haible@clisp.cons.org> + * modified to work correctly in multi-byte locales + * + */ + +/* + * This command is deprecated. The utility is in maintenance mode, + * meaning we keep them in source tree for backward compatibility + * only. Do not waste time making this command better, unless the + * fix is about security or other very critical issue. + * + * See Documentation/deprecated.txt for more information. + */ + +#include <stdlib.h> +#include <errno.h> +#include <ctype.h> +#include <string.h> +#include <stdio.h> +#include <unistd.h> +#include <getopt.h> + +#include "nls.h" +#include "xalloc.h" +#include "widechar.h" +#include "strutils.h" +#include "closestream.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 '\007' /* ESC-07 reverse line feed */ +#define RHLF '\010' /* ESC-010 reverse half-line feed */ +#define FHLF '\011' /* ESC-011 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 + int 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 */ +}; + +void free_line(LINE *l); +void flush_line(LINE *l); +void flush_lines(int); +void flush_blanks(void); +LINE *alloc_line(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 unsigned max_bufd_lines; /* max # 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; /* whether to pass unknown control sequences */ + +#define PUTC(ch) \ + if (putwchar(ch) == WEOF) \ + wrerr(); + +static void __attribute__((__noreturn__)) usage(void) +{ + FILE *out = stdout; + fprintf(out, _( + "\nUsage:\n" + " %s [options]\n"), program_invocation_short_name); + + fputs(USAGE_SEPARATOR, out); + fputs(_("Filter out reverse line feeds.\n"), out); + + fprintf(out, _( + "\nOptions:\n" + " -b, --no-backspaces do not output backspaces\n" + " -f, --fine permit forward half line feeds\n" + " -p, --pass pass unknown control sequences\n" + " -h, --tabs convert spaces to tabs\n" + " -x, --spaces convert tabs to spaces\n" + " -l, --lines NUM buffer at least NUM lines\n" + )); + printf( " -H, --help %s\n", USAGE_OPTSTR_HELP); + printf( " -V, --version %s\n", USAGE_OPTSTR_VERSION); + + fputs(USAGE_SEPARATOR, out); + fprintf(out, _( + "%s reads from standard input and writes to standard output\n\n"), + program_invocation_short_name); + + printf(USAGE_MAN_TAIL("col(1)")); + exit(EXIT_SUCCESS); +} + +static void __attribute__((__noreturn__)) wrerr(void) +{ + errx(EXIT_FAILURE, _("write error")); +} + +int main(int argc, char **argv) +{ + register wint_t ch; + CHAR *c = NULL; + 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; + int ret = EXIT_SUCCESS; + + static const struct option longopts[] = { + { "no-backspaces", no_argument, NULL, 'b' }, + { "fine", no_argument, NULL, 'f' }, + { "pass", no_argument, NULL, 'p' }, + { "tabs", no_argument, NULL, 'h' }, + { "spaces", no_argument, NULL, 'x' }, + { "lines", required_argument, NULL, 'l' }, + { "version", no_argument, NULL, 'V' }, + { "help", no_argument, NULL, 'H' }, + { NULL, 0, NULL, 0 } + }; + + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + close_stdout_atexit(); + + max_bufd_lines = 128 * 2; + compress_spaces = 1; /* compress spaces into tabs */ + pass_unknown_seqs = 0; /* remove unknown escape sequences */ + + while ((opt = getopt_long(argc, argv, "bfhl:pxVH", longopts, NULL)) != -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, which is a value in half + * lines e.g. twice the amount specified. + */ + max_bufd_lines = strtou32_or_err(optarg, _("bad -l argument")) * 2; + break; + case 'p': + pass_unknown_seqs = 1; + break; + case 'x': /* do not compress spaces into tabs */ + compress_spaces = 0; + break; + + case 'V': + print_version(EXIT_SUCCESS); + case 'H': + usage(); + default: + errtryhelp(EXIT_FAILURE); + } + + if (optind != argc) { + warnx(_("bad usage")); + errtryhelp(EXIT_FAILURE); + } + + 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 (feof(stdin) == 0) { + errno = 0; + if ((ch = getwchar()) == WEOF) { + if (errno == EILSEQ) { + warn(_("failed on line %d"), max_line + 1); + ret = EXIT_FAILURE; + } + break; + } + if (!iswgraph(ch)) { + switch (ch) { + case BS: /* can't go back further */ + if (cur_col == 0) + continue; + if (c) + cur_col -= c->c_width; + else + cur_col--; + continue; + case CR: + cur_col = 0; + continue; + case ESC: /* just ignore EOF */ + switch(getwchar()) { + case RLF: + cur_line -= 2; + break; + case RHLF: + cur_line--; + break; + case FHLF: + cur_line++; + if (cur_line > max_line) + max_line = cur_line; + } + continue; + case NL: + 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: + cur_line -= 2; + continue; + } + if (iswspace(ch)) { + if (wcwidth(ch) > 0) + cur_col += wcwidth(ch); + continue; + } + if (!pass_unknown_seqs) + continue; + } + + /* Must stuff ch in a line - are we at the right one? */ + if (cur_line != this_line - adjust) { + LINE *lnew; + int nmove; + + adjust = 0; + nmove = cur_line - this_line; + if (!fine) { + /* round up to next line */ + if (cur_line & 1) { + adjust = 1; + nmove++; + } + } + if (nmove < 0) { + for (; nmove < 0 && l->l_prev; nmove++) + l = l->l_prev; + if (nmove) { + if (nflushd_lines == 0) { + /* + * Allow backup past first + * line if nothing has been + * flushed yet. + */ + for (; nmove < 0; nmove++) { + lnew = alloc_line(); + l->l_prev = lnew; + lnew->l_next = l; + l = lines = lnew; + extra_lines++; + } + } else { + if (!warned++) + warnx( + _("warning: can't back up %s."), cur_line < 0 ? + _("past first line") : _("-- line already flushed")); + cur_line -= nmove; + } + } + } else { + /* may need to allocate here */ + for (; nmove > 0 && l->l_next; nmove--) + l = l->l_next; + for (; nmove > 0; nmove--) { + lnew = alloc_line(); + lnew->l_prev = l; + l->l_next = lnew; + l = lnew; + } + } + this_line = cur_line + adjust; + nmove = this_line - nflushd_lines; + if (nmove > 0 + && (unsigned) nmove >= max_bufd_lines + BUFFER_MARGIN) { + nflushd_lines += nmove - max_bufd_lines; + flush_lines(nmove - 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; + l->l_line = xrealloc((void *) l->l_line, + (unsigned) need * sizeof(CHAR)); + l->l_lsize = need; + } + c = &l->l_line[l->l_line_len++]; + c->c_char = ch; + c->c_set = cur_set; + if (0 < cur_col) + c->c_column = cur_col; + else + c->c_column = 0; + 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; + } + /* goto the last line that had a character on it */ + for (; l->l_next; l = l->l_next) + this_line++; + if (max_line == 0 && cur_col == 0) + return EXIT_SUCCESS; /* no lines, so just exit */ + flush_lines(this_line - nflushd_lines + extra_lines + 1); + + /* make sure we leave things in a sane state */ + if (last_set != CS_NORMAL) + PUTC('\017'); + + /* flush out the last few blank lines */ + nblank_lines = max_line - this_line; + if (max_line & 1) + nblank_lines++; + else if (!nblank_lines) + /* missing a \n on the last line? */ + nblank_lines = 2; + flush_blanks(); + return ret; +} + +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); + } + nblank_lines++; + free((void *)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. + */ +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('\033'); + PUTC('9'); + 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. + */ +void flush_line(LINE *l) +{ + CHAR *c, *endc; + int nchars, last_col, this_col; + + last_col = 0; + nchars = l->l_line_len; + + if (l->l_needs_sort) { + static CHAR *sorted = NULL; + static int count_size = 0, *count = NULL, sorted_size = 0; + int i, tot; + + /* + * 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; + sorted = xrealloc((void *)sorted, + (unsigned)sizeof(CHAR) * sorted_size); + } + if (l->l_max_col >= count_size) { + count_size = l->l_max_col + 1; + count = (int *)xrealloc((void *)count, + (unsigned)sizeof(int) * count_size); + } + memset(count, 0, sizeof(int) * l->l_max_col + 1); + for (i = nchars, c = l->l_line; c && --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++) { + int 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) { + int ntabs; + + ntabs = this_col / 8 - last_col / 8; + if (ntabs > 0) { + nspace = this_col & 7; + while (--ntabs >= 0) + PUTC('\t'); + } + } + while (--nspace >= 0) + PUTC(' '); + last_col = this_col; + } + + for (;;) { + if (c->c_set != last_set) { + switch (c->c_set) { + case CS_NORMAL: + PUTC('\017'); + break; + case CS_ALTERNATE: + PUTC('\016'); + } + last_set = c->c_set; + } + PUTC(c->c_char); + if ((c + 1) < endc) { + int i; + for (i=0; i < c->c_width; i++) + PUTC('\b'); + } + if (++c >= endc) + break; + } + last_col += (c - 1)->c_width; + } +} + +#define NALLOC 64 + +static LINE *line_freelist; + +LINE * +alloc_line(void) +{ + LINE *l; + int i; + + if (!line_freelist) { + l = xmalloc(sizeof(LINE) * NALLOC); + 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; +} + +void free_line(LINE *l) +{ + l->l_next = line_freelist; + line_freelist = l; +} |