436 lines
11 KiB
C
436 lines
11 KiB
C
/* $NetBSD: nl.c,v 1.8 2008/04/28 20:24:14 martin Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT(
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"@(#) Copyright (c) 1999\
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The NetBSD Foundation, Inc. All rights reserved.");
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__RCSID("$NetBSD: nl.c,v 1.8 2008/04/28 20:24:14 martin Exp $");
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#endif
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#include <errno.h>
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#include <limits.h>
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#include <locale.h>
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#include <regex.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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typedef enum {
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number_all, /* number all lines */
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number_nonempty, /* number non-empty lines */
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number_none, /* no line numbering */
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number_regex /* number lines matching regular expression */
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} numbering_type;
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struct numbering_property {
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const char * const name; /* for diagnostics */
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numbering_type type; /* numbering type */
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regex_t expr; /* for type == number_regex */
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};
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/* line numbering formats */
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#define FORMAT_LN "%-*d" /* left justified, leading zeros suppressed */
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#define FORMAT_RN "%*d" /* right justified, leading zeros suppressed */
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#define FORMAT_RZ "%0*d" /* right justified, leading zeros kept */
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#define FOOTER 0
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#define BODY 1
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#define HEADER 2
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#define NP_LAST HEADER
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static struct numbering_property numbering_properties[NP_LAST + 1] = {
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{ "footer", number_none },
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{ "body", number_nonempty },
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{ "header", number_none }
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};
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#define max(a, b) ((a) > (b) ? (a) : (b))
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/*
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* Maximum number of characters required for a decimal representation of a
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* (signed) int; courtesy of tzcode.
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*/
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#define INT_STRLEN_MAXIMUM \
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((sizeof (int) * CHAR_BIT - 1) * 302 / 1000 + 2)
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static void filter __P((void));
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int main __P((int, char *[]));
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static void parse_numbering __P((const char *, int));
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static void usage __P((void));
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/*
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* Pointer to dynamically allocated input line buffer, and its size.
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*/
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static char *buffer;
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static size_t buffersize;
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/*
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* Dynamically allocated buffer suitable for string representation of ints.
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*/
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static char *intbuffer;
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/*
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* Configurable parameters.
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*/
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/* delimiter characters that indicate the start of a logical page section */
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static char delim[2] = { '\\', ':' };
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/* line numbering format */
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static const char *format = FORMAT_RN;
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/* increment value used to number logical page lines */
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static int incr = 1;
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/* number of adjacent blank lines to be considered (and numbered) as one */
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static unsigned int nblank = 1;
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/* whether to restart numbering at logical page delimiters */
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static int restart = 1;
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/* characters used in separating the line number and the corrsp. text line */
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static const char *sep = "\t";
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/* initial value used to number logical page lines */
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static int startnum = 1;
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/* number of characters to be used for the line number */
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/* should be unsigned but required signed by `*' precision conversion */
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static int width = 6;
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int c;
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long val;
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unsigned long uval;
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char *ep;
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size_t intbuffersize;
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(void)setlocale(LC_ALL, "");
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/*
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* Note: this implementation strictly conforms to the XBD Utility
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* Syntax Guidelines and does not permit the optional `file' operand
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* to be intermingled with the options, which is defined in the
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* XCU specification (Issue 5) but declared an obsolescent feature that
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* will be removed from a future issue. It shouldn't matter, though.
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*/
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while ((c = getopt(argc, argv, "pb:d:f:h:i:l:n:s:v:w:")) != -1) {
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switch (c) {
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case 'p':
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restart = 0;
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break;
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case 'b':
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parse_numbering(optarg, BODY);
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break;
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case 'd':
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if (optarg[0] != '\0')
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delim[0] = optarg[0];
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if (optarg[1] != '\0')
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delim[1] = optarg[1];
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/* at most two delimiter characters */
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if (optarg[2] != '\0') {
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(void)fprintf(stderr,
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"nl: invalid delim argument -- %s\n",
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optarg);
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exit(EXIT_FAILURE);
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/* NOTREACHED */
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}
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break;
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case 'f':
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parse_numbering(optarg, FOOTER);
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break;
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case 'h':
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parse_numbering(optarg, HEADER);
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break;
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case 'i':
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errno = 0;
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val = strtol(optarg, &ep, 10);
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if ((ep != NULL && *ep != '\0') ||
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((val == LONG_MIN || val == LONG_MAX) && errno != 0)) {
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(void)fprintf(stderr,
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"invalid incr argument -- %s\n", optarg);
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exit(EXIT_FAILURE);
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}
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incr = (int)val;
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break;
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case 'l':
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errno = 0;
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uval = strtoul(optarg, &ep, 10);
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if ((ep != NULL && *ep != '\0') ||
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(uval == ULONG_MAX && errno != 0)) {
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(void)fprintf(stderr,
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"invalid num argument -- %s\n", optarg);
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exit(EXIT_FAILURE);
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}
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nblank = (unsigned int)uval;
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break;
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case 'n':
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if (strcmp(optarg, "ln") == 0) {
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format = FORMAT_LN;
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} else if (strcmp(optarg, "rn") == 0) {
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format = FORMAT_RN;
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} else if (strcmp(optarg, "rz") == 0) {
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format = FORMAT_RZ;
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} else {
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(void)fprintf(stderr,
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"nl: illegal format -- %s\n", optarg);
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exit(EXIT_FAILURE);
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}
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break;
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case 's':
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sep = optarg;
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break;
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case 'v':
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errno = 0;
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val = strtol(optarg, &ep, 10);
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if ((ep != NULL && *ep != '\0') ||
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((val == LONG_MIN || val == LONG_MAX) && errno != 0)) {
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(void)fprintf(stderr,
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"invalid startnum value -- %s\n", optarg);
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exit(EXIT_FAILURE);
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}
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startnum = (int)val;
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break;
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case 'w':
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errno = 0;
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val = strtol(optarg, &ep, 10);
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if ((ep != NULL && *ep != '\0') ||
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((val == LONG_MIN || val == LONG_MAX) && errno != 0)) {
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(void)fprintf(stderr,
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"invalid width value -- %s\n", optarg);
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exit(EXIT_FAILURE);
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}
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width = (int)val;
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if (!(width > 0)) {
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(void)fprintf(stderr,
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"nl: width argument must be > 0 -- %d\n",
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width);
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exit(EXIT_FAILURE);
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}
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break;
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case '?':
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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switch (argc) {
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case 0:
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break;
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case 1:
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if (freopen(argv[0], "r", stdin) == NULL) {
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perror(argv[0]);
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exit(EXIT_FAILURE);
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}
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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/* Determine the maximum input line length to operate on. */
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if ((val = sysconf(_SC_LINE_MAX)) == -1) /* ignore errno */
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val = LINE_MAX;
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/* Allocate sufficient buffer space (including the terminating NUL). */
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buffersize = (size_t)val + 1;
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if ((buffer = malloc(buffersize)) == NULL) {
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perror("cannot allocate input line buffer");
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exit(EXIT_FAILURE);
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}
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/* Allocate a buffer suitable for preformatting line number. */
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intbuffersize = max(INT_STRLEN_MAXIMUM, width) + 1; /* NUL */
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if ((intbuffer = malloc(intbuffersize)) == NULL) {
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perror("cannot allocate preformatting buffer");
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exit(EXIT_FAILURE);
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}
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/* Do the work. */
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filter();
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exit(EXIT_SUCCESS);
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/* NOTREACHED */
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}
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static void
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filter()
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{
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int line; /* logical line number */
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int section; /* logical page section */
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unsigned int adjblank; /* adjacent blank lines */
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int consumed; /* intbuffer measurement */
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int donumber, idx;
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adjblank = 0;
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line = startnum;
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section = BODY;
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#ifdef __GNUC__
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donumber = 0; /* avoid bogus `uninitialized' warning */
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#endif
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while (fgets(buffer, (int)buffersize, stdin) != NULL) {
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for (idx = FOOTER; idx <= NP_LAST; idx++) {
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/* Does it look like a delimiter? */
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if (buffer[2 * idx + 0] == delim[0] &&
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buffer[2 * idx + 1] == delim[1]) {
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/* Was this the whole line? */
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if (buffer[2 * idx + 2] == '\n') {
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section = idx;
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adjblank = 0;
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if (restart)
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line = startnum;
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goto nextline;
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}
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} else {
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break;
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}
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}
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switch (numbering_properties[section].type) {
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case number_all:
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/*
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* Doing this for number_all only is disputable, but
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* the standard expresses an explicit dependency on
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* `-b a' etc.
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*/
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if (buffer[0] == '\n' && ++adjblank < nblank)
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donumber = 0;
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else
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donumber = 1, adjblank = 0;
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break;
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case number_nonempty:
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donumber = (buffer[0] != '\n');
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break;
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case number_none:
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donumber = 0;
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break;
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case number_regex:
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donumber =
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(regexec(&numbering_properties[section].expr,
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buffer, 0, NULL, 0) == 0);
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break;
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}
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if (donumber) {
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/* Note: sprintf() is safe here. */
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consumed = sprintf(intbuffer, format, width, line);
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(void)printf("%s",
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intbuffer + max(0, consumed - width));
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line += incr;
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} else {
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(void)printf("%*s", width, "");
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}
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(void)printf("%s%s", sep, buffer);
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if (ferror(stdout)) {
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perror("output error");
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exit(EXIT_FAILURE);
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}
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nextline:
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;
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}
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if (ferror(stdin)) {
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perror("input error");
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exit(EXIT_FAILURE);
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}
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}
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/*
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* Various support functions.
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*/
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static void
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parse_numbering(argstr, section)
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const char *argstr;
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int section;
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{
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int error;
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char errorbuf[NL_TEXTMAX];
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switch (argstr[0]) {
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case 'a':
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numbering_properties[section].type = number_all;
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break;
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case 'n':
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numbering_properties[section].type = number_none;
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break;
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case 't':
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numbering_properties[section].type = number_nonempty;
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break;
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case 'p':
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/* If there was a previous expression, throw it away. */
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if (numbering_properties[section].type == number_regex)
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regfree(&numbering_properties[section].expr);
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else
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numbering_properties[section].type = number_regex;
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/* Compile/validate the supplied regular expression. */
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if ((error = regcomp(&numbering_properties[section].expr,
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&argstr[1], REG_NEWLINE|REG_NOSUB)) != 0) {
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(void)regerror(error,
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&numbering_properties[section].expr,
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errorbuf, sizeof (errorbuf));
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(void)fprintf(stderr,
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"nl: %s expr: %s -- %s\n",
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numbering_properties[section].name, errorbuf,
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&argstr[1]);
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exit(EXIT_FAILURE);
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}
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break;
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default:
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(void)fprintf(stderr,
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"nl: illegal %s line numbering type -- %s\n",
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numbering_properties[section].name, argstr);
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exit(EXIT_FAILURE);
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}
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}
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static void
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usage()
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{
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(void)fprintf(stderr, "usage: nl [-p] [-b type] [-d delim] [-f type] \
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[-h type] [-i incr] [-l num]\n\t[-n format] [-s sep] [-v startnum] [-w width] \
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[file]\n");
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exit(EXIT_FAILURE);
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}
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