Return to lam.c CVS log

Up to [local] / src / usr.bin / lam

After opening all the needed files, tighten the pledge(2)
from "stdio rpath" to just "stdio", before parsing any user data.
It may not matter that much just yet, but parsing will become
slightly more complicated soon when i shall add UTF-8 handling.
OK millert@

/*	$OpenBSD: lam.c,v 1.21 2018/07/11 11:42:17 schwarze Exp $	*/
/*	$NetBSD: lam.c,v 1.2 1994/11/14 20:27:42 jtc Exp $	*/

/*-
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. 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.
 */

/*
 *	lam - laminate files
 *	Author:  John Kunze, UCB
 */

#include <sys/param.h>	/* NOFILE_MAX */

#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define	BIGBUFSIZ	5 * BUFSIZ

struct	openfile {		/* open file structure */
	FILE	*fp;		/* file pointer */
	short	eof;		/* eof flag */
	short	pad;		/* pad flag for missing columns */
	char	eol;		/* end of line character */
	char	*sepstring;	/* string to print before each line */
	char	*format;	/* printf(3) style string spec. */
}	input[NOFILE_MAX + 1];	/* last one is for the last -s arg. */
#define INPUTSIZE sizeof(input) / sizeof(*input)

int	numfiles;		/* number of open files */
int	nofinalnl;		/* normally append \n to each output line */
char	line[BIGBUFSIZ];
char	*linep;

void	 usage(void);
char	*gatherline(struct openfile *);
void	 getargs(int, char *[]);
char	*pad(struct openfile *);

int
main(int argc, char *argv[])
{
	int i;

	if (pledge("stdio rpath", NULL) == -1)
		err(1, "pledge");

	/* Process arguments, set numfiles to file argument count. */
	getargs(argc, argv);
	if (numfiles == 0)
		usage();

	if (pledge("stdio", NULL) == -1)
		err(1, "pledge");

	/* Concatenate lines from each file, then print. */
	for (;;) {
		linep = line;
		/*
		 * For each file that has a line to print, numfile is
		 * incremented.  Thus if numfiles is 0, we are done.
		 */
		numfiles = 0;
		for (i = 0; i < INPUTSIZE - 1 && input[i].fp != NULL; i++)
			linep = gatherline(&input[i]);
		if (numfiles == 0)
			exit(0);
		fputs(line, stdout);
		/* Print terminating -s argument. */
		fputs(input[i].sepstring, stdout);
		if (!nofinalnl)
			putchar('\n');
	}
}

void
getargs(int argc, char *argv[])
{
	struct openfile *ip = input;
	char *p;
	int ch, P, S, F, T;
	size_t siz;

	P = S = F = T = 0;		/* capitalized options */
	while (optind < argc) {
		switch (ch = getopt(argc, argv, "F:f:P:p:S:s:T:t:")) {
		case 'P': case 'p':
			P = (ch == 'P');
			ip->pad = 1;
			/* FALLTHROUGH */
		case 'F': case 'f':
			F = (ch == 'F');
			/* Validate format string argument. */
			for (p = optarg; *p != '\0'; p++)
				if (!isdigit((unsigned char)*p) &&
				    *p != '.' && *p != '-')
					errx(1, "%s: invalid width specified",
					     optarg);
			/* '%' + width + 's' + '\0' */
			siz = p - optarg + 3;
			if ((p = realloc(ip->format, siz)) == NULL)
				err(1, NULL);
			snprintf(p, siz, "%%%ss", optarg);
			ip->format = p;
			break;
		case 'S': case 's':
			S = (ch == 'S');
			ip->sepstring = optarg;
			break;
		case 'T': case 't':
			T = (ch == 'T');
			if (strlen(optarg) != 1)
				usage();
			ip->eol = optarg[0];
			nofinalnl = 1;
			break;
		case -1:
			if (optind >= argc)
				break;		/* to support "--" */
			/* This is a file, not a flag. */
			++numfiles;
			if (numfiles >= INPUTSIZE)
				errx(1, "too many files");
			if (strcmp(argv[optind], "-") == 0)
				ip->fp = stdin;
			else if ((ip->fp = fopen(argv[optind], "r")) == NULL)
				err(1, "%s", argv[optind]);
			ip->pad = P;
			if (ip->sepstring == NULL)
				ip->sepstring = S ? (ip-1)->sepstring : "";
			if (ip->format == NULL)
				ip->format = (P || F) ? (ip-1)->format : "%s";
			if (ip->eol == '\0')
				ip->eol = T ? (ip-1)->eol : '\n';
			ip++;
			optind++;
			break;
		default:
			usage();
			/* NOTREACHED */
		}
	}
	ip->fp = NULL;
	if (ip->sepstring == NULL)
		ip->sepstring = "";
}

char *
pad(struct openfile *ip)
{
	size_t n;
	char *lp = linep;

	n = strlcpy(lp, ip->sepstring,  line + sizeof(line) - lp);
	lp += (n < line + sizeof(line) - lp) ? n : strlen(lp);
	if (ip->pad) {
		n = snprintf(lp, line + sizeof(line) - lp, ip->format, "");
		if (n > 0)
			lp += (n < line + sizeof(line) - lp) ? n : strlen(lp);
	}
	return (lp);
}

/*
 * Grab line from file, appending to linep.  Increments numfiles if file
 * is still open.
 */
char *
gatherline(struct openfile *ip)
{
	size_t n;
	char s[BUFSIZ];
	char *p;
	char *lp = linep;
	char *end = s + BUFSIZ - 1;
	int c;

	if (ip->eof)
		return (pad(ip));
	for (p = s; (c = fgetc(ip->fp)) != EOF && p < end; p++)
		if ((*p = c) == ip->eol)
			break;
	*p = '\0';
	if (c == EOF) {
		ip->eof = 1;
		if (ip->fp == stdin)
			fclose(stdin);
		return (pad(ip));
	}
	/* Something will be printed. */
	numfiles++;
	n = strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
	lp += (n < line + sizeof(line) - lp) ? n : strlen(lp);
	n = snprintf(lp, line + sizeof(line) - lp, ip->format, s);
	if (n > 0)
		lp += (n < line + sizeof(line) - lp) ? n : strlen(lp);
	return (lp);
}

void
usage(void)
{
	extern char *__progname;

	fprintf(stderr,
	    "usage: %s [-f min.max] [-p min.max] [-s sepstring] [-t c] file ...\n",
	    __progname);
	exit(1);
}