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https://github.com/freebsd/freebsd-src
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3abcc79c6a
This replaces fgetln() with getline(). The main reason for this is portability, making things easier for people who want to compile these tools on non-FreeBSD systems. I appreciate that's probably not the top concern for FreeBSD base tools, but fgetln() is impossible to port to most platforms, as concurrent access is essentially impossible to implement fully correct without the line buffer on the FILE struct. Other than this, many generic FreeBSD tools compile fairly cleanly on Linux with a few small changes. Most uses of fgetln() pre-date getline() support (added in 2009 with69099ba2ec
), and there's been some previous patches (ee3ca711a8
8c98e6b1a7
1a2a4fc8ce
) for other tools. Obtained from: https://github.com/dcantrell/bsdutils and https://github.com/chimera-linux/chimerautils Signed-off-by: Martin Tournoij <martin@arp242.net> Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/893
216 lines
5.2 KiB
C
216 lines
5.2 KiB
C
/*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1980, 1987, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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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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* 3. 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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#include <sys/capsicum.h>
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#include <sys/types.h>
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#include <capsicum_helpers.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <getopt.h>
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#include <inttypes.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 <libutil.h>
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#include <libcasper.h>
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#include <casper/cap_fileargs.h>
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/*
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* head - give the first few lines of a stream or of each of a set of files
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*
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* Bill Joy UCB August 24, 1977
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*/
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static void head(FILE *, intmax_t);
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static void head_bytes(FILE *, off_t);
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static void obsolete(char *[]);
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static void usage(void) __dead2;
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static const struct option long_opts[] =
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{
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{"bytes", required_argument, NULL, 'c'},
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{"lines", required_argument, NULL, 'n'},
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{"quiet", no_argument, NULL, 'q'},
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{"silent", no_argument, NULL, 'q'},
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{"verbose", no_argument, NULL, 'v'},
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{NULL, no_argument, NULL, 0}
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};
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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off_t bytecnt;
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intmax_t linecnt;
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int ch, first, eval;
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fileargs_t *fa;
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cap_rights_t rights;
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int qflag = 0;
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int vflag = 0;
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linecnt = -1;
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eval = 0;
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bytecnt = -1;
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obsolete(argv);
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while ((ch = getopt_long(argc, argv, "+n:c:qv", long_opts, NULL)) != -1) {
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switch(ch) {
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case 'c':
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if (expand_number(optarg, &bytecnt) || bytecnt <= 0)
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errx(1, "illegal byte count -- %s", optarg);
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break;
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case 'n':
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if (expand_number(optarg, &linecnt) || linecnt <= 0)
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errx(1, "illegal line count -- %s", optarg);
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break;
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case 'q':
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qflag = 1;
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vflag = 0;
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break;
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case 'v':
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qflag = 0;
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vflag = 1;
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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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fa = fileargs_init(argc, argv, O_RDONLY, 0,
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cap_rights_init(&rights, CAP_READ, CAP_FSTAT, CAP_FCNTL), FA_OPEN);
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if (fa == NULL)
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err(1, "unable to init casper");
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caph_cache_catpages();
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if (caph_limit_stdio() < 0 || caph_enter_casper() < 0)
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err(1, "unable to enter capability mode");
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if (linecnt != -1 && bytecnt != -1)
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errx(1, "can't combine line and byte counts");
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if (linecnt == -1)
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linecnt = 10;
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if (*argv != NULL) {
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for (first = 1; *argv != NULL; ++argv) {
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if ((fp = fileargs_fopen(fa, *argv, "r")) == NULL) {
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warn("%s", *argv);
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eval = 1;
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continue;
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}
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if (vflag || (qflag == 0 && argc > 1)) {
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(void)printf("%s==> %s <==\n",
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first ? "" : "\n", *argv);
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first = 0;
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}
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if (bytecnt == -1)
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head(fp, linecnt);
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else
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head_bytes(fp, bytecnt);
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(void)fclose(fp);
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}
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} else if (bytecnt == -1)
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head(stdin, linecnt);
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else
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head_bytes(stdin, bytecnt);
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fileargs_free(fa);
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exit(eval);
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}
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static void
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head(FILE *fp, intmax_t cnt)
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{
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char *cp = NULL;
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size_t error, bufsize = 0;
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ssize_t readlen;
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while (cnt != 0 && (readlen = getline(&cp, &bufsize, fp)) >= 0) {
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error = fwrite(cp, sizeof(char), readlen, stdout);
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if ((ssize_t)error != readlen)
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err(1, "stdout");
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cnt--;
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}
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}
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static void
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head_bytes(FILE *fp, off_t cnt)
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{
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char buf[4096];
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size_t readlen;
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while (cnt) {
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if ((uintmax_t)cnt < sizeof(buf))
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readlen = cnt;
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else
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readlen = sizeof(buf);
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readlen = fread(buf, sizeof(char), readlen, fp);
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if (readlen == 0)
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break;
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if (fwrite(buf, sizeof(char), readlen, stdout) != readlen)
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err(1, "stdout");
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cnt -= readlen;
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}
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}
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static void
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obsolete(char *argv[])
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{
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char *ap;
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while ((ap = *++argv)) {
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/* Return if "--" or not "-[0-9]*". */
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if (ap[0] != '-' || ap[1] == '-' || !isdigit(ap[1]))
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return;
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if ((ap = malloc(strlen(*argv) + 2)) == NULL)
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err(1, NULL);
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ap[0] = '-';
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ap[1] = 'n';
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(void)strcpy(ap + 2, *argv + 1);
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*argv = ap;
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}
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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: head [-n lines | -c bytes] [file ...]\n");
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exit(1);
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}
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