Import macOS userland

adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106

1 files changed, 199 insertions, 0 deletions

diff --git a/text_cmds/head/head.c b/text_cmds/head/head.c
new file mode 100644
index 0000000..d798e78
--- /dev/null
+++ b/text_cmds/head/head.c
@@ -0,0 +1,199 @@
+/*
+ * Copyright (c) 1980, 1987, 1992, 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. 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.
+ */
+
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1980, 1987, 1992, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)head.c	8.2 (Berkeley) 5/4/95";
+#endif
+#endif /* not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/usr.bin/head/head.c,v 1.20 2007/01/11 20:23:01 brooks Exp $");
+
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/*
+ * head - give the first few lines of a stream or of each of a set of files
+ *
+ * Bill Joy UCB August 24, 1977
+ */
+
+static void head(FILE *, int);
+static void head_bytes(FILE *, off_t);
+static void obsolete(char *[]);
+static void usage(void);
+
+int
+main(int argc, char *argv[])
+{
+	int ch;
+	FILE *fp;
+	int first, linecnt = -1, eval = 0;
+	off_t bytecnt = -1;
+	char *ep;
+
+	obsolete(argv);
+	while ((ch = getopt(argc, argv, "n:c:")) != -1)
+		switch(ch) {
+		case 'c':
+			bytecnt = strtoimax(optarg, &ep, 10);
+			if (*ep || bytecnt <= 0)
+				errx(1, "illegal byte count -- %s", optarg);
+			break;
+		case 'n':
+			linecnt = strtol(optarg, &ep, 10);
+			if (*ep || linecnt <= 0)
+				errx(1, "illegal line count -- %s", optarg);
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (linecnt != -1 && bytecnt != -1)
+		errx(1, "can't combine line and byte counts");
+	if (linecnt == -1 )
+		linecnt = 10;
+	if (*argv) {
+		for (first = 1; *argv; ++argv) {
+			if ((fp = fopen(*argv, "r")) == NULL) {
+				warn("%s", *argv);
+				eval = 1;
+				continue;
+			}
+			if (argc > 1) {
+				(void)printf("%s==> %s <==\n",
+				    first ? "" : "\n", *argv);
+				first = 0;
+			}
+			if (bytecnt == -1)
+				head(fp, linecnt);
+			else
+				head_bytes(fp, bytecnt);
+			if (ferror(fp)) {
+				warnx("Error reading %s", *argv);
+				eval = 1;
+			}
+			(void)fclose(fp);
+		}
+	} else {
+		if (bytecnt == -1) {
+			head(stdin, linecnt);
+		} else {
+			head_bytes(stdin, bytecnt);
+		}
+		if (ferror(stdin)) {
+			warnx("Error reading stdin");
+			eval = 1;
+		}
+	}
+
+	exit(eval);
+}
+
+static void
+head(FILE *fp, int cnt)
+{
+	char *cp;
+	size_t error, readlen;
+
+	while (cnt && (cp = fgetln(fp, &readlen)) != NULL) {
+		error = fwrite(cp, sizeof(char), readlen, stdout);
+		if (error != readlen)
+			err(1, "stdout");
+		cnt--;
+	}
+
+	fflush(fp);
+}
+
+static void
+head_bytes(FILE *fp, off_t cnt)
+{
+	char buf[4096];
+	size_t readlen;
+
+	while (cnt) {
+		if ((uintmax_t)cnt < sizeof(buf))
+			readlen = cnt;
+		else
+			readlen = sizeof(buf);
+		readlen = fread(buf, sizeof(char), readlen, fp);
+		if (readlen == 0)
+			break;
+		if (fwrite(buf, sizeof(char), readlen, stdout) != readlen)
+			err(1, "stdout");
+		cnt -= readlen;
+	}
+}
+
+static void
+obsolete(char *argv[])
+{
+	char *ap;
+
+	while ((ap = *++argv)) {
+		/* Return if "--" or not "-[0-9]*". */
+		if (ap[0] != '-' || ap[1] == '-' || !isdigit(ap[1]))
+			return;
+		if ((ap = malloc(strlen(*argv) + 2)) == NULL)
+			err(1, NULL);
+		ap[0] = '-';
+		ap[1] = 'n';
+		(void)strcpy(ap + 2, *argv + 1);
+		*argv = ap;
+	}
+}
+
+static void
+usage(void)
+{
+
+	(void)fprintf(stderr, "usage: head [-n lines | -c bytes] [file ...]\n");
+	exit(1);
+}