Import /usr/src/bin/sh from FreeBSD 12.0-RELEASE

1 files changed, 534 insertions, 0 deletions

diff --git a/bin/cash/miscbltin.c b/bin/cash/miscbltin.c
new file mode 100644
index 00000000..7f0c42e7
--- /dev/null
+++ b/bin/cash/miscbltin.c
@@ -0,0 +1,534 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * 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.
+ */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)miscbltin.c	8.4 (Berkeley) 5/4/95";
+#endif
+#endif /* not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: releng/12.0/bin/sh/miscbltin.c 326025 2017-11-20 19:49:47Z pfg $");
+
+/*
+ * Miscellaneous builtins.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "shell.h"
+#include "options.h"
+#include "var.h"
+#include "output.h"
+#include "memalloc.h"
+#include "error.h"
+#include "mystring.h"
+#include "syntax.h"
+#include "trap.h"
+
+#undef eflag
+
+int readcmd(int, char **);
+int umaskcmd(int, char **);
+int ulimitcmd(int, char **);
+
+/*
+ * The read builtin.  The -r option causes backslashes to be treated like
+ * ordinary characters.
+ *
+ * This uses unbuffered input, which may be avoidable in some cases.
+ *
+ * Note that if IFS=' :' then read x y should work so that:
+ * 'a b'	x='a', y='b'
+ * ' a b '	x='a', y='b'
+ * ':b'		x='',  y='b'
+ * ':'		x='',  y=''
+ * '::'		x='',  y=''
+ * ': :'	x='',  y=''
+ * ':::'	x='',  y='::'
+ * ':b c:'	x='',  y='b c:'
+ */
+
+int
+readcmd(int argc __unused, char **argv __unused)
+{
+	char **ap;
+	int backslash;
+	char c;
+	int rflag;
+	char *prompt;
+	const char *ifs;
+	char *p;
+	int startword;
+	int status;
+	int i;
+	int is_ifs;
+	int saveall = 0;
+	ptrdiff_t lastnonifs, lastnonifsws;
+	struct timeval tv;
+	char *tvptr;
+	fd_set ifds;
+	ssize_t nread;
+	int sig;
+
+	rflag = 0;
+	prompt = NULL;
+	tv.tv_sec = -1;
+	tv.tv_usec = 0;
+	while ((i = nextopt("erp:t:")) != '\0') {
+		switch(i) {
+		case 'p':
+			prompt = shoptarg;
+			break;
+		case 'e':
+			break;
+		case 'r':
+			rflag = 1;
+			break;
+		case 't':
+			tv.tv_sec = strtol(shoptarg, &tvptr, 0);
+			if (tvptr == shoptarg)
+				error("timeout value");
+			switch(*tvptr) {
+			case 0:
+			case 's':
+				break;
+			case 'h':
+				tv.tv_sec *= 60;
+				/* FALLTHROUGH */
+			case 'm':
+				tv.tv_sec *= 60;
+				break;
+			default:
+				error("timeout unit");
+			}
+			break;
+		}
+	}
+	if (prompt && isatty(0)) {
+		out2str(prompt);
+		flushall();
+	}
+	if (*(ap = argptr) == NULL)
+		error("arg count");
+	if ((ifs = bltinlookup("IFS", 1)) == NULL)
+		ifs = " \t\n";
+
+	if (tv.tv_sec >= 0) {
+		/*
+		 * Wait for something to become available.
+		 */
+		FD_ZERO(&ifds);
+		FD_SET(0, &ifds);
+		status = select(1, &ifds, NULL, NULL, &tv);
+		/*
+		 * If there's nothing ready, return an error.
+		 */
+		if (status <= 0) {
+			sig = pendingsig;
+			return (128 + (sig != 0 ? sig : SIGALRM));
+		}
+	}
+
+	status = 0;
+	startword = 2;
+	backslash = 0;
+	STARTSTACKSTR(p);
+	lastnonifs = lastnonifsws = -1;
+	for (;;) {
+		nread = read(STDIN_FILENO, &c, 1);
+		if (nread == -1) {
+			if (errno == EINTR) {
+				sig = pendingsig;
+				if (sig == 0)
+					continue;
+				status = 128 + sig;
+				break;
+			}
+			warning("read error: %s", strerror(errno));
+			status = 2;
+			break;
+		} else if (nread != 1) {
+			status = 1;
+			break;
+		}
+		if (c == '\0')
+			continue;
+		CHECKSTRSPACE(1, p);
+		if (backslash) {
+			backslash = 0;
+			if (c != '\n') {
+				startword = 0;
+				lastnonifs = lastnonifsws = p - stackblock();
+				USTPUTC(c, p);
+			}
+			continue;
+		}
+		if (!rflag && c == '\\') {
+			backslash++;
+			continue;
+		}
+		if (c == '\n')
+			break;
+		if (strchr(ifs, c))
+			is_ifs = strchr(" \t\n", c) ? 1 : 2;
+		else
+			is_ifs = 0;
+
+		if (startword != 0) {
+			if (is_ifs == 1) {
+				/* Ignore leading IFS whitespace */
+				if (saveall)
+					USTPUTC(c, p);
+				continue;
+			}
+			if (is_ifs == 2 && startword == 1) {
+				/* Only one non-whitespace IFS per word */
+				startword = 2;
+				if (saveall) {
+					lastnonifsws = p - stackblock();
+					USTPUTC(c, p);
+				}
+				continue;
+			}
+		}
+
+		if (is_ifs == 0) {
+			/* append this character to the current variable */
+			startword = 0;
+			if (saveall)
+				/* Not just a spare terminator */
+				saveall++;
+			lastnonifs = lastnonifsws = p - stackblock();
+			USTPUTC(c, p);
+			continue;
+		}
+
+		/* end of variable... */
+		startword = is_ifs;
+
+		if (ap[1] == NULL) {
+			/* Last variable needs all IFS chars */
+			saveall++;
+			if (is_ifs == 2)
+				lastnonifsws = p - stackblock();
+			USTPUTC(c, p);
+			continue;
+		}
+
+		STACKSTRNUL(p);
+		setvar(*ap, stackblock(), 0);
+		ap++;
+		STARTSTACKSTR(p);
+		lastnonifs = lastnonifsws = -1;
+	}
+	STACKSTRNUL(p);
+
+	/*
+	 * Remove trailing IFS chars: always remove whitespace, don't remove
+	 * non-whitespace unless it was naked
+	 */
+	if (saveall <= 1)
+		lastnonifsws = lastnonifs;
+	stackblock()[lastnonifsws + 1] = '\0';
+	setvar(*ap, stackblock(), 0);
+
+	/* Set any remaining args to "" */
+	while (*++ap != NULL)
+		setvar(*ap, "", 0);
+	return status;
+}
+
+
+
+int
+umaskcmd(int argc __unused, char **argv __unused)
+{
+	char *ap;
+	int mask;
+	int i;
+	int symbolic_mode = 0;
+
+	while ((i = nextopt("S")) != '\0') {
+		symbolic_mode = 1;
+	}
+
+	INTOFF;
+	mask = umask(0);
+	umask(mask);
+	INTON;
+
+	if ((ap = *argptr) == NULL) {
+		if (symbolic_mode) {
+			char u[4], g[4], o[4];
+
+			i = 0;
+			if ((mask & S_IRUSR) == 0)
+				u[i++] = 'r';
+			if ((mask & S_IWUSR) == 0)
+				u[i++] = 'w';
+			if ((mask & S_IXUSR) == 0)
+				u[i++] = 'x';
+			u[i] = '\0';
+
+			i = 0;
+			if ((mask & S_IRGRP) == 0)
+				g[i++] = 'r';
+			if ((mask & S_IWGRP) == 0)
+				g[i++] = 'w';
+			if ((mask & S_IXGRP) == 0)
+				g[i++] = 'x';
+			g[i] = '\0';
+
+			i = 0;
+			if ((mask & S_IROTH) == 0)
+				o[i++] = 'r';
+			if ((mask & S_IWOTH) == 0)
+				o[i++] = 'w';
+			if ((mask & S_IXOTH) == 0)
+				o[i++] = 'x';
+			o[i] = '\0';
+
+			out1fmt("u=%s,g=%s,o=%s\n", u, g, o);
+		} else {
+			out1fmt("%.4o\n", mask);
+		}
+	} else {
+		if (is_digit(*ap)) {
+			mask = 0;
+			do {
+				if (*ap >= '8' || *ap < '0')
+					error("Illegal number: %s", *argptr);
+				mask = (mask << 3) + (*ap - '0');
+			} while (*++ap != '\0');
+			umask(mask);
+		} else {
+			void *set;
+			INTOFF;
+			if ((set = setmode (ap)) == NULL)
+				error("Illegal number: %s", ap);
+
+			mask = getmode (set, ~mask & 0777);
+			umask(~mask & 0777);
+			free(set);
+			INTON;
+		}
+	}
+	return 0;
+}
+
+/*
+ * ulimit builtin
+ *
+ * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
+ * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
+ * ash by J.T. Conklin.
+ *
+ * Public domain.
+ */
+
+struct limits {
+	const char *name;
+	const char *units;
+	int	cmd;
+	short	factor;	/* multiply by to get rlim_{cur,max} values */
+	char	option;
+};
+
+static const struct limits limits[] = {
+#ifdef RLIMIT_CPU
+	{ "cpu time",		"seconds",	RLIMIT_CPU,	   1, 't' },
+#endif
+#ifdef RLIMIT_FSIZE
+	{ "file size",		"512-blocks",	RLIMIT_FSIZE,	 512, 'f' },
+#endif
+#ifdef RLIMIT_DATA
+	{ "data seg size",	"kbytes",	RLIMIT_DATA,	1024, 'd' },
+#endif
+#ifdef RLIMIT_STACK
+	{ "stack size",		"kbytes",	RLIMIT_STACK,	1024, 's' },
+#endif
+#ifdef  RLIMIT_CORE
+	{ "core file size",	"512-blocks",	RLIMIT_CORE,	 512, 'c' },
+#endif
+#ifdef RLIMIT_RSS
+	{ "max memory size",	"kbytes",	RLIMIT_RSS,	1024, 'm' },
+#endif
+#ifdef RLIMIT_MEMLOCK
+	{ "locked memory",	"kbytes",	RLIMIT_MEMLOCK, 1024, 'l' },
+#endif
+#ifdef RLIMIT_NPROC
+	{ "max user processes",	(char *)0,	RLIMIT_NPROC,      1, 'u' },
+#endif
+#ifdef RLIMIT_NOFILE
+	{ "open files",		(char *)0,	RLIMIT_NOFILE,     1, 'n' },
+#endif
+#ifdef RLIMIT_VMEM
+	{ "virtual mem size",	"kbytes",	RLIMIT_VMEM,	1024, 'v' },
+#endif
+#ifdef RLIMIT_SWAP
+	{ "swap limit",		"kbytes",	RLIMIT_SWAP,	1024, 'w' },
+#endif
+#ifdef RLIMIT_SBSIZE
+	{ "socket buffer size",	"bytes",	RLIMIT_SBSIZE,	   1, 'b' },
+#endif
+#ifdef RLIMIT_NPTS
+	{ "pseudo-terminals",	(char *)0,	RLIMIT_NPTS,	   1, 'p' },
+#endif
+#ifdef RLIMIT_KQUEUES
+	{ "kqueues",		(char *)0,	RLIMIT_KQUEUES,	   1, 'k' },
+#endif
+#ifdef RLIMIT_UMTXP
+	{ "umtx shared locks",	(char *)0,	RLIMIT_UMTXP,	   1, 'o' },
+#endif
+	{ (char *) 0,		(char *)0,	0,		   0, '\0' }
+};
+
+enum limithow { SOFT = 0x1, HARD = 0x2 };
+
+static void
+printlimit(enum limithow how, const struct rlimit *limit,
+    const struct limits *l)
+{
+	rlim_t val = 0;
+
+	if (how & SOFT)
+		val = limit->rlim_cur;
+	else if (how & HARD)
+		val = limit->rlim_max;
+	if (val == RLIM_INFINITY)
+		out1str("unlimited\n");
+	else
+	{
+		val /= l->factor;
+		out1fmt("%jd\n", (intmax_t)val);
+	}
+}
+
+int
+ulimitcmd(int argc __unused, char **argv __unused)
+{
+	rlim_t val = 0;
+	enum limithow how = SOFT | HARD;
+	const struct limits	*l;
+	int		set, all = 0;
+	int		optc, what;
+	struct rlimit	limit;
+
+	what = 'f';
+	while ((optc = nextopt("HSatfdsmcnuvlbpwko")) != '\0')
+		switch (optc) {
+		case 'H':
+			how = HARD;
+			break;
+		case 'S':
+			how = SOFT;
+			break;
+		case 'a':
+			all = 1;
+			break;
+		default:
+			what = optc;
+		}
+
+	for (l = limits; l->name && l->option != what; l++)
+		;
+	if (!l->name)
+		error("internal error (%c)", what);
+
+	set = *argptr ? 1 : 0;
+	if (set) {
+		char *p = *argptr;
+
+		if (all || argptr[1])
+			error("too many arguments");
+		if (strcmp(p, "unlimited") == 0)
+			val = RLIM_INFINITY;
+		else {
+			char *end;
+			uintmax_t uval;
+
+			if (*p < '0' || *p > '9')
+				error("bad number");
+			errno = 0;
+			uval = strtoumax(p, &end, 10);
+			if (errno != 0 || *end != '\0')
+				error("bad number");
+			if (uval > UINTMAX_MAX / l->factor)
+				error("bad number");
+			uval *= l->factor;
+			val = (rlim_t)uval;
+			if (val < 0 || (uintmax_t)val != uval ||
+			    val == RLIM_INFINITY)
+				error("bad number");
+		}
+	}
+	if (all) {
+		for (l = limits; l->name; l++) {
+			char optbuf[40];
+			if (getrlimit(l->cmd, &limit) < 0)
+				error("can't get limit: %s", strerror(errno));
+
+			if (l->units)
+				snprintf(optbuf, sizeof(optbuf),
+					"(%s, -%c) ", l->units, l->option);
+			else
+				snprintf(optbuf, sizeof(optbuf),
+					"(-%c) ", l->option);
+			out1fmt("%-18s %18s ", l->name, optbuf);
+			printlimit(how, &limit, l);
+		}
+		return 0;
+	}
+
+	if (getrlimit(l->cmd, &limit) < 0)
+		error("can't get limit: %s", strerror(errno));
+	if (set) {
+		if (how & SOFT)
+			limit.rlim_cur = val;
+		if (how & HARD)
+			limit.rlim_max = val;
+		if (setrlimit(l->cmd, &limit) < 0)
+			error("bad limit: %s", strerror(errno));
+	} else
+		printlimit(how, &limit, l);
+	return 0;
+}