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+/* $NetBSD: eval.c,v 1.170 2019/01/21 14:18:59 kre Exp $ */
+
+/*-
+ * Copyright (c) 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)eval.c 8.9 (Berkeley) 6/8/95";
+#else
+__RCSID("$NetBSD: eval.c,v 1.170 2019/01/21 14:18:59 kre Exp $");
+#endif
+#endif /* not lint */
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+#include <unistd.h>
+#include <sys/fcntl.h>
+#include <sys/stat.h>
+#include <sys/times.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/sysctl.h>
+
+/*
+ * Evaluate a command.
+ */
+
+#include "shell.h"
+#include "nodes.h"
+#include "syntax.h"
+#include "expand.h"
+#include "parser.h"
+#include "jobs.h"
+#include "eval.h"
+#include "builtins.h"
+#include "options.h"
+#include "exec.h"
+#include "redir.h"
+#include "input.h"
+#include "output.h"
+#include "trap.h"
+#include "var.h"
+#include "memalloc.h"
+#include "error.h"
+#include "show.h"
+#include "mystring.h"
+#include "main.h"
+#ifndef SMALL
+#include "nodenames.h"
+#include "myhistedit.h"
+#endif
+
+
+STATIC struct skipsave s_k_i_p;
+#define evalskip (s_k_i_p.state)
+#define skipcount (s_k_i_p.count)
+
+STATIC int loopnest; /* current loop nesting level */
+STATIC int funcnest; /* depth of function calls */
+STATIC int builtin_flags; /* evalcommand flags for builtins */
+/*
+ * Base function nesting level inside a dot command. Set to 0 initially
+ * and to (funcnest + 1) before every dot command to enable
+ * 1) detection of being in a file sourced by a dot command and
+ * 2) counting of function nesting in that file for the implementation
+ * of the return command.
+ * The value is reset to its previous value after the dot command.
+ */
+STATIC int dot_funcnest;
+
+
+const char *commandname;
+struct strlist *cmdenviron;
+int exitstatus; /* exit status of last command */
+int back_exitstatus; /* exit status of backquoted command */
+
+
+STATIC void evalloop(union node *, int);
+STATIC void evalfor(union node *, int);
+STATIC void evalcase(union node *, int);
+STATIC void evalsubshell(union node *, int);
+STATIC void expredir(union node *);
+STATIC void evalredir(union node *, int);
+STATIC void evalpipe(union node *);
+STATIC void evalcommand(union node *, int, struct backcmd *);
+STATIC void prehash(union node *);
+
+STATIC char *find_dot_file(char *);
+
+/*
+ * Called to reset things after an exception.
+ */
+
+#ifdef mkinit
+INCLUDE "eval.h"
+
+RESET {
+ reset_eval();
+}
+
+SHELLPROC {
+ exitstatus = 0;
+}
+#endif
+
+void
+reset_eval(void)
+{
+ evalskip = SKIPNONE;
+ dot_funcnest = 0;
+ loopnest = 0;
+ funcnest = 0;
+}
+
+static int
+sh_pipe(int fds[2])
+{
+ int nfd;
+
+ if (pipe(fds))
+ return -1;
+
+ if (fds[0] < 3) {
+ nfd = fcntl(fds[0], F_DUPFD, 3);
+ if (nfd != -1) {
+ close(fds[0]);
+ fds[0] = nfd;
+ }
+ }
+
+ if (fds[1] < 3) {
+ nfd = fcntl(fds[1], F_DUPFD, 3);
+ if (nfd != -1) {
+ close(fds[1]);
+ fds[1] = nfd;
+ }
+ }
+ return 0;
+}
+
+
+/*
+ * The eval commmand.
+ */
+
+int
+evalcmd(int argc, char **argv)
+{
+ char *p;
+ char *concat;
+ char **ap;
+
+ if (argc > 1) {
+ p = argv[1];
+ if (argc > 2) {
+ STARTSTACKSTR(concat);
+ ap = argv + 2;
+ for (;;) {
+ while (*p)
+ STPUTC(*p++, concat);
+ if ((p = *ap++) == NULL)
+ break;
+ STPUTC(' ', concat);
+ }
+ STPUTC('\0', concat);
+ p = grabstackstr(concat);
+ }
+ evalstring(p, builtin_flags & EV_TESTED);
+ } else
+ exitstatus = 0;
+ return exitstatus;
+}
+
+
+/*
+ * Execute a command or commands contained in a string.
+ */
+
+void
+evalstring(char *s, int flag)
+{
+ union node *n;
+ struct stackmark smark;
+ int last;
+ int any;
+
+ last = flag & EV_EXIT;
+ flag &= ~EV_EXIT;
+
+ setstackmark(&smark);
+ setinputstring(s, 1, line_number);
+
+ any = 0; /* to determine if exitstatus will have been set */
+ while ((n = parsecmd(0)) != NEOF) {
+ XTRACE(DBG_EVAL, ("evalstring: "), showtree(n));
+ if (n && nflag == 0) {
+ if (last && at_eof())
+ evaltree(n, flag | EV_EXIT);
+ else
+ evaltree(n, flag);
+ any = 1;
+ if (evalskip)
+ break;
+ }
+ rststackmark(&smark);
+ }
+ popfile();
+ popstackmark(&smark);
+ if (!any)
+ exitstatus = 0;
+ if (last)
+ exraise(EXEXIT);
+}
+
+
+
+/*
+ * Evaluate a parse tree. The value is left in the global variable
+ * exitstatus.
+ */
+
+void
+evaltree(union node *n, int flags)
+{
+ bool do_etest;
+ int sflags = flags & ~EV_EXIT;
+ union node *next;
+ struct stackmark smark;
+
+ do_etest = false;
+ if (n == NULL || nflag) {
+ VTRACE(DBG_EVAL, ("evaltree(%s) called\n",
+ n == NULL ? "NULL" : "-n"));
+ if (nflag == 0)
+ exitstatus = 0;
+ goto out2;
+ }
+
+ setstackmark(&smark);
+ do {
+#ifndef SMALL
+ displayhist = 1; /* show history substitutions done with fc */
+#endif
+ next = NULL;
+ CTRACE(DBG_EVAL, ("pid %d, evaltree(%p: %s(%d), %#x) called\n",
+ getpid(), n, NODETYPENAME(n->type), n->type, flags));
+ if (n->type != NCMD && traps_invalid)
+ free_traps();
+ switch (n->type) {
+ case NSEMI:
+ evaltree(n->nbinary.ch1, sflags);
+ if (nflag || evalskip)
+ goto out1;
+ next = n->nbinary.ch2;
+ break;
+ case NAND:
+ evaltree(n->nbinary.ch1, EV_TESTED);
+ if (nflag || evalskip || exitstatus != 0)
+ goto out1;
+ next = n->nbinary.ch2;
+ break;
+ case NOR:
+ evaltree(n->nbinary.ch1, EV_TESTED);
+ if (nflag || evalskip || exitstatus == 0)
+ goto out1;
+ next = n->nbinary.ch2;
+ break;
+ case NREDIR:
+ evalredir(n, flags);
+ break;
+ case NSUBSHELL:
+ evalsubshell(n, flags);
+ do_etest = !(flags & EV_TESTED);
+ break;
+ case NBACKGND:
+ evalsubshell(n, flags);
+ break;
+ case NIF: {
+ evaltree(n->nif.test, EV_TESTED);
+ if (nflag || evalskip)
+ goto out1;
+ if (exitstatus == 0)
+ next = n->nif.ifpart;
+ else if (n->nif.elsepart)
+ next = n->nif.elsepart;
+ else
+ exitstatus = 0;
+ break;
+ }
+ case NWHILE:
+ case NUNTIL:
+ evalloop(n, sflags);
+ break;
+ case NFOR:
+ evalfor(n, sflags);
+ break;
+ case NCASE:
+ evalcase(n, sflags);
+ break;
+ case NDEFUN:
+ CTRACE(DBG_EVAL, ("Defining fn %s @%d%s\n",
+ n->narg.text, n->narg.lineno,
+ fnline1 ? " LINENO=1" : ""));
+ defun(n->narg.text, n->narg.next, n->narg.lineno);
+ exitstatus = 0;
+ break;
+ case NNOT:
+ evaltree(n->nnot.com, EV_TESTED);
+ exitstatus = !exitstatus;
+ break;
+ case NDNOT:
+ evaltree(n->nnot.com, EV_TESTED);
+ if (exitstatus != 0)
+ exitstatus = 1;
+ break;
+ case NPIPE:
+ evalpipe(n);
+ do_etest = !(flags & EV_TESTED);
+ break;
+ case NCMD:
+ evalcommand(n, flags, NULL);
+ do_etest = !(flags & EV_TESTED);
+ break;
+ default:
+#ifdef NODETYPENAME
+ out1fmt("Node type = %d(%s)\n",
+ n->type, NODETYPENAME(n->type));
+#else
+ out1fmt("Node type = %d\n", n->type);
+#endif
+ flushout(&output);
+ break;
+ }
+ n = next;
+ rststackmark(&smark);
+ } while(n != NULL);
+ out1:
+ popstackmark(&smark);
+ out2:
+ if (pendingsigs)
+ dotrap();
+ if (eflag && exitstatus != 0 && do_etest)
+ exitshell(exitstatus);
+ if (flags & EV_EXIT)
+ exraise(EXEXIT);
+}
+
+
+STATIC void
+evalloop(union node *n, int flags)
+{
+ int status;
+
+ loopnest++;
+ status = 0;
+
+ CTRACE(DBG_EVAL, ("evalloop %s:", NODETYPENAME(n->type)));
+ VXTRACE(DBG_EVAL, (" "), showtree(n->nbinary.ch1));
+ VXTRACE(DBG_EVAL, ("evalloop do: "), showtree(n->nbinary.ch2));
+ VTRACE(DBG_EVAL, ("evalloop done\n"));
+ CTRACE(DBG_EVAL, ("\n"));
+
+ for (;;) {
+ evaltree(n->nbinary.ch1, EV_TESTED);
+ if (nflag)
+ break;
+ if (evalskip) {
+ skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
+ evalskip = SKIPNONE;
+ continue;
+ }
+ if (evalskip == SKIPBREAK && --skipcount <= 0)
+ evalskip = SKIPNONE;
+ break;
+ }
+ if (n->type == NWHILE) {
+ if (exitstatus != 0)
+ break;
+ } else {
+ if (exitstatus == 0)
+ break;
+ }
+ evaltree(n->nbinary.ch2, flags & EV_TESTED);
+ status = exitstatus;
+ if (evalskip)
+ goto skipping;
+ }
+ loopnest--;
+ exitstatus = status;
+}
+
+
+
+STATIC void
+evalfor(union node *n, int flags)
+{
+ struct arglist arglist;
+ union node *argp;
+ struct strlist *sp;
+ struct stackmark smark;
+ int status;
+
+ status = nflag ? exitstatus : 0;
+
+ setstackmark(&smark);
+ arglist.lastp = &arglist.list;
+ for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
+ expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
+ if (evalskip)
+ goto out;
+ }
+ *arglist.lastp = NULL;
+
+ loopnest++;
+ for (sp = arglist.list ; sp ; sp = sp->next) {
+ if (xflag) {
+ outxstr(expandstr(ps4val(), line_number));
+ outxstr("for ");
+ outxstr(n->nfor.var);
+ outxc('=');
+ outxshstr(sp->text);
+ outxc('\n');
+ flushout(outx);
+ }
+
+ setvar(n->nfor.var, sp->text, 0);
+ evaltree(n->nfor.body, flags & EV_TESTED);
+ status = exitstatus;
+ if (nflag)
+ break;
+ if (evalskip) {
+ if (evalskip == SKIPCONT && --skipcount <= 0) {
+ evalskip = SKIPNONE;
+ continue;
+ }
+ if (evalskip == SKIPBREAK && --skipcount <= 0)
+ evalskip = SKIPNONE;
+ break;
+ }
+ }
+ loopnest--;
+ exitstatus = status;
+ out:
+ popstackmark(&smark);
+}
+
+
+
+STATIC void
+evalcase(union node *n, int flags)
+{
+ union node *cp, *ncp;
+ union node *patp;
+ struct arglist arglist;
+ struct stackmark smark;
+ int status = 0;
+
+ setstackmark(&smark);
+ arglist.lastp = &arglist.list;
+ line_number = n->ncase.lineno;
+ expandarg(n->ncase.expr, &arglist, EXP_TILDE);
+ for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
+ for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
+ line_number = patp->narg.lineno;
+ if (casematch(patp, arglist.list->text)) {
+ while (cp != NULL && evalskip == 0 &&
+ nflag == 0) {
+ if (cp->type == NCLISTCONT)
+ ncp = cp->nclist.next;
+ else
+ ncp = NULL;
+ line_number = cp->nclist.lineno;
+ evaltree(cp->nclist.body, flags);
+ status = exitstatus;
+ cp = ncp;
+ }
+ goto out;
+ }
+ }
+ }
+ out:
+ exitstatus = status;
+ popstackmark(&smark);
+}
+
+
+
+/*
+ * Kick off a subshell to evaluate a tree.
+ */
+
+STATIC void
+evalsubshell(union node *n, int flags)
+{
+ struct job *jp= NULL;
+ int backgnd = (n->type == NBACKGND);
+
+ expredir(n->nredir.redirect);
+ if (xflag && n->nredir.redirect) {
+ union node *rn;
+
+ outxstr(expandstr(ps4val(), line_number));
+ outxstr("using redirections:");
+ for (rn = n->nredir.redirect; rn; rn = rn->nfile.next)
+ (void) outredir(outx, rn, ' ');
+ outxstr(" do subshell ("/*)*/);
+ if (backgnd)
+ outxstr(/*(*/") &");
+ outxc('\n');
+ flushout(outx);
+ }
+ if ((!backgnd && flags & EV_EXIT && !have_traps()) ||
+ forkshell(jp = makejob(n, 1), n, backgnd?FORK_BG:FORK_FG) == 0) {
+ INTON;
+ if (backgnd)
+ flags &=~ EV_TESTED;
+ redirect(n->nredir.redirect, REDIR_KEEP);
+ evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */
+ } else if (!backgnd) {
+ INTOFF;
+ exitstatus = waitforjob(jp);
+ INTON;
+ } else
+ exitstatus = 0;
+
+ if (!backgnd && xflag && n->nredir.redirect) {
+ outxstr(expandstr(ps4val(), line_number));
+ outxstr(/*(*/") done subshell\n");
+ flushout(outx);
+ }
+}
+
+
+
+/*
+ * Compute the names of the files in a redirection list.
+ */
+
+STATIC void
+expredir(union node *n)
+{
+ union node *redir;
+
+ for (redir = n ; redir ; redir = redir->nfile.next) {
+ struct arglist fn;
+
+ fn.lastp = &fn.list;
+ switch (redir->type) {
+ case NFROMTO:
+ case NFROM:
+ case NTO:
+ case NCLOBBER:
+ case NAPPEND:
+ expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
+ redir->nfile.expfname = fn.list->text;
+ break;
+ case NFROMFD:
+ case NTOFD:
+ if (redir->ndup.vname) {
+ expandarg(redir->ndup.vname, &fn, EXP_TILDE | EXP_REDIR);
+ fixredir(redir, fn.list->text, 1);
+ }
+ break;
+ }
+ }
+}
+
+/*
+ * Perform redirections for a compound command, and then do it (and restore)
+ */
+STATIC void
+evalredir(union node *n, int flags)
+{
+ struct jmploc jmploc;
+ struct jmploc * const savehandler = handler;
+ volatile int in_redirect = 1;
+ const char * volatile PS4 = NULL;
+
+ expredir(n->nredir.redirect);
+
+ if (xflag && n->nredir.redirect) {
+ union node *rn;
+
+ outxstr(PS4 = expandstr(ps4val(), line_number));
+ outxstr("using redirections:");
+ for (rn = n->nredir.redirect; rn != NULL; rn = rn->nfile.next)
+ (void) outredir(outx, rn, ' ');
+ outxstr(" do {\n"); /* } */
+ flushout(outx);
+ }
+
+ if (setjmp(jmploc.loc)) {
+ int e;
+
+ handler = savehandler;
+ e = exception;
+ popredir();
+ if (PS4 != NULL) {
+ outxstr(PS4);
+ /* { */ outxstr("} failed\n");
+ flushout(outx);
+ }
+ if (e == EXERROR || e == EXEXEC) {
+ if (in_redirect) {
+ exitstatus = 2;
+ return;
+ }
+ }
+ longjmp(handler->loc, 1);
+ } else {
+ INTOFF;
+ handler = &jmploc;
+ redirect(n->nredir.redirect, REDIR_PUSH | REDIR_KEEP);
+ in_redirect = 0;
+ INTON;
+ evaltree(n->nredir.n, flags);
+ }
+ INTOFF;
+ handler = savehandler;
+ popredir();
+ INTON;
+
+ if (PS4 != NULL) {
+ outxstr(PS4);
+ /* { */ outxstr("} done\n");
+ flushout(outx);
+ }
+}
+
+
+/*
+ * Evaluate a pipeline. All the processes in the pipeline are children
+ * of the process creating the pipeline. (This differs from some versions
+ * of the shell, which make the last process in a pipeline the parent
+ * of all the rest.)
+ */
+
+STATIC void
+evalpipe(union node *n)
+{
+ struct job *jp;
+ struct nodelist *lp;
+ int pipelen;
+ int prevfd;
+ int pip[2];
+
+ CTRACE(DBG_EVAL, ("evalpipe(%p) called\n", n));
+ pipelen = 0;
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
+ pipelen++;
+ INTOFF;
+ jp = makejob(n, pipelen);
+ prevfd = -1;
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
+ prehash(lp->n);
+ pip[1] = -1;
+ if (lp->next) {
+ if (sh_pipe(pip) < 0) {
+ if (prevfd >= 0)
+ close(prevfd);
+ error("Pipe call failed: %s", strerror(errno));
+ }
+ }
+ if (forkshell(jp, lp->n,
+ n->npipe.backgnd ? FORK_BG : FORK_FG) == 0) {
+ INTON;
+ if (prevfd > 0)
+ movefd(prevfd, 0);
+ if (pip[1] >= 0) {
+ close(pip[0]);
+ movefd(pip[1], 1);
+ }
+ evaltree(lp->n, EV_EXIT);
+ }
+ if (prevfd >= 0)
+ close(prevfd);
+ prevfd = pip[0];
+ close(pip[1]);
+ }
+ if (n->npipe.backgnd == 0) {
+ INTOFF;
+ exitstatus = waitforjob(jp);
+ CTRACE(DBG_EVAL, ("evalpipe: job done exit status %d\n",
+ exitstatus));
+ INTON;
+ } else
+ exitstatus = 0;
+ INTON;
+}
+
+
+
+/*
+ * Execute a command inside back quotes. If it's a builtin command, we
+ * want to save its output in a block obtained from malloc. Otherwise
+ * we fork off a subprocess and get the output of the command via a pipe.
+ * Should be called with interrupts off.
+ */
+
+void
+evalbackcmd(union node *n, struct backcmd *result)
+{
+ int pip[2];
+ struct job *jp;
+ struct stackmark smark; /* unnecessary (because we fork) */
+
+ result->fd = -1;
+ result->buf = NULL;
+ result->nleft = 0;
+ result->jp = NULL;
+
+ if (nflag || n == NULL)
+ goto out;
+
+ setstackmark(&smark);
+
+#ifdef notyet
+ /*
+ * For now we disable executing builtins in the same
+ * context as the shell, because we are not keeping
+ * enough state to recover from changes that are
+ * supposed only to affect subshells. eg. echo "`cd /`"
+ */
+ if (n->type == NCMD) {
+ exitstatus = oexitstatus; /* XXX o... no longer exists */
+ evalcommand(n, EV_BACKCMD, result);
+ } else
+#endif
+ {
+ INTOFF;
+ if (sh_pipe(pip) < 0)
+ error("Pipe call failed");
+ jp = makejob(n, 1);
+ if (forkshell(jp, n, FORK_NOJOB) == 0) {
+ FORCEINTON;
+ close(pip[0]);
+ movefd(pip[1], 1);
+ eflag = 0;
+ evaltree(n, EV_EXIT);
+ /* NOTREACHED */
+ }
+ close(pip[1]);
+ result->fd = pip[0];
+ result->jp = jp;
+ INTON;
+ }
+ popstackmark(&smark);
+ out:
+ CTRACE(DBG_EVAL, ("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
+ result->fd, result->buf, result->nleft, result->jp));
+}
+
+const char *
+syspath(void)
+{
+ static char *sys_path = NULL;
+ static int mib[] = {CTL_USER, USER_CS_PATH};
+ static char def_path[] = "PATH=/usr/bin:/bin:/usr/sbin:/sbin";
+ size_t len;
+
+ if (sys_path == NULL) {
+ if (sysctl(mib, 2, 0, &len, 0, 0) != -1 &&
+ (sys_path = ckmalloc(len + 5)) != NULL &&
+ sysctl(mib, 2, sys_path + 5, &len, 0, 0) != -1) {
+ memcpy(sys_path, "PATH=", 5);
+ } else {
+ ckfree(sys_path);
+ /* something to keep things happy */
+ sys_path = def_path;
+ }
+ }
+ return sys_path;
+}
+
+static int
+parse_command_args(int argc, char **argv, int *use_syspath)
+{
+ int sv_argc = argc;
+ char *cp, c;
+
+ *use_syspath = 0;
+
+ for (;;) {
+ argv++;
+ if (--argc == 0)
+ break;
+ cp = *argv;
+ if (*cp++ != '-')
+ break;
+ if (*cp == '-' && cp[1] == 0) {
+ argv++;
+ argc--;
+ break;
+ }
+ while ((c = *cp++)) {
+ switch (c) {
+ case 'p':
+ *use_syspath = 1;
+ break;
+ default:
+ /* run 'typecmd' for other options */
+ return 0;
+ }
+ }
+ }
+ return sv_argc - argc;
+}
+
+int vforked = 0;
+extern char *trap[];
+
+/*
+ * Execute a simple command.
+ */
+
+STATIC void
+evalcommand(union node *cmd, int flgs, struct backcmd *backcmd)
+{
+ struct stackmark smark;
+ union node *argp;
+ struct arglist arglist;
+ struct arglist varlist;
+ volatile int flags = flgs;
+ char ** volatile argv;
+ volatile int argc;
+ char **envp;
+ int varflag;
+ struct strlist *sp;
+ volatile int mode;
+ int pip[2];
+ struct cmdentry cmdentry;
+ struct job * volatile jp;
+ struct jmploc jmploc;
+ struct jmploc *volatile savehandler = NULL;
+ const char *volatile savecmdname;
+ volatile struct shparam saveparam;
+ struct localvar *volatile savelocalvars;
+ struct parsefile *volatile savetopfile;
+ volatile int e;
+ char * volatile lastarg;
+ const char * volatile path = pathval();
+ volatile int temp_path;
+ const int savefuncline = funclinebase;
+ const int savefuncabs = funclineabs;
+ volatile int cmd_flags = 0;
+
+ vforked = 0;
+ /* First expand the arguments. */
+ CTRACE(DBG_EVAL, ("evalcommand(%p, %d) called [%s]\n", cmd, flags,
+ cmd->ncmd.args ? cmd->ncmd.args->narg.text : ""));
+ setstackmark(&smark);
+ back_exitstatus = 0;
+
+ line_number = cmd->ncmd.lineno;
+
+ arglist.lastp = &arglist.list;
+ varflag = 1;
+ /* Expand arguments, ignoring the initial 'name=value' ones */
+ for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) {
+ if (varflag && isassignment(argp->narg.text))
+ continue;
+ varflag = 0;
+ line_number = argp->narg.lineno;
+ expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
+ }
+ *arglist.lastp = NULL;
+
+ expredir(cmd->ncmd.redirect);
+
+ /* Now do the initial 'name=value' ones we skipped above */
+ varlist.lastp = &varlist.list;
+ for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) {
+ line_number = argp->narg.lineno;
+ if (!isassignment(argp->narg.text))
+ break;
+ expandarg(argp, &varlist, EXP_VARTILDE);
+ }
+ *varlist.lastp = NULL;
+
+ argc = 0;
+ for (sp = arglist.list ; sp ; sp = sp->next)
+ argc++;
+ argv = stalloc(sizeof (char *) * (argc + 1));
+
+ for (sp = arglist.list ; sp ; sp = sp->next) {
+ VTRACE(DBG_EVAL, ("evalcommand arg: %s\n", sp->text));
+ *argv++ = sp->text;
+ }
+ *argv = NULL;
+ lastarg = NULL;
+ if (iflag && funcnest == 0 && argc > 0)
+ lastarg = argv[-1];
+ argv -= argc;
+
+ /* Print the command if xflag is set. */
+ if (xflag) {
+ char sep = 0;
+ union node *rn;
+
+ outxstr(expandstr(ps4val(), line_number));
+ for (sp = varlist.list ; sp ; sp = sp->next) {
+ char *p;
+
+ if (sep != 0)
+ outxc(sep);
+
+ /*
+ * The "var=" part should not be quoted, regardless
+ * of the value, or it would not represent an
+ * assignment, but rather a command
+ */
+ p = strchr(sp->text, '=');
+ if (p != NULL) {
+ *p = '\0'; /*XXX*/
+ outxshstr(sp->text);
+ outxc('=');
+ *p++ = '='; /*XXX*/
+ } else
+ p = sp->text;
+ outxshstr(p);
+ sep = ' ';
+ }
+ for (sp = arglist.list ; sp ; sp = sp->next) {
+ if (sep != 0)
+ outxc(sep);
+ outxshstr(sp->text);
+ sep = ' ';
+ }
+ for (rn = cmd->ncmd.redirect; rn; rn = rn->nfile.next)
+ if (outredir(outx, rn, sep))
+ sep = ' ';
+ outxc('\n');
+ flushout(outx);
+ }
+
+ /* Now locate the command. */
+ if (argc == 0) {
+ /*
+ * the empty command begins as a normal builtin, and
+ * remains that way while redirects are processed, then
+ * will become special before we get to doing the
+ * var assigns.
+ */
+ cmdentry.cmdtype = CMDBUILTIN;
+ cmdentry.u.bltin = bltincmd;
+ } else {
+ static const char PATH[] = "PATH=";
+
+ /*
+ * Modify the command lookup path, if a PATH= assignment
+ * is present
+ */
+ for (sp = varlist.list; sp; sp = sp->next)
+ if (strncmp(sp->text, PATH, sizeof(PATH) - 1) == 0)
+ path = sp->text + sizeof(PATH) - 1;
+
+ do {
+ int argsused, use_syspath;
+
+ find_command(argv[0], &cmdentry, cmd_flags, path);
+#if 0
+ /*
+ * This short circuits all of the processing that
+ * should be done (including processing the
+ * redirects), so just don't ...
+ *
+ * (eventually this whole #if'd block will vanish)
+ */
+ if (cmdentry.cmdtype == CMDUNKNOWN) {
+ exitstatus = 127;
+ flushout(&errout);
+ goto out;
+ }
+#endif
+
+ /* implement the 'command' builtin here */
+ if (cmdentry.cmdtype != CMDBUILTIN ||
+ cmdentry.u.bltin != bltincmd)
+ break;
+ cmd_flags |= DO_NOFUNC;
+ argsused = parse_command_args(argc, argv, &use_syspath);
+ if (argsused == 0) {
+ /* use 'type' builtin to display info */
+ cmdentry.u.bltin = typecmd;
+ break;
+ }
+ argc -= argsused;
+ argv += argsused;
+ if (use_syspath)
+ path = syspath() + 5;
+ } while (argc != 0);
+ if (cmdentry.cmdtype == CMDSPLBLTIN && cmd_flags & DO_NOFUNC)
+ /* posix mandates that 'command <splbltin>' act as if
+ <splbltin> was a normal builtin */
+ cmdentry.cmdtype = CMDBUILTIN;
+ }
+
+ /*
+ * When traps are invalid, we permit the following:
+ * trap
+ * command trap
+ * eval trap
+ * command eval trap
+ * eval command trap
+ * without zapping the traps completely, in all other cases we do.
+ *
+ * The test here permits eval "anything" but when evalstring() comes
+ * back here again, the "anything" will be validated.
+ * This means we can actually do:
+ * eval eval eval command eval eval command trap
+ * as long as we end up with just "trap"
+ *
+ * We permit "command" by allowing CMDBUILTIN as well as CMDSPLBLTIN
+ *
+ * trapcmd() takes care of doing free_traps() if it is needed there.
+ */
+ if (traps_invalid &&
+ ((cmdentry.cmdtype!=CMDSPLBLTIN && cmdentry.cmdtype!=CMDBUILTIN) ||
+ (cmdentry.u.bltin != trapcmd && cmdentry.u.bltin != evalcmd)))
+ free_traps();
+
+ /* Fork off a child process if necessary. */
+ if (cmd->ncmd.backgnd || (have_traps() && (flags & EV_EXIT) != 0)
+ || ((cmdentry.cmdtype == CMDNORMAL || cmdentry.cmdtype == CMDUNKNOWN)
+ && (flags & EV_EXIT) == 0)
+ || ((flags & EV_BACKCMD) != 0 &&
+ ((cmdentry.cmdtype != CMDBUILTIN && cmdentry.cmdtype != CMDSPLBLTIN)
+ || cmdentry.u.bltin == dotcmd
+ || cmdentry.u.bltin == evalcmd))) {
+ INTOFF;
+ jp = makejob(cmd, 1);
+ mode = cmd->ncmd.backgnd;
+ if (flags & EV_BACKCMD) {
+ mode = FORK_NOJOB;
+ if (sh_pipe(pip) < 0)
+ error("Pipe call failed");
+ }
+#ifdef DO_SHAREDVFORK
+ /* It is essential that if DO_SHAREDVFORK is defined that the
+ * child's address space is actually shared with the parent as
+ * we rely on this.
+ */
+ if (usefork == 0 && cmdentry.cmdtype == CMDNORMAL) {
+ pid_t pid;
+ int serrno;
+
+ savelocalvars = localvars;
+ localvars = NULL;
+ vforked = 1;
+ VFORK_BLOCK
+ switch (pid = vfork()) {
+ case -1:
+ serrno = errno;
+ VTRACE(DBG_EVAL, ("vfork() failed, errno=%d\n",
+ serrno));
+ INTON;
+ error("Cannot vfork (%s)", strerror(serrno));
+ break;
+ case 0:
+ /* Make sure that exceptions only unwind to
+ * after the vfork(2)
+ */
+ SHELL_FORKED();
+ if (setjmp(jmploc.loc)) {
+ if (exception == EXSHELLPROC) {
+ /*
+ * We can't progress with the
+ * vfork, so, set vforked = 2
+ * so the parent knows,
+ * and _exit();
+ */
+ vforked = 2;
+ _exit(0);
+ } else {
+ _exit(exception == EXEXIT ?
+ exitstatus : exerrno);
+ }
+ }
+ savehandler = handler;
+ handler = &jmploc;
+ listmklocal(varlist.list,
+ VDOEXPORT | VEXPORT | VNOFUNC);
+ forkchild(jp, cmd, mode, vforked);
+ break;
+ default:
+ VFORK_UNDO();
+ /* restore from vfork(2) */
+ handler = savehandler;
+ poplocalvars();
+ localvars = savelocalvars;
+ if (vforked == 2) {
+ vforked = 0;
+
+ (void)waitpid(pid, NULL, 0);
+ /*
+ * We need to progress in a
+ * normal fork fashion
+ */
+ goto normal_fork;
+ }
+ /*
+ * Here the child has left home,
+ * getting on with its life, so
+ * so must we...
+ */
+ vforked = 0;
+ forkparent(jp, cmd, mode, pid);
+ goto parent;
+ }
+ VFORK_END
+ } else {
+ normal_fork:
+#endif
+ if (forkshell(jp, cmd, mode) != 0)
+ goto parent; /* at end of routine */
+ flags |= EV_EXIT;
+ FORCEINTON;
+#ifdef DO_SHAREDVFORK
+ }
+#endif
+ if (flags & EV_BACKCMD) {
+ if (!vforked) {
+ FORCEINTON;
+ }
+ close(pip[0]);
+ movefd(pip[1], 1);
+ }
+ flags |= EV_EXIT;
+ }
+
+ /* This is the child process if a fork occurred. */
+ /* Execute the command. */
+ switch (cmdentry.cmdtype) {
+ volatile int saved;
+
+ case CMDFUNCTION:
+ VXTRACE(DBG_EVAL, ("Shell function%s: ",vforked?" VF":""),
+ trargs(argv));
+ redirect(cmd->ncmd.redirect, saved =
+ !(flags & EV_EXIT) || have_traps() ? REDIR_PUSH : 0);
+ saveparam = shellparam;
+ shellparam.malloc = 0;
+ shellparam.reset = 1;
+ shellparam.nparam = argc - 1;
+ shellparam.p = argv + 1;
+ shellparam.optnext = NULL;
+ INTOFF;
+ savelocalvars = localvars;
+ localvars = NULL;
+ reffunc(cmdentry.u.func);
+ INTON;
+ if (setjmp(jmploc.loc)) {
+ if (exception == EXSHELLPROC) {
+ freeparam((volatile struct shparam *)
+ &saveparam);
+ } else {
+ freeparam(&shellparam);
+ shellparam = saveparam;
+ }
+ if (saved)
+ popredir();;
+ unreffunc(cmdentry.u.func);
+ poplocalvars();
+ localvars = savelocalvars;
+ funclinebase = savefuncline;
+ funclineabs = savefuncabs;
+ handler = savehandler;
+ longjmp(handler->loc, 1);
+ }
+ savehandler = handler;
+ handler = &jmploc;
+ if (cmdentry.u.func) {
+ if (cmdentry.lno_frel)
+ funclinebase = cmdentry.lineno - 1;
+ else
+ funclinebase = 0;
+ funclineabs = cmdentry.lineno;
+
+ VTRACE(DBG_EVAL,
+ ("function: node: %d '%s' # %d%s; funclinebase=%d\n",
+ getfuncnode(cmdentry.u.func)->type,
+ NODETYPENAME(getfuncnode(cmdentry.u.func)->type),
+ cmdentry.lineno, cmdentry.lno_frel?" (=1)":"",
+ funclinebase));
+ }
+ listmklocal(varlist.list, VDOEXPORT | VEXPORT);
+ /* stop shell blowing its stack */
+ if (++funcnest > 1000)
+ error("too many nested function calls");
+ evaltree(getfuncnode(cmdentry.u.func),
+ flags & (EV_TESTED|EV_EXIT));
+ funcnest--;
+ INTOFF;
+ unreffunc(cmdentry.u.func);
+ poplocalvars();
+ localvars = savelocalvars;
+ funclinebase = savefuncline;
+ funclineabs = savefuncabs;
+ freeparam(&shellparam);
+ shellparam = saveparam;
+ handler = savehandler;
+ if (saved)
+ popredir();
+ INTON;
+ if (evalskip == SKIPFUNC) {
+ evalskip = SKIPNONE;
+ skipcount = 0;
+ }
+ if (flags & EV_EXIT)
+ exitshell(exitstatus);
+ break;
+
+ case CMDSPLBLTIN:
+ VTRACE(DBG_EVAL, ("special "));
+ case CMDBUILTIN:
+ VXTRACE(DBG_EVAL, ("builtin command [%d]%s: ", argc,
+ vforked ? " VF" : ""), trargs(argv));
+ mode = (cmdentry.u.bltin == execcmd) ? 0 : REDIR_PUSH;
+ if (flags == EV_BACKCMD) {
+ memout.nleft = 0;
+ memout.nextc = memout.buf;
+ memout.bufsize = 64;
+ mode |= REDIR_BACKQ;
+ }
+ e = -1;
+ savecmdname = commandname;
+ savetopfile = getcurrentfile();
+ savehandler = handler;
+ temp_path = 0;
+ if (!setjmp(jmploc.loc)) {
+ handler = &jmploc;
+
+ /*
+ * We need to ensure the command hash table isn't
+ * corrupted by temporary PATH assignments.
+ * However we must ensure the 'local' command works!
+ */
+ if (path != pathval() && (cmdentry.u.bltin == hashcmd ||
+ cmdentry.u.bltin == typecmd)) {
+ savelocalvars = localvars;
+ localvars = 0;
+ temp_path = 1;
+ mklocal(path - 5 /* PATH= */, 0);
+ }
+ redirect(cmd->ncmd.redirect, mode);
+
+ /*
+ * the empty command is regarded as a normal
+ * builtin for the purposes of redirects, but
+ * is a special builtin for var assigns.
+ * (unless we are the "command" command.)
+ */
+ if (argc == 0 && !(cmd_flags & DO_NOFUNC))
+ cmdentry.cmdtype = CMDSPLBLTIN;
+
+ /* exec is a special builtin, but needs this list... */
+ cmdenviron = varlist.list;
+ /* we must check 'readonly' flag for all builtins */
+ listsetvar(varlist.list,
+ cmdentry.cmdtype == CMDSPLBLTIN ? 0 : VNOSET);
+ commandname = argv[0];
+ /* initialize nextopt */
+ argptr = argv + 1;
+ optptr = NULL;
+ /* and getopt */
+ optreset = 1;
+ optind = 1;
+ builtin_flags = flags;
+ exitstatus = cmdentry.u.bltin(argc, argv);
+ } else {
+ e = exception;
+ if (e == EXINT)
+ exitstatus = SIGINT + 128;
+ else if (e == EXEXEC)
+ exitstatus = exerrno;
+ else if (e != EXEXIT)
+ exitstatus = 2;
+ }
+ handler = savehandler;
+ flushall();
+ out1 = &output;
+ out2 = &errout;
+ freestdout();
+ if (temp_path) {
+ poplocalvars();
+ localvars = savelocalvars;
+ }
+ cmdenviron = NULL;
+ if (e != EXSHELLPROC) {
+ commandname = savecmdname;
+ if (flags & EV_EXIT)
+ exitshell(exitstatus);
+ }
+ if (e != -1) {
+ if ((e != EXERROR && e != EXEXEC)
+ || cmdentry.cmdtype == CMDSPLBLTIN)
+ exraise(e);
+ popfilesupto(savetopfile);
+ FORCEINTON;
+ }
+ if (cmdentry.u.bltin != execcmd)
+ popredir();
+ if (flags == EV_BACKCMD) {
+ backcmd->buf = memout.buf;
+ backcmd->nleft = memout.nextc - memout.buf;
+ memout.buf = NULL;
+ }
+ break;
+
+ default:
+ VXTRACE(DBG_EVAL, ("normal command%s: ", vforked?" VF":""),
+ trargs(argv));
+ redirect(cmd->ncmd.redirect,
+ (vforked ? REDIR_VFORK : 0) | REDIR_KEEP);
+ if (!vforked)
+ for (sp = varlist.list ; sp ; sp = sp->next)
+ setvareq(sp->text, VDOEXPORT|VEXPORT|VSTACK);
+ envp = environment();
+ shellexec(argv, envp, path, cmdentry.u.index, vforked);
+ break;
+ }
+ goto out;
+
+ parent: /* parent process gets here (if we forked) */
+
+ exitstatus = 0; /* if not altered just below */
+ if (mode == FORK_FG) { /* argument to fork */
+ exitstatus = waitforjob(jp);
+ } else if (mode == FORK_NOJOB) {
+ backcmd->fd = pip[0];
+ close(pip[1]);
+ backcmd->jp = jp;
+ }
+ FORCEINTON;
+
+ out:
+ if (lastarg)
+ /* implement $_ for whatever use that really is */
+ (void) setvarsafe("_", lastarg, VNOERROR);
+ popstackmark(&smark);
+}
+
+
+/*
+ * Search for a command. This is called before we fork so that the
+ * location of the command will be available in the parent as well as
+ * the child. The check for "goodname" is an overly conservative
+ * check that the name will not be subject to expansion.
+ */
+
+STATIC void
+prehash(union node *n)
+{
+ struct cmdentry entry;
+
+ if (n && n->type == NCMD && n->ncmd.args)
+ if (goodname(n->ncmd.args->narg.text))
+ find_command(n->ncmd.args->narg.text, &entry, 0,
+ pathval());
+}
+
+int
+in_function(void)
+{
+ return funcnest;
+}
+
+enum skipstate
+current_skipstate(void)
+{
+ return evalskip;
+}
+
+void
+save_skipstate(struct skipsave *p)
+{
+ *p = s_k_i_p;
+}
+
+void
+restore_skipstate(const struct skipsave *p)
+{
+ s_k_i_p = *p;
+}
+
+void
+stop_skipping(void)
+{
+ evalskip = SKIPNONE;
+ skipcount = 0;
+}
+
+/*
+ * Builtin commands. Builtin commands whose functions are closely
+ * tied to evaluation are implemented here.
+ */
+
+/*
+ * No command given.
+ */
+
+int
+bltincmd(int argc, char **argv)
+{
+ /*
+ * Preserve exitstatus of a previous possible redirection
+ * as POSIX mandates
+ */
+ return back_exitstatus;
+}
+
+
+/*
+ * Handle break and continue commands. Break, continue, and return are
+ * all handled by setting the evalskip flag. The evaluation routines
+ * above all check this flag, and if it is set they start skipping
+ * commands rather than executing them. The variable skipcount is
+ * the number of loops to break/continue, or the number of function
+ * levels to return. (The latter is always 1.) It should probably
+ * be an error to break out of more loops than exist, but it isn't
+ * in the standard shell so we don't make it one here.
+ */
+
+int
+breakcmd(int argc, char **argv)
+{
+ int n = argc > 1 ? number(argv[1]) : 1;
+
+ if (n <= 0)
+ error("invalid count: %d", n);
+ if (n > loopnest)
+ n = loopnest;
+ if (n > 0) {
+ evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
+ skipcount = n;
+ }
+ return 0;
+}
+
+int
+dotcmd(int argc, char **argv)
+{
+ exitstatus = 0;
+
+ if (argc >= 2) { /* That's what SVR2 does */
+ char *fullname;
+ /*
+ * dot_funcnest needs to be 0 when not in a dotcmd, so it
+ * cannot be restored with (funcnest + 1).
+ */
+ int dot_funcnest_old;
+ struct stackmark smark;
+
+ setstackmark(&smark);
+ fullname = find_dot_file(argv[1]);
+ setinputfile(fullname, 1);
+ commandname = fullname;
+ dot_funcnest_old = dot_funcnest;
+ dot_funcnest = funcnest + 1;
+ cmdloop(0);
+ dot_funcnest = dot_funcnest_old;
+ popfile();
+ popstackmark(&smark);
+ }
+ return exitstatus;
+}
+
+/*
+ * Take commands from a file. To be compatible we should do a path
+ * search for the file, which is necessary to find sub-commands.
+ */
+
+STATIC char *
+find_dot_file(char *basename)
+{
+ char *fullname;
+ const char *path = pathval();
+ struct stat statb;
+
+ /* don't try this for absolute or relative paths */
+ if (strchr(basename, '/')) {
+ if (stat(basename, &statb) == 0) {
+ if (S_ISDIR(statb.st_mode))
+ error("%s: is a directory", basename);
+ if (S_ISBLK(statb.st_mode))
+ error("%s: is a block device", basename);
+ return basename;
+ }
+ } else while ((fullname = padvance(&path, basename, 1)) != NULL) {
+ if ((stat(fullname, &statb) == 0)) {
+ /* weird format is to ease future code... */
+ if (S_ISDIR(statb.st_mode) || S_ISBLK(statb.st_mode))
+ ;
+#if notyet
+ else if (unreadable()) {
+ /*
+ * testing this via st_mode is ugly to get
+ * correct (and would ignore ACLs).
+ * better way is just to open the file.
+ * But doing that here would (currently)
+ * mean opening the file twice, which
+ * might not be safe. So, defer this
+ * test until code is restructures so
+ * we can return a fd. Then we also
+ * get to fix the mem leak just below...
+ */
+ }
+#endif
+ else {
+ /*
+ * Don't bother freeing here, since
+ * it will be freed by the caller.
+ * XXX no it won't - a bug for later.
+ */
+ return fullname;
+ }
+ }
+ stunalloc(fullname);
+ }
+
+ /* not found in the PATH */
+ error("%s: not found", basename);
+ /* NOTREACHED */
+}
+
+
+
+/*
+ * The return command.
+ *
+ * Quoth the POSIX standard:
+ * The return utility shall cause the shell to stop executing the current
+ * function or dot script. If the shell is not currently executing
+ * a function or dot script, the results are unspecified.
+ *
+ * As for the unspecified part, there seems to be no de-facto standard: bash
+ * ignores the return with a warning, zsh ignores the return in interactive
+ * mode but seems to liken it to exit in a script. (checked May 2014)
+ *
+ * We choose to silently ignore the return. Older versions of this shell
+ * set evalskip to SKIPFILE causing the shell to (indirectly) exit. This
+ * had at least the problem of circumventing the check for stopped jobs,
+ * which would occur for exit or ^D.
+ */
+
+int
+returncmd(int argc, char **argv)
+{
+ int ret = argc > 1 ? number(argv[1]) : exitstatus;
+
+ if ((dot_funcnest == 0 && funcnest)
+ || (dot_funcnest > 0 && funcnest - (dot_funcnest - 1) > 0)) {
+ evalskip = SKIPFUNC;
+ skipcount = 1;
+ } else if (dot_funcnest > 0) {
+ evalskip = SKIPFILE;
+ skipcount = 1;
+ } else {
+ /* XXX: should a warning be issued? */
+ ret = 0;
+ }
+
+ return ret;
+}
+
+
+int
+falsecmd(int argc, char **argv)
+{
+ return 1;
+}
+
+
+int
+truecmd(int argc, char **argv)
+{
+ return 0;
+}
+
+
+int
+execcmd(int argc, char **argv)
+{
+ if (argc > 1) {
+ struct strlist *sp;
+
+ iflag = 0; /* exit on error */
+ mflag = 0;
+ optschanged();
+ for (sp = cmdenviron; sp; sp = sp->next)
+ setvareq(sp->text, VDOEXPORT|VEXPORT|VSTACK);
+ shellexec(argv + 1, environment(), pathval(), 0, 0);
+ }
+ return 0;
+}
+
+static int
+conv_time(clock_t ticks, char *seconds, size_t l)
+{
+ static clock_t tpm = 0;
+ clock_t mins;
+ int i;
+
+ if (!tpm)
+ tpm = sysconf(_SC_CLK_TCK) * 60;
+
+ mins = ticks / tpm;
+ snprintf(seconds, l, "%.4f", (ticks - mins * tpm) * 60.0 / tpm );
+
+ if (seconds[0] == '6' && seconds[1] == '0') {
+ /* 59.99995 got rounded up... */
+ mins++;
+ strlcpy(seconds, "0.0", l);
+ return mins;
+ }
+
+ /* suppress trailing zeros */
+ i = strlen(seconds) - 1;
+ for (; seconds[i] == '0' && seconds[i - 1] != '.'; i--)
+ seconds[i] = 0;
+ return mins;
+}
+
+int
+timescmd(int argc, char **argv)
+{
+ struct tms tms;
+ int u, s, cu, cs;
+ char us[8], ss[8], cus[8], css[8];
+
+ nextopt("");
+
+ times(&tms);
+
+ u = conv_time(tms.tms_utime, us, sizeof(us));
+ s = conv_time(tms.tms_stime, ss, sizeof(ss));
+ cu = conv_time(tms.tms_cutime, cus, sizeof(cus));
+ cs = conv_time(tms.tms_cstime, css, sizeof(css));
+
+ outfmt(out1, "%dm%ss %dm%ss\n%dm%ss %dm%ss\n",
+ u, us, s, ss, cu, cus, cs, css);
+
+ return 0;
+}
generated by cgit v1.2.3-60-g2f50 (git 2.42.0) at 2024-06-28 21:58:36 +0000