diff options
Diffstat (limited to 'release/picobsd/tinyware/ash/eval.c')
-rw-r--r-- | release/picobsd/tinyware/ash/eval.c | 1012 |
1 files changed, 0 insertions, 1012 deletions
diff --git a/release/picobsd/tinyware/ash/eval.c b/release/picobsd/tinyware/ash/eval.c deleted file mode 100644 index 8f69649..0000000 --- a/release/picobsd/tinyware/ash/eval.c +++ /dev/null @@ -1,1012 +0,0 @@ -/* $NetBSD: eval.c,v 1.36 1997/07/04 21:01:56 christos 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. 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. - */ - -#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 1.36 1997/07/04 21:01:56 christos Exp $"); -#endif -#endif /* not lint */ - -#include <signal.h> -#include <unistd.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" -#ifndef SMALL -#include "myhistedit.h" -#endif - - -/* flags in argument to evaltree */ -#define EV_EXIT 01 /* exit after evaluating tree */ -#define EV_TESTED 02 /* exit status is checked; ignore -e flag */ -#define EV_BACKCMD 04 /* command executing within back quotes */ - -MKINIT int evalskip; /* set if we are skipping commands */ -STATIC int skipcount; /* number of levels to skip */ -MKINIT int loopnest; /* current loop nesting level */ -int funcnest; /* depth of function calls */ - - -char *commandname; -struct strlist *cmdenviron; -int exitstatus; /* exit status of last command */ -int oexitstatus; /* saved exit status */ - - -STATIC void evalloop __P((union node *)); -STATIC void evalfor __P((union node *)); -STATIC void evalcase __P((union node *, int)); -STATIC void evalsubshell __P((union node *, int)); -STATIC void expredir __P((union node *)); -STATIC void evalpipe __P((union node *)); -STATIC void evalcommand __P((union node *, int, struct backcmd *)); -STATIC void prehash __P((union node *)); - - -/* - * Called to reset things after an exception. - */ - -#ifdef mkinit -INCLUDE "eval.h" - -RESET { - evalskip = 0; - loopnest = 0; - funcnest = 0; -} - -SHELLPROC { - exitstatus = 0; -} -#endif - - - -/* - * The eval commmand. - */ - -int -evalcmd(argc, argv) - 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); - } - return exitstatus; -} - - -/* - * Execute a command or commands contained in a string. - */ - -void -evalstring(s) - char *s; - { - union node *n; - struct stackmark smark; - - setstackmark(&smark); - setinputstring(s, 1); - while ((n = parsecmd(0)) != NEOF) { - evaltree(n, 0); - popstackmark(&smark); - } - popfile(); - popstackmark(&smark); -} - - - -/* - * Evaluate a parse tree. The value is left in the global variable - * exitstatus. - */ - -void -evaltree(n, flags) - union node *n; - int flags; -{ - if (n == NULL) { - TRACE(("evaltree(NULL) called\n")); - exitstatus = 0; - goto out; - } -#ifndef SMALL - displayhist = 1; /* show history substitutions done with fc */ -#endif - TRACE(("evaltree(0x%lx: %d) called\n", (long)n, n->type)); - switch (n->type) { - case NSEMI: - evaltree(n->nbinary.ch1, 0); - if (evalskip) - goto out; - evaltree(n->nbinary.ch2, flags); - break; - case NAND: - evaltree(n->nbinary.ch1, EV_TESTED); - if (evalskip || exitstatus != 0) { - /* don't bomb out on "set -e; false && true" */ - flags |= EV_TESTED; - goto out; - } - evaltree(n->nbinary.ch2, flags); - break; - case NOR: - evaltree(n->nbinary.ch1, EV_TESTED); - if (evalskip || exitstatus == 0) - goto out; - evaltree(n->nbinary.ch2, flags); - break; - case NREDIR: - expredir(n->nredir.redirect); - redirect(n->nredir.redirect, REDIR_PUSH); - evaltree(n->nredir.n, flags); - popredir(); - break; - case NSUBSHELL: - evalsubshell(n, flags); - break; - case NBACKGND: - evalsubshell(n, flags); - break; - case NIF: { - evaltree(n->nif.test, EV_TESTED); - if (evalskip) - goto out; - if (exitstatus == 0) - evaltree(n->nif.ifpart, flags); - else if (n->nif.elsepart) - evaltree(n->nif.elsepart, flags); - else - exitstatus = 0; - break; - } - case NWHILE: - case NUNTIL: - evalloop(n); - break; - case NFOR: - evalfor(n); - break; - case NCASE: - evalcase(n, flags); - break; - case NDEFUN: - defun(n->narg.text, n->narg.next); - exitstatus = 0; - break; - case NNOT: - evaltree(n->nnot.com, EV_TESTED); - exitstatus = !exitstatus; - break; - - case NPIPE: - evalpipe(n); - break; - case NCMD: - evalcommand(n, flags, (struct backcmd *)NULL); - break; - default: - out1fmt("Node type = %d\n", n->type); - flushout(&output); - break; - } -out: - if (pendingsigs) - dotrap(); - if ((flags & EV_EXIT) || (eflag && exitstatus && !(flags & EV_TESTED))) - exitshell(exitstatus); -} - - -STATIC void -evalloop(n) - union node *n; -{ - int status; - - loopnest++; - status = 0; - for (;;) { - evaltree(n->nbinary.ch1, EV_TESTED); - if (evalskip) { -skipping: if (evalskip == SKIPCONT && --skipcount <= 0) { - evalskip = 0; - continue; - } - if (evalskip == SKIPBREAK && --skipcount <= 0) - evalskip = 0; - break; - } - if (n->type == NWHILE) { - if (exitstatus != 0) - break; - } else { - if (exitstatus == 0) - break; - } - evaltree(n->nbinary.ch2, 0); - status = exitstatus; - if (evalskip) - goto skipping; - } - loopnest--; - exitstatus = status; -} - - - -STATIC void -evalfor(n) - union node *n; -{ - struct arglist arglist; - union node *argp; - struct strlist *sp; - struct stackmark smark; - - setstackmark(&smark); - arglist.lastp = &arglist.list; - for (argp = n->nfor.args ; argp ; argp = argp->narg.next) { - oexitstatus = exitstatus; - expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); - if (evalskip) - goto out; - } - *arglist.lastp = NULL; - - exitstatus = 0; - loopnest++; - for (sp = arglist.list ; sp ; sp = sp->next) { - setvar(n->nfor.var, sp->text, 0); - evaltree(n->nfor.body, 0); - if (evalskip) { - if (evalskip == SKIPCONT && --skipcount <= 0) { - evalskip = 0; - continue; - } - if (evalskip == SKIPBREAK && --skipcount <= 0) - evalskip = 0; - break; - } - } - loopnest--; -out: - popstackmark(&smark); -} - - - -STATIC void -evalcase(n, flags) - union node *n; - int flags; -{ - union node *cp; - union node *patp; - struct arglist arglist; - struct stackmark smark; - - setstackmark(&smark); - arglist.lastp = &arglist.list; - oexitstatus = exitstatus; - 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) { - if (casematch(patp, arglist.list->text)) { - if (evalskip == 0) { - evaltree(cp->nclist.body, flags); - } - goto out; - } - } - } -out: - popstackmark(&smark); -} - - - -/* - * Kick off a subshell to evaluate a tree. - */ - -STATIC void -evalsubshell(n, flags) - union node *n; - int flags; -{ - struct job *jp; - int backgnd = (n->type == NBACKGND); - - expredir(n->nredir.redirect); - jp = makejob(n, 1); - if (forkshell(jp, n, backgnd) == 0) { - if (backgnd) - flags &=~ EV_TESTED; - redirect(n->nredir.redirect, 0); - evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */ - } - if (! backgnd) { - INTOFF; - exitstatus = waitforjob(jp); - INTON; - } -} - - - -/* - * Compute the names of the files in a redirection list. - */ - -STATIC void -expredir(n) - union node *n; -{ - union node *redir; - - for (redir = n ; redir ; redir = redir->nfile.next) { - struct arglist fn; - fn.lastp = &fn.list; - oexitstatus = exitstatus; - switch (redir->type) { - case NFROM: - case NTO: - 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_FULL | EXP_TILDE); - fixredir(redir, fn.list->text, 1); - } - break; - } - } -} - - - -/* - * 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(n) - union node *n; -{ - struct job *jp; - struct nodelist *lp; - int pipelen; - int prevfd; - int pip[2]; - - TRACE(("evalpipe(0x%lx) called\n", (long)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 (pipe(pip) < 0) { - close(prevfd); - error("Pipe call failed"); - } - } - if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) { - INTON; - if (prevfd > 0) { - close(0); - copyfd(prevfd, 0); - close(prevfd); - } - if (pip[1] >= 0) { - close(pip[0]); - if (pip[1] != 1) { - close(1); - copyfd(pip[1], 1); - close(pip[1]); - } - } - evaltree(lp->n, EV_EXIT); - } - if (prevfd >= 0) - close(prevfd); - prevfd = pip[0]; - close(pip[1]); - } - INTON; - if (n->npipe.backgnd == 0) { - INTOFF; - exitstatus = waitforjob(jp); - TRACE(("evalpipe: job done exit status %d\n", exitstatus)); - 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(n, result) - union node *n; - struct backcmd *result; -{ - int pip[2]; - struct job *jp; - struct stackmark smark; /* unnecessary */ - - setstackmark(&smark); - result->fd = -1; - result->buf = NULL; - result->nleft = 0; - result->jp = NULL; - if (n == NULL) { - exitstatus = 0; - goto out; - } - if (n->type == NCMD) { - exitstatus = oexitstatus; - evalcommand(n, EV_BACKCMD, result); - } else { - exitstatus = 0; - if (pipe(pip) < 0) - error("Pipe call failed"); - jp = makejob(n, 1); - if (forkshell(jp, n, FORK_NOJOB) == 0) { - FORCEINTON; - close(pip[0]); - if (pip[1] != 1) { - close(1); - copyfd(pip[1], 1); - close(pip[1]); - } - evaltree(n, EV_EXIT); - } - close(pip[1]); - result->fd = pip[0]; - result->jp = jp; - } -out: - popstackmark(&smark); - TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n", - result->fd, result->buf, result->nleft, result->jp)); -} - - - -/* - * Execute a simple command. - */ - -STATIC void -evalcommand(cmd, flags, backcmd) - union node *cmd; - int flags; - struct backcmd *backcmd; -{ - struct stackmark smark; - union node *argp; - struct arglist arglist; - struct arglist varlist; - char **argv; - int argc; - char **envp; - int varflag; - struct strlist *sp; - int mode; - int pip[2]; - struct cmdentry cmdentry; - struct job *jp; - struct jmploc jmploc; - struct jmploc *volatile savehandler; - char *volatile savecmdname; - volatile struct shparam saveparam; - struct localvar *volatile savelocalvars; - volatile int e; - char *lastarg; -#if __GNUC__ - /* Avoid longjmp clobbering */ - (void) &argv; - (void) &argc; - (void) &lastarg; - (void) &flags; -#endif - - /* First expand the arguments. */ - TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags)); - setstackmark(&smark); - arglist.lastp = &arglist.list; - varlist.lastp = &varlist.list; - varflag = 1; - oexitstatus = exitstatus; - exitstatus = 0; - for (argp = cmd->ncmd.args ; argp ; argp = argp->narg.next) { - char *p = argp->narg.text; - if (varflag && is_name(*p)) { - do { - p++; - } while (is_in_name(*p)); - if (*p == '=') { - expandarg(argp, &varlist, EXP_VARTILDE); - continue; - } - } - expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); - varflag = 0; - } - *arglist.lastp = NULL; - *varlist.lastp = NULL; - expredir(cmd->ncmd.redirect); - 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) { - TRACE(("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) { - outc('+', &errout); - for (sp = varlist.list ; sp ; sp = sp->next) { - outc(' ', &errout); - out2str(sp->text); - } - for (sp = arglist.list ; sp ; sp = sp->next) { - outc(' ', &errout); - out2str(sp->text); - } - outc('\n', &errout); - flushout(&errout); - } - - /* Now locate the command. */ - if (argc == 0) { - cmdentry.cmdtype = CMDBUILTIN; - cmdentry.u.index = BLTINCMD; - } else { - static const char PATH[] = "PATH="; - char *path = pathval(); - - /* - * 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; - - find_command(argv[0], &cmdentry, 1, path); - if (cmdentry.cmdtype == CMDUNKNOWN) { /* command not found */ - exitstatus = 127; - flushout(&errout); - return; - } - /* implement the bltin builtin here */ - if (cmdentry.cmdtype == CMDBUILTIN && cmdentry.u.index == BLTINCMD) { - for (;;) { - argv++; - if (--argc == 0) - break; - if ((cmdentry.u.index = find_builtin(*argv)) < 0) { - outfmt(&errout, "%s: not found\n", *argv); - exitstatus = 127; - flushout(&errout); - return; - } - if (cmdentry.u.index != BLTINCMD) - break; - } - } - } - - /* Fork off a child process if necessary. */ - if (cmd->ncmd.backgnd - || (cmdentry.cmdtype == CMDNORMAL && (flags & EV_EXIT) == 0) - || ((flags & EV_BACKCMD) != 0 - && (cmdentry.cmdtype != CMDBUILTIN - || cmdentry.u.index == DOTCMD - || cmdentry.u.index == EVALCMD))) { - jp = makejob(cmd, 1); - mode = cmd->ncmd.backgnd; - if (flags & EV_BACKCMD) { - mode = FORK_NOJOB; - if (pipe(pip) < 0) - error("Pipe call failed"); - } - if (forkshell(jp, cmd, mode) != 0) - goto parent; /* at end of routine */ - if (flags & EV_BACKCMD) { - FORCEINTON; - close(pip[0]); - if (pip[1] != 1) { - close(1); - copyfd(pip[1], 1); - close(pip[1]); - } - } - flags |= EV_EXIT; - } - - /* This is the child process if a fork occurred. */ - /* Execute the command. */ - if (cmdentry.cmdtype == CMDFUNCTION) { -#ifdef DEBUG - trputs("Shell function: "); trargs(argv); -#endif - redirect(cmd->ncmd.redirect, REDIR_PUSH); - saveparam = shellparam; - shellparam.malloc = 0; - shellparam.reset = 1; - shellparam.nparam = argc - 1; - shellparam.p = argv + 1; - shellparam.optnext = NULL; - INTOFF; - savelocalvars = localvars; - localvars = NULL; - INTON; - if (setjmp(jmploc.loc)) { - if (exception == EXSHELLPROC) - freeparam((struct shparam *)&saveparam); - else { - freeparam(&shellparam); - shellparam = saveparam; - } - poplocalvars(); - localvars = savelocalvars; - handler = savehandler; - longjmp(handler->loc, 1); - } - savehandler = handler; - handler = &jmploc; - for (sp = varlist.list ; sp ; sp = sp->next) - mklocal(sp->text); - funcnest++; - evaltree(cmdentry.u.func, 0); - funcnest--; - INTOFF; - poplocalvars(); - localvars = savelocalvars; - freeparam(&shellparam); - shellparam = saveparam; - handler = savehandler; - popredir(); - INTON; - if (evalskip == SKIPFUNC) { - evalskip = 0; - skipcount = 0; - } - if (flags & EV_EXIT) - exitshell(exitstatus); - } else if (cmdentry.cmdtype == CMDBUILTIN) { -#ifdef DEBUG - trputs("builtin command: "); trargs(argv); -#endif - mode = (cmdentry.u.index == EXECCMD)? 0 : REDIR_PUSH; - if (flags == EV_BACKCMD) { - memout.nleft = 0; - memout.nextc = memout.buf; - memout.bufsize = 64; - mode |= REDIR_BACKQ; - } - redirect(cmd->ncmd.redirect, mode); - savecmdname = commandname; - cmdenviron = varlist.list; - e = -1; - if (setjmp(jmploc.loc)) { - e = exception; - exitstatus = (e == EXINT)? SIGINT+128 : 2; - goto cmddone; - } - savehandler = handler; - handler = &jmploc; - commandname = argv[0]; - argptr = argv + 1; - optptr = NULL; /* initialize nextopt */ - exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv); - flushall(); -cmddone: - out1 = &output; - out2 = &errout; - freestdout(); - if (e != EXSHELLPROC) { - commandname = savecmdname; - if (flags & EV_EXIT) { - exitshell(exitstatus); - } - } - handler = savehandler; - if (e != -1) { - if ((e != EXERROR && e != EXEXEC) - || cmdentry.u.index == BLTINCMD - || cmdentry.u.index == DOTCMD - || cmdentry.u.index == EVALCMD -#ifndef SMALL - || cmdentry.u.index == HISTCMD -#endif - || cmdentry.u.index == EXECCMD) - exraise(e); - FORCEINTON; - } - if (cmdentry.u.index != EXECCMD) - popredir(); - if (flags == EV_BACKCMD) { - backcmd->buf = memout.buf; - backcmd->nleft = memout.nextc - memout.buf; - memout.buf = NULL; - } - } else { -#ifdef DEBUG - trputs("normal command: "); trargs(argv); -#endif - clearredir(); - redirect(cmd->ncmd.redirect, 0); - for (sp = varlist.list ; sp ; sp = sp->next) - setvareq(sp->text, VEXPORT|VSTACK); - envp = environment(); - shellexec(argv, envp, pathval(), cmdentry.u.index); - /*NOTREACHED*/ - } - goto out; - -parent: /* parent process gets here (if we forked) */ - if (mode == 0) { /* argument to fork */ - INTOFF; - exitstatus = waitforjob(jp); - INTON; - } else if (mode == 2) { - backcmd->fd = pip[0]; - close(pip[1]); - backcmd->jp = jp; - } - -out: - if (lastarg) - setvar("_", lastarg, 0); - 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(n) - union node *n; -{ - struct cmdentry entry; - - if (n->type == NCMD && n->ncmd.args) - if (goodname(n->ncmd.args->narg.text)) - find_command(n->ncmd.args->narg.text, &entry, 0, - pathval()); -} - - - -/* - * Builtin commands. Builtin commands whose functions are closely - * tied to evaluation are implemented here. - */ - -/* - * No command given, or a bltin command with no arguments. Set the - * specified variables. - */ - -int -bltincmd(argc, argv) - int argc; - char **argv; -{ - listsetvar(cmdenviron); - /* - * Preserve exitstatus of a previous possible redirection - * as POSIX mandates - */ - return 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(argc, argv) - int argc; - char **argv; -{ - int n = argc > 1 ? number(argv[1]) : 1; - - if (n > loopnest) - n = loopnest; - if (n > 0) { - evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK; - skipcount = n; - } - return 0; -} - - -/* - * The return command. - */ - -int -returncmd(argc, argv) - int argc; - char **argv; -{ - int ret = argc > 1 ? number(argv[1]) : oexitstatus; - - if (funcnest) { - evalskip = SKIPFUNC; - skipcount = 1; - return ret; - } - else { - /* Do what ksh does; skip the rest of the file */ - evalskip = SKIPFILE; - skipcount = 1; - return ret; - } -} - - -int -falsecmd(argc, argv) - int argc; - char **argv; -{ - return 1; -} - - -int -truecmd(argc, argv) - int argc; - char **argv; -{ - return 0; -} - - -int -execcmd(argc, argv) - 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, VEXPORT|VSTACK); - shellexec(argv + 1, environment(), pathval(), 0); - - } - return 0; -} |