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c_ksh.c
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c_ksh.c
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/* $OpenBSD: c_ksh.c,v 1.62 2019/06/28 13:34:59 deraadt Exp $ */
/*
* built-in Korn commands: c_*
*/
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "sh.h"
int
c_cd(char **wp)
{
int optc;
int physical = Flag(FPHYSICAL);
int cdnode; /* was a node from cdpath added in? */
int printpath = 0; /* print where we cd'd? */
int rval;
struct tbl *pwd_s, *oldpwd_s;
XString xs;
char *xp;
char *dir, *try, *pwd;
int phys_path;
char *cdpath;
char *fdir = NULL;
while ((optc = ksh_getopt(wp, &builtin_opt, "LP")) != -1)
switch (optc) {
case 'L':
physical = 0;
break;
case 'P':
physical = 1;
break;
case '?':
return 1;
}
wp += builtin_opt.optind;
if (Flag(FRESTRICTED)) {
bi_errorf("restricted shell - can't cd");
return 1;
}
pwd_s = global("PWD");
oldpwd_s = global("OLDPWD");
if (!wp[0]) {
/* No arguments - go home */
if ((dir = str_val(global("HOME"))) == null) {
bi_errorf("no home directory (HOME not set)");
return 1;
}
} else if (!wp[1]) {
/* One argument: - or dir */
dir = wp[0];
if (strcmp(dir, "-") == 0) {
dir = str_val(oldpwd_s);
if (dir == null) {
bi_errorf("no OLDPWD");
return 1;
}
printpath++;
}
} else if (!wp[2]) {
/* Two arguments - substitute arg1 in PWD for arg2 */
int ilen, olen, nlen, elen;
char *cp;
if (!current_wd[0]) {
bi_errorf("don't know current directory");
return 1;
}
/* substitute arg1 for arg2 in current path.
* if the first substitution fails because the cd fails
* we could try to find another substitution. For now
* we don't
*/
if ((cp = strstr(current_wd, wp[0])) == NULL) {
bi_errorf("bad substitution");
return 1;
}
ilen = cp - current_wd;
olen = strlen(wp[0]);
nlen = strlen(wp[1]);
elen = strlen(current_wd + ilen + olen) + 1;
fdir = dir = alloc(ilen + nlen + elen, ATEMP);
memcpy(dir, current_wd, ilen);
memcpy(dir + ilen, wp[1], nlen);
memcpy(dir + ilen + nlen, current_wd + ilen + olen, elen);
printpath++;
} else {
bi_errorf("too many arguments");
return 1;
}
Xinit(xs, xp, PATH_MAX, ATEMP);
/* xp will have a bogus value after make_path() - set it to 0
* so that if it's used, it will cause a dump
*/
xp = NULL;
cdpath = str_val(global("CDPATH"));
do {
cdnode = make_path(current_wd, dir, &cdpath, &xs, &phys_path);
if (physical)
rval = chdir(try = Xstring(xs, xp) + phys_path);
else {
simplify_path(Xstring(xs, xp));
rval = chdir(try = Xstring(xs, xp));
}
} while (rval == -1 && cdpath != NULL);
if (rval == -1) {
if (cdnode)
bi_errorf("%s: bad directory", dir);
else
bi_errorf("%s - %s", try, strerror(errno));
afree(fdir, ATEMP);
return 1;
}
/* Clear out tracked aliases with relative paths */
flushcom(0);
/* Set OLDPWD (note: unsetting OLDPWD does not disable this
* setting in at&t ksh)
*/
if (current_wd[0])
/* Ignore failure (happens if readonly or integer) */
setstr(oldpwd_s, current_wd, KSH_RETURN_ERROR);
if (Xstring(xs, xp)[0] != '/') {
pwd = NULL;
} else
if (!physical || !(pwd = get_phys_path(Xstring(xs, xp))))
pwd = Xstring(xs, xp);
/* Set PWD */
if (pwd) {
char *ptmp = pwd;
set_current_wd(ptmp);
/* Ignore failure (happens if readonly or integer) */
setstr(pwd_s, ptmp, KSH_RETURN_ERROR);
} else {
set_current_wd(null);
pwd = Xstring(xs, xp);
/* XXX unset $PWD? */
}
if (printpath || cdnode)
shprintf("%s\n", pwd);
afree(fdir, ATEMP);
return 0;
}
int
c_pwd(char **wp)
{
int optc;
int physical = Flag(FPHYSICAL);
char *p, *freep = NULL;
while ((optc = ksh_getopt(wp, &builtin_opt, "LP")) != -1)
switch (optc) {
case 'L':
physical = 0;
break;
case 'P':
physical = 1;
break;
case '?':
return 1;
}
wp += builtin_opt.optind;
if (wp[0]) {
bi_errorf("too many arguments");
return 1;
}
p = current_wd[0] ? (physical ? get_phys_path(current_wd) : current_wd) :
NULL;
if (p && access(p, R_OK) == -1)
p = NULL;
if (!p) {
freep = p = ksh_get_wd(NULL, 0);
if (!p) {
bi_errorf("can't get current directory - %s",
strerror(errno));
return 1;
}
}
shprintf("%s\n", p);
afree(freep, ATEMP);
return 0;
}
int
c_print(char **wp)
{
#define PO_NL BIT(0) /* print newline */
#define PO_EXPAND BIT(1) /* expand backslash sequences */
#define PO_PMINUSMINUS BIT(2) /* print a -- argument */
#define PO_HIST BIT(3) /* print to history instead of stdout */
#define PO_COPROC BIT(4) /* printing to coprocess: block SIGPIPE */
int fd = 1;
int flags = PO_EXPAND|PO_NL;
char *s;
const char *emsg;
XString xs;
char *xp;
if (wp[0][0] == 'e') { /* echo command */
int nflags = flags;
/* A compromise between sysV and BSD echo commands:
* escape sequences are enabled by default, and
* -n, -e and -E are recognized if they appear
* in arguments with no illegal options (ie, echo -nq
* will print -nq).
* Different from sysV echo since options are recognized,
* different from BSD echo since escape sequences are enabled
* by default.
*/
wp += 1;
if (Flag(FPOSIX)) {
if (*wp && strcmp(*wp, "-n") == 0) {
flags &= ~PO_NL;
wp++;
}
} else {
while ((s = *wp) && *s == '-' && s[1]) {
while (*++s)
if (*s == 'n')
nflags &= ~PO_NL;
else if (*s == 'e')
nflags |= PO_EXPAND;
else if (*s == 'E')
nflags &= ~PO_EXPAND;
else
/* bad option: don't use
* nflags, print argument
*/
break;
if (*s)
break;
wp++;
flags = nflags;
}
}
} else {
int optc;
const char *options = "Rnprsu,";
while ((optc = ksh_getopt(wp, &builtin_opt, options)) != -1)
switch (optc) {
case 'R': /* fake BSD echo command */
flags |= PO_PMINUSMINUS;
flags &= ~PO_EXPAND;
options = "ne";
break;
case 'e':
flags |= PO_EXPAND;
break;
case 'n':
flags &= ~PO_NL;
break;
case 'p':
if ((fd = coproc_getfd(W_OK, &emsg)) < 0) {
bi_errorf("-p: %s", emsg);
return 1;
}
break;
case 'r':
flags &= ~PO_EXPAND;
break;
case 's':
flags |= PO_HIST;
break;
case 'u':
if (!*(s = builtin_opt.optarg))
fd = 0;
else if ((fd = check_fd(s, W_OK, &emsg)) < 0) {
bi_errorf("-u: %s: %s", s, emsg);
return 1;
}
break;
case '?':
return 1;
}
if (!(builtin_opt.info & GI_MINUSMINUS)) {
/* treat a lone - like -- */
if (wp[builtin_opt.optind] &&
strcmp(wp[builtin_opt.optind], "-") == 0)
builtin_opt.optind++;
} else if (flags & PO_PMINUSMINUS)
builtin_opt.optind--;
wp += builtin_opt.optind;
}
Xinit(xs, xp, 128, ATEMP);
while (*wp != NULL) {
int c;
s = *wp;
while ((c = *s++) != '\0') {
Xcheck(xs, xp);
if ((flags & PO_EXPAND) && c == '\\') {
int i;
switch ((c = *s++)) {
/* Oddly enough, \007 seems more portable than
* \a (due to HP-UX cc, Ultrix cc, old pcc's,
* etc.).
*/
case 'a': c = '\007'; break;
case 'b': c = '\b'; break;
case 'c': flags &= ~PO_NL;
continue; /* AT&T brain damage */
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
case 'v': c = 0x0B; break;
case '0':
/* Look for an octal number: can have
* three digits (not counting the
* leading 0). Truly burnt.
*/
c = 0;
for (i = 0; i < 3; i++) {
if (*s >= '0' && *s <= '7')
c = c*8 + *s++ - '0';
else
break;
}
break;
case '\0': s--; c = '\\'; break;
case '\\': break;
default:
Xput(xs, xp, '\\');
}
}
Xput(xs, xp, c);
}
if (*++wp != NULL)
Xput(xs, xp, ' ');
}
if (flags & PO_NL)
Xput(xs, xp, '\n');
if (flags & PO_HIST) {
Xput(xs, xp, '\0');
source->line++;
histsave(source->line, Xstring(xs, xp), 1);
Xfree(xs, xp);
} else {
int n, len = Xlength(xs, xp);
int opipe = 0;
/* Ensure we aren't killed by a SIGPIPE while writing to
* a coprocess. at&t ksh doesn't seem to do this (seems
* to just check that the co-process is alive, which is
* not enough).
*/
if (coproc.write >= 0 && coproc.write == fd) {
flags |= PO_COPROC;
opipe = block_pipe();
}
for (s = Xstring(xs, xp); len > 0; ) {
n = write(fd, s, len);
if (n == -1) {
if (flags & PO_COPROC)
restore_pipe(opipe);
if (errno == EINTR) {
/* allow user to ^C out */
intrcheck();
if (flags & PO_COPROC)
opipe = block_pipe();
continue;
}
/* This doesn't really make sense - could
* break scripts (print -p generates
* error message).
*if (errno == EPIPE)
* coproc_write_close(fd);
*/
return 1;
}
s += n;
len -= n;
}
if (flags & PO_COPROC)
restore_pipe(opipe);
}
return 0;
}
int
c_whence(char **wp)
{
struct tbl *tp;
char *id;
int pflag = 0, vflag = 0, Vflag = 0;
int ret = 0;
int optc;
int iam_whence;
int fcflags;
const char *options;
switch (wp[0][0]) {
case 'c': /* command */
iam_whence = 0;
options = "pvV";
break;
case 't': /* type */
vflag = 1;
/* FALLTHROUGH */
case 'w': /* whence */
iam_whence = 1;
options = "pv";
break;
default:
bi_errorf("builtin not handled by %s", __func__);
return 1;
}
while ((optc = ksh_getopt(wp, &builtin_opt, options)) != -1)
switch (optc) {
case 'p':
pflag = 1;
break;
case 'v':
vflag = 1;
break;
case 'V':
Vflag = 1;
break;
case '?':
return 1;
}
wp += builtin_opt.optind;
fcflags = FC_BI | FC_PATH | FC_FUNC;
if (!iam_whence) {
/* Note that -p on its own is dealt with in comexec() */
if (pflag)
fcflags |= FC_DEFPATH;
/* Convert command options to whence options. Note that
* command -pV and command -pv use a different path search
* than whence -v or whence -pv. This should be considered
* a feature.
*/
vflag = Vflag;
} else if (pflag)
fcflags &= ~(FC_BI | FC_FUNC);
while ((vflag || ret == 0) && (id = *wp++) != NULL) {
tp = NULL;
if (!iam_whence || !pflag)
tp = ktsearch(&keywords, id, hash(id));
if (!tp && (!iam_whence || !pflag)) {
tp = ktsearch(&aliases, id, hash(id));
if (tp && !(tp->flag & ISSET))
tp = NULL;
}
if (!tp)
tp = findcom(id, fcflags);
if (vflag || (tp->type != CALIAS && tp->type != CEXEC &&
tp->type != CTALIAS))
shprintf("%s", id);
switch (tp->type) {
case CKEYWD:
if (vflag)
shprintf(" is a reserved word");
break;
case CALIAS:
if (vflag)
shprintf(" is an %salias for ",
(tp->flag & EXPORT) ? "exported " : "");
if (!iam_whence && !vflag)
shprintf("alias %s=", id);
print_value_quoted(tp->val.s);
break;
case CFUNC:
if (vflag) {
shprintf(" is a");
if (tp->flag & EXPORT)
shprintf("n exported");
if (tp->flag & TRACE)
shprintf(" traced");
if (!(tp->flag & ISSET)) {
shprintf(" undefined");
if (tp->u.fpath)
shprintf(" (autoload from %s)",
tp->u.fpath);
}
shprintf(" function");
}
break;
case CSHELL:
if (vflag)
shprintf(" is a%s shell builtin",
(tp->flag & SPEC_BI) ? " special" : "");
break;
case CTALIAS:
case CEXEC:
if (tp->flag & ISSET) {
if (vflag) {
shprintf(" is ");
if (tp->type == CTALIAS)
shprintf("a tracked %salias for ",
(tp->flag & EXPORT) ?
"exported " : "");
}
shprintf("%s", tp->val.s);
} else {
if (vflag)
shprintf(" not found");
ret = 1;
}
break;
default:
shprintf("%s is *GOK*", id);
break;
}
if (vflag || !ret)
shprintf("\n");
}
return ret;
}
/* Deal with command -vV - command -p dealt with in comexec() */
int
c_command(char **wp)
{
/* Let c_whence do the work. Note that c_command() must be
* a distinct function from c_whence() (tested in comexec()).
*/
return c_whence(wp);
}
int
c_type(char **wp)
{
/* Let c_whence do the work. type = command -V = whence -v */
return c_whence(wp);
}
/* typeset, export, and readonly */
int
c_typeset(char **wp)
{
struct block *l;
struct tbl *vp, **p;
int fset = 0, fclr = 0, thing = 0, func = 0, local = 0, pflag = 0;
const char *options = "L#R#UZ#fi#lprtux"; /* see comment below */
char *fieldstr, *basestr;
int field, base, optc, flag;
switch (**wp) {
case 'e': /* export */
fset |= EXPORT;
options = "p";
break;
case 'r': /* readonly */
fset |= RDONLY;
options = "p";
break;
case 's': /* set */
/* called with 'typeset -' */
break;
case 't': /* typeset */
local = 1;
break;
}
fieldstr = basestr = NULL;
builtin_opt.flags |= GF_PLUSOPT;
/* at&t ksh seems to have 0-9 as options, which are multiplied
* to get a number that is used with -L, -R, -Z or -i (eg, -1R2
* sets right justify in a field of 12). This allows options
* to be grouped in an order (eg, -Lu12), but disallows -i8 -L3 and
* does not allow the number to be specified as a separate argument
* Here, the number must follow the RLZi option, but is optional
* (see the # kludge in ksh_getopt()).
*/
while ((optc = ksh_getopt(wp, &builtin_opt, options)) != -1) {
flag = 0;
switch (optc) {
case 'L':
flag = LJUST;
fieldstr = builtin_opt.optarg;
break;
case 'R':
flag = RJUST;
fieldstr = builtin_opt.optarg;
break;
case 'U':
/* at&t ksh uses u, but this conflicts with
* upper/lower case. If this option is changed,
* need to change the -U below as well
*/
flag = INT_U;
break;
case 'Z':
flag = ZEROFIL;
fieldstr = builtin_opt.optarg;
break;
case 'f':
func = 1;
break;
case 'i':
flag = INTEGER;
basestr = builtin_opt.optarg;
break;
case 'l':
flag = LCASEV;
break;
case 'p':
/* posix export/readonly -p flag.
* typeset -p is the same as typeset (in pdksh);
* here for compatibility with ksh93.
*/
pflag = 1;
break;
case 'r':
flag = RDONLY;
break;
case 't':
flag = TRACE;
break;
case 'u':
flag = UCASEV_AL; /* upper case / autoload */
break;
case 'x':
flag = EXPORT;
break;
case '?':
return 1;
}
if (builtin_opt.info & GI_PLUS) {
fclr |= flag;
fset &= ~flag;
thing = '+';
} else {
fset |= flag;
fclr &= ~flag;
thing = '-';
}
}
field = 0;
if (fieldstr && !bi_getn(fieldstr, &field))
return 1;
base = 0;
if (basestr && !bi_getn(basestr, &base))
return 1;
if (!(builtin_opt.info & GI_MINUSMINUS) && wp[builtin_opt.optind] &&
(wp[builtin_opt.optind][0] == '-' ||
wp[builtin_opt.optind][0] == '+') &&
wp[builtin_opt.optind][1] == '\0') {
thing = wp[builtin_opt.optind][0];
builtin_opt.optind++;
}
if (func && ((fset|fclr) & ~(TRACE|UCASEV_AL|EXPORT))) {
bi_errorf("only -t, -u and -x options may be used with -f");
return 1;
}
if (wp[builtin_opt.optind]) {
/* Take care of exclusions.
* At this point, flags in fset are cleared in fclr and vise
* versa. This property should be preserved.
*/
if (fset & LCASEV) /* LCASEV has priority over UCASEV_AL */
fset &= ~UCASEV_AL;
if (fset & LJUST) /* LJUST has priority over RJUST */
fset &= ~RJUST;
if ((fset & (ZEROFIL|LJUST)) == ZEROFIL) { /* -Z implies -ZR */
fset |= RJUST;
fclr &= ~RJUST;
}
/* Setting these attributes clears the others, unless they
* are also set in this command
*/
if (fset & (LJUST | RJUST | ZEROFIL | UCASEV_AL | LCASEV |
INTEGER | INT_U | INT_L))
fclr |= ~fset & (LJUST | RJUST | ZEROFIL | UCASEV_AL |
LCASEV | INTEGER | INT_U | INT_L);
}
/* set variables and attributes */
if (wp[builtin_opt.optind]) {
int i;
int rval = 0;
struct tbl *f;
if (local && !func)
fset |= LOCAL;
for (i = builtin_opt.optind; wp[i]; i++) {
if (func) {
f = findfunc(wp[i], hash(wp[i]),
(fset&UCASEV_AL) ? true : false);
if (!f) {
/* at&t ksh does ++rval: bogus */
rval = 1;
continue;
}
if (fset | fclr) {
f->flag |= fset;
f->flag &= ~fclr;
} else
fptreef(shl_stdout, 0,
f->flag & FKSH ?
"function %s %T\n" :
"%s() %T\n", wp[i], f->val.t);
} else if (!typeset(wp[i], fset, fclr, field, base)) {
bi_errorf("%s: not identifier", wp[i]);
return 1;
}
}
return rval;
}
/* list variables and attributes */
flag = fset | fclr; /* no difference at this point.. */
if (func) {
for (l = genv->loc; l; l = l->next) {
for (p = ktsort(&l->funs); (vp = *p++); ) {
if (flag && (vp->flag & flag) == 0)
continue;
if (thing == '-')
fptreef(shl_stdout, 0, vp->flag & FKSH ?
"function %s %T\n" : "%s() %T\n",
vp->name, vp->val.t);
else
shprintf("%s\n", vp->name);
}
}
} else {
for (l = genv->loc; l; l = l->next) {
for (p = ktsort(&l->vars); (vp = *p++); ) {
struct tbl *tvp;
int any_set = 0;
/*
* See if the parameter is set (for arrays, if any
* element is set).
*/
for (tvp = vp; tvp; tvp = tvp->u.array)
if (tvp->flag & ISSET) {
any_set = 1;
break;
}
/*
* Check attributes - note that all array elements
* have (should have?) the same attributes, so checking
* the first is sufficient.
*
* Report an unset param only if the user has
* explicitly given it some attribute (like export);
* otherwise, after "echo $FOO", we would report FOO...
*/
if (!any_set && !(vp->flag & USERATTRIB))
continue;
if (flag && (vp->flag & flag) == 0)
continue;
for (; vp; vp = vp->u.array) {
/* Ignore array elements that aren't
* set unless there are no set elements,
* in which case the first is reported on */
if ((vp->flag&ARRAY) && any_set &&
!(vp->flag & ISSET))
continue;
/* no arguments */
if (thing == 0 && flag == 0) {
/* at&t ksh prints things
* like export, integer,
* leftadj, zerofill, etc.,
* but POSIX says must
* be suitable for re-entry...
*/
shprintf("typeset ");
if ((vp->flag&INTEGER))
shprintf("-i ");
if ((vp->flag&EXPORT))
shprintf("-x ");
if ((vp->flag&RDONLY))
shprintf("-r ");
if ((vp->flag&TRACE))
shprintf("-t ");
if ((vp->flag&LJUST))
shprintf("-L%d ", vp->u2.field);
if ((vp->flag&RJUST))
shprintf("-R%d ", vp->u2.field);
if ((vp->flag&ZEROFIL))
shprintf("-Z ");
if ((vp->flag&LCASEV))
shprintf("-l ");
if ((vp->flag&UCASEV_AL))
shprintf("-u ");
if ((vp->flag&INT_U))
shprintf("-U ");
shprintf("%s\n", vp->name);
if (vp->flag&ARRAY)
break;
} else {
if (pflag)
shprintf("%s ",
(flag & EXPORT) ?
"export" : "readonly");
if ((vp->flag&ARRAY) && any_set)
shprintf("%s[%d]",
vp->name, vp->index);
else
shprintf("%s", vp->name);
if (thing == '-' && (vp->flag&ISSET)) {
char *s = str_val(vp);
shprintf("=");
/* at&t ksh can't have
* justified integers.. */
if ((vp->flag &
(INTEGER|LJUST|RJUST)) ==
INTEGER)
shprintf("%s", s);
else
print_value_quoted(s);
}
shprintf("\n");
}
/* Only report first `element' of an array with
* no set elements.
*/
if (!any_set)
break;
}
}
}
}
return 0;
}
int
c_alias(char **wp)
{
struct table *t = &aliases;
int rv = 0, rflag = 0, tflag, Uflag = 0, pflag = 0, prefix = 0;
int xflag = 0;
int optc;
builtin_opt.flags |= GF_PLUSOPT;
while ((optc = ksh_getopt(wp, &builtin_opt, "dprtUx")) != -1) {
prefix = builtin_opt.info & GI_PLUS ? '+' : '-';
switch (optc) {
case 'd':
t = &homedirs;
break;
case 'p':
pflag = 1;
break;
case 'r':
rflag = 1;
break;
case 't':
t = &taliases;
break;
case 'U':
/*
* kludge for tracked alias initialization
* (don't do a path search, just make an entry)
*/
Uflag = 1;
break;
case 'x':
xflag = EXPORT;
break;
case '?':
return 1;
}
}
wp += builtin_opt.optind;
if (!(builtin_opt.info & GI_MINUSMINUS) && *wp &&
(wp[0][0] == '-' || wp[0][0] == '+') && wp[0][1] == '\0') {
prefix = wp[0][0];
wp++;
}
tflag = t == &taliases;
/* "hash -r" means reset all the tracked aliases.. */
if (rflag) {
static const char *const args[] = {
"unalias", "-ta", NULL
};
if (!tflag || *wp) {
shprintf("alias: -r flag can only be used with -t"
" and without arguments\n");
return 1;
}
ksh_getopt_reset(&builtin_opt, GF_ERROR);
return c_unalias((char **) args);
}
if (*wp == NULL) {
struct tbl *ap, **p;
for (p = ktsort(t); (ap = *p++) != NULL; )
if ((ap->flag & (ISSET|xflag)) == (ISSET|xflag)) {
if (pflag)
shf_puts("alias ", shl_stdout);
shf_puts(ap->name, shl_stdout);
if (prefix != '+') {
shf_putc('=', shl_stdout);
print_value_quoted(ap->val.s);
}
shprintf("\n");
}
}
for (; *wp != NULL; wp++) {
char *alias = *wp;
char *val = strchr(alias, '=');
char *newval;
struct tbl *ap;
int h;
if (val)
alias = str_nsave(alias, val++ - alias, ATEMP);
h = hash(alias);
if (val == NULL && !tflag && !xflag) {
ap = ktsearch(t, alias, h);
if (ap != NULL && (ap->flag&ISSET)) {
if (pflag)
shf_puts("alias ", shl_stdout);
shf_puts(ap->name, shl_stdout);
if (prefix != '+') {
shf_putc('=', shl_stdout);
print_value_quoted(ap->val.s);
}
shprintf("\n");
} else {
shprintf("%s alias not found\n", alias);
rv = 1;
}
continue;
}
ap = ktenter(t, alias, h);
ap->type = tflag ? CTALIAS : CALIAS;
/* Are we setting the value or just some flags? */
if ((val && !tflag) || (!val && tflag && !Uflag)) {
if (ap->flag&ALLOC) {
ap->flag &= ~(ALLOC|ISSET);
afree(ap->val.s, APERM);
}
/* ignore values for -t (at&t ksh does this) */
newval = tflag ? search(alias, search_path, X_OK, NULL)
: val;
if (newval) {
ap->val.s = str_save(newval, APERM);
ap->flag |= ALLOC|ISSET;
} else
ap->flag &= ~ISSET;
}
ap->flag |= DEFINED;
if (prefix == '+')
ap->flag &= ~xflag;
else
ap->flag |= xflag;
if (val)
afree(alias, ATEMP);
}
return rv;
}
int
c_unalias(char **wp)
{
struct table *t = &aliases;
struct tbl *ap;
int rv = 0, all = 0;
int optc;
while ((optc = ksh_getopt(wp, &builtin_opt, "adt")) != -1)
switch (optc) {
case 'a':
all = 1;
break;
case 'd':