Source *
pushs(int type, Area *areap)
{
Source *s;
s = alloc(sizeof(Source), areap);
memset(s, 0, sizeof(Source));
s->type = type;
s->str = null;
s->areap = areap;
if (type == SFILE || type == SSTDIN)
XinitN(s->xs, 256, s->areap);
return (s);
}
int
c_cd(const char **wp)
{
int optc, rv, phys_path;
bool physical = tobool(Flag(FPHYSICAL));
/* was a node from cdpath added in? */
int cdnode;
/* show where we went?, error for $PWD */
bool printpath = false, eflag = false;
struct tbl *pwd_s, *oldpwd_s;
XString xs;
char *dir, *allocd = NULL, *tryp, *pwd, *cdpath;
while ((optc = ksh_getopt(wp, &builtin_opt, "eLP")) != -1)
switch (optc) {
case 'e':
eflag = true;
break;
case 'L':
physical = false;
break;
case 'P':
physical = true;
break;
case '?':
return (2);
}
wp += builtin_opt.optind;
if (Flag(FRESTRICTED)) {
bi_errorf("restricted shell - can't cd");
return (2);
}
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 (2);
}
} else if (!wp[1]) {
/* One argument: - or dir */
strdupx(allocd, wp[0], ATEMP);
if (ksh_isdash((dir = allocd))) {
afree(allocd, ATEMP);
allocd = NULL;
dir = str_val(oldpwd_s);
if (dir == null) {
bi_errorf("no OLDPWD");
return (2);
}
printpath = true;
}
} else if (!wp[2]) {
/* Two arguments - substitute arg1 in PWD for arg2 */
size_t ilen, olen, nlen, elen;
char *cp;
if (!current_wd[0]) {
bi_errorf("can't determine current directory");
return (2);
}
/*
* 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 (2);
}
/*-
* ilen = part of current_wd before wp[0]
* elen = part of current_wd after wp[0]
* because current_wd and wp[1] need to be in memory at the
* same time beforehand the addition can stay unchecked
*/
ilen = cp - current_wd;
olen = strlen(wp[0]);
nlen = strlen(wp[1]);
elen = strlen(current_wd + ilen + olen) + 1;
dir = allocd = 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 = true;
} else {
bi_errorf("too many arguments");
return (2);
}
#ifdef MKSH__NO_PATH_MAX
/* only a first guess; make_path will enlarge xs if necessary */
XinitN(xs, 1024, ATEMP);
#else
XinitN(xs, PATH_MAX, ATEMP);
#endif
cdpath = str_val(global("CDPATH"));
do {
cdnode = make_path(current_wd, dir, &cdpath, &xs, &phys_path);
if (physical)
rv = chdir(tryp = Xstring(xs, xp) + phys_path);
else {
simplify_path(Xstring(xs, xp));
rv = chdir(tryp = Xstring(xs, xp));
}
} while (rv < 0 && cdpath != NULL);
if (rv < 0) {
if (cdnode)
bi_errorf("%s: %s", dir, "bad directory");
else
bi_errorf("%s: %s", tryp, cstrerror(errno));
afree(allocd, ATEMP);
Xfree(xs, xp);
return (2);
}
rv = 0;
/* allocd (above) => dir, which is no longer used */
afree(allocd, ATEMP);
allocd = NULL;
/* Clear out tracked aliases with relative paths */
flushcom(false);
/*
* 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 (!mksh_abspath(Xstring(xs, xp))) {
pwd = NULL;
} else if (!physical) {
goto norealpath_PWD;
} else if ((pwd = allocd = do_realpath(Xstring(xs, xp))) == NULL) {
if (eflag)
rv = 1;
norealpath_PWD:
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 (eflag)
rv = 1;
}
if (printpath || cdnode)
shprintf("%s\n", pwd);
afree(allocd, ATEMP);
Xfree(xs, xp);
return (rv);
}