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-rw-r--r--bin/csh/dir.c930
1 files changed, 930 insertions, 0 deletions
diff --git a/bin/csh/dir.c b/bin/csh/dir.c
new file mode 100644
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--- /dev/null
+++ b/bin/csh/dir.c
@@ -0,0 +1,930 @@
+/*-
+ * Copyright (c) 1980, 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * 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.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)dir.c 8.1 (Berkeley) 5/31/93";
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#if __STDC__
+# include <stdarg.h>
+#else
+# include <varargs.h>
+#endif
+
+#include "csh.h"
+#include "dir.h"
+#include "extern.h"
+
+/* Directory management. */
+
+static struct directory
+ *dfind __P((Char *));
+static Char *dfollow __P((Char *));
+static void printdirs __P((void));
+static Char *dgoto __P((Char *));
+static void dnewcwd __P((struct directory *));
+static void dset __P((Char *));
+
+struct directory dhead; /* "head" of loop */
+int printd; /* force name to be printed */
+
+static int dirflag = 0;
+
+/*
+ * dinit - initialize current working directory
+ */
+void
+dinit(hp)
+ Char *hp;
+{
+ register char *tcp;
+ register Char *cp;
+ register struct directory *dp;
+ char path[MAXPATHLEN];
+ static char *emsg = "csh: Trying to start from \"%s\"\n";
+
+ /* Don't believe the login shell home, because it may be a symlink */
+ tcp = getwd(path); /* see ngetwd.c for System V version */
+ if (tcp == NULL || *tcp == '\0') {
+ (void) fprintf(csherr, "csh: %s\n", path);
+ if (hp && *hp) {
+ tcp = short2str(hp);
+ if (chdir(tcp) == -1)
+ cp = NULL;
+ else
+ cp = hp;
+ (void) fprintf(csherr, emsg, vis_str(hp));
+ }
+ else
+ cp = NULL;
+ if (cp == NULL) {
+ (void) fprintf(csherr, emsg, "/");
+ if (chdir("/") == -1)
+ /* I am not even try to print an error message! */
+ xexit(1);
+ cp = SAVE("/");
+ }
+ }
+ else {
+ struct stat swd, shp;
+
+ /*
+ * See if $HOME is the working directory we got and use that
+ */
+ if (hp && *hp &&
+ stat(tcp, &swd) != -1 && stat(short2str(hp), &shp) != -1 &&
+ swd.st_dev == shp.st_dev && swd.st_ino == shp.st_ino)
+ cp = hp;
+ else {
+ char *cwd;
+
+ /*
+ * use PWD if we have it (for subshells)
+ */
+ if ((cwd = getenv("PWD")) != NULL) {
+ if (stat(cwd, &shp) != -1 && swd.st_dev == shp.st_dev &&
+ swd.st_ino == shp.st_ino)
+ tcp = cwd;
+ }
+ cp = dcanon(SAVE(tcp), STRNULL);
+ }
+ }
+
+ dp = (struct directory *) xcalloc(sizeof(struct directory), 1);
+ dp->di_name = Strsave(cp);
+ dp->di_count = 0;
+ dhead.di_next = dhead.di_prev = dp;
+ dp->di_next = dp->di_prev = &dhead;
+ printd = 0;
+ dnewcwd(dp);
+}
+
+static void
+dset(dp)
+Char *dp;
+{
+ /*
+ * Don't call set() directly cause if the directory contains ` or
+ * other junk characters glob will fail.
+ */
+ register Char **vec = (Char **) xmalloc((size_t) (2 * sizeof(Char **)));
+
+ vec[0] = Strsave(dp);
+ vec[1] = 0;
+ setq(STRcwd, vec, &shvhed);
+ Setenv(STRPWD, dp);
+}
+
+#define DIR_LONG 1
+#define DIR_VERT 2
+#define DIR_LINE 4
+
+static void
+skipargs(v, str)
+ Char ***v;
+ char *str;
+{
+ Char **n = *v, *s;
+
+ dirflag = 0;
+ for (n++; *n != NULL && (*n)[0] == '-'; n++)
+ for (s = &((*n)[1]); *s; s++)
+ switch (*s) {
+ case 'l':
+ dirflag |= DIR_LONG;
+ break;
+ case 'v':
+ dirflag |= DIR_VERT;
+ break;
+ case 'n':
+ dirflag |= DIR_LINE;
+ break;
+ default:
+ stderror(ERR_DIRUS, vis_str(**v), str);
+ break;
+ }
+ *v = n;
+}
+
+/*
+ * dodirs - list all directories in directory loop
+ */
+void
+/*ARGSUSED*/
+dodirs(v, t)
+ Char **v;
+ struct command *t;
+{
+ skipargs(&v, "");
+
+ if (*v != NULL)
+ stderror(ERR_DIRUS, "dirs", "");
+ printdirs();
+}
+
+static void
+printdirs()
+{
+ register struct directory *dp;
+ Char *s, *hp = value(STRhome);
+ int idx, len, cur;
+
+ if (*hp == '\0')
+ hp = NULL;
+ dp = dcwd;
+ idx = 0;
+ cur = 0;
+ do {
+ if (dp == &dhead)
+ continue;
+ if (dirflag & DIR_VERT) {
+ (void) fprintf(cshout, "%d\t", idx++);
+ cur = 0;
+ }
+ if (!(dirflag & DIR_LONG) && hp != NULL && !eq(hp, STRslash) &&
+ (len = Strlen(hp), Strncmp(hp, dp->di_name, len) == 0) &&
+ (dp->di_name[len] == '\0' || dp->di_name[len] == '/'))
+ len = Strlen(s = (dp->di_name + len)) + 2;
+ else
+ len = Strlen(s = dp->di_name) + 1;
+
+ cur += len;
+ if ((dirflag & DIR_LINE) && cur >= 80 - 1 && len < 80) {
+ (void) fprintf(cshout, "\n");
+ cur = len;
+ }
+ (void) fprintf(cshout, s != dp->di_name ? "~%s%c" : "%s%c",
+ vis_str(s), (dirflag & DIR_VERT) ? '\n' : ' ');
+ } while ((dp = dp->di_prev) != dcwd);
+ if (!(dirflag & DIR_VERT))
+ (void) fprintf(cshout, "\n");
+}
+
+void
+dtildepr(home, dir)
+ register Char *home, *dir;
+{
+
+ if (!eq(home, STRslash) && prefix(home, dir))
+ (void) fprintf(cshout, "~%s", vis_str(dir + Strlen(home)));
+ else
+ (void) fprintf(cshout, "%s", vis_str(dir));
+}
+
+void
+dtilde()
+{
+ struct directory *d = dcwd;
+
+ do {
+ if (d == &dhead)
+ continue;
+ d->di_name = dcanon(d->di_name, STRNULL);
+ } while ((d = d->di_prev) != dcwd);
+
+ dset(dcwd->di_name);
+}
+
+
+/* dnormalize():
+ * If the name starts with . or .. then we might need to normalize
+ * it depending on the symbolic link flags
+ */
+Char *
+dnormalize(cp)
+ Char *cp;
+{
+
+#define UC (unsigned char)
+#define ISDOT(c) (UC(c)[0] == '.' && ((UC(c)[1] == '\0') || (UC(c)[1] == '/')))
+#define ISDOTDOT(c) (UC(c)[0] == '.' && ISDOT(&((c)[1])))
+
+ if ((unsigned char) cp[0] == '/')
+ return (Strsave(cp));
+
+ if (adrof(STRignore_symlinks)) {
+ int dotdot = 0;
+ Char *dp, *cwd;
+
+ cwd = (Char *) xmalloc((size_t) ((Strlen(dcwd->di_name) + 3) *
+ sizeof(Char)));
+ (void) Strcpy(cwd, dcwd->di_name);
+
+ /*
+ * Ignore . and count ..'s
+ */
+ while (*cp) {
+ if (ISDOT(cp)) {
+ if (*++cp)
+ cp++;
+ }
+ else if (ISDOTDOT(cp)) {
+ dotdot++;
+ cp += 2;
+ if (*cp)
+ cp++;
+ }
+ else
+ break;
+ }
+ while (dotdot > 0)
+ if ((dp = Strrchr(cwd, '/'))) {
+ *dp = '\0';
+ dotdot--;
+ }
+ else
+ break;
+
+ if (*cp) {
+ cwd[dotdot = Strlen(cwd)] = '/';
+ cwd[dotdot + 1] = '\0';
+ dp = Strspl(cwd, cp);
+ xfree((ptr_t) cwd);
+ return dp;
+ }
+ else {
+ if (!*cwd) {
+ cwd[0] = '/';
+ cwd[1] = '\0';
+ }
+ return cwd;
+ }
+ }
+ return Strsave(cp);
+}
+
+/*
+ * dochngd - implement chdir command.
+ */
+void
+/*ARGSUSED*/
+dochngd(v, t)
+ Char **v;
+ struct command *t;
+{
+ register Char *cp;
+ register struct directory *dp;
+
+ skipargs(&v, " [<dir>]");
+ printd = 0;
+ if (*v == NULL) {
+ if ((cp = value(STRhome)) == NULL || *cp == 0)
+ stderror(ERR_NAME | ERR_NOHOMEDIR);
+ if (chdir(short2str(cp)) < 0)
+ stderror(ERR_NAME | ERR_CANTCHANGE);
+ cp = Strsave(cp);
+ }
+ else if (v[1] != NULL) {
+ stderror(ERR_NAME | ERR_TOOMANY);
+ /* NOTREACHED */
+ return;
+ }
+ else if ((dp = dfind(*v)) != 0) {
+ char *tmp;
+
+ printd = 1;
+ if (chdir(tmp = short2str(dp->di_name)) < 0)
+ stderror(ERR_SYSTEM, tmp, strerror(errno));
+ dcwd->di_prev->di_next = dcwd->di_next;
+ dcwd->di_next->di_prev = dcwd->di_prev;
+ dfree(dcwd);
+ dnewcwd(dp);
+ return;
+ }
+ else
+ cp = dfollow(*v);
+ dp = (struct directory *) xcalloc(sizeof(struct directory), 1);
+ dp->di_name = cp;
+ dp->di_count = 0;
+ dp->di_next = dcwd->di_next;
+ dp->di_prev = dcwd->di_prev;
+ dp->di_prev->di_next = dp;
+ dp->di_next->di_prev = dp;
+ dfree(dcwd);
+ dnewcwd(dp);
+}
+
+static Char *
+dgoto(cp)
+ Char *cp;
+{
+ Char *dp;
+
+ if (*cp != '/') {
+ register Char *p, *q;
+ int cwdlen;
+
+ for (p = dcwd->di_name; *p++;)
+ continue;
+ if ((cwdlen = p - dcwd->di_name - 1) == 1) /* root */
+ cwdlen = 0;
+ for (p = cp; *p++;)
+ continue;
+ dp = (Char *) xmalloc((size_t)((cwdlen + (p - cp) + 1) * sizeof(Char)));
+ for (p = dp, q = dcwd->di_name; (*p++ = *q++) != '\0';)
+ continue;
+ if (cwdlen)
+ p[-1] = '/';
+ else
+ p--; /* don't add a / after root */
+ for (q = cp; (*p++ = *q++) != '\0';)
+ continue;
+ xfree((ptr_t) cp);
+ cp = dp;
+ dp += cwdlen;
+ }
+ else
+ dp = cp;
+
+ cp = dcanon(cp, dp);
+ return cp;
+}
+
+/*
+ * dfollow - change to arg directory; fall back on cdpath if not valid
+ */
+static Char *
+dfollow(cp)
+ register Char *cp;
+{
+ register Char *dp;
+ struct varent *c;
+ char ebuf[MAXPATHLEN];
+ int serrno;
+
+ cp = globone(cp, G_ERROR);
+ /*
+ * if we are ignoring symlinks, try to fix relatives now.
+ */
+ dp = dnormalize(cp);
+ if (chdir(short2str(dp)) >= 0) {
+ xfree((ptr_t) cp);
+ return dgoto(dp);
+ }
+ else {
+ xfree((ptr_t) dp);
+ if (chdir(short2str(cp)) >= 0)
+ return dgoto(cp);
+ serrno = errno;
+ }
+
+ if (cp[0] != '/' && !prefix(STRdotsl, cp) && !prefix(STRdotdotsl, cp)
+ && (c = adrof(STRcdpath))) {
+ Char **cdp;
+ register Char *p;
+ Char buf[MAXPATHLEN];
+
+ for (cdp = c->vec; *cdp; cdp++) {
+ for (dp = buf, p = *cdp; (*dp++ = *p++) != '\0';)
+ continue;
+ dp[-1] = '/';
+ for (p = cp; (*dp++ = *p++) != '\0';)
+ continue;
+ if (chdir(short2str(buf)) >= 0) {
+ printd = 1;
+ xfree((ptr_t) cp);
+ cp = Strsave(buf);
+ return dgoto(cp);
+ }
+ }
+ }
+ dp = value(cp);
+ if ((dp[0] == '/' || dp[0] == '.') && chdir(short2str(dp)) >= 0) {
+ xfree((ptr_t) cp);
+ cp = Strsave(dp);
+ printd = 1;
+ return dgoto(cp);
+ }
+ (void) strcpy(ebuf, short2str(cp));
+ xfree((ptr_t) cp);
+ stderror(ERR_SYSTEM, ebuf, strerror(serrno));
+ return (NULL);
+}
+
+
+/*
+ * dopushd - push new directory onto directory stack.
+ * with no arguments exchange top and second.
+ * with numeric argument (+n) bring it to top.
+ */
+void
+/*ARGSUSED*/
+dopushd(v, t)
+ Char **v;
+ struct command *t;
+{
+ register struct directory *dp;
+
+ skipargs(&v, " [<dir>|+<n>]");
+ printd = 1;
+ if (*v == NULL) {
+ char *tmp;
+
+ if ((dp = dcwd->di_prev) == &dhead)
+ dp = dhead.di_prev;
+ if (dp == dcwd)
+ stderror(ERR_NAME | ERR_NODIR);
+ if (chdir(tmp = short2str(dp->di_name)) < 0)
+ stderror(ERR_SYSTEM, tmp, strerror(errno));
+ dp->di_prev->di_next = dp->di_next;
+ dp->di_next->di_prev = dp->di_prev;
+ dp->di_next = dcwd->di_next;
+ dp->di_prev = dcwd;
+ dcwd->di_next->di_prev = dp;
+ dcwd->di_next = dp;
+ }
+ else if (v[1] != NULL) {
+ stderror(ERR_NAME | ERR_TOOMANY);
+ /* NOTREACHED */
+ return;
+ }
+ else if ((dp = dfind(*v)) != NULL) {
+ char *tmp;
+
+ if (chdir(tmp = short2str(dp->di_name)) < 0)
+ stderror(ERR_SYSTEM, tmp, strerror(errno));
+ }
+ else {
+ register Char *ccp;
+
+ ccp = dfollow(*v);
+ dp = (struct directory *) xcalloc(sizeof(struct directory), 1);
+ dp->di_name = ccp;
+ dp->di_count = 0;
+ dp->di_prev = dcwd;
+ dp->di_next = dcwd->di_next;
+ dcwd->di_next = dp;
+ dp->di_next->di_prev = dp;
+ }
+ dnewcwd(dp);
+}
+
+/*
+ * dfind - find a directory if specified by numeric (+n) argument
+ */
+static struct directory *
+dfind(cp)
+ register Char *cp;
+{
+ register struct directory *dp;
+ register int i;
+ register Char *ep;
+
+ if (*cp++ != '+')
+ return (0);
+ for (ep = cp; Isdigit(*ep); ep++)
+ continue;
+ if (*ep)
+ return (0);
+ i = getn(cp);
+ if (i <= 0)
+ return (0);
+ for (dp = dcwd; i != 0; i--) {
+ if ((dp = dp->di_prev) == &dhead)
+ dp = dp->di_prev;
+ if (dp == dcwd)
+ stderror(ERR_NAME | ERR_DEEP);
+ }
+ return (dp);
+}
+
+/*
+ * dopopd - pop a directory out of the directory stack
+ * with a numeric argument just discard it.
+ */
+void
+/*ARGSUSED*/
+dopopd(v, t)
+ Char **v;
+ struct command *t;
+{
+ register struct directory *dp, *p = NULL;
+
+ skipargs(&v, " [+<n>]");
+ printd = 1;
+ if (*v == NULL)
+ dp = dcwd;
+ else if (v[1] != NULL) {
+ stderror(ERR_NAME | ERR_TOOMANY);
+ /* NOTREACHED */
+ return;
+ }
+ else if ((dp = dfind(*v)) == 0)
+ stderror(ERR_NAME | ERR_BADDIR);
+ if (dp->di_prev == &dhead && dp->di_next == &dhead)
+ stderror(ERR_NAME | ERR_EMPTY);
+ if (dp == dcwd) {
+ char *tmp;
+
+ if ((p = dp->di_prev) == &dhead)
+ p = dhead.di_prev;
+ if (chdir(tmp = short2str(p->di_name)) < 0)
+ stderror(ERR_SYSTEM, tmp, strerror(errno));
+ }
+ dp->di_prev->di_next = dp->di_next;
+ dp->di_next->di_prev = dp->di_prev;
+ if (dp == dcwd)
+ dnewcwd(p);
+ else {
+ printdirs();
+ }
+ dfree(dp);
+}
+
+/*
+ * dfree - free the directory (or keep it if it still has ref count)
+ */
+void
+dfree(dp)
+ register struct directory *dp;
+{
+
+ if (dp->di_count != 0) {
+ dp->di_next = dp->di_prev = 0;
+ }
+ else {
+ xfree((char *) dp->di_name);
+ xfree((ptr_t) dp);
+ }
+}
+
+/*
+ * dcanon - canonicalize the pathname, removing excess ./ and ../ etc.
+ * we are of course assuming that the file system is standardly
+ * constructed (always have ..'s, directories have links)
+ */
+Char *
+dcanon(cp, p)
+ register Char *cp, *p;
+{
+ register Char *sp;
+ register Char *p1, *p2; /* general purpose */
+ bool slash;
+
+ Char link[MAXPATHLEN];
+ char tlink[MAXPATHLEN];
+ int cc;
+ Char *newcp;
+
+ /*
+ * christos: if the path given does not start with a slash prepend cwd. If
+ * cwd does not start with a path or the result would be too long abort().
+ */
+ if (*cp != '/') {
+ Char tmpdir[MAXPATHLEN];
+
+ p1 = value(STRcwd);
+ if (p1 == NULL || *p1 != '/')
+ abort();
+ if (Strlen(p1) + Strlen(cp) + 1 >= MAXPATHLEN)
+ abort();
+ (void) Strcpy(tmpdir, p1);
+ (void) Strcat(tmpdir, STRslash);
+ (void) Strcat(tmpdir, cp);
+ xfree((ptr_t) cp);
+ cp = p = Strsave(tmpdir);
+ }
+
+ while (*p) { /* for each component */
+ sp = p; /* save slash address */
+ while (*++p == '/') /* flush extra slashes */
+ continue;
+ if (p != ++sp)
+ for (p1 = sp, p2 = p; (*p1++ = *p2++) != '\0';)
+ continue;
+ p = sp; /* save start of component */
+ slash = 0;
+ while (*++p) /* find next slash or end of path */
+ if (*p == '/') {
+ slash = 1;
+ *p = 0;
+ break;
+ }
+
+ if (*sp == '\0') /* if component is null */
+ if (--sp == cp) /* if path is one char (i.e. /) */
+ break;
+ else
+ *sp = '\0';
+ else if (sp[0] == '.' && sp[1] == 0) {
+ if (slash) {
+ for (p1 = sp, p2 = p + 1; (*p1++ = *p2++) != '\0';)
+ continue;
+ p = --sp;
+ }
+ else if (--sp != cp)
+ *sp = '\0';
+ }
+ else if (sp[0] == '.' && sp[1] == '.' && sp[2] == 0) {
+ /*
+ * We have something like "yyy/xxx/..", where "yyy" can be null or
+ * a path starting at /, and "xxx" is a single component. Before
+ * compressing "xxx/..", we want to expand "yyy/xxx", if it is a
+ * symbolic link.
+ */
+ *--sp = 0; /* form the pathname for readlink */
+ if (sp != cp && !adrof(STRignore_symlinks) &&
+ (cc = readlink(short2str(cp), tlink,
+ sizeof tlink)) >= 0) {
+ (void) Strcpy(link, str2short(tlink));
+ link[cc] = '\0';
+
+ if (slash)
+ *p = '/';
+ /*
+ * Point p to the '/' in "/..", and restore the '/'.
+ */
+ *(p = sp) = '/';
+ /*
+ * find length of p
+ */
+ for (p1 = p; *p1++;)
+ continue;
+ if (*link != '/') {
+ /*
+ * Relative path, expand it between the "yyy/" and the
+ * "/..". First, back sp up to the character past "yyy/".
+ */
+ while (*--sp != '/')
+ continue;
+ sp++;
+ *sp = 0;
+ /*
+ * New length is "yyy/" + link + "/.." and rest
+ */
+ p1 = newcp = (Char *) xmalloc((size_t)
+ (((sp - cp) + cc + (p1 - p)) *
+ sizeof(Char)));
+ /*
+ * Copy new path into newcp
+ */
+ for (p2 = cp; (*p1++ = *p2++) != '\0';)
+ continue;
+ for (p1--, p2 = link; (*p1++ = *p2++) != '\0';)
+ continue;
+ for (p1--, p2 = p; (*p1++ = *p2++) != '\0';)
+ continue;
+ /*
+ * Restart canonicalization at expanded "/xxx".
+ */
+ p = sp - cp - 1 + newcp;
+ }
+ else {
+ /*
+ * New length is link + "/.." and rest
+ */
+ p1 = newcp = (Char *) xmalloc((size_t)
+ ((cc + (p1 - p)) * sizeof(Char)));
+ /*
+ * Copy new path into newcp
+ */
+ for (p2 = link; (*p1++ = *p2++) != '\0';)
+ continue;
+ for (p1--, p2 = p; (*p1++ = *p2++) != '\0';)
+ continue;
+ /*
+ * Restart canonicalization at beginning
+ */
+ p = newcp;
+ }
+ xfree((ptr_t) cp);
+ cp = newcp;
+ continue; /* canonicalize the link */
+ }
+ *sp = '/';
+ if (sp != cp)
+ while (*--sp != '/')
+ continue;
+ if (slash) {
+ for (p1 = sp + 1, p2 = p + 1; (*p1++ = *p2++) != '\0';)
+ continue;
+ p = sp;
+ }
+ else if (cp == sp)
+ *++sp = '\0';
+ else
+ *sp = '\0';
+ }
+ else { /* normal dir name (not . or .. or nothing) */
+
+ if (sp != cp && adrof(STRchase_symlinks) &&
+ !adrof(STRignore_symlinks) &&
+ (cc = readlink(short2str(cp), tlink,
+ sizeof tlink)) >= 0) {
+ (void) Strcpy(link, str2short(tlink));
+ link[cc] = '\0';
+
+ /*
+ * restore the '/'.
+ */
+ if (slash)
+ *p = '/';
+
+ /*
+ * point sp to p (rather than backing up).
+ */
+ sp = p;
+
+ /*
+ * find length of p
+ */
+ for (p1 = p; *p1++;)
+ continue;
+ if (*link != '/') {
+ /*
+ * Relative path, expand it between the "yyy/" and the
+ * remainder. First, back sp up to the character past
+ * "yyy/".
+ */
+ while (*--sp != '/')
+ continue;
+ sp++;
+ *sp = 0;
+ /*
+ * New length is "yyy/" + link + "/.." and rest
+ */
+ p1 = newcp = (Char *) xmalloc((size_t)
+ (((sp - cp) + cc + (p1 - p))
+ * sizeof(Char)));
+ /*
+ * Copy new path into newcp
+ */
+ for (p2 = cp; (*p1++ = *p2++) != '\0';)
+ continue;
+ for (p1--, p2 = link; (*p1++ = *p2++) != '\0';)
+ continue;
+ for (p1--, p2 = p; (*p1++ = *p2++) != '\0';)
+ continue;
+ /*
+ * Restart canonicalization at expanded "/xxx".
+ */
+ p = sp - cp - 1 + newcp;
+ }
+ else {
+ /*
+ * New length is link + the rest
+ */
+ p1 = newcp = (Char *) xmalloc((size_t)
+ ((cc + (p1 - p)) * sizeof(Char)));
+ /*
+ * Copy new path into newcp
+ */
+ for (p2 = link; (*p1++ = *p2++) != '\0';)
+ continue;
+ for (p1--, p2 = p; (*p1++ = *p2++) != '\0';)
+ continue;
+ /*
+ * Restart canonicalization at beginning
+ */
+ p = newcp;
+ }
+ xfree((ptr_t) cp);
+ cp = newcp;
+ continue; /* canonicalize the link */
+ }
+ if (slash)
+ *p = '/';
+ }
+ }
+
+ /*
+ * fix home...
+ */
+ p1 = value(STRhome);
+ cc = Strlen(p1);
+ /*
+ * See if we're not in a subdir of STRhome
+ */
+ if (p1 && *p1 == '/' &&
+ (Strncmp(p1, cp, cc) != 0 || (cp[cc] != '/' && cp[cc] != '\0'))) {
+ static ino_t home_ino = -1;
+ static dev_t home_dev = -1;
+ static Char *home_ptr = NULL;
+ struct stat statbuf;
+
+ /*
+ * Get dev and ino of STRhome
+ */
+ if (home_ptr != p1 &&
+ stat(short2str(p1), &statbuf) != -1) {
+ home_dev = statbuf.st_dev;
+ home_ino = statbuf.st_ino;
+ home_ptr = p1;
+ }
+ /*
+ * Start comparing dev & ino backwards
+ */
+ p2 = Strcpy(link, cp);
+ for (sp = NULL; *p2 && stat(short2str(p2), &statbuf) != -1;) {
+ if (statbuf.st_dev == home_dev &&
+ statbuf.st_ino == home_ino) {
+ sp = (Char *) - 1;
+ break;
+ }
+ if ((sp = Strrchr(p2, '/')) != NULL)
+ *sp = '\0';
+ }
+ /*
+ * See if we found it
+ */
+ if (*p2 && sp == (Char *) -1) {
+ /*
+ * Use STRhome to make '~' work
+ */
+ newcp = Strspl(p1, cp + Strlen(p2));
+ xfree((ptr_t) cp);
+ cp = newcp;
+ }
+ }
+ return cp;
+}
+
+
+/*
+ * dnewcwd - make a new directory in the loop the current one
+ */
+static void
+dnewcwd(dp)
+ register struct directory *dp;
+{
+ dcwd = dp;
+ dset(dcwd->di_name);
+ if (printd && !(adrof(STRpushdsilent)))
+ printdirs();
+}
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