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freebsd/contrib/tcsh/sh.dir.c
Mark Peek 2930157267 Import of tcsh-6.12.00
2002-07-24 16:23:10 +00:00

1406 lines
33 KiB
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/* $Header: /src/pub/tcsh/sh.dir.c,v 3.60 2002/07/08 21:03:04 christos Exp $ */
/*
* sh.dir.c: Directory manipulation functions
*/
/*-
* Copyright (c) 1980, 1991 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. 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 "sh.h"
RCSID("$Id: sh.dir.c,v 3.60 2002/07/08 21:03:04 christos Exp $")
/*
* C Shell - directory management
*/
static void dstart __P((const char *));
static struct directory *dfind __P((Char *));
static Char *dfollow __P((Char *));
static void printdirs __P((int));
static Char *dgoto __P((Char *));
static void dnewcwd __P((struct directory *, int));
static void dset __P((Char *));
static void dextract __P((struct directory *));
static int skipargs __P((Char ***, char *, char *));
static void dgetstack __P((void));
static struct directory dhead INIT_ZERO_STRUCT; /* "head" of loop */
static int printd; /* force name to be printed */
int bequiet = 0; /* do not print dir stack -strike */
static void
dstart(from)
const char *from;
{
xprintf(CGETS(12, 1, "%s: Trying to start from \"%s\"\n"), progname, from);
}
/*
* dinit - initialize current working directory
*/
void
dinit(hp)
Char *hp;
{
register char *tcp;
register Char *cp;
register struct directory *dp;
char path[MAXPATHLEN];
/* Don't believe the login shell home, because it may be a symlink */
tcp = (char *) getcwd(path, sizeof(path));
if (tcp == NULL || *tcp == '\0') {
xprintf("%s: %s\n", progname, strerror(errno));
if (hp && *hp) {
tcp = short2str(hp);
dstart(tcp);
if (chdir(tcp) == -1)
cp = NULL;
else
cp = Strsave(hp);
}
else
cp = NULL;
if (cp == NULL) {
dstart("/");
if (chdir("/") == -1)
/* I am not even try to print an error message! */
xexit(1);
cp = SAVE("/");
}
}
else {
#ifdef S_IFLNK
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 &&
DEV_DEV_COMPARE(swd.st_dev, shp.st_dev) &&
swd.st_ino == shp.st_ino)
cp = Strsave(hp);
else {
char *cwd;
/*
* use PWD if we have it (for subshells)
*/
if ((cwd = getenv("PWD")) != NULL) {
if (stat(cwd, &shp) != -1 &&
DEV_DEV_COMPARE(swd.st_dev, shp.st_dev) &&
swd.st_ino == shp.st_ino)
tcp = cwd;
}
cp = dcanon(SAVE(tcp), STRNULL);
}
#else /* S_IFLNK */
cp = dcanon(SAVE(tcp), STRNULL);
#endif /* S_IFLNK */
}
dp = (struct directory *) xcalloc(sizeof(struct directory), 1);
dp->di_name = cp;
dp->di_count = 0;
dhead.di_next = dhead.di_prev = dp;
dp->di_next = dp->di_prev = &dhead;
printd = 0;
dnewcwd(dp, 0);
set(STRdirstack, Strsave(dp->di_name), VAR_READWRITE|VAR_NOGLOB);
}
static void
dset(dp)
Char *dp;
{
/*
* Don't call set() directly cause if the directory contains ` or
* other junk characters glob will fail.
*/
set(STRowd, Strsave(varval(STRcwd)), VAR_READWRITE|VAR_NOGLOB);
set(STRcwd, Strsave(dp), VAR_READWRITE|VAR_NOGLOB);
tsetenv(STRPWD, dp);
}
#define DIR_PRINT 0x01 /* -p */
#define DIR_LONG 0x02 /* -l */
#define DIR_VERT 0x04 /* -v */
#define DIR_LINE 0x08 /* -n */
#define DIR_SAVE 0x10 /* -S */
#define DIR_LOAD 0x20 /* -L */
#define DIR_CLEAR 0x40 /* -c */
#define DIR_OLD 0x80 /* - */
static int
skipargs(v, dstr, str)
Char ***v;
char *dstr;
char *str;
{
Char **n = *v, *s;
int dflag = 0, loop = 1;
for (n++; loop && *n != NULL && (*n)[0] == '-'; n++)
if (*(s = &((*n)[1])) == '\0') /* test for bare "-" argument */
dflag |= DIR_OLD;
else {
char *p;
while (loop && *s != '\0') /* examine flags */
{
if ((p = strchr(dstr, *s++)) != NULL)
dflag |= (1 << (p - dstr));
else {
stderror(ERR_DIRUS, short2str(**v), dstr, str);
loop = 0; /* break from both loops */
break;
}
}
}
if (*n && (dflag & DIR_OLD))
stderror(ERR_DIRUS, short2str(**v), dstr, str);
*v = n;
/* make -l, -v, and -n imply -p */
if (dflag & (DIR_LONG|DIR_VERT|DIR_LINE))
dflag |= DIR_PRINT;
return dflag;
}
/*
* dodirs - list all directories in directory loop
*/
/*ARGSUSED*/
void
dodirs(v, c)
Char **v;
struct command *c;
{
static char flags[] = "plvnSLc";
int dflag = skipargs(&v, flags, "");
USE(c);
if ((dflag & DIR_CLEAR) != 0) {
struct directory *dp, *fdp;
for (dp = dcwd->di_next; dp != dcwd; ) {
fdp = dp;
dp = dp->di_next;
if (fdp != &dhead)
dfree(fdp);
}
dhead.di_next = dhead.di_prev = dp;
dp->di_next = dp->di_prev = &dhead;
}
if ((dflag & DIR_LOAD) != 0)
loaddirs(*v);
else if ((dflag & DIR_SAVE) != 0)
recdirs(*v, 1);
if (*v && (dflag & (DIR_SAVE|DIR_LOAD)))
v++;
if (*v != NULL || (dflag & DIR_OLD))
stderror(ERR_DIRUS, "dirs", flags, "");
if ((dflag & (DIR_CLEAR|DIR_LOAD|DIR_SAVE)) == 0 || (dflag & DIR_PRINT))
printdirs(dflag);
}
static void
printdirs(dflag)
int dflag;
{
register struct directory *dp;
Char *s, *user;
int idx, len, cur;
extern int T_Cols;
dp = dcwd;
idx = 0;
cur = 0;
do {
if (dp == &dhead)
continue;
if (dflag & DIR_VERT) {
xprintf("%d\t", idx++);
cur = 0;
}
s = dp->di_name;
user = NULL;
if (!(dflag & DIR_LONG) && (user = getusername(&s)) != NULL)
len = (int) (Strlen(user) + Strlen(s) + 2);
else
len = (int) (Strlen(s) + 1);
cur += len;
if ((dflag & DIR_LINE) && cur >= T_Cols - 1 && len < T_Cols) {
xputchar('\n');
cur = len;
}
if (user)
xprintf("~%S", user);
xprintf("%S%c", s, (dflag & DIR_VERT) ? '\n' : ' ');
} while ((dp = dp->di_prev) != dcwd);
if (!(dflag & DIR_VERT))
xputchar('\n');
}
void
dtildepr(dir)
Char *dir;
{
Char* user;
if ((user = getusername(&dir)) != NULL)
xprintf("~%S%S", user, dir);
else
xprintf("%S", 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():
* The path will be normalized if it
* 1) is "..",
* 2) or starts with "../",
* 3) or ends with "/..",
* 4) or contains the string "/../",
* then it will be normalized, unless those strings are quoted.
* Otherwise, a copy is made and sent back.
*/
Char *
dnormalize(cp, exp)
Char *cp;
int exp;
{
/* return true if dp is of the form "../xxx" or "/../xxx" */
#define IS_DOTDOT(sp, p) (ISDOTDOT(p) && ((p) == (sp) || *((p) - 1) == '/'))
#define IS_DOT(sp, p) (ISDOT(p) && ((p) == (sp) || *((p) - 1) == '/'))
#ifdef S_IFLNK
if (exp) {
int dotdot = 0;
Char *dp, *cwd, *start = cp, buf[MAXPATHLEN];
struct stat sb;
# ifdef apollo
bool slashslash;
# endif /* apollo */
/*
* count the number of "../xxx" or "xxx/../xxx" in the path
*/
for (dp=start; *dp && *(dp+1); dp++)
if (IS_DOTDOT(start, dp))
dotdot++;
/*
* if none, we are done.
*/
if (dotdot == 0)
return (Strsave(cp));
/*
* If the path doesn't exist, we are done too.
*/
if (lstat(short2str(cp), &sb) != 0 && errno == ENOENT)
return (Strsave(cp));
cwd = (Char *) xmalloc((size_t) (((int) Strlen(dcwd->di_name) + 3) *
sizeof(Char)));
(void) Strcpy(cwd, dcwd->di_name);
/*
* If the path starts with a slash, we are not relative to
* the current working directory.
*/
if (ABSOLUTEP(start))
*cwd = '\0';
# ifdef apollo
slashslash = cwd[0] == '/' && cwd[1] == '/';
# endif /* apollo */
/*
* Ignore . and count ..'s
*/
for (;;) {
dotdot = 0;
buf[0] = '\0';
dp = buf;
while (*cp)
if (IS_DOT(start, cp)) {
if (*++cp)
cp++;
}
else if (IS_DOTDOT(start, cp)) {
if (buf[0])
break; /* finish analyzing .././../xxx/[..] */
dotdot++;
cp += 2;
if (*cp)
cp++;
}
else
*dp++ = *cp++;
*dp = '\0';
while (dotdot > 0)
if ((dp = Strrchr(cwd, '/')) != NULL) {
# ifdef apollo
if (dp == &cwd[1])
slashslash = 1;
# endif /* apollo */
*dp = '\0';
dotdot--;
}
else
break;
if (!*cwd) { /* too many ..'s, starts with "/" */
cwd[0] = '/';
# ifdef apollo
cwd[1] = '/';
cwd[2] = '\0';
# else /* !apollo */
cwd[1] = '\0';
# endif /* apollo */
}
# ifdef apollo
else if (slashslash && cwd[1] == '\0') {
cwd[1] = '/';
cwd[2] = '\0';
}
# endif /* apollo */
if (buf[0]) {
if ((TRM(cwd[(dotdot = (int) Strlen(cwd)) - 1])) != '/')
cwd[dotdot++] = '/';
cwd[dotdot] = '\0';
dp = Strspl(cwd, TRM(buf[0]) == '/' ? &buf[1] : buf);
xfree((ptr_t) cwd);
cwd = dp;
if ((TRM(cwd[(dotdot = (int) Strlen(cwd)) - 1])) == '/')
cwd[--dotdot] = '\0';
}
/* Reduction of ".." following the stuff we collected in buf
* only makes sense if the directory item in buf really exists.
* Avoid reduction of "-I../.." (typical compiler call) to ""
* or "/usr/nonexistant/../bin" to "/usr/bin":
*/
if (cwd[0]) {
struct stat exists;
if (0 != stat(short2str(cwd), &exists)) {
xfree((ptr_t) cwd);
return Strsave(start);
}
}
if (!*cp)
break;
}
return cwd;
}
#endif /* S_IFLNK */
return Strsave(cp);
}
/*
* dochngd - implement chdir command.
*/
/*ARGSUSED*/
void
dochngd(v, c)
Char **v;
struct command *c;
{
register Char *cp;
register struct directory *dp;
int dflag = skipargs(&v, "plvn", "[-|<dir>]");
USE(c);
printd = 0;
cp = (dflag & DIR_OLD) ? varval(STRowd) : *v;
if (cp == NULL) {
if ((cp = varval(STRhome)) == STRNULL || *cp == 0)
stderror(ERR_NAME | ERR_NOHOMEDIR);
if (chdir(short2str(cp)) < 0)
stderror(ERR_NAME | ERR_CANTCHANGE);
cp = Strsave(cp);
}
else if ((dflag & DIR_OLD) == 0 && v[1] != NULL) {
stderror(ERR_NAME | ERR_TOOMANY);
/* NOTREACHED */
return;
}
else if ((dp = dfind(cp)) != 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, dflag);
return;
}
else
if ((cp = dfollow(cp)) == NULL)
return;
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, dflag);
}
static Char *
dgoto(cp)
Char *cp;
{
Char *dp;
if (!ABSOLUTEP(cp))
{
register Char *p, *q;
int cwdlen;
for (p = dcwd->di_name; *p++;)
continue;
if ((cwdlen = (int) (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;
#ifdef WINNT_NATIVE
cp = SAVE(getcwd(NULL, 0));
#else /* !WINNT_NATIVE */
cp = dcanon(cp, dp);
#endif /* WINNT_NATIVE */
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);
#ifdef apollo
if (Strchr(cp, '`')) {
char *dptr, *ptr;
if (chdir(dptr = short2str(cp)) < 0)
stderror(ERR_SYSTEM, dptr, strerror(errno));
else if ((ptr = getcwd(ebuf, sizeof(ebuf))) && *ptr != '\0') {
xfree((ptr_t) cp);
cp = Strsave(str2short(ptr));
return dgoto(cp);
}
else
stderror(ERR_SYSTEM, dptr, ebuf);
}
#endif /* apollo */
(void) strncpy(ebuf, short2str(cp), MAXPATHLEN);
ebuf[MAXPATHLEN-1] = '\0';
/*
* if we are ignoring symlinks, try to fix relatives now.
* if we are expading symlinks, it should be done by now.
*/
dp = dnormalize(cp, symlinks == SYM_IGNORE);
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);
else if (errno != ENOENT && errno != ENOTDIR)
stderror(ERR_SYSTEM, ebuf, strerror(errno));
serrno = errno;
}
if (cp[0] != '/' && !prefix(STRdotsl, cp) && !prefix(STRdotdotsl, cp)
&& (c = adrof(STRcdpath)) && c->vec != NULL) {
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;
/*
* We always want to fix the directory here
* If we are normalizing symlinks
*/
dp = dnormalize(buf, symlinks == SYM_IGNORE ||
symlinks == SYM_EXPAND);
if (chdir(short2str(dp)) >= 0) {
printd = 1;
xfree((ptr_t) cp);
return dgoto(dp);
}
else if (chdir(short2str(cp)) >= 0) {
printd = 1;
xfree((ptr_t) dp);
return dgoto(cp);
}
}
}
dp = varval(cp);
if ((dp[0] == '/' || dp[0] == '.') && chdir(short2str(dp)) >= 0) {
xfree((ptr_t) cp);
cp = Strsave(dp);
printd = 1;
return dgoto(cp);
}
xfree((ptr_t) cp);
/*
* on login source of ~/.cshdirs, errors are eaten. the dir stack is all
* directories we could get to.
*/
if (!bequiet) {
stderror(ERR_SYSTEM, ebuf, strerror(serrno));
return (NULL);
}
else
return (NULL);
}
/*
* dopushd - push new directory onto directory stack.
* with no arguments exchange top and second.
* with numeric argument (+n) bring it to top.
*/
/*ARGSUSED*/
void
dopushd(v, c)
Char **v;
struct command *c;
{
register struct directory *dp;
register Char *cp;
int dflag = skipargs(&v, "plvn", " [-|<dir>|+<n>]");
USE(c);
printd = 1;
cp = (dflag & DIR_OLD) ? varval(STRowd) : *v;
if (cp == NULL) {
if (adrof(STRpushdtohome)) {
if ((cp = varval(STRhome)) == STRNULL || *cp == 0)
stderror(ERR_NAME | ERR_NOHOMEDIR);
if (chdir(short2str(cp)) < 0)
stderror(ERR_NAME | ERR_CANTCHANGE);
cp = Strsave(cp); /* hmmm... PWP */
if ((cp = dfollow(cp)) == NULL)
return;
dp = (struct directory *) xcalloc(sizeof(struct directory), 1);
dp->di_name = cp;
dp->di_count = 0;
dp->di_prev = dcwd;
dp->di_next = dcwd->di_next;
dcwd->di_next = dp;
dp->di_next->di_prev = dp;
}
else {
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 ((dflag & DIR_OLD) == 0 && v[1] != NULL) {
stderror(ERR_NAME | ERR_TOOMANY);
/* NOTREACHED */
return;
}
else if ((dp = dfind(cp)) != NULL) {
char *tmp;
if (chdir(tmp = short2str(dp->di_name)) < 0)
stderror(ERR_SYSTEM, tmp, strerror(errno));
/*
* kfk - 10 Feb 1984 - added new "extraction style" pushd +n
*/
if (adrof(STRdextract))
dextract(dp);
}
else {
register Char *ccp;
if ((ccp = dfollow(cp)) == NULL)
return;
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, dflag);
}
/*
* 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.
*/
/*ARGSUSED*/
void
dopopd(v, c)
Char **v;
struct command *c;
{
Char *cp;
register struct directory *dp, *p = NULL;
int dflag = skipargs(&v, "plvn", " [-|+<n>]");
USE(c);
printd = 1;
cp = (dflag & DIR_OLD) ? varval(STRowd) : *v;
if (cp == NULL)
dp = dcwd;
else if ((dflag & DIR_OLD) == 0 && v[1] != NULL) {
stderror(ERR_NAME | ERR_TOOMANY);
/* NOTREACHED */
return;
}
else if ((dp = dfind(cp)) == 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, dflag);
}
else {
printdirs(dflag);
}
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((ptr_t) 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;
#ifdef apollo
bool slashslash;
#endif /* apollo */
size_t clen;
#ifdef S_IFLNK /* if we have symlinks */
Char link[MAXPATHLEN];
char tlink[MAXPATHLEN];
int cc;
Char *newcp;
#endif /* S_IFLNK */
/*
* if the path given is too long truncate it!
*/
if ((clen = Strlen(cp)) >= MAXPATHLEN)
cp[clen = MAXPATHLEN - 1] = '\0';
/*
* christos: if the path given does not start with a slash prepend cwd. If
* cwd does not start with a slash or the result would be too long try to
* correct it.
*/
if (!ABSOLUTEP(cp)) {
Char tmpdir[MAXPATHLEN];
size_t len;
p1 = varval(STRcwd);
if (p1 == STRNULL || !ABSOLUTEP(p1)) {
char *tmp = (char *)getcwd((char *)tmpdir, sizeof(tmpdir));
if (tmp == NULL || *tmp == '\0') {
xprintf("%s: %s\n", progname, strerror(errno));
set(STRcwd, SAVE("/"), VAR_READWRITE|VAR_NOGLOB);
} else {
set(STRcwd, SAVE(tmp), VAR_READWRITE|VAR_NOGLOB);
}
p1 = varval(STRcwd);
}
len = Strlen(p1);
if (len + clen + 1 >= MAXPATHLEN)
cp[MAXPATHLEN - (len + 1)] = '\0';
(void) Strcpy(tmpdir, p1);
(void) Strcat(tmpdir, STRslash);
(void) Strcat(tmpdir, cp);
xfree((ptr_t) cp);
cp = p = Strsave(tmpdir);
}
#ifdef apollo
slashslash = (cp[0] == '/' && cp[1] == '/');
#endif /* apollo */
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;
if (*p)
while (*++p) /* find next slash or end of path */
if (*p == '/') {
slash = 1;
*p = 0;
break;
}
#ifdef apollo
if (&cp[1] == sp && sp[0] == '.' && sp[1] == '.' && sp[2] == '\0')
slashslash = 1;
#endif /* apollo */
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
sp[1] = '\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 */
#ifdef S_IFLNK /* if we have symlinks */
if (sp != cp && /* symlinks != SYM_IGNORE && */
(cc = readlink(short2str(cp), tlink,
sizeof tlink)) >= 0) {
tlink[cc] = '\0';
(void) Strncpy(link, str2short(tlink),
sizeof(link) / sizeof(Char));
link[sizeof(link) / sizeof(Char) - 1] = '\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;
#ifdef apollo
slashslash = (cp[0] == '/' && cp[1] == '/');
#endif /* apollo */
continue; /* canonicalize the link */
}
#endif /* S_IFLNK */
*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) */
#ifdef S_IFLNK /* if we have symlinks */
if (sp != cp && symlinks == SYM_CHASE &&
(cc = readlink(short2str(cp), tlink,
sizeof tlink)) >= 0) {
tlink[cc] = '\0';
(void) Strncpy(link, str2short(tlink),
sizeof(link) / sizeof(Char));
link[sizeof(link) / sizeof(Char) - 1] = '\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;
#ifdef apollo
slashslash = (cp[0] == '/' && cp[1] == '/');
#endif /* apollo */
continue; /* canonicalize the link */
}
#endif /* S_IFLNK */
if (slash)
*p = '/';
}
}
/*
* fix home...
*/
#ifdef S_IFLNK
p1 = varval(STRhome);
cc = (int) Strlen(p1);
/*
* See if we're not in a subdir of STRhome
*/
if (p1 && *p1 == '/' && (Strncmp(p1, cp, (size_t) cc) != 0 ||
(cp[cc] != '/' && cp[cc] != '\0'))) {
static ino_t home_ino = (ino_t) -1;
static dev_t home_dev = (dev_t) -1;
static Char *home_ptr = NULL;
struct stat statbuf;
int found;
/*
* 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 = Strncpy(link, cp, sizeof(link) / sizeof(Char));
link[sizeof(link) / sizeof(Char) - 1] = '\0';
found = 0;
while (*p2 && stat(short2str(p2), &statbuf) != -1) {
if (DEV_DEV_COMPARE(statbuf.st_dev, home_dev) &&
statbuf.st_ino == home_ino) {
found = 1;
break;
}
if ((sp = Strrchr(p2, '/')) != NULL)
*sp = '\0';
}
/*
* See if we found it
*/
if (*p2 && found) {
/*
* Use STRhome to make '~' work
*/
newcp = Strspl(p1, cp + Strlen(p2));
xfree((ptr_t) cp);
cp = newcp;
}
}
#endif /* S_IFLNK */
#ifdef apollo
if (slashslash) {
if (cp[1] != '/') {
p = (Char *) xmalloc((size_t) (Strlen(cp) + 2) * sizeof(Char));
*p = '/';
(void) Strcpy(&p[1], cp);
xfree((ptr_t) cp);
cp = p;
}
}
if (cp[1] == '/' && cp[2] == '/')
(void) Strcpy(&cp[1], &cp[2]);
#endif /* apollo */
return cp;
}
/*
* dnewcwd - make a new directory in the loop the current one
*/
static void
dnewcwd(dp, dflag)
register struct directory *dp;
int dflag;
{
int print;
if (adrof(STRdunique)) {
struct directory *dn;
for (dn = dhead.di_prev; dn != &dhead; dn = dn->di_prev)
if (dn != dp && Strcmp(dn->di_name, dp->di_name) == 0) {
dn->di_next->di_prev = dn->di_prev;
dn->di_prev->di_next = dn->di_next;
dfree(dn);
break;
}
}
dcwd = dp;
dset(dcwd->di_name);
dgetstack();
print = printd; /* if printd is set, print dirstack... */
if (adrof(STRpushdsilent)) /* but pushdsilent overrides printd... */
print = 0;
if (dflag & DIR_PRINT) /* but DIR_PRINT overrides pushdsilent... */
print = 1;
if (bequiet) /* and bequiet overrides everything */
print = 0;
if (print)
printdirs(dflag);
cwd_cmd(); /* PWP: run the defined cwd command */
}
void
dsetstack()
{
Char **cp;
struct varent *vp;
struct directory *dn, *dp;
if ((vp = adrof(STRdirstack)) == NULL || vp->vec == NULL)
return;
/* Free the whole stack */
while ((dn = dhead.di_prev) != &dhead) {
dn->di_next->di_prev = dn->di_prev;
dn->di_prev->di_next = dn->di_next;
if (dn != dcwd)
dfree(dn);
}
/* thread the current working directory */
dhead.di_prev = dhead.di_next = dcwd;
dcwd->di_next = dcwd->di_prev = &dhead;
/* put back the stack */
for (cp = vp->vec; cp && *cp && **cp; cp++) {
dp = (struct directory *) xcalloc(sizeof(struct directory), 1);
dp->di_name = Strsave(*cp);
dp->di_count = 0;
dp->di_prev = dcwd;
dp->di_next = dcwd->di_next;
dcwd->di_next = dp;
dp->di_next->di_prev = dp;
}
dgetstack(); /* Make $dirstack reflect the current state */
}
static void
dgetstack()
{
int i = 0;
Char **dblk, **dbp;
struct directory *dn;
if (adrof(STRdirstack) == NULL)
return;
for (dn = dhead.di_prev; dn != &dhead; dn = dn->di_prev, i++)
continue;
dbp = dblk = (Char**) xmalloc((size_t) (i + 1) * sizeof(Char *));
for (dn = dhead.di_prev; dn != &dhead; dn = dn->di_prev, dbp++)
*dbp = Strsave(dn->di_name);
*dbp = NULL;
setq(STRdirstack, dblk, &shvhed, VAR_READWRITE);
}
/*
* getstakd - added by kfk 17 Jan 1984
* Support routine for the stack hack. Finds nth directory in
* the directory stack, or finds last directory in stack.
*/
int
getstakd(s, cnt)
Char *s;
int cnt;
{
struct directory *dp;
dp = dcwd;
if (cnt < 0) { /* < 0 ==> last dir requested. */
dp = dp->di_next;
if (dp == &dhead)
dp = dp->di_next;
}
else {
while (cnt-- > 0) {
dp = dp->di_prev;
if (dp == &dhead)
dp = dp->di_prev;
if (dp == dcwd)
return (0);
}
}
(void) Strncpy(s, dp->di_name, BUFSIZE);
s[BUFSIZE - 1] = '\0';
return (1);
}
/*
* Karl Kleinpaste - 10 Feb 1984
* Added dextract(), which is used in pushd +n.
* Instead of just rotating the entire stack around, dextract()
* lets the user have the nth dir extracted from its current
* position, and pushes it onto the top.
*/
static void
dextract(dp)
struct directory *dp;
{
if (dp == dcwd)
return;
dp->di_next->di_prev = dp->di_prev;
dp->di_prev->di_next = dp->di_next;
dp->di_next = dcwd->di_next;
dp->di_prev = dcwd;
dp->di_next->di_prev = dp;
dcwd->di_next = dp;
}
void
loaddirs(fname)
Char *fname;
{
static Char *loaddirs_cmd[] = { STRsource, NULL, NULL };
bequiet = 1;
if (fname)
loaddirs_cmd[1] = fname;
else if ((fname = varval(STRdirsfile)) != STRNULL)
loaddirs_cmd[1] = fname;
else
loaddirs_cmd[1] = STRtildotdirs;
dosource(loaddirs_cmd, (struct command *)0);
bequiet = 0;
}
/*
* create a file called ~/.cshdirs which has a sequence
* of pushd commands which will restore the dir stack to
* its state before exit/logout. remember that the order
* is reversed in the file because we are pushing.
* -strike
*/
void
recdirs(fname, def)
Char *fname;
int def;
{
int fp, ftmp, oldidfds;
int cdflag = 0;
extern struct directory *dcwd;
struct directory *dp;
unsigned int num;
Char *snum;
Char qname[MAXPATHLEN*2];
if (fname == NULL && !def)
return;
if (fname == NULL) {
if ((fname = varval(STRdirsfile)) == STRNULL)
fname = Strspl(varval(STRhome), &STRtildotdirs[1]);
else
fname = Strsave(fname);
}
else
fname = globone(fname, G_ERROR);
if ((fp = creat(short2str(fname), 0600)) == -1) {
xfree((ptr_t) fname);
return;
}
if ((snum = varval(STRsavedirs)) == STRNULL || snum[0] == '\0')
num = (unsigned int) ~0;
else
num = (unsigned int) atoi(short2str(snum));
oldidfds = didfds;
didfds = 0;
ftmp = SHOUT;
SHOUT = fp;
dp = dcwd->di_next;
do {
if (dp == &dhead)
continue;
if (cdflag == 0) {
cdflag = 1;
xprintf("cd %S\n", quote_meta(qname, dp->di_name));
}
else
xprintf("pushd %S\n", quote_meta(qname, dp->di_name));
if (num-- == 0)
break;
} while ((dp = dp->di_next) != dcwd->di_next);
(void) close(fp);
SHOUT = ftmp;
didfds = oldidfds;
xfree((ptr_t) fname);
}
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