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Split updatepwd() into two smaller functions. The first one, findpwd(),

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computes the new path and the second one, updatepwd(), updates the variables
PWD, OLDPWD and the path used for the pwd builtin according to the new
directory.  For a logical directory change, chdir() is now called between
those two functions, no longer causing wrong values to be stored in PWD etc. if
it fails.

PR:	64990, 101316, 120571
This commit is contained in:
Stefan Farfeleder 2008-02-24 16:50:55 +00:00
parent 628f51d275
commit 55d2c5b573
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=176521
1 changed files with 45 additions and 38 deletions
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83
bin/sh/cd.c
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@ -68,7 +68,9 @@ STATIC int cdlogical(char *);
STATIC int cdphysical(char *);
STATIC int docd(char *, int, int);
STATIC char *getcomponent(void);
STATIC int updatepwd(char *);
STATIC char *findcwd(char *);
STATIC void updatepwd(char *);
STATIC char *getpwd2(char *, size_t);
STATIC char *curdir = NULL; /* current working directory */
STATIC char *prevdir; /* previous working directory */
@ -201,10 +203,11 @@ cdlogical(char *dest)
}
INTOFF;
if (updatepwd(badstat ? NULL : dest) < 0 || chdir(curdir) < 0) {
if ((p = findcwd(badstat ? NULL : dest)) == NULL || chdir(p) < 0) {
INTON;
return (-1);
}
updatepwd(p);
INTON;
return (0);
}
@ -212,12 +215,14 @@ cdlogical(char *dest)
STATIC int
cdphysical(char *dest)
{
char *p;
INTOFF;
if (chdir(dest) < 0 || updatepwd(NULL) < 0) {
if (chdir(dest) < 0 || (p = findcwd(NULL)) == NULL) {
INTON;
return (-1);
}
updatepwd(p);
INTON;
return (0);
}
@ -247,38 +252,20 @@ getcomponent(void)
}
/*
* Update curdir (the name of the current directory) in response to a
* cd command. We also call hashcd to let the routines in exec.c know
* that the current directory has changed.
*/
STATIC int
updatepwd(char *dir)
STATIC char *
findcwd(char *dir)
{
char *new;
char *p;
hashcd(); /* update command hash table */
/*
* If our argument is NULL, we don't know the current directory
* any more because we traversed a symbolic link or something
* we couldn't stat().
*/
if (dir == NULL || curdir == NULL) {
if (prevdir)
ckfree(prevdir);
INTOFF;
prevdir = curdir;
curdir = NULL;
if (getpwd() == NULL) {
INTON;
return (-1);
}
setvar("PWD", curdir, VEXPORT);
setvar("OLDPWD", prevdir, VEXPORT);
INTON;
return (0);
p = stalloc(PATH_MAX);
return getpwd2(p, PATH_MAX);
}
cdcomppath = stalloc(strlen(dir) + 1);
scopy(dir, cdcomppath);
@ -302,16 +289,25 @@ updatepwd(char *dir)
if (new == stackblock())
STPUTC('/', new);
STACKSTRNUL(new);
INTOFF;
return stackblock();
}
/*
* Update curdir (the name of the current directory) in response to a
* cd command. We also call hashcd to let the routines in exec.c know
* that the current directory has changed.
*/
STATIC void
updatepwd(char *dir)
{
hashcd(); /* update command hash table */
if (prevdir)
ckfree(prevdir);
prevdir = curdir;
curdir = savestr(stackblock());
curdir = savestr(dir);
setvar("PWD", curdir, VEXPORT);
setvar("OLDPWD", prevdir, VEXPORT);
INTON;
return (0);
}
int
@ -355,17 +351,31 @@ pwdcmd(int argc, char **argv)
}
/*
* Find out what the current directory is. If we already know the current
* directory, this routine returns immediately.
* Get the current directory and cache the result in curdir.
*/
char *
getpwd(void)
{
char buf[PATH_MAX];
char *p;
if (curdir)
return curdir;
if (getcwd(buf, sizeof(buf)) == NULL) {
p = getpwd2(buf, sizeof(buf));
if (p != NULL)
curdir = savestr(p);
return curdir;
}
/*
* Return the current directory.
*/
STATIC char *
getpwd2(char *buf, size_t size)
{
if (getcwd(buf, size) == NULL) {
char *pwd = getenv("PWD");
struct stat stdot, stpwd;
@ -373,12 +383,9 @@ getpwd(void)
stat(pwd, &stpwd) != -1 &&
stdot.st_dev == stpwd.st_dev &&
stdot.st_ino == stpwd.st_ino) {
curdir = savestr(pwd);
return curdir;
return pwd;
}
return NULL;
}
curdir = savestr(buf);
return curdir;
return buf;
}