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Handle current work directories of arbitrary length. The argument to cd

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continues to be limited by PATH_MAX (1024).

Obtained from:	NetBSD
PR:		104456
This commit is contained in:
Stefan Farfeleder 2009-11-21 14:53:22 +00:00
parent c6204d4a81
commit 1c645e0f5b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=199631
1 changed files with 28 additions and 21 deletions
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49
bin/sh/cd.c
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@ -70,7 +70,7 @@ STATIC int docd(char *, int, int);
STATIC char *getcomponent(void);
STATIC char *findcwd(char *);
STATIC void updatepwd(char *);
STATIC char *getpwd2(char *, size_t);
STATIC char *getpwd2(void);
STATIC char *curdir = NULL; /* current working directory */
STATIC char *prevdir; /* previous working directory */
@ -263,10 +263,8 @@ findcwd(char *dir)
* any more because we traversed a symbolic link or something
* we couldn't stat().
*/
if (dir == NULL || curdir == NULL) {
p = stalloc(PATH_MAX);
return getpwd2(p, PATH_MAX);
}
if (dir == NULL || curdir == NULL)
return getpwd2();
cdcomppath = stalloc(strlen(dir) + 1);
scopy(dir, cdcomppath);
STARTSTACKSTR(new);
@ -313,7 +311,7 @@ updatepwd(char *dir)
int
pwdcmd(int argc, char **argv)
{
char buf[PATH_MAX];
char *p;
int ch, phys;
optreset = 1; optind = 1; opterr = 0; /* initialize getopt */
@ -341,9 +339,9 @@ pwdcmd(int argc, char **argv)
out1str(curdir);
out1c('\n');
} else {
if (getcwd(buf, sizeof(buf)) == NULL)
if ((p = getpwd2()) == NULL)
error(".: %s", strerror(errno));
out1str(buf);
out1str(p);
out1c('\n');
}
@ -356,36 +354,45 @@ pwdcmd(int argc, char **argv)
char *
getpwd(void)
{
char buf[PATH_MAX];
char *p;
if (curdir)
return curdir;
p = getpwd2(buf, sizeof(buf));
p = getpwd2();
if (p != NULL)
curdir = savestr(p);
return curdir;
}
#define MAXPWD 256
/*
* Return the current directory.
*/
STATIC char *
getpwd2(char *buf, size_t size)
getpwd2(void)
{
if (getcwd(buf, size) == NULL) {
char *pwd = getenv("PWD");
struct stat stdot, stpwd;
struct stat stdot, stpwd;
char *pwd;
int i;
if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
stat(pwd, &stpwd) != -1 &&
stdot.st_dev == stpwd.st_dev &&
stdot.st_ino == stpwd.st_ino) {
for (i = MAXPWD;; i *= 2) {
pwd = stalloc(i);
if (getcwd(pwd, i) != NULL)
return pwd;
}
return NULL;
stunalloc(pwd);
if (errno != ERANGE)
break;
}
return buf;
pwd = getenv("PWD");
if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
stat(pwd, &stpwd) != -1 &&
stdot.st_dev == stpwd.st_dev &&
stdot.st_ino == stpwd.st_ino) {
return pwd;
}
return NULL;
}