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Bring back the cd -L and -P options from revision 1.24, but try harder not

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to fail when the logical current directory no longer exists. Allow changes
to absolute paths when logical cwd is invalid, fall back to physical cd
if logical cd fails.
This commit is contained in:
Tim J. Robbins 2002-05-22 05:15:53 +00:00
parent baf3e7c14b
commit 09086b0499
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=97092
1 changed files with 106 additions and 34 deletions
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140
bin/sh/cd.c
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@ -67,25 +67,47 @@ static const char rcsid[] =
#include "show.h"
#include "cd.h"
STATIC int docd(char *, int);
STATIC int cdlogical(char *);
STATIC int cdphysical(char *);
STATIC int docd(char *, int, int);
STATIC char *getcomponent(void);
STATIC void updatepwd(char *);
STATIC int updatepwd(char *);
char *curdir = NULL; /* current working directory */
char *prevdir; /* previous working directory */
STATIC char *cdcomppath;
int
cdcmd(int argc __unused, char **argv __unused)
cdcmd(int argc, char **argv)
{
char *dest;
char *path;
char *p;
struct stat statb;
int print = 0;
int ch, phys, print = 0;
nextopt(nullstr);
if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
optreset = 1; optind = 1; /* initialize getopt */
phys = 0;
while ((ch = getopt(argc, argv, "LP")) != -1) {
switch (ch) {
case 'L':
phys = 0;
break;
case 'P':
phys = 1;
break;
default:
error("unknown option: -%c", optopt);
break;
}
}
argc -= optind;
argv += optind;
if (argc > 1)
error("too many arguments");
if ((dest = *argv) == NULL && (dest = bltinlookup("HOME", 1)) == NULL)
error("HOME not set");
if (*dest == '\0')
dest = ".";
@ -108,9 +130,8 @@ cdcmd(int argc __unused, char **argv __unused)
p += 2;
print = strcmp(p, dest);
}
if (docd(p, print) >= 0)
if (docd(p, print, phys) >= 0)
return 0;
}
}
error("can't cd to %s", dest);
@ -120,11 +141,27 @@ cdcmd(int argc __unused, char **argv __unused)
/*
* Actually do the chdir. In an interactive shell, print the
* Actually change the directory. In an interactive shell, print the
* directory name if "print" is nonzero.
*/
STATIC int
docd(char *dest, int print)
docd(char *dest, int print, int phys)
{
TRACE(("docd(\"%s\", %d, %d) called\n", dest, print, phys));
/* If logical cd fails, fall back to physical. */
if ((phys || cdlogical(dest) < 0) && cdphysical(dest) < 0)
return (-1);
if (print && iflag && curdir)
out1fmt("%s\n", curdir);
return 0;
}
STATIC int
cdlogical(char *dest)
{
char *p;
char *q;
@ -133,8 +170,6 @@ docd(char *dest, int print)
int first;
int badstat;
TRACE(("docd(\"%s\", %d) called\n", dest, print));
/*
* Check each component of the path. If we find a symlink or
* something we can't stat, clear curdir to force a getcwd()
@ -161,26 +196,33 @@ docd(char *dest, int print)
if (equal(component, ".."))
continue;
STACKSTRNUL(p);
if ((lstat(stackblock(), &statb) < 0)
|| (S_ISLNK(statb.st_mode))) {
/* print = 1; */
if (lstat(stackblock(), &statb) < 0) {
badstat = 1;
break;
}
}
INTOFF;
if (chdir(dest) < 0) {
if (updatepwd(badstat ? NULL : dest) < 0 || chdir(curdir) < 0) {
INTON;
return -1;
return (-1);
}
updatepwd(badstat ? NULL : dest);
INTON;
if (print && iflag && curdir)
out1fmt("%s\n", curdir);
return 0;
return (0);
}
STATIC int
cdphysical(char *dest)
{
INTOFF;
if (chdir(dest) < 0 || updatepwd(NULL) < 0) {
INTON;
return (-1);
}
INTON;
return (0);
}
/*
* Get the next component of the path name pointed to by cdcomppath.
@ -212,7 +254,7 @@ getcomponent(void)
* cd command. We also call hashcd to let the routines in exec.c know
* that the current directory has changed.
*/
STATIC void
STATIC int
updatepwd(char *dir)
{
char *new;
@ -231,12 +273,14 @@ updatepwd(char *dir)
INTOFF;
prevdir = curdir;
curdir = NULL;
if (getpwd() == NULL)
error("getcwd() failed: %s", strerror(errno));
if (getpwd() == NULL) {
INTON;
return (-1);
}
setvar("PWD", curdir, VEXPORT);
setvar("OLDPWD", prevdir, VEXPORT);
INTON;
return;
return (0);
}
cdcomppath = stalloc(strlen(dir) + 1);
scopy(dir, cdcomppath);
@ -268,24 +312,52 @@ updatepwd(char *dir)
setvar("PWD", curdir, VEXPORT);
setvar("OLDPWD", prevdir, VEXPORT);
INTON;
return (0);
}
#define MAXPWD 256
int
pwdcmd(int argc __unused, char **argv __unused)
{
if (!getpwd())
error("getcwd() failed: %s", strerror(errno));
out1str(curdir);
out1c('\n');
char buf[MAXPWD];
int ch, phys;
optreset = 1; optind = 1; /* initialize getopt */
phys = 0;
while ((ch = getopt(argc, argv, "LP")) != -1) {
switch (ch) {
case 'L':
phys = 0;
break;
case 'P':
phys = 1;
break;
default:
error("unknown option: -%c", optopt);
break;
}
}
argc -= optind;
argv += optind;
if (argc != 0)
error("too many arguments");
if (!phys && getpwd()) {
out1str(curdir);
out1c('\n');
} else {
if (getcwd(buf, sizeof(buf)) == NULL)
error(".: %s", strerror(errno));
out1str(buf);
out1c('\n');
}
return 0;
}
#define MAXPWD 256
/*
* Find out what the current directory is. If we already know the current
* directory, this routine returns immediately.