add a do_realpath() implementation replacing the use of the external
libc function realpath(3) which may not be available on the target system; compile the realpath builtin unconditionally looks fine to me, but review is appreciated; this is (very) lightly based upon MirBSD libc’s realpath(3) and pdksh’s get_phys_path()
This commit is contained in:
tg
parent
75a7eb63e1
commit
31e02e59f7
20
Build.sh
20
Build.sh
@ -1,5 +1,5 @@
|
||||
#!/bin/sh
|
||||
srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.422 2009/08/28 17:37:47 tg Exp $'
|
||||
srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.423 2009/08/30 13:22:37 tg Exp $'
|
||||
#-
|
||||
# Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009
|
||||
# Thorsten Glaser <tg@mirbsd.org>
|
||||
@ -919,7 +919,6 @@ if ac_ifcpp 'ifdef MKSH_SMALL' isset_MKSH_SMALL '' \
|
||||
fi
|
||||
|
||||
: ${HAVE_MKNOD=0}
|
||||
: ${HAVE_REALPATH=0}
|
||||
: ${HAVE_REVOKE=0}
|
||||
: ${HAVE_PERSISTENT_HISTORY=0}
|
||||
check_categories=$check_categories,smksh
|
||||
@ -1168,23 +1167,6 @@ ac_test nice <<-'EOF'
|
||||
int main(void) { return (nice(4)); }
|
||||
EOF
|
||||
|
||||
ac_test realpath <<-'EOF'
|
||||
#if HAVE_SYS_PARAM_H
|
||||
#include <sys/param.h>
|
||||
#endif
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#ifndef PATH_MAX
|
||||
#define PATH_MAX 1024
|
||||
#endif
|
||||
char *res, dst[PATH_MAX];
|
||||
const char src[] = ".";
|
||||
int main(void) {
|
||||
res = realpath(src, dst);
|
||||
return (res == NULL ? 1 : 0);
|
||||
}
|
||||
EOF
|
||||
|
||||
ac_test revoke <<-'EOF'
|
||||
#include <sys/types.h>
|
||||
#if HAVE_LIBUTIL_H
|
||||
|
||||
162
funcs.c
162
funcs.c
@ -25,7 +25,7 @@
|
||||
|
||||
#include "sh.h"
|
||||
|
||||
__RCSID("$MirOS: src/bin/mksh/funcs.c,v 1.125 2009/08/28 21:51:51 tg Exp $");
|
||||
__RCSID("$MirOS: src/bin/mksh/funcs.c,v 1.126 2009/08/30 13:22:38 tg Exp $");
|
||||
|
||||
#if HAVE_KILLPG
|
||||
/*
|
||||
@ -102,9 +102,7 @@ const struct builtin mkshbuiltins[] = {
|
||||
#if HAVE_MKNOD
|
||||
{"mknod", c_mknod},
|
||||
#endif
|
||||
#if HAVE_REALPATH
|
||||
{"realpath", c_realpath},
|
||||
#endif
|
||||
{"rename", c_rename},
|
||||
{NULL, (int (*)(const char **))NULL}
|
||||
};
|
||||
@ -173,6 +171,146 @@ static void ptest_error(Test_env *, int, const char *);
|
||||
static char *kill_fmt_entry(const void *, int, char *, int);
|
||||
static void p_time(struct shf *, bool, long, int, int,
|
||||
const char *, const char *) __attribute__((nonnull (6, 7)));
|
||||
static char *do_realpath(const char *);
|
||||
|
||||
static char *
|
||||
do_realpath(const char *upath)
|
||||
{
|
||||
char *xp, *ip, *tp, *ipath, *ldest = NULL;
|
||||
XString xs;
|
||||
ptrdiff_t pos;
|
||||
size_t len;
|
||||
int symlinks = 32; /* max. recursion depth */
|
||||
int llen;
|
||||
struct stat sb;
|
||||
|
||||
if (upath[0] == '/') {
|
||||
/* upath is an absolute pathname */
|
||||
strdupx(ipath, upath, ATEMP);
|
||||
} else {
|
||||
/* upath is a relative pathname, prepend cwd */
|
||||
if ((tp = ksh_get_wd(NULL)) == NULL || tp[0] != '/')
|
||||
return (NULL);
|
||||
ipath = shf_smprintf("%s/%s", tp, upath);
|
||||
afree(tp, ATEMP);
|
||||
}
|
||||
|
||||
Xinit(xs, xp, strlen(ip = ipath) + 1, ATEMP);
|
||||
|
||||
while (*ip) {
|
||||
/* skip slashes in input */
|
||||
while (*ip == '/')
|
||||
++ip;
|
||||
if (!*ip)
|
||||
break;
|
||||
|
||||
/* get next pathname component from input */
|
||||
tp = ip;
|
||||
while (*ip && *ip != '/')
|
||||
++ip;
|
||||
len = ip - tp;
|
||||
|
||||
/* check input for "." and ".." */
|
||||
if (tp[0] == '.') {
|
||||
if (len == 1)
|
||||
/* just continue with the next one */
|
||||
continue;
|
||||
else if (len == 2 && tp[1] == '.') {
|
||||
/* strip off last pathname component */
|
||||
while (xp > Xstring(xs, xp))
|
||||
if (*--xp == '/')
|
||||
break;
|
||||
/* then continue with the next one */
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
/* store output position away, then append slash to output */
|
||||
pos = Xsavepos(xs, xp);
|
||||
Xcheck(xs, xp);
|
||||
Xput(xs, xp, '/');
|
||||
|
||||
/* append next pathname component to output */
|
||||
XcheckN(xs, xp, len + 1);
|
||||
memcpy(xp, tp, len);
|
||||
xp += len;
|
||||
*xp = '\0';
|
||||
|
||||
/* lstat the current output, see if it's a symlink */
|
||||
if (lstat(Xstring(xs, xp), &sb)) {
|
||||
/* lstat failed */
|
||||
if (errno == ENOENT) {
|
||||
/* because the pathname does not exist */
|
||||
while (*ip == '/')
|
||||
/* skip any trailing slashes */
|
||||
++ip;
|
||||
/* no more components left? */
|
||||
if (!*ip)
|
||||
/* we can still return successfully */
|
||||
break;
|
||||
/* more components left? fall through */
|
||||
}
|
||||
/* not ENOENT or not at the end of ipath */
|
||||
goto notfound;
|
||||
}
|
||||
|
||||
/* check if we encountered a symlink? */
|
||||
if (S_ISLNK(sb.st_mode)) {
|
||||
/* reached maximum recursion depth? */
|
||||
if (!symlinks--) {
|
||||
/* yep, prevent infinite loops */
|
||||
errno = ELOOP;
|
||||
goto notfound;
|
||||
}
|
||||
|
||||
/* get symlink(7) target */
|
||||
if (!ldest)
|
||||
ldest = alloc(PATH_MAX + 1, ATEMP);
|
||||
if ((llen = readlink(Xstring(xs, xp), ldest,
|
||||
PATH_MAX)) < 0)
|
||||
/* oops... */
|
||||
goto notfound;
|
||||
ldest[llen] = '\0';
|
||||
|
||||
/*
|
||||
* restart if symlink target is an absolute path,
|
||||
* otherwise continue with currently resolved prefix
|
||||
*/
|
||||
xp = (ldest[0] == '/') ? Xstring(xs, xp) :
|
||||
Xrestpos(xs, xp, pos);
|
||||
tp = shf_smprintf("%s/%s", ldest, ip);
|
||||
afree(ipath, ATEMP);
|
||||
ip = ipath = tp;
|
||||
}
|
||||
/* otherwise (no symlink) merely go on */
|
||||
}
|
||||
|
||||
/*
|
||||
* either found the target and successfully resolved it,
|
||||
* or found its parent directory and may create it
|
||||
*/
|
||||
if (Xlength(xs, xp) == 0)
|
||||
/*
|
||||
* if the resolved pathname is "", make it "/",
|
||||
* otherwise do not add a trailing slash
|
||||
*/
|
||||
Xput(xs, xp, '/');
|
||||
Xput(xs, xp, '\0');
|
||||
|
||||
if (ldest != NULL)
|
||||
afree(ldest, ATEMP);
|
||||
afree(ipath, ATEMP);
|
||||
return (Xclose(xs, xp));
|
||||
|
||||
notfound:
|
||||
llen = errno; /* save; free(3) might trash it */
|
||||
if (ldest != NULL)
|
||||
afree(ldest, ATEMP);
|
||||
afree(ipath, ATEMP);
|
||||
Xfree(xs, xp);
|
||||
errno = llen;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
int
|
||||
c_cd(const char **wp)
|
||||
@ -3124,11 +3262,11 @@ c_rename(const char **wp)
|
||||
return (rv);
|
||||
}
|
||||
|
||||
#if HAVE_REALPATH
|
||||
int
|
||||
c_realpath(const char **wp)
|
||||
{
|
||||
int rv = 1;
|
||||
char *buf;
|
||||
|
||||
if (wp != NULL && wp[0] != NULL && wp[1] != NULL) {
|
||||
if (strcmp(wp[1], "--")) {
|
||||
@ -3146,17 +3284,15 @@ c_realpath(const char **wp)
|
||||
|
||||
if (rv)
|
||||
bi_errorf(T_synerr);
|
||||
else {
|
||||
char *buf;
|
||||
|
||||
if (realpath(*wp, (buf = alloc(PATH_MAX, ATEMP))) == NULL) {
|
||||
rv = errno;
|
||||
bi_errorf("%s: %s", *wp, strerror(rv));
|
||||
} else
|
||||
shprintf("%s\n", buf);
|
||||
else if ((buf = do_realpath(*wp)) == NULL) {
|
||||
rv = errno;
|
||||
bi_errorf("%s: %s", *wp, strerror(rv));
|
||||
if ((unsigned int)rv > 255)
|
||||
rv = 255;
|
||||
} else {
|
||||
shprintf("%s\n", buf);
|
||||
afree(buf, ATEMP);
|
||||
}
|
||||
|
||||
return (rv);
|
||||
}
|
||||
#endif
|
||||
|
||||
4
sh.h
4
sh.h
@ -134,7 +134,7 @@
|
||||
#endif
|
||||
|
||||
#ifdef EXTERN
|
||||
__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.334 2009/08/28 22:46:21 tg Exp $");
|
||||
__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.335 2009/08/30 13:22:39 tg Exp $");
|
||||
#endif
|
||||
#define MKSH_VERSION "R39 2009/08/28"
|
||||
|
||||
@ -1434,9 +1434,7 @@ int c_test(const char **);
|
||||
#if HAVE_MKNOD
|
||||
int c_mknod(const char **);
|
||||
#endif
|
||||
#if HAVE_REALPATH
|
||||
int c_realpath(const char **);
|
||||
#endif
|
||||
int c_rename(const char **);
|
||||
/* histrap.c */
|
||||
void init_histvec(void);
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user