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* dcrt0.cc (insert_file): Avoid freeing previously allocated argument list.

Browse Source 
* path.cc (symlink_info::check): Rename from symlink_check_one.  Use new
symlink_info struct for communication.
(path_conv::path_conv): Use symlink_info structure for communication with
symlink_info::check.  Fix typo which resulted in symbolic links always being
resolved.
(readlink): Use stat_suffixes array when resolving a link.
* syscalls.cc (stat_suffixes): Make global.
This commit is contained in:
Christopher Faylor 2000-04-13 22:43:48 +00:00
parent 8a06963c1c
commit 2cf9359a8a
5 changed files with 83 additions and 69 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,15 @@
Thu Apr 13 18:32:26 2000 Christopher Faylor <cgf@cygnus.com>
* dcrt0.cc (insert_file): Avoid freeing previously allocated argument
list.
* path.cc (symlink_info::check): Rename from symlink_check_one. Use
new symlink_info struct for communication.
(path_conv::path_conv): Use symlink_info structure for communication
with symlink_info::check. Fix typo which resulted in symbolic links
always being resolved.
(readlink): Use stat_suffixes array when resolving a link.
* syscalls.cc (stat_suffixes): Make global.
Thu Apr 13 20:50:00 2000 Corinna Vinschen <corinna@vinschen.de> Thu Apr 13 20:50:00 2000 Corinna Vinschen <corinna@vinschen.de>
* include/cygwin/version.h: Bump minor api to reflect export change. * include/cygwin/version.h: Bump minor api to reflect export change.

1
winsup/cygwin/Makefile.in
View File

@ -338,4 +338,3 @@ uname.o: $(WINSUP_H)
wait.o: $(WINSUP_H) wait.o: $(WINSUP_H)
window.o: $(WINSUP_H) window.o: $(WINSUP_H)
thread.o: $(WINSUP_H) thread.o: $(WINSUP_H)

11
winsup/cygwin/dcrt0.cc
View File

@ -185,7 +185,7 @@ host_dependent_constants::init ()
* -@foo and not the contents of foo. * -@foo and not the contents of foo.
*/ */
static int __stdcall static int __stdcall
insert_file (char *name, char *&cmd) insert_file (char *name, char *&cmd, int& alloc_cmd)
{ {
HANDLE f; HANDLE f;
DWORD size; DWORD size;
@ -378,7 +378,7 @@ static void __stdcall
build_argv (char *cmd, char **&argv, int &argc, int winshell) build_argv (char *cmd, char **&argv, int &argc, int winshell)
{ {
int argvlen = 0; int argvlen = 0;
char *alloc_cmd = NULL; // command allocated by insert_file int alloc_cmd = 0; // command allocated by insert_file
int nesting = 0; // monitor "nesting" from insert_file int nesting = 0; // monitor "nesting" from insert_file
argc = 0; argc = 0;
@ -420,14 +420,9 @@ build_argv (char *cmd, char **&argv, int &argc, int winshell)
{ {
if (++nesting > MAX_AT_FILE_LEVEL) if (++nesting > MAX_AT_FILE_LEVEL)
api_fatal ("Too many levels of nesting for %s", word); api_fatal ("Too many levels of nesting for %s", word);
if (insert_file (word, cmd)) if (insert_file (word, cmd, alloc_cmd))
{
if (alloc_cmd)
free (alloc_cmd); // Free space from previous insert_file
alloc_cmd = cmd; // and remember it for next time.
continue; // There's new stuff in cmd now continue; // There's new stuff in cmd now
} }
}
/* See if we need to allocate more space for argv */ /* See if we need to allocate more space for argv */
if (argc >= argvlen) if (argc >= argvlen)

124
winsup/cygwin/path.cc
View File

@ -87,10 +87,6 @@ details. */
#include "winsup.h" #include "winsup.h"
#include <ctype.h> #include <ctype.h>
static int symlink_check_one (const char *path, char *buf, int buflen,
DWORD& fileattr, unsigned *pflags,
const suffix_info *suffixes,
char *&found_suffix);
static int normalize_win32_path (const char *cwd, const char *src, char *dst); static int normalize_win32_path (const char *cwd, const char *src, char *dst);
static char *getcwd_inner (char *buf, size_t ulen, int posix_p); static char *getcwd_inner (char *buf, size_t ulen, int posix_p);
static void slashify (const char *src, char *dst, int trailing_slash_p); static void slashify (const char *src, char *dst, int trailing_slash_p);
@ -100,6 +96,19 @@ static int get_current_directory_name ();
static NO_COPY const char escape_char = '^'; static NO_COPY const char escape_char = '^';
struct symlink_info
{
char buf[3 + MAX_PATH * 3];
char *known_suffix;
char *ext_here;
char *contents;
unsigned pflags;
DWORD fileattr;
int is_symlink;
symlink_info (): known_suffix (NULL), contents (buf + MAX_PATH + 1) {}
int check (const char *path, const suffix_info *suffixes);
};
/********************** Path Helper Functions *************************/ /********************** Path Helper Functions *************************/
#define path_prefix_p(p1, p2, l1) \ #define path_prefix_p(p1, p2, l1) \
@ -183,9 +192,9 @@ path_conv::path_conv (const char *src, symlink_follow follow_mode,
/* This array is used when expanding symlinks. It is MAX_PATH * 2 /* This array is used when expanding symlinks. It is MAX_PATH * 2
in length so that we can hold the expanded symlink plus a in length so that we can hold the expanded symlink plus a
trailer. */ trailer. */
char work_buf[MAX_PATH * 3 + 3];
char path_buf[MAX_PATH]; char path_buf[MAX_PATH];
char path_copy[MAX_PATH]; char path_copy[MAX_PATH];
symlink_info sym;
char *rel_path, *full_path; char *rel_path, *full_path;
@ -197,7 +206,6 @@ path_conv::path_conv (const char *src, symlink_follow follow_mode,
else else
rel_path = this->path, full_path = path_buf; rel_path = this->path, full_path = path_buf;
char *sym_buf = work_buf + MAX_PATH + 1;
/* This loop handles symlink expansion. */ /* This loop handles symlink expansion. */
int loop = 0; int loop = 0;
path_flags = 0; path_flags = 0;
@ -241,47 +249,46 @@ path_conv::path_conv (const char *src, symlink_follow follow_mode,
tail = path_copy + 1 + (tail - full_path); // Point to end of copy tail = path_copy + 1 + (tail - full_path); // Point to end of copy
*sym_buf = '\0'; // Paranoid
/* Scan path_copy from right to left looking either for a symlink /* Scan path_copy from right to left looking either for a symlink
or an actual existing file. If an existing file is found, just or an actual existing file. If an existing file is found, just
return. If a symlink is found exit the for loop. return. If a symlink is found exit the for loop.
Also: be careful to preserve the errno returned from Also: be careful to preserve the errno returned from
symlink_check_one as the caller may need it. */ symlink.check as the caller may need it. */
/* FIXME: Do we have to worry about multiple \'s here? */ /* FIXME: Do we have to worry about multiple \'s here? */
int component = 0; // Number of translated components int component = 0; // Number of translated components
DWORD attr; sym.contents[0] = '\0';
for (;;) for (;;)
{ {
save_errno s (0); save_errno s (0);
unsigned dummy_flags, *fp;
const suffix_info *suff; const suffix_info *suff;
/* Don't allow symlink_check_one to set anything in the path_conv /* Don't allow symlink.check to set anything in the path_conv
class if we're working on an inner component of the path */ class if we're working on an inner component of the path */
if (component) if (component)
{ {
fp = &dummy_flags;
suff = NULL; suff = NULL;
sym.pflags = 0;
} }
else else
{ {
fp = &path_flags;
suff = suffixes; suff = suffixes;
sym.pflags = path_flags;
} }
MALLOC_CHECK;
int len = symlink_check_one (path_copy, sym_buf, MAX_PATH, attr,
fp, suff, known_suffix);
MALLOC_CHECK;
/* If symlink_check_one found an existing non-symlink file, then int len = sym.check (path_copy, suff);
if (!component)
path_flags = sym.pflags;
/* If symlink.check found an existing non-symlink file, then
it returns a length of 0 and sets errno to EINVAL. It also sets it returns a length of 0 and sets errno to EINVAL. It also sets
any suffix found into `sym_buf'. */ any suffix found into `ext_here'. */
if (!len && get_errno () == EINVAL) if (!sym.is_symlink && sym.fileattr != (DWORD) -1)
{ {
if (component == 0) if (component == 0)
{ {
fileattr = attr; fileattr = sym.fileattr;
goto fillin; goto fillin;
} }
goto out; // file found goto out; // file found
@ -293,18 +300,19 @@ path_conv::path_conv (const char *src, symlink_follow follow_mode,
these operations again on the newly derived path. */ these operations again on the newly derived path. */
else if (len > 0) else if (len > 0)
{ {
if (component != 0 && follow_mode != SYMLINK_FOLLOW) if (component == 0 && follow_mode != SYMLINK_FOLLOW)
{ {
set_symlink (); // last component of path is a symlink. set_symlink (); // last component of path is a symlink.
fileattr = attr; fileattr = sym.fileattr;
if (follow_mode == SYMLINK_CONTENTS) if (follow_mode == SYMLINK_CONTENTS)
strcpy (path, sym_buf); strcpy (path, sym.contents);
goto fillin; goto fillin;
} }
break; break;
} }
s.reset (); // remember errno from symlink_check_one /* No existing file found. */
s.reset (); // remember errno from symlink.check
if (!(tail = strrchr (path_copy, '\\')) || if (!(tail = strrchr (path_copy, '\\')) ||
(tail > path_copy && tail[-1] == ':')) (tail > path_copy && tail[-1] == ':'))
@ -326,7 +334,7 @@ path_conv::path_conv (const char *src, symlink_follow follow_mode,
tail = full_path + (tail - path_copy); tail = full_path + (tail - path_copy);
int taillen = strlen (tail); int taillen = strlen (tail);
int buflen = strlen (sym_buf); int buflen = strlen (sym.contents);
if (buflen + taillen > MAX_PATH) if (buflen + taillen > MAX_PATH)
{ {
error = ENAMETOOLONG; error = ENAMETOOLONG;
@ -336,23 +344,23 @@ path_conv::path_conv (const char *src, symlink_follow follow_mode,
/* Copy tail of full_path to discovered symlink. */ /* Copy tail of full_path to discovered symlink. */
char *p; char *p;
for (p = sym_buf + buflen; *tail; tail++) for (p = sym.contents + buflen; *tail; tail++)
*p++ = *tail == '\\' ? '/' : *tail; *p++ = *tail == '\\' ? '/' : *tail;
*p = '\0'; *p = '\0';
/* If symlink referred to an absolute path, then we /* If symlink referred to an absolute path, then we
just use sym_buf and loop. Otherwise tack the head of just use sym.contents and loop. Otherwise tack the head of
path_copy before sym_buf and translate it back from a path_copy before sym.contents and translate it back from a
Win32-style path to a POSIX-style one. */ Win32-style path to a POSIX-style one. */
if (isabspath (sym_buf)) if (isabspath (sym.contents))
src = sym_buf; src = sym.contents;
else if (!(tail = strrchr (path_copy, '\\'))) else if (!(tail = strrchr (path_copy, '\\')))
system_printf ("problem parsing %s - '%s'", src, full_path); system_printf ("problem parsing %s - '%s'", src, full_path);
else else
{ {
char tmp_buf[MAX_PATH]; char tmp_buf[MAX_PATH];
int headlen = 1 + tail - path_copy; int headlen = 1 + tail - path_copy;
p = sym_buf - headlen; p = sym.contents - headlen;
memcpy (p, path_copy, headlen); memcpy (p, path_copy, headlen);
MALLOC_CHECK; MALLOC_CHECK;
error = cygwin_shared->mount.conv_to_posix_path (p, tmp_buf, 1); error = cygwin_shared->mount.conv_to_posix_path (p, tmp_buf, 1);
@ -364,13 +372,13 @@ path_conv::path_conv (const char *src, symlink_follow follow_mode,
} }
fillin: fillin:
if (*sym_buf) if (sym.known_suffix)
known_suffix = this->path + (sym.known_suffix - path_copy);
else if (sym.ext_here && follow_mode != SYMLINK_CONTENTS)
{ {
known_suffix = strchr (this->path, '\0'); known_suffix = strchr (this->path, '\0');
strcpy (known_suffix, sym_buf); strcpy (known_suffix, sym.ext_here);
} }
else if (known_suffix)
known_suffix = this->path + (known_suffix - path_copy);
out: out:
DWORD serial, volflags; DWORD serial, volflags;
@ -2126,14 +2134,12 @@ next_suffix (char *ext_here, const suffix_info *&suffixes)
Return -1 on error, 0 if PATH is not a symlink, or the length Return -1 on error, 0 if PATH is not a symlink, or the length
stored into BUF if PATH is a symlink. */ stored into BUF if PATH is a symlink. */
static int int
symlink_check_one (const char *in_path, char *buf, int buflen, DWORD& fileattr, symlink_info::check (const char *in_path, const suffix_info *suffixes)
unsigned *pflags, const suffix_info *suffixes, char *&known_suffix)
{ {
HANDLE h; HANDLE h;
int res = 0; int res = 0;
char extbuf[buflen + 5]; char extbuf[MAX_PATH + 5];
char *ext_here;
const char *path = in_path; const char *path = in_path;
if (!suffixes) if (!suffixes)
@ -2149,7 +2155,8 @@ symlink_check_one (const char *in_path, char *buf, int buflen, DWORD& fileattr,
ext_here = strchr (path, '\0'); ext_here = strchr (path, '\0');
} }
*buf = '\0'; is_symlink = TRUE;
do do
{ {
if (!next_suffix (ext_here, suffixes)) if (!next_suffix (ext_here, suffixes))
@ -2178,7 +2185,7 @@ symlink_check_one (const char *in_path, char *buf, int buflen, DWORD& fileattr,
/* A symlink will have the `system' file attribute. */ /* A symlink will have the `system' file attribute. */
/* Only files can be symlinks (which can be symlinks to directories). */ /* Only files can be symlinks (which can be symlinks to directories). */
if (!(*pflags & PATH_SYMLINK) && !SYMLINKATTR (fileattr)) if (!(pflags & PATH_SYMLINK) && !SYMLINKATTR (fileattr))
goto file_not_symlink; goto file_not_symlink;
/* Check the file's extended attributes, if it has any. */ /* Check the file's extended attributes, if it has any. */
@ -2189,7 +2196,7 @@ symlink_check_one (const char *in_path, char *buf, int buflen, DWORD& fileattr,
if (!get_file_attribute (TRUE, path, &unixattr)) if (!get_file_attribute (TRUE, path, &unixattr))
{ {
if (unixattr & STD_XBITS) if (unixattr & STD_XBITS)
*pflags |= PATH_EXEC; pflags |= PATH_EXEC;
} }
/* Open the file. */ /* Open the file. */
@ -2215,9 +2222,9 @@ syscall_printf ("ReadFile");
sizeof (cookie_buf)) == 0) sizeof (cookie_buf)) == 0)
{ {
/* It's a symlink. */ /* It's a symlink. */
*pflags = PATH_SYMLINK; pflags = PATH_SYMLINK;
res = ReadFile (h, buf, buflen, &got, 0); res = ReadFile (h, contents, MAX_PATH + 1, &got, 0);
if (!res) if (!res)
set_errno (EIO); set_errno (EIO);
else else
@ -2228,8 +2235,8 @@ syscall_printf ("ReadFile");
NUL. The length returned is the path without NUL. The length returned is the path without
*any* trailing NULs. We also have to handle (or *any* trailing NULs. We also have to handle (or
at least not die from) corrupted paths. */ at least not die from) corrupted paths. */
if (memchr (buf, 0, got) != NULL) if (memchr (contents, 0, got) != NULL)
res = strlen (buf); res = strlen (contents);
else else
res = got; res = got;
} }
@ -2238,16 +2245,16 @@ syscall_printf ("ReadFile");
&& memcmp (cookie_buf, SOCKET_COOKIE, && memcmp (cookie_buf, SOCKET_COOKIE,
sizeof (cookie_buf)) == 0) sizeof (cookie_buf)) == 0)
{ {
*pflags |= PATH_SOCKET; pflags |= PATH_SOCKET;
goto close_and_return; goto close_and_return;
} }
else else
{ {
/* Not a symlink, see if executable. */ /* Not a symlink, see if executable. */
if (!(*pflags & PATH_EXEC) && got >= 2 && if (!(pflags & PATH_EXEC) && got >= 2 &&
((cookie_buf[0] == '#' && cookie_buf[1] == '!') || ((cookie_buf[0] == '#' && cookie_buf[1] == '!') ||
(cookie_buf[0] == ':' && cookie_buf[1] == '\n'))) (cookie_buf[0] == ':' && cookie_buf[1] == '\n')))
*pflags |= PATH_EXEC; pflags |= PATH_EXEC;
close_and_return: close_and_return:
syscall_printf ("close_and_return"); syscall_printf ("close_and_return");
CloseHandle (h); CloseHandle (h);
@ -2264,14 +2271,13 @@ syscall_printf ("breaking from loop");
file_not_symlink: file_not_symlink:
set_errno (EINVAL); set_errno (EINVAL);
is_symlink = FALSE;
syscall_printf ("not a symlink"); syscall_printf ("not a symlink");
if (ext_here)
strcpy (buf, ext_here);
res = 0; res = 0;
out: out:
syscall_printf ("%d = symlink_check_one (%s, %p, %d) (%p)", syscall_printf ("%d = symlink.check (%s, %p) (%p)",
res, path, buf, buflen, *pflags); res, path, contents, pflags);
return res; return res;
} }
@ -2282,7 +2288,9 @@ extern "C"
int int
readlink (const char *path, char *buf, int buflen) readlink (const char *path, char *buf, int buflen)
{ {
path_conv pathbuf (path, SYMLINK_CONTENTS); extern suffix_info stat_suffixes[];
path_conv pathbuf (path, SYMLINK_CONTENTS, 0, stat_suffixes);
if (pathbuf.error) if (pathbuf.error)
{ {
set_errno (pathbuf.error); set_errno (pathbuf.error);
@ -2306,7 +2314,7 @@ readlink (const char *path, char *buf, int buflen)
memcpy (buf, pathbuf.get_win32 (), len); memcpy (buf, pathbuf.get_win32 (), len);
buf[len] = '\0'; buf[len] = '\0';
/* errno set by symlink_check_one if error */ /* errno set by symlink.check if error */
return len; return len;
} }

2
winsup/cygwin/syscalls.cc
View File

@ -960,7 +960,7 @@ stat_dev (DWORD devn, int unit, unsigned long ino, struct stat *buf)
return 0; return 0;
} }
static suffix_info stat_suffixes[] = suffix_info stat_suffixes[] =
{ {
suffix_info ("", 1), suffix_info ("", 1),
suffix_info (".exe", 1), suffix_info (".exe", 1),