X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=src%2Frealpath.c;h=94b4699d197978a4897e78d00fadb82612f279ba;hb=28fe5ec1aa47e9b65187496cf626e3e5e9d1a485;hp=b39257d0ada28183db43d96900ed6753a757de55;hpb=c8aa261a7bf3eb1389d2e018be1d715f73cacd66;p=chise%2Fxemacs-chise.git- diff --git a/src/realpath.c b/src/realpath.c index b39257d..94b4699 100644 --- a/src/realpath.c +++ b/src/realpath.c @@ -23,26 +23,150 @@ Boston, MA 02111-1307, USA. */ /* Synched up with: Not in FSF. */ #include - -#include -#include -#include +#include "lisp.h" #include + #ifdef HAVE_UNISTD_H #include #endif -#ifdef _POSIX_VERSION -#include /* for PATH_MAX */ -#else -#include /* for MAXPATHLEN */ + +#if defined (HAVE_SYS_PARAM_H) && !defined (WIN32_NATIVE) +#include #endif -#ifdef WINDOWSNT +#ifdef WIN32_NATIVE #include #endif #include /* for S_IFLNK */ +/* First char after start of absolute filename. */ +#define ABS_START(name) (name + ABS_LENGTH (name)) + +#if defined (WIN32_NATIVE) +/* Length of start of absolute filename. */ +# define ABS_LENGTH(name) (win32_abs_start (name)) +static int win32_abs_start (const char * name); +/* System dependent version of readlink. */ +# define system_readlink win32_readlink +#else +# ifdef CYGWIN +# define ABS_LENGTH(name) (IS_DIRECTORY_SEP (*name) ? \ + (IS_DIRECTORY_SEP (name[1]) ? 2 : 1) : 0) +# define system_readlink cygwin_readlink +# else +# define ABS_LENGTH(name) (IS_DIRECTORY_SEP (*name) ? 1 : 0) +# define system_readlink readlink +# endif /* CYGWIN */ +#endif /* WIN32_NATIVE */ + +#if defined (WIN32_NATIVE) || defined (CYGWIN) +#include "syswindows.h" +/* Emulate readlink on win32 - finds real name (i.e. correct case) of + a file. UNC servers and shares are lower-cased. Directories must be + given without trailing '/'. One day, this could read Win2K's + reparse points. */ +static int +win32_readlink (const char * name, char * buf, int size) +{ + WIN32_FIND_DATA find_data; + HANDLE dir_handle = NULL; + int len = 0; + int err = 0; + const char* lastname; + int count = 0; + const char* tmp; + char* res = NULL; + + assert (*name); + + /* Sort of check we have a valid filename. */ + if (strpbrk (name, "*?|<>\"") || strlen (name) >= MAX_PATH) + { + errno = EIO; + return -1; + } + + /* Find start of filename */ + lastname = name + strlen (name); + while (lastname > name && !IS_DIRECTORY_SEP (lastname[-1])) + --lastname; + + /* Count slashes in unc path */ + if (ABS_LENGTH (name) == 2) + for (tmp = name; *tmp; tmp++) + if (IS_DIRECTORY_SEP (*tmp)) + count++; + + if (count >= 2 && count < 4) + { + /* UNC server or share name: just copy lowercased name. */ + res = find_data.cFileName; + for (tmp = lastname; *tmp; tmp++) + *res++ = tolower (*tmp); + *res = '\0'; + } + else + dir_handle = FindFirstFile (name, &find_data); + + if (res || dir_handle != INVALID_HANDLE_VALUE) + { + if ((len = strlen (find_data.cFileName)) < size) + { + if (strcmp (lastname, find_data.cFileName) == 0) + /* Signal that the name is already OK. */ + err = EINVAL; + else + memcpy (buf, find_data.cFileName, len + 1); + } + else + err = ENAMETOOLONG; + if (!res) FindClose (dir_handle); + } + else + err = ENOENT; + + errno = err; + return err ? -1 : len; +} +#endif /* WIN32_NATIVE || CYGWIN */ + +#ifdef CYGWIN +/* Call readlink and try to find out the correct case for the file. */ +static int +cygwin_readlink (const char * name, char * buf, int size) +{ + int n = readlink (name, buf, size); + if (n < 0) + { + /* The file may exist, but isn't a symlink. Try to find the + right name. */ + char* tmp = alloca (cygwin_posix_to_win32_path_list_buf_size (name)); + cygwin_posix_to_win32_path_list (name, tmp); + n = win32_readlink (tmp, buf, size); + } + return n; +} +#endif /* CYGWIN */ + +#ifdef WIN32_NATIVE +#ifndef ELOOP +#define ELOOP 10062 /* = WSAELOOP in winsock.h */ +#endif +/* Length of start of absolute filename. */ +static int +win32_abs_start (const char * name) +{ + if (isalpha (*name) && IS_DEVICE_SEP (name[1]) + && IS_DIRECTORY_SEP (name[2])) + return 3; + else if (IS_DIRECTORY_SEP (*name)) + return IS_DIRECTORY_SEP (name[1]) ? 2 : 1; + else + return 0; +} +#endif /* WIN32_NATIVE */ + #if !defined (HAVE_GETCWD) && defined (HAVE_GETWD) #undef getcwd #define getcwd(buffer, len) getwd (buffer) @@ -67,78 +191,63 @@ xrealpath (const char *path, char resolved_path []) char copy_path[PATH_MAX]; char *new_path = resolved_path; char *max_path; -#ifdef S_IFLNK +#if defined (S_IFLNK) || defined (WIN32_NATIVE) int readlinks = 0; char link_path[PATH_MAX]; int n; + int abslen = ABS_LENGTH (path); #endif /* Make a copy of the source path since we may need to modify it. */ - strcpy(copy_path, path); + strcpy (copy_path, path); path = copy_path; max_path = copy_path + PATH_MAX - 2; -#ifdef WINDOWSNT - /* - ** In NT we have two different cases: (1) the path name begins - ** with a drive letter, e.g., "C:"; and (2) the path name begins - ** with just a slash, which roots to the current drive. In the - ** first case we are going to leave things alone, in the second - ** case we will prepend the drive letter to the given path. - ** Note: So far in testing, I'm only seeing case #1, even though - ** I've tried to get the other cases to happen. - ** August Hill, 31 Aug 1997. - ** - ** Check for a driver letter...C:/... - */ - if (*(path + 1) == ':') + +#ifdef WIN32_NATIVE + /* Check for c:/... or //server/... */ + if (abslen == 2 || abslen == 3) { - strncpy(new_path, path, 3); - new_path += 3; - path += 3; + strncpy (new_path, path, abslen); + new_path += abslen; + path += abslen; } - - /* - ** No drive letter, but a beginning slash? Prepend the drive - ** letter... - */ - else if (*path == '/') + /* No drive letter, but a beginning slash? Prepend drive letter. */ + else if (abslen == 1) { getcwd (new_path, PATH_MAX - 1); new_path += 3; path++; } - - /* - ** Just a path name, prepend the current directory - */ + /* Just a path name, prepend the current directory */ else { getcwd (new_path, PATH_MAX - 1); - new_path += strlen(new_path); - if (new_path[-1] != '/') - *new_path++ = '/'; + new_path += strlen (new_path); + if (!IS_DIRECTORY_SEP (new_path[-1])) + *new_path++ = DIRECTORY_SEP; } - #else /* If it's a relative pathname use getcwd for starters. */ - if (*path != '/') + if (abslen == 0) { getcwd (new_path, PATH_MAX - 1); - new_path += strlen(new_path); - if (new_path[-1] != '/') - *new_path++ = '/'; + new_path += strlen (new_path); + if (!IS_DIRECTORY_SEP (new_path[-1])) + *new_path++ = DIRECTORY_SEP; } else { - *new_path++ = '/'; - path++; + /* Copy first directory sep. May have two on cygwin. */ + strncpy (new_path, path, abslen); + new_path += abslen; + path += abslen; } #endif /* Expand each slash-separated pathname component. */ while (*path != '\0') { /* Ignore stray "/". */ - if (*path == '/') + if (IS_DIRECTORY_SEP (*path)) { path++; continue; @@ -147,32 +256,32 @@ xrealpath (const char *path, char resolved_path []) if (*path == '.') { /* Ignore ".". */ - if (path[1] == '\0' || path[1] == '/') + if (path[1] == '\0' || IS_DIRECTORY_SEP (path[1])) { path++; continue; } - if (path[1] == '.') + /* Handle ".." */ + if (path[1] == '.' && + (path[2] == '\0' || IS_DIRECTORY_SEP (path[2]))) { - if (path[2] == '\0' || path[2] == '/') - { - path += 2; - - /* Ignore ".." at root. */ - if (new_path == resolved_path + 1) - continue; - - /* Handle ".." by backing up. */ - while ((--new_path)[-1] != '/') - ; - continue; - } + path += 2; + + /* Ignore ".." at root. */ + if (new_path == ABS_START (resolved_path)) + continue; + + /* Handle ".." by backing up. */ + --new_path; + while (!IS_DIRECTORY_SEP (new_path[-1])) + --new_path; + continue; } } /* Safely copy the next pathname component. */ - while (*path != '\0' && *path != '/') + while (*path != '\0' && !IS_DIRECTORY_SEP (*path)) { if (path > max_path) { @@ -182,10 +291,10 @@ xrealpath (const char *path, char resolved_path []) *new_path++ = *path++; } -#ifdef S_IFLNK +#if defined (S_IFLNK) || defined (WIN32_NATIVE) /* See if latest pathname component is a symlink. */ *new_path = '\0'; - n = readlink(resolved_path, link_path, PATH_MAX - 1); + n = system_readlink (resolved_path, link_path, PATH_MAX - 1); if (n < 0) { @@ -204,14 +313,14 @@ xrealpath (const char *path, char resolved_path []) /* Note: readlink doesn't add the null byte. */ link_path[n] = '\0'; - - if (*link_path == '/') + + if (ABS_LENGTH (link_path) > 0) /* Start over for an absolute symlink. */ - new_path = resolved_path; + new_path = resolved_path + ABS_LENGTH (link_path) - 1; else /* Otherwise back up over this component. */ - while (*(--new_path) != '/') - ; + for (--new_path; !IS_DIRECTORY_SEP (*new_path); --new_path) + assert (new_path > resolved_path); /* Safe sex check. */ if (strlen(path) + n >= PATH_MAX) @@ -225,15 +334,21 @@ xrealpath (const char *path, char resolved_path []) strcpy(copy_path, link_path); path = copy_path; } -#endif /* S_IFLNK */ - *new_path++ = '/'; +#endif /* S_IFLNK || WIN32_NATIVE */ + *new_path++ = DIRECTORY_SEP; } /* Delete trailing slash but don't whomp a lone slash. */ - if (new_path != resolved_path + 1 && new_path[-1] == '/') + if (new_path != ABS_START (resolved_path) && IS_DIRECTORY_SEP (new_path[-1])) new_path--; /* Make sure it's null terminated. */ *new_path = '\0'; + +#ifdef WIN32_NATIVE + if (ABS_LENGTH (resolved_path) == 3) + /* Lowercase drive letter. */ + *resolved_path = tolower (*resolved_path); +#endif return resolved_path; }