diff options
Diffstat (limited to 'unix/tclUnixFile.c')
| -rw-r--r-- | unix/tclUnixFile.c | 528 |
1 files changed, 528 insertions, 0 deletions
diff --git a/unix/tclUnixFile.c b/unix/tclUnixFile.c new file mode 100644 index 0000000..eb11006 --- /dev/null +++ b/unix/tclUnixFile.c @@ -0,0 +1,528 @@ +/* + * tclUnixFile.c -- + * + * This file contains wrappers around UNIX file handling functions. + * These wrappers mask differences between Windows and UNIX. + * + * Copyright (c) 1995 Sun Microsystems, Inc. + * + * See the file "license.terms" for information on usage and redistribution + * of this file, and for a DISCLAIMER OF ALL WARRANTIES. + * + * SCCS: @(#) tclUnixFile.c 1.48 97/07/07 16:38:11 + */ + +#include "tclInt.h" +#include "tclPort.h" + +/* + * The variable below caches the name of the current working directory + * in order to avoid repeated calls to getcwd. The string is malloc-ed. + * NULL means the cache needs to be refreshed. + */ + +static char *currentDir = NULL; +static int currentDirExitHandlerSet = 0; + +/* + * The variable below is set if the exit routine for deleting the string + * containing the executable name has been registered. + */ + +static int executableNameExitHandlerSet = 0; + +extern pid_t waitpid _ANSI_ARGS_((pid_t pid, int *stat_loc, int options)); + +/* + * Static routines for this file: + */ + +static void FreeCurrentDir _ANSI_ARGS_((ClientData clientData)); +static void FreeExecutableName _ANSI_ARGS_((ClientData clientData)); + +/* + *---------------------------------------------------------------------- + * + * FreeCurrentDir -- + * + * Frees the string stored in the currentDir variable. This routine + * is registered as an exit handler and will be called during shutdown. + * + * Results: + * None. + * + * Side effects: + * Frees the memory occuppied by the currentDir value. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +static void +FreeCurrentDir(clientData) + ClientData clientData; /* Not used. */ +{ + if (currentDir != (char *) NULL) { + ckfree(currentDir); + currentDir = (char *) NULL; + currentDirExitHandlerSet = 0; + } +} + +/* + *---------------------------------------------------------------------- + * + * FreeExecutableName -- + * + * Frees the string stored in the tclExecutableName variable. This + * routine is registered as an exit handler and will be called + * during shutdown. + * + * Results: + * None. + * + * Side effects: + * Frees the memory occuppied by the tclExecutableName value. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +static void +FreeExecutableName(clientData) + ClientData clientData; /* Not used. */ +{ + if (tclExecutableName != (char *) NULL) { + ckfree(tclExecutableName); + tclExecutableName = (char *) NULL; + } +} + +/* + *---------------------------------------------------------------------- + * + * TclChdir -- + * + * Change the current working directory. + * + * Results: + * The result is a standard Tcl result. If an error occurs and + * interp isn't NULL, an error message is left in interp->result. + * + * Side effects: + * The working directory for this application is changed. Also + * the cache maintained used by TclGetCwd is deallocated and + * set to NULL. + * + *---------------------------------------------------------------------- + */ + +int +TclChdir(interp, dirName) + Tcl_Interp *interp; /* If non NULL, used for error reporting. */ + char *dirName; /* Path to new working directory. */ +{ + if (currentDir != NULL) { + ckfree(currentDir); + currentDir = NULL; + } + if (chdir(dirName) != 0) { + if (interp != NULL) { + Tcl_AppendResult(interp, "couldn't change working directory to \"", + dirName, "\": ", Tcl_PosixError(interp), (char *) NULL); + } + return TCL_ERROR; + } + return TCL_OK; +} + +/* + *---------------------------------------------------------------------- + * + * TclGetCwd -- + * + * Return the path name of the current working directory. + * + * Results: + * The result is the full path name of the current working + * directory, or NULL if an error occurred while figuring it out. + * The returned string is owned by the TclGetCwd routine and must + * not be freed by the caller. If an error occurs and interp + * isn't NULL, an error message is left in interp->result. + * + * Side effects: + * The path name is cached to avoid having to recompute it + * on future calls; if it is already cached, the cached + * value is returned. + * + *---------------------------------------------------------------------- + */ + +char * +TclGetCwd(interp) + Tcl_Interp *interp; /* If non NULL, used for error reporting. */ +{ + char buffer[MAXPATHLEN+1]; + + if (currentDir == NULL) { + if (!currentDirExitHandlerSet) { + currentDirExitHandlerSet = 1; + Tcl_CreateExitHandler(FreeCurrentDir, (ClientData) NULL); + } +#ifdef USEGETWD + if ((int)getwd(buffer) == (int)NULL) { + if (interp != NULL) { + Tcl_AppendResult(interp, + "error getting working directory name: ", + buffer, (char *)NULL); + } + return NULL; + } +#else + if (getcwd(buffer, MAXPATHLEN+1) == NULL) { + if (interp != NULL) { + if (errno == ERANGE) { + Tcl_SetResult(interp, + "working directory name is too long", + TCL_STATIC); + } else { + Tcl_AppendResult(interp, + "error getting working directory name: ", + Tcl_PosixError(interp), (char *) NULL); + } + } + return NULL; + } +#endif + currentDir = (char *) ckalloc((unsigned) (strlen(buffer) + 1)); + strcpy(currentDir, buffer); + } + return currentDir; +} + +/* + *---------------------------------------------------------------------- + * + * Tcl_FindExecutable -- + * + * This procedure computes the absolute path name of the current + * application, given its argv[0] value. + * + * Results: + * None. + * + * Side effects: + * The variable tclExecutableName gets filled in with the file + * name for the application, if we figured it out. If we couldn't + * figure it out, Tcl_FindExecutable is set to NULL. + * + *---------------------------------------------------------------------- + */ + +void +Tcl_FindExecutable(argv0) + char *argv0; /* The value of the application's argv[0]. */ +{ + char *name, *p, *cwd; + Tcl_DString buffer; + int length; + struct stat statBuf; + + Tcl_DStringInit(&buffer); + if (tclExecutableName != NULL) { + ckfree(tclExecutableName); + tclExecutableName = NULL; + } + + name = argv0; + for (p = name; *p != 0; p++) { + if (*p == '/') { + /* + * The name contains a slash, so use the name directly + * without doing a path search. + */ + + goto gotName; + } + } + + p = getenv("PATH"); + if (p == NULL) { + /* + * There's no PATH environment variable; use the default that + * is used by sh. + */ + + p = ":/bin:/usr/bin"; + } + + /* + * Search through all the directories named in the PATH variable + * to see if argv[0] is in one of them. If so, use that file + * name. + */ + + while (*p != 0) { + while (isspace(UCHAR(*p))) { + p++; + } + name = p; + while ((*p != ':') && (*p != 0)) { + p++; + } + Tcl_DStringSetLength(&buffer, 0); + if (p != name) { + Tcl_DStringAppend(&buffer, name, p-name); + if (p[-1] != '/') { + Tcl_DStringAppend(&buffer, "/", 1); + } + } + Tcl_DStringAppend(&buffer, argv0, -1); + if ((access(Tcl_DStringValue(&buffer), X_OK) == 0) + && (stat(Tcl_DStringValue(&buffer), &statBuf) == 0) + && S_ISREG(statBuf.st_mode)) { + name = Tcl_DStringValue(&buffer); + goto gotName; + } + if (*p == 0) { + break; + } + p++; + } + goto done; + + /* + * If the name starts with "/" then just copy it to tclExecutableName. + */ + + gotName: + if (name[0] == '/') { + tclExecutableName = (char *) ckalloc((unsigned) (strlen(name) + 1)); + strcpy(tclExecutableName, name); + goto done; + } + + /* + * The name is relative to the current working directory. First + * strip off a leading "./", if any, then add the full path name of + * the current working directory. + */ + + if ((name[0] == '.') && (name[1] == '/')) { + name += 2; + } + cwd = TclGetCwd((Tcl_Interp *) NULL); + if (cwd == NULL) { + tclExecutableName = NULL; + goto done; + } + length = strlen(cwd); + tclExecutableName = (char *) ckalloc((unsigned) + (length + strlen(name) + 2)); + strcpy(tclExecutableName, cwd); + tclExecutableName[length] = '/'; + strcpy(tclExecutableName + length + 1, name); + + done: + Tcl_DStringFree(&buffer); + + if (!executableNameExitHandlerSet) { + executableNameExitHandlerSet = 1; + Tcl_CreateExitHandler(FreeExecutableName, (ClientData) NULL); + } +} + +/* + *---------------------------------------------------------------------- + * + * TclGetUserHome -- + * + * This function takes the passed in user name and finds the + * corresponding home directory specified in the password file. + * + * Results: + * The result is a pointer to a static string containing + * the new name. If there was an error in processing the + * user name then the return value is NULL. Otherwise the + * result is stored in bufferPtr, and the caller must call + * Tcl_DStringFree(bufferPtr) to free the result. + * + * Side effects: + * Information may be left in bufferPtr. + * + *---------------------------------------------------------------------- + */ + +char * +TclGetUserHome(name, bufferPtr) + char *name; /* User name to use to find home directory. */ + Tcl_DString *bufferPtr; /* May be used to hold result. Must not hold + * anything at the time of the call, and need + * not even be initialized. */ +{ + struct passwd *pwPtr; + + pwPtr = getpwnam(name); + if (pwPtr == NULL) { + endpwent(); + return NULL; + } + Tcl_DStringInit(bufferPtr); + Tcl_DStringAppend(bufferPtr, pwPtr->pw_dir, -1); + endpwent(); + return bufferPtr->string; +} + +/* + *---------------------------------------------------------------------- + * + * TclMatchFiles -- + * + * This routine is used by the globbing code to search a + * directory for all files which match a given pattern. + * + * Results: + * If the tail argument is NULL, then the matching files are + * added to the interp->result. Otherwise, TclDoGlob is called + * recursively for each matching subdirectory. The return value + * is a standard Tcl result indicating whether an error occurred + * in globbing. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +TclMatchFiles(interp, separators, dirPtr, pattern, tail) + Tcl_Interp *interp; /* Interpreter to receive results. */ + char *separators; /* Path separators to pass to TclDoGlob. */ + Tcl_DString *dirPtr; /* Contains path to directory to search. */ + char *pattern; /* Pattern to match against. */ + char *tail; /* Pointer to end of pattern. */ +{ + char *dirName, *patternEnd = tail; + char savedChar = 0; /* Initialization needed only to prevent + * compiler warning from gcc. */ + DIR *d; + struct stat statBuf; + struct dirent *entryPtr; + int matchHidden; + int result = TCL_OK; + int baseLength = Tcl_DStringLength(dirPtr); + + /* + * Make sure that the directory part of the name really is a + * directory. If the directory name is "", use the name "." + * instead, because some UNIX systems don't treat "" like "." + * automatically. Keep the "" for use in generating file names, + * otherwise "glob foo.c" would return "./foo.c". + */ + + if (dirPtr->string[0] == '\0') { + dirName = "."; + } else { + dirName = dirPtr->string; + } + if ((stat(dirName, &statBuf) != 0) || !S_ISDIR(statBuf.st_mode)) { + return TCL_OK; + } + + /* + * Check to see if the pattern needs to compare with hidden files. + */ + + if ((pattern[0] == '.') + || ((pattern[0] == '\\') && (pattern[1] == '.'))) { + matchHidden = 1; + } else { + matchHidden = 0; + } + + /* + * Now open the directory for reading and iterate over the contents. + */ + + d = opendir(dirName); + if (d == NULL) { + Tcl_ResetResult(interp); + + /* + * Strip off a trailing '/' if necessary, before reporting the error. + */ + + if (baseLength > 0) { + savedChar = dirPtr->string[baseLength-1]; + if (savedChar == '/') { + dirPtr->string[baseLength-1] = '\0'; + } + } + Tcl_AppendResult(interp, "couldn't read directory \"", + dirPtr->string, "\": ", Tcl_PosixError(interp), (char *) NULL); + if (baseLength > 0) { + dirPtr->string[baseLength-1] = savedChar; + } + return TCL_ERROR; + } + + /* + * Clean up the end of the pattern and the tail pointer. Leave + * the tail pointing to the first character after the path separator + * following the pattern, or NULL. Also, ensure that the pattern + * is null-terminated. + */ + + if (*tail == '\\') { + tail++; + } + if (*tail == '\0') { + tail = NULL; + } else { + tail++; + } + savedChar = *patternEnd; + *patternEnd = '\0'; + + while (1) { + entryPtr = readdir(d); + if (entryPtr == NULL) { + break; + } + + /* + * Don't match names starting with "." unless the "." is + * present in the pattern. + */ + + if (!matchHidden && (*entryPtr->d_name == '.')) { + continue; + } + + /* + * Now check to see if the file matches. If there are more + * characters to be processed, then ensure matching files are + * directories before calling TclDoGlob. Otherwise, just add + * the file to the result. + */ + + if (Tcl_StringMatch(entryPtr->d_name, pattern)) { + Tcl_DStringSetLength(dirPtr, baseLength); + Tcl_DStringAppend(dirPtr, entryPtr->d_name, -1); + if (tail == NULL) { + Tcl_AppendElement(interp, dirPtr->string); + } else if ((stat(dirPtr->string, &statBuf) == 0) + && S_ISDIR(statBuf.st_mode)) { + Tcl_DStringAppend(dirPtr, "/", 1); + result = TclDoGlob(interp, separators, dirPtr, tail); + if (result != TCL_OK) { + break; + } + } + } + } + *patternEnd = savedChar; + + closedir(d); + return result; +} |