319 строки
8.2 KiB
C
319 строки
8.2 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2007 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "opal_config.h"
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SHLWAPI_H
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#include <shlwapi.h>
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#endif
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#include "opal/util/path.h"
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#include "opal/util/os_path.h"
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#include "opal/util/argv.h"
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#include "opal/util/output.h"
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static void path_env_load(char *path, int *pargc, char ***pargv);
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static char *list_env_get(char *var, char **list);
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bool opal_path_is_absolute( const char *path )
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{
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#if defined(__WINDOWS__)
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/* On Windows an absolute path always start with [a-z]:\ or with \\ */
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if( (isalpha(path[0]) && (':' == path[1])) ||
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('\\' == path[0]) && ('\\' == path[1]) ) return true;
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#else
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if( OPAL_PATH_SEP[0] == *path ) {
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return true;
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}
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#endif /* defined(__WINDOWS__) */
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return false;
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}
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/**
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* Locates a file with certain permissions
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*/
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char *opal_path_find(char *fname, char **pathv, int mode, char **envv)
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{
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char *fullpath;
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char *delimit;
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char *env;
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char *pfix;
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int i;
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/* If absolute path is given, return it without searching. */
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if( opal_path_is_absolute(fname) ) {
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return opal_path_access(fname, "", mode);
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}
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/* Initialize. */
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fullpath = NULL;
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i = 0;
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/* Consider each directory until the file is found. Thus, the
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order of directories is important. */
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while (pathv[i] && NULL == fullpath) {
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/* Replace environment variable at the head of the string. */
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if ('$' == *pathv[i]) {
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delimit = strchr(pathv[i], OPAL_PATH_SEP[0]);
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if (delimit) {
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*delimit = '\0';
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}
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env = list_env_get(pathv[i]+1, envv);
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if (delimit) {
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*delimit = OPAL_PATH_SEP[0];
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}
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if (NULL != env) {
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if (!delimit) {
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fullpath = opal_path_access(fname, env, mode);
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} else {
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pfix = (char*) malloc(strlen(env) + strlen(delimit) + 1);
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if (NULL == pfix) {
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return NULL;
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}
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strcpy(pfix, env);
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strcat(pfix, delimit);
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fullpath = opal_path_access(fname, pfix, mode);
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free(pfix);
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}
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}
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}
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else {
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fullpath = opal_path_access(fname, pathv[i], mode);
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}
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i++;
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}
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return opal_make_filename_os_friendly(fullpath);
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}
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/*
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* Locates a file with certain permissions from a list of search paths
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*/
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char *opal_path_findv(char *fname, int mode, char **envv, char *wrkdir)
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{
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char **dirv;
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char *fullpath;
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char *path;
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int dirc;
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int i;
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bool found_dot = false;
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/* Set the local search paths. */
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dirc = 0;
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dirv = NULL;
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if (NULL != (path = list_env_get("PATH", envv))) {
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path_env_load(path, &dirc, &dirv);
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}
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/* Replace the "." path by the working directory. */
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if (NULL != wrkdir) {
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for (i = 0; i < dirc; ++i) {
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if (0 == strcmp(dirv[i], ".")) {
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found_dot = true;
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free(dirv[i]);
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dirv[i] = strdup(wrkdir);
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if (NULL == dirv[i]){
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return NULL;
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}
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}
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}
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}
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/* If we didn't find "." in the path and we have a wrkdir, append
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the wrkdir to the end of the path */
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if (!found_dot && NULL != wrkdir) {
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opal_argv_append(&dirc, &dirv, wrkdir);
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}
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if(NULL == dirv)
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return NULL;
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fullpath = opal_path_find(fname, dirv, mode, envv);
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opal_argv_free(dirv);
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return fullpath;
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}
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/**
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* Forms a complete pathname and checks it for existance and
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* permissions
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*
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* Accepts:
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* -fname File name
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* -path Path prefix
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* -mode Target permissions which must be satisfied
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*
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* Returns:
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* -Full pathname of located file Success
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* -NULL Failure
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*/
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char *opal_path_access(char *fname, char *path, int mode)
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{
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char *fullpath = NULL;
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/* Allocate space for the full pathname. */
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if( NULL == path ) {
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fullpath = opal_os_path( false, fname, NULL );
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} else {
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fullpath = opal_os_path( false, path, fname, NULL );
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}
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if( NULL == fullpath )
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return NULL;
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/* Get status on the full path name to check for existance. Then
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check the permissions. */
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if (access(fullpath, mode)) {
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free(fullpath);
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fullpath = NULL;
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}
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return fullpath;
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}
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/**
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*
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* Loads argument array with $PATH env var.
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*
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* Accepts
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* -path String contiaing the $PATH
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* -argc Pointer to argc
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* -argv Pointer to list of argv
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*/
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static void path_env_load(char *path, int *pargc, char ***pargv)
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{
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char *p;
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char saved;
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if (NULL == path) {
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*pargc = 0;
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return;
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}
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/* Loop through the paths (delimited by PATHENVSEP), adding each
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one to argv. */
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while ('\0' != *path) {
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/* Locate the delimiter. */
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for (p = path; *p && (*p != OPAL_ENV_SEP); ++p) {
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continue;
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}
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/* Add the path. */
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if (p != path) {
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saved = *p;
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*p = '\0';
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opal_argv_append(pargc, pargv, path);
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*p = saved;
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path = p;
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}
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/* Skip past the delimiter, if present. */
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if (*path) {
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++path;
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}
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}
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}
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/**
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* Gets value of variable in list or environment. Looks in the list first
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*
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* Accepts:
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* -var String variable
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* -list Pointer to environment list
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*
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* Returns:
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* -List Pointer to environment list Success
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* -NULL Failure
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*/
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static char *list_env_get(char *var, char **list)
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{
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size_t n;
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if (NULL != list) {
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n = strlen(var);
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while (NULL != *list) {
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if ((0 == strncmp(var, *list, n)) && ('=' == (*list)[n])) {
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return (*list + n + 1);
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}
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++list;
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}
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}
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return getenv(var);
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}
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/**
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* Try to figure out the absolute path based on the application name
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* (usually argv[0]). If the path is already absolute return a copy, if
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* it start with . look into the current directory, if not dig into
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* the $PATH.
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* In case of error or if executable was not found (as an example if
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* the application did a cwd between the start and this call), the
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* function will return NULL. Otherwise, an newly allocated string
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* will be returned.
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*/
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char* opal_find_absolute_path( char* app_name )
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{
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char* abs_app_name;
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if( opal_path_is_absolute(app_name) ) { /* already absolute path */
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abs_app_name = app_name;
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} else if( '.' == app_name[0] ) { /* the app is in the current directory */
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char cwd[PATH_MAX], *pcwd;
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pcwd = getcwd( cwd, PATH_MAX );
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if( NULL == pcwd ) {
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/* too bad there is no way we can get the app absolute name */
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return NULL;
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}
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abs_app_name = opal_os_path( false, pcwd, app_name, NULL );
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} else {
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/* Otherwise try to search for the application in the PATH ... */
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abs_app_name = opal_path_findv( app_name, X_OK, NULL, NULL );
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}
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if( NULL != abs_app_name ) {
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char* resolved_path = (char*)malloc(PATH_MAX);
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#if !defined(__WINDOWS__)
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realpath( abs_app_name, resolved_path );
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#else
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#ifdef HAVE_SHLWAPI_H
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PathCanonicalize(resolved_path, abs_app_name);
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#endif
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#endif /* !defined(__WINDOWS__) */
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if( abs_app_name != app_name ) free(abs_app_name);
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return resolved_path;
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}
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return NULL;
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}
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