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