search.c

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/***************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (directui@nokia.com)
**
** This file is part of applauncherd
**
** If you have questions regarding the use of this file, please contact
** Nokia at directui@nokia.com.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation
** and appearing in the file LICENSE.LGPL included in the packaging
** of this file.
**
****************************************************************************/
 
#define _GNU_SOURCE
 
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
 
#include "report.h"
#include "search.h"
 
static char* merge_paths(const char *base_path, const char *rel_path)
{
    char *path;
 
    if (asprintf(&path, "%s%s%s", base_path,
                 (base_path[strlen(base_path) - 1] == '/' ? "" : "/"),
                 rel_path) < 0) {
        die(1, "allocating merge path buffer");
    }
    return path;
}
 
char* search_program(const char *progname)
{
    char *launch = NULL;
    char *cwd;
 
    if (progname[0] == '/') {
        launch = strdup(progname);
        if (!launch) {
            die(1, "allocating program name buffer");
        }
    } else if (strchr(progname, '/') != NULL) {
        cwd = get_current_dir_name();
        launch = merge_paths(cwd, progname);
        free(cwd);
    } else {
        char *path = getenv("PATH");
        char *saveptr = NULL;
        char *token;
 
        if (path == NULL) {
            die(1, "could not get PATH environment variable");
        }
        path = strdup(path);
 
        for (token = strtok_r(path, ":", &saveptr); token != NULL; token = strtok_r(NULL, ":", &saveptr)) {
            launch = merge_paths(token, progname);
 
            if (access(launch, X_OK) == 0)
                break;
 
            free(launch);
            launch = NULL;
        }
 
        free(path);
 
        if (launch == NULL) {
            die(1, "could not locate program \"%s\" to launch \n", progname);
        }
 
        if (launch[0] != '/') {
            char *relative = launch;
 
            cwd = get_current_dir_name();
            launch = merge_paths(cwd, relative);
 
            free(cwd);
            free(relative);
        }
    }
 
    return launch;
}