fs_nix.cpp

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/***************************************************************************
 *   Copyright (C) 2007-2013 Mike Kinghan, imk@burroingroingjoing.com      *
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 **************************************************************************/

#include "platform.h"


#ifdef NIX

#include "filesys.h"
#include "diagnostic.h"
#include "syserr.h"
#include "path.h"
#include <cstring>
#include <sys/stat.h>
#include <unistd.h>
#include <climits>
#include <cerrno>

using namespace std;
namespace fs {

string real_path(string const & relname)
{
        char buf[PATH_MAX];
        if (!realpath(relname.c_str(),buf)) {
                error_cant_get_realpath() <<  "Can't obtain real path of \""
                          << relname << "\": " << strerror(errno) << emit();
        }
        return buf;
}

string cwd()
{
        char buf[PATH_MAX];
        if (!getcwd(buf,PATH_MAX)) {
                abend_cant_get_cwd() <<  "Can't obtain real path of "
                         "current working directory: " << strerror(errno) << emit();
        }
        return buf;
}

bool is_absolute(std::string pathname)
{
        return !pathname.empty() && pathname[0] == '/';
}

obj_type_t obj_type(string const & name)
{
        obj_type_t type = OBJ_NONE;
        struct stat obj_info;
        int res = lstat(name.c_str(),&obj_info);
        if (!res) {
                if (S_ISLNK(obj_info.st_mode)) {
                        type |= OBJ_SLINK;
                }
                res = stat(name.c_str(),&obj_info);
                if (!res) {
                        if (S_ISREG(obj_info.st_mode)) {
                                type |= OBJ_FILE;
                        } else if (S_ISDIR(obj_info.st_mode)) {
                                type |= OBJ_DIR;
                        }
                }
        }
        return type;
}

void make_dir(std::string const & abs_path, bool recursive)
{
        mode_t mode = S_IRWXU | S_IXGRP | S_IRGRP | S_IXOTH | S_IROTH;
        int result = 0;
        if (recursive) {
                path_t path(abs_path);
                int elements = path.elements() - 1;
                errno = 0;
                for (int element = 0; !result && element < elements;) {
                        string prefix = path.segment(0,++element).c_str();
                        result =  mkdir(prefix.c_str(),mode);
                        result *= (errno != EEXIST && errno != EISDIR);
                }
        }
        if (!result) {
                result = mkdir(abs_path.c_str(),mode);
                result *= (errno != EEXIST && errno != EISDIR);
        }
        if (result) {
                abend_cant_create_dir() << "Can't create directory \"" << abs_path
                        << "\": " << system_error_message(errno) << emit();
        }
}

permissions get_permissions(std::string const & filename)
{
        permissions p = -1;
        struct stat obj_info;
        int res = stat(filename.c_str(),&obj_info);
        if (!res) {
                p = obj_info.st_mode & 0777;
        }
        return p;
}

int set_permissions(std::string const & filename, permissions p)
{
        return chmod(filename.c_str(),p & 0777);
}

} // namespace fs

#endif


/* EOF*/