2 * This file is part of the GROMACS molecular simulation package.
4 * Copyright (c) 1991-2000, University of Groningen, The Netherlands.
5 * Copyright (c) 2001-2004, The GROMACS development team.
6 * Copyright (c) 2013,2014, by the GROMACS development team, led by
7 * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
8 * and including many others, as listed in the AUTHORS file in the
9 * top-level source directory and at http://www.gromacs.org.
11 * GROMACS is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public License
13 * as published by the Free Software Foundation; either version 2.1
14 * of the License, or (at your option) any later version.
16 * GROMACS is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with GROMACS; if not, see
23 * http://www.gnu.org/licenses, or write to the Free Software Foundation,
24 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 * If you want to redistribute modifications to GROMACS, please
27 * consider that scientific software is very special. Version
28 * control is crucial - bugs must be traceable. We will be happy to
29 * consider code for inclusion in the official distribution, but
30 * derived work must not be called official GROMACS. Details are found
31 * in the README & COPYING files - if they are missing, get the
32 * official version at http://www.gromacs.org.
34 * To help us fund GROMACS development, we humbly ask that you cite
35 * the research papers on the package. Check out http://www.gromacs.org.
39 * Low-level wrappers for OS-specific file handling with some \Gromacs
43 * \ingroup module_utility
45 #ifndef GMX_UTILITY_FUTIL_H
46 #define GMX_UTILITY_FUTIL_H
51 #include "basedefinitions.h"
60 #include "gmx_header_config.h"
61 /*! \def DIR_SEPARATOR
63 * Directory separator on this OS.
65 * Native Windows uses backslash path separators (but accepts also slashes).
66 * Cygwin and most other systems use slash.
69 * Get rid of this (Redmine #950), or at least remove this from an installed
70 * header. It is not necessary for constructing paths on the systems that it
71 * currently supports, and is not reliable in parsing input paths either, since
72 * Windows needs to accept both instead of only DIR_SEPARATOR.
74 #ifdef GMX_NATIVE_WINDOWS
75 #define DIR_SEPARATOR '\\'
77 #define DIR_SEPARATOR '/'
82 * Maximum path length, if the OS provides one, otherwise a fixed constant.
85 # define GMX_PATH_MAX PATH_MAX
86 #elif defined MAX_PATH
87 # define GMX_PATH_MAX MAX_PATH
89 # define GMX_PATH_MAX 4096
92 /** \Gromacs definition to use instead of `off_t`. */
93 typedef gmx_int64_t gmx_off_t;
96 * Turn off buffering of files (which is default) for debugging purposes.
98 * This only has effect on files opened with gmx_ffopen().
100 void no_buffers(void);
103 * Check whether a path exists.
105 * \returns `TRUE` when \p fname exists.
107 * Note that this returns `TRUE` even if \p fname is a directory instead of a
110 gmx_bool gmx_fexist(const char *fname);
113 * Makes a backup of file if the file exists.
115 * \returns `FALSE` if there was a problem.
117 gmx_bool make_backup(const char *file);
120 * Opens a file, with \Gromacs-specific additions.
122 * If the file is in compressed format, opens a pipe which uncompresses the
123 * file on the fly. For this to work, gmx_ffclose() and frewind() should
124 * always be used for files opened with gmx_ffopen() instead of fclose() and
125 * rewind(). For compressed files, the \p file parameter should be passed
126 * without the compressed extension; if that file is not found, then a few
127 * compression extensions are tried.
128 * Creates a backup if a file opened for writing already exists before
130 * A fatal error results if the file cannot be opened, for whatever reason.
132 FILE *gmx_ffopen(const char *file, const char *mode);
134 /** Closes a file opened with gmx_ffopen(). */
135 int gmx_ffclose(FILE *fp);
138 * Wraps rewind() for files opened with gmx_ffopen().
140 * A fatal error results if this function is called for a pipe (a compressed
143 void frewind(FILE *fp);
145 /** OS-independent 64-bit fseek(). */
146 int gmx_fseek(FILE *stream, gmx_off_t offset, int whence);
148 /** OS-independent 64-bit ftell(). */
149 gmx_off_t gmx_ftell(FILE *stream);
152 * Finds full path for a library file.
154 * Searches first in the current directory, and then in the configured library
156 * Fatal error results if the file is not found in any location.
157 * The caller is responsible of freeing the returned string.
159 char *gmxlibfn(const char *file);
162 * Opens a library file for reading.
164 * Works as gmxlibfn(), except that it opens the file and returns a file
167 FILE *libopen(const char *file);
170 * More flexible gmxlibfn().
172 * Works as gmxlibfn(), but provides control whether the current working
173 * directory is searched or not, and whether a missing file is a fatal error or
176 char *low_gmxlibfn(const char *file, gmx_bool bAddCWD, gmx_bool bFatal);
179 * Alternative for libopen() that optionally does not exit.
181 * Works as libopen(), but provides control whether a missing file is a fatal
184 FILE *low_libopen(const char *file, gmx_bool bFatal);
186 /** Opaque data type to list directories. */
187 typedef struct gmx_directory *gmx_directory_t;
190 * Opens a directory for reading.
192 * \param[out] p_gmxdir Handle to the opened directory.
193 * \param[in] dirname Path to directory to open.
194 * \returns 0 on success.
197 gmx_directory_open(gmx_directory_t *p_gmxdir, const char *dirname);
200 * Gets next file in a directory.
202 * Given an initialized gmx_directory_t, if there are more files in
203 * the directory this routine returns 0 and write the next name
204 * into the USER-PROVIDED buffer \p name. The last argument is the max
205 * number of characters that will be written. Just as strncpy(), the
206 * string will NOT be terminated it it is longer than \p maxlength_name.
209 gmx_directory_nextfile(gmx_directory_t gmxdir, char *name, int maxlength_name);
211 /** Releases all data for a directory structure. */
213 gmx_directory_close(gmx_directory_t gmxdir);
217 * Creates unique name for temp file (wrapper around mkstemp).
219 * \p buf should be at least 7 bytes long
221 void gmx_tmpnam(char *buf);
224 * OS-independent rename().
226 * Renames/moves a file atomically, if the OS makes that available.
228 int gmx_file_rename(const char *oldname, const char *newname);
231 * Copies a file (data only) oldname to newname.
233 * If \p copy_if_empty is `FALSE`, the file won't be copied if it's empty.
235 int gmx_file_copy(const char *oldname, const char *newname, gmx_bool copy_if_empty);
238 * OS-independent fsync().
240 * Only use this during checkpointing!
242 int gmx_fsync(FILE *fp);
245 * OS-independent chdir().
247 * Exits with a fatal error if changing the directory fails.
249 void gmx_chdir(const char *directory);
251 * OS-independent getcwd().
253 * Exits with a fatal error if the call fails.
255 void gmx_getcwd(char *buffer, size_t size);