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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 for output files (which is default) for debugging
99 * This only has effect on files opened with gmx_ffopen().
101 void gmx_disable_file_buffering(void);
104 * Check whether a path exists.
106 * \returns `TRUE` when \p fname exists.
108 * Note that this returns `TRUE` even if \p fname is a directory instead of a
111 gmx_bool gmx_fexist(const char *fname);
114 * Makes a backup of file if the file exists.
116 * \returns `FALSE` if there was a problem.
118 gmx_bool make_backup(const char *file);
121 * Opens a file, with \Gromacs-specific additions.
123 * If the file is in compressed format, opens a pipe which uncompresses the
124 * file on the fly. For this to work, gmx_ffclose() and frewind() should
125 * always be used for files opened with gmx_ffopen() instead of fclose() and
126 * rewind(). For compressed files, the \p file parameter should be passed
127 * without the compressed extension; if that file is not found, then a few
128 * compression extensions are tried.
129 * Creates a backup if a file opened for writing already exists before
131 * A fatal error results if the file cannot be opened, for whatever reason.
133 FILE *gmx_ffopen(const char *file, const char *mode);
135 /** Closes a file opened with gmx_ffopen(). */
136 int gmx_ffclose(FILE *fp);
139 * Wraps rewind() for files opened with gmx_ffopen().
141 * A fatal error results if this function is called for a pipe (a compressed
144 void frewind(FILE *fp);
146 /** OS-independent 64-bit fseek(). */
147 int gmx_fseek(FILE *stream, gmx_off_t offset, int whence);
149 /** OS-independent 64-bit ftell(). */
150 gmx_off_t gmx_ftell(FILE *stream);
153 * Finds full path for a library file.
155 * Searches first in the current directory, and then in the configured library
157 * Fatal error results if the file is not found in any location.
158 * The caller is responsible of freeing the returned string.
160 char *gmxlibfn(const char *file);
163 * Opens a library file for reading.
165 * Works as gmxlibfn(), except that it opens the file and returns a file
168 FILE *libopen(const char *file);
171 * More flexible gmxlibfn().
173 * Works as gmxlibfn(), but provides control whether the current working
174 * directory is searched or not, and whether a missing file is a fatal error or
177 char *low_gmxlibfn(const char *file, gmx_bool bAddCWD, gmx_bool bFatal);
180 * Alternative for libopen() that optionally does not exit.
182 * Works as libopen(), but provides control whether a missing file is a fatal
185 FILE *low_libopen(const char *file, gmx_bool bFatal);
187 /** Opaque data type to list directories. */
188 typedef struct gmx_directory *gmx_directory_t;
191 * Opens a directory for reading.
193 * \param[out] p_gmxdir Handle to the opened directory.
194 * \param[in] dirname Path to directory to open.
195 * \returns 0 on success.
198 gmx_directory_open(gmx_directory_t *p_gmxdir, const char *dirname);
201 * Gets next file in a directory.
203 * Given an initialized gmx_directory_t, if there are more files in
204 * the directory this routine returns 0 and write the next name
205 * into the USER-PROVIDED buffer \p name. The last argument is the max
206 * number of characters that will be written. Just as strncpy(), the
207 * string will NOT be terminated it it is longer than \p maxlength_name.
210 gmx_directory_nextfile(gmx_directory_t gmxdir, char *name, int maxlength_name);
212 /** Releases all data for a directory structure. */
214 gmx_directory_close(gmx_directory_t gmxdir);
218 * Creates unique name for temp file (wrapper around mkstemp).
220 * \p buf should be at least 7 bytes long
222 void gmx_tmpnam(char *buf);
225 * OS-independent rename().
227 * Renames/moves a file atomically, if the OS makes that available.
229 int gmx_file_rename(const char *oldname, const char *newname);
232 * Copies a file (data only) oldname to newname.
234 * If \p copy_if_empty is `FALSE`, the file won't be copied if it's empty.
236 int gmx_file_copy(const char *oldname, const char *newname, gmx_bool copy_if_empty);
239 * OS-independent fsync().
241 * Only use this during checkpointing!
243 int gmx_fsync(FILE *fp);
246 * OS-independent chdir().
248 * Exits with a fatal error if changing the directory fails.
250 void gmx_chdir(const char *directory);
252 * OS-independent getcwd().
254 * Exits with a fatal error if the call fails.
256 void gmx_getcwd(char *buffer, size_t size);