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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 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 * Checks for end of file.
115 * \returns `TRUE` on end-of-file
118 * There are only two callers for this function, while there are ~20 direct
119 * calls to feof(). Probably this is unnecessary.
121 gmx_bool gmx_eof(FILE *fp);
124 * Makes a backup of file if the file exists.
126 * \returns `FALSE` if there was a problem.
128 gmx_bool make_backup(const char *file);
131 * Opens a file, with \Gromacs-specific additions.
133 * If the file is in compressed format, opens a pipe which uncompresses the
134 * file on the fly. For this to work, gmx_ffclose() and frewind() should
135 * always be used for files opened with gmx_ffopen() instead of fclose() and
136 * rewind(). For compressed files, the \p file parameter should be passed
137 * without the compressed extension; if that file is not found, then a few
138 * compression extensions are tried.
139 * Creates a backup if a file opened for writing already exists before
141 * A fatal error results if the file cannot be opened, for whatever reason.
143 FILE *gmx_ffopen(const char *file, const char *mode);
145 /** Closes a file opened with gmx_ffopen(). */
146 int gmx_ffclose(FILE *fp);
149 * Wraps rewind() for files opened with gmx_ffopen().
151 * A fatal error results if this function is called for a pipe (a compressed
154 void frewind(FILE *fp);
156 /** OS-independent 64-bit fseek(). */
157 int gmx_fseek(FILE *stream, gmx_off_t offset, int whence);
159 /** OS-independent 64-bit ftell(). */
160 gmx_off_t gmx_ftell(FILE *stream);
163 * Finds full path for a library file.
165 * Searches first in the current directory, and then in the configured library
167 * Fatal error results if the file is not found in any location.
168 * The caller is responsible of freeing the returned string.
170 char *gmxlibfn(const char *file);
173 * Opens a library file for reading.
175 * Works as gmxlibfn(), except that it opens the file and returns a file
178 FILE *libopen(const char *file);
181 * More flexible gmxlibfn().
183 * Works as gmxlibfn(), but provides control whether the current working
184 * directory is searched or not, and whether a missing file is a fatal error or
187 char *low_gmxlibfn(const char *file, gmx_bool bAddCWD, gmx_bool bFatal);
190 * Alternative for libopen() that optionally does not exit.
192 * Works as libopen(), but provides control whether a missing file is a fatal
195 FILE *low_libopen(const char *file, gmx_bool bFatal);
197 /** Opaque data type to list directories. */
198 typedef struct gmx_directory *gmx_directory_t;
201 * Opens a directory for reading.
203 * \param[out] p_gmxdir Handle to the opened directory.
204 * \param[in] dirname Path to directory to open.
205 * \returns 0 on success.
208 gmx_directory_open(gmx_directory_t *p_gmxdir, const char *dirname);
211 * Gets next file in a directory.
213 * Given an initialized gmx_directory_t, if there are more files in
214 * the directory this routine returns 0 and write the next name
215 * into the USER-PROVIDED buffer \p name. The last argument is the max
216 * number of characters that will be written. Just as strncpy(), the
217 * string will NOT be terminated it it is longer than \p maxlength_name.
220 gmx_directory_nextfile(gmx_directory_t gmxdir, char *name, int maxlength_name);
222 /** Releases all data for a directory structure. */
224 gmx_directory_close(gmx_directory_t gmxdir);
228 * Creates unique name for temp file (wrapper around mkstemp).
230 * \p buf should be at least 7 bytes long
232 void gmx_tmpnam(char *buf);
235 * OS-independent rename().
237 * Renames/moves a file atomically, if the OS makes that available.
239 int gmx_file_rename(const char *oldname, const char *newname);
242 * Copies a file (data only) oldname to newname.
244 * If \p copy_if_empty is `FALSE`, the file won't be copied if it's empty.
246 int gmx_file_copy(const char *oldname, const char *newname, gmx_bool copy_if_empty);
249 * OS-independent fsync().
251 * Only use this during checkpointing!
253 int gmx_fsync(FILE *fp);
256 * OS-independent chdir().
258 * Exits with a fatal error if changing the directory fails.
260 void gmx_chdir(const char *directory);
262 * OS-independent getcwd().
264 * Exits with a fatal error if the call fails.
266 void gmx_getcwd(char *buffer, size_t size);