include/futil.h

   1 /*
   2  *
   3  *                This source code is part of
   4  *
   5  *                 G   R   O   M   A   C   S
   6  *
   7  *          GROningen MAchine for Chemical Simulations
   8  *
   9  *                        VERSION 3.2.0
  10  * Written by David van der Spoel, Erik Lindahl, Berk Hess, and others.
  11  * Copyright (c) 1991-2000, University of Groningen, The Netherlands.
  12  * Copyright (c) 2001-2004, The GROMACS development team,
  13  * check out http://www.gromacs.org for more information.
  14
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * If you want to redistribute modifications, please consider that
  21  * scientific software is very special. Version control is crucial -
  22  * bugs must be traceable. We will be happy to consider code for
  23  * inclusion in the official distribution, but derived work must not
  24  * be called official GROMACS. Details are found in the README & COPYING
  25  * files - if they are missing, get the official version at www.gromacs.org.
  26  *
  27  * To help us fund GROMACS development, we humbly ask that you cite
  28  * the papers on the package - you can find them in the top README file.
  29  *
  30  * For more info, check our website at http://www.gromacs.org
  31  *
  32  * And Hey:
  33  * Gromacs Runs On Most of All Computer Systems
  34  */
  35
  36 #ifndef _futil_h
  37 #define _futil_h
  38
  39 #include <stdio.h>
  40 #include "typedefs.h"
  41
  42 #ifdef __cplusplus
  43 extern "C" {
  44 #endif
  45 #if 0
  46 }
  47 #endif
  48
  49 /* Native windows uses backslash path separators.
  50  * Cygwin and everybody else in the world use slash.
  51  * When reading the PATH environment variable, Unix separates entries
  52  * with colon, while windows uses semicolon.
  53  */
  54 #include "gmx_header_config.h"
  55 #ifdef GMX_NATIVE_WINDOWS
  56 #define DIR_SEPARATOR '\\'
  57 #define PATH_SEPARATOR ";"
  58 #else
  59 #define DIR_SEPARATOR '/'
  60 #define PATH_SEPARATOR ":"
  61 #endif
  62
  63
  64 /* Now get the maximum path size. */
  65 #ifdef PATH_MAX
  66 #  define GMX_PATH_MAX PATH_MAX
  67 #elif defined MAX_PATH
  68 #  define GMX_PATH_MAX MAX_PATH
  69 #else
  70 #  define GMX_PATH_MAX 4096
  71 #endif
  72
  73
  74 #ifdef HAVE_FSEEKO
  75    typedef off_t              gmx_off_t;
  76 #  define SIZEOF_GMX_OFF_T   SIZEOF_OFF_T
  77 #elif defined HAVE__FSEEKI64
  78    typedef __int64            gmx_off_t;
  79 #  define SIZEOF_GMX_OFF_T   8
  80 #else
  81    /* Almost certainly 64 bits, and guaranteed to be available */
  82    typedef gmx_large_int_t    gmx_off_t;
  83 #  define SIZEOF_GMX_OFF_T   SIZEOF_GMX_LARGE_INT
  84 #endif
  85
  86
  87
  88 void no_buffers(void);
  89 /* Turn off buffering of files (which is default) for debugging purposes */
  90
  91 gmx_bool gmx_fexist(const char *fname);
  92 /* Return TRUE when fname exists, FALSE otherwise */
  93
  94 gmx_bool gmx_fexist_master(const char *fname, t_commrec *cr);
  95 /* Return TRUE when fname exists, FALSE otherwise, bcast from master to others */
  96
  97 gmx_bool gmx_eof(FILE *fp);
  98 /* Return TRUE on end-of-file, FALSE otherwise */
  99
 100 gmx_bool is_pipe(FILE *fp);
 101 /* Check whether the file (opened by ffopen) is a pipe */
 102
 103 /*  Make a backup of file if necessary.
 104     Return false if there was a problem.
 105 */
 106 gmx_bool make_backup(const char * file);
 107
 108 FILE *ffopen(const char *file, const char *mode);
 109 /* Return a valid file pointer when successful, exits otherwise
 110  * If the file is in compressed format, open a pipe which uncompresses
 111  * the file! Therefore, files must be closed with ffclose (see below)
 112  */
 113
 114 int ffclose(FILE *fp);
 115 /* Close files or pipes */
 116
 117
 118 void frewind(FILE *fp);
 119 /* Does not rewind pipes, but does so for normal files */
 120
 121 #define rewind frewind
 122
 123
 124 int gmx_fseek(FILE *stream, gmx_off_t offset, int whence);
 125 /* OS-independent fseek. 64-bit when available */
 126
 127 gmx_off_t gmx_ftell(FILE *stream);
 128 /* OS-independent fseek. 64-bit when available. */
 129
 130
 131 gmx_bool is_pipe(FILE *fp);
 132
 133 char *gmxlibfn(const char *file);
 134 /* allocates and returns a string with the full file name for a library file */
 135
 136 FILE *libopen(const char *file);
 137 /* Open a library file for reading. This looks in the current directory
 138  * first, and then in the library directory. If the file is not found,
 139  * it terminates with a fatal_error
 140  */
 141
 142 /* Opaque data type to list directories */
 143 typedef struct gmx_directory *
 144 gmx_directory_t;
 145
 146 /* Open a directory for reading. The first argument should be a pointer
 147  * to a declared gmx_directory_t variable. Returns 0 on success.
 148  */
 149 int
 150 gmx_directory_open(gmx_directory_t *p_gmxdir,const char *dirname);
 151
 152
 153 /* Given an initialized gmx_directory_t, if there are more files in
 154  * the directory this routine returns 0 and write the next name
 155  * into the USER-PROVIDED buffer name. The last argument is the max
 156  * number of characters that will be written. Just as strncpy, the
 157  * string will NOT be terminated it it is longer than maxlength_name.
 158  */
 159 int
 160 gmx_directory_nextfile(gmx_directory_t gmxdir,char *name,int maxlength_name);
 161
 162 /* Release all data for a directory structure */
 163 int
 164 gmx_directory_close(gmx_directory_t gmxdir);
 165
 166
 167
 168 gmx_bool get_libdir(char *libdir);
 169
 170 char *low_gmxlibfn(const char *file,gmx_bool bAddCWD,gmx_bool bFatal);
 171
 172 FILE *low_libopen(const char *file,gmx_bool bFatal);
 173 /* The same as the above, but does not terminate if (!bFatal) */
 174
 175 /* Create unique name for temp file (wrapper around mkstemp).
 176  * Buf should be at least 7 bytes long
 177  */
 178 void gmx_tmpnam(char *buf);
 179
 180 /* truncte the file to the specified length */
 181 int gmx_truncatefile(char *path, gmx_off_t length);
 182
 183 /* rename/move the file (atomically, if the OS makes that available) oldname
 184    to newname */
 185 int gmx_file_rename(const char *oldname, const char *newname);
 186
 187 /* copy the file (data only) oldname to newname. if copy_if_empty==FALSE,
 188    the file won't be copied if it's empty.*/
 189 int gmx_file_copy(const char *oldname, const char *newname, gmx_bool copy_if_empty);
 190
 191 /* do an fsync() on an open file pointer.
 192    Only use this during checkpointing! */
 193 int gmx_fsync(FILE *fp);
 194
 195 #ifdef GMX_NATIVE_WINDOWS
 196 #define chdir _chdir
 197 #define getcwd _getcwd
 198 #endif
 199
 200 #ifdef __cplusplus
 201 }
 202 #endif
 203
 204 #endif  /* _futil_h */