include/futil.h

   1 /*
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   3  *
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   5  * Copyright (c) 2001-2004, The GROMACS development team,
   6  * check out http://www.gromacs.org for more information.
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   8  * David van der Spoel, Berk Hess, Erik Lindahl, and including many
   9  * others, as listed in the AUTHORS file in the top-level source
  10  * directory and at http://www.gromacs.org.
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  38
  39 #ifndef _futil_h
  40 #define _futil_h
  41 #include "visibility.h"
  42 #include <stdio.h>
  43 #include "typedefs.h"
  44 #include "types/commrec.h"
  45
  46 #ifdef __cplusplus
  47 extern "C" {
  48 #endif
  49 #if 0
  50 }
  51 #endif
  52
  53 /* Native windows uses backslash path separators.
  54  * Cygwin and everybody else in the world use slash.
  55  * When reading the PATH environment variable, Unix separates entries
  56  * with colon, while windows uses semicolon.
  57  */
  58 #include "gmx_header_config.h"
  59 #ifdef GMX_NATIVE_WINDOWS
  60 #define DIR_SEPARATOR '\\'
  61 #define PATH_SEPARATOR ";"
  62 #else
  63 #define DIR_SEPARATOR '/'
  64 #define PATH_SEPARATOR ":"
  65 #endif
  66
  67
  68 /* Now get the maximum path size. */
  69 #ifdef PATH_MAX
  70 #  define GMX_PATH_MAX PATH_MAX
  71 #elif defined MAX_PATH
  72 #  define GMX_PATH_MAX MAX_PATH
  73 #else
  74 #  define GMX_PATH_MAX 4096
  75 #endif
  76
  77
  78 #ifdef HAVE_FSEEKO
  79    typedef off_t              gmx_off_t;
  80 #  define SIZEOF_GMX_OFF_T   SIZEOF_OFF_T
  81 #elif defined HAVE__FSEEKI64
  82    typedef __int64            gmx_off_t;
  83 #  define SIZEOF_GMX_OFF_T   8
  84 #else
  85    /* Almost certainly 64 bits, and guaranteed to be available */
  86    typedef gmx_large_int_t    gmx_off_t;
  87 #  define SIZEOF_GMX_OFF_T   SIZEOF_GMX_LARGE_INT
  88 #endif
  89
  90
  91
  92 void no_buffers(void);
  93 /* Turn off buffering of files (which is default) for debugging purposes */
  94
  95 GMX_LIBGMX_EXPORT
  96 gmx_bool gmx_fexist(const char *fname);
  97 /* Return TRUE when fname exists, FALSE otherwise */
  98
  99 GMX_LIBGMX_EXPORT
 100 gmx_bool gmx_fexist_master(const char *fname, t_commrec *cr);
 101 /* Return TRUE when fname exists, FALSE otherwise, bcast from master to others */
 102
 103 gmx_bool gmx_eof(FILE *fp);
 104 /* Return TRUE on end-of-file, FALSE otherwise */
 105
 106 gmx_bool is_pipe(FILE *fp);
 107 /* Check whether the file (opened by ffopen) is a pipe */
 108
 109 /*  Make a backup of file if necessary.
 110     Return false if there was a problem.
 111 */
 112 GMX_LIBGMX_EXPORT
 113 gmx_bool make_backup(const char * file);
 114
 115 GMX_LIBGMX_EXPORT
 116 FILE *ffopen(const char *file, const char *mode);
 117 /* Return a valid file pointer when successful, exits otherwise
 118  * If the file is in compressed format, open a pipe which uncompresses
 119  * the file! Therefore, files must be closed with ffclose (see below)
 120  */
 121
 122 GMX_LIBGMX_EXPORT
 123 int ffclose(FILE *fp);
 124 /* Close files or pipes */
 125
 126
 127 void frewind(FILE *fp);
 128 /* Does not rewind pipes, but does so for normal files */
 129
 130 #define rewind frewind
 131
 132
 133 GMX_LIBGMX_EXPORT
 134 int gmx_fseek(FILE *stream, gmx_off_t offset, int whence);
 135 /* OS-independent fseek. 64-bit when available */
 136
 137 GMX_LIBGMX_EXPORT
 138 gmx_off_t gmx_ftell(FILE *stream);
 139 /* OS-independent fseek. 64-bit when available. */
 140
 141
 142 gmx_bool is_pipe(FILE *fp);
 143
 144 GMX_LIBGMX_EXPORT
 145 char *gmxlibfn(const char *file);
 146 /* allocates and returns a string with the full file name for a library file */
 147
 148 GMX_LIBGMX_EXPORT
 149 FILE *libopen(const char *file);
 150 /* Open a library file for reading. This looks in the current directory
 151  * first, and then in the library directory. If the file is not found,
 152  * it terminates with a fatal_error
 153  */
 154
 155 /* Opaque data type to list directories */
 156 typedef struct gmx_directory *
 157 gmx_directory_t;
 158
 159 /* Open a directory for reading. The first argument should be a pointer
 160  * to a declared gmx_directory_t variable. Returns 0 on success.
 161  */
 162 GMX_LIBGMX_EXPORT
 163 int
 164 gmx_directory_open(gmx_directory_t *p_gmxdir,const char *dirname);
 165
 166
 167 /* Given an initialized gmx_directory_t, if there are more files in
 168  * the directory this routine returns 0 and write the next name
 169  * into the USER-PROVIDED buffer name. The last argument is the max
 170  * number of characters that will be written. Just as strncpy, the
 171  * string will NOT be terminated it it is longer than maxlength_name.
 172  */
 173 GMX_LIBGMX_EXPORT
 174 int
 175 gmx_directory_nextfile(gmx_directory_t gmxdir,char *name,int maxlength_name);
 176
 177 /* Release all data for a directory structure */
 178 GMX_LIBGMX_EXPORT
 179 int
 180 gmx_directory_close(gmx_directory_t gmxdir);
 181
 182
 183
 184 GMX_LIBGMX_EXPORT
 185 gmx_bool get_libdir(char *libdir);
 186
 187 GMX_LIBGMX_EXPORT
 188 char *low_gmxlibfn(const char *file,gmx_bool bAddCWD,gmx_bool bFatal);
 189
 190 FILE *low_libopen(const char *file,gmx_bool bFatal);
 191 /* The same as the above, but does not terminate if (!bFatal) */
 192
 193 /* Create unique name for temp file (wrapper around mkstemp).
 194  * Buf should be at least 7 bytes long
 195  */
 196 GMX_LIBGMX_EXPORT
 197 void gmx_tmpnam(char *buf);
 198
 199 /* truncte the file to the specified length */
 200 int gmx_truncatefile(char *path, gmx_off_t length);
 201
 202 /* rename/move the file (atomically, if the OS makes that available) oldname
 203    to newname */
 204 int gmx_file_rename(const char *oldname, const char *newname);
 205
 206 /* copy the file (data only) oldname to newname. if copy_if_empty==FALSE,
 207    the file won't be copied if it's empty.*/
 208 int gmx_file_copy(const char *oldname, const char *newname, gmx_bool copy_if_empty);
 209
 210 /* do an fsync() on an open file pointer.
 211    Only use this during checkpointing! */
 212 int gmx_fsync(FILE *fp);
 213
 214 #ifdef GMX_NATIVE_WINDOWS
 215 #define chdir _chdir
 216 #define getcwd _getcwd
 217 #endif
 218
 219 #ifdef __cplusplus
 220 }
 221 #endif
 222
 223 #endif  /* _futil_h */