gdbsupport/fileio.cc

   1 /* File-I/O functions for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "common-defs.h"
  21 #include "fileio.h"
  22 #include <sys/stat.h>
  23 #include <fcntl.h>
  24
  25 /* See fileio.h.  */
  26
  27 int
  28 host_to_fileio_error (int error)
  29 {
  30   switch (error)
  31     {
  32       case EPERM:
  33         return FILEIO_EPERM;
  34       case ENOENT:
  35         return FILEIO_ENOENT;
  36       case EINTR:
  37         return FILEIO_EINTR;
  38       case EIO:
  39         return FILEIO_EIO;
  40       case EBADF:
  41         return FILEIO_EBADF;
  42       case EACCES:
  43         return FILEIO_EACCES;
  44       case EFAULT:
  45         return FILEIO_EFAULT;
  46       case EBUSY:
  47         return FILEIO_EBUSY;
  48       case EEXIST:
  49         return FILEIO_EEXIST;
  50       case ENODEV:
  51         return FILEIO_ENODEV;
  52       case ENOTDIR:
  53         return FILEIO_ENOTDIR;
  54       case EISDIR:
  55         return FILEIO_EISDIR;
  56       case EINVAL:
  57         return FILEIO_EINVAL;
  58       case ENFILE:
  59         return FILEIO_ENFILE;
  60       case EMFILE:
  61         return FILEIO_EMFILE;
  62       case EFBIG:
  63         return FILEIO_EFBIG;
  64       case ENOSPC:
  65         return FILEIO_ENOSPC;
  66       case ESPIPE:
  67         return FILEIO_ESPIPE;
  68       case EROFS:
  69         return FILEIO_EROFS;
  70       case ENOSYS:
  71         return FILEIO_ENOSYS;
  72       case ENAMETOOLONG:
  73         return FILEIO_ENAMETOOLONG;
  74     }
  75   return FILEIO_EUNKNOWN;
  76 }
  77
  78 /* See fileio.h.  */
  79
  80 int
  81 fileio_to_host_openflags (int fileio_open_flags, int *open_flags_p)
  82 {
  83   int open_flags = 0;
  84
  85   if (fileio_open_flags & ~FILEIO_O_SUPPORTED)
  86     return -1;
  87
  88   if (fileio_open_flags & FILEIO_O_CREAT)
  89     open_flags |= O_CREAT;
  90   if (fileio_open_flags & FILEIO_O_EXCL)
  91     open_flags |= O_EXCL;
  92   if (fileio_open_flags & FILEIO_O_TRUNC)
  93     open_flags |= O_TRUNC;
  94   if (fileio_open_flags & FILEIO_O_APPEND)
  95     open_flags |= O_APPEND;
  96   if (fileio_open_flags & FILEIO_O_RDONLY)
  97     open_flags |= O_RDONLY;
  98   if (fileio_open_flags & FILEIO_O_WRONLY)
  99     open_flags |= O_WRONLY;
 100   if (fileio_open_flags & FILEIO_O_RDWR)
 101     open_flags |= O_RDWR;
 102   /* On systems supporting binary and text mode, always open files
 103      in binary mode. */
 104 #ifdef O_BINARY
 105   open_flags |= O_BINARY;
 106 #endif
 107
 108   *open_flags_p = open_flags;
 109   return 0;
 110 }
 111
 112 /* See fileio.h.  */
 113
 114 int
 115 fileio_to_host_mode (int fileio_mode, mode_t *mode_p)
 116 {
 117   mode_t mode = 0;
 118
 119   if (fileio_mode & ~FILEIO_S_SUPPORTED)
 120     return -1;
 121
 122   if (fileio_mode & FILEIO_S_IFREG)
 123     mode |= S_IFREG;
 124   if (fileio_mode & FILEIO_S_IFDIR)
 125     mode |= S_IFDIR;
 126   if (fileio_mode & FILEIO_S_IFCHR)
 127     mode |= S_IFCHR;
 128   if (fileio_mode & FILEIO_S_IRUSR)
 129     mode |= S_IRUSR;
 130   if (fileio_mode & FILEIO_S_IWUSR)
 131     mode |= S_IWUSR;
 132   if (fileio_mode & FILEIO_S_IXUSR)
 133     mode |= S_IXUSR;
 134 #ifdef S_IRGRP
 135   if (fileio_mode & FILEIO_S_IRGRP)
 136     mode |= S_IRGRP;
 137 #endif
 138 #ifdef S_IWGRP
 139   if (fileio_mode & FILEIO_S_IWGRP)
 140     mode |= S_IWGRP;
 141 #endif
 142 #ifdef S_IXGRP
 143   if (fileio_mode & FILEIO_S_IXGRP)
 144     mode |= S_IXGRP;
 145 #endif
 146   if (fileio_mode & FILEIO_S_IROTH)
 147     mode |= S_IROTH;
 148 #ifdef S_IWOTH
 149   if (fileio_mode & FILEIO_S_IWOTH)
 150     mode |= S_IWOTH;
 151 #endif
 152 #ifdef S_IXOTH
 153   if (fileio_mode & FILEIO_S_IXOTH)
 154     mode |= S_IXOTH;
 155 #endif
 156
 157   *mode_p = mode;
 158   return 0;
 159 }
 160
 161 /* Convert a host-format mode_t into a bitmask of File-I/O flags.  */
 162
 163 static LONGEST
 164 fileio_mode_pack (mode_t mode)
 165 {
 166   mode_t tmode = 0;
 167
 168   if (S_ISREG (mode))
 169     tmode |= FILEIO_S_IFREG;
 170   if (S_ISDIR (mode))
 171     tmode |= FILEIO_S_IFDIR;
 172   if (S_ISCHR (mode))
 173     tmode |= FILEIO_S_IFCHR;
 174   if (mode & S_IRUSR)
 175     tmode |= FILEIO_S_IRUSR;
 176   if (mode & S_IWUSR)
 177     tmode |= FILEIO_S_IWUSR;
 178   if (mode & S_IXUSR)
 179     tmode |= FILEIO_S_IXUSR;
 180 #ifdef S_IRGRP
 181   if (mode & S_IRGRP)
 182     tmode |= FILEIO_S_IRGRP;
 183 #endif
 184 #ifdef S_IWGRP
 185   if (mode & S_IWGRP)
 186     tmode |= FILEIO_S_IWGRP;
 187 #endif
 188 #ifdef S_IXGRP
 189   if (mode & S_IXGRP)
 190     tmode |= FILEIO_S_IXGRP;
 191 #endif
 192   if (mode & S_IROTH)
 193     tmode |= FILEIO_S_IROTH;
 194 #ifdef S_IWOTH
 195   if (mode & S_IWOTH)
 196     tmode |= FILEIO_S_IWOTH;
 197 #endif
 198 #ifdef S_IXOTH
 199   if (mode & S_IXOTH)
 200     tmode |= FILEIO_S_IXOTH;
 201 #endif
 202   return tmode;
 203 }
 204
 205 /* Pack a host-format mode_t into an fio_mode_t.  */
 206
 207 static void
 208 host_to_fileio_mode (mode_t num, fio_mode_t fnum)
 209 {
 210   host_to_bigendian (fileio_mode_pack (num), (char *) fnum, 4);
 211 }
 212
 213 /* Pack a host-format integer into an fio_ulong_t.  */
 214
 215 static void
 216 host_to_fileio_ulong (LONGEST num, fio_ulong_t fnum)
 217 {
 218   host_to_bigendian (num, (char *) fnum, 8);
 219 }
 220
 221 /* See fileio.h.  */
 222
 223 void
 224 host_to_fileio_stat (struct stat *st, struct fio_stat *fst)
 225 {
 226   LONGEST blksize;
 227
 228   host_to_fileio_uint ((long) st->st_dev, fst->fst_dev);
 229   host_to_fileio_uint ((long) st->st_ino, fst->fst_ino);
 230   host_to_fileio_mode (st->st_mode, fst->fst_mode);
 231   host_to_fileio_uint ((long) st->st_nlink, fst->fst_nlink);
 232   host_to_fileio_uint ((long) st->st_uid, fst->fst_uid);
 233   host_to_fileio_uint ((long) st->st_gid, fst->fst_gid);
 234   host_to_fileio_uint ((long) st->st_rdev, fst->fst_rdev);
 235   host_to_fileio_ulong ((LONGEST) st->st_size, fst->fst_size);
 236 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
 237   blksize = st->st_blksize;
 238 #else
 239   blksize = 512;
 240 #endif
 241   host_to_fileio_ulong (blksize, fst->fst_blksize);
 242 #if HAVE_STRUCT_STAT_ST_BLOCKS
 243   host_to_fileio_ulong ((LONGEST) st->st_blocks, fst->fst_blocks);
 244 #else
 245   /* FIXME: This is correct for DJGPP, but other systems that don't
 246      have st_blocks, if any, might prefer 512 instead of st_blksize.
 247      (eliz, 30-12-2003)  */
 248   host_to_fileio_ulong (((LONGEST) st->st_size + blksize - 1)
 249                         / blksize,
 250                         fst->fst_blocks);
 251 #endif
 252   host_to_fileio_time (st->st_atime, fst->fst_atime);
 253   host_to_fileio_time (st->st_mtime, fst->fst_mtime);
 254   host_to_fileio_time (st->st_ctime, fst->fst_ctime);
 255 }