wut/libraries/wutdevoptab/devoptab_fs_open.c

#include "devoptab_fs.h"

int
__wut_fs_open(struct _reent *r,
              void *fileStruct,
              const char *path,
              int flags,
              int mode)
{
   FSFileHandle fd;
   FSStatus status;
   FSCmdBlock cmd;
   const char *fsMode;
   __wut_fs_file_t *file;

   if (!fileStruct || !path) {
      r->_errno = EINVAL;
      return -1;
   }

   // Map flags to open modes
   if (flags == 0) {
      fsMode = "r";
   } else if (flags == 2) {
      fsMode = "r+";
   } else if (flags == 0x601) {
      fsMode = "w";
   } else if(flags == 0x602) {
      fsMode = "w+";
   } else if(flags == 0x209) {
      fsMode = "a";
   } else if(flags == 0x20A) {
      fsMode = "a+";
   } else {
      r->_errno = EINVAL;
      return -1;
   }

   char *fixedPath = __wut_fs_fixpath(r,path);
   if (!fixedPath) {
      return -1;
   }

   // Open the file
   FSInitCmdBlock(&cmd);
   status = FSOpenFile(__wut_devoptab_fs_client, &cmd, fixedPath, fsMode, &fd,
                       FS_ERROR_FLAG_ALL);
   free(fixedPath);
   if (status < 0) {
      r->_errno = __wut_fs_translate_error(status);
      return -1;
   }

   file = (__wut_fs_file_t *)fileStruct;
   file->fd = fd;
   file->flags = (flags & (O_ACCMODE|O_APPEND|O_SYNC));
   FSGetPosFile(__wut_devoptab_fs_client, &cmd, fd, &file->offset, FS_ERROR_FLAG_ALL);
   return 0;
}