latest sources commit

deps/mysqllite/mysys/mf_dirname.c

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+/* Copyright (C) 2000 MySQL AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include "mysys_priv.h"
+#include <m_string.h>
+
+	/* Functions definied in this file */
+
+size_t dirname_length(const char *name)
+{
+  register char *pos, *gpos;
+#ifdef BASKSLASH_MBTAIL
+  CHARSET_INFO *fs= fs_character_set();
+#endif
+#ifdef FN_DEVCHAR
+  if ((pos=(char*)strrchr(name,FN_DEVCHAR)) == 0)
+#endif
+    pos=(char*) name-1;
+
+  gpos= pos++;
+  for ( ; *pos ; pos++)				/* Find last FN_LIBCHAR */
+  {
+#ifdef BASKSLASH_MBTAIL
+    uint l;
+    if (use_mb(fs) && (l= my_ismbchar(fs, pos, pos + 3)))
+    {
+      pos+= l - 1;
+      continue;
+    }
+#endif
+    if (*pos == FN_LIBCHAR || *pos == '/')
+      gpos=pos;
+  }
+  return (size_t) (gpos+1-(char*) name);
+}
+
+
+/*
+  Gives directory part of filename. Directory ends with '/'
+
+  SYNOPSIS
+    dirname_part()
+    to		Store directory name here
+    name	Original name
+    to_length	Store length of 'to' here
+
+  RETURN
+   #  Length of directory part in 'name'
+*/
+
+size_t dirname_part(char *to, const char *name, size_t *to_res_length)
+{
+  size_t length;
+  DBUG_ENTER("dirname_part");
+  DBUG_PRINT("enter",("'%s'",name));
+
+  length=dirname_length(name);
+  *to_res_length= (size_t) (convert_dirname(to, name, name+length) - to);
+  DBUG_RETURN(length);
+} /* dirname */
+
+
+/*
+  Convert directory name to use under this system
+
+  SYNPOSIS
+    convert_dirname()
+    to				Store result here. Must be at least of size
+    				min(FN_REFLEN, strlen(from) + 1) to make room
+    				for adding FN_LIBCHAR at the end.
+    from			Original filename. May be == to
+    from_end			Pointer at end of filename (normally end \0)
+
+  IMPLEMENTATION
+    If Windows converts '/' to '\'
+    Adds a FN_LIBCHAR to end if the result string if there isn't one
+    and the last isn't dev_char.
+    Copies data from 'from' until ASCII(0) for until from == from_end
+    If you want to use the whole 'from' string, just send NullS as the
+    last argument.
+
+    If the result string is larger than FN_REFLEN -1, then it's cut.
+
+  RETURN
+   Returns pointer to end \0 in to
+*/
+
+#ifndef FN_DEVCHAR
+#define FN_DEVCHAR '\0'				/* For easier code */
+#endif
+
+char *convert_dirname(char *to, const char *from, const char *from_end)
+{
+  char *to_org=to;
+#ifdef BACKSLASH_MBTAIL
+  CHARSET_INFO *fs= fs_character_set();
+#endif
+  DBUG_ENTER("convert_dirname");
+
+  /* We use -2 here, becasue we need place for the last FN_LIBCHAR */
+  if (!from_end || (from_end - from) > FN_REFLEN-2)
+    from_end=from+FN_REFLEN -2;
+
+#if FN_LIBCHAR != '/'
+  {
+    for (; from != from_end && *from ; from++)
+    {
+      if (*from == '/')
+	*to++= FN_LIBCHAR;
+      else
+      {
+#ifdef BACKSLASH_MBTAIL
+        uint l;
+        if (use_mb(fs) && (l= my_ismbchar(fs, from, from + 3)))
+        {
+          memmove(to, from, l);
+          to+= l;
+          from+= l - 1;
+          to_org= to; /* Don't look inside mbchar */
+        }
+        else
+#endif
+        {
+          *to++= *from;
+        }
+      }
+    }
+    *to=0;
+  }
+#else
+  /* This is ok even if to == from, becasue we need to cut the string */
+  to= strmake(to, from, (size_t) (from_end-from));
+#endif
+
+  /* Add FN_LIBCHAR to the end of directory path */
+  if (to != to_org && (to[-1] != FN_LIBCHAR && to[-1] != FN_DEVCHAR))
+  {
+    *to++=FN_LIBCHAR;
+    *to=0;
+  }
+  DBUG_RETURN(to);                              /* Pointer to end of dir */
+} /* convert_dirname */