mf_dirname.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:4k
- /* 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; either version 2 of the License, or
- (at your option) any later version.
- 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 */
- uint dirname_length(const char *name)
- {
- register my_string 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 == '/'
- #ifdef FN_C_AFTER_DIR
- || *pos == FN_C_AFTER_DIR || *pos == FN_C_AFTER_DIR_2
- #endif
- )
- gpos=pos;
- }
- return ((uint) (uint) (gpos+1-(char*) name));
- }
- /* Gives directory part of filename. Directory ends with '/' */
- /* Returns length of directory part */
- uint dirname_part(my_string to, const char *name)
- {
- uint length;
- DBUG_ENTER("dirname_part");
- DBUG_PRINT("enter",("'%s'",name));
- length=dirname_length(name);
- convert_dirname(to, name, name+length);
- DBUG_RETURN(length);
- } /* dirname */
- /*
- Convert directory name to use under this system
- SYNPOSIS
- convert_dirname()
- to Store result here
- from Original filename
- from_end Pointer at end of filename (normally end )
- IMPLEMENTATION
- If MSDOS converts '/' to ''
- If VMS converts '<' to '[' and '>' 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 in to
- */
- #ifndef FN_DEVCHAR
- #define FN_DEVCHAR '' /* 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
- /* 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 != '/' || defined(FN_C_BEFORE_DIR_2)
- {
- for (; *from && from != from_end; from++)
- {
- if (*from == '/')
- *to++= FN_LIBCHAR;
- #ifdef FN_C_BEFORE_DIR_2
- else if (*from == FN_C_BEFORE_DIR_2)
- *to++= FN_C_BEFORE_DIR;
- else if (*from == FN_C_AFTER_DIR_2)
- *to++= FN_C_AFTER_DIR;
- #endif
- 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, (uint) (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;
- }
- return to; /* Pointer to end of dir */
- } /* convert_dirname */