mf_path.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /* 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>
- static char *find_file_in_path(char *to,const char *name);
- /* Finds where program can find it's files.
- pre_pathname is found by first locking at progname (argv[0]).
- if progname contains path the path is returned.
- else if progname is found in path, return it
- else if progname is given and POSIX environment variable "_" is set
- then path is taken from "_".
- If filename doesn't contain a path append MY_BASEDIR_VERSION or
- MY_BASEDIR if defined, else append "/my/running".
- own_path_name_part is concatinated to result.
- my_path puts result in to and returns to */
- my_string my_path(my_string to, const char *progname,
- const char *own_pathname_part)
- {
- my_string start,end,prog;
- DBUG_ENTER("my_path");
- start=to; /* Return this */
- if (progname && (dirname_part(to, progname) ||
- find_file_in_path(to,progname) ||
- ((prog=getenv("_")) != 0 && dirname_part(to,prog))))
- {
- VOID(intern_filename(to,to));
- if (!test_if_hard_path(to))
- {
- if (!my_getwd(curr_dir,FN_REFLEN,MYF(0)))
- bchange(to,0,curr_dir, (uint) strlen(curr_dir), (uint) strlen(to)+1);
- }
- }
- else
- {
- if ((end = getenv("MY_BASEDIR_VERSION")) == 0 &&
- (end = getenv("MY_BASEDIR")) == 0)
- {
- #ifdef DEFAULT_BASEDIR
- end= (char*) DEFAULT_BASEDIR;
- #else
- end= (char*) "/my/";
- #endif
- }
- VOID(intern_filename(to,end));
- to=strend(to);
- if (to != start && to[-1] != FN_LIBCHAR)
- *to++ = FN_LIBCHAR;
- VOID(strmov(to,own_pathname_part));
- }
- DBUG_PRINT("exit",("to: '%s'",start));
- DBUG_RETURN(start);
- } /* my_path */
- /* test if file without filename is found in path */
- /* Returns to if found and to has dirpart if found, else NullS */
- #if defined(MSDOS) || defined(__WIN__) || defined(__EMX__) || defined(OS2)
- #define F_OK 0
- #define PATH_SEP ';'
- #define PROGRAM_EXTENSION ".exe"
- #elif defined(__NETWARE__)
- #define PATH_SEP ';'
- #define PROGRAM_EXTENSION ".nlm"
- #else
- #define PATH_SEP ':'
- #endif
- static char *find_file_in_path(char *to, const char *name)
- {
- char *path,*pos,dir[2];
- const char *ext="";
- if (!(path=getenv("PATH")))
- return NullS;
- dir[0]=FN_LIBCHAR; dir[1]=0;
- #ifdef PROGRAM_EXTENSION
- if (!fn_ext(name)[0])
- ext=PROGRAM_EXTENSION;
- #endif
- for (pos=path ; (pos=strchr(pos,PATH_SEP)) ; path= ++pos)
- {
- if (path != pos)
- {
- strxmov(strnmov(to,path,(uint) (pos-path)),dir,name,ext,NullS);
- if (!access(to,F_OK))
- {
- to[(uint) (pos-path)+1]=0; /* Return path only */
- return to;
- }
- }
- }
- #ifdef __WIN__
- to[0]=FN_CURLIB;
- strxmov(to+1,dir,name,ext,NullS);
- if (!access(to,F_OK)) /* Test in current dir */
- {
- to[2]=0; /* Leave "." */
- return to;
- }
- #endif
- return NullS; /* File not found */
- }