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mikx
2023-11-07 05:04:30 -05:00
commit 749adf47ca
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460
deps/mysqllite/mysys/mf_pack.c vendored Normal file
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/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
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>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
static char * expand_tilde(char **path);
/* Pack a dirname ; Changes HOME to ~/ and current dev to ./ */
/* from is a dirname (from dirname() ?) ending with FN_LIBCHAR */
/* to may be == from */
void pack_dirname(char * to, const char *from)
{
int cwd_err;
size_t d_length,length,UNINIT_VAR(buff_length);
char * start;
char buff[FN_REFLEN];
DBUG_ENTER("pack_dirname");
(void) intern_filename(to,from); /* Change to intern name */
#ifdef FN_DEVCHAR
if ((start=strrchr(to,FN_DEVCHAR)) != 0) /* Skip device part */
start++;
else
#endif
start=to;
if (!(cwd_err= my_getwd(buff,FN_REFLEN,MYF(0))))
{
buff_length= strlen(buff);
d_length= (size_t) (start-to);
if ((start == to ||
(buff_length == d_length && !memcmp(buff,start,d_length))) &&
*start != FN_LIBCHAR && *start)
{ /* Put current dir before */
bchange((uchar*) to, d_length, (uchar*) buff, buff_length, strlen(to)+1);
}
}
if ((d_length= cleanup_dirname(to,to)) != 0)
{
length=0;
if (home_dir)
{
length= strlen(home_dir);
if (home_dir[length-1] == FN_LIBCHAR)
length--; /* Don't test last '/' */
}
if (length > 1 && length < d_length)
{ /* test if /xx/yy -> ~/yy */
if (memcmp(to,home_dir,length) == 0 && to[length] == FN_LIBCHAR)
{
to[0]=FN_HOMELIB; /* Filename begins with ~ */
(void) strmov_overlapp(to+1,to+length);
}
}
if (! cwd_err)
{ /* Test if cwd is ~/... */
if (length > 1 && length < buff_length)
{
if (memcmp(buff,home_dir,length) == 0 && buff[length] == FN_LIBCHAR)
{
buff[0]=FN_HOMELIB;
(void) strmov_overlapp(buff+1,buff+length);
}
}
if (is_prefix(to,buff))
{
length= strlen(buff);
if (to[length])
(void) strmov_overlapp(to,to+length); /* Remove everything before */
else
{
to[0]= FN_CURLIB; /* Put ./ instead of cwd */
to[1]= FN_LIBCHAR;
to[2]= '\0';
}
}
}
}
DBUG_PRINT("exit",("to: '%s'",to));
DBUG_VOID_RETURN;
} /* pack_dirname */
/*
remove unwanted chars from dirname
SYNOPSIS
cleanup_dirname()
to Store result here
from Dirname to fix. May be same as to
IMPLEMENTATION
"/../" removes prev dir
"/~/" removes all before ~
//" is same as "/", except on Win32 at start of a file
"/./" is removed
Unpacks home_dir if "~/.." used
Unpacks current dir if if "./.." used
RETURN
# length of new name
*/
size_t cleanup_dirname(register char *to, const char *from)
{
reg5 size_t length;
reg2 char * pos;
reg3 char * from_ptr;
reg4 char * start;
char parent[5], /* for "FN_PARENTDIR" */
buff[FN_REFLEN+1],*end_parentdir;
#ifdef BACKSLASH_MBTAIL
CHARSET_INFO *fs= fs_character_set();
#endif
DBUG_ENTER("cleanup_dirname");
DBUG_PRINT("enter",("from: '%s'",from));
start=buff;
from_ptr=(char *) from;
#ifdef FN_DEVCHAR
if ((pos=strrchr(from_ptr,FN_DEVCHAR)) != 0)
{ /* Skip device part */
length=(size_t) (pos-from_ptr)+1;
start=strnmov(buff,from_ptr,length); from_ptr+=length;
}
#endif
parent[0]=FN_LIBCHAR;
length=(size_t) (strmov(parent+1,FN_PARENTDIR)-parent);
for (pos=start ; (*pos= *from_ptr++) != 0 ; pos++)
{
#ifdef BACKSLASH_MBTAIL
uint l;
if (use_mb(fs) && (l= my_ismbchar(fs, from_ptr - 1, from_ptr + 2)))
{
for (l-- ; l ; *++pos= *from_ptr++, l--);
start= pos + 1; /* Don't look inside multi-byte char */
continue;
}
#endif
if (*pos == '/')
*pos = FN_LIBCHAR;
if (*pos == FN_LIBCHAR)
{
if ((size_t) (pos-start) > length && memcmp(pos-length,parent,length) == 0)
{ /* If .../../; skip prev */
pos-=length;
if (pos != start)
{ /* not /../ */
pos--;
if (*pos == FN_HOMELIB && (pos == start || pos[-1] == FN_LIBCHAR))
{
if (!home_dir)
{
pos+=length+1; /* Don't unpack ~/.. */
continue;
}
pos=strmov(buff,home_dir)-1; /* Unpacks ~/.. */
if (*pos == FN_LIBCHAR)
pos--; /* home ended with '/' */
}
if (*pos == FN_CURLIB && (pos == start || pos[-1] == FN_LIBCHAR))
{
if (my_getwd(curr_dir,FN_REFLEN,MYF(0)))
{
pos+=length+1; /* Don't unpack ./.. */
continue;
}
pos=strmov(buff,curr_dir)-1; /* Unpacks ./.. */
if (*pos == FN_LIBCHAR)
pos--; /* home ended with '/' */
}
end_parentdir=pos;
while (pos >= start && *pos != FN_LIBCHAR) /* remove prev dir */
pos--;
if (pos[1] == FN_HOMELIB ||
(pos > start && memcmp(pos, parent, length) == 0))
{ /* Don't remove ~user/ */
pos=strmov(end_parentdir+1,parent);
*pos=FN_LIBCHAR;
continue;
}
}
}
else if ((size_t) (pos-start) == length-1 &&
!memcmp(start,parent+1,length-1))
start=pos; /* Starts with "../" */
else if (pos-start > 0 && pos[-1] == FN_LIBCHAR)
{
#ifdef FN_NETWORK_DRIVES
if (pos-start != 1)
#endif
pos--; /* Remove dupplicate '/' */
}
else if (pos-start > 1 && pos[-1] == FN_CURLIB && pos[-2] == FN_LIBCHAR)
pos-=2; /* Skip /./ */
else if (pos > buff+1 && pos[-1] == FN_HOMELIB && pos[-2] == FN_LIBCHAR)
{ /* Found ..../~/ */
buff[0]=FN_HOMELIB;
buff[1]=FN_LIBCHAR;
start=buff; pos=buff+1;
}
}
}
(void) strmov(to,buff);
DBUG_PRINT("exit",("to: '%s'",to));
DBUG_RETURN((size_t) (pos-buff));
} /* cleanup_dirname */
/*
On system where you don't have symbolic links, the following
code will allow you to create a file:
directory-name.sym that should contain the real path
to the directory. This will be used if the directory name
doesn't exists
*/
my_bool my_use_symdir=0; /* Set this if you want to use symdirs */
#ifdef USE_SYMDIR
void symdirget(char *dir)
{
char buff[FN_REFLEN+1];
char *pos=strend(dir);
if (dir[0] && pos[-1] != FN_DEVCHAR && my_access(dir, F_OK))
{
File file;
size_t length;
char temp= *(--pos); /* May be "/" or "\" */
strmov(pos,".sym");
file= my_open(dir, O_RDONLY, MYF(0));
*pos++=temp; *pos=0; /* Restore old filename */
if (file >= 0)
{
if ((length= my_read(file, buff, sizeof(buff) - 1, MYF(0))) > 0)
{
for (pos= buff + length ;
pos > buff && (iscntrl(pos[-1]) || isspace(pos[-1])) ;
pos --);
/* Ensure that the symlink ends with the directory symbol */
if (pos == buff || pos[-1] != FN_LIBCHAR)
*pos++=FN_LIBCHAR;
strmake(dir,buff, (size_t) (pos-buff));
}
my_close(file, MYF(0));
}
}
}
#endif /* USE_SYMDIR */
/**
Convert a directory name to a format which can be compared as strings
@param to result buffer, FN_REFLEN chars in length; may be == from
@param from 'packed' directory name, in whatever format
@returns size of the normalized name
@details
- Ensures that last char is FN_LIBCHAR, unless it is FN_DEVCHAR
- Uses cleanup_dirname
It does *not* expand ~/ (although, see cleanup_dirname). Nor does it do
any case folding. All case-insensitive normalization should be done by
the caller.
*/
size_t normalize_dirname(char *to, const char *from)
{
size_t length;
char buff[FN_REFLEN];
DBUG_ENTER("normalize_dirname");
/*
Despite the name, this actually converts the name to the system's
format (TODO: name this properly).
*/
(void) intern_filename(buff, from);
length= strlen(buff); /* Fix that '/' is last */
if (length &&
#ifdef FN_DEVCHAR
buff[length - 1] != FN_DEVCHAR &&
#endif
buff[length - 1] != FN_LIBCHAR && buff[length - 1] != '/')
{
/* we need reserve 2 bytes for the trailing slash and the zero */
if (length >= sizeof (buff) - 1)
length= sizeof (buff) - 2;
buff[length]= FN_LIBCHAR;
buff[length + 1]= '\0';
}
length=cleanup_dirname(to, buff);
DBUG_RETURN(length);
}
/**
Fixes a directory name so that can be used by open()
@param to Result buffer, FN_REFLEN characters. May be == from
@param from 'Packed' directory name (may contain ~)
@details
- Uses normalize_dirname()
- Expands ~/... to home_dir/...
- Resolves MySQL's fake "foo.sym" symbolic directory names (if USE_SYMDIR)
- Changes a UNIX filename to system filename (replaces / with \ on windows)
@returns
Length of new directory name (= length of to)
*/
size_t unpack_dirname(char * to, const char *from)
{
size_t length, h_length;
char buff[FN_REFLEN+1+4],*suffix,*tilde_expansion;
DBUG_ENTER("unpack_dirname");
length= normalize_dirname(buff, from);
if (buff[0] == FN_HOMELIB)
{
suffix=buff+1; tilde_expansion=expand_tilde(&suffix);
if (tilde_expansion)
{
length-= (size_t) (suffix-buff)-1;
if (length+(h_length= strlen(tilde_expansion)) <= FN_REFLEN)
{
if ((h_length > 0) && (tilde_expansion[h_length-1] == FN_LIBCHAR))
h_length--;
if (buff+h_length < suffix)
bmove(buff+h_length,suffix,length);
else
bmove_upp((uchar*) buff+h_length+length, (uchar*) suffix+length, length);
bmove(buff,tilde_expansion,h_length);
}
}
}
#ifdef USE_SYMDIR
if (my_use_symdir)
symdirget(buff);
#endif
DBUG_RETURN(system_filename(to,buff)); /* Fix for open */
} /* unpack_dirname */
/* Expand tilde to home or user-directory */
/* Path is reset to point at FN_LIBCHAR after ~xxx */
static char * expand_tilde(char **path)
{
if (path[0][0] == FN_LIBCHAR)
return home_dir; /* ~/ expanded to home */
#ifdef HAVE_GETPWNAM
{
char *str,save;
struct passwd *user_entry;
if (!(str=strchr(*path,FN_LIBCHAR)))
str=strend(*path);
save= *str; *str= '\0';
user_entry=getpwnam(*path);
*str=save;
endpwent();
if (user_entry)
{
*path=str;
return user_entry->pw_dir;
}
}
#endif
return (char *) 0;
}
/*
Fix filename so it can be used by open, create
SYNOPSIS
unpack_filename()
to Store result here. Must be at least of size FN_REFLEN.
from Filename in unix format (with ~)
RETURN
# length of to
NOTES
to may be == from
~ will only be expanded if total length < FN_REFLEN
*/
size_t unpack_filename(char * to, const char *from)
{
size_t length, n_length, buff_length;
char buff[FN_REFLEN];
DBUG_ENTER("unpack_filename");
length=dirname_part(buff, from, &buff_length);/* copy & convert dirname */
n_length=unpack_dirname(buff,buff);
if (n_length+strlen(from+length) < FN_REFLEN)
{
(void) strmov(buff+n_length,from+length);
length= system_filename(to,buff); /* Fix to usably filename */
}
else
length= system_filename(to,from); /* Fix to usably filename */
DBUG_RETURN(length);
} /* unpack_filename */
/* Convert filename (unix standard) to system standard */
/* Used before system command's like open(), create() .. */
/* Returns used length of to; total length should be FN_REFLEN */
size_t system_filename(char *to, const char *from)
{
return (size_t) (strmake(to,from,FN_REFLEN-1)-to);
}
/* Fix a filename to intern (UNIX format) */
char *intern_filename(char *to, const char *from)
{
size_t length, to_length;
char buff[FN_REFLEN];
if (from == to)
{ /* Dirname may destroy from */
strmov(buff,from);
from=buff;
}
length= dirname_part(to, from, &to_length); /* Copy dirname & fix chars */
(void) strmov(to + to_length,from+length);
return (to);
} /* intern_filename */