mirror of
git://git.gnupg.org/gnupg.git
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362 lines
8.3 KiB
C
362 lines
8.3 KiB
C
/* fileutil.c - file utilities
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* Copyright (C) 1998, 2003, 2005, 2007 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <assert.h>
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#include <unistd.h>
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#include <sys/types.h>
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#ifdef HAVE_PWD_H
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#include <pwd.h>
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#endif
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#include <ctype.h>
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#ifdef HAVE_W32_SYSTEM
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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#else /*!HAVE_W32_SYSTEM*/
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# include <sys/types.h>
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# include <sys/stat.h>
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# include <unistd.h>
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#endif /*!HAVE_W32_SYSTEM*/
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#include "util.h"
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#include "memory.h"
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#include "ttyio.h"
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/***************
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* Extract from a given path the filename component.
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*
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*/
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char *
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make_basename(const char *filepath, const char *inputpath)
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{
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#ifdef __riscos__
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return riscos_make_basename(filepath, inputpath);
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#endif
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char *p;
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if ( !(p=strrchr(filepath, DIRSEP_C)) )
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#ifdef HAVE_DRIVE_LETTERS
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if ( !(p=strrchr(filepath, '\\')) )
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if ( !(p=strrchr(filepath, ':')) )
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#endif
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{
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return xstrdup(filepath);
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}
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return xstrdup(p+1);
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}
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/***************
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* Extract from a given filename the path prepended to it.
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* If their isn't a path prepended to the filename, a dot
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* is returned ('.').
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*
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*/
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char *
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make_dirname(const char *filepath)
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{
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char *dirname;
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int dirname_length;
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char *p;
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if ( !(p=strrchr(filepath, DIRSEP_C)) )
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#ifdef HAVE_DRIVE_LETTERS
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if ( !(p=strrchr(filepath, '\\')) )
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if ( !(p=strrchr(filepath, ':')) )
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#endif
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{
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return xstrdup(EXTSEP_S);
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}
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dirname_length = p-filepath;
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dirname = xmalloc(dirname_length+1);
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strncpy(dirname, filepath, dirname_length);
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dirname[dirname_length] = 0;
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return dirname;
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}
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/* Expand tildes. Handles both the ~/foo and ~username/foo cases.
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Returns what the tilde expands to. *name is advanced to be past
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the tilde expansion. */
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static char *
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untilde(const char **name)
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{
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char *home=NULL;
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assert((*name)[0]=='~');
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if((*name)[1]==DIRSEP_C || (*name)[1]=='\0')
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{
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/* This is the "~/foo" or "~" case. */
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char *tmp=getenv("HOME");
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if(tmp)
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home=xstrdup(tmp);
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#ifdef HAVE_GETPWUID
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if(!home)
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{
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struct passwd *pwd;
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pwd=getpwuid(getuid());
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if(pwd)
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home=xstrdup(pwd->pw_dir);
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}
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#endif
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if(home)
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(*name)++;
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}
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#ifdef HAVE_GETPWNAM
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else
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{
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/* This is the "~username" case. */
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char *user,*sep;
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struct passwd *pwd;
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user=xstrdup((*name)+1);
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sep=strchr(user,DIRSEP_C);
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if(sep)
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*sep='\0';
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pwd=getpwnam(user);
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if(pwd)
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{
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home=xstrdup(pwd->pw_dir);
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(*name)+=1+strlen(user);
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}
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xfree(user);
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}
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#endif
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return home;
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}
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/*
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Construct a filename from the NULL terminated list of parts. Tilde
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expansion is done here. Note that FIRST_PART must never be NULL and
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that this function is guaranteed to return an allocated string. */
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char *
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make_filename( const char *first_part, ... )
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{
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va_list arg_ptr ;
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size_t n;
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const char *s;
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char *name, *p, *home=NULL;
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va_start( arg_ptr, first_part ) ;
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n = strlen(first_part)+1;
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while( (s=va_arg(arg_ptr, const char *)) )
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n += strlen(s) + 1;
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va_end(arg_ptr);
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#ifndef __riscos__
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if(*first_part=='~')
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{
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home=untilde(&first_part);
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if(home)
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n+=strlen(home);
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}
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#endif
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name = xmalloc(n);
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p = home ? stpcpy(stpcpy(name,home), first_part)
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: stpcpy(name, first_part);
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va_start( arg_ptr, first_part ) ;
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while( (s=va_arg(arg_ptr, const char *)) )
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p = stpcpy(stpcpy(p, DIRSEP_S), s);
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va_end(arg_ptr);
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xfree(home);
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#ifndef __riscos__
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return name;
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#else /* __riscos__ */
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p = riscos_gstrans(name);
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xfree(name);
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return p;
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#endif /* __riscos__ */
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}
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/* Compare whether the filenames are identical. This is a
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special version of strcmp() taking the semantics of filenames in
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account. Note that this function works only on the supplied names
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without considereing any context like the current directory. See
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also same_file_p(). */
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int
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compare_filenames (const char *a, const char *b)
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{
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#ifdef __riscos__
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int c = 0;
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char *abuf, *bbuf;
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abuf = riscos_gstrans(a);
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bbuf = riscos_gstrans(b);
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c = ascii_strcasecmp (abuf, bbuf);
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xfree(abuf);
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xfree(bbuf);
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return c;
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#elif defined (HAVE_DRIVE_LETTERS)
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for ( ; *a && *b; a++, b++ )
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{
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if (*a != *b
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&& (toupper (*(const unsigned char*)a)
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!= toupper (*(const unsigned char*)b) )
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&& !((*a == '/' && *b == '\\') || (*a == '\\' && *b == '/')))
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break;
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}
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if ((*a == '/' && *b == '\\') || (*a == '\\' && *b == '/'))
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return 0;
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else
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return (toupper (*(const unsigned char*)a)
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- toupper (*(const unsigned char*)b));
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#else /*!HAVE_DRIVE_LETTERS*/
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return strcmp (a,b);
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#endif
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}
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/* Check whether the files NAME1 and NAME2 are identical. This is for
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example achieved by comparing the inode numbers of the files. */
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int
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same_file_p (const char *name1, const char *name2)
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{
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int yes;
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/* First try a shortcut. */
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if (!compare_filenames (name1, name2))
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yes = 1;
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else
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{
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#ifdef HAVE_W32_SYSTEM
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HANDLE file1, file2;
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BY_HANDLE_FILE_INFORMATION info1, info2;
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file1 = CreateFile (name1, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
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if (file1 == INVALID_HANDLE_VALUE)
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yes = 0; /* If we can't open the file, it is not the same. */
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else
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{
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file2 = CreateFile (name2, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
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if (file1 == INVALID_HANDLE_VALUE)
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yes = 0; /* If we can't open the file, it is not the same. */
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else
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{
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yes = (GetFileInformationByHandle (file1, &info1)
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&& GetFileInformationByHandle (file2, &info2)
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&& info1.dwVolumeSerialNumber==info2.dwVolumeSerialNumber
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&& info1.nFileIndexHigh == info2.nFileIndexHigh
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&& info1.nFileIndexLow == info2.nFileIndexLow);
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CloseHandle (file2);
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}
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CloseHandle (file1);
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}
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#else /*!HAVE_W32_SYSTEM*/
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struct stat info1, info2;
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yes = (!stat (name1, &info1) && !stat (name2, &info2)
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&& info1.st_dev == info2.st_dev && info1.st_ino == info2.st_ino);
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#endif /*!HAVE_W32_SYSTEM*/
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}
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return yes;
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}
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/****************
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* A simple function to decide whether the filename is stdout
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* or a real filename.
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*/
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const char *
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print_fname_stdout( const char *s )
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{
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if( !s || (*s == '-' && !s[1]) )
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return "[stdout]";
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return s;
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}
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const char *
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print_fname_stdin( const char *s )
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{
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if( !s || (*s == '-' && !s[1]) )
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return "[stdin]";
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return s;
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}
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/****************
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* Check if the file is compressed.
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**/
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int
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is_file_compressed( const char *s, int *ret_rc )
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{
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IOBUF a;
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byte buf[4];
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int i, rc = 0;
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int overflow;
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struct magic_compress_s {
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size_t len;
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byte magic[4];
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} magic[] = {
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{ 3, { 0x42, 0x5a, 0x68, 0x00 } }, /* bzip2 */
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{ 3, { 0x1f, 0x8b, 0x08, 0x00 } }, /* gzip */
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{ 4, { 0x50, 0x4b, 0x03, 0x04 } }, /* (pk)zip */
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};
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if ( iobuf_is_pipe_filename (s) || !ret_rc )
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return 0; /* We can't check stdin or no file was given */
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a = iobuf_open( s );
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if ( a == NULL ) {
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*ret_rc = G10ERR_OPEN_FILE;
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return 0;
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}
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if ( iobuf_get_filelength( a, &overflow ) < 4 && !overflow) {
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*ret_rc = 0;
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goto leave;
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}
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if ( iobuf_read( a, buf, 4 ) == -1 ) {
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*ret_rc = G10ERR_READ_FILE;
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goto leave;
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}
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for ( i = 0; i < DIM( magic ); i++ ) {
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if ( !memcmp( buf, magic[i].magic, magic[i].len ) ) {
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*ret_rc = 0;
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rc = 1;
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break;
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}
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}
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leave:
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iobuf_close( a );
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return rc;
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}
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