contrib/bind-9.5.2/lib/bind/bsd/mktemp.c

   1 #if defined(LIBC_SCCS) && !defined(lint)
   2 static const char sccsid[] = "@(#)mktemp.c      8.1 (Berkeley) 6/4/93";
   3 static const char rcsid[] = "$Id: mktemp.c,v 1.2 2005/04/27 04:56:11 sra Exp $";
   4 #endif /* LIBC_SCCS and not lint */
   5
   6 /*
   7  * Copyright (c) 1987, 1993
   8  *    The Regents of the University of California.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 /*
  40  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  41  *
  42  * Permission to use, copy, modify, and distribute this software for any
  43  * purpose with or without fee is hereby granted, provided that the above
  44  * copyright notice and this permission notice appear in all copies, and that
  45  * the name of Digital Equipment Corporation not be used in advertising or
  46  * publicity pertaining to distribution of the document or software without
  47  * specific, written prior permission.
  48  *
  49  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  50  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  51  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  52  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  53  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  54  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  55  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  56  * SOFTWARE.
  57  */
  58
  59 #include "port_before.h"
  60
  61 #include <sys/types.h>
  62 #include <sys/stat.h>
  63
  64 #include <ctype.h>
  65 #include <errno.h>
  66 #include <fcntl.h>
  67 #include <stdio.h>
  68
  69 #include "port_after.h"
  70
  71 #if (!defined(NEED_MKTEMP)) && (!defined(NEED_MKSTEMP))
  72 int __mktemp_unneeded__;
  73 #else
  74
  75 static int gettemp(char *path, int *doopen);
  76
  77 #ifdef NEED_MKSTEMP
  78 mkstemp(char *path) {
  79         int fd;
  80
  81         return (gettemp(path, &fd) ? fd : -1);
  82 }
  83 #endif
  84
  85 #ifdef NEED_MKTEMP
  86 char *
  87 mktemp(char *path) {
  88         return(gettemp(path, (int *)NULL) ? path : (char *)NULL);
  89 }
  90 #endif
  91
  92 static int
  93 gettemp(char *path, int *doopen) {
  94         char *start, *trv;
  95         struct stat sbuf;
  96         u_int pid;
  97
  98         pid = getpid();
  99         for (trv = path; *trv; ++trv);          /*%< extra X's get set to 0's */
 100         while (*--trv == 'X') {
 101                 *trv = (pid % 10) + '0';
 102                 pid /= 10;
 103         }
 104
 105         /*
 106          * check the target directory; if you have six X's and it
 107          * doesn't exist this runs for a *very* long time.
 108          */
 109         for (start = trv + 1;; --trv) {
 110                 if (trv <= path)
 111                         break;
 112                 if (*trv == '/') {
 113                         *trv = '\0';
 114                         if (stat(path, &sbuf))
 115                                 return(0);
 116                         if (!S_ISDIR(sbuf.st_mode)) {
 117                                 errno = ENOTDIR;
 118                                 return(0);
 119                         }
 120                         *trv = '/';
 121                         break;
 122                 }
 123         }
 124
 125         for (;;) {
 126                 if (doopen) {
 127                         if ((*doopen =
 128                             open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
 129                                 return(1);
 130                         if (errno != EEXIST)
 131                                 return(0);
 132                 }
 133                 else if (stat(path, &sbuf))
 134                         return(errno == ENOENT ? 1 : 0);
 135
 136                 /* tricky little algorithm for backward compatibility */
 137                 for (trv = start;;) {
 138                         if (!*trv)
 139                                 return(0);
 140                         if (*trv == 'z')
 141                                 *trv++ = 'a';
 142                         else {
 143                                 if (isdigit(*trv))
 144                                         *trv = 'a';
 145                                 else
 146                                         ++*trv;
 147                                 break;
 148                         }
 149                 }
 150         }
 151         /*NOTREACHED*/
 152 }
 153
 154 #endif /*NEED_MKTEMP*/
 155
 156 /*! \file */