usr/src/lib/libbc/libc/stdio/common/tmpnam.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1989 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"  /* from S5R2 1.2 */
  31
  32 /*LINTLIBRARY*/
  33 #include <stdio.h>
  34
  35 extern char *mktemp(), *strcpy(), *strcat();
  36 static char str[L_tmpnam], seed[] = { 'a', 'a', 'a', '\0' };
  37
  38 char *
  39 tmpnam(s)
  40 char    *s;
  41 {
  42         register char *p, *q;
  43         register int cnt = 0;
  44
  45         p = (s == NULL)? str: s;
  46         (void) strcpy(p, P_tmpdir);
  47         (void) strcat(p, seed);
  48         (void) strcat(p, "XXXXXX");
  49
  50         q = seed;
  51         while(*q == 'z') {
  52                 *q++ = 'a';
  53                 cnt++;
  54         }
  55         if (cnt < 3)
  56                 ++*q;
  57
  58         (void) mktemp(p);
  59         return(p);
  60 }