usr/src/lib/libbc/libc/stdio/common/tempnam.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 1993 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 1.1 */
  31
  32 /*LINTLIBRARY*/
  33 #include <stdio.h>
  34 #include <string.h>
  35
  36 #define max(A,B) (((A)<(B))?(B):(A))
  37
  38 extern char *malloc(), *getenv(), *mktemp();
  39 extern int access();
  40
  41 static char *pcopy();
  42 static char seed[4];
  43
  44 char *
  45 tempnam(dir, pfx)
  46 char *dir;              /* use this directory please (if non-NULL) */
  47 char *pfx;              /* use this (if non-NULL) as filename prefix */
  48 {
  49         register char *p, *q, *tdir;
  50         int x=0, y=0, z;
  51
  52         if (seed[0] == 0)
  53                 seed[0] = seed[1] = seed[2] = 'A';
  54         z=strlen(P_tmpdir);
  55         if((tdir = getenv("TMPDIR")) != NULL) {
  56                 x = strlen(tdir);
  57         }
  58         if(dir != NULL) {
  59                 y=strlen(dir);
  60         }
  61         if((p=malloc((unsigned)(max(max(x,y),z)+16))) == NULL)
  62                 return(NULL);
  63         if(x > 0 && access(pcopy(p, tdir), 3) == 0)
  64                 goto OK;
  65         if(y > 0 && access(pcopy(p, dir), 3) == 0)
  66                 goto OK;
  67         if(access(pcopy(p, P_tmpdir), 3) == 0)
  68                 goto OK;
  69         if(access(pcopy(p, "/tmp"), 3) != 0)
  70                 return(NULL);
  71 OK:
  72         (void)strcat(p, "/");
  73         if(pfx) {
  74                 *(p+strlen(p)+5) = '\0';
  75                 (void)strncat(p, pfx, 5);
  76         }
  77         (void)strcat(p, seed);
  78         (void)strcat(p, "XXXXXX");
  79         q = seed;
  80         while(*q == 'Z')
  81                 *q++ = 'A';
  82         ++*q;
  83         if(*mktemp(p) == '\0')
  84                 return(NULL);
  85         return(p);
  86 }
  87
  88 static char*
  89 pcopy(space, arg)
  90 char *space, *arg;
  91 {
  92         char *p;
  93
  94         if(arg) {
  95                 (void)strcpy(space, arg);
  96                 p = space-1+strlen(space);
  97                 if(*p == '/')
  98                         *p = '\0';
  99         }
 100         return(space);
 101 }