compiler/posixc/tempnam.c

   1 /*
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)tempnam.c   8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #include <sys/param.h>
  39 #include <errno.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44
  45 #ifdef __AROS__
  46 #    define _mktemp mktemp
  47 #    define _PATH_TMP P_tmpdir
  48 #    define issetugid() 0
  49 #else
  50 #    include <paths.h>
  51
  52 __warn_references(tempnam,
  53     "warning: tempnam() possibly used unsafely; consider using mkstemp()");
  54
  55 extern char *_mktemp(char *);
  56 #endif
  57
  58 /*****************************************************************************
  59
  60     NAME */
  61 #include <stdio.h>
  62
  63         char * tempnam(
  64
  65 /*  SYNOPSIS */
  66         const char *dir,
  67         const char *pfx)
  68
  69 /*  FUNCTION
  70
  71     INPUTS
  72
  73     RESULT
  74
  75     NOTES
  76
  77     EXAMPLE
  78
  79     BUGS
  80
  81     SEE ALSO
  82
  83     INTERNALS
  84
  85 ******************************************************************************/
  86 {
  87         int sverrno;
  88         char *f, *name;
  89
  90         if (!(name = malloc(MAXPATHLEN)))
  91                 return(NULL);
  92
  93         if (!pfx)
  94                 pfx = "tmp.";
  95
  96         if (issetugid() == 0 && (f = getenv("TMPDIR"))) {
  97                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
  98                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
  99                 if ((f = _mktemp(name)))
 100                         return(f);
 101         }
 102
 103         if ((f = (char *)dir)) {
 104                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
 105                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
 106                 if ((f = _mktemp(name)))
 107                         return(f);
 108         }
 109
 110         f = P_tmpdir;
 111         (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
 112         if ((f = _mktemp(name)))
 113                 return(f);
 114
 115         f = _PATH_TMP;
 116         (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
 117         if ((f = _mktemp(name)))
 118                 return(f);
 119
 120         sverrno = errno;
 121         free(name);
 122         errno = sverrno;
 123         return(NULL);
 124 }