cleanup; tmpfile now lets tmpnam allocate space for it, also checks

[unix-history] / usr / src / lib / libc / stdio / tempnam.c

/*
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)tempnam.c   4.6 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <stdio.h>

#define P_tmpdir        "/usr/tmp"

FILE *
tmpfile()
{
       FILE *fp;
       char *f, *tmpnam();

       if (!(f = tmpnam((char *)NULL)) || !(fp = fopen(f, "w+"))) {
               fprintf(stderr, "tmpfile: cannot open %s.\n", f);
               return(NULL);
       }
       (void)unlink(f);
       return(fp);
}

char *
tmpnam(s)
       char *s;
{
       char *malloc(), *mktemp();

       if (!s && !(s = malloc((u_int)MAXPATHLEN)))
               return(NULL);
       (void)sprintf(s, "%s/XXXXXX", P_tmpdir);
       return(mktemp(s));
}

char *
tempnam(dir, pfx)
       char *dir, *pfx;
{
       char *f, *name, *getenv(), *malloc(), *mktemp();

       if (!(name = malloc((u_int)MAXPATHLEN)))
               return(NULL);

       if (f = getenv("TMPDIR")) {
               (void)sprintf(name, "%s/%sXXXXXX", f, pfx ? "" : pfx);
               if (f = mktemp(name))
                       return(f);
       }
       if (dir) {
               (void)sprintf(name, "%s/%sXXXXXX", dir, pfx ? "" : pfx);
               if (f = mktemp(name))
                       return(f);
       }
       (void)sprintf(name, "%s/%sXXXXXX", P_tmpdir, pfx ? "" : pfx);
       if (f = mktemp(name))
               return(f);
       (void)sprintf(name, "/tmp/%sXXXXXX", pfx ? "" : pfx);
       return(mktemp(name));
}