rewrite tmpnam(BA_LIB) from manual page and add Berkeley specific header

[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 this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific written prior permission. This software
* is provided ``as is'' without express or implied warranty.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)tempnam.c   4.4 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

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

#define P_tmpdir        "/usr/tmp"

FILE *
tmpfile()
{
       FILE *fp;
       char *f, name[MAXPATHLEN], *tmpnam();

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

char *
tmpnam(s)
       char *s;
{
       static char name[MAXPATHLEN];
       char *mktemp();

       if (!s)
               s = name;
       (void)sprintf(s, "%s/XXXXXX", P_tmpdir);
       return(mktemp(s));
}

char *
tempnam(dir, pfx)
       char *dir, *pfx;
{
       struct stat buf;
       char *f, *name, *getenv(), *malloc(), *mktemp(), *strcat(), *strcpy();

       if (!(name = malloc((u_int)MAXPATHLEN)))
               return(NULL);
       if ((f = getenv("TMPDIR")) && !stat(f, &buf) &&
           (buf.st_mode&S_IFMT) == S_IFDIR && !access(f, W_OK|X_OK)) {
               (void)strcpy(name, f);
               goto done;
       }
       if (dir && !stat(dir, &buf) &&
           (buf.st_mode&S_IFMT) == S_IFDIR && !access(dir, W_OK|X_OK)) {
               (void)strcpy(name, dir);
               goto done;
       }
       if (!stat(P_tmpdir, &buf) &&
           (buf.st_mode&S_IFMT) == S_IFDIR && !access(P_tmpdir, W_OK|X_OK)) {
               (void)strcpy(name, P_tmpdir);
               goto done;
       }
       if (!stat("/tmp", &buf) &&
           (buf.st_mode&S_IFMT) == S_IFDIR && !access("/tmp", W_OK|X_OK)) {
               (void)strcpy(name, "/tmp");
               goto done;
       }
       return(NULL);
done:   (void)strcat(name, "/");
       if (pfx)
               (void)strcat(name, pfx);
       (void)strcat(name, "XXXXXX");
       return(mktemp(name));
}