1/* { dg-do compile } */
2/* { dg-options "-O2" } */
3
4extern __SIZE_TYPE__ strlen (__const char *__s)
5     __attribute__ ((__nothrow__)) __attribute__ ((__pure__)) __attribute__ ((__nonnull__ (1)));
6extern char *strcpy (char *__restrict __dest, __const char *__restrict __src)
7     __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1, 2)));
8extern char *getenv (__const char *__name) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
9extern int access (__const char *__name, int __type) __attribute__ ((__nothrow__)) __attribute__ ((__nonnull__ (1)));
10extern void * xmalloc (__SIZE_TYPE__) __attribute__ ((__malloc__));
11
12static __inline__ const char *
13try (const char *dir, const char *base)
14{
15  if (base != 0)
16    return base;
17  if (dir != 0
18      && access (dir, 4 | 2 | 1) == 0)
19    return dir;
20  return 0;
21}
22
23static const char tmp[] = { '/', 't', 'm', 'p', 0 };
24static const char usrtmp[] =
25{ '/', 'u', 's', 'r', '/', 't', 'm', 'p', 0 };
26static const char vartmp[] =
27{ '/', 'v', 'a', 'r', '/', 't', 'm', 'p', 0 };
28
29static char *memoized_tmpdir;
30char *
31choose_tmpdir (void)
32{
33  const char *base = 0;
34  char *tmpdir;
35  unsigned int len;
36
37  if (memoized_tmpdir)
38    return memoized_tmpdir;
39
40  base = try (getenv ("TMPDIR"), base);
41  base = try (getenv ("TMP"), base);
42  base = try (getenv ("TEMP"), base);
43
44
45  base = try ("/tmp", base);
46
47
48
49  base = try (vartmp, base);
50  base = try (usrtmp, base);
51  base = try (tmp, base);
52
53
54  if (base == 0)
55    base = ".";
56
57
58
59  len = strlen (base);
60  tmpdir = xmalloc (len + 2);
61  strcpy (tmpdir, base);
62  /* Alias analysis was associating read-only memory tags to pointers
63     that are not read-only.  We would then not issue any V_MAY_DEF in
64     this store.  */
65  tmpdir[len] = '/';
66  tmpdir[len+1] = '\0';
67
68  memoized_tmpdir = tmpdir;
69  return tmpdir;
70}
71