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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 #pragma weak _tempnam = tempnam
33
34 #include "lint.h"
35 #include <mtlib.h>
36 #include <sys/types.h>
37 #include <stdio.h>
38 #include <string.h>
39 #include <stdlib.h>
40 #include <thread.h>
41 #include <synch.h>
42 #include <unistd.h>
43 #include <sys/stat.h>
44
45 #define max(A, B) (((A) < (B))?(B):(A))
46
47 static char *pcopy(char *, const char *);
48
49 static char seed[] = "AAA";
50
51 static mutex_t seed_lk = DEFAULTMUTEX;
52
53 char *
tempnam(const char * dir,const char * pfx)54 tempnam(const char *dir, /* use this directory please (if non-NULL) */
55 const char *pfx) /* use this (if non-NULL) as filename prefix */
56 {
57 char *p, *q, *tdir;
58 size_t x = 0, y = 0, z;
59 struct stat64 statbuf;
60
61 z = sizeof (P_tmpdir) - 1;
62 if ((tdir = getenv("TMPDIR")) != NULL) {
63 x = strlen(tdir);
64 }
65 if (dir != NULL) {
66 if (stat64(dir, &statbuf) == 0 && S_ISDIR(statbuf.st_mode))
67 y = strlen(dir);
68 }
69 if ((p = malloc(max(max(x, y), z)+16)) == NULL)
70 return (NULL);
71 if (x > 0 && access(pcopy(p, tdir), (W_OK | X_OK)) == 0)
72 goto OK;
73 if (y > 0 && access(pcopy(p, dir), (W_OK | X_OK)) == 0)
74 goto OK;
75 if (access(pcopy(p, P_tmpdir), (W_OK | X_OK)) == 0)
76 goto OK;
77 if (access(pcopy(p, "/tmp"), (W_OK | X_OK)) != 0) {
78 free(p);
79 return (NULL);
80 }
81 OK:
82 (void) strcat(p, "/");
83 if (pfx) {
84 *(p+strlen(p)+5) = '\0';
85 (void) strncat(p, pfx, 5);
86 }
87 lmutex_lock(&seed_lk);
88 (void) strcat(p, seed);
89 (void) strcat(p, "XXXXXX");
90 q = seed;
91 while (*q == 'Z')
92 *q++ = 'A';
93 if (*q != '\0')
94 ++*q;
95 lmutex_unlock(&seed_lk);
96 if (*mktemp(p) == '\0') {
97 free(p);
98 return (NULL);
99 }
100 return (p);
101 }
102
103 static char *
pcopy(char * space,const char * arg)104 pcopy(char *space, const char *arg)
105 {
106 char *p;
107
108 if (arg) {
109 (void) strcpy(space, arg);
110 p = space-1+strlen(space);
111 while ((p >= space) && (*p == '/'))
112 *p-- = '\0';
113 }
114 return (space);
115 }
116