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29 * @(#)mktemp.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/stdio/mktemp.c,v 1.31 2008/07/28 21:18:59 jhb Exp $
31 * $DragonFly: src/lib/libc/stdio/mktemp.c,v 1.7 2005/11/20 11:07:30 swildner Exp $
34 #include "namespace.h"
35 #include <sys/param.h>
44 #include "un-namespace.h"
46 char *_mktemp(char *);
48 static int _gettemp(char *, int *, int, int);
50 static const unsigned char padchar[] =
51 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
54 mkstemps(char *path, int slen)
58 return (_gettemp(path, &fd, 0, slen) ? fd : -1);
66 return (_gettemp(path, &fd, 0, 0) ? fd : -1);
72 return (_gettemp(path, NULL, 1, 0) ? path : NULL);
78 return (_gettemp(path, NULL, 0, 0) ? path : NULL);
81 __warn_references(mktemp,
82 "warning: mktemp() possibly used unsafely; consider using mkstemp()");
87 return (_mktemp(path));
91 _gettemp(char *path, int *doopen, int domkdir, int slen)
93 char *start, *trv, *suffp, *carryp;
98 char carrybuf[MAXPATHLEN];
100 if ((doopen != NULL && domkdir) || slen < 0) {
105 for (trv = path; *trv != '\0'; ++trv)
110 if (trv < path || NULL != strchr(suffp, '/')) {
115 /* Fill space with random characters */
116 while (trv >= path && *trv == 'X') {
117 rand = arc4random_uniform(sizeof(padchar) - 1);
118 *trv-- = padchar[rand];
122 /* save first combination of random characters */
123 memcpy(carrybuf, start, suffp - start);
126 * check the target directory.
128 if (doopen != NULL || domkdir) {
129 for (; trv > path; --trv) {
132 rval = stat(path, &sbuf);
136 if (!S_ISDIR(sbuf.st_mode)) {
148 _open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
152 } else if (domkdir) {
153 if (mkdir(path, 0700) == 0)
157 } else if (lstat(path, &sbuf))
158 return (errno == ENOENT);
160 /* If we have a collision, cycle through the space of filenames */
161 for (trv = start, carryp = carrybuf;;) {
162 /* have we tried all possible permutations? */
164 return (0); /* yes - exit with EEXIST */
165 pad = strchr(padchar, *trv);
167 /* this should never happen */
171 /* increment character */
172 *trv = (*++pad == '\0') ? padchar[0] : *pad;
173 /* carry to next position? */
174 if (*trv == *carryp) {
175 /* increment position and loop */
179 /* try with new name */