Add mkstemp() for those poor souls without it.

diff --git a/mkstemp.c b/mkstemp.c
new file mode 100644 (file)
index 0000000..1ed924a
--- /dev/null
+++ b/mkstemp.c
@@ -0,0 +1,202 @@
+/*     $OpenBSD: mktemp.c,v 1.19 2005/08/08 08:05:36 espie Exp $       */
+
+/*
+ * Copyright (c) 2000, 2001, 2005 Todd C. Miller <Todd.Miller@courtesan.com>
+ * Copyright (c) 1987, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#if defined(TIME_WITH_SYS_TIME) || defined(HAVE_SYS_TIME_H)
+# include <sys/time.h>
+#endif
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+# include <stdlib.h>
+#endif /* HAVE_STDLIB_H */
+#include <ctype.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+
+#include "sudo.h"
+
+#ifndef lint
+static const char rcsid[] = "$Sudo$";
+#endif /* not lint */
+
+static unsigned int get_random __P((void));
+static void seed_random __P((void));
+
+int
+mkstemp(path)
+       char *path;
+{
+       char *start, *trv;
+       struct stat sbuf;
+       int fd, rval;
+       pid_t pid;
+       char *alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+       if (*path == '\0') {
+               errno = EINVAL;
+               return (-1);            /* zero length path */
+       }
+       pid = getpid();
+       for (trv = path; *trv; ++trv)
+               ;
+       --trv;
+       while (trv >= path && *trv == 'X' && pid != 0) {
+               *trv-- = (pid % 10) + '0';
+               pid /= 10;
+       }
+       while (trv >= path && *trv == 'X') {
+               char c;
+
+               /* assumes pid_t is at least 16 bits */
+               pid = (get_random() & 0xffff) % (26 + 26);
+               c = alphabet[pid];
+               *trv-- = c;
+       }
+       start = trv + 1;
+
+       /*
+        * check the target directory; if you have six X's and it
+        * doesn't exist this runs for a *very* long time.
+        */
+       for (;; --trv) {
+               if (trv <= path)
+                       break;
+               if (*trv == '/') {
+                       *trv = '\0';
+                       rval = stat(path, &sbuf);
+                       *trv = '/';
+                       if (rval != 0)
+                               return (-1);
+                       if (!S_ISDIR(sbuf.st_mode)) {
+                               errno = ENOTDIR;
+                               return (-1);
+                       }
+                       break;
+               }
+       }
+
+       for (;;) {
+               if ((fd = open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
+                       return (fd);
+               if (errno != EEXIST)
+                       return (-1);
+
+               /* tricky little algorithm for backward compatibility */
+               for (trv = start;;) {
+                       if (!*trv)
+                               return (-1);
+                       if (*trv == 'Z')
+                               *trv++ = 'a';
+                       else {
+                               if (isdigit((unsigned char)(*trv)))
+                                       *trv = 'a';
+                               else if (*trv == 'z')   /* wrap from z to A */
+                                       *trv = 'A';
+                               else {
+#ifdef HAVE_EBCDIC
+                                       switch(*trv) {
+                                       case 'i':
+                                               *trv = 'j';
+                                               break;
+                                       case 'r':
+                                               *trv = 's';
+                                               break;
+                                       case 'I':
+                                               *trv = 'J';
+                                               break;
+                                       case 'R':
+                                               *trv = 'S';
+                                               break;
+                                       default:
+                                               ++*trv;
+                                               break;
+                                       }
+#else
+                                       ++*trv;
+#endif
+                               }
+                               break;
+                       }
+               }
+       }
+       /*NOTREACHED*/
+}
+
+#ifdef HAVE_RANDOM
+# define RAND          random
+# define SRAND         srandom
+# define SEED_T                unsigned int
+#else
+# ifdef HAVE_LRAND48
+#  define RAND         lrand48
+#  define SRAND                srand48
+#  define SEED_T       long
+# else
+#  define RAND         rand
+#  define SRAND                srand
+#  define SEED_T       unsigned int
+# endif
+#endif
+
+static void
+seed_random()
+{
+       SEED_T seed;
+       struct timespec ts;
+
+       /*
+        * Seed from time of day and process id multiplied by small primes.
+        */
+       (void) gettime(&ts);
+       seed = (ts.tv_sec % 10000) * 523 + ts.tv_nsec / 1000 * 13 +
+           (getpid() % 1000) * 983;
+       SRAND(seed);
+}
+
+static unsigned int
+get_random()
+{
+       static int initialized;
+
+       if (!initialized) {
+               seed_random();
+               initialized = 1;
+       }
+
+       return(RAND() & 0xffffffff);
+}