Rework source layout in preparation for modular sudo.

compat/mkstemp.c

@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2001, 2003, 2008 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.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"
+
+static unsigned int get_random __P((void));
+static void seed_random __P((void));
+
+int
+mkstemp(path)
+	char *path;
+{
+	char *start, *cp;
+	int fd, r;
+	char *alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+	if (*path == '\0') {
+		errno = EINVAL;
+		return(0);
+	}
+
+	for (cp = path; *cp; cp++)
+		;
+	do {
+		cp--;
+	} while (cp >= path && *cp == 'X');
+	start = cp + 1;
+
+	for (;;) {
+		for (cp = start; *cp; cp++) {
+			r = get_random % (26 + 26);
+			*cp = alphabet[r];
+		}
+
+		fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
+		if (fd != -1 || errno != EEXIST)
+			return(fd);
+	}
+	/*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);
+}