roken: Add mkdtemp()

cf/roken-frag.m4

@@ -195,6 +195,7 @@ AC_CHECK_FUNCS([				\
 	getspnam				\
 	issetugid				\
 	memmem					\
+	mkdtemp					\
 	mkostemp				\
 	on_exit					\
 	poll					\

lib/roken/Makefile.am

@@ -116,6 +116,7 @@ libroken_la_SOURCES =		\
 	memmem.c		\
 	mini_inetd.c		\
 	mkdir.c                 \
+	mkdtemp.c               \
 	mkostemp.c              \
 	net_read.c		\
 	net_write.c		\

lib/roken/NTMakefile

@@ -78,6 +78,7 @@ libroken_la_OBJS =			\
 	$(OBJ)\memset_s.obj 		\
 	$(OBJ)\mkdir.obj                \
 	$(OBJ)\mini_inetd.obj		\
+	$(OBJ)\mkdtemp.obj		\
 	$(OBJ)\mkstemp.obj		\
 	$(OBJ)\mkostemp.obj		\
 	$(OBJ)\net_read.obj		\

lib/roken/mkdtemp.c

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2020 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * 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 Institute 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 INSTITUTE 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 INSTITUTE 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/stat.h>
+#include <sys/types.h>
+#include <string.h>
+#include <errno.h>
+
+#include <roken.h>
+
+#ifndef O_APPEND
+#define O_APPEND 0
+#endif
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#endif
+#ifndef O_SYNC
+#define O_SYNC 0
+#endif
+
+#ifndef HAVE_MKDTEMP
+ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
+mkdtemp(char *template)
+{
+    size_t len = strlen(template) - 1;
+    size_t start, i;
+    pid_t val = getpid();
+
+    for (i = 0; i < len && i < 7 && template[len - i] == 'X'; i++) {
+	template[len] = '0' + val % 10;
+	val /= 10;
+	len--;
+        if (!val)
+            val = getpid();
+    }
+
+    if (i < 6) {
+        errno = EINVAL;
+        return NULL;
+    }
+
+    start = len - i;
+    do {
+        if (mkdir(template, 0700) == 0)
+            return template;
+	for (i = start + 1; i < len; i++) {
+	    if (++(template[i]) == '9' + 1)
+		template[i] = 'a';
+	    if (template[i] <= 'z')
+		break;
+	    template[i] = 'a';
+	}
+    } while(1);
+}
+#endif

lib/roken/roken.h.in

@@ -708,6 +708,11 @@ ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL mkstemp(char *);
 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL mkostemp(char *, int);
 #endif
 
+#ifndef HAVE_MKDTEMP
+#define mkdtemp rk_mkdtemp
+ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL mkdtemp(char *);
+#endif
+
 #ifndef HAVE_CGETENT
 #define cgetent rk_cgetent
 #define cgetstr rk_cgetstr

lib/roken/version-script.map

@@ -88,6 +88,7 @@ HEIMDAL_ROKEN_2.0 {
 		rk_memmem;
 		rk_memset_s;
 		rk_mkdir;
+		rk_mkdtemp;
 		rk_mkostemp;
 		rk_mkstemp;
 		rk_parse_flags;