Provide mkdtemp() for systems without it.

compat/mktemp.c

@@ -41,6 +41,9 @@
 static unsigned int get_random(void);
 static void seed_random(void);
 
+#define MKTEMP_FILE	1
+#define MKTEMP_DIR	2
+
 #define TEMPCHARS	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
 #define NUM_CHARS	(sizeof(TEMPCHARS) - 1)
 
@@ -48,8 +51,26 @@ static void seed_random(void);
 #define INT_MAX	0x7fffffff
 #endif
 
+#ifndef HAVE_MKSTEMPS
 int
 mkstemps(char *path, int slen)
+{
+	return(mktemp_internal(path, slen, MKTEMP_FILE));
+}
+#endif /* HAVE_MKSTEMPS */
+
+#ifndef HAVE_MKDTEMP
+char *
+mkdtemp(char *path)
+{
+	if (mktemp_internal(path, 0, MKTEMP_DIR) == -1)
+		return(NULL);
+	return(path);
+}
+#endif /* HAVE_MKDTEMP */
+
+int
+mktemp_internal(char *path, int slen, int mode)
 {
 	char *start, *cp, *ep;
 	const char *tempchars = TEMPCHARS;
@@ -77,9 +98,19 @@ mkstemps(char *path, int slen)
 			*cp = tempchars[r];
 		}
 
-		fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
-		if (fd != -1 || errno != EEXIST)
-			return(fd);
+		switch (mode) {
+		case MKTEMP_FILE:
+			fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
+			if (fd != -1 || errno != EEXIST)
+				return(fd);
+			break;
+		case MKTEMP_DIR:
+			if (mkdir(path, S_IRWXU) == 0)
+				return(0);
+			if (errno != EEXIST)
+				return(-1);
+			break;
+		}
 	} while (--tries);
 
 	errno = EEXIST;

config.h.in

@@ -331,6 +331,9 @@
 /* Define to 1 if you have the `memrchr' function. */
 #undef HAVE_MEMRCHR
 
+/* Define to 1 if you have the `mkdtemp' function. */
+#undef HAVE_MKDTEMP
+
 /* Define to 1 if you have the `mkstemps' function. */
 #undef HAVE_MKSTEMPS
 

configure

@@ -15684,12 +15684,14 @@ fi
 fi
 done
 
-for ac_func in mkstemps
+for ac_func in mkstemps mkdtemp
 do :
-  ac_fn_c_check_func "$LINENO" "mkstemps" "ac_cv_func_mkstemps"
-if test "x$ac_cv_func_mkstemps" = x""yes; then :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+eval as_val=\$$as_ac_var
+   if test "x$as_val" = x""yes; then :
   cat >>confdefs.h <<_ACEOF
-#define HAVE_MKSTEMPS 1
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
 _ACEOF
 
 else
@@ -15708,8 +15710,8 @@ fi
 done
 
     case " $LIBOBJS " in
-  *" mkstemps.$ac_objext "* ) ;;
-  *) LIBOBJS="$LIBOBJS mkstemps.$ac_objext"
+  *" mkstemp.$ac_objext "* ) ;;
+  *) LIBOBJS="$LIBOBJS mkstemp.$ac_objext"
  ;;
 esac
 

configure.in

@@ -2004,9 +2004,9 @@ AC_CHECK_FUNCS(closefrom, [], [AC_LIBOBJ(closefrom)
 	[ #include <limits.h>
 	  #include <fcntl.h> ])
 ])
-AC_CHECK_FUNCS(mkstemps, [], [
+AC_CHECK_FUNCS(mkstemps mkdtemp, [], [
     AC_CHECK_FUNCS(random lrand48, [break])
-    AC_LIBOBJ(mkstemps)
+    AC_LIBOBJ(mkstemp)
 ])
 AC_CHECK_FUNCS(snprintf vsnprintf asprintf vasprintf, , [NEED_SNPRINTF=1])
 if test X"$ac_cv_type_struct_timespec" != X"no"; then

include/missing.h

@@ -316,6 +316,9 @@ size_t strlcpy(char *, const char *, size_t);
 #ifndef HAVE_MEMRCHR
 void *memrchr(const void *, int, size_t);
 #endif
+#ifndef HAVE_MKDTEMP
+char *mkdtemp(char *);
+#endif
 #ifndef HAVE_MKSTEMPS
 int mkstemps(char *, int);
 #endif