mkstemp

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1764 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/roken/mkstemp.c

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska H<>gskolan
+ * (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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the Kungliga Tekniska
+ *      H<>gskolan and its contributors.
+ * 
+ * 4. 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#include <errno.h>
+
+RCSID("$Id$");
+
+#ifndef HAVE_MKSTEMP
+
+int
+mkstemp(char *template)
+{
+    int i, j;
+    unsigned long val;
+    val = getpid();
+    i = strlen(template) - 1;
+    while(template[i] == 'X') {
+	template[i] = '0' + val % 10;
+	val /= 10;
+	i--;
+    }
+    
+    do{
+	int fd;
+	fd = open(template, O_RDWR | O_CREAT | O_EXCL, 0600);
+	if(fd >= 0)
+	    return fd;
+	if(fd < 0 && errno != EEXIST)
+	    return -1;
+	j = i + 1;
+	do{
+	    if(template[j] == 0)
+		return -1;
+	    template[j]++;
+	    if(template[j] == '9' + 1)
+		template[j] = 'a';
+	    if(template[j] <= 'z')
+		break;
+	    template[j] = 'a';
+	    j++;
+	}while(1);
+    }while(1);
+}
+
+#endif