[incubator-nuttx] 03/03: libs/libc/stdlib: Implement mkdtemp(3) syscall

[xi...@apache.org]

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in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git

commit 216c33a5c714619b07772c38a816d92cf3040dee
Author: chao.an <an...@xiaomi.com>
AuthorDate: Sat Aug 29 12:18:13 2020 +0800

    libs/libc/stdlib: Implement mkdtemp(3) syscall
    
    See the reference here:
    https://pubs.opengroup.org/onlinepubs/9699919799/functions/mkdtemp.html
    
    Change-Id: I49081ecafc011a843e6067b1118b53bf65d4418b
    Signed-off-by: chao.an <an...@xiaomi.com>
---
 include/stdlib.h               |  1 +
 libs/libc/stdlib/Make.defs     |  2 +-
 libs/libc/stdlib/lib_mkdtemp.c | 87 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 89 insertions(+), 1 deletion(-)

diff --git a/include/stdlib.h b/include/stdlib.h
index feab8a0..3eaf0e2 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -237,6 +237,7 @@ lldiv_t   lldiv(long long number, long long denom);
 
 FAR char *mktemp(FAR char *path_template);
 int       mkstemp(FAR char *path_template);
+FAR char *mkdtemp(FAR char *path_template);
 
 /* Sorting */
 
diff --git a/libs/libc/stdlib/Make.defs b/libs/libc/stdlib/Make.defs
index 22e33d9..2a5bcb7 100644
--- a/libs/libc/stdlib/Make.defs
+++ b/libs/libc/stdlib/Make.defs
@@ -25,7 +25,7 @@ CSRCS += lib_atol.c lib_atoll.c lib_div.c lib_ldiv.c lib_lldiv.c lib_Exit.c
 CSRCS += lib_itoa.c lib_labs.c lib_llabs.c lib_realpath.c lib_bsearch.c
 CSRCS += lib_rand.c lib_posix_memalign.c lib_qsort.c lib_srand.c lib_strtol.c
 CSRCS += lib_strtoll.c lib_strtoul.c lib_strtoull.c lib_strtod.c lib_strtof.c
-CSRCS += lib_strtold.c lib_checkbase.c lib_mktemp.c lib_mkstemp.c
+CSRCS += lib_strtold.c lib_checkbase.c lib_mktemp.c lib_mkstemp.c lib_mkdtemp.c
 
 ifeq ($(CONFIG_LIBC_WCHAR),y)
 CSRCS += lib_mblen.c lib_mbtowc.c lib_wctomb.c
diff --git a/libs/libc/stdlib/lib_mkdtemp.c b/libs/libc/stdlib/lib_mkdtemp.c
new file mode 100644
index 0000000..59e7a14
--- /dev/null
+++ b/libs/libc/stdlib/lib_mkdtemp.c
@@ -0,0 +1,87 @@
+/****************************************************************************
+ * libs/libc/stdlib/lib_mkdtemp.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <unistd.h>
+#include <stdlib.h>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+/****************************************************************************
+ * Pre-processor definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: mkdtemp
+ *
+ * Description:
+ *  The mkdtemp() function shall create a directory with a unique name
+ *  derived from template. The application shall ensure that the string
+ *  provided in template is a pathname ending with at least six trailing
+ *  'X' characters. The mkdtemp() function shall modify the contents of
+ *  template by replacing six or more 'X' characters at the end of the
+ *  pathname with the same number of characters from the portable filename
+ *  character set. The characters shall be chosen such that the resulting
+ *  pathname does not duplicate the name of an existing file at the time
+ *  of the call to mkdtemp(). The mkdtemp() function shall use the
+ *  resulting pathname to create the new directory as if by a call to:
+ *
+ * Input Parameters:
+ *   template - The base directory name that will be modified to produce
+ *     the unique name. This must be a full path beginning with /tmp.
+ *     This function will modify only the first XXXXXX characters within
+ *     that full path.
+ *
+ * Returned Value:
+ *   Upon successful completion, the mkdtemp() function shall return the
+ *   value of template. Otherwise, it shall return a null pointer and
+ *   shall set errno to indicate the error.
+ *
+ ****************************************************************************/
+
+FAR char *mkdtemp(FAR char *path_template)
+{
+  FAR char *path = mktemp(path_template);
+
+  if (path)
+    {
+      if (mkdir(path, S_IRWXU) < 0)
+        {
+          path = NULL;
+        }
+    }
+
+  return path;
+}