1 files changed, 129 insertions, 0 deletions
diff --git a/file_io/unix/tempdir.c b/file_io/unix/tempdir.c
new file mode 100644
index 0000000..22325ef
--- /dev/null
+++ b/file_io/unix/tempdir.c
@@ -0,0 +1,129 @@
+/* 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.
+ */
+#include "apr_private.h"
+#include "apr_file_io.h"
+#include "apr_strings.h"
+#include "apr_env.h"
+
+
+/* Try to open a temporary file in the temporary dir, write to it,
+   and then close it. */
+static int test_tempdir(const char *temp_dir, apr_pool_t *p)
+{
+    apr_file_t *dummy_file;
+    char *path = apr_pstrcat(p, temp_dir, "/apr-tmp.XXXXXX", NULL);
+
+    if (apr_file_mktemp(&dummy_file, path, 0, p) == APR_SUCCESS) {
+        if (apr_file_putc('!', dummy_file) == APR_SUCCESS) {
+            if (apr_file_close(dummy_file) == APR_SUCCESS) {
+                return 1;
+            }
+        }
+    }
+    return 0;
+}
+
+
+APR_DECLARE(apr_status_t) apr_temp_dir_get(const char **temp_dir, 
+                                           apr_pool_t *p)
+{
+    apr_status_t apr_err;
+    const char *try_dirs[] = { "/tmp", "/usr/tmp", "/var/tmp" };
+    const char *try_envs[] = { "TMPDIR", "TMP", "TEMP"};
+    const char *dir;
+    char *cwd;
+    int i;
+
+    /* Our goal is to find a temporary directory suitable for writing
+       into.
+       Here's the order in which we'll try various paths:
+
+          $TMPDIR
+          $TMP
+          $TEMP
+          "C:\TEMP"     (windows only)
+          "SYS:\TMP"    (netware only)
+          "/tmp"
+          "/var/tmp"
+          "/usr/tmp"
+          P_tmpdir      (POSIX define)
+          `pwd` 
+
+       NOTE: This algorithm is basically the same one used by Python
+       2.2's tempfile.py module.  */
+
+    /* Try the environment first. */
+    for (i = 0; i < (sizeof(try_envs) / sizeof(const char *)); i++) {
+        char *value;
+        apr_err = apr_env_get(&value, try_envs[i], p);
+        if ((apr_err == APR_SUCCESS) && value) {
+            apr_size_t len = strlen(value);
+            if (len && (len < APR_PATH_MAX) && test_tempdir(value, p)) {
+                dir = value;
+                goto end;
+            }
+        }
+    }
+
+#ifdef WIN32
+    /* Next, on Win32, try the C:\TEMP directory. */
+    if (test_tempdir("C:\\TEMP", p)) {
+        dir = "C:\\TEMP";
+        goto end;
+    }
+#endif
+#ifdef NETWARE
+    /* Next, on NetWare, try the SYS:/TMP directory. */
+    if (test_tempdir("SYS:/TMP", p)) {
+        dir = "SYS:/TMP";
+        goto end;
+    }
+#endif
+
+    /* Next, try a set of hard-coded paths. */
+    for (i = 0; i < (sizeof(try_dirs) / sizeof(const char *)); i++) {
+        if (test_tempdir(try_dirs[i], p)) {
+            dir = try_dirs[i];
+            goto end;
+        }
+    }
+
+#ifdef P_tmpdir
+    /* 
+     * If we have it, use the POSIX definition of where 
+     * the tmpdir should be 
+     */
+    if (test_tempdir(P_tmpdir, p)) {
+        dir = P_tmpdir;
+        goto end;
+    }
+#endif
+    
+    /* Finally, try the current working directory. */
+    if (APR_SUCCESS == apr_filepath_get(&cwd, APR_FILEPATH_NATIVE, p)) {
+        if (test_tempdir(cwd, p)) {
+            dir = cwd;
+	    goto end;
+        }
+    }
+
+    /* We didn't find a suitable temp dir anywhere */
+    return APR_EGENERAL;
+
+end:
+    *temp_dir = apr_pstrdup(p, dir);
+    return APR_SUCCESS;
+}