Diff: simple-mbed-cloud-client/mbed-cloud-client/mbed-client/source/uriqueryparser.c

Revision:

0:977e87915078

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/simple-mbed-cloud-client/mbed-cloud-client/mbed-client/source/uriqueryparser.c	Wed Aug 28 19:24:56 2019 +0000
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2018 ARM Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ * Licensed 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 <stdlib.h>
+#include <string.h>
+#include "assert.h"
+#include "mbed-client/uriqueryparser.h"
+
+// Use int return value instead of ssize_t since we don't have it for all platforms
+int parse_query_parameter_value_from_uri(const char *uri, const char *parameter_name, const char **parameter_value)
+{
+    assert(uri);
+    assert(parameter_name);
+    assert(parameter_value);
+
+    *parameter_value = NULL;
+
+    char *value_ptr = strchr(uri, '?');
+    if (value_ptr == NULL) {
+        return -1;
+    }
+
+    // Skip '?'
+    value_ptr++;
+
+    return parse_query_parameter_value_from_query(value_ptr, parameter_name, parameter_value);
+}
+
+// Use int return value instead of ssize_t since we don't have it for all platforms
+int parse_query_parameter_value_from_query(const char *query, const char *parameter_name, const char **parameter_value)
+{
+    assert(query);
+    assert(parameter_name);
+    assert(parameter_value);
+
+    *parameter_value = NULL;
+    const int param_name_len = strlen(parameter_name);
+    const int query_len = strlen(query);
+
+    if (param_name_len == 0 || query_len == 0) {
+        return -1;
+    }
+
+    const char *value_ptr = query;
+
+    do {
+        value_ptr = strstr(value_ptr, parameter_name);
+
+        // No match at all, then break
+        if (!value_ptr) {
+            break;
+        }
+
+        // Check that match was at the beginning or there is a & before the match
+        if (!(value_ptr == query || *(value_ptr - 1) == '&')) {
+            // Offset value_ptr past the match to find next one
+            value_ptr += param_name_len;
+            continue;
+        }
+
+        // Offset to after parameter name
+        value_ptr += param_name_len;
+
+        // Check that parameter was not at the end
+        if (value_ptr >= query + query_len) {
+            break;
+        }
+
+        // CHeck that there is an '=' after parameter name, continue if not as there might be
+        // another parameter left
+        if (*value_ptr != '=') {
+            continue;
+        }
+
+        *parameter_value = ++value_ptr;
+        break;
+
+    } while (value_ptr);
+
+    // If parameter found, calculate length of value either ending at an '&' or the end
+    if (*parameter_value != NULL) {
+        value_ptr = strchr(*parameter_value, '&');
+        if (value_ptr) {
+            return value_ptr - *parameter_value;
+        }
+        return strlen(*parameter_value);
+    }
+    return -1;
+}