system/curl: add a small curl-like HTTP client command

Add the "curl" NSH command: a command-line HTTP client built on top of
the netutils webclient library. It implements a subset of the real curl
options: GET and POST (and other methods via -X), custom request headers
(-H), a raw request body (-d, including -d @file), multipart/form-data
file uploads (-F name=@file), saving the response body to a file (-o)
and verbose output (-v). HTTP only (no HTTPS).

Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>

Author: JorgeGzm

system/curl/CMakeLists.txt

@@ -0,0 +1,33 @@
+# ##############################################################################
+# apps/system/curl/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# 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.
+#
+# ##############################################################################
+
+if(CONFIG_SYSTEM_CURL)
+  nuttx_add_application(
+    NAME
+    ${CONFIG_SYSTEM_CURL_PROGNAME}
+    SRCS
+    curl_main.c
+    STACKSIZE
+    ${CONFIG_SYSTEM_CURL_STACKSIZE}
+    PRIORITY
+    ${CONFIG_SYSTEM_CURL_PRIORITY})
+endif()

system/curl/Kconfig

@@ -0,0 +1,42 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config SYSTEM_CURL
+	tristate "curl HTTP command"
+	default n
+	depends on NETUTILS_WEBCLIENT
+	---help---
+		Enable the "curl" command: a small command-line HTTP client
+		supporting GET and POST (and other methods via -X), custom
+		headers (-H), a raw request body (-d, including -d @file) and
+		multipart/form-data file uploads (-F name=@file), built on top
+		of the netutils webclient library. HTTP only (no HTTPS).
+
+if SYSTEM_CURL
+
+config SYSTEM_CURL_PROGNAME
+	string "Program name"
+	default "curl"
+	---help---
+		This is the name of the program that will be used when the
+		NSH ELF program is installed.
+
+config SYSTEM_CURL_PRIORITY
+	int "curl task priority"
+	default 100
+
+config SYSTEM_CURL_STACKSIZE
+	int "curl stack size"
+	default DEFAULT_TASK_STACKSIZE
+
+config SYSTEM_CURL_BUFFERSIZE
+	int "curl transfer buffer size"
+	default 512
+	---help---
+		Size of the buffer used to hold the request/response headers and
+		to stream body data. It must be large enough to hold the whole
+		request header line and the whole response header.
+
+endif

system/curl/Make.defs

@@ -0,0 +1,25 @@
+############################################################################
+# apps/system/curl/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# 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.
+#
+############################################################################
+
+ifneq ($(CONFIG_SYSTEM_CURL),)
+CONFIGURED_APPS += $(APPDIR)/system/curl
+endif

system/curl/Makefile

@@ -0,0 +1,36 @@
+############################################################################
+# apps/system/curl/Makefile
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# 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 $(APPDIR)/Make.defs
+
+# curl built-in application info
+
+PROGNAME  = $(CONFIG_SYSTEM_CURL_PROGNAME)
+PRIORITY  = $(CONFIG_SYSTEM_CURL_PRIORITY)
+STACKSIZE = $(CONFIG_SYSTEM_CURL_STACKSIZE)
+MODULE    = $(CONFIG_SYSTEM_CURL)
+
+# curl command
+
+MAINSRC = curl_main.c
+
+include $(APPDIR)/Application.mk