Add MG_ARCH_FREERTOS_LWIP

docs/README.md

@@ -203,7 +203,7 @@ option during build time, use the `-D OPTION` compiler flag:
 ```sh
 $ cc app0.c mongoose.c                                        # Use defaults!
 $ cc app1.c mongoose.c -D MG_ENABLE_IPV6=1                    # Build with IPv6 enabled
-$ cc app2.c mongoose.c -D MG_ARCH=MG_ARCH_UNIX                # Set UNIX architecture
+$ cc app2.c mongoose.c -D MG_ARCH=MG_ARCH_FREERTOS_LWIP       # Set architecture
 $ cc app3.c mongoose.c -D MG_ENABLE_FS=0 -D MG_ENABLE_LOG=0   # Multiple options
 ```
 
@@ -219,6 +219,7 @@ architecture is guessed during the build, so setting it is not usually required.
 |MG_ARCH_WIN32 | Windows systems |
 |MG_ARCH_ESP32 | Espressif's ESP32 |
 |MG_ARCH_ESP8266 | Espressif's ESP8266 |
+|MG_ARCH_FREERTOS_LWIP | All systems with FreeRTOS kernel and LwIP IP stack |
 |MG_ARCH_FREERTOS_TCP | All systems with FreeRTOS kernel and FreeRTOS-Plus-TCP IP stack |
 |MG_ARCH_CUSTOM | A custom architecture, discussed in the next section |
 
@@ -264,34 +265,12 @@ systems, follow the guideline outlined below:
 2. Create a file called `mongoose_custom.h`, with defines and includes that
 are relevant to your platform. Mongoose uses `bool` type, `MG_DIRSEP` define,
 and optionally other structures like `DIR *` depending on the functionality
-you have enabled - see previous section. Below is an example for FreeRTOS+LWIP:
-
-```c
-#include <stdarg.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <time.h>
-#include <unistd.h>
-
-#include <FreeRTOS.h>
-#include <task.h>
-
-#include <lwip/sockets.h>
-
-#define MG_INT64_FMT "%lld"
-#define MG_DIRSEP '/'
-```
-
-And this one is for bare metal and custom TCP/IP stack:
+you have enabled - see previous section. Below is an example:
 
 ```c
 #include <stdbool.h>            // For bool
-#include <MySystem.h>
+#include <stdarg.h>
+
 #define MG_DIRSEP '/'
 #define MG_INT64_FMT "%lld"
 #define MG_ENABLE_SOCKET 0      // Disable BSD socket API, implement your own

mongoose.c

@@ -4198,7 +4198,7 @@ void mg_usleep(unsigned long usecs) {
   Sleep(usecs / 1000);
 #elif MG_ARCH == MG_ARCH_ESP8266
   ets_delay_us(usecs);
-#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_FREERTOS_LWIP
   vTaskDelay(pdMS_TO_TICKS(usecs / 1000));
 #else
   usleep((useconds_t) usecs);
@@ -4212,7 +4212,7 @@ unsigned long mg_millis(void) {
   return esp_timer_get_time() / 1000;
 #elif MG_ARCH == MG_ARCH_ESP8266
   return xTaskGetTickCount() * portTICK_PERIOD_MS;
-#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_FREERTOS_LWIP
   return xTaskGetTickCount() * portTICK_PERIOD_MS;
 #else
   struct timespec ts;

mongoose.h

@@ -24,6 +24,7 @@
 #define MG_ARCH_ESP32 3
 #define MG_ARCH_ESP8266 4
 #define MG_ARCH_FREERTOS_TCP 5
+#define MG_ARCH_FREERTOS_LWIP 6
 
 #if !defined(MG_ARCH)
 #if defined(__unix__) || defined(__APPLE__)
@@ -66,6 +67,7 @@
 
 
 
+
 #if MG_ARCH == MG_ARCH_ESP32
 
 #include <ctype.h>
@@ -119,6 +121,41 @@
 #endif
 
 
+#if MG_ARCH == MG_ARCH_FREERTOS_LWIP
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <sys/time.h>
+
+#if MG_ENABLE_FS
+#include <sys/stat.h>
+#endif
+
+#include <FreeRTOS.h>
+#include <task.h>
+
+#include <lwip/sockets.h>
+
+#define MG_INT64_FMT "%lld"
+#define MG_DIRSEP '/'
+
+// Re-route calloc/free to the FreeRTOS's functions, don't use stdlib
+static inline void *mg_calloc(int cnt, size_t size) {
+  void *p = pvPortMalloc(cnt * size);
+  if (p != NULL) memset(p, 0, size);
+  return p;
+}
+#define calloc(a, b) mg_calloc((a), (b))
+#define free(a) vPortFree(a)
+#define malloc(a) pvPortMalloc(a)
+
+#define gmtime_r(a, b) gmtime(a)
+
+#endif  // MG_ARCH == MG_ARCH_FREERTOS_LWIP
+
+
 #if MG_ARCH == MG_ARCH_FREERTOS_TCP
 
 #include <ctype.h>

src/arch.h

@@ -6,6 +6,7 @@
 #define MG_ARCH_ESP32 3
 #define MG_ARCH_ESP8266 4
 #define MG_ARCH_FREERTOS_TCP 5
+#define MG_ARCH_FREERTOS_LWIP 6
 
 #if !defined(MG_ARCH)
 #if defined(__unix__) || defined(__APPLE__)
@@ -43,6 +44,7 @@
 
 #include "arch_esp32.h"
 #include "arch_esp8266.h"
+#include "arch_freertos_lwip.h"
 #include "arch_freertos_tcp.h"
 #include "arch_unix.h"
 #include "arch_win32.h"

src/arch_freertos_lwip.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#if MG_ARCH == MG_ARCH_FREERTOS_LWIP
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#if defined(__GNUC__)
+#include <sys/time.h>
+#else
+typedef long suseconds_t;
+struct timeval {
+  time_t tv_sec;
+  suseconds_t tv_usec;
+};
+#endif
+
+#if MG_ENABLE_FS
+#include <sys/stat.h>
+#endif
+
+#include <FreeRTOS.h>
+#include <task.h>
+
+#include <lwip/sockets.h>
+
+#define MG_INT64_FMT "%lld"
+#define MG_DIRSEP '/'
+
+// Re-route calloc/free to the FreeRTOS's functions, don't use stdlib
+static inline void *mg_calloc(int cnt, size_t size) {
+  void *p = pvPortMalloc(cnt * size);
+  if (p != NULL) memset(p, 0, size);
+  return p;
+}
+#define calloc(a, b) mg_calloc((a), (b))
+#define free(a) vPortFree(a)
+#define malloc(a) pvPortMalloc(a)
+
+#define gmtime_r(a, b) gmtime(a)
+
+#endif  // MG_ARCH == MG_ARCH_FREERTOS_LWIP

src/util.c

@@ -323,7 +323,7 @@ void mg_usleep(unsigned long usecs) {
   Sleep(usecs / 1000);
 #elif MG_ARCH == MG_ARCH_ESP8266
   ets_delay_us(usecs);
-#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_FREERTOS_LWIP
   vTaskDelay(pdMS_TO_TICKS(usecs / 1000));
 #else
   usleep((useconds_t) usecs);
@@ -337,7 +337,7 @@ unsigned long mg_millis(void) {
   return esp_timer_get_time() / 1000;
 #elif MG_ARCH == MG_ARCH_ESP8266
   return xTaskGetTickCount() * portTICK_PERIOD_MS;
-#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_FREERTOS_LWIP
   return xTaskGetTickCount() * portTICK_PERIOD_MS;
 #else
   struct timespec ts;