flipperzero-firmware/core/furi/stdglue.c

#include "stdglue.h"
#include "check.h"
#include "memmgr.h"

#include <main.h>
#include <cmsis_os2.h>
#include <stdio.h>
#include <string.h>
#include <m-dict.h>

extern UART_HandleTypeDef DEBUG_UART;

DICT_DEF2(
    FuriStdglueCallbackDict,
    uint32_t,
    M_DEFAULT_OPLIST,
    FuriStdglueWriteCallback,
    M_PTR_OPLIST)

typedef struct {
    osMutexId_t mutex;
    FuriStdglueCallbackDict_t global_outputs;
    FuriStdglueCallbackDict_t thread_outputs;
} FuriStdglue;

static FuriStdglue* furi_stdglue = NULL;

static ssize_t stdout_write(void* _cookie, const char* data, size_t size) {
    assert(furi_stdglue);
    osKernelState_t state = osKernelGetState();
    osThreadId_t thread_id = osThreadGetId();
    if(state == osKernelRunning && thread_id &&
       osMutexAcquire(furi_stdglue->mutex, osWaitForever) == osOK) {
        // We are in the thread context
        // Handle global callbacks
        FuriStdglueCallbackDict_it_t it;
        for(FuriStdglueCallbackDict_it(it, furi_stdglue->global_outputs);
            !FuriStdglueCallbackDict_end_p(it);
            FuriStdglueCallbackDict_next(it)) {
            osThreadId_t it_thread = (osThreadId_t)FuriStdglueCallbackDict_ref(it)->key;
            FuriStdglueWriteCallback it_callback = FuriStdglueCallbackDict_ref(it)->value;
            if(thread_id != it_thread) {
                it_callback(_cookie, data, size);
            }
        }
        // Handle thread callbacks
        FuriStdglueWriteCallback* callback_ptr =
            FuriStdglueCallbackDict_get(furi_stdglue->thread_outputs, (uint32_t)thread_id);
        if(callback_ptr) {
            (*callback_ptr)(_cookie, data, size);
        }
        furi_check(osMutexRelease(furi_stdglue->mutex) == osOK);
    }
    // Flush
    if(data == 0) {
        /*
         * This means that we should flush internal buffers.  Since we
         * don't we just return.  (Remember, "handle" == -1 means that all
         * handles should be flushed.)
         */
        return 0;
    }
    // Debug uart
    HAL_UART_Transmit(&DEBUG_UART, (uint8_t*)data, (uint16_t)size, HAL_MAX_DELAY);
    // All data consumed
    return size;
}

void furi_stdglue_init() {
    furi_stdglue = furi_alloc(sizeof(FuriStdglue));
    // Init outputs structures
    furi_stdglue->mutex = osMutexNew(NULL);
    furi_check(furi_stdglue->mutex);
    FuriStdglueCallbackDict_init(furi_stdglue->global_outputs);
    FuriStdglueCallbackDict_init(furi_stdglue->thread_outputs);
    // Prepare and set stdout descriptor
    FILE* fp = fopencookie(
        NULL,
        "w",
        (cookie_io_functions_t){
            .read = NULL,
            .write = stdout_write,
            .seek = NULL,
            .close = NULL,
        });
    setvbuf(fp, NULL, _IOLBF, 0);
    stdout = fp;
}

bool furi_stdglue_set_global_stdout_callback(FuriStdglueWriteCallback callback) {
    assert(furi_stdglue);
    osThreadId_t thread_id = osThreadGetId();
    if(thread_id) {
        furi_check(osMutexAcquire(furi_stdglue->mutex, osWaitForever) == osOK);
        if(callback) {
            FuriStdglueCallbackDict_set_at(
                furi_stdglue->global_outputs, (uint32_t)thread_id, callback);
        } else {
            FuriStdglueCallbackDict_erase(furi_stdglue->global_outputs, (uint32_t)thread_id);
        }
        furi_check(osMutexRelease(furi_stdglue->mutex) == osOK);
        return true;
    } else {
        return false;
    }
}

bool furi_stdglue_set_thread_stdout_callback(FuriStdglueWriteCallback callback) {
    assert(furi_stdglue);
    osThreadId_t thread_id = osThreadGetId();
    if(thread_id) {
        furi_check(osMutexAcquire(furi_stdglue->mutex, osWaitForever) == osOK);
        if(callback) {
            FuriStdglueCallbackDict_set_at(
                furi_stdglue->thread_outputs, (uint32_t)thread_id, callback);
        } else {
            FuriStdglueCallbackDict_erase(furi_stdglue->thread_outputs, (uint32_t)thread_id);
        }
        furi_check(osMutexRelease(furi_stdglue->mutex) == osOK);
        return true;
    } else {
        return false;
    }
}