mbed-os/libraries/tests/mbed/file/main.cpp

#include "test_env.h"
#include "semihost_api.h"


Serial pc(USBTX, USBRX);

#define FILENAME      "/local/out.txt"
#define TEST_STRING   "Hello World!"

FILE* test_open(const char* mode) {
    FILE *f;
    f = fopen(FILENAME, mode);
    if (f == NULL) {
        printf("Error opening file"NL);
        notify_completion(false);
    }
    
    return f;
}

void test_write(FILE* f, char* str, int str_len) {
    int n = fprintf(f, str);
    if (n != str_len) {
        printf("Error writing file"NL);
        notify_completion(false);
    }
}

void test_read(FILE* f, char* str, int str_len) {
    int n = fread(str, sizeof(unsigned char), str_len, f);
    if (n != str_len) {
        printf("Error reading file"NL);
        notify_completion(false);
    }
}

void test_close(FILE* f) {
    int rc = fclose(f);
    if (rc != 0) {
        printf("Error closing file"NL);
        notify_completion(false);
    }
}

int main() {
    pc.printf("Test the Stream class\n");
    
    printf("connected: %s\n", (semihost_connected()) ? ("Yes") : ("No"));
    
    char mac[16];
    mbed_mac_address(mac); 
    printf("mac address: %02x,%02x,%02x,%02x,%02x,%02x\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); 
    
    LocalFileSystem local("local");
    
    FILE *f;
    char* str = TEST_STRING;
    char* buffer = (char*) malloc(sizeof(unsigned char)*strlen(TEST_STRING));
    int str_len = strlen(TEST_STRING);
    
    // Write
    f = test_open("w");
    test_write(f, str, str_len);
    test_close(f);
    
    // Read
    f = test_open("r");
    test_read(f, buffer, str_len);
    test_close(f);
    
    // Check the two strings are equal
    notify_completion((strncmp(buffer, str, str_len) == 0));
}