Function new_file_descriptor

libraries/AP_Filesystem/AP_Filesystem_FATFS.cpp:61–100

allocate a file descriptor */

  allocate a file descriptor
*/
static int new_file_descriptor(const char *pathname)
{
    int i;
    FAT_FILE *stream;
    FIL *fh;

    for (i=0; i<MAX_FILES; ++i) {
        if (isatty_(i)) {
            continue;
        }
        if (file_table[i] == NULL) {
            stream = (FAT_FILE *) calloc(sizeof(FAT_FILE),1);
            if (stream == NULL) {
                errno = ENOMEM;
                return -1;
            }
            fh = (FIL *) calloc(sizeof(FIL),1);
            if (fh == NULL) {
                free(stream);
                errno = ENOMEM;
                return -1;
            }
            char *fname = (char *)malloc(strlen(pathname)+1);
            if (fname == NULL) {
                free(fh);
                free(stream);
                errno = ENOMEM;
                return -1;
            }
            strcpy(fname, pathname);
            stream->name = fname;

            file_table[i]  = stream;
            stream->fh = fh;
            return i;
        }
    }
    errno = ENFILE;
    return -1;
}

static FAT_FILE *fileno_to_stream(int fileno)
{