C/C++代码

/*
 * Helper function to read the content of a file into a buffer
 * avoids incompatible systemcalls
 */
static void *read_file(FILE *fp, size_t *o_filelen)
{
    size_t filelen = 0, len = 0;
    char *content = NULL;

#define STARTER_READ_CHUNKSIZE 64000
    while (!feof(fp))
    {
        if (!content)
        {
            len = 0;
            filelen = STARTER_READ_CHUNKSIZE;
            content = (char *) malloc(filelen + 1);
        }
        else
        {
            len = filelen;
            filelen += STARTER_READ_CHUNKSIZE;
            content = (char *) realloc(content, filelen + 1);
        }
        len = fread(&content[len], 1, STARTER_READ_CHUNKSIZE, fp);
    }
    filelen += len - STARTER_READ_CHUNKSIZE;
    if (filelen)
    {
        content = (char *) realloc(content, filelen + 1);
    }
    else
    {
        free(content);
        content = NULL;
    }

    if (content) content[filelen] = 0;
    *o_filelen = filelen;
    return (void *) content;
} /* read_file */