SkipSpacesNotReady

void skipspaces(FILE* f)
{
    if (!f) return;
    rewind(f);
    fpos_t start, end, mainstart;
    char s;
    int count;
    while (!feof(f))
    {
        count = 0;
        while ((s = fgetc(f)) && s != ' ' && !feof(f) && s != '\n');
        if (feof(f)) return;
        fgetpos(f, &mainstart);
        start = mainstart;
        while ((s = fgetc(f)) && s == ' ' && !feof(f)/* || s == '\n'*/) count++;
        if (feof(f)) return;
        fseek(f, -1, SEEK_CUR);
        fgetpos(f, &end);
        if (count > 0)
        {
            while (!feof(f))
            {
                fsetpos(f, &end);
                s = fgetc(f);
                if (s == EOF) break;
                fsetpos(f, &start);
                fputc(s, f);
                start++; end++;
            }
            fsetpos(f, &mainstart);
        }
    }
}