The Vermont Views functions listed in Table 54.3 operate differently under UNIX and VMS than they do under PCDOS and OS/2. Their functionality is generally the same, although a different procedure may be followed to get similar results. They can generally be used without adversely affecting portability. For details on each function, see the Function Reference.
Table 54.3: Functions Differing
under PCDOS, OS/2, and the Terminal-based Versions
| Function | Difference |
| vv_abort() | Available in PCDOS and OS/2 but not installed as the default abort function. |
| beep_vv() | A variable beep is not supported under some operating systems. |
| catt_def() | Physical attributes are specified differently for each operating system. |
| csr_type() | Some cursor shapes are not supported on some terminals. |
| ki() | A different procedure is used to read the keyboard for each operating system. Multiple character sequences are handled under terminal-based systems. |
| ki_chk() | Because of the way multiple character sequences are handled, ki_chk() may return just the first character of a sequence. |
| ki_same() | Because of the differences in the speed of terminal input and the handling of multiple character sequences, ki_same() may not return all alike keycodes in one call. |
| latt_rpl() | Physical attributes are specified differently for each operating system. |
| mf_wr() | Under UNIX and POSIX, you can additionally open a pipe for output. |
| ms_wr() | Under UNIX and POSIX, you can additionally open a pipe for output. |
| se_abortfp() | Abort processing is slightly different under each operating system. |
| se_keyloop() | Under UNIX and POSIX, additional steps are taken to conserve system resources when possible. Also under UNIX and POSIX, installation of a keyloop function may not be possible under some circumstances. |
| time_delay() | Some operating systems do not handle delays in hundredths of a second. |
| v_bdr() | Because of differences in the support of borders, video output may differ. |
| v_box() | Because of differences in the support of borders, video output may differ |
| v_line() | Because of differences in the support of graphic lines, video output may differ. |
| vid_getmode() | The interpretation of the return values differs depending on the operating system. |
| vs_upd() | This function updates the screen in the terminal environment or in PCDOS only under Microsoft Windows. |
| vs_updrgn() | This function updates a region of the screen in the terminal environment or in PCDOS only under Microsoft Windows. |
| vv_exit() | Under UNIX, POSIX, and VMS, vv_exit() resets the terminal state. |
| vv_spawn() | The return value depends on the operating system. |
| wn_wr() | Under UNIX and POSIX, you can additionally open a pipe for output. |
