Rewrote test/blank.c to new API practice, inflated explanation comments
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test/blank.c
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test/blank.c
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/* -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 8; -*- */
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/** See this for the decisive API specs . libburn.h is The Original */
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#include <libburn/libburn.h>
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/* test/blank.c , API illustration of blanking a used CD-RW
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Copyright (C) ???? - 2006 Derek Foreman
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Copyright (C) 2006 - 2006 Thomas Schmitt
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This is provided under GPL only. Don't ask for anything else for now.
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Read. Try. Think. Play. Write yourself some code. Be free of our copyright.
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <assert.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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/* Some in-advance definitions to allow a more comprehensive ordering
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of the functions and their explanations in here */
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int burn_app_aquire_by_adr(char *drive_adr);
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int burn_app_aquire_by_driveno(int drive_no);
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/** This is a rough example. For simplicity it uses global variables.
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Drives are systemwide global, so we do not give away much of good style.
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*/
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/** This list will hold the drives known to libburn. This might be all CD
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drives of the system and thus might impose severe impact on the system.
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*/
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static struct burn_drive_info *drives;
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/** If you start a long lasting operation with n_drives > 1 then you are not
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friendly to the users of other drives on those systems. Beware. */
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static unsigned int n_drives;
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static void blank_disc(struct burn_drive *drive)
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/** You need to aquire a drive before burning. The API offers this as one
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compact call and alternatively as application controllable gestures of
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whitelisting, scanning for drives and finally grabbing one of them.
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If you have a persistent address of the drive, then the compact call is
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to prefer. See test/burniso.c for a more detailed explanation.
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*/
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int burn_app_aquire_drive(char *drive_adr, int driveno)
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{
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int ret;
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if(drive_adr != NULL && drive_adr[0] != 0)
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ret = burn_app_aquire_by_adr(drive_adr);
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else
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ret = burn_app_aquire_by_driveno(driveno);
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return ret;
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}
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/** If the persistent drive address is known, then this approach is much
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more un-obtrusive to the systemwide livestock of drives. Only the
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given drive device will be opened during this procedure.
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*/
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int burn_app_aquire_by_adr(char *drive_adr)
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{
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int ret;
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printf("Aquiring drive '%s' ...\n",drive_adr);
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ret = burn_drive_scan_and_grab(&drives,drive_adr,1);
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if (ret <= 0)
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printf("Failed\n");
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else
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printf("done\n");
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return ret;
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}
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/** This method demonstrates how to use libburn without knowing a persistent
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drive address in advance. It has to make sure that after assessing the
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list of available drives, all drives get closed again. Only then it is
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sysadmin-acceptable to aquire the desired drive for a prolonged time.
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This drive closing is enforced here by shutting down libburn and
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restarting it again with the much more un-obtrusive approach to use
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a persistent address and thus to only touch the one desired drive.
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*/
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int burn_app_aquire_by_driveno(int driveno)
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{
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char adr[BURN_DRIVE_ADR_LEN];
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int ret;
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printf("Scanning for devices ...\n");
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while (!burn_drive_scan(&drives, &n_drives)) ;
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if (n_drives <= 0) {
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printf("Failed (no drives found)\n");
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return 0;
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}
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printf("done\n");
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if (n_drives <= driveno) {
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fprintf(stderr,
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"Found only %d drives. Number %d not available.\n",
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n_drives,driveno);
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return 0;
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}
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/* Interactive programs may choose the drive number at this moment.
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drive[0] to drive[n_drives-1] are struct burn_drive_info
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as defined in libburn/libburn.h . This structure is part of API
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and thus will strive for future compatibility on source level.
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Have a look at the info offered. Have a look at test/devices.c .
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Caution: do not take .location for drive address. Always use
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burn_drive_get_adr() or you might become incompatible
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in future.
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Note: bugs with struct burn_drive_info - if any - will not be
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easy to fix. Please report them but also strive for
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workarounds on application level.
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*/
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/* Now save yourself from sysadmins' revenge */
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/* If n_drives == 1 this would be not really necessary, though.
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You could now call burn_drive_grab() and avoid libburn restart.
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We don't try to be smart here and follow the API's strong urge. */
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if (burn_drive_get_adr(&(drives[driveno]), adr) <=0) {
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fprintf(stderr,
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"Cannot inquire persistent drive address of drive number %d\n",
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driveno);
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return 0;
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}
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printf("Detected '%s' as persistent address of drive number %d\n",
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adr,driveno);
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/* In cdrskin this causes a delayed sigsegv. I understand we risk only
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a small memory leak by not doing:
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burn_drive_info_free(drives);
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*/
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burn_finish();
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printf(
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"Re-Initializing library to release any unintended drives ...\n");
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if (burn_initialize())
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printf("done\n");
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else {
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printf("Failed\n");
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fprintf(stderr,"\nFailed to re-initialize libburn.\n");
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return 0;
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}
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ret = burn_app_aquire_by_adr(adr);
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return ret;
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}
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/** Makes a previously used CD-RW ready for thorough re-usal.
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To our knowledge it is hardly possible to abort an ongoing blank operation
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because after start it is entirely handled by the drive.
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So expect a blank run to survive the end of the blanking process and be
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patient for the usual timespan of a normal blank run. Only after that
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time has surely elapsed, only then you should start any rescue attempts
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with the drive. If necessary at all.
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*/
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static void blank_disc(struct burn_drive *drive, int blank_fast)
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{
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enum burn_disc_status s;
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struct burn_progress p;
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int do_blank = 0;
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#ifdef Blank_late_grab_obsoletion_revoke_and_faiL
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/* This is obsoleted now by the burn_app_aquire* functions.
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There is no real benefit in grabbing late.
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Beneficial is to scan only one drive.
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*/
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if (!burn_drive_grab(drive, 1)) {
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fprintf(stderr, "Unable to open the drive!\n");
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return;
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}
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#endif /* Blank_late_grab_obsoletion_revoke_and_faiL */
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while (burn_drive_get_status(drive, NULL)) {
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while (burn_drive_get_status(drive, NULL))
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usleep(1000);
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}
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while ((s = burn_disc_get_status(drive)) == BURN_DISC_UNREADY)
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usleep(1000);
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printf("%d\n", s);
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if (s != BURN_DISC_FULL) {
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printf(
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"Drive media status: %d (see libburn/libburn.h BURN_DISC_*)\n", s);
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do_blank = 0;
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if (s == BURN_DISC_BLANK) {
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fprintf(stderr,
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"IDLE: Blank CD media detected. Will leave it untouched\n");
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} else if (s == BURN_DISC_FULL || s == BURN_DISC_APPENDABLE) {
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do_blank = 1;
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} else if (s == BURN_DISC_EMPTY) {
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fprintf(stderr,"FATAL: No media detected in drive\n");
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} else {
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fprintf(stderr,
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"FATAL: Cannot recognize drive and media state\n");
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}
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if(do_blank && !burn_disc_erasable(drive)) {
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fprintf(stderr,
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"FATAL : Media is not of erasable type\n");
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do_blank = 0;
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}
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if (!do_blank) {
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burn_drive_release(drive, 0);
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fprintf(stderr, "No disc found!\n");
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return;
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}
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fprintf(stderr, "Blanking disc...");
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burn_disc_erase(drive, 1);
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printf(
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"Beginning to %s-blank CD media. Will display sector numbers.\n",
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(blank_fast?"fast":"full"));
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burn_disc_erase(drive, blank_fast);
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while (burn_drive_get_status(drive, &p)) {
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printf("%d\n", p.sector);
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sleep(2);
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}
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fprintf(stderr, "Done\n");
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printf("Done\n");
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burn_drive_release(drive, 0);
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}
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void parse_args(int argc, char **argv, int *drive)
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void parse_args(int argc, char **argv, char **drive_adr, int *driveno,
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int *blank_fast)
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{
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int i;
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int help = 0;
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static char no_drive_adr[]= {""};
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*drive_adr = no_drive_adr;
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for (i = 1; i < argc; ++i) {
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if (!strcmp(argv[i], "--drive")) {
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if (!strcmp(argv[i], "--blank_fast")) {
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*blank_fast= 1;
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} else if (!strcmp(argv[i], "--blank_full")) {
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*blank_fast= 0;
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} else if (!strcmp(argv[i], "--drive")) {
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++i;
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if (i >= argc)
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if (i >= argc) {
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printf("--drive requires an argument\n");
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else
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*drive = atoi(argv[i]);
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exit(3);
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} else if (isdigit(argv[i][0])) {
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*drive_adr = no_drive_adr;
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*driveno = atoi(argv[i]);
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} else
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*drive_adr = argv[i];
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} else if (!strcmp(argv[i], "--verbose")) {
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++i;
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if (i >= argc)
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@ -69,31 +257,37 @@ void parse_args(int argc, char **argv, int *drive)
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}
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}
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if (help) {
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printf("Usage: %s [--drive <num>] [--verbose <level>]\n",
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argv[0]);
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exit(EXIT_FAILURE);
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printf("Usage: %s\n", argv[0]);
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printf(" [--blank_fast|--blank_full] [--drive <address>|<num>]\n");
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printf(" [--verbose <level>]\n");
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exit(3);
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}
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}
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int main(int argc, char **argv)
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{
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int drive = 0;
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int driveno = 0, blank_fast= 1;
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char *drive_adr= NULL;
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parse_args(argc, argv, &drive);
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fprintf(stderr, "Initializing library...");
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parse_args(argc, argv, &drive_adr, &driveno, &blank_fast);
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printf("Initializing library ...\n");
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if (burn_initialize())
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fprintf(stderr, "Success\n");
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printf("done\n");
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else {
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printf("Failed\n");
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fprintf(stderr,"\nFATAL: Failed to initialize libburn.\n");
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return 1;
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}
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fprintf(stderr, "Scanning for devices...");
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while (!burn_drive_scan(&drives, &n_drives)) ;
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fprintf(stderr, "Done\n");
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if (burn_app_aquire_drive(drive_adr,driveno)<=0) {
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fprintf(stderr,"\nFATAL: Failed to aquire drive.\n");
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return 2;
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}
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blank_disc(drives[driveno].drive, blank_fast);
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blank_disc(drives[drive].drive);
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burn_drive_info_free(drives);
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burn_finish();
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return 0;
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