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Text File | 1991-11-18 | 11.9 KB | 237 lines

; LD.COM Size (recs) CRC Version Author/Latest Issue Disk 4k (32) D55E 1.1 Gene Pizzetta 10/91 Z3COM11 1- Syntax/Options 2- Displays 3- Security 4- Errs 5- Config 6- Notes LD is a ZCPR3 library directory utility that shows member files along with their create and modify dates and times, sizes, compression method, uncompressed filenames, CRC's, and indexes. Embedded comments up to 76 char- acters can be displayed. Output can be directed to the printer. Message register output and wheel protection are included. It will also run under vanilla CP/M 2.2 and CP/M Plus, but only the current user is accessible and, of course, the ZCPR3 features will not work. Vs 1.0 (10/07/91) by Gene Pizzetta. :1 Syntax LD {dir:}lbrname {afn} {{/}options} If no DIR or DU specification is given, the current drive and user are assumed. If an ambiguous file specification is given following the library name, only member files matching it will be shown. Otherwise, all member files will be shown. A member filename beginning with a slash can be matched by preceding the filename with a colon. Options - 1/4 A leading slash is required only if the member filespec is missing, but it is allowed in any case. C Show embedded comments. Some crunched files have a text comment embedded in their headers. This option will display them in highlighted video on the line following the member listing. This option is ignored if the X option (alternate display) is used. D Prefer embedded date stamps. Ordinarily, LD checks the library directory for a date stamp and, if one is not found there, it looks for an embedded stamp in the headers of crunched files. The first stamp found is displayed. With this option, LD will first check for an embedded date stamp and use the library directory stamp only if an embedded stamp is not found or if the member file is not crunched. Options - 2/4 X Alternate display. Two member files are shown per line with their CRC's and indexes. Compression method, date stamps, and uncompressed member names are suppressed. Embedded comments cannot be displayed. Since no member file headers are read, LD works faster than with the default display. S Summary only. Only the final summary line is displayed giving statistics for the library as a whole. Since individual member files are not accessed, the summary is displayed very quickly. P Don't page screen. Normally, LD waits for a key to be pressed each time the screen fills. With this option scrolling is continuous. The screen can still be paused with ^S. Options - 3/4 Q Quiet mode. Only error messages are displayed on the console. This option is very useful when LD is being used only to load the message registers (option M). It also allows sending the display to the printer without echoing it to the screen. M Store results to memory. The number of matching member files and the number of free (unused) library directory entries are stored in two two-byte words (low byte first) in four consecutive message registers. As distributed, registers 18 through 21 are used. LD's operation can be greatly speeded up if the S option is used with M. L Echo to printer (LST:). Printer output is not allowed if the wheel byte is off. Screen paging is turned off automatically. Options - 4/4 F Send a final form feed to the printer. Only effective if the L option is active, a form feed will be sent to the printer after the library directory is printed. All options can be configured as defaults (see CONFIGURATION). In that case, the command line option will toggle to the non-default mode. :2 Displays - 1/3 The top line gives the drive, user, and name of the library file, with attribute characters in lower-case and highlighted. The date and time the library was created and last modified will also be shown, if they are avail- able in the library directory. There are two types of display screens. Both displays show the names of matching member files and their sizes in records (sectors) and in kilobytes, including fractional parts of a kilobyte (.00, .12, .25, .37, .50, .62, .75, or .87, indicating 0 to 7 additional records). Displays - 2/3 The DEFAULT DISPLAY, which shows only one member file per line, includes the method by which the file was compressed as "CR" for GEL (LZW) crunched, "LZH" for LZH crunched, and "SQ" for squeezed. Dashes means either the file is not compressed or it is compressed by an unrecognized method. The default display also shows, if possible, the date and time each member file was created and last modified. If no date and time are found in the library directory, crunched files are checked for embedded datestamps. If found, they are displayed instead, with a "~" between the date and time to indicate their source. Finally, the default display gives the real name of crunched and squeezed files--the name the file will have when it is uncompressed. If the C command line option is given with the default display and if a crunched file contains an embedded comment, the comment will be displayed on a separate line just below the entry for that member, up to 76 characters with video highlighting, usually surrounded with brackets. If the comment has to be truncated because it is too long, there will be no closing bracket. (It should be noted, however, that occasionally an embedded comment may not be terminated in the file header with a closing bracket.) Displays - 3/3 The ALTERNATE DISPLAY, which shows two member files per line, includes each file's cyclic redundancy checksum (CRC) and its index (position offset) within the library. Embedded comments cannot be shown with the alternate display; however, more member files fit on the screen and it works faster because individual member files are not accessed. With both displays a final summary line gives the number of matching member files found, the number of active members in the library, the number of deleted members, the number of free directory entries, and the total directory entries. LD can be aborted anytime with ^K, K, ^X, X, ^C, or C. Except at the "[more]" prompt, a ^S will pause the display until another key is pressed. Pressing the space bar at any time sets LD to "line by line" advance (unless paging has been turned off with the P option). :3 Security Complete security is assured under ZCPR3 by using the filespec as parsed by the command processor. As additional security, LBR files with the system attribute set will be ignored if the wheel byte is off. For non-wheels, the summary line shows only the number of matching members and the number of active member files. Non-wheels cannot access the command line options "L" and "F" for printer output, nor are these options shown on the usage screen if the wheel byte is off. If the options are used on the command line, no error message is given, but the printer is not accessed. The "M" option for message register output and the "Q" quiet mode option are not listed on the usage screen if the wheel byte is off, but they can still be used. :4 Errors On error the ZCPR3 program error flag is set as follows: 255 no matching member files found 19 invalid option 12 insufficient memory (TPA overflow) 10 library file not found 4 library is corrupt, or no message buffer with M option 2 invalid directory The error handler, if one is running, will be invoked for all errors, except when no matching member files are found (code 255). :5 Configuration - 1/2 Although a large number o configuration options are available, LD should be ready to use "as is" for remote access systems (RAS) or individuals under ZCPR3. CP/M users should change the configured number of screen lines if their screen has more or less than 24 lines. Sysops for non-ZCPR3 remote systems should also install the address of their system's wheel byte. Configuration changes are made with ZCNFG and the accompanying LDnn.CFG file. If the name of the configuration file is not changed, ZCNFG will always be able to find it, even if the name of LD is changed to something else, such as LDIR. Full explanations for the various options are available on the configuration help screens. All command line options are toggles and can be configured as the defaults. The command line options may then be used to toggle to whatever is the non- default state. Configuration - 2/2 The date displays can be configured for either "American" (mm/dd/yy) or "European" (dd.mm.yy) format. The time displays can be configured for either "Civilian" (12-hour time, e.g., "3:21p") or "Military" (24-hour time, e.g., "15:21") format. As distributed, American date and military time are used. With the "M" option the number of matching member files is placed in registers 18 and 19 (low byte first), the number of free (unused) library directory entries in registers 20 and 21. The registers used may also be changed. :6 LD Notes - 1/2 a. LD is derived from LDIR-B Version 2.2, which gives an UNARC-type display of library directories. Originally written by Steven Greenberg, it is the result of several years of continuing development by Bruce Morgen, Michal Carson, Sean Sullivan, Howard Goldstein, and Gene Pizzetta. LD will be moving in a slightly different direction, hence, the name change. The goal is to keep this program under 4K, about twice the size of LDIR-B, and to provide a more versatile library directory tool with numerous command line and configuration options, and making more extens- ive use of Z-System facilities, while remaining compatible with vanilla CP/M. b. Vs 1.1 updates (10/25/91, Gene Pizzetta): - Added alternate display of member names, sizes, CRC's, and indexes in two-columns. - Changed some options, added others. Option S prints only the summary line. Option Q is a true quiet mode. Option M stores the number of matching members and free library directory entries to message regis- ters. Option D checks for embedded dates in crunched files before checking library directory for dates. LD Notes - 2/2 - Restored configurable wheel byte address for non-ZCPR3 systems. If wheel is off, now shows number of matching and active members and suppresses display of M and Q (along with L and F) options on usage screen, although M and Q will still work. - In quiet mode output can be sent to the printer. - Top of memory calculation is now less conservative for low memory applications. - Fixed a few bugs, including one that kept LD from running under vanilla CP/M. - Now invokes error handler for errors other than no matching member files found.