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README.md in Portuguese (Portugal)
[MS-DOS.git] / v2.0 / source / FIND.ASM
1 title MSDOS V2.0 FIND
2
3 ;--------------------------------------------------------------------;
4 ; Revision History: ;
5 ; ;
6 ; V1.1 8/23/82 M.A.Ulloa ;
7 ; ;
8 ; V1.2 9/22/82 M.A.Ulloa ;
9 ; Added the -c and -n options ;
10 ; ;
11 ; 9/23/82 M.A.Ulloa ;
12 ; Added DOS version number control ;
13 ; ;
14 ; 10/07/82 Rev.2 M.A.Ulloa ;
15 ; Changed quote for double quotes, and added ;
16 ; file name printing ;
17 ; ;
18 ; 10/20/82 Rev.3 M.A.Ulloa ;
19 ; Modified IBM name to FIND, and changed the text ;
20 ; of some messages. ;
21 ; ;
22 ; 10/25/82 Rev.4 M.A.Ulloa ;
23 ; Changed name to FIND and all messages to the ;
24 ; IBM form. ;
25 ; ;
26 ; 10/27/82 Rev.5 M.A.Ulloa ;
27 ; Made the correct exit on version check in case ;
28 ; of a 1.x DOS. ;
29 ; ;
30 ; 11/4/82 Rev. 5 A.R. Reynolds ;
31 ; Messages moved to external module ;
32 ; ;
33 ; 11/10/82 Rev. 6 M.A. Ulloa ;
34 ; Corrected problem with line numbers, and a problem ;
35 ; with seeking for 0 chars. ;
36 ; ;
37 ; 03/30/83 Rev. 7 M.A. Ulloa ;
38 ; Added patch area for bug fixing. ;
39 ; ;
40 ; 04/14/83 Rev. 8 M.A. Ulloa ;
41 ; Made changes for Kanji characters. (uhg!) ;
42 ; ;
43 ;--------------------------------------------------------------------;
44
45 FALSE equ 0
46 TRUE equ NOT FALSE
47
48 KANJI equ FALSE ;set to true is kanji vers.
49
50 ;--------------------------------------------------------------------;
51 ; FIND program following the standart UNIX operation. ;
52 ; ;
53 ; FORMAT: ;
54 ; find {option} string {filename {filename} {...}} ;
55 ; ;
56 ; NOTES: ;
57 ; 1) String arguments HAVE to be enclosed ;
58 ; in double quotes. (Two double quotes if a ;
59 ; doble quote is to be included). Only ONE ;
60 ; string argument is presently allowed. ;
61 ; ;
62 ; 2) Options are available: ;
63 ; v All lines but those matching are considered ;
64 ; c Only print a count of matching lines ;
65 ; n Each line is preceded by its relative ;
66 ; line number in the file. ;
67 ; ;
68 ; - Options can be Upper or lower case. ;
69 ; - Format: The switch character followed by an options ;
70 ; character. I.e.: In the IBM PC: /v ;
71 ; ;
72 ; 3) The program returns: ;
73 ; 0 - OK, and some matches ;
74 ; 2 - Some Error ;
75 ; ;
76 ; 4) The maximum line size is determined by ;
77 ; buffer size. Bigger lines will bomb the program. ;
78 ; ;
79 ; 5) If no file name is given then it will asssume ;
80 ; the input is comming from the Standart Input. NO ;
81 ; errors are reported when reading from Standart Input. ;
82 ;--------------------------------------------------------------------;
83
84 code segment public
85 assume cs:code,ss:code,ds:nothing,es:nothing
86
87
88 CR equ 0dh ;A Carriage Return
89 LF equ 0ah ;A Line Feed
90 quote_char equ 22h ;A double quote character
91
92
93 buffer_size equ 4096 ;file buffer size
94 st_buf_size equ 128 ;string arg. buffer size
95 fname_buf_size equ 64 ;file name buffer size
96
97
98 ;----- DOS EQUATES --------------------------------------------------;
99 std_in equ 0 ;STD input handle
100 std_out equ 1 ;STD output handle
101 std_err equ 2 ;STD error handle
102 dos_ent equ 21h ;DOS entry point
103
104 std_con_string_output equ 9
105 get_version equ 48
106 char_oper equ 55 ;get configuration parameters
107 open equ 61 ;DOS std open code
108 close equ 62 ;DOS std close code
109 read equ 63 ;DOS std read code
110 write equ 64 ;DOS std write code
111 lseek equ 66 ;DOS file seek
112 exit equ 76 ;DOS process exit code
113
114
115 ;----- Misc Data -----------------------------------------------;
116 make db "***MAUlloa/Microsoft/V12***"
117 rev db "8"
118
119
120 colon db ": "
121 n1_buf db "["
122 n2_buf db 8 dup(0) ;buffer for number conversion
123
124
125
126 ;----- OPTION FLAGS -------------------------------------------------;
127 ; If a flag is set (0ffh) then the option has been selected, if
128 ;reset (0) then it has been not. All options are reset initially.
129 ; NOTE: the order of this table has to remain consistent with the
130 ;options dispatch code. If any changes are made they have to
131 ;correspond with the code.
132
133 opt_tbl:
134
135 v_flg db 0
136 c_flg db 0
137 n_flg db 0
138 x_flg db 0 ;not used
139 l_flg db 0 ;not used
140
141
142 ;----- LINE COUNTERS ------------------------------------------------;
143 mtch_cntr dw 0 ;matched lines counter
144 line_cntr dw 0 ;line counter
145
146
147 ;----- MAIN ROUTINE -------------------------------------------------;
148 start:
149
150 ;----- CHECK VERSION NUMBER -----------------------------------------;
151
152 mov ah,get_version
153 int 21h
154 cmp al,2
155 jge vers_ok
156 push cs
157 pop ds
158 mov dx,offset bad_vers
159 mov ah,std_con_string_output
160 int 21h
161 push es ;bad vers, exit a la 1.x
162 xor ax,ax
163 push ax
164
165 badfart proc far ;(what a hack!!)
166 ret
167 badfart endp
168
169 vers_ok:
170
171 push cs ;load ES to the right area,
172 pop es ; for use with DI register
173
174 assume es:code
175
176 ;--------------------------------------------------------------------;
177
178 mov si,81h ;Start addrss. of commad line buf.
179
180 call kill_bl ;Get rid of blanks
181 or bx,bx ;A CR found?
182 jz find_opt ;no, first find the options
183 args_missing:
184 mov dx,offset errmsg1 ;empty command line, no args: error.
185 mov cl,cs:errlen1
186 call prt_err
187 mov al,2 ;error code for exit
188 jmp done
189
190
191 ;----- FIND THE OPTION IF ANY ---------------------------------------;
192 find_opt:
193 mov ah,char_oper ;get the dos switch char.
194 mov al,0
195 int dos_ent ;switch char in DL
196 push dx
197 another_opt:
198 lodsb ;get the first char of command line
199 cmp al,' ' ;a blank?
200 je cont_scan
201 cmp al,CR ;a Carriage Return
202 je args_missing
203 pop dx ;get switch character
204 cmp al,dl ;is it the switch char?
205 jne find_str ;no, no options: get the string
206 push dx ;save for another round
207
208 lodsb ;get the option character
209 cmp al,' ' ;a blank?
210 je cont_scan ;yes, ignore and continue
211 cmp al,CR ;a CR?
212 je args_missing ;yes, error...
213 call make_caps ;Capitalize the character
214 mov bx,offset opt_tbl ;pointer to option flag table
215
216 cmp al,'V' ;the v option?
217 je opt_v
218 cmp al,'C' ;the c option?
219 je opt_c
220 cmp al,'N' ;the n option?
221 je opt_n
222
223 mov cs:errmsg5_opt,al ;save the option
224 mov dx,offset errmsg5 ;unknown option: error
225 mov cl,cs:errlen5
226 call prt_err
227 mov dx,offset crlf ;print a CRLF
228 mov cx,2
229 call prt_err
230 jmp another_opt ;process next option
231
232 opt_v:
233 mov di,0
234 jmp short opt_dispatch
235
236 opt_c:
237 mov di,1
238 jmp short opt_dispatch
239
240 opt_n:
241 mov di,2
242
243 opt_dispatch:
244 mov es:byte ptr[bx+di],0ffh ;set the corresponding flag
245 jmp another_opt ;process the rest of the options
246
247 cont_scan:
248 dec si ;adjust SI
249 call kill_bl ;get rid of blanks
250 or bx,bx ;A CR found?
251 jz another_opt ;no, test for other options
252 jmp args_missing ;yes, error...
253
254
255 ;----- FIND STRING ARGUMENT -----------------------------------------;
256 find_str:
257 cmp al,quote_char ;string should start with a
258 jnz bad_str_err ; quote character, if not: error.
259 mov di,offset st_buffer ;String argument buffer addrss.
260 xor cx,cx ;Clear to keep string length.
261
262 move_str:
263 lodsb
264 cmp al,CR ;if a CR is found in the string
265 jnz str_ok ; then it's a bad string
266 bad_str_err:
267 mov dx,offset errmsg2 ;bad string error message
268 mov cl,cs:errlen2
269 call prt_err ;print the error.
270 mov al,2
271 jmp done
272
273 str_ok:
274 cmp al,quote_char ;look for a quote character
275 jnz move_char ;not an apost., move to buffer
276 lodsb ;an apost., check next char.
277 cmp al,quote_char ;another quote character?
278 je move_char ;yes, move it to the buffer
279 dec si ;no, adjust the pointer
280 mov es:st_length,cx ;store the string length
281 or cx,cx ;Is the string empty?
282 jnz other_args ;no: get the rest of the args.
283 mov al,1 ;empty: no matches(!?)
284 jmp done
285 move_char:
286 stosb ;put in buffer
287 inc cx ;increment string length
288 jmp move_str
289
290
291 ;----- FIND THE FILE ARGUMENTS --------------------------------------;
292 other_args: ;Process the rest of the command
293 ; line arguments.
294 call kill_bl ;get rid of leading blanks
295 or bx,bx ;At least one argument necessary,
296 jz further_args ; if a CR not found: ok.
297
298 ;----- USE STD IN FOR INPUT -----------------------------------------;
299 push cs
300 pop ds
301 mov ax,std_in ;handle
302 jmp fill
303
304 further_args:
305 call clr_cntrs ;set all counters to zero
306 mov di,offset file_name_buf ;Set pointer to the name buffer
307 xor cx,cx ;zero file name length
308 move_fname:
309 lodsb
310 cmp al,' ' ;A blank: end of file name,
311 je done_move
312 cmp al,CR ;A CR: idem.
313 je done_move
314 stosb ;store in name buffer
315 inc cx ;increment file name length
316 jmp move_fname
317 done_move:
318 dec si ;Adjust pointer for next round.
319 mov es:byte ptr[di],00h ;File names are null terminated
320 push si ;Save SI to continue com. line scan.
321 push ds ;Save DS register contents for
322 ; later because it points to the
323 ; rest of the arguments.
324 mov es:file_name_len,cx ;save the name length
325
326 ;----- OPEN FILE FOR READING ----------------------------------------;
327 push cs ;Load new DS with CS
328 pop ds
329 mov dx,offset file_name_buf ;addrss. of the file name
330 mov ah,open
331 mov al,0 ;file open for reading
332 int dos_ent ;call the DOS
333 jnc say_name ;if no carry then no errors
334 jmp open_error
335
336 ;----- PRINT FILE NAME ----------------------------------------------;
337 say_name:
338 push ax ;save file handle
339 mov dx,offset heading
340 mov cl,cs:heading_len
341 xor ch,ch
342 call prout
343
344 mov dx,offset file_name_buf
345 mov cx,ds:file_name_len
346 call prout
347
348 cmp ds:c_flg,0ffh ;count only flag set?
349 je xx1
350
351 mov dx,offset crlf
352 mov cx,2
353 call prout
354
355 xx1:
356 pop ax
357
358 ;----- Fill Buffer for Matching -------------------------------------;
359 fill:
360 mov bx,ax ;retrieve handle
361 refill:
362 mov dx,offset buffer ;data buffer addrss.
363 mov cx,buffer_size
364 mov ah,read
365 int dos_ent
366 jnc no_read_error ;if carry then read error
367 jmp read_error
368 no_read_error:
369 or ax,ax ;if ax=0 then all done
370 jnz go_match
371 cmp ds:c_flg,0ffh ;count only flag set?
372 jne sj2
373 call print_count
374 sj2:
375 cmp bx,std_in ;Using STD IN?
376 jnz regular
377 jmp foo ;if so: all done, exit
378 regular:
379 mov ah,close ;otherwise close the file
380 int dos_ent
381 jmp scan_rest ;get another file
382
383 ;----- MATCH ROUTINE ------------------------------------------------;
384 ;Note: If input is being taken from a file the stack contains
385 ; (from top to bottom):
386 ; - Pointer to the next command in the command line
387 ; - Pointer to the program segment prefix (to be loaded into
388 ; DS to access the command line.
389 ; if the imput is from the standart input then NONE of it will be
390 ; in the stack.
391
392 go_match:
393 push bx ;save the file handle
394 mov bp,offset buffer ;ptr to first line of file
395 mov di,ax ;dispalcement from beg of buffer
396
397 cmp ax,buffer_size-1 ;last line of the file?
398 jg no_last_line ;if yes, add a CRLF just in case
399 mov bx,bp
400 cmp byte ptr[bx+di-1],LF ;finished with a LF?
401 je no_last_line ;yes, it's an OK line.
402 mov byte ptr[bx+di],CR ;put a CR at the end of the data
403 inc di
404 mov byte ptr[bx+di],LF ;put a LF ...
405 inc di
406
407 no_last_line:
408 push di ;save the # of chars. in the buffer
409 push bp
410 mov dx,ds:st_length ;length of the string arg.
411 dec dx ;adjust for later use
412 jmp short try_again
413
414
415 more_stuff_o:
416 jmp more_stuff
417
418
419
420 ;----- SCAN LINES IN THE BUFFER FOR A MATCH -------------------------;
421 ;Note: at this point the stack contains (from top to bottom):
422 ; - Stuff mentioned before
423 ; - File Handle
424 ; - Number of chars. left in the buffer from the next line.
425 ; - Addrs. of the next line in the buffer.
426 ;
427 ; plus, DX has the adjusted length of the string argument.
428
429 try_again:
430 inc ds:line_cntr ;increment line counter
431 pop bp ;addrs. of next line in the buffer
432 mov di,bp ;points to beg. of a line
433 pop cx ;get # of chars left in the buffer
434 mov bx,cx ;save in case a non-complete line
435 mov al,LF ;search for a Line Feed
436 jcxz more_stuff_o ;no chars left in buffer
437 repnz scasb
438 jnz more_stuff_o ;no full line left in buffer
439
440 push cx ;save chars left in buffer
441 push di ;points to beg. of next line
442 mov cx,di
443 sub cx,bp ;length of the current line
444 mov bx,cx ;save in case it has a match
445 dec cx
446 dec cx ;CRLF characters discounted
447 jcxz try_again_opt ;if line empty go to next line
448 mov di,bp ;pointer to the beg. of current line
449 another_char:
450 ;
451 ; On entry:
452 ; BX line length
453 ; CX adjusted line length
454 ; DX adjusted string argument length
455 ; DI points to beg. of line
456 ;
457
458 IF KANJI
459
460 push dx ;save for next line
461 lop:
462 pop dx
463 push dx
464 inc dx ;different algorithm!
465 mov si,offset st_buffer ;pointer to beg. of string argument
466
467 comp_next_char:
468 push di
469 mov di,si
470 call is_prefix ;check for a prefix char
471 pop di
472 jnc nopre
473 lodsw
474 cmp cx,1 ; Can not compare a two byte char
475 jz try_again_opt1 ; if there is only one available
476 cmp ax,word ptr [di]
477 jz kmatch1
478 call next_kchar ;no match, advance di to next kanji
479 jc try_again_opt1 ;not enough chars left in line
480 jmp short lop ;try another char in line
481
482 nopre:
483 lodsb
484 cmp al,byte ptr [di]
485 jz kmatch
486 call next_kchar ;no match, advance di to next kanji
487 jc try_again_opt1 ;not enough chars left in line
488 jmp short lop ;try another char in line
489
490 try_again_opt1:
491 pop dx
492 jmp try_again_opt
493
494
495 kmatch1:
496 dec dx ;last char had prefix so it was
497 ; long.
498 kmatch:
499 dec dx
500 jz a_matchk ; no chars left: a match!
501 call next_kchar
502 jc try_again_opt1
503 jmp comp_next_char ; loop if chars left in arg.
504
505 a_matchk:
506 pop dx
507
508 ELSE
509
510 mov si,offset st_buffer ;pointer to beg. of string argument
511 lodsb ;get first character of the str. arg.
512 repnz scasb ;search for a match in current line
513 jnz try_again_opt ;no match, try the next line
514 cmp cx,dx ;compare lengths, a full match is not
515 jb try_again_opt ; possible if CX < DX.
516 push di ;save addrs. of next char. in the line
517 push cx ;save the # of chars. left in the line
518 mov cx,dx ;get the adjusted string arg. length
519 jcxz a_match ;if a single char string, then match!
520 repz cmpsb ;compare string with line
521 jz a_match ;a match found, hurrah!
522 pop cx ;no match, get # of chars remaining
523 ; in the line.
524 pop di ;position of the next char. in the line
525 jmp another_char
526
527
528 ;----- A MATCH: CHECK FOR THE v OPTION ------------------------------;
529 a_match:
530 pop ax ;adjust stack
531 pop ax
532 ENDIF
533
534 cmp ds:v_flg,0ffh ;is flag set?
535 jne prt_line ;no, print the line
536 jmp try_again
537
538 ;----- NO MATCH: CHECK FOR THE v OPTION -----------------------------;
539 try_again_opt:
540 cmp ds:v_flg,0ffh ;is flag set?
541 jne try_again ;no goto next line
542
543 ;----- PRINT THE LINE WITH THE MATCH --------------------------------;
544 ;Note: at this point the stack contains (top to bottom)
545 ; - Stuff mentioned before
546 ;
547 ; plus, BP points to begginig of the current line, BX has the length
548 ;of the current line including the CRLF, and DX the adjusted length of
549 ;the string argument.
550
551 prt_line:
552 cmp ds:c_flg,0ffh ;is count only flag set?
553 jne no_c_flg
554 inc ds:mtch_cntr ;yes, increment counter
555 jmp try_again
556
557 no_c_flg:
558 push dx ;save the adjusted string arg. length
559 cmp ds:n_flg,0ffh ;is line number flag set?
560 jne no_n_flg
561 call prt_lcntr
562 no_n_flg:
563 mov dx,bp
564 mov cx,bx
565 call prout
566 pop dx ;restore
567 jmp try_again
568
569 ;----- READ MORE TEXT LINES INTO THE BUFFER -------------------------;
570 ; The scanning routines have detected that the buffer does not
571 ;contain a full line any more. More lines have to be read into the
572 ;buffer. But first perform a seek on the file in order to re-read
573 ;the non-complete line into the begining of the buffer.
574 ; Uppon entry BP contains points to the begining of the non-complete
575 ;line, and BX has the number of characters left in the buffer.
576 ; The Stack contains (top to bottom):
577 ; - Pointer to the next command in the command line
578 ; - Pointer to the program segment prefix (to be loaded into
579 ; DS to access the command line).
580 ; - File handle.
581
582 more_stuff:
583 mov dx,bx ;get chars left in buffer
584 pop bx ;get the handle
585 or dx,dx ;are there 0 left?
586 jz no_seek ;yes, do not seek
587 neg dx ;form two's complement
588 mov cx,-1
589 mov al,1 ;seek from the current position
590 mov ah,lseek ;seek on file
591 int dos_ent
592 jc read_error
593 no_seek:
594 jmp refill ;no errors: refill the buffer
595 read_error:
596 cmp bx,std_in ;Using STD IN?
597 je foo ;if so: all done, exit
598 mov ah,close ;close the file
599 int dos_ent
600 mov dx,offset errmsg4_pre ;read error
601 mov cl,cs:errlen4_pre
602 call prt_file_name ;print the file name in error
603 mov dx,offset errmsg4_post ;read error
604 mov cl,cs:errlen4_post
605 jmp r_error
606
607 ;----- PRINT ERRORS -------------------------------------------------;
608 open_error:
609 mov dx,offset errmsg3_pre ;error in open operation
610 mov cl,cs:errlen3_pre
611 call prt_err_2 ;print error message
612 call prt_file_name ;print the file name in error
613 mov dx,offset errmsg3_post ;error in open operation
614 mov cl,cs:errlen3_post
615 r_error:
616 call prt_err_2 ;print error message
617
618 ;----- SCAN THE REST OF THE COMMAND LINE ----------------------------;
619 scan_rest:
620 pop ds ;restore pointer to comm. line
621 pop si ;restore pointer to next comm.
622 call kill_bl ;look for further args.
623 or bx,bx ;test for a CR
624 jnz foo
625 jmp further_args
626 foo:
627 mov al,0 ;Proper code
628 done:
629 mov ah,exit ;All done, exit with proper code.
630 int dos_ent
631
632
633 ;--------------------------------------------------------------------;
634 ; Get rid of blanks in command line. ;
635 ; Advances the SI reg till the next non-blank character, if the ;
636 ; character is a CR (0dh) then returns with BX non-zero, otherwise ;
637 ; BX is zero. ;
638 ; ;
639 ; entry: ;
640 ; SI points to the first character on the line to scan. ;
641 ; ;
642 ; exit: ;
643 ; SI points to the first non-blank character found. ;
644 ; BX contains 0D hex if the first non-blank found is ;
645 ; a Carriage Return, otherwise it is 0. ;
646 ; ;
647 ; modifies: ;
648 ; BX, SI, and AX ;
649 ; ;
650 ;--------------------------------------------------------------------;
651 kill_bl:
652 cld ;increment
653 xor bx,bx ;zero bx to start: no CR found
654 no_bl:
655 lodsb ;get rid of blanks
656 cmp al,' '
657 je no_bl
658 cmp al,CR
659 jnz no_cr
660 mov bx,ax ;make bx non-zero (actually 0dh)
661 no_cr:
662 dec si ;adjust pointer
663 ret
664
665
666 ;--------------------------------------------------------------------;
667 ; Clear Counters ;
668 ;--------------------------------------------------------------------;
669 clr_cntrs:
670 mov byte ptr es:mtch_cntr,0
671 mov byte ptr es:line_cntr,0
672 ret
673
674 ;--------------------------------------------------------------------;
675 ; Print Count of Matched lines ;
676 ; ;
677 ; Modifies: AX,CX,DX and DI ;
678 ;--------------------------------------------------------------------;
679 print_count:
680 push bx ;save handle
681 cmp bx,std_in ;using std_in?
682 jz sj3 ;if so do not print file name
683
684 mov dx,offset colon
685 mov cx,2
686 call prout ;print colon
687 sj3:
688 mov ax,ds:mtch_cntr
689 mov di,offset n2_buf ;buffer for characters
690 call bin2asc ;convert to ascii
691 mov dx,offset n2_buf
692 call prout ;print the number
693 mov dx,offset crlf
694 mov cx,2
695 call prout ;print an end of line
696 pop bx
697 ret
698
699
700 ;--------------------------------------------------------------------;
701 ; Print relative line number ;
702 ; ;
703 ; Modifies: AX,CX and DI ;
704 ;--------------------------------------------------------------------;
705 prt_lcntr:
706 push bx
707 push dx
708 mov ax,ds:line_cntr
709 mov di,offset n2_buf
710 call bin2asc
711 mov byte ptr[di],"]"
712 inc cx
713 inc cx
714 mov dx,offset n1_buf
715 call prout
716 pop dx
717 pop bx
718 ret
719
720 ;--------------------------------------------------------------------;
721 ; Print string to STD_OUT ;
722 ;--------------------------------------------------------------------;
723 prout:
724 mov bx,std_out
725 mov ah,write
726 int dos_ent
727 ret
728
729
730 ;--------------------------------------------------------------------;
731 ; Binary to Ascii conversion routine ;
732 ; ;
733 ; Entry: ;
734 ; AX Binary number ;
735 ; DI Points to one past the last char in the ;
736 ; result buffer. ;
737 ; ;
738 ; Exit: ;
739 ; Result in the buffer MSD first ;
740 ; CX Digit count ;
741 ; ;
742 ; Modifies: ;
743 ; AX,BX,CX,DX and DI ;
744 ; ;
745 ;--------------------------------------------------------------------;
746 bin2asc:
747 mov bx,0ah
748 xor cx,cx
749 go_div:
750 inc cx
751 cmp ax,bx
752 jb div_done
753 xor dx,dx
754 div bx
755 add dl,'0' ;convert to ASCII
756 push dx
757 jmp short go_div
758
759 div_done:
760 add al,'0'
761 push ax
762 mov bx,cx
763 deposit:
764 pop ax
765 stosb
766 loop deposit
767 mov cx,bx
768 ret
769
770
771 ;--------------------------------------------------------------------;
772 ; Print the current file name ;
773 ; ;
774 ; modifies: ;
775 ; DX, CX, BX and AX ;
776 ;--------------------------------------------------------------------;
777 prt_file_name:
778 mov dx,offset file_name_buf ;print the file name
779 mov cx,ds:file_name_len ;retrive file name length
780 jmp short prt_err_2
781
782
783 ;--------------------------------------------------------------------;
784 ; Print an error message to the Standart error ;
785 ; ;
786 ; entry: ;
787 ; DX has the pointer to the message ;
788 ; CX has the length of the message ;
789 ; ;
790 ; modifies: ;
791 ; BX and AX ;
792 ;--------------------------------------------------------------------;
793 prt_err:
794 push ds ;Save the current DS
795 push cs ;Make DS point to the right
796 pop ds ; place, for DOS use.
797 call prt_err_2
798 pop ds
799 ret
800
801 prt_err_2:
802 xor ch,ch
803 mov bx,std_err
804 mov ah,write
805 int dos_ent ;write error message
806 ret
807
808
809 ;--------------------------------------------------------------------;
810 ; CAPIALIZES THE CHARACTER IN AL ;
811 ; ;
812 ; entry: ;
813 ; AL has the character to Capitalize ;
814 ; ;
815 ; exit: ;
816 ; AL has the capitalized character ;
817 ; ;
818 ; modifies: ;
819 ; AL ;
820 ;--------------------------------------------------------------------;
821 make_caps:
822 cmp al,'a'
823 jb no_cap
824 cmp al,'z'
825 jg no_cap
826 and al,0dfh
827 no_cap:
828 ret
829
830
831
832 IF KANJI
833
834 ;--------------------------------------------------------------------;
835 ; ADVANCE POINTER TO NEXT KANJI CHARACTER ;
836 ; ;
837 ; entry: DI points to a Kanji string ;
838 ; CX length in bytes of the string ;
839 ; ;
840 ; exit: DI points to next Kanji char ;
841 ; CX has number of bytes left ;
842 ; ;
843 ; modifies: AX ;
844 ; ;
845 ;--------------------------------------------------------------------;
846 next_kchar:
847 jcxz no_kleft
848 call is_prefix
849 jnc no_p
850 inc di
851 dec cx
852 jcxz no_kleft ; for insurance
853 no_p:
854 inc di
855 dec cx
856 clc
857 ret
858
859 no_kleft:
860 stc
861 ret
862
863
864 ;--------------------------------------------------------------------;
865 ; FIND OUT IS THE BYTE IS A KANJI PREFIX ;
866 ; ;
867 ; entry: DI points to a kanji string ;
868 ; ;
869 ; exit: Carry set if it is a kanji prefix ;
870 ; ;
871 ; modifies: AX ;
872 ; ;
873 ;--------------------------------------------------------------------;
874 is_prefix:
875 mov al,byte ptr [di]
876 cmp al,81h
877 jb nok
878 cmp al,0a0h
879 jb isk
880 cmp al,0e0h
881 jb nok
882 cmp al,0fdh
883 jb isk
884 nok:
885 clc
886 ret
887 isk:
888 stc
889 ret
890
891 ENDIF
892
893
894 ;----- PATCH AREA ---------------------------------------------------;
895
896 patch_area dw 100h dup(?)
897
898
899
900 ;----- BUFFER AREA --------------------------------------------------;
901 st_length dw 0 ;String argumnet length
902 st_buffer db st_buf_size dup(?) ;String argument buffer
903
904 file_name_len dw 0 ;File name length
905 file_name_buf db fname_buf_size+1 dup(?) ;File name buffer,(allow for
906 ; null at the end).
907
908 buffer db buffer_size+1 dup(?) ;file buffer, the last byte is
909 ;a guard in case of forced insertion
910 ;of a CRLF pair.
911
912 ;----- ERROR MESSAGES -----------------------------------------------;
913 EXTRN bad_vers:byte,crlf:byte,errmsg1:byte,errlen1:byte,errmsg2:byte
914 EXTRN errmsg3_pre:byte,errlen3_pre:byte
915 EXTRN errmsg3_post:byte,errlen3_post:byte
916 EXTRN errmsg4_pre:byte,errlen4_pre:byte
917 EXTRN errmsg4_post:byte,errlen4_post:byte
918 EXTRN heading:byte,heading_len:byte,errlen2:byte
919 EXTRN errmsg5:byte,errmsg5_opt:byte,errlen5:byte
920 code ends
921
922
923 ;----- STACK AREA ---------------------------------------------------;
924 stack segment stack
925
926 dw 64 dup(?,?)
927 stack_top equ $
928
929 stack ends
930
931 end start
932
The original sources of MS-DOS 1.25, 2.0, and 4.0 for reference purposes