mirror of
https://github.com/DoctorWkt/unix-jun72.git
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56 lines
1.4 KiB
Plaintext
56 lines
1.4 KiB
Plaintext
/ sh -- command interpreter
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mov sp,r5
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mov r5,shellarg / save orig sp in shellarg
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cmpb *2(r5),$'- / was this sh calleZd by init or loginx~
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bne 2f / no
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sys intr; 0 / yes, turn off interrupts
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sys quit; 0
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2:
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sys getuid / who is user
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tst r0 / is it superuser
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bne 2f / no
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movb $'#,at / yes, set new prompt symbol
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2:
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cmp (r5),$1 / tty input?
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ble newline / yes, call with '-(or with no command
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/ file name)
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clr r0 / no, set ttv
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sys close / close it
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mov 4(r5),0f / get new file name
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sys open; 0:..; 0 / open it
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bec 1f / branch if no error
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jsr r5,error / error in file name
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<Input not found\n\0>; .even
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sys exit
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1:
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clr at / clear prompt character, if reading non-tty
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/ input file
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newline:
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tst at / is there a prompt symbol
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beq newcom / no
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mov $1,r0 / yes
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sys write; at; 2. / print prompt
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newcom:
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mov shellarg,sp /
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mov $parbuf,r3 / initialize command list area
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mov $parp,r4 / initialize command list pointers
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clr infile / initialize alternate input
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clr outfile / initialize alternate output
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clr glflag / initialize global flag
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newarg:
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jsr pc,blank / squeeze out leading blanks
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jsr r5,delim / is new character a ; \n or &
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br 2f / yes
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mov r3,-(sp) / no, push arg pointer onto stack
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cmp r0,$'< / new input file?
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bne 1f / no
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mov (sp),infile / yes, save arg pointer
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clr (sp) / clear pointer
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br 3f
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1:
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cmp r0,$'> / new output file?
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bne newchar / no
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mov (sp),outfile / yes, save arg pointer
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clr (sp) / clear pointer
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br 3f
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