51 lines
1.2 KiB
NASM
51 lines
1.2 KiB
NASM
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; Just print a "START" flag
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[i0:arg] syscall [ci:1] 'S'
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push 0 ; pushs string pointer argument
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cpget ; pushs return addr
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jmp @print_str ; Calls print_str(0)
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drop ; releases argument
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; Print the "END" marker
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[i0:arg] syscall [ci:1] 'Q'
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; End the program
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syscall [ci:0]
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; void print_str(char *string);
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print_str:
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bpget ; enter function by
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spget ; saving the parents base pointer
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bpset ; and storing the current stack pointer
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; char *ptr = string;
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get -2 ; get argument 0 into our local variable '#1'
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; while(*ptr) {
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print_str_loop:
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[i0:peek] loadi [f:yes] ; write flags, also load result, don't discard pointer
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[ex(z)=1] jmp @print_str_end_loop ; when *ptr == 0, then goto print_str_end_loop
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; char c = *ptr; // which is implicitly done by our while(*ptr)
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; putc(c);
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[i0:pop] syscall [ci:1] ; removes the loaded character and prints it
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; ptr++;
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[i0:arg] add 1 ; adds 1 to the stack top
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; }
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jmp @print_str_loop
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print_str_end_loop:
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drop ; discard the result from loadi
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drop ; discard our pointer
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; return
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bpget ; leave function
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spset ; by restoring parent base pointer
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bpset
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jmpi ; and jumping back.
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