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[/] [forwardcom/] [libraries/] [clear_input_light.as] - Blame information for rev 141

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1 72 Agner
/****************************  clear_input_light.as ***************************
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* Author:        Agner Fog
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* date created:  2021-05-31
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* Last modified: 2021-05-31
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* Version:       1.11
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* Project:       ForwardCom library libc_light.li
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* Description:   clear_input: Clear input buffer for stdin
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* This version is for small CPUs with limited capabilities
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* The following instructions are avoided: mul, div, push, pop, sys_call.
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* Input comes directly from input port 8
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* Output to stdout goes directly to output port 10
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*
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* C declaration:
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* void clear_input();
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*
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* Copyright 2021 GNU General Public License http://www.gnu.org/licenses
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*****************************************************************************/
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// define input and output port numbers
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%stdin_port = 8
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%stdin_status_port = 9
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%stdout_port = 10
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code section execute
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_clear_input function public reguse = 0, 0
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  // save r1
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  int64 sp -= 1*8
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  int64 [sp] = r1
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  int r1 = 1
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  int output(r1,r1,stdin_status_port)  // clear input buffer
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  // restore r1
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  int64 r1 = [sp]
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  int64 sp += 1*8
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  return
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_clear_input end
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code end

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