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84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
#ifndef CORO_H
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#define CORO_H
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/*
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Released under the CC0: https://creativecommons.org/publicdomain/zero/1.0/
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*/
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/* Use at the beginning of the coroutine, you must have declared a variable coro_t* coro */
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#define CORO_ENTER() \
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{ \
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CORO_again: ; \
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switch ( coro->step ) { \
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case CORO_BEGIN: ;
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/* Use to define labels which are targets to GOTO and GOSUB */
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#define CORO_SUB( x ) \
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case x: ;
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/* Use at the end of the coroutine */
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#define CORO_LEAVE() \
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} \
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} \
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do { return 0; } while ( 0 )
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/* Go to the x label */
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#define CORO_GOTO( x ) \
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do { \
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coro->step = ( x ); \
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goto CORO_again; \
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} while ( 0 )
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/* Go to a subroutine, execution continues until the subroutine returns via RET */
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/* x is the subroutine label, y and z are the A and B arguments */
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#define CORO_GOSUB( x ) \
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do { \
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coro->stack[ coro->sp++ ] = __LINE__; \
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coro->step = ( x ); \
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goto CORO_again; \
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case __LINE__: ; \
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} while ( 0 )
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/* Returns from a subroutine */
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#define CORO_RET() \
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do { \
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coro->step = coro->stack[ --coro->sp ]; \
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goto CORO_again; \
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} while ( 0 )
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/* Yields to the caller, execution continues from this point when the coroutine is resumed */
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#define CORO_YIELD() \
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do { \
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coro->step = __LINE__; \
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return 1; \
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case __LINE__: ; \
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} while ( 0 )
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#define CORO_STOP() \
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do { \
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return 0; \
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} while ( 0 )
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/* The coroutine entry point, never use 0 as a label */
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#define CORO_BEGIN 0
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/* Sets up a coroutine, x is a pointer to coro_t */
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#define CORO_SETUP( x ) \
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do { \
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( x )->step = CORO_BEGIN; \
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( x )->sp = 0; \
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} while ( 0 )
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#define CORO_VAR( x ) ( coro->x )
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/* A coroutine */
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typedef struct
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{
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CORO_VARS
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int step, sp;
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int stack[ 8 ];
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}
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coro_t;
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#endif /* CORO_H */
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