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cc7f765f2c
This commit is the initial sync of all files from ruby/yarp into ruby/ruby. Notably, it does the following: * Sync all ruby/yarp/lib/ files to ruby/ruby/lib/yarp * Sync all ruby/yarp/src/ files to ruby/ruby/yarp/ * Sync all ruby/yarp/test/ files to ruby/ruby/test/yarp
25 lines
526 B
C
25 lines
526 B
C
#include "yarp/util/yp_state_stack.h"
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// Initializes the state stack to an empty stack.
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void
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yp_state_stack_init(yp_state_stack_t *stack) {
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*stack = 0;
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}
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// Pushes a value onto the stack.
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void
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yp_state_stack_push(yp_state_stack_t *stack, bool value) {
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*stack = (*stack << 1) | (value & 1);
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}
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// Pops a value off the stack.
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void
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yp_state_stack_pop(yp_state_stack_t *stack) {
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*stack >>= 1;
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}
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// Returns the value at the top of the stack.
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bool
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yp_state_stack_p(yp_state_stack_t *stack) {
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return *stack & 1;
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}
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