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35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
#include <stdint.h>
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#include <stddef.h>
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#include <complex.h>
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#include <stdio.h>
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#define BASEUNITS 7
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struct quantity {
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/* this is the only time you will ever catch me using double complex */
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double complex value;
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int8_t units[BASEUNITS]; /* metre, kilogram, second, ampere, kelvin, candela, mol */
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uint8_t flags;
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};
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#define QRPN_NOERR 0
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#define QRPN_ERROR_NOT_ENOUGH_STACK 1
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#define QRPN_ERROR_INCONSISTENT_UNITS 2
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#define QRPN_ERROR_MUST_BE_INTEGER 3
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#define QRPN_ERROR_TOKEN_UNRECOGNIZED 4
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#define QRPN_ERROR_RATIONAL_NOT_IMPLEMENTED 5
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#define QRPN_ERROR_MUST_BE_UNITLESS 6
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#define QRPN_ERROR_DOMAIN 7
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#define QRPN_ERROR_DIMENSION_OVERFLOW 8
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#define QRPN_WAS_A_UNIT 9
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#define FLAG_UNIT_ENTERS_AS_OPERAND 1
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#define FLAG_SI_BASE_UNIT 4
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#define FLAG_SI_DERIVED_UNIT 8
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int qrpn_evaluate_token(struct quantity ** stack_p, size_t * S_p, const char * const token);
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char * qrpn_error_string(const int status);
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void fprintf_stack(FILE * fh, struct quantity * stack, const size_t S);
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void fprintf_quantity(FILE * fh, const struct quantity quantity);
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int qrpn_try_token(const struct quantity * const stack, const size_t S, const char * const token);
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