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3d97dc2c33
"Applet" is a much better name for the external command-line scripts and programs that can be loaded as PBot commands. They will no longer be confused with Perl modules. https://en.wikipedia.org/wiki/Applet
47 lines
2.0 KiB
C
47 lines
2.0 KiB
C
#include <stdint.h>
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#include <complex.h>
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#include <stdio.h>
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/* reasonably large fixed stack size given this is not a turing complete implemetation */
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#define QRPN_STACK_SIZE_MAX 32
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/* not going to change in this unverse */
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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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};
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/* mutate the stack, initially of size S, according to the current token, and return either the nonnegative new size S or a negative error code, which can be passed to qrpn_strerror to obtain a pointer to human-readable error string */
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int qrpn_evaluate_token(struct quantity * stack, int S, const char * const token);
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/* same, but operate on a temporary copy of the input and do not mutate the original */
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int qrpn_try_token(const struct quantity stack[static QRPN_STACK_SIZE_MAX], const int S, const char * const token);
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int qrpn_try_string(const struct quantity stack[static QRPN_STACK_SIZE_MAX], const int S, const char * const string);
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int qrpn_evaluate_string(struct quantity * const stack, int S, const char * string);
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/* given the value returned from a function above, return a pointer to a string literal */
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char * qrpn_strerror(const int status);
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/* utility functions */
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void fprintf_stack(FILE * fh, struct quantity * stack, const int S);
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void fprintf_quantity(FILE * fh, const struct quantity quantity);
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#define QRPN_ERROR_TOKEN_UNRECOGNIZED -1
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#define QRPN_ERROR_NOT_ENOUGH_STACK -2
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#define QRPN_ERROR_INCONSISTENT_UNITS -3
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#define QRPN_ERROR_MUST_BE_INTEGER -4
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#define QRPN_ERROR_MUST_BE_UNITLESS -5
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#define QRPN_ERROR_MUST_BE_REAL -6
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#define QRPN_ERROR_MUST_BE_NONNEGATIVE -7
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#define QRPN_ERROR_RATIONAL_NOT_IMPLEMENTED -8
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#define QRPN_ERROR_DOMAIN -9
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#define QRPN_ERROR_DIMENSION_OVERFLOW -10
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#define QRPN_ERROR_TOO_MUCH_STACK -11
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#define QRPN_ERROR_UNMATCHED_CONTROL_STATEMENT -12
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#define QRPN_ERROR_INEXACT_LITERAL -13
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