scalc.h

// avp 2016 (for ru.stackoverflow.com)
#ifndef _SCALC_H
#define _SCALC_H

#define CALC_OK         0
#define CALC_OUT_OF_MEM 1
#define CALC_NO_OP      2  // two operands without operation beetwen them
#define CALC_NO_VAL     3  // operand expected, but found ')' or operation
#define CALC_NO_RP      4  // unbalanced '(' ('(' found in stack by EOF)
#define CALC_NO_LP      5  // unbalanced ')' ('(' not found in stack)
#define CALC_ERR_OP     6  // invalid operation in expr() (internal error)
#define CALC_NO_NUMS    7  // no operands for current operation
#define CALC_NUMS_ERR   8  // at end operands stack depth greater than 1
#define CALC_OPRS_ERR   9  // at end operations left in stack
#define CALC_ERR_INPUT  10 // invalid input char (letter, graph ...)
#define CALC_NO_INPUT   11 // empty input
#define CALC_ERR_CODE   12 // invalid rc for message
#define CALC_EOD        13 // EOF


extern
#ifdef __cplusplus
"C" {
#endif
  // scalc.c http://pastebin.com/stQw5kyc
  int scalc (const char *str, double *pres);
  const char *scalc_strerr (int code);
#ifdef __cplusplus
}
#endif

#endif