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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2014-xxxx
license		=	bsd



%%	header

/** @file	dk3masts.h	Retrieve size_t from dkChar text.
*/

#ifdef __cplusplus
extern "C" {
#endif

/**	Convert string to size_t. The string can optionally contain an
	``k'', ``K'', ``m'', ``M'', ``g'', or ``G'' suffix.
	@param	rp	Pointer to result variable.
	@param	src	Source text to convert.
	@param	ec	Pointer to error code variable, may be NULL.
	Set to DK3_ERROR_INVALID_ARGS if rp and/or src is NULL or
	the string is too long for the internal buffer,
	DK3_ERROR_SYNTAX if unacceptable characters found,
	DK3_ERROR_MATH_OVERFLOW on numeric overflow.
	@return	1 on success, 0 on error (see ec).
*/
int
dk3ma_sz_from_string(size_t *rp, dkChar const *src, int *ec);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk3ma.h"
#include <stdio.h>
#include "dk3mem.h"
#include "dk3str.h"



$!trace-include



int
dk3ma_sz_from_string(size_t *rp, dkChar const *src, int *ec)
{
  /* Private copy of string, can be modified. */
  dkChar	 buffer[DK3_MEM_ALIGN((8*sizeof(dk3_um_t)+1),16)];
  dkChar const	*ptr;			/* Start of original text */
  size_t	 lgt;			/* Length of text in buffer */
  dk3_um_t	 convres = (dk3_um_t)1;	/* Conversion result */
  dk3_um_t	 factor	=  (dk3_um_t)1;	/* Constant factor */
  int		 myec	=	0;	/* Private error code */
  int		 back	=	0;	/* Function result */
  int		 done	=	0;	/* Flag: No conversion necessary */
  $? "+ dk3ma_sz_from_string %!ds", TR_STR(src)
  if ((NULL != rp) && (NULL != src)) {
    ptr = dk3str_start(src, NULL);
    if (NULL != ptr) {
      if (dk3str_len(ptr) < DK3_SIZEOF(buffer,dkChar)) {
        dk3str_cpy(buffer, ptr);
	dk3str_chomp(buffer, NULL);
	lgt = dk3str_len(buffer);
	if (0 < lgt) {
	  switch(buffer[lgt-1]) {
	    case dkT('k'): case dkT('K'): {
	      factor = (dk3_um_t)1024;
	      buffer[lgt-1] = dkT('\0');
	      if (1 == lgt) { done = 1; }
	    } break;
	    case dkT('m'): case dkT('M'): {
	      factor = dk3ma_um_mul_ok((dk3_um_t)1024, (dk3_um_t)1024, &myec);
	      buffer[lgt-1] = dkT('\0');
	      if (1 == lgt) { done = 1; }
	    } break;
	    case dkT('g'): case dkT('G'): {
	      factor = dk3ma_um_mul_ok(
	        dk3ma_um_mul_ok((dk3_um_t)1024, (dk3_um_t)1024, &myec),
		(dk3_um_t)1024, &myec
	      );
	      buffer[lgt-1] = dkT('\0');
	      if (1 == lgt) { done = 1; }
	    } break;
	  }
	  if (0 == myec) {
	    if (0 == done) {		$? ". must scan"
	      if (0 != dk3ma_um_from_string(&convres, buffer, ec)) {
	        $? ". scan ok"
	        convres = dk3ma_um_mul_ok(convres, factor, &myec);
		if ((dk3_um_t)DK3_SIZE_T_MAX >= convres) {
		  *rp = (size_t)convres;
		  back = 1;
#if DK3_ON_WINDOWS
		  $? ". size = %I64u", convres
#else
		  $? ". size = %ju", (uintmax_t)convres
#endif
		} else {		$? "! overflow"
		  if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
		}
	      } else {			$? "! failed to scan"
	      }
	    } else {			$? ". simply unit, no number"
	      convres = dk3ma_um_mul_ok(convres, factor, &myec);
	      if ((dk3_um_t)DK3_SIZE_T_MAX >= convres) {
	        *rp = (size_t)convres;
	        back = 1;		$? ". success"
#if DK3_ON_WINDOWS
		$? ". size = %I64u", convres
#else
		$? ". size = %ju", (uintmax_t)convres
#endif
	      } else {			$? "! overflow"
	        if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
	      }
	    }
	    if (1 == back) {
	      if (0 != myec) {		$? "! internal error"
	        back = 0;
		if (NULL != ec) { *ec = myec; }
	      }
	    }
	  } else {			$? "! myec set"
	    if (NULL != ec) { *ec = myec; }
	  }
	} else {			$? "! empty string"
	  if (NULL != ec) { *ec = DK3_ERROR_INVALID_ARGS; }
	}
      } else {				$? "! string too long"
        if (NULL != ec) { *ec = DK3_ERROR_INVALID_ARGS; }
      }
    } else {				$? "! empty string"
      if (NULL != ec) { *ec = DK3_ERROR_INVALID_ARGS; }
    }
  } else {				$? "! invalid arguments"
    if (NULL != ec) { *ec = DK3_ERROR_INVALID_ARGS; }
  } $? "- dk3ma_sz_from_string %d", back
  return back;
}