/* Copyright (c) 2004 Google Inc.; see LICENSE */

#include <stdarg.h>

#include <string.h>

#include "plan9.h"

#include "fmt.h"

#include "fmtdef.h"

/*

 * Fill in the internationalization stuff in the State structure.

 * For nil arguments, provide the sensible defaults:

 *  decimal is a period

 *  thousands separator is a comma

 *  thousands are marked every three digits

 */

void

fmtlocaleinit(Fmt *f, char *decimal, char *thousands, char *grouping)

{

  if(decimal == nil || decimal[0] == '\0')

    decimal = ".";

  if(thousands == nil)

    thousands = ",";

  if(grouping == nil)

    grouping = "\3";

  f->decimal = decimal;

  f->thousands = thousands;

  f->grouping = grouping;

}

/*

 * We are about to emit a digit in e.g. %'d.  If that digit would

 * overflow a thousands (e.g.) grouping, tell the caller to emit

 * the thousands separator.  Always advance the digit counter

 * and pointer into the grouping descriptor.

 */

int

__needsep(int *ndig, char **grouping)

{

  int group;

  (*ndig)++;

  group = *(unsigned char*)*grouping;

  /* CHAR_MAX means no further grouping. \0 means we got the empty string */

  if(group == 0xFF || group == 0x7f || group == 0x00)

    return 0;

  if(*ndig > group){

    /* if we're at end of string, continue with this grouping; else advance */

    if((*grouping)[1] != '\0')

      (*grouping)++;

    *ndig = 1;

    return 1;

  }

  return 0;

}