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	fmtlocale.c - 9base - revived minimalist port of Plan 9 userland to Unix
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	fmtlocale.c (1348B)
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	1 /* Copyright (c) 2004 Google Inc.; see LICENSE */
	2
	3 #include <stdarg.h>
	4 #include <string.h>
	5 #include "plan9.h"
	6 #include "fmt.h"
	7 #include "fmtdef.h"
	8
	9 /*
	10 * Fill in the internationalization stuff in the State structure.
	11 * For nil arguments, provide the sensible defaults:
	12 * decimal is a period
	13 * thousands separator is a comma
	14 * thousands are marked every three digits
	15 */
	16 void
	17 fmtlocaleinit(Fmt f, char decimal, char thousands, char grouping)
	18 {
	19 if(decimal == nil \|\| decimal[0] == '\0')
	20 decimal = ".";
	21 if(thousands == nil)
	22 thousands = ",";
	23 if(grouping == nil)
	24 grouping = "\3";
	25 f->decimal = decimal;
	26 f->thousands = thousands;
	27 f->grouping = grouping;
	28 }
	29
	30 /*
	31 * We are about to emit a digit in e.g. %'d. If that digit would
	32 * overflow a thousands (e.g.) grouping, tell the caller to emit
	33 * the thousands separator. Always advance the digit counter
	34 * and pointer into the grouping descriptor.
	35 */
	36 int
	37 __needsep(int ndig, char *grouping)
	38 {
	39 int group;
	40
	41 (*ndig)++;
	42 group = (unsigned char)*grouping;
	43 /* CHAR_MAX means no further grouping. \0 means we got the empty…
	44 if(group == 0xFF \|\| group == 0x7f \|\| group == 0x00)
	45 return 0;
	46 if(*ndig > group){
	47 /* if we're at end of string, continue with this groupin…
	48 if((*grouping)[1] != '\0')
	49 (*grouping)++;
	50 *ndig = 1;
	51 return 1;
	52 }
	53 return 0;
	54 }
	55