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 string */
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 grouping; else advance */
48 		if((*grouping)[1] != '\0')
49 			(*grouping)++;
50 		*ndig = 1;
51 		return 1;
52 	}
53 	return 0;
54 }