Move separate_thousands() to str_util so it can be used elsewhere, later

Seems a useful function to have on hand. Especially now that it's "fixed"
(will convert "1234" to "1,234").

src/sbbs3/atcodes.cpp

@@ -33,27 +33,6 @@
 	#define	SOCKLIB_DESC NULL
 #endif
 
-static char* separate_thousands(const char* src, char *dest, size_t maxlen, char sep)
-{
-	if(strlen(src) * 1.3 > maxlen)
-		return (char*)src;
-	const char* tail = src;
-	while(*tail && IS_DIGIT(*tail))
-		tail++;
-	if(tail == src)
-		return (char*)src;
-	size_t digits = tail - src;
-	char* d = dest;
-	for(size_t i = 0; i < digits; d++, i++) {
-		*d = src[i];
-		if(i + 3 < digits && (digits - (i + 1)) % 3 == 0)
-			*(++d) = sep;
-	}
-	*d = 0;
-	strcpy(d, tail);
-	return dest;
-}
-
 struct atcode_format {
 	int		disp_len;
 	enum {

src/sbbs3/str_util.c

@@ -712,3 +712,23 @@ char* utf8_to_cp437_inplace(char* str)
 		,/* decode error char: */CP437_INVERTED_EXCLAMATION_MARK);
 }
 
+char* separate_thousands(const char* src, char *dest, size_t maxlen, char sep)
+{
+	if(strlen(src) * 1.3 > maxlen)
+		return (char*)src;
+	const char* tail = src;
+	while(*tail && IS_DIGIT(*tail))
+		tail++;
+	if(tail == src)
+		return (char*)src;
+	size_t digits = tail - src;
+	char* d = dest;
+	for(size_t i = 0; i < digits; d++, i++) {
+		*d = src[i];
+		if(i + 3 < digits && (digits - (i + 1)) % 3 == 0)
+			*(++d) = sep;
+	}
+	*d = 0;
+	strcpy(d, tail);
+	return dest;
+}

src/sbbs3/str_util.h

@@ -63,6 +63,7 @@ DLLEXPORT uint32_t	str_to_bits(uint32_t currval, const char *str);
 DLLEXPORT bool		str_has_ctrl(const char*);
 DLLEXPORT bool		str_is_ascii(const char*);
 DLLEXPORT char *	utf8_to_cp437_inplace(char* str);
+DLLEXPORT char *	separate_thousands(const char* src, char *dest, size_t maxlen, char sep);
 
 #ifdef __cplusplus
 }