Fix MinGW build, broken by my previous patch to add a setlocale() wrapper

on Windows. ecpglib doesn't link with libpgport, but picks and compiles
the .c files it needs individually. To cope with that, move the setlocale()
wrapper from chklocale.c to a separate setlocale.c file, and include that
in ecpglib.

src/port/win32setlocale.c

@@ -0,0 +1,115 @@
+/*-------------------------------------------------------------------------
+ *
+ * win32setlocale.c
+ *		Wrapper to work around bugs in Windows setlocale() implementation
+ *
+ * Copyright (c) 2011, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	  src/port/win32setlocale.c
+ *
+ *
+ * Windows has a problem with locale names that have a dot in the country
+ * name. For example:
+ *
+ * "Chinese (Traditional)_Hong Kong S.A.R..950"
+ *
+ * For some reason, setlocale() doesn't accept that. Fortunately, Windows'
+ * setlocale() accepts various alternative names for such countries, so we
+ * provide a wrapper setlocale() function that maps the troublemaking locale
+ * names to accepted aliases.
+ *-------------------------------------------------------------------------
+ */
+
+#include "c.h"
+
+#undef setlocale
+
+struct locale_map
+{
+	const char *locale_name_part;	/* string in locale name to replace */
+	const char *replacement;		/* string to replace it with */
+};
+
+static const struct locale_map locale_map_list[] = {
+
+	/*
+	 * "HKG" is listed here:
+	 * http://msdn.microsoft.com/en-us/library/cdax410z%28v=vs.71%29.aspx
+	 * (Country/Region Strings).
+	 *
+	 * "ARE" is the ISO-3166 three-letter code for U.A.E. It is not on the
+	 * above list, but seems to work anyway.
+	 */
+	{ "Hong Kong S.A.R.",						"HKG" },
+	{ "U.A.E.",									"ARE" },
+
+	/*
+	 * The ISO-3166 country code for Macau S.A.R. is MAC, but Windows doesn't
+	 * seem to recognize that. And Macau isn't listed in the table of
+	 * accepted abbreviations linked above. Fortunately, "ZHM" seems to be
+	 * accepted as an alias for "Chinese (Traditional)_Macau S.A.R..950". I'm
+	 * not sure where "ZHM" comes from, must be some legacy naming scheme. But
+	 * hey, it works.
+	 *
+	 * Note that unlike HKG and ARE, ZHM is an alias for the *whole* locale
+	 * name, not just the country part.
+	 *
+	 * Some versions of Windows spell it "Macau", others "Macao".
+	 */
+	{ "Chinese (Traditional)_Macau S.A.R..950",	"ZHM" },
+	{ "Chinese_Macau S.A.R..950",				"ZHM" },
+	{ "Chinese (Traditional)_Macao S.A.R..950",	"ZHM" },
+	{ "Chinese_Macao S.A.R..950",				"ZHM" }
+};
+
+char *
+pgwin32_setlocale(int category, const char *locale)
+{
+	char	   *result;
+	char	   *alias;
+	int			i;
+
+	if (locale == NULL)
+		return setlocale(category, locale);
+
+	/* Check if the locale name matches any of the problematic ones. */
+	alias = NULL;
+	for (i = 0; i < lengthof(locale_map_list); i++)
+	{
+		const char *needle = locale_map_list[i].locale_name_part;
+		const char *replacement = locale_map_list[i].replacement;
+		char	   *match;
+
+		match = strstr(locale, needle);
+		if (match != NULL)
+		{
+			/* Found a match. Replace the matched string. */
+			int		matchpos = match - locale;
+			int		replacementlen = strlen(replacement);
+			char   *rest = match + strlen(needle);
+			int		restlen = strlen(rest);
+
+			alias = malloc(matchpos + replacementlen + restlen + 1);
+			if (!alias)
+				return NULL;
+
+			memcpy(&alias[0], &locale[0], matchpos);
+			memcpy(&alias[matchpos], replacement, replacementlen);
+			memcpy(&alias[matchpos + replacementlen], rest, restlen + 1); /* includes null terminator */
+
+			break;
+		}
+	}
+
+	/* Call the real setlocale() function */
+	if (alias)
+	{
+		result = setlocale(category, alias);
+		free(alias);
+	}
+	else
+		result = setlocale(category, locale);
+
+	return result;
+}