From 95e7ec1ab5c1de11719be901a8b8451a49fa6c7b Mon Sep 17 00:00:00 2001
From: pommicket <pommicket@gmail.com>
Date: Tue, 15 Feb 2022 16:48:18 -0500
Subject: locale.h

---
 05/locale.h | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 05/main.c   |  9 ++++-----
 2 files changed, 64 insertions(+), 5 deletions(-)
 create mode 100644 05/locale.h

diff --git a/05/locale.h b/05/locale.h
new file mode 100644
index 0000000..af90729
--- /dev/null
+++ b/05/locale.h
@@ -0,0 +1,60 @@
+#ifndef _LOCALE_H
+#define _LOCALE_H
+
+#include <stdc_common.h>
+
+struct lconv {
+	char *decimal_point;       /* "." */
+	char *thousands_sep;       /* "" */
+	char *grouping;            /* "" */
+	char *int_curr_symbol;     /* "" */
+	char *currency_symbol;     /* "" */
+	char *mon_decimal_point;   /* "" */
+	char *mon_thousands_sep;   /* "" */
+	char *mon_grouping;        /* "" */
+	char *positive_sign;       /* "" */
+	char *negative_sign;       /* "" */
+	char int_frac_digits;      /* CHAR_MAX */
+	char frac_digits;          /* CHAR_MAX */
+	char p_cs_precedes;        /* CHAR_MAX */
+	char p_sep_by_space;       /* CHAR_MAX */
+	char n_cs_precedes;        /* CHAR_MAX */
+	char n_sep_by_space;       /* CHAR_MAX */
+	char p_sign_posn;          /* CHAR_MAX */
+	char n_sign_posn;          /* CHAR_MAX */
+};
+
+// these are GCC's constants, but it doesn't really matter which constants we use.
+#define LC_ALL 6
+#define LC_COLLATE 3
+#define LC_CTYPE 0
+#define LC_MONETARY 4
+#define LC_NUMERIC 1
+#define LC_TIME 2
+
+char *setlocale(int category, char *locale) {
+	if (!locale) return "C";
+	if (*locale == 'C' && !locale[1]) {
+		// yep
+		return "C";
+	}
+	
+	// we only support the C locale
+	return NULL;
+	
+}
+
+struct lconv *localeconv(void) {
+	static struct lconv conv = {
+		".",
+		"", "", "",
+		"", "", "",
+		"", "", "",
+		CHAR_MAX, CHAR_MAX, CHAR_MAX,
+		CHAR_MAX, CHAR_MAX, CHAR_MAX,
+		CHAR_MAX, CHAR_MAX
+	};
+	return &conv;
+}
+
+#endif // _LOCALE_H
diff --git a/05/main.c b/05/main.c
index b02f95f..a77ccf2 100644
--- a/05/main.c
+++ b/05/main.c
@@ -4,13 +4,12 @@
 #include <stdlib.h>
 #include <stddef.h>
 #include <ctype.h>
-
-typedef struct {
-	int x;
-	long y;
-} S;
+#include <locale.h>
 
 int main(int argc, char **argv) {
+	setlocale(LC_ALL, "C");
+	struct lconv *c = localeconv();
+	printf("%s\n",c->negative_sign);
 	return 0;
 }
 
-- 
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