From 8e736672475377d63007b26b58b7a5c6af335e40 Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Tue, 15 Mar 2011 13:59:34 +0000
Subject: initial commit

---
 .gitignore    |  2 ++
 Makefile      | 14 +++++++++++++
 lua-posixtz.c | 27 ++++++++++++++++++++++++
 main.c        | 23 ++++++++++++++++++++
 posixtz.c     | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 posixtz.h     |  6 ++++++
 6 files changed, 139 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 lua-posixtz.c
 create mode 100644 main.c
 create mode 100644 posixtz.c
 create mode 100644 posixtz.h

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..52a68ca
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+posixtz
+posixtz.so
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4370b38
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+LUALIBS := -llua
+
+TARGETS := posixtz posixtz.so
+all: $(TARGETS)
+
+clean:
+	rm -f $(TARGETS)
+
+posixtz: main.c posixtz.c
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
+
+posixtz.so: lua-posixtz.c posixtz.c
+	$(CC) -fPIC $(CFLAGS) $(LDFLAGS) $(LUALIBS) -shared -o $@ $^
+
diff --git a/lua-posixtz.c b/lua-posixtz.c
new file mode 100644
index 0000000..0754f97
--- /dev/null
+++ b/lua-posixtz.c
@@ -0,0 +1,27 @@
+
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+#include "posixtz.h"
+
+#define MYNAME "posixtz"
+
+static int Pfrom_file(lua_State *L)
+{
+	const char *s = luaL_checkstring(L, 1);
+	lua_pushstring(L, posix_tz(s));
+	return 1;
+}
+
+static const luaL_reg R[] =
+{
+	{"from_file",		Pfrom_file},
+	NULL, NULL
+};
+	
+
+LUALIB_API int luaopen_posixtz(lua_State *L)
+{
+	luaL_register(L,MYNAME,R);
+	return 1;
+}
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..9e78c04
--- /dev/null
+++ b/main.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include "posixtz.h"
+
+int usage() {
+	printf("Print POSIX TZ string from compiled tzdata\n"
+		"Usage: posixtz FILE...\n");
+	return -1;
+}
+
+int main(int argc, char *argv[])
+{
+	int i=1;
+	if (argc <= 1)
+		return usage();
+
+	for (i = 1; i < argc; i++) {
+		char *s = posix_tz(argv[i++]);
+		if (s != NULL)
+			printf("%s\n", s);
+	}
+	return 0;
+}
+
diff --git a/posixtz.c b/posixtz.c
new file mode 100644
index 0000000..cddcb3e
--- /dev/null
+++ b/posixtz.c
@@ -0,0 +1,67 @@
+/* ripped from uclibc 
+*
+* Copyright (C) 2010 Denys Vlasenko <vda.linux@googlemail.com>
+* Copyright (C) 2011 Natanael Copa <ncopa@alpinelinux.org>
+*
+* GNU Library General Public License (LGPL) version 2 or later.
+*
+*/
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+
+#include "posixtz.h"
+
+#ifndef TZNAME_MAX
+#define TZNAME_MAX _POSIX_TZNAME_MAX
+#endif
+
+#define TZ_BUFLEN               (2*TZNAME_MAX + 56)
+
+char *posix_tz(const char *filename)
+{
+	int fd, r;
+	static char buf[TZ_BUFLEN];
+	char *p = NULL;
+	fd = open(filename, O_RDONLY);
+	if (fd < 0)
+		return NULL;
+	
+	r = read(fd, buf, TZ_BUFLEN);
+	if (r != TZ_BUFLEN
+	    || strncmp(buf, "TZif", 4) != 0
+	    || (unsigned char)buf[4] < 2
+	    || lseek(fd, -TZ_BUFLEN, SEEK_END) < 0
+	   )
+		goto ERROR;
+
+	/* tzfile.h from tzcode database says about TZif2+ files:
+	**
+	** If tzh_version is '2' or greater, the above is followed by a second instance
+	** of tzhead and a second instance of the data in which each coded transition
+	** time uses 8 rather than 4 chars,
+	** then a POSIX-TZ-environment-variable-style string for use in handling
+	** instants after the last transition time stored in the file
+	** (with nothing between the newlines if there is no POSIX representation for
+	** such instants).
+	*/
+	r = read(fd, buf, TZ_BUFLEN);
+	if (r <= 0 || buf[--r] != '\n')
+		goto ERROR;
+	buf[r] = 0;
+	while (r != 0) {
+		if (buf[--r] == '\n') {
+			p = buf + r + 1;
+			break;
+		}
+	} /* else ('\n' not found): p remains NULL */
+ERROR:
+	close(fd);
+	return p;
+}
+
diff --git a/posixtz.h b/posixtz.h
new file mode 100644
index 0000000..3133723
--- /dev/null
+++ b/posixtz.h
@@ -0,0 +1,6 @@
+#ifndef POSIXTZ_H
+#define POSIXTZ_H
+
+char *posix_tz(const char *filename);
+
+#endif
-- 
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