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From f2903432bf8779f32237cc2e620e2fb0ca161ffa Mon Sep 17 00:00:00 2001
From: Derick Rethans <github@derickrethans.nl>
Date: Mon, 26 Apr 2021 09:59:01 +0100
Subject: [PATCH] Fixed issue #112: Support empty POSIX string in older TZif2
 files

---
 parse_tz.c                            |  19 ++++++++++++---
 tests/c/files/Casablanca_AmazonLinux1 | Bin 0 -> 2428 bytes
 tests/c/files/Nuuk_AmazonLinux1       | Bin 0 -> 8294 bytes
 tests/c/parse_posix.cpp               |  32 ++++++++++++++++++++++++++
 timelib.c                             |   4 +++-
 timelib.h                             |   8 ++++---
 6 files changed, 56 insertions(+), 7 deletions(-)
 create mode 100644 tests/c/files/Casablanca_AmazonLinux1
 create mode 100644 tests/c/files/Nuuk_AmazonLinux1

diff --git a/ext/date/lib/parse_tz.c b/parse_tz.c
index ffeae2e..4e31b9e 100644
--- a/ext/date/lib/parse_tz.c
+++ b/ext/date/lib/parse_tz.c
@@ -553,11 +553,22 @@ void timelib_dump_tzinfo(timelib_tzinfo *tz)
 		timelib_free(date_str);
 	}
 
+	if (!tz->posix_string) {
+		printf("\n%43sNo POSIX string\n", "");
+		return;
+	}
+
+	if (strcmp("", tz->posix_string) == 0) {
+		printf("\n%43sEmpty POSIX string\n", "");
+		return;
+	}
+
 	printf("\n%43sPOSIX string: %s\n", "", tz->posix_string);
-	if (tz->posix_info->std) {
+	if (tz->posix_info && tz->posix_info->std) {
 		trans_str = format_offset_type(tz, tz->posix_info->type_index_std_type);
 		printf("%43sstd: %s\n", "", trans_str);
 		timelib_free(trans_str);
+
 		if (tz->posix_info->dst) {
 			trans_str = format_offset_type(tz, tz->posix_info->type_index_dst_type);
 			printf("%43sdst: %s\n", "", trans_str);
@@ -693,8 +704,10 @@ timelib_tzinfo *timelib_parse_tzfile(const char *timezone, const timelib_tzdb *t
 		}
 
 		read_posix_string(&tzf, tmp);
-		if (!integrate_posix_string(tmp)) {
-			*error_code = TIMELIB_ERROR_POSIX_MISSING_TTINFO;
+		if (strcmp("", tmp->posix_string) == 0) {
+			*error_code = TIMELIB_ERROR_EMPTY_POSIX_STRING;
+		} else if (!integrate_posix_string(tmp)) {
+			*error_code = TIMELIB_ERROR_CORRUPT_POSIX_STRING;
 			timelib_tzinfo_dtor(tmp);
 			return NULL;
 		}
diff --git a/ext/date/lib/timelib.c b/timelib.c
index 8db4df1..92366be 100644
--- a/ext/date/lib/timelib.c
+++ b/ext/date/lib/timelib.c
@@ -35,7 +35,7 @@
 
 #define TIMELIB_LLABS(y) (y < 0 ? (y * -1) : y)
 
-const char *timelib_error_messages[9] = {
+const char *timelib_error_messages[10] = {
 	"No error",
 	"Can not allocate buffer for parsing",
 	"Corrupt tzfile: The transitions in the file don't always increase",
@@ -44,6 +44,8 @@ const char *timelib_error_messages[9] = {
 	"The version used in this timezone identifier is unsupported",
 	"No timezone with this name could be found",
 	"A 'slim' timezone file has been detected",
+	"The embedded POSIX string is not valid",
+	"The embedded POSIX string is empty"
 };
 
 const char *timelib_get_error_message(int error_code)
diff --git a/ext/date/lib/timelib.h b/ext/date/lib/timelib.h
index 7073c6c..8e82e58 100644
--- a/ext/date/lib/timelib.h
+++ b/ext/date/lib/timelib.h
@@ -375,7 +375,8 @@ typedef struct _timelib_tzdb {
 #define TIMELIB_UNSET   -99999
 
 /* An entry for each of these error codes is also in the
- * timelib_error_messages array in timelib.c */
+ * timelib_error_messages array in timelib.c.
+ * Codes 0x00, 0x07, and 0x09 are warnings only. */
 #define TIMELIB_ERROR_NO_ERROR                            0x00
 #define TIMELIB_ERROR_CANNOT_ALLOCATE                     0x01
 #define TIMELIB_ERROR_CORRUPT_TRANSITIONS_DONT_INCREASE   0x02
@@ -383,8 +384,9 @@ typedef struct _timelib_tzdb {
 #define TIMELIB_ERROR_CORRUPT_NO_ABBREVIATION             0x04
 #define TIMELIB_ERROR_UNSUPPORTED_VERSION                 0x05
 #define TIMELIB_ERROR_NO_SUCH_TIMEZONE                    0x06
-#define TIMELIB_ERROR_SLIM_FILE                           0x07
-#define TIMELIB_ERROR_POSIX_MISSING_TTINFO                0x08
+#define TIMELIB_ERROR_SLIM_FILE                           0x07 /* Warns if the file is SLIM, but we can't read it */
+#define TIMELIB_ERROR_CORRUPT_POSIX_STRING                0x08
+#define TIMELIB_ERROR_EMPTY_POSIX_STRING                  0x09 /* Warns if the POSIX string is empty, but still produces results */
 
 #ifdef __cplusplus
 extern "C" {