From 9d38bc79ae203a18b43480ecb43e540847d472a3 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Tue, 9 Jun 2020 10:13:23 -0400
Subject: tests: New acceptance test for xtimegm()

---
 .gitignore      |  1 +
 Makefile        | 12 ++++++--
 tests/xtimegm.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 101 insertions(+), 3 deletions(-)
 create mode 100644 tests/xtimegm.c

diff --git a/.gitignore b/.gitignore
index 99776af..c18ddc3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 *.d
 /bfs
 /tests/mksock
+/tests/xtimegm
diff --git a/Makefile b/Makefile
index 7a31d6b..4f4c1e3 100644
--- a/Makefile
+++ b/Makefile
@@ -89,7 +89,7 @@ ALL_LDLIBS = $(LOCAL_LDLIBS) $(LDLIBS)
 
 default: bfs
 
-all: bfs tests/mksock
+all: bfs tests/mksock tests/xtimegm
 
 bfs: \
     bftw.o \
@@ -126,10 +126,16 @@ release: bfs
 tests/mksock: tests/mksock.o
 	$(CC) $(ALL_LDFLAGS) $^ -o $@
 
+tests/xtimegm: time.o tests/xtimegm.o
+	$(CC) $(ALL_LDFLAGS) $^ -o $@
+
 %.o: %.c
 	$(CC) $(ALL_CFLAGS) -c $< -o $@
 
-check: check-bfs check-dfs check-ids
+check: check-xtimegm check-bfs check-dfs check-ids
+
+check-xtimegm: tests/xtimegm
+	$<
 
 check-%: all
 	./tests.sh --bfs="$(CURDIR)/bfs -S $*" $(TEST_FLAGS)
@@ -144,7 +150,7 @@ endif
 	+$(MAKE) -B check $(DISTCHECK_FLAGS)
 
 clean:
-	$(RM) bfs *.[od] tests/mksock tests/*.[od]
+	$(RM) bfs *.[od] tests/mksock tests/xtimegm tests/*.[od]
 
 install:
 	$(MKDIR) $(DESTDIR)$(PREFIX)/bin
diff --git a/tests/xtimegm.c b/tests/xtimegm.c
new file mode 100644
index 0000000..2426815
--- /dev/null
+++ b/tests/xtimegm.c
@@ -0,0 +1,91 @@
+#include "../time.h"
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+static bool tm_equal(const struct tm *tma, const struct tm *tmb) {
+	if (tma->tm_year != tmb->tm_year) {
+		return false;
+	}
+	if (tma->tm_mon != tmb->tm_mon) {
+		return false;
+	}
+	if (tma->tm_mday != tmb->tm_mday) {
+		return false;
+	}
+	if (tma->tm_hour != tmb->tm_hour) {
+		return false;
+	}
+	if (tma->tm_min != tmb->tm_min) {
+		return false;
+	}
+	if (tma->tm_sec != tmb->tm_sec) {
+		return false;
+	}
+	if (tma->tm_wday != tmb->tm_wday) {
+		return false;
+	}
+	if (tma->tm_yday != tmb->tm_yday) {
+		return false;
+	}
+	if (tma->tm_isdst != tmb->tm_isdst) {
+		return false;
+	}
+
+	return true;
+}
+
+static void tm_print(FILE *file, const struct tm *tm) {
+	fprintf(file, "Y%d M%d D%d  h%d m%d s%d  wd%d yd%d%s\n",
+	        tm->tm_year, tm->tm_mon, tm->tm_mday,
+	        tm->tm_hour, tm->tm_min, tm->tm_sec,
+	        tm->tm_wday, tm->tm_yday,
+		tm->tm_isdst ? (tm->tm_isdst < 0 ? " (DST?)" : " (DST)") : "");
+}
+
+int main(void) {
+	if (setenv("TZ", "UTC0", true) != 0) {
+		perror("setenv()");
+		return EXIT_FAILURE;
+	}
+
+	struct tm tm = {
+		.tm_isdst = -1,
+	};
+
+	for (tm.tm_year = 0; tm.tm_year <= 200; tm.tm_year += 10)
+	for (tm.tm_mon = -3; tm.tm_mon <= 15; tm.tm_mon += 3)
+	for (tm.tm_mday = -31; tm.tm_mday <= 61; tm.tm_mday += 4)
+	for (tm.tm_hour = -1; tm.tm_hour <= 24; tm.tm_hour += 5)
+	for (tm.tm_min = -1; tm.tm_min <= 60; tm.tm_min += 31)
+	for (tm.tm_sec = -60; tm.tm_sec <= 120; tm.tm_sec += 5) {
+		struct tm tma = tm, tmb = tm;
+		time_t ta, tb;
+		ta = mktime(&tma);
+		if (xtimegm(&tmb, &tb) != 0) {
+			tb = -1;
+		}
+
+		bool fail = false;
+		if (ta != tb) {
+			printf("Mismatch:  %jd != %jd\n", (intmax_t)ta, (intmax_t)tb);
+			fail = true;
+		}
+		if (ta != -1 && !tm_equal(&tma, &tmb)) {
+			printf("mktime():  ");
+			tm_print(stdout, &tma);
+			printf("xtimegm(): ");
+			tm_print(stdout, &tmb);
+			fail = true;
+		}
+		if (fail) {
+			printf("Input:     ");
+			tm_print(stdout, &tm);
+			return EXIT_FAILURE;
+		}
+	}
+
+	return EXIT_SUCCESS;
+}
-- 
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