gmtime

c/time_t_2038/Makefile

@@ -0,0 +1,102 @@
+# This file is generated with smake.sh.
+# You can use this make file with instruction make to
+# use one of build mode: debug, profile, develop, release.
+# No need to call make clean if You make with other mode,
+# because the Makefile containes rules for automatically clean.
+# Some usage examples:
+# make # default mode is debug
+# CFLAGS="-O2 -march=core2 -mtune=core2 --msse4.1 mfpmath=sse -fomit-frame-pointer -pipe" LDFLAGS="-Wl,-O1 -Wl,-ass-needed" make mode=develop
+# CFLAGS="-O2 -march=amdfam10 -mtune=amdfam10 -msse4a --mfpmath=sse -fomit-frame-pointer -pipe" LDFLAGS="-Wl,-O1 -Wl,--as-needed" make mode=profile
+# CFLAGS="-O2 -march=k6-2 -mtune=k6-2 -m3dnow --mfpmath=387 -fomit-frame-pointer -pipe" LDFLAGS="-Wl,-O1 -Wl,--as-needed" make mode=release
+# Report bugs to <mecareful@gmail.com>
+
+#_________________________________
+#          ENVIRONMENT           |
+#________________________________|
+CC=cc
+CXX=c++
+LIBRARIES=
+TARGET0=gmtime
+TARGET= $(TARGET0)
+INCLUDE1=$(HOME)/projects/include
+INCLUDE2=/usr/local/include
+INCLUDE=-I$(INCLUDE1) -I$(INCLUDE2)
+
+#________________________________________
+#      BUILD SCRIPT (don't change)      |
+#_______________________________________|
+ifeq ($(mode),)
+	mode = debug
+endif
+ifeq ($(mode),debug)
+	CFLAGS := -O0 -g -std=gnu99 -pedantic -Wextra -Wconversion $(CFLAGS)
+	LDFLAGS := $(LDFLAGS)
+endif
+ifeq ($(mode),profile)
+	CFLAGS := -O0 -g -p -ftest-coverage -Wcoverage-mismatch $(CFLAGS)
+	LDFLAGS := -g -p $(LDFLAGS)
+endif
+ifeq ($(mode),develop)
+	CFLAGS := -O2 -g $(CFLAGS)
+	LDFLAGS := -O1 $(LDFLAGS)
+endif
+ifeq ($(mode),release)
+	CFLAGS := -O2 $(CFLAGS)
+	LDFLAGS := -O1 $(LDFLAGS)
+endif
+
+CFLAGS += -Wall
+LDFLAGS += -Wall $(LIBRARIES)
+
+all: change_make_options $(TARGET)
+
+ifneq ($(mode),debug)
+ifneq ($(mode),profile)
+ifneq ($(mode),develop)
+ifneq ($(mode),release)
+	@echo "Invalid build mode."
+	@echo "Please use 'make mode=release', 'make mode=develop', 'make mode=profile' or 'make mode=debug'"
+	@exit 1
+endif
+endif
+endif
+endif
+	@echo ".........................."
+	@echo "Building on "$(mode)" mode "
+	@echo "CFLAGS=$(CFLAGS)"
+	@echo "LDFLAGS=$(LDFLAGS)"
+	@echo ".........................."
+
+OLD_BUILD_MODE=$(shell grep ^MODE make_options.out 2>/dev/null | sed 's~^MODE=~~')
+OLD_BUILD_CFLAGS=$(shell grep ^CFLAGS make_options.out 2>/dev/null | sed 's~^CFLAGS=~~')
+OLD_BUILD_LDFLAGS=$(shell grep ^LDFLAGS make_options.out 2>/dev/null | sed 's~^LDFLAGS=~~')
+change_make_options:
+ifneq ($(mode)|$(CFLAGS)|$(LDFLAGS), $(OLD_BUILD_MODE)|$(OLD_BUILD_CFLAGS)|$(OLD_BUILD_LDFLAGS))
+	@echo CLEANING...
+	@make clean &>/dev/null
+	@echo "MODE=$(mode)" > make_options.out
+	@echo "CFLAGS=$(CFLAGS)" >> make_options.out
+	@echo "LDFLAGS=$(LDFLAGS)" >> make_options.out
+endif
+
+%.o :
+	$(CC) -c $(CFLAGS) $(INCLUDE) -o $@ $<
+
+clean:
+	$(RM) *.o *.out callgrind.out.* *.gcno $(TARGET)
+
+.PHONY: all change_make_options clean
+
+#_________________________________
+#           R U L E S            |
+#________________________________|
+target_objs0 = \
+	gmtime.o
+
+$(TARGET0): $(target_objs0)
+	$(CC) $(LDFLAGS) -o $@ $(target_objs0)
+
+
+gmtime.o: \
+	gmtime.c
+

c/time_t_2038/gmtime.c

@@ -0,0 +1,33 @@
+#define _XOPEN_SOURCE
+
+#include <time.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+	struct tm t, *tp = NULL;
+	time_t tt;
+	char outstr[200];
+
+	putenv("TZ=Europe/Moscow");
+
+	t.tm_sec = 1;
+	t.tm_min = 2;
+	t.tm_hour = 3;
+	t.tm_mday = 4;
+	t.tm_mon = 5;
+	t.tm_year = 0;
+	t.tm_isdst = 0;
+	
+	tt = mktime(&t);
+
+	tp = gmtime(&tt);
+
+	if (strftime(outstr, sizeof(outstr), "%Y.%m.%d", tp) != 0)
+		printf("%s\n", outstr);
+
+	printf("%d\n", sizeof(time_t));
+	return 0;
+}
+