time Utility for working with time/dates

user/time/.gitignore

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+*.o
+time

user/time/Makefile

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+include $(ROOT)/mk/grabsrc.mk
+include ../Makefile.inc
+
+.PHONY: all clean
+
+TARGET := time
+
+LDFLAGS += -L$(ROOT)/ulib -l:libulib.a
+
+SRCFILES := $(call GRABSRC, .)
+CFILES := $(call GET_CFILES, $(SRCFILES))
+OBJ := $(call GET_OBJ, $(SRCFILES))
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ)
+	$(LD) $^ $(LDFLAGS) -o $@
+	echo $$(realpath $(TARGET)) >> $(FILES)
+
+clean:
+	rm -f $(OBJ) $(TARGET)

user/time/main.c

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+#include <stdint.h>
+#include <stddef.h>
+#include <ulib.h>
+
+#define CMDS(X)                     \
+  X(now)
+
+void main(void) {
+  if (argslen() == 0) {
+    return;
+  }
+
+  char *cmd = args()[0];
+
+  #define X(name) if (string_strcmp(cmd, #name) == 0) { \
+    extern void tm_ ## name(void); \
+    tm_ ## name(); \
+    return; \
+  }
+  CMDS(X)
+  #undef X
+
+  uprintf("time: unknown command %s\n", cmd);
+}

user/time/now.c

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+#include <stdint.h>
+#include <stddef.h>
+#include <ulib.h>
+
+struct {
+  char *format;
+} TM_NOW_CONFIG = {0};
+
+static Arg ARGS[] = {
+  ARG("-fmt", ARG_STRING, &TM_NOW_CONFIG.format),
+  ARG_END(),
+};
+
+void tm_now(void) {
+  int32_t ret;
+  if ((ret = parse_args(args()+1, argslen()-1, ARGS)) < 0) {
+    uprintf("time: could not parse args: %d\n", ret);
+    return;
+  }
+
+  Time tmbuf;
+  time(&tmbuf);
+
+  if (TM_NOW_CONFIG.format == NULL) {
+    uprintf("%02u/%02u/%02u %02u:%02u:%02u\n",
+      tmbuf.day, tmbuf.month, tmbuf.year,
+      tmbuf.hour, tmbuf.minute, tmbuf.second
+    );
+    return;
+  }
+
+  if (string_strcmp(TM_NOW_CONFIG.format, "unix") == 0) {
+    timeunix_t unix = time_tounix(&tmbuf);
+    uprintf("%lu\n", unix);
+  } else {
+    uprintf("time: unknown format %s\n", TM_NOW_CONFIG.format);
+  }
+}