Add misc funcs dealing with time and strings.

Makefile

@@ -5,7 +5,7 @@ CFLAGS = -ggdb -Wall -Wextra -Wshadow -Wformat-security -O2
 RM = /bin/rm -f
 Q=@
 
-OBJS = queue.o list.o io.o log.o http_response.o asyncdns.o server.o
+OBJS = queue.o list.o io.o log.o http_response.o asyncdns.o server.o misc.o
 PROG = libfuncs.a
 
 all: $(PROG)

libfuncs.h

@@ -38,5 +38,6 @@
 #include "log.h"
 #include "queue.h"
 #include "server.h"
+#include "misc.h"
 
 #endif

misc.c

@@ -0,0 +1,38 @@
+#include <sys/time.h>
+#include <string.h>
+#include <errno.h>
+
+int xstrcmp(char *a, char *b) {
+	if (!a && b) return 1;
+	if (!b && a) return 1;
+	if (a == b) return 0;
+	return strcmp(a, b);
+}
+
+unsigned long long timediff_nsec(struct timespec *start_ts, struct timespec *end_ts) {
+	unsigned long long nsec;
+	nsec = (end_ts->tv_sec - start_ts->tv_sec) * 1000000000;
+	nsec += (end_ts->tv_nsec - start_ts->tv_nsec);
+	return nsec;
+}
+
+unsigned long long timeval_diff_usec(struct timeval *start_ts, struct timeval *end_ts) {
+	unsigned long long usec;
+	usec = (end_ts->tv_sec - start_ts->tv_sec) * 1000000;
+	usec += (end_ts->tv_usec - start_ts->tv_usec);
+	return usec;
+}
+
+unsigned long long timeval_diff_msec(struct timeval *start_ts, struct timeval *end_ts) {
+	unsigned long long msec;
+	msec = (end_ts->tv_sec - start_ts->tv_sec) * 1000;
+	msec += (end_ts->tv_usec - start_ts->tv_usec) / 1000;
+	return msec;
+}
+
+unsigned long long timeval_diff_sec(struct timeval *start_ts, struct timeval *end_ts) {
+	unsigned long long sec;
+	sec = (end_ts->tv_sec - start_ts->tv_sec);
+	sec += (end_ts->tv_usec - start_ts->tv_usec) / 1000000;
+	return sec;
+}

misc.h

@@ -0,0 +1,13 @@
+#ifndef MISC_H
+#define MISC_H
+
+#include <sys/time.h>
+
+int xstrcmp(char *a, char *b);
+
+unsigned long long timediff_nsec(struct timespec *start_ts, struct timespec *end_ts);
+unsigned long long timeval_diff_usec(struct timeval *start_ts, struct timeval *end_ts);
+unsigned long long timeval_diff_msec(struct timeval *start_ts, struct timeval *end_ts);
+unsigned long long timeval_diff_sec (struct timeval *start_ts, struct timeval *end_ts);
+
+#endif