Merge branch 'master' of https://github.com/EliteTK/c-stuff

4 files changed, 203 insertions, 10 deletions

diff --git a/nkey.c b/nkey.c
new file mode 100644
index 0000000..de92d66
--- /dev/null
+++ b/nkey.c
@@ -0,0 +1,51 @@
+#include <ncurses.h>
+#include <stdio.h>
+
+int getch_nodelay(void)
+{
+	int retval;
+
+	nodelay(stdscr, TRUE);
+	retval = getch();
+	nodelay(stdscr, FALSE);
+
+	return retval;
+}
+
+int main(void)
+{
+	cbreak();
+	initscr();
+	noecho();
+	nonl();
+
+	keypad(stdscr, TRUE);
+
+	while (1) {
+		char number[32];
+		int c[5] = {
+			getch(),
+			getch_nodelay(),
+			getch_nodelay(),
+			getch_nodelay(),
+			getch_nodelay()
+		};
+
+		if (c[1] == ERR)
+			snprintf(number, 32, "%d ", c[0]);
+		else if (c[2] == ERR)
+			snprintf(number, 32, "%d-%d ", c[0], c[1]);
+		else if (c[3] == ERR)
+			snprintf(number, 32, "%d-%d-%d ", c[0], c[1], c[2]);
+		else if (c[4] == ERR)
+			snprintf(number, 32, "%d-%d-%d-%d ", c[0], c[1], c[2],
+					c[3]);
+		else if (c[5] == ERR)
+			snprintf(number, 32, "%d-%d-%d-%d-%d ", c[0], c[1],
+					c[2], c[3], c[4]);
+
+		addstr(number);
+	}
+
+	return 0;
+}
diff --git a/similarity.c b/similarity.c
new file mode 100644
index 0000000..b1fbd06
--- /dev/null
+++ b/similarity.c
@@ -0,0 +1,44 @@
+#include <errno.h>
+#include <error.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char **argv)
+{
+	unsigned long matches = 0, misses = 0;
+	char *strings[2];
+	size_t lengths[2];
+	size_t pos[2] = {0};
+	unsigned current = 0;
+
+	if (argc != 3)
+		error(1, 0, "Incorrect number of arguments %d", argc);
+
+	strings[0] = argv[1];
+	lengths[0] = strlen(strings[0]);
+	strings[1] = argv[2];
+	lengths[1] = strlen(strings[1]);
+
+	for (; pos[0] < lengths[0] && pos[1] < lengths[1];) {
+		if (strings[0][pos[0]] == strings[1][pos[1]]) {
+			matches++;
+			pos[0]++;
+			pos[1]++;
+			current = current ? 0 : 1;
+		} else {
+			pos[current ? 0 : 1]++;
+			misses++;
+		}
+	}
+
+	if (lengths[0] > pos[0])
+		misses += lengths[0] - pos[0] - 1;
+
+	if (lengths[1] > pos[1])
+		misses += lengths[1] - pos[1] - 1;
+
+	printf("Matches: %lu, Misses: %lu\n", matches, misses);
+
+	return 0;
+}
diff --git a/time_diff.c b/time_diff.c
new file mode 100644
index 0000000..726a6cd
--- /dev/null
+++ b/time_diff.c
@@ -0,0 +1,60 @@
+#include <errno.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+const char *progname;
+
+inline uint64_t get_time_ms(void)
+{
+	struct timespec timespec;
+	static const uint64_t invmil = 1 / 1000000;
+
+	if (clock_gettime(CLOCK_MONOTONIC, &timespec) != 0) {
+		fprintf(stderr, "%s: Unable to get time delta: %s\n",
+				progname, strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	return timespec.tv_sec * 1000 + timespec.tv_nsec * invmil;
+}
+
+uint64_t get_delta(void)
+{
+	static uint64_t oldtime = 0;
+	uint64_t timediff, newtime;
+
+	newtime = get_time_ms();
+
+	timediff = newtime - oldtime;
+
+	oldtime = newtime;
+
+	return timediff;
+}
+
+int main(int argc, char **argv)
+{
+	struct {
+		int a;
+		char b;
+	} teststruct = {1, 2};
+
+	uint64_t buildup = 0, count = 0;
+
+	progname = argc != 0 && argv[0] != NULL ? argv[0] : "";
+
+	get_delta();
+
+	while (true) {
+		for (buildup += get_delta(); buildup >= 1000; buildup -= 1000)
+			printf("%lu, %lu\n", count++, buildup);
+	}
+
+	printf("%d\n", teststruct.a);
+
+	return 0;
+}
diff --git a/timer.c b/timer.c
index d32c9b1..87c90a3 100644
--- a/timer.c
+++ b/timer.c
@@ -30,6 +30,19 @@
 #define SEC_YEAR   31556940
 
 static const unsigned long interval_nsec = 1000000000 / 4;
+unsigned short term_width = 0; /* Maybe volatile? */
+
+void sigwinch(int sig) {
+	if (sig != SIGWINCH)
+		return;
+
+	struct winsize ws;
+
+	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1)
+		error(1, errno, "Failed to get terminal width");
+
+	term_width = ws.ws_col;
+}
 
 unsigned long int get_seconds(char *code)
 {
@@ -67,15 +80,10 @@ unsigned long int get_seconds(char *code)
 
 void clear_line(void)
 {
-	struct winsize ws;
-
-	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1)
-		error(1, errno, "IOCTL failed");
-
-	if (ws.ws_col <= 1)
+	if (term_width <= 1)
 		return;
 
-	for (unsigned short i = 0; i < ws.ws_col - 1; i++)
+	for (unsigned short i = 0; i < term_width - 1; i++)
 		putchar(' ');
 
 	putchar('\r');
@@ -88,17 +96,39 @@ void clear_line(void)
 void print_time(unsigned long total_sec, bool show_colon)
 {
 	unsigned long years, months, days, hours, minutes, seconds;
-	char colon = show_colon ? ':' : ' ';
+	char colon = show_colon ? ':' : ' ', syears[128], smonths[16],
+	     sdays[16];
 
 	years = total_sec / SEC_YEAR;
 	total_sec %= SEC_YEAR;
 
+	if (years == 1)
+		snprintf(syears, sizeof syears, "%lu year, ", years);
+	else if (years > 1)
+		snprintf(syears, sizeof syears, "%lu years, ", years);
+	else
+		syears[0] = '\0';
+
 	months = total_sec / SEC_MONTH;
 	total_sec %= SEC_MONTH;
 
+	if (months == 1)
+		snprintf(smonths, sizeof smonths, "%lu month, ", months);
+	else if (months > 1)
+		snprintf(smonths, sizeof smonths, "%lu months, ", months);
+	else
+		smonths[0] = '\0';
+
 	days = total_sec / SEC_DAY;
 	total_sec %= SEC_DAY;
 
+	if (days == 1)
+		snprintf(sdays, sizeof sdays, "%lu day, ", days);
+	else if (days > 1)
+		snprintf(sdays, sizeof sdays, "%lu days, ", days);
+	else
+		sdays[0] = '\0';
+
 	hours = total_sec / SEC_HOUR;
 	total_sec %= SEC_HOUR;
 
@@ -111,8 +141,8 @@ void print_time(unsigned long total_sec, bool show_colon)
 	if (total_sec != 0)
 		error(1, 0, "An error occured during time formatting");
 
-	printf(" %luY %luM %luD %.2lu%c%.2lu%c%.2lu\r", years, months,
-			days, hours, colon, minutes, colon, seconds);
+	printf(" %s%s%s%.2lu%c%.2lu%c%.2lu\r", syears, smonths, sdays, hours,
+	       colon, minutes, colon, seconds);
 
 	if (fflush(stdout) != 0)
 		error(1, errno, "Failed to flush stdout");
@@ -130,6 +160,7 @@ int main(int argc, char **argv)
 	sigset_t sigset;
 	struct itimerspec its;
 	struct sigevent sev;
+	struct sigaction sigact;
 	timer_t timerid;
 
 	unsigned long total_seconds = 0;
@@ -143,6 +174,11 @@ int main(int argc, char **argv)
 	for (int i = 1; i < argc; i++)
 		total_seconds += get_seconds(argv[i]);
 
+	sigact.sa_handler = sigwinch;
+
+	if (sigaction(SIGWINCH, &sigact, NULL) != 0)
+		error(1, errno, "Unable to set SIGWINCH signal action");
+
 	sev.sigev_notify = SIGEV_SIGNAL;
 	sev.sigev_signo = SIGRTMIN;
 	sev.sigev_value.sival_ptr = &timerid;
@@ -167,6 +203,8 @@ int main(int argc, char **argv)
 	if (timer_settime(timerid, 0, &its, NULL) != 0)
 		error(1, errno, "Could not set timer");
 
+	sigwinch(SIGWINCH);
+
 	for (unsigned long i = 0; i < total_seconds; i++)
 		for (int ii = 0; ii < 4; ii++) {
 			if (sigwait(&sigset, &sig), sig != SIGRTMIN)