time and seq added

TODO

@@ -34,6 +34,7 @@ Other:
  free
  swapon
  swapoff
+ hexdump
 
 Loginutils:
  su

src/coreutils/seq/build.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+echo ./*.c $CFLAGS $OUTPUT | xargs $CC

src/coreutils/seq/seq.c

@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+double parse_double(const char *str) {
+	char *ptr;
+
+	double res = strtod(str, &ptr);
+	if (*ptr) {
+		fprintf(stderr, "seq: %s: cant parse\n", ptr);
+                exit(1);
+	}
+
+        return res;
+}
+
+int main(int argc, char **argv) {
+	double start = 1;
+	double last = 0;
+	double n = 1;
+
+	argv++;
+	argc--;
+
+	switch (argc) {
+		case 1:
+			last = parse_double(argv[0]);
+			break;
+
+		case 2:
+			start = parse_double(argv[0]);
+			last = parse_double(argv[1]);
+			break;
+
+		case 3:
+			n = parse_double(argv[1]);
+			start = parse_double(argv[0]);
+			last = parse_double(argv[2]);
+			break;
+
+		default:
+			fprintf(stderr, "seq: missing operands\n");
+			return 1;
+	}
+
+	if (start <= last && n >= 0) {
+		for (double i = start; i <= last; i += n)
+			printf("%.*f\n", i);
+	}
+
+	else if (n <= 0)
+		for (double i = start; i >= last; i += n)
+			printf("%.*f\n", i);
+
+	return 0;
+}

src/coreutils/time/build.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+echo ./*.c $CFLAGS $OUTPUT | xargs $CC

src/coreutils/time/time.c

@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <sys/times.h>
+
+int main(int argc, char **argv) {
+	if (argc < 2) {
+		fprintf(stderr, "time: missing operand\n");
+		return 1;
+	}
+
+	/* Get time */
+	struct tms t1, t2;
+	long ticks = sysconf(_SC_CLK_TCK);
+	if (ticks <= 0) {
+		fprintf(stderr, "time: %s\n", strerror(errno));
+		return 1;
+	}
+
+	clock_t r1 = times(&t1);
+	if (r1 == (clock_t)-1) {
+		fprintf(stderr, "time: %s\n", strerror(errno));
+		return 1;
+	}
+
+	/* Run */
+	pid_t pid;
+	if ((pid = fork()) == 0)
+		execvp(argv[1], argv + 1);
+
+	int status = 0;
+	waitpid(pid, &status, 0);
+
+	/* Get time */
+	clock_t r2 = times(&t1);
+	if (r2 == (clock_t)-1) {
+		fprintf(stderr, "time: %s\n", strerror(errno));
+		return 1;
+	}
+
+
+	/* Print */
+	fprintf(stderr, "real  %.4f\nuser  %.4f\nsys  %.4f\n", (r2 - r1) / (double)ticks, t1.tms_cutime / (double)ticks, t2.tms_cstime / (double)ticks);
+	if (status != 0)
+		printf("Proccess returned %d\n", status);
+
+	return 0;
+}

src/sysutils-linux/pivot_root/build.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+echo ./*.c $CFLAGS $OUTPUT | xargs $CC

src/sysutils-linux/pivot_root/pivot_root.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+int main(int argc, char **argv) {
+	if (argc < 2) {
+		printf("pivot_root [new-root] [put-old]\n");
+		return 0;
+	}
+
+	if (syscall(SYS_pivot_root, argv[0], argv[1]) < 0) {
+		fprintf(stderr, "pivot_root: %s\n", strerror(errno));
+		return 1;
+	}
+
+	return 0;
+}