Загрузить файлы в «src»

src/chroot.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+
+int main(const int argc, const char **argv) {
+
+	if (argc <= 2) {
+		fprintf(stderr, "chroot: missing operand\n");
+		return 1;
+	}
+
+	chroot(argv[1]);
+	chdir("/");
+
+	for (int i = 2; i < argc; i++)
+		system(argv[i]);
+}

src/wc.c

@@ -0,0 +1,115 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+
+/* cmd arguments l - lines c - bytes w - words */
+unsigned int l_flag;
+unsigned int c_flag;
+unsigned int w_flag;
+
+unsigned int words;
+unsigned int bytes;
+unsigned int lines;
+
+/* Total */
+unsigned int twords;
+unsigned int tbytes;
+unsigned int tlines;
+
+void count(const int fd) {
+	char buf[4096];
+	ssize_t n = 0;
+
+	int in_word = 1;
+	while ((n = read(fd, buf, sizeof(buf))) > 0) {
+		bytes += n;
+
+		for (ssize_t i = 0; i < n; i++) {
+			if (buf[i] == '\n')
+				lines++;
+
+			if (buf[i] == ' ' || buf[i] - '\t' < 5) {
+				if (!in_word) {
+					in_word = 1;
+					words++;
+				}
+			}
+
+			else
+				in_word = 0;
+		}
+	}
+
+	tbytes += bytes;
+	twords += words;
+	tlines += lines;
+}
+
+void print_count(const char *path, unsigned int plines, unsigned int pwords, unsigned int pbytes) {
+	if (l_flag)
+		printf("%u ", plines);
+
+	if (w_flag)
+		printf("%u ", pwords);
+
+	if (c_flag)
+		printf("%u", pbytes);
+
+	printf(" %s\n", path);
+}
+
+int main(const int argc, const char **argv) {
+	int i;
+	for (i = 1; i < argc; i++) {
+		if (argv[i][0] != '-')
+			break;
+
+		else if (!strcmp(argv[i], "-l"))
+			l_flag = 1;
+
+		else if (!strcmp(argv[i], "-c"))
+			c_flag = 1;
+
+		else if (!strcmp(argv[i], "-w"))
+			w_flag = 1;
+
+		else if (!strcmp(argv[i], "-h")) {
+			fprintf(stderr, "wc [-l (lines)] [-c (bytes)] [-w (words)] [file1 file2...]\n");
+			return 0;
+		}
+	}
+
+
+	if (!w_flag && !l_flag && !c_flag) {
+		w_flag = 1;
+		l_flag = 1;
+		c_flag = 1;
+	}
+
+	if (i == argc) {
+		count(STDIN_FILENO);
+		print_count("total", tlines, twords, tbytes);
+	}
+
+	for (; i < argc; i++) {
+		int fd = open(argv[i], O_RDONLY);
+		if (fd < 0) {
+			fprintf(stderr, "wc: %s\n", strerror(errno));
+			return 1;
+		}
+
+		count(fd);
+		if (i == argc - 1)
+			print_count("total", tlines, twords, tbytes);
+
+		else
+			print_count(argv[i], lines, words, bytes);
+
+		close(fd);
+		words = bytes = lines = 0;
+	}
+
+	return 0;
+}