Overengineered a program that repeats things in a line

3 files changed, 67 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ad13429
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+nt
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..73f8388
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,18 @@
+CFLAGS=-Wall -Wextra -Wpedantic -O3 -D_POSIX_C_SOURCE=200809L
+
+PREFIX=/usr/local
+BINDIR=$(PREFIX)/bin
+
+all: nt
+
+clean:
+	rm -f nt
+
+install: all
+	install -Dm755 nt -t $(DESTDIR)$(BINDIR)/
+
+uninstall:
+	rm -f $(DESTDIR)$(BINDIR)/nt
+
+.POSIX:
+.PHONY: clean install uninstall
diff --git a/nt.c b/nt.c
new file mode 100644
index 0000000..bc00216
--- /dev/null
+++ b/nt.c
@@ -0,0 +1,48 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+/// Prints *str* *times* to standard output.
+int
+repeat(const int times, const char* str)
+{
+	for (int i = 0; i < times; ++i)
+		printf("%s", str);
+	return printf("\n");
+}
+
+
+/// Concatenates strings from *strv*. User needs to free allocated string.
+char*
+concat(const int strc, const char* strv[])
+{
+	assert(0 < strc);
+	int i;
+	int len = 0;
+	for (i = 0; i < strc; ++i)
+		len += 1 + strlen(strv[i]);
+	char* const str = malloc(len);
+	str[0] = 0;
+	char* ptr = stpcpy(str, strv[0]);
+	for (int i = 1; i < strc; ++i) {
+		*ptr = ' ';
+		*++ptr = 0;
+		ptr = stpcpy(ptr, strv[i]);
+	}
+	return str;
+}
+
+
+int
+main(const int argc, const char* argv[])
+{
+	if (3 > argc)
+		return 1;
+	const int times = atoi(argv[1]);
+	if (1 > times)
+		return 1;
+	const char* str = concat(argc - 2, &argv[2]);
+	return repeat(times, str);
+}