From 512239c77a63779649ee4a996e83f52f7f3b7a46 Mon Sep 17 00:00:00 2001
From: Elias Fleckenstein <eliasfleckenstein@web.de>
Date: Mon, 23 May 2022 22:54:19 +0200
Subject: Initial commit

---
 center.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 center.c

(limited to 'center.c')

diff --git a/center.c b/center.c
new file mode 100644
index 0000000..e6f13b6
--- /dev/null
+++ b/center.c
@@ -0,0 +1,53 @@
+#define _POSIX_C_SOURCE 200809L
+#define _XOPEN_SOURCE
+#include <stdio.h>
+#include <wchar.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <locale.h>
+
+#define ERR(str) { perror(str); err = EXIT_FAILURE; break; }
+
+int main()
+{
+	if (setlocale(LC_ALL, "") == NULL) {
+		perror("setlocale");
+		exit(EXIT_FAILURE);
+	}
+
+	char *ptr = NULL;
+	size_t siz = 0;
+	ssize_t slen;
+	int err = EXIT_SUCCESS;
+
+	while ((slen = getline(&ptr, &siz, stdin)) > 0) {
+		ptr[slen - 1] = '\0';
+	
+		size_t len = mbstowcs(NULL, ptr, 0);
+		if (len == (size_t) -1) ERR("msbtowcs")
+
+		wchar_t *wcs = calloc(len + 1, sizeof *wcs);
+		if (!wcs) ERR("calloc")
+
+		if (mbstowcs(wcs, ptr, len + 1) == (size_t) -1) ERR("msbtowcs")
+
+		struct winsize ws;
+		if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0) ERR("ioctl")
+
+		int trm_width = ws.ws_col;
+		int str_width = wcswidth(wcs, len);
+
+		free(wcs);
+
+		for (int i = (trm_width - str_width) / 2; i > 0; i--)
+			putchar(' ');
+		puts(ptr);
+	}
+
+	if (ptr)
+		free(ptr);
+
+	return err;
+}
-- 
cgit v1.2.3