From af7821da81932a990ecc64a6381a90f3d6eaf5d2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Mon, 12 Jul 2021 17:30:47 +0200
Subject: ce: Rewrite in C

The `build' program is available at
   http://git.ankarstrom.se/build/
---
 etc/ce   | 28 ----------------------------
 etc/ce.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 28 deletions(-)
 delete mode 100755 etc/ce
 create mode 100644 etc/ce.c

(limited to 'etc')

diff --git a/etc/ce b/etc/ce
deleted file mode 100755
index c00d1bf..0000000
--- a/etc/ce
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/bin/sh
-
-# ce -- center text
-
-usage() { echo usage: $0 [cols] 1>&2; exit 1; }
-
-[ $# -gt 1 ] && usage
-
-if [ $# -eq 1 ]; then
-	cols=${1#-}
-	[ "$cols" -gt 0 ] || usage
-	shift
-else
-	cols=`tput cols`
-	[ "$cols" -le 80 ] || cols=80
-fi
-
-while read line; do
-	line=${line## }
-	line=${line%% }
-	len=`echo "$line" | wc -c`
-	max=$(((cols - len) / 2))
-	i=0
-	while [ $((i++)) -lt $max ]; do
-		printf ' '
-	done
-	echo "$line"
-done
diff --git a/etc/ce.c b/etc/ce.c
new file mode 100644
index 0000000..c8981bd
--- /dev/null
+++ b/etc/ce.c
@@ -0,0 +1,44 @@
+/*
+ *  ce -- center text
+ *  $ cc -O2 -o ce ce.c
+ */
+
+#include <err.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAXBUF 255
+
+int
+main(int argc, char *argv[])
+{
+	char *buf;
+	int cols, i, max;
+
+	if(argc-1 > 1){
+		fprintf(stderr, "usage: %s [cols]\n", argv[0]);
+		return 1;
+	}
+	cols = argv[1] ? atoi(argv[1]) : 80;
+
+	if(!(buf = malloc(MAXBUF)))
+		err(1, "malloc");
+
+	while(fgets(buf, MAXBUF, stdin)){
+		buf[strcspn(buf, "\n")] = 0;
+
+		/* Remove leading and trailing whitespace. */
+		for (; *buf; buf++)
+			if(!isspace(*buf)) break;
+		for (i = strlen(buf)-1; i >= 0; i--)
+			if(!isspace(buf[i])) break;
+		buf[i+1] = 0;
+
+		/* Calculate number of spaces. */
+		max = cols/2 + strlen(buf)/2;
+
+		printf("%*s\n", max, buf);
+	}
+}
-- 
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