From 540b9929adbd816c8134e622e74cc57e478a0f91 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Mon, 5 Aug 2019 10:30:23 -0400
Subject: rewrite to byte-at-a-time

---
 asa.c | 69 +++++++++++++++++++++++++++++++++++++------------------------------
 1 file changed, 38 insertions(+), 31 deletions(-)

diff --git a/asa.c b/asa.c
index 08451d2..f45beb5 100644
--- a/asa.c
+++ b/asa.c
@@ -22,7 +22,7 @@
  * SOFTWARE.
  */
 
-#define _XOPEN_SOURCE 700
+#define _POSIX_C_SOURCE 2
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
@@ -41,41 +41,48 @@ int asa(const char *path)
 		return 1;
 	}
 
-	while (!feof(f)) {
-		char *line = NULL;
-		size_t n = 0;
-
-		if (getline(&line, &n, f) == -1) {
-			if (ferror(f)) {
-				fprintf(stderr, "asa: Couldn't open %s: %s\n", path ? path : "stdin", strerror(errno));
-				return 1;
-			}
-			if (line) {
-				free(line);
+	int c;
+	int newline = -1;
+	while ((c = fgetc(f)) != EOF) {
+		if (newline != 0) {
+			switch (c) {
+			case '0':
+				c = '\n';
+				break;
+
+			case '1':
+				c = '\f';
+				break;
+
+			case '+':
+				c = '\r';
+				newline = 0;
+				break;
+
+			case ' ':
+			default:
+				c = ' ';
+				break;
 			}
-			continue;
-		}
-
-		switch(line[0]) {
-		case '0':
-			putchar('\n');
-			break;
 
-		case '1':
-			putchar('\f');
-			break;
-
-		case '+':
-			putchar('\r');
-			break;
+			if (newline == 1) {
+				putchar('\n');
+			}
 
-		case ' ':
-		default:
-			break;
+			if (c != ' ') {
+				putchar(c);
+			}
+			newline = 0;
+		} else if (c == '\n') {
+			newline = 1;
+		} else {
+			newline = 0;
+			putchar(c);
 		}
+	}
 
-		fputs(line + 1, stdout);
-		free(line);
+	if (newline == 1) {
+		putchar('\n');
 	}
 
 	if (f != stdin) {
-- 
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