ed

commit d07cc6e6353a8a76e5fcf9e7a81e757d165bf383
parent b442fd4df7588d5441d9efb9aa334d6edb192cdc
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Thu, 10 Dec 2015 22:10:12 +0100

Fix relative addressing

Ed accepts address in the form addr-num, addr+num and addr^num,
where ^ has the same meaning that - (this is a historical
behaviour not required by POSIX), but the code was inverting
the sign of the offset.

Diffstat:
M
ed.c
 | 
7
++++---

1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/ed.c b/ed.c
@@ -384,6 +384,7 @@ linenum(int *line)
 		compile(c);
 		ln = match(c);
 		break;
+	case '^':
 	case '-':
 	case '+':
 		ln = curln;
@@ -411,14 +412,14 @@ address(int *line)
 
 	for (;;) {
 		skipblank();
-		if ((c = input()) != '+' && c != '-')
+		if ((c = input()) != '+' && c != '-' && c != '^')
 			break;
-		sign = c == '+';
+		sign = c == '+' ? 1 : -1;
 		num = isdigit(back(input())) ? getnum() : 1;
 		num *= sign;
 		if (INT_MAX - ln < num)
 			goto invalid;
-		ln += sign * num;
+		ln += num;
 	}
 	back(c);