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subtract 'a' from indices for marks

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Given:

static int marks['z' - 'a'];
marks[c];

In this case c is the character read and index is out of bounds. We
need marks[c - 'a']

While playing around with optimization settings gcc caught caught this.

Also fix one check for c, change from isalpha to islower.

-emg

From 2cc36818283e9068576c1042690c016a81b709a3 Mon Sep 17 00:00:00 2001
From: Evan Gates <evan.gates@gmail.com>
Date: Fri, 15 Jul 2016 09:52:39 -0700
Subject: [PATCH] fix marks indexing
This commit is contained in:
Evan Gates 2016-07-15 09:57:50 -07:00 committed by sin
parent 3c12b287ec
commit e3f497e1f6
1 changed files with 3 additions and 3 deletions
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6
ed.c
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@ -478,9 +478,9 @@ linenum(int *line)
break;
case '\'':
skipblank();
if (!isalpha(c = input()))
if (!islower(c = input()))
error("invalid mark character");
if (!(ln = marks[c]))
if (!(ln = marks[c - 'a']))
error("invalid address");
break;
case '$':
@ -1191,7 +1191,7 @@ repeat:
error("invalid mark character");
chkprint(1);
deflines(curln, curln);
marks[c] = line1;
marks[c - 'a'] = line1;
break;
case 'P':
if (nlines > 0)