vi: fix '' command (goto to prev context)

The '' command in vi doesn't currently work because after the first
apostrophe is read, the next character is converted to an integer
between 0 and 25 inclusive (for indexing the array of marks). The
comparison of the converted character with an apostrophe therefore never
succeeds, meaning that '' doesn't do anything.

Based on the patch by Francis Rounds <francis.rounds@4bridgeworks.com>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/editors/vi.c b/editors/vi.c
index c142dacd7..38a4692fd 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -2722,9 +2722,8 @@ static char *swap_context(char *p) // goto new context for '' command make this
         // only swap context if other context is valid
         if (text <= mark[27] && mark[27] <= end - 1) {
                 tmp = mark[27];
-                mark[27] = mark[26];
-                mark[26] = tmp;
-                p = mark[26];   // where we are going- previous context
+                mark[27] = p;
+                mark[26] = p = tmp;
                 context_start = prev_line(prev_line(prev_line(p)));
                 context_end = next_line(next_line(next_line(p)));
         }
@@ -3618,8 +3617,9 @@ static void do_cmd(int c)
                 }
                 break;
         case '\'':                      // '- goto a specific mark
-                c1 = (get_one_char() | 0x20) - 'a';
-                if ((unsigned)c1 <= 25) { // a-z?
+                c1 = (get_one_char() | 0x20);
+                if ((unsigned)(c1 - 'a') <= 25) { // a-z?
+                        c1 = (c1 - 'a');
                         // get the b-o-l
                         q = mark[c1];
                         if (text <= q && q < end) {