vi: fix FEATURE_VI_REGEX_SEARCH to respect LIMITED (one-line) search

If busybox is compiled with FEATURE_VI_REGEX_SEARCH enabled, command
":s/x/y/" searches not only in the current line, but continues search
after it. This makes range searches (":1,3s/x/y/") work incorrect. For
example file "./test":
1
2
3

$ vi ./test
:1,2s/3/e/
gives us:
1
2
e

function                                             old     new   delta
char_search                                          213     241     +28

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

1 files changed, 10 insertions, 5 deletions

diff --git a/editors/vi.c b/editors/vi.c
index 2aa0ad9dd..bff47250d 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -255,8 +255,8 @@ enum {
         YANKDEL = TRUE,
         FORWARD = 1,    // code depends on "1"  for array index
         BACK = -1,      // code depends on "-1" for array index
-        LIMITED = 0,    // how much of text[] in char_search
-        FULL = 1,       // how much of text[] in char_search
+        LIMITED = 0,    // char_search() only current line
+        FULL = 1,       // char_search() to the end/beginning of entire text
 
         S_BEFORE_WS = 1,        // used in skip_thing() for moving "dot"
         S_TO_WS = 2,            // used in skip_thing() for moving "dot"
@@ -1914,10 +1914,15 @@ static char *char_search(char *p, const char *pat, int dir, int range)
                 return p;
         }
 
-        // assume a LIMITED forward search
-        q = end - 1;
-        if (dir == BACK)
+        q = end - 1; // if FULL
+        if (range == LIMITED)
+                q = next_line(p);
+        if (dir == BACK) {
                 q = text;
+                if (range == LIMITED)
+                        q = prev_line(p);
+        }
+
         // RANGE could be negative if we are searching backwards
         range = q - p;
         q = p;