documentation: trivial whitespace cleanups

diff --git a/builtin/apply.c b/builtin/apply.c
index 06f5320b18bc5690ae944a722d19ec5496687228..30eefc3c7b390800e9452a06da18208d2fef4f11 100644 (file)
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -1921,7 +1921,7 @@ static int parse_binary(char *buffer, unsigned long size, struct patch *patch)
 }
 
 /*
- * Read the patch text in "buffer" taht extends for "size" bytes; stop
+ * Read the patch text in "buffer" that extends for "size" bytes; stop
  * reading after seeing a single patch (i.e. changes to a single file).
  * Create fragments (i.e. patch hunks) and hang them to the given patch.
  * Return the number of bytes consumed, so that the caller can call us
@@ -2117,10 +2117,10 @@ static void update_pre_post_images(struct image *preimage,
 
        /*
         * Adjust the common context lines in postimage. This can be
-        * done in-place when we are just doing whitespace fixing,
-        * which does not make the string grow, but needs a new buffer
-        * when ignoring whitespace causes the update, since in this case
-        * we could have e.g. tabs converted to multiple spaces.
+        * done in-place when we are shrinking it with whitespace
+        * fixing, but needs a new buffer when ignoring whitespace or
+        * expanding leading tabs to spaces.
+        *
         * We trust the caller to tell us if the update can be done
         * in place (postlen==0) or not.
         */
@@ -2185,7 +2185,7 @@ static int match_fragment(struct image *img,
        int i;
        char *fixed_buf, *buf, *orig, *target;
        struct strbuf fixed;
-       size_t fixed_len;
+       size_t fixed_len, postlen;
        int preimage_limit;
 
        if (preimage->nr + try_lno <= img->nr) {
@@ -2335,6 +2335,7 @@ static int match_fragment(struct image *img,
        strbuf_init(&fixed, preimage->len + 1);
        orig = preimage->buf;
        target = img->buf + try;
+       postlen = 0;
        for (i = 0; i < preimage_limit; i++) {
                size_t oldlen = preimage->line[i].len;
                size_t tgtlen = img->line[try_lno + i].len;
@@ -2362,6 +2363,7 @@ static int match_fragment(struct image *img,
                match = (tgtfix.len == fixed.len - fixstart &&
                         !memcmp(tgtfix.buf, fixed.buf + fixstart,
                                             fixed.len - fixstart));
+               postlen += tgtfix.len;
 
                strbuf_release(&tgtfix);
                if (!match)
@@ -2399,8 +2401,10 @@ static int match_fragment(struct image *img,
         * hunk match.  Update the context lines in the postimage.
         */
        fixed_buf = strbuf_detach(&fixed, &fixed_len);
+       if (postlen < postimage->len)
+               postlen = 0;
        update_pre_post_images(preimage, postimage,
-                              fixed_buf, fixed_len, 0);
+                              fixed_buf, fixed_len, postlen);
        return 1;
 
  unmatch_exit:
@@ -3025,7 +3029,7 @@ static struct patch *in_fn_table(const char *name)
  *
  * The latter is needed to deal with a case where two paths A and B
  * are swapped by first renaming A to B and then renaming B to A;
- * moving A to B should not be prevented due to presense of B as we
+ * moving A to B should not be prevented due to presence of B as we
  * will remove it in a later patch.
  */
 #define PATH_TO_BE_DELETED ((struct patch *) -2)
@@ -3509,7 +3513,7 @@ static int check_patch(struct patch *patch)
         *
         * A patch to swap-rename between A and B would first rename A
         * to B and then rename B to A.  While applying the first one,
-        * the presense of B should not stop A from getting renamed to
+        * the presence of B should not stop A from getting renamed to
         * B; ask to_be_deleted() about the later rename.  Removal of
         * B and rename from A to B is handled the same way by asking
         * was_deleted().