{
int i;
char *fixed_buf, *buf, *orig, *target;
+ int preimage_limit;
- if (preimage->nr + try_lno > img->nr)
+ if (preimage->nr + try_lno <= img->nr) {
+ /*
+ * The hunk falls within the boundaries of img.
+ */
+ preimage_limit = preimage->nr;
+ if (match_end && (preimage->nr + try_lno != img->nr))
+ return 0;
+ } else if (ws_error_action == correct_ws_error &&
+ (ws_rule & WS_BLANK_AT_EOF) && match_end) {
+ /*
+ * This hunk that matches at the end extends beyond
+ * the end of img, and we are removing blank lines
+ * at the end of the file. This many lines from the
+ * beginning of the preimage must match with img, and
+ * the remainder of the preimage must be blank.
+ */
+ preimage_limit = img->nr - try_lno;
+ } else {
+ /*
+ * The hunk extends beyond the end of the img and
+ * we are not removing blanks at the end, so we
+ * should reject the hunk at this position.
+ */
return 0;
+ }
if (match_beginning && try_lno)
return 0;
- if (match_end && preimage->nr + try_lno != img->nr)
- return 0;
-
/* Quick hash check */
- for (i = 0; i < preimage->nr; i++)
+ for (i = 0; i < preimage_limit; i++)
if (preimage->line[i].hash != img->line[try_lno + i].hash)
return 0;
- /*
- * Do we have an exact match? If we were told to match
- * at the end, size must be exactly at try+fragsize,
- * otherwise try+fragsize must be still within the preimage,
- * and either case, the old piece should match the preimage
- * exactly.
- */
- if ((match_end
- ? (try + preimage->len == img->len)
- : (try + preimage->len <= img->len)) &&
- !memcmp(img->buf + try, preimage->buf, preimage->len))
- return 1;
+ if (preimage_limit == preimage->nr) {
+ /*
+ * Do we have an exact match? If we were told to match
+ * at the end, size must be exactly at try+fragsize,
+ * otherwise try+fragsize must be still within the preimage,
+ * and either case, the old piece should match the preimage
+ * exactly.
+ */
+ if ((match_end
+ ? (try + preimage->len == img->len)
+ : (try + preimage->len <= img->len)) &&
+ !memcmp(img->buf + try, preimage->buf, preimage->len))
+ return 1;
+ } else {
+ /*
+ * The preimage extends beyond the end of img, so
+ * there cannot be an exact match.
+ *
+ * There must be one non-blank context line that match
+ * a line before the end of img.
+ */
+ char *buf_end;
+
+ buf = preimage->buf;
+ buf_end = buf;
+ for (i = 0; i < preimage_limit; i++)
+ buf_end += preimage->line[i].len;
+
+ for ( ; buf < buf_end; buf++)
+ if (!isspace(*buf))
+ break;
+ if (buf == buf_end)
+ return 0;
+ }
/*
* No exact match. If we are ignoring whitespace, run a line-by-line
size_t imgoff = 0;
size_t preoff = 0;
size_t postlen = postimage->len;
- for (i = 0; i < preimage->nr; i++) {
+ size_t extra_chars;
+ char *preimage_eof;
+ char *preimage_end;
+ for (i = 0; i < preimage_limit; i++) {
size_t prelen = preimage->line[i].len;
size_t imglen = img->line[try_lno+i].len;
}
/*
- * Ok, the preimage matches with whitespace fuzz. Update it and
- * the common postimage lines to use the same whitespace as the
- * target. imgoff now holds the true length of the target that
- * matches the preimage, and we need to update the line lengths
- * of the preimage to match the target ones.
+ * Ok, the preimage matches with whitespace fuzz.
+ *
+ * imgoff now holds the true length of the target that
+ * matches the preimage before the end of the file.
+ *
+ * Count the number of characters in the preimage that fall
+ * beyond the end of the file and make sure that all of them
+ * are whitespace characters. (This can only happen if
+ * we are removing blank lines at the end of the file.)
*/
- fixed_buf = xmalloc(imgoff);
- memcpy(fixed_buf, img->buf + try, imgoff);
- for (i = 0; i < preimage->nr; i++)
- preimage->line[i].len = img->line[try_lno+i].len;
+ buf = preimage_eof = preimage->buf + preoff;
+ for ( ; i < preimage->nr; i++)
+ preoff += preimage->line[i].len;
+ preimage_end = preimage->buf + preoff;
+ for ( ; buf < preimage_end; buf++)
+ if (!isspace(*buf))
+ return 0;
/*
- * Update the preimage buffer and the postimage context lines.
+ * Update the preimage and the common postimage context
+ * lines to use the same whitespace as the target.
+ * If whitespace is missing in the target (i.e.
+ * if the preimage extends beyond the end of the file),
+ * use the whitespace from the preimage.
*/
+ extra_chars = preimage_end - preimage_eof;
+ fixed_buf = xmalloc(imgoff + extra_chars);
+ memcpy(fixed_buf, img->buf + try, imgoff);
+ memcpy(fixed_buf + imgoff, preimage_eof, extra_chars);
+ imgoff += extra_chars;
update_pre_post_images(preimage, postimage,
fixed_buf, imgoff, postlen);
return 1;
* it might with whitespace fuzz. We haven't been asked to
* ignore whitespace, we were asked to correct whitespace
* errors, so let's try matching after whitespace correction.
+ *
+ * The preimage may extend beyond the end of the file,
+ * but in this loop we will only handle the part of the
+ * preimage that falls within the file.
*/
fixed_buf = xmalloc(preimage->len + 1);
buf = fixed_buf;
orig = preimage->buf;
target = img->buf + try;
- for (i = 0; i < preimage->nr; i++) {
+ for (i = 0; i < preimage_limit; i++) {
size_t fixlen; /* length after fixing the preimage */
size_t oldlen = preimage->line[i].len;
size_t tgtlen = img->line[try_lno + i].len;
target += tgtlen;
}
+
+ /*
+ * Now handle the lines in the preimage that falls beyond the
+ * end of the file (if any). They will only match if they are
+ * empty or only contain whitespace (if WS_BLANK_AT_EOL is
+ * false).
+ */
+ for ( ; i < preimage->nr; i++) {
+ size_t fixlen; /* length after fixing the preimage */
+ size_t oldlen = preimage->line[i].len;
+ int j;
+
+ /* Try fixing the line in the preimage */
+ fixlen = ws_fix_copy(buf, orig, oldlen, ws_rule, NULL);
+
+ for (j = 0; j < fixlen; j++)
+ if (!isspace(buf[j]))
+ goto unmatch_exit;
+
+ orig += oldlen;
+ buf += fixlen;
+ }
+
/*
* Yes, the preimage is based on an older version that still
* has whitespace breakages unfixed, and fixing them makes the
unsigned long backwards, forwards, try;
int backwards_lno, forwards_lno, try_lno;
- if (preimage->nr > img->nr)
- return -1;
-
/*
* If match_beginning or match_end is specified, there is no
* point starting from a wrong line that will never match and
else if (match_end)
line = img->nr - preimage->nr;
- if (line > img->nr)
+ /*
+ * Because the comparison is unsigned, the following test
+ * will also take care of a negative line number that can
+ * result when match_end and preimage is larger than the target.
+ */
+ if ((size_t) line > img->nr)
line = img->nr;
try = 0;
int i, nr;
size_t remove_count, insert_count, applied_at = 0;
char *result;
+ int preimage_limit;
+
+ /*
+ * If we are removing blank lines at the end of img,
+ * the preimage may extend beyond the end.
+ * If that is the case, we must be careful only to
+ * remove the part of the preimage that falls within
+ * the boundaries of img. Initialize preimage_limit
+ * to the number of lines in the preimage that falls
+ * within the boundaries.
+ */
+ preimage_limit = preimage->nr;
+ if (preimage_limit > img->nr - applied_pos)
+ preimage_limit = img->nr - applied_pos;
for (i = 0; i < applied_pos; i++)
applied_at += img->line[i].len;
remove_count = 0;
- for (i = 0; i < preimage->nr; i++)
+ for (i = 0; i < preimage_limit; i++)
remove_count += img->line[applied_pos + i].len;
insert_count = postimage->len;
result[img->len] = '\0';
/* Adjust the line table */
- nr = img->nr + postimage->nr - preimage->nr;
- if (preimage->nr < postimage->nr) {
+ nr = img->nr + postimage->nr - preimage_limit;
+ if (preimage_limit < postimage->nr) {
/*
* NOTE: this knows that we never call remove_first_line()
* on anything other than pre/post image.
img->line = xrealloc(img->line, nr * sizeof(*img->line));
img->line_allocated = img->line;
}
- if (preimage->nr != postimage->nr)
+ if (preimage_limit != postimage->nr)
memmove(img->line + applied_pos + postimage->nr,
- img->line + applied_pos + preimage->nr,
- (img->nr - (applied_pos + preimage->nr)) *
+ img->line + applied_pos + preimage_limit,
+ (img->nr - (applied_pos + preimage_limit)) *
sizeof(*img->line));
memcpy(img->line + applied_pos,
postimage->line,
if (applied_pos >= 0) {
if (new_blank_lines_at_end &&
- preimage.nr + applied_pos == img->nr &&
+ preimage.nr + applied_pos >= img->nr &&
(ws_rule & WS_BLANK_AT_EOF) &&
ws_error_action != nowarn_ws_error) {
record_ws_error(WS_BLANK_AT_EOF, "+", 1, frag->linenr);