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[PATCH v6 05/44] builtin/apply: make parse_chunk() return a negative integer on error

From
Christian Couder <christian.couder@gmail.com>
Date
Jun 10, 2016, 20:10 UTC
Message-ID
<20160610201118.13813-6-chriscool@tuxfamily.org>
In-Reply-To
<20160610201118.13813-1-chriscool@tuxfamily.org>

To libify `git apply` functionality we have to signal errors to the caller instead of die()ing or exit()ing.

To do that in a compatible manner with the rest of the error handling in builtin/apply.c, parse_chunk() should return -1 instead of calling die() or exit().

As parse_chunk() is called only by apply_patch() which already returns -1 when an error happened, let's make apply_patch() return -1 when parse_chunk() returns -1.

If find_header() returns -2 because no patch header has been found, it is ok for parse_chunk() to also return -2. If find_header() returns -1 because an error happened, it is ok for parse_chunk() to do the same.

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 builtin/apply.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/builtin/apply.c b/builtin/apply.c
index 630c01c..a160338 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -1991,22 +1991,22 @@ static int use_patch(struct apply_state *state, struct patch *p)
 	return !state->has_include;
 }
 
-
 /*
  * 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
- * again for the next patch.
+ *
+ * Returns:
+ *   -1 on error,
+ *   -2 if no header was found,
+ *   the number of bytes consumed otherwise,
+ *     so that the caller can call us again for the next patch.
  */
 static int parse_chunk(struct apply_state *state, char *buffer, unsigned long size, struct patch *patch)
 {
 	int hdrsize, patchsize;
 	int offset = find_header(state, buffer, size, &hdrsize, patch);
 
-	if (offset == -1)
-		exit(1);
-
 	if (offset < 0)
 		return offset;
 
@@ -2067,7 +2067,7 @@ static int parse_chunk(struct apply_state *state, char *buffer, unsigned long si
 		 */
 		if ((state->apply || state->check) &&
 		    (!patch->is_binary && !metadata_changes(patch)))
-			die(_("patch with only garbage at line %d"), state->linenr);
+			return error(_("patch with only garbage at line %d"), state->linenr);
 	}
 
 	return offset + hdrsize + patchsize;
@@ -4449,6 +4449,10 @@ static int apply_patch(struct apply_state *state,
 		nr = parse_chunk(state, buf.buf + offset, buf.len - offset, patch);
 		if (nr < 0) {
 			free_patch(patch);
+			if (nr == -1) {
+				res = -1;
+				goto end;
+			}
 			break;
 		}
 		if (state->apply_in_reverse)

-- 
2.9.0.rc2.362.g3cd93d0
Previous: Christian Couder
Message 50 of 50 in “libify apply and use lib in am, part 2”
  1. 00/44 libify apply and use lib in am, part 2Christian Couder, Jun 10, 2016
  2. 02/44 builtin/apply: make apply_patch() return -1 instead of die()ingChristian Couder, Jun 10, 2016
  3. 07/44 builtin/apply: make parse_whitespace_option() return -1 instead of die()ingChristian Couder, Jun 10, 2016
  4. 01/44 apply: move 'struct apply_state' to apply.hChristian Couder, Jun 10, 2016
  5. 06/44 builtin/apply: make parse_single_patch() return -1 on errorChristian Couder, Jun 10, 2016
  6. 10/44 apply: make init_apply_state() return -1 instead of exit()ingChristian Couder, Jun 10, 2016
  7. 04/44 builtin/apply: make find_header() return -1 instead of die()ingChristian Couder, Jun 10, 2016
  8. 16/44 builtin/apply: make gitdiff_*() return -1 on errorChristian Couder, Jun 10, 2016
  9. 15/44 builtin/apply: make gitdiff_*() return 1 at end of headerChristian Couder, Jun 10, 2016
  10. 23/44 builtin/apply: make write_out_one_result() return -1 on errorChristian Couder, Jun 10, 2016
  11. 17/44 builtin/apply: change die_on_unsafe_path() to check_unsafe_path()Christian Couder, Jun 10, 2016
  12. 25/44 builtin/apply: make try_create_file() return -1 on errorChristian Couder, Jun 10, 2016
  13. 18/44 builtin/apply: make build_fake_ancestor() return -1 on errorChristian Couder, Jun 10, 2016
  14. 27/44 builtin/apply: rename option parsing functionsChristian Couder, Jun 10, 2016
  15. 28/44 apply: rename and move opt constants to apply.hChristian Couder, Jun 10, 2016
  16. 22/44 builtin/apply: make create_file() return -1 on errorChristian Couder, Jun 10, 2016
  17. 21/44 builtin/apply: make add_index_file() return -1 on errorChristian Couder, Jun 10, 2016
  18. 26/44 builtin/apply: make create_one_file() return -1 on errorChristian Couder, Jun 10, 2016
  19. 24/44 builtin/apply: make write_out_results() return -1 on errorChristian Couder, Jun 10, 2016
  20. 31/44 run-command: make dup_devnull() non staticChristian Couder, Jun 10, 2016
  21. Johannes SixtJun 11, 2016
  22. Christian CouderJun 11, 2016
  23. 35/44 apply: add 'be_silent' variable to 'struct apply_state'Christian Couder, Jun 10, 2016
  24. 36/44 apply: make 'be_silent' incompatible with 'apply_verbosely'Christian Couder, Jun 10, 2016
  25. 37/44 apply: don't print on stdout when be_silent is setChristian Couder, Jun 10, 2016
  26. 43/44 builtin/apply: add a cli option for be_silentChristian Couder, Jun 10, 2016
  27. René ScharfeJun 10, 2016
  28. Christian CouderJun 11, 2016
  29. 38/44 usage: add set_warn_routine()Christian Couder, Jun 10, 2016
  30. 44/44 apply: use error_errno() where possibleChristian Couder, Jun 10, 2016
  31. 39/44 usage: add get_error_routine() and get_warn_routine()Christian Couder, Jun 10, 2016
  32. 41/44 am: use be_silent in 'struct apply_state' to shut up applying patchesChristian Couder, Jun 10, 2016
  33. Junio C HamanoJun 10, 2016
  34. Christian CouderJun 11, 2016
  35. 42/44 run-command: make dup_devnull() static againChristian Couder, Jun 10, 2016
  36. 40/44 apply: change error_routine when be_silent is setChristian Couder, Jun 10, 2016
  37. 30/44 apply: make some parsing functions static againChristian Couder, Jun 10, 2016
  38. 34/44 write_or_die: use warning() instead of fprintf(stderr, ...)Christian Couder, Jun 10, 2016
  39. 33/44 builtin/am: use apply api in run_apply()Christian Couder, Jun 10, 2016
  40. 19/44 builtin/apply: make remove_file() return -1 on errorChristian Couder, Jun 10, 2016
  41. 32/44 environment: add set_index_file()Christian Couder, Jun 10, 2016
  42. 20/44 builtin/apply: make add_conflicted_stages_file() return -1 on errorChristian Couder, Jun 10, 2016
  43. 14/44 builtin/apply: make parse_traditional_patch() return -1 on errorChristian Couder, Jun 10, 2016
  44. 12/44 builtin/apply: move check_apply_state() to apply.cChristian Couder, Jun 10, 2016
  45. 09/44 builtin/apply: move init_apply_state() to apply.cChristian Couder, Jun 10, 2016
  46. 11/44 builtin/apply: make check_apply_state() return -1 instead of die()ingChristian Couder, Jun 10, 2016
  47. 13/44 builtin/apply: make apply_all_patches() return -1 on errorChristian Couder, Jun 10, 2016
  48. 03/44 builtin/apply: read_patch_file() return -1 instead of die()ingChristian Couder, Jun 10, 2016
  49. 08/44 builtin/apply: make parse_ignorewhitespace_option() return -1 instead of die()ingChristian Couder, Jun 10, 2016
  50. 05/44 builtin/apply: make parse_chunk() return a negative integer on errorChristian Couder, Jun 10, 2016

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