commit.con commit Merge branch 'ma/mailing-list-address-in-git-help' (20f28d7)
   1#include "cache.h"
   2#include "tag.h"
   3#include "commit.h"
   4#include "commit-graph.h"
   5#include "repository.h"
   6#include "object-store.h"
   7#include "pkt-line.h"
   8#include "utf8.h"
   9#include "diff.h"
  10#include "revision.h"
  11#include "notes.h"
  12#include "alloc.h"
  13#include "gpg-interface.h"
  14#include "mergesort.h"
  15#include "commit-slab.h"
  16#include "prio-queue.h"
  17#include "sha1-lookup.h"
  18#include "wt-status.h"
  19#include "advice.h"
  20
  21static struct commit_extra_header *read_commit_extra_header_lines(const char *buf, size_t len, const char **);
  22
  23int save_commit_buffer = 1;
  24
  25const char *commit_type = "commit";
  26
  27struct commit *lookup_commit_reference_gently(struct repository *r,
  28                const struct object_id *oid, int quiet)
  29{
  30        struct object *obj = deref_tag(r,
  31                                       parse_object(r, oid),
  32                                       NULL, 0);
  33
  34        if (!obj)
  35                return NULL;
  36        return object_as_type(r, obj, OBJ_COMMIT, quiet);
  37}
  38
  39struct commit *lookup_commit_reference(struct repository *r, const struct object_id *oid)
  40{
  41        return lookup_commit_reference_gently(r, oid, 0);
  42}
  43
  44struct commit *lookup_commit_or_die(const struct object_id *oid, const char *ref_name)
  45{
  46        struct commit *c = lookup_commit_reference(the_repository, oid);
  47        if (!c)
  48                die(_("could not parse %s"), ref_name);
  49        if (!oideq(oid, &c->object.oid)) {
  50                warning(_("%s %s is not a commit!"),
  51                        ref_name, oid_to_hex(oid));
  52        }
  53        return c;
  54}
  55
  56struct commit *lookup_commit(struct repository *r, const struct object_id *oid)
  57{
  58        struct object *obj = lookup_object(r, oid->hash);
  59        if (!obj)
  60                return create_object(r, oid->hash,
  61                                     alloc_commit_node(r));
  62        return object_as_type(r, obj, OBJ_COMMIT, 0);
  63}
  64
  65struct commit *lookup_commit_reference_by_name(const char *name)
  66{
  67        struct object_id oid;
  68        struct commit *commit;
  69
  70        if (get_oid_committish(name, &oid))
  71                return NULL;
  72        commit = lookup_commit_reference(the_repository, &oid);
  73        if (parse_commit(commit))
  74                return NULL;
  75        return commit;
  76}
  77
  78static timestamp_t parse_commit_date(const char *buf, const char *tail)
  79{
  80        const char *dateptr;
  81
  82        if (buf + 6 >= tail)
  83                return 0;
  84        if (memcmp(buf, "author", 6))
  85                return 0;
  86        while (buf < tail && *buf++ != '\n')
  87                /* nada */;
  88        if (buf + 9 >= tail)
  89                return 0;
  90        if (memcmp(buf, "committer", 9))
  91                return 0;
  92        while (buf < tail && *buf++ != '>')
  93                /* nada */;
  94        if (buf >= tail)
  95                return 0;
  96        dateptr = buf;
  97        while (buf < tail && *buf++ != '\n')
  98                /* nada */;
  99        if (buf >= tail)
 100                return 0;
 101        /* dateptr < buf && buf[-1] == '\n', so parsing will stop at buf-1 */
 102        return parse_timestamp(dateptr, NULL, 10);
 103}
 104
 105static const unsigned char *commit_graft_sha1_access(size_t index, void *table)
 106{
 107        struct commit_graft **commit_graft_table = table;
 108        return commit_graft_table[index]->oid.hash;
 109}
 110
 111static int commit_graft_pos(struct repository *r, const unsigned char *sha1)
 112{
 113        return sha1_pos(sha1, r->parsed_objects->grafts,
 114                        r->parsed_objects->grafts_nr,
 115                        commit_graft_sha1_access);
 116}
 117
 118int register_commit_graft(struct repository *r, struct commit_graft *graft,
 119                          int ignore_dups)
 120{
 121        int pos = commit_graft_pos(r, graft->oid.hash);
 122
 123        if (0 <= pos) {
 124                if (ignore_dups)
 125                        free(graft);
 126                else {
 127                        free(r->parsed_objects->grafts[pos]);
 128                        r->parsed_objects->grafts[pos] = graft;
 129                }
 130                return 1;
 131        }
 132        pos = -pos - 1;
 133        ALLOC_GROW(r->parsed_objects->grafts,
 134                   r->parsed_objects->grafts_nr + 1,
 135                   r->parsed_objects->grafts_alloc);
 136        r->parsed_objects->grafts_nr++;
 137        if (pos < r->parsed_objects->grafts_nr)
 138                memmove(r->parsed_objects->grafts + pos + 1,
 139                        r->parsed_objects->grafts + pos,
 140                        (r->parsed_objects->grafts_nr - pos - 1) *
 141                        sizeof(*r->parsed_objects->grafts));
 142        r->parsed_objects->grafts[pos] = graft;
 143        return 0;
 144}
 145
 146struct commit_graft *read_graft_line(struct strbuf *line)
 147{
 148        /* The format is just "Commit Parent1 Parent2 ...\n" */
 149        int i, phase;
 150        const char *tail = NULL;
 151        struct commit_graft *graft = NULL;
 152        struct object_id dummy_oid, *oid;
 153
 154        strbuf_rtrim(line);
 155        if (!line->len || line->buf[0] == '#')
 156                return NULL;
 157        /*
 158         * phase 0 verifies line, counts hashes in line and allocates graft
 159         * phase 1 fills graft
 160         */
 161        for (phase = 0; phase < 2; phase++) {
 162                oid = graft ? &graft->oid : &dummy_oid;
 163                if (parse_oid_hex(line->buf, oid, &tail))
 164                        goto bad_graft_data;
 165                for (i = 0; *tail != '\0'; i++) {
 166                        oid = graft ? &graft->parent[i] : &dummy_oid;
 167                        if (!isspace(*tail++) || parse_oid_hex(tail, oid, &tail))
 168                                goto bad_graft_data;
 169                }
 170                if (!graft) {
 171                        graft = xmalloc(st_add(sizeof(*graft),
 172                                               st_mult(sizeof(struct object_id), i)));
 173                        graft->nr_parent = i;
 174                }
 175        }
 176        return graft;
 177
 178bad_graft_data:
 179        error("bad graft data: %s", line->buf);
 180        assert(!graft);
 181        return NULL;
 182}
 183
 184static int read_graft_file(struct repository *r, const char *graft_file)
 185{
 186        FILE *fp = fopen_or_warn(graft_file, "r");
 187        struct strbuf buf = STRBUF_INIT;
 188        if (!fp)
 189                return -1;
 190        if (advice_graft_file_deprecated)
 191                advise(_("Support for <GIT_DIR>/info/grafts is deprecated\n"
 192                         "and will be removed in a future Git version.\n"
 193                         "\n"
 194                         "Please use \"git replace --convert-graft-file\"\n"
 195                         "to convert the grafts into replace refs.\n"
 196                         "\n"
 197                         "Turn this message off by running\n"
 198                         "\"git config advice.graftFileDeprecated false\""));
 199        while (!strbuf_getwholeline(&buf, fp, '\n')) {
 200                /* The format is just "Commit Parent1 Parent2 ...\n" */
 201                struct commit_graft *graft = read_graft_line(&buf);
 202                if (!graft)
 203                        continue;
 204                if (register_commit_graft(r, graft, 1))
 205                        error("duplicate graft data: %s", buf.buf);
 206        }
 207        fclose(fp);
 208        strbuf_release(&buf);
 209        return 0;
 210}
 211
 212void prepare_commit_graft(struct repository *r)
 213{
 214        char *graft_file;
 215
 216        if (r->parsed_objects->commit_graft_prepared)
 217                return;
 218        if (!startup_info->have_repository)
 219                return;
 220
 221        graft_file = get_graft_file(r);
 222        read_graft_file(r, graft_file);
 223        /* make sure shallows are read */
 224        is_repository_shallow(r);
 225        r->parsed_objects->commit_graft_prepared = 1;
 226}
 227
 228struct commit_graft *lookup_commit_graft(struct repository *r, const struct object_id *oid)
 229{
 230        int pos;
 231        prepare_commit_graft(r);
 232        pos = commit_graft_pos(r, oid->hash);
 233        if (pos < 0)
 234                return NULL;
 235        return r->parsed_objects->grafts[pos];
 236}
 237
 238int for_each_commit_graft(each_commit_graft_fn fn, void *cb_data)
 239{
 240        int i, ret;
 241        for (i = ret = 0; i < the_repository->parsed_objects->grafts_nr && !ret; i++)
 242                ret = fn(the_repository->parsed_objects->grafts[i], cb_data);
 243        return ret;
 244}
 245
 246int unregister_shallow(const struct object_id *oid)
 247{
 248        int pos = commit_graft_pos(the_repository, oid->hash);
 249        if (pos < 0)
 250                return -1;
 251        if (pos + 1 < the_repository->parsed_objects->grafts_nr)
 252                MOVE_ARRAY(the_repository->parsed_objects->grafts + pos,
 253                           the_repository->parsed_objects->grafts + pos + 1,
 254                           the_repository->parsed_objects->grafts_nr - pos - 1);
 255        the_repository->parsed_objects->grafts_nr--;
 256        return 0;
 257}
 258
 259struct commit_buffer {
 260        void *buffer;
 261        unsigned long size;
 262};
 263define_commit_slab(buffer_slab, struct commit_buffer);
 264
 265struct buffer_slab *allocate_commit_buffer_slab(void)
 266{
 267        struct buffer_slab *bs = xmalloc(sizeof(*bs));
 268        init_buffer_slab(bs);
 269        return bs;
 270}
 271
 272void free_commit_buffer_slab(struct buffer_slab *bs)
 273{
 274        clear_buffer_slab(bs);
 275        free(bs);
 276}
 277
 278void set_commit_buffer(struct repository *r, struct commit *commit, void *buffer, unsigned long size)
 279{
 280        struct commit_buffer *v = buffer_slab_at(
 281                r->parsed_objects->buffer_slab, commit);
 282        v->buffer = buffer;
 283        v->size = size;
 284}
 285
 286const void *get_cached_commit_buffer(struct repository *r, const struct commit *commit, unsigned long *sizep)
 287{
 288        struct commit_buffer *v = buffer_slab_peek(
 289                r->parsed_objects->buffer_slab, commit);
 290        if (!v) {
 291                if (sizep)
 292                        *sizep = 0;
 293                return NULL;
 294        }
 295        if (sizep)
 296                *sizep = v->size;
 297        return v->buffer;
 298}
 299
 300const void *get_commit_buffer(const struct commit *commit, unsigned long *sizep)
 301{
 302        const void *ret = get_cached_commit_buffer(the_repository, commit, sizep);
 303        if (!ret) {
 304                enum object_type type;
 305                unsigned long size;
 306                ret = read_object_file(&commit->object.oid, &type, &size);
 307                if (!ret)
 308                        die("cannot read commit object %s",
 309                            oid_to_hex(&commit->object.oid));
 310                if (type != OBJ_COMMIT)
 311                        die("expected commit for %s, got %s",
 312                            oid_to_hex(&commit->object.oid), type_name(type));
 313                if (sizep)
 314                        *sizep = size;
 315        }
 316        return ret;
 317}
 318
 319void unuse_commit_buffer(const struct commit *commit, const void *buffer)
 320{
 321        struct commit_buffer *v = buffer_slab_peek(
 322                the_repository->parsed_objects->buffer_slab, commit);
 323        if (!(v && v->buffer == buffer))
 324                free((void *)buffer);
 325}
 326
 327void free_commit_buffer(struct commit *commit)
 328{
 329        struct commit_buffer *v = buffer_slab_peek(
 330                the_repository->parsed_objects->buffer_slab, commit);
 331        if (v) {
 332                FREE_AND_NULL(v->buffer);
 333                v->size = 0;
 334        }
 335}
 336
 337struct tree *get_commit_tree(const struct commit *commit)
 338{
 339        if (commit->maybe_tree || !commit->object.parsed)
 340                return commit->maybe_tree;
 341
 342        if (commit->graph_pos == COMMIT_NOT_FROM_GRAPH)
 343                BUG("commit has NULL tree, but was not loaded from commit-graph");
 344
 345        return get_commit_tree_in_graph(the_repository, commit);
 346}
 347
 348struct object_id *get_commit_tree_oid(const struct commit *commit)
 349{
 350        return &get_commit_tree(commit)->object.oid;
 351}
 352
 353void release_commit_memory(struct commit *c)
 354{
 355        c->maybe_tree = NULL;
 356        c->index = 0;
 357        free_commit_buffer(c);
 358        free_commit_list(c->parents);
 359        /* TODO: what about commit->util? */
 360
 361        c->object.parsed = 0;
 362}
 363
 364const void *detach_commit_buffer(struct commit *commit, unsigned long *sizep)
 365{
 366        struct commit_buffer *v = buffer_slab_peek(
 367                the_repository->parsed_objects->buffer_slab, commit);
 368        void *ret;
 369
 370        if (!v) {
 371                if (sizep)
 372                        *sizep = 0;
 373                return NULL;
 374        }
 375        ret = v->buffer;
 376        if (sizep)
 377                *sizep = v->size;
 378
 379        v->buffer = NULL;
 380        v->size = 0;
 381        return ret;
 382}
 383
 384int parse_commit_buffer(struct repository *r, struct commit *item, const void *buffer, unsigned long size, int check_graph)
 385{
 386        const char *tail = buffer;
 387        const char *bufptr = buffer;
 388        struct object_id parent;
 389        struct commit_list **pptr;
 390        struct commit_graft *graft;
 391        const int tree_entry_len = the_hash_algo->hexsz + 5;
 392        const int parent_entry_len = the_hash_algo->hexsz + 7;
 393
 394        if (item->object.parsed)
 395                return 0;
 396        item->object.parsed = 1;
 397        tail += size;
 398        if (tail <= bufptr + tree_entry_len + 1 || memcmp(bufptr, "tree ", 5) ||
 399                        bufptr[tree_entry_len] != '\n')
 400                return error("bogus commit object %s", oid_to_hex(&item->object.oid));
 401        if (get_oid_hex(bufptr + 5, &parent) < 0)
 402                return error("bad tree pointer in commit %s",
 403                             oid_to_hex(&item->object.oid));
 404        item->maybe_tree = lookup_tree(r, &parent);
 405        bufptr += tree_entry_len + 1; /* "tree " + "hex sha1" + "\n" */
 406        pptr = &item->parents;
 407
 408        graft = lookup_commit_graft(r, &item->object.oid);
 409        while (bufptr + parent_entry_len < tail && !memcmp(bufptr, "parent ", 7)) {
 410                struct commit *new_parent;
 411
 412                if (tail <= bufptr + parent_entry_len + 1 ||
 413                    get_oid_hex(bufptr + 7, &parent) ||
 414                    bufptr[parent_entry_len] != '\n')
 415                        return error("bad parents in commit %s", oid_to_hex(&item->object.oid));
 416                bufptr += parent_entry_len + 1;
 417                /*
 418                 * The clone is shallow if nr_parent < 0, and we must
 419                 * not traverse its real parents even when we unhide them.
 420                 */
 421                if (graft && (graft->nr_parent < 0 || grafts_replace_parents))
 422                        continue;
 423                new_parent = lookup_commit(r, &parent);
 424                if (new_parent)
 425                        pptr = &commit_list_insert(new_parent, pptr)->next;
 426        }
 427        if (graft) {
 428                int i;
 429                struct commit *new_parent;
 430                for (i = 0; i < graft->nr_parent; i++) {
 431                        new_parent = lookup_commit(r,
 432                                                   &graft->parent[i]);
 433                        if (!new_parent)
 434                                continue;
 435                        pptr = &commit_list_insert(new_parent, pptr)->next;
 436                }
 437        }
 438        item->date = parse_commit_date(bufptr, tail);
 439
 440        if (check_graph)
 441                load_commit_graph_info(the_repository, item);
 442
 443        return 0;
 444}
 445
 446int parse_commit_internal(struct commit *item, int quiet_on_missing, int use_commit_graph)
 447{
 448        enum object_type type;
 449        void *buffer;
 450        unsigned long size;
 451        int ret;
 452
 453        if (!item)
 454                return -1;
 455        if (item->object.parsed)
 456                return 0;
 457        if (use_commit_graph && parse_commit_in_graph(the_repository, item))
 458                return 0;
 459        buffer = read_object_file(&item->object.oid, &type, &size);
 460        if (!buffer)
 461                return quiet_on_missing ? -1 :
 462                        error("Could not read %s",
 463                             oid_to_hex(&item->object.oid));
 464        if (type != OBJ_COMMIT) {
 465                free(buffer);
 466                return error("Object %s not a commit",
 467                             oid_to_hex(&item->object.oid));
 468        }
 469
 470        ret = parse_commit_buffer(the_repository, item, buffer, size, 0);
 471        if (save_commit_buffer && !ret) {
 472                set_commit_buffer(the_repository, item, buffer, size);
 473                return 0;
 474        }
 475        free(buffer);
 476        return ret;
 477}
 478
 479int parse_commit_gently(struct commit *item, int quiet_on_missing)
 480{
 481        return parse_commit_internal(item, quiet_on_missing, 1);
 482}
 483
 484void parse_commit_or_die(struct commit *item)
 485{
 486        if (parse_commit(item))
 487                die("unable to parse commit %s",
 488                    item ? oid_to_hex(&item->object.oid) : "(null)");
 489}
 490
 491int find_commit_subject(const char *commit_buffer, const char **subject)
 492{
 493        const char *eol;
 494        const char *p = commit_buffer;
 495
 496        while (*p && (*p != '\n' || p[1] != '\n'))
 497                p++;
 498        if (*p) {
 499                p = skip_blank_lines(p + 2);
 500                eol = strchrnul(p, '\n');
 501        } else
 502                eol = p;
 503
 504        *subject = p;
 505
 506        return eol - p;
 507}
 508
 509struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
 510{
 511        struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
 512        new_list->item = item;
 513        new_list->next = *list_p;
 514        *list_p = new_list;
 515        return new_list;
 516}
 517
 518unsigned commit_list_count(const struct commit_list *l)
 519{
 520        unsigned c = 0;
 521        for (; l; l = l->next )
 522                c++;
 523        return c;
 524}
 525
 526struct commit_list *copy_commit_list(struct commit_list *list)
 527{
 528        struct commit_list *head = NULL;
 529        struct commit_list **pp = &head;
 530        while (list) {
 531                pp = commit_list_append(list->item, pp);
 532                list = list->next;
 533        }
 534        return head;
 535}
 536
 537void free_commit_list(struct commit_list *list)
 538{
 539        while (list)
 540                pop_commit(&list);
 541}
 542
 543struct commit_list * commit_list_insert_by_date(struct commit *item, struct commit_list **list)
 544{
 545        struct commit_list **pp = list;
 546        struct commit_list *p;
 547        while ((p = *pp) != NULL) {
 548                if (p->item->date < item->date) {
 549                        break;
 550                }
 551                pp = &p->next;
 552        }
 553        return commit_list_insert(item, pp);
 554}
 555
 556static int commit_list_compare_by_date(const void *a, const void *b)
 557{
 558        timestamp_t a_date = ((const struct commit_list *)a)->item->date;
 559        timestamp_t b_date = ((const struct commit_list *)b)->item->date;
 560        if (a_date < b_date)
 561                return 1;
 562        if (a_date > b_date)
 563                return -1;
 564        return 0;
 565}
 566
 567static void *commit_list_get_next(const void *a)
 568{
 569        return ((const struct commit_list *)a)->next;
 570}
 571
 572static void commit_list_set_next(void *a, void *next)
 573{
 574        ((struct commit_list *)a)->next = next;
 575}
 576
 577void commit_list_sort_by_date(struct commit_list **list)
 578{
 579        *list = llist_mergesort(*list, commit_list_get_next, commit_list_set_next,
 580                                commit_list_compare_by_date);
 581}
 582
 583struct commit *pop_most_recent_commit(struct commit_list **list,
 584                                      unsigned int mark)
 585{
 586        struct commit *ret = pop_commit(list);
 587        struct commit_list *parents = ret->parents;
 588
 589        while (parents) {
 590                struct commit *commit = parents->item;
 591                if (!parse_commit(commit) && !(commit->object.flags & mark)) {
 592                        commit->object.flags |= mark;
 593                        commit_list_insert_by_date(commit, list);
 594                }
 595                parents = parents->next;
 596        }
 597        return ret;
 598}
 599
 600static void clear_commit_marks_1(struct commit_list **plist,
 601                                 struct commit *commit, unsigned int mark)
 602{
 603        while (commit) {
 604                struct commit_list *parents;
 605
 606                if (!(mark & commit->object.flags))
 607                        return;
 608
 609                commit->object.flags &= ~mark;
 610
 611                parents = commit->parents;
 612                if (!parents)
 613                        return;
 614
 615                while ((parents = parents->next))
 616                        commit_list_insert(parents->item, plist);
 617
 618                commit = commit->parents->item;
 619        }
 620}
 621
 622void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark)
 623{
 624        struct commit_list *list = NULL;
 625
 626        while (nr--) {
 627                clear_commit_marks_1(&list, *commit, mark);
 628                commit++;
 629        }
 630        while (list)
 631                clear_commit_marks_1(&list, pop_commit(&list), mark);
 632}
 633
 634void clear_commit_marks(struct commit *commit, unsigned int mark)
 635{
 636        clear_commit_marks_many(1, &commit, mark);
 637}
 638
 639struct commit *pop_commit(struct commit_list **stack)
 640{
 641        struct commit_list *top = *stack;
 642        struct commit *item = top ? top->item : NULL;
 643
 644        if (top) {
 645                *stack = top->next;
 646                free(top);
 647        }
 648        return item;
 649}
 650
 651/*
 652 * Topological sort support
 653 */
 654
 655/* count number of children that have not been emitted */
 656define_commit_slab(indegree_slab, int);
 657
 658/* record author-date for each commit object */
 659define_commit_slab(author_date_slab, timestamp_t);
 660
 661static void record_author_date(struct author_date_slab *author_date,
 662                               struct commit *commit)
 663{
 664        const char *buffer = get_commit_buffer(commit, NULL);
 665        struct ident_split ident;
 666        const char *ident_line;
 667        size_t ident_len;
 668        char *date_end;
 669        timestamp_t date;
 670
 671        ident_line = find_commit_header(buffer, "author", &ident_len);
 672        if (!ident_line)
 673                goto fail_exit; /* no author line */
 674        if (split_ident_line(&ident, ident_line, ident_len) ||
 675            !ident.date_begin || !ident.date_end)
 676                goto fail_exit; /* malformed "author" line */
 677
 678        date = parse_timestamp(ident.date_begin, &date_end, 10);
 679        if (date_end != ident.date_end)
 680                goto fail_exit; /* malformed date */
 681        *(author_date_slab_at(author_date, commit)) = date;
 682
 683fail_exit:
 684        unuse_commit_buffer(commit, buffer);
 685}
 686
 687static int compare_commits_by_author_date(const void *a_, const void *b_,
 688                                          void *cb_data)
 689{
 690        const struct commit *a = a_, *b = b_;
 691        struct author_date_slab *author_date = cb_data;
 692        timestamp_t a_date = *(author_date_slab_at(author_date, a));
 693        timestamp_t b_date = *(author_date_slab_at(author_date, b));
 694
 695        /* newer commits with larger date first */
 696        if (a_date < b_date)
 697                return 1;
 698        else if (a_date > b_date)
 699                return -1;
 700        return 0;
 701}
 702
 703int compare_commits_by_gen_then_commit_date(const void *a_, const void *b_, void *unused)
 704{
 705        const struct commit *a = a_, *b = b_;
 706
 707        /* newer commits first */
 708        if (a->generation < b->generation)
 709                return 1;
 710        else if (a->generation > b->generation)
 711                return -1;
 712
 713        /* use date as a heuristic when generations are equal */
 714        if (a->date < b->date)
 715                return 1;
 716        else if (a->date > b->date)
 717                return -1;
 718        return 0;
 719}
 720
 721int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused)
 722{
 723        const struct commit *a = a_, *b = b_;
 724        /* newer commits with larger date first */
 725        if (a->date < b->date)
 726                return 1;
 727        else if (a->date > b->date)
 728                return -1;
 729        return 0;
 730}
 731
 732/*
 733 * Performs an in-place topological sort on the list supplied.
 734 */
 735void sort_in_topological_order(struct commit_list **list, enum rev_sort_order sort_order)
 736{
 737        struct commit_list *next, *orig = *list;
 738        struct commit_list **pptr;
 739        struct indegree_slab indegree;
 740        struct prio_queue queue;
 741        struct commit *commit;
 742        struct author_date_slab author_date;
 743
 744        if (!orig)
 745                return;
 746        *list = NULL;
 747
 748        init_indegree_slab(&indegree);
 749        memset(&queue, '\0', sizeof(queue));
 750
 751        switch (sort_order) {
 752        default: /* REV_SORT_IN_GRAPH_ORDER */
 753                queue.compare = NULL;
 754                break;
 755        case REV_SORT_BY_COMMIT_DATE:
 756                queue.compare = compare_commits_by_commit_date;
 757                break;
 758        case REV_SORT_BY_AUTHOR_DATE:
 759                init_author_date_slab(&author_date);
 760                queue.compare = compare_commits_by_author_date;
 761                queue.cb_data = &author_date;
 762                break;
 763        }
 764
 765        /* Mark them and clear the indegree */
 766        for (next = orig; next; next = next->next) {
 767                struct commit *commit = next->item;
 768                *(indegree_slab_at(&indegree, commit)) = 1;
 769                /* also record the author dates, if needed */
 770                if (sort_order == REV_SORT_BY_AUTHOR_DATE)
 771                        record_author_date(&author_date, commit);
 772        }
 773
 774        /* update the indegree */
 775        for (next = orig; next; next = next->next) {
 776                struct commit_list *parents = next->item->parents;
 777                while (parents) {
 778                        struct commit *parent = parents->item;
 779                        int *pi = indegree_slab_at(&indegree, parent);
 780
 781                        if (*pi)
 782                                (*pi)++;
 783                        parents = parents->next;
 784                }
 785        }
 786
 787        /*
 788         * find the tips
 789         *
 790         * tips are nodes not reachable from any other node in the list
 791         *
 792         * the tips serve as a starting set for the work queue.
 793         */
 794        for (next = orig; next; next = next->next) {
 795                struct commit *commit = next->item;
 796
 797                if (*(indegree_slab_at(&indegree, commit)) == 1)
 798                        prio_queue_put(&queue, commit);
 799        }
 800
 801        /*
 802         * This is unfortunate; the initial tips need to be shown
 803         * in the order given from the revision traversal machinery.
 804         */
 805        if (sort_order == REV_SORT_IN_GRAPH_ORDER)
 806                prio_queue_reverse(&queue);
 807
 808        /* We no longer need the commit list */
 809        free_commit_list(orig);
 810
 811        pptr = list;
 812        *list = NULL;
 813        while ((commit = prio_queue_get(&queue)) != NULL) {
 814                struct commit_list *parents;
 815
 816                for (parents = commit->parents; parents ; parents = parents->next) {
 817                        struct commit *parent = parents->item;
 818                        int *pi = indegree_slab_at(&indegree, parent);
 819
 820                        if (!*pi)
 821                                continue;
 822
 823                        /*
 824                         * parents are only enqueued for emission
 825                         * when all their children have been emitted thereby
 826                         * guaranteeing topological order.
 827                         */
 828                        if (--(*pi) == 1)
 829                                prio_queue_put(&queue, parent);
 830                }
 831                /*
 832                 * all children of commit have already been
 833                 * emitted. we can emit it now.
 834                 */
 835                *(indegree_slab_at(&indegree, commit)) = 0;
 836
 837                pptr = &commit_list_insert(commit, pptr)->next;
 838        }
 839
 840        clear_indegree_slab(&indegree);
 841        clear_prio_queue(&queue);
 842        if (sort_order == REV_SORT_BY_AUTHOR_DATE)
 843                clear_author_date_slab(&author_date);
 844}
 845
 846static const char gpg_sig_header[] = "gpgsig";
 847static const int gpg_sig_header_len = sizeof(gpg_sig_header) - 1;
 848
 849static int do_sign_commit(struct strbuf *buf, const char *keyid)
 850{
 851        struct strbuf sig = STRBUF_INIT;
 852        int inspos, copypos;
 853        const char *eoh;
 854
 855        /* find the end of the header */
 856        eoh = strstr(buf->buf, "\n\n");
 857        if (!eoh)
 858                inspos = buf->len;
 859        else
 860                inspos = eoh - buf->buf + 1;
 861
 862        if (!keyid || !*keyid)
 863                keyid = get_signing_key();
 864        if (sign_buffer(buf, &sig, keyid)) {
 865                strbuf_release(&sig);
 866                return -1;
 867        }
 868
 869        for (copypos = 0; sig.buf[copypos]; ) {
 870                const char *bol = sig.buf + copypos;
 871                const char *eol = strchrnul(bol, '\n');
 872                int len = (eol - bol) + !!*eol;
 873
 874                if (!copypos) {
 875                        strbuf_insert(buf, inspos, gpg_sig_header, gpg_sig_header_len);
 876                        inspos += gpg_sig_header_len;
 877                }
 878                strbuf_insert(buf, inspos++, " ", 1);
 879                strbuf_insert(buf, inspos, bol, len);
 880                inspos += len;
 881                copypos += len;
 882        }
 883        strbuf_release(&sig);
 884        return 0;
 885}
 886
 887int parse_signed_commit(const struct commit *commit,
 888                        struct strbuf *payload, struct strbuf *signature)
 889{
 890
 891        unsigned long size;
 892        const char *buffer = get_commit_buffer(commit, &size);
 893        int in_signature, saw_signature = -1;
 894        const char *line, *tail;
 895
 896        line = buffer;
 897        tail = buffer + size;
 898        in_signature = 0;
 899        saw_signature = 0;
 900        while (line < tail) {
 901                const char *sig = NULL;
 902                const char *next = memchr(line, '\n', tail - line);
 903
 904                next = next ? next + 1 : tail;
 905                if (in_signature && line[0] == ' ')
 906                        sig = line + 1;
 907                else if (starts_with(line, gpg_sig_header) &&
 908                         line[gpg_sig_header_len] == ' ')
 909                        sig = line + gpg_sig_header_len + 1;
 910                if (sig) {
 911                        strbuf_add(signature, sig, next - sig);
 912                        saw_signature = 1;
 913                        in_signature = 1;
 914                } else {
 915                        if (*line == '\n')
 916                                /* dump the whole remainder of the buffer */
 917                                next = tail;
 918                        strbuf_add(payload, line, next - line);
 919                        in_signature = 0;
 920                }
 921                line = next;
 922        }
 923        unuse_commit_buffer(commit, buffer);
 924        return saw_signature;
 925}
 926
 927int remove_signature(struct strbuf *buf)
 928{
 929        const char *line = buf->buf;
 930        const char *tail = buf->buf + buf->len;
 931        int in_signature = 0;
 932        const char *sig_start = NULL;
 933        const char *sig_end = NULL;
 934
 935        while (line < tail) {
 936                const char *next = memchr(line, '\n', tail - line);
 937                next = next ? next + 1 : tail;
 938
 939                if (in_signature && line[0] == ' ')
 940                        sig_end = next;
 941                else if (starts_with(line, gpg_sig_header) &&
 942                         line[gpg_sig_header_len] == ' ') {
 943                        sig_start = line;
 944                        sig_end = next;
 945                        in_signature = 1;
 946                } else {
 947                        if (*line == '\n')
 948                                /* dump the whole remainder of the buffer */
 949                                next = tail;
 950                        in_signature = 0;
 951                }
 952                line = next;
 953        }
 954
 955        if (sig_start)
 956                strbuf_remove(buf, sig_start - buf->buf, sig_end - sig_start);
 957
 958        return sig_start != NULL;
 959}
 960
 961static void handle_signed_tag(struct commit *parent, struct commit_extra_header ***tail)
 962{
 963        struct merge_remote_desc *desc;
 964        struct commit_extra_header *mergetag;
 965        char *buf;
 966        unsigned long size, len;
 967        enum object_type type;
 968
 969        desc = merge_remote_util(parent);
 970        if (!desc || !desc->obj)
 971                return;
 972        buf = read_object_file(&desc->obj->oid, &type, &size);
 973        if (!buf || type != OBJ_TAG)
 974                goto free_return;
 975        len = parse_signature(buf, size);
 976        if (size == len)
 977                goto free_return;
 978        /*
 979         * We could verify this signature and either omit the tag when
 980         * it does not validate, but the integrator may not have the
 981         * public key of the signer of the tag he is merging, while a
 982         * later auditor may have it while auditing, so let's not run
 983         * verify-signed-buffer here for now...
 984         *
 985         * if (verify_signed_buffer(buf, len, buf + len, size - len, ...))
 986         *      warn("warning: signed tag unverified.");
 987         */
 988        mergetag = xcalloc(1, sizeof(*mergetag));
 989        mergetag->key = xstrdup("mergetag");
 990        mergetag->value = buf;
 991        mergetag->len = size;
 992
 993        **tail = mergetag;
 994        *tail = &mergetag->next;
 995        return;
 996
 997free_return:
 998        free(buf);
 999}
1000
1001int check_commit_signature(const struct commit *commit, struct signature_check *sigc)
1002{
1003        struct strbuf payload = STRBUF_INIT;
1004        struct strbuf signature = STRBUF_INIT;
1005        int ret = 1;
1006
1007        sigc->result = 'N';
1008
1009        if (parse_signed_commit(commit, &payload, &signature) <= 0)
1010                goto out;
1011        ret = check_signature(payload.buf, payload.len, signature.buf,
1012                signature.len, sigc);
1013
1014 out:
1015        strbuf_release(&payload);
1016        strbuf_release(&signature);
1017
1018        return ret;
1019}
1020
1021
1022
1023void append_merge_tag_headers(struct commit_list *parents,
1024                              struct commit_extra_header ***tail)
1025{
1026        while (parents) {
1027                struct commit *parent = parents->item;
1028                handle_signed_tag(parent, tail);
1029                parents = parents->next;
1030        }
1031}
1032
1033static void add_extra_header(struct strbuf *buffer,
1034                             struct commit_extra_header *extra)
1035{
1036        strbuf_addstr(buffer, extra->key);
1037        if (extra->len)
1038                strbuf_add_lines(buffer, " ", extra->value, extra->len);
1039        else
1040                strbuf_addch(buffer, '\n');
1041}
1042
1043struct commit_extra_header *read_commit_extra_headers(struct commit *commit,
1044                                                      const char **exclude)
1045{
1046        struct commit_extra_header *extra = NULL;
1047        unsigned long size;
1048        const char *buffer = get_commit_buffer(commit, &size);
1049        extra = read_commit_extra_header_lines(buffer, size, exclude);
1050        unuse_commit_buffer(commit, buffer);
1051        return extra;
1052}
1053
1054int for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data)
1055{
1056        struct commit_extra_header *extra, *to_free;
1057        int res = 0;
1058
1059        to_free = read_commit_extra_headers(commit, NULL);
1060        for (extra = to_free; !res && extra; extra = extra->next) {
1061                if (strcmp(extra->key, "mergetag"))
1062                        continue; /* not a merge tag */
1063                res = fn(commit, extra, data);
1064        }
1065        free_commit_extra_headers(to_free);
1066        return res;
1067}
1068
1069static inline int standard_header_field(const char *field, size_t len)
1070{
1071        return ((len == 4 && !memcmp(field, "tree", 4)) ||
1072                (len == 6 && !memcmp(field, "parent", 6)) ||
1073                (len == 6 && !memcmp(field, "author", 6)) ||
1074                (len == 9 && !memcmp(field, "committer", 9)) ||
1075                (len == 8 && !memcmp(field, "encoding", 8)));
1076}
1077
1078static int excluded_header_field(const char *field, size_t len, const char **exclude)
1079{
1080        if (!exclude)
1081                return 0;
1082
1083        while (*exclude) {
1084                size_t xlen = strlen(*exclude);
1085                if (len == xlen && !memcmp(field, *exclude, xlen))
1086                        return 1;
1087                exclude++;
1088        }
1089        return 0;
1090}
1091
1092static struct commit_extra_header *read_commit_extra_header_lines(
1093        const char *buffer, size_t size,
1094        const char **exclude)
1095{
1096        struct commit_extra_header *extra = NULL, **tail = &extra, *it = NULL;
1097        const char *line, *next, *eof, *eob;
1098        struct strbuf buf = STRBUF_INIT;
1099
1100        for (line = buffer, eob = line + size;
1101             line < eob && *line != '\n';
1102             line = next) {
1103                next = memchr(line, '\n', eob - line);
1104                next = next ? next + 1 : eob;
1105                if (*line == ' ') {
1106                        /* continuation */
1107                        if (it)
1108                                strbuf_add(&buf, line + 1, next - (line + 1));
1109                        continue;
1110                }
1111                if (it)
1112                        it->value = strbuf_detach(&buf, &it->len);
1113                strbuf_reset(&buf);
1114                it = NULL;
1115
1116                eof = memchr(line, ' ', next - line);
1117                if (!eof)
1118                        eof = next;
1119                else if (standard_header_field(line, eof - line) ||
1120                         excluded_header_field(line, eof - line, exclude))
1121                        continue;
1122
1123                it = xcalloc(1, sizeof(*it));
1124                it->key = xmemdupz(line, eof-line);
1125                *tail = it;
1126                tail = &it->next;
1127                if (eof + 1 < next)
1128                        strbuf_add(&buf, eof + 1, next - (eof + 1));
1129        }
1130        if (it)
1131                it->value = strbuf_detach(&buf, &it->len);
1132        return extra;
1133}
1134
1135void free_commit_extra_headers(struct commit_extra_header *extra)
1136{
1137        while (extra) {
1138                struct commit_extra_header *next = extra->next;
1139                free(extra->key);
1140                free(extra->value);
1141                free(extra);
1142                extra = next;
1143        }
1144}
1145
1146int commit_tree(const char *msg, size_t msg_len, const struct object_id *tree,
1147                struct commit_list *parents, struct object_id *ret,
1148                const char *author, const char *sign_commit)
1149{
1150        struct commit_extra_header *extra = NULL, **tail = &extra;
1151        int result;
1152
1153        append_merge_tag_headers(parents, &tail);
1154        result = commit_tree_extended(msg, msg_len, tree, parents, ret,
1155                                      author, sign_commit, extra);
1156        free_commit_extra_headers(extra);
1157        return result;
1158}
1159
1160static int find_invalid_utf8(const char *buf, int len)
1161{
1162        int offset = 0;
1163        static const unsigned int max_codepoint[] = {
1164                0x7f, 0x7ff, 0xffff, 0x10ffff
1165        };
1166
1167        while (len) {
1168                unsigned char c = *buf++;
1169                int bytes, bad_offset;
1170                unsigned int codepoint;
1171                unsigned int min_val, max_val;
1172
1173                len--;
1174                offset++;
1175
1176                /* Simple US-ASCII? No worries. */
1177                if (c < 0x80)
1178                        continue;
1179
1180                bad_offset = offset-1;
1181
1182                /*
1183                 * Count how many more high bits set: that's how
1184                 * many more bytes this sequence should have.
1185                 */
1186                bytes = 0;
1187                while (c & 0x40) {
1188                        c <<= 1;
1189                        bytes++;
1190                }
1191
1192                /*
1193                 * Must be between 1 and 3 more bytes.  Longer sequences result in
1194                 * codepoints beyond U+10FFFF, which are guaranteed never to exist.
1195                 */
1196                if (bytes < 1 || 3 < bytes)
1197                        return bad_offset;
1198
1199                /* Do we *have* that many bytes? */
1200                if (len < bytes)
1201                        return bad_offset;
1202
1203                /*
1204                 * Place the encoded bits at the bottom of the value and compute the
1205                 * valid range.
1206                 */
1207                codepoint = (c & 0x7f) >> bytes;
1208                min_val = max_codepoint[bytes-1] + 1;
1209                max_val = max_codepoint[bytes];
1210
1211                offset += bytes;
1212                len -= bytes;
1213
1214                /* And verify that they are good continuation bytes */
1215                do {
1216                        codepoint <<= 6;
1217                        codepoint |= *buf & 0x3f;
1218                        if ((*buf++ & 0xc0) != 0x80)
1219                                return bad_offset;
1220                } while (--bytes);
1221
1222                /* Reject codepoints that are out of range for the sequence length. */
1223                if (codepoint < min_val || codepoint > max_val)
1224                        return bad_offset;
1225                /* Surrogates are only for UTF-16 and cannot be encoded in UTF-8. */
1226                if ((codepoint & 0x1ff800) == 0xd800)
1227                        return bad_offset;
1228                /* U+xxFFFE and U+xxFFFF are guaranteed non-characters. */
1229                if ((codepoint & 0xfffe) == 0xfffe)
1230                        return bad_offset;
1231                /* So are anything in the range U+FDD0..U+FDEF. */
1232                if (codepoint >= 0xfdd0 && codepoint <= 0xfdef)
1233                        return bad_offset;
1234        }
1235        return -1;
1236}
1237
1238/*
1239 * This verifies that the buffer is in proper utf8 format.
1240 *
1241 * If it isn't, it assumes any non-utf8 characters are Latin1,
1242 * and does the conversion.
1243 */
1244static int verify_utf8(struct strbuf *buf)
1245{
1246        int ok = 1;
1247        long pos = 0;
1248
1249        for (;;) {
1250                int bad;
1251                unsigned char c;
1252                unsigned char replace[2];
1253
1254                bad = find_invalid_utf8(buf->buf + pos, buf->len - pos);
1255                if (bad < 0)
1256                        return ok;
1257                pos += bad;
1258                ok = 0;
1259                c = buf->buf[pos];
1260                strbuf_remove(buf, pos, 1);
1261
1262                /* We know 'c' must be in the range 128-255 */
1263                replace[0] = 0xc0 + (c >> 6);
1264                replace[1] = 0x80 + (c & 0x3f);
1265                strbuf_insert(buf, pos, replace, 2);
1266                pos += 2;
1267        }
1268}
1269
1270static const char commit_utf8_warn[] =
1271N_("Warning: commit message did not conform to UTF-8.\n"
1272   "You may want to amend it after fixing the message, or set the config\n"
1273   "variable i18n.commitencoding to the encoding your project uses.\n");
1274
1275int commit_tree_extended(const char *msg, size_t msg_len,
1276                         const struct object_id *tree,
1277                         struct commit_list *parents, struct object_id *ret,
1278                         const char *author, const char *sign_commit,
1279                         struct commit_extra_header *extra)
1280{
1281        int result;
1282        int encoding_is_utf8;
1283        struct strbuf buffer;
1284
1285        assert_oid_type(tree, OBJ_TREE);
1286
1287        if (memchr(msg, '\0', msg_len))
1288                return error("a NUL byte in commit log message not allowed.");
1289
1290        /* Not having i18n.commitencoding is the same as having utf-8 */
1291        encoding_is_utf8 = is_encoding_utf8(git_commit_encoding);
1292
1293        strbuf_init(&buffer, 8192); /* should avoid reallocs for the headers */
1294        strbuf_addf(&buffer, "tree %s\n", oid_to_hex(tree));
1295
1296        /*
1297         * NOTE! This ordering means that the same exact tree merged with a
1298         * different order of parents will be a _different_ changeset even
1299         * if everything else stays the same.
1300         */
1301        while (parents) {
1302                struct commit *parent = pop_commit(&parents);
1303                strbuf_addf(&buffer, "parent %s\n",
1304                            oid_to_hex(&parent->object.oid));
1305        }
1306
1307        /* Person/date information */
1308        if (!author)
1309                author = git_author_info(IDENT_STRICT);
1310        strbuf_addf(&buffer, "author %s\n", author);
1311        strbuf_addf(&buffer, "committer %s\n", git_committer_info(IDENT_STRICT));
1312        if (!encoding_is_utf8)
1313                strbuf_addf(&buffer, "encoding %s\n", git_commit_encoding);
1314
1315        while (extra) {
1316                add_extra_header(&buffer, extra);
1317                extra = extra->next;
1318        }
1319        strbuf_addch(&buffer, '\n');
1320
1321        /* And add the comment */
1322        strbuf_add(&buffer, msg, msg_len);
1323
1324        /* And check the encoding */
1325        if (encoding_is_utf8 && !verify_utf8(&buffer))
1326                fprintf(stderr, _(commit_utf8_warn));
1327
1328        if (sign_commit && do_sign_commit(&buffer, sign_commit)) {
1329                result = -1;
1330                goto out;
1331        }
1332
1333        result = write_object_file(buffer.buf, buffer.len, commit_type, ret);
1334out:
1335        strbuf_release(&buffer);
1336        return result;
1337}
1338
1339define_commit_slab(merge_desc_slab, struct merge_remote_desc *);
1340static struct merge_desc_slab merge_desc_slab = COMMIT_SLAB_INIT(1, merge_desc_slab);
1341
1342struct merge_remote_desc *merge_remote_util(struct commit *commit)
1343{
1344        return *merge_desc_slab_at(&merge_desc_slab, commit);
1345}
1346
1347void set_merge_remote_desc(struct commit *commit,
1348                           const char *name, struct object *obj)
1349{
1350        struct merge_remote_desc *desc;
1351        FLEX_ALLOC_STR(desc, name, name);
1352        desc->obj = obj;
1353        *merge_desc_slab_at(&merge_desc_slab, commit) = desc;
1354}
1355
1356struct commit *get_merge_parent(const char *name)
1357{
1358        struct object *obj;
1359        struct commit *commit;
1360        struct object_id oid;
1361        if (get_oid(name, &oid))
1362                return NULL;
1363        obj = parse_object(the_repository, &oid);
1364        commit = (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
1365        if (commit && !merge_remote_util(commit))
1366                set_merge_remote_desc(commit, name, obj);
1367        return commit;
1368}
1369
1370/*
1371 * Append a commit to the end of the commit_list.
1372 *
1373 * next starts by pointing to the variable that holds the head of an
1374 * empty commit_list, and is updated to point to the "next" field of
1375 * the last item on the list as new commits are appended.
1376 *
1377 * Usage example:
1378 *
1379 *     struct commit_list *list;
1380 *     struct commit_list **next = &list;
1381 *
1382 *     next = commit_list_append(c1, next);
1383 *     next = commit_list_append(c2, next);
1384 *     assert(commit_list_count(list) == 2);
1385 *     return list;
1386 */
1387struct commit_list **commit_list_append(struct commit *commit,
1388                                        struct commit_list **next)
1389{
1390        struct commit_list *new_commit = xmalloc(sizeof(struct commit_list));
1391        new_commit->item = commit;
1392        *next = new_commit;
1393        new_commit->next = NULL;
1394        return &new_commit->next;
1395}
1396
1397const char *find_commit_header(const char *msg, const char *key, size_t *out_len)
1398{
1399        int key_len = strlen(key);
1400        const char *line = msg;
1401
1402        while (line) {
1403                const char *eol = strchrnul(line, '\n');
1404
1405                if (line == eol)
1406                        return NULL;
1407
1408                if (eol - line > key_len &&
1409                    !strncmp(line, key, key_len) &&
1410                    line[key_len] == ' ') {
1411                        *out_len = eol - line - key_len - 1;
1412                        return line + key_len + 1;
1413                }
1414                line = *eol ? eol + 1 : NULL;
1415        }
1416        return NULL;
1417}
1418
1419/*
1420 * Inspect the given string and determine the true "end" of the log message, in
1421 * order to find where to put a new Signed-off-by: line.  Ignored are
1422 * trailing comment lines and blank lines.  To support "git commit -s
1423 * --amend" on an existing commit, we also ignore "Conflicts:".  To
1424 * support "git commit -v", we truncate at cut lines.
1425 *
1426 * Returns the number of bytes from the tail to ignore, to be fed as
1427 * the second parameter to append_signoff().
1428 */
1429size_t ignore_non_trailer(const char *buf, size_t len)
1430{
1431        size_t boc = 0;
1432        size_t bol = 0;
1433        int in_old_conflicts_block = 0;
1434        size_t cutoff = wt_status_locate_end(buf, len);
1435
1436        while (bol < cutoff) {
1437                const char *next_line = memchr(buf + bol, '\n', len - bol);
1438
1439                if (!next_line)
1440                        next_line = buf + len;
1441                else
1442                        next_line++;
1443
1444                if (buf[bol] == comment_line_char || buf[bol] == '\n') {
1445                        /* is this the first of the run of comments? */
1446                        if (!boc)
1447                                boc = bol;
1448                        /* otherwise, it is just continuing */
1449                } else if (starts_with(buf + bol, "Conflicts:\n")) {
1450                        in_old_conflicts_block = 1;
1451                        if (!boc)
1452                                boc = bol;
1453                } else if (in_old_conflicts_block && buf[bol] == '\t') {
1454                        ; /* a pathname in the conflicts block */
1455                } else if (boc) {
1456                        /* the previous was not trailing comment */
1457                        boc = 0;
1458                        in_old_conflicts_block = 0;
1459                }
1460                bol = next_line - buf;
1461        }
1462        return boc ? len - boc : len - cutoff;
1463}