/src/git/combine-diff.c

Source
#define USE_THE_REPOSITORY_VARIABLE
#define DISABLE_SIGN_COMPARE_WARNINGS

#include "git-compat-util.h"
#include "odb.h"
#include "commit.h"
#include "convert.h"
#include "diff.h"
#include "diffcore.h"
#include "environment.h"
#include "hex.h"
#include "object-name.h"
#include "quote.h"
#include "xdiff-interface.h"
#include "xdiff/xmacros.h"
#include "log-tree.h"
#include "refs.h"
#include "tree.h"
#include "userdiff.h"
#include "oid-array.h"
#include "revision.h"

static int compare_paths(const struct combine_diff_path *one,
        const struct diff_filespec *two)
{
  if (!S_ISDIR(one->mode) && !S_ISDIR(two->mode))
    return strcmp(one->path, two->path);

  return base_name_compare(one->path, strlen(one->path), one->mode,
         two->path, strlen(two->path), two->mode);
}

static int filename_changed(char status)
{
  return status == 'R' || status == 'C';
}

static struct combine_diff_path *intersect_paths(
  struct combine_diff_path *curr,
  int n,
  int num_parent,
  int combined_all_paths)
{
  struct diff_queue_struct *q = &diff_queued_diff;
  struct combine_diff_path *p, **tail = &curr;
  int i, j, cmp;

  if (!n) {
    for (i = 0; i < q->nr; i++) {
      if (diff_unmodified_pair(q->queue[i]))
        continue;
      p = combine_diff_path_new(q->queue[i]->two->path,
              strlen(q->queue[i]->two->path),
              q->queue[i]->two->mode,
              &q->queue[i]->two->oid,
              num_parent);
      oidcpy(&p->parent[n].oid, &q->queue[i]->one->oid);
      p->parent[n].mode = q->queue[i]->one->mode;
      p->parent[n].status = q->queue[i]->status;

      if (combined_all_paths &&
          filename_changed(p->parent[n].status)) {
        p->parent[n].path = xstrdup(q->queue[i]->one->path);
      }
      *tail = p;
      tail = &p->next;
    }
    return curr;
  }

  /*
   * paths in curr (linked list) and q->queue[] (array) are
   * both sorted in the tree order.
   */
  i = 0;
  while ((p = *tail) != NULL) {
    cmp = ((i >= q->nr)
           ? -1 : compare_paths(p, q->queue[i]->two));

    if (cmp < 0) {
      /* p->path not in q->queue[]; drop it */
      *tail = p->next;
      for (j = 0; j < num_parent; j++)
        free(p->parent[j].path);
      free(p);
      continue;
    }

    if (cmp > 0) {
      /* q->queue[i] not in p->path; skip it */
      i++;
      continue;
    }

    oidcpy(&p->parent[n].oid, &q->queue[i]->one->oid);
    p->parent[n].mode = q->queue[i]->one->mode;
    p->parent[n].status = q->queue[i]->status;
    if (combined_all_paths &&
        filename_changed(p->parent[n].status))
      p->parent[n].path = xstrdup(q->queue[i]->one->path);

    tail = &p->next;
    i++;
  }
  return curr;
}

/* Lines lost from parent */
struct lline {
  struct lline *next, *prev;
  int len;
  unsigned long parent_map;
  char line[FLEX_ARRAY];
};

/* Lines lost from current parent (before coalescing) */
struct plost {
  struct lline *lost_head, *lost_tail;
  int len;
};

/* Lines surviving in the merge result */
struct sline {
  /* Accumulated and coalesced lost lines */
  struct lline *lost;
  int lenlost;
  struct plost plost;
  char *bol;
  int len;
  /* bit 0 up to (N-1) are on if the parent has this line (i.e.
   * we did not change it).
   * bit N is used for "interesting" lines, including context.
   * bit (N+1) is used for "do not show deletion before this".
   */
  unsigned long flag;
  unsigned long *p_lno;
};

static int match_string_spaces(const char *line1, int len1,
             const char *line2, int len2,
             long flags)
{
  if (flags & XDF_WHITESPACE_FLAGS) {
    for (; len1 > 0 && XDL_ISSPACE(line1[len1 - 1]); len1--);
    for (; len2 > 0 && XDL_ISSPACE(line2[len2 - 1]); len2--);
  }

  if (!(flags & (XDF_IGNORE_WHITESPACE | XDF_IGNORE_WHITESPACE_CHANGE)))
    return (len1 == len2 && !memcmp(line1, line2, len1));

  while (len1 > 0 && len2 > 0) {
    len1--;
    len2--;
    if (XDL_ISSPACE(line1[len1]) || XDL_ISSPACE(line2[len2])) {
      if ((flags & XDF_IGNORE_WHITESPACE_CHANGE) &&
          (!XDL_ISSPACE(line1[len1]) || !XDL_ISSPACE(line2[len2])))
        return 0;

      for (; len1 > 0 && XDL_ISSPACE(line1[len1]); len1--);
      for (; len2 > 0 && XDL_ISSPACE(line2[len2]); len2--);
    }
    if (line1[len1] != line2[len2])
      return 0;
  }

  if (flags & XDF_IGNORE_WHITESPACE) {
    /* Consume remaining spaces */
    for (; len1 > 0 && XDL_ISSPACE(line1[len1 - 1]); len1--);
    for (; len2 > 0 && XDL_ISSPACE(line2[len2 - 1]); len2--);
  }

  /* We matched full line1 and line2 */
  if (!len1 && !len2)
    return 1;

  return 0;
}

enum coalesce_direction { MATCH, BASE, NEW };

/* Coalesce new lines into base by finding LCS */
static struct lline *coalesce_lines(struct lline *base, int *lenbase,
            struct lline *newline, int lennew,
            unsigned long parent, long flags)
{
  int **lcs;
  enum coalesce_direction **directions;
  struct lline *baseend, *newend = NULL;
  int i, j, origbaselen = *lenbase;

  if (!newline)
    return base;

  if (!base) {
    *lenbase = lennew;
    return newline;
  }

  /*
   * Coalesce new lines into base by finding the LCS
   * - Create the table to run dynamic programming
   * - Compute the LCS
   * - Then reverse read the direction structure:
   *   - If we have MATCH, assign parent to base flag, and consume
   *   both baseend and newend
   *   - Else if we have BASE, consume baseend
   *   - Else if we have NEW, insert newend lline into base and
   *   consume newend
   */
  CALLOC_ARRAY(lcs, st_add(origbaselen, 1));
  CALLOC_ARRAY(directions, st_add(origbaselen, 1));
  for (i = 0; i < origbaselen + 1; i++) {
    CALLOC_ARRAY(lcs[i], st_add(lennew, 1));
    CALLOC_ARRAY(directions[i], st_add(lennew, 1));
    directions[i][0] = BASE;
  }
  for (j = 1; j < lennew + 1; j++)
    directions[0][j] = NEW;

  for (i = 1, baseend = base; i < origbaselen + 1; i++) {
    for (j = 1, newend = newline; j < lennew + 1; j++) {
      if (match_string_spaces(baseend->line, baseend->len,
            newend->line, newend->len, flags)) {
        lcs[i][j] = lcs[i - 1][j - 1] + 1;
        directions[i][j] = MATCH;
      } else if (lcs[i][j - 1] >= lcs[i - 1][j]) {
        lcs[i][j] = lcs[i][j - 1];
        directions[i][j] = NEW;
      } else {
        lcs[i][j] = lcs[i - 1][j];
        directions[i][j] = BASE;
      }
      if (newend->next)
        newend = newend->next;
    }
    if (baseend->next)
      baseend = baseend->next;
  }

  for (i = 0; i < origbaselen + 1; i++)
    free(lcs[i]);
  free(lcs);

  /* At this point, baseend and newend point to the end of each lists */
  i--;
  j--;
  while (i != 0 || j != 0) {
    if (directions[i][j] == MATCH) {
      baseend->parent_map |= 1<<parent;
      baseend = baseend->prev;
      newend = newend->prev;
      i--;
      j--;
    } else if (directions[i][j] == NEW) {
      struct lline *lline;

      lline = newend;
      /* Remove lline from new list and update newend */
      if (lline->prev)
        lline->prev->next = lline->next;
      else
        newline = lline->next;
      if (lline->next)
        lline->next->prev = lline->prev;

      newend = lline->prev;
      j--;

      /* Add lline to base list */
      if (baseend) {
        lline->next = baseend->next;
        lline->prev = baseend;
        if (lline->prev)
          lline->prev->next = lline;
      }
      else {
        lline->next = base;
        base = lline;
      }
      (*lenbase)++;

      if (lline->next)
        lline->next->prev = lline;

    } else {
      baseend = baseend->prev;
      i--;
    }
  }

  newend = newline;
  while (newend) {
    struct lline *lline = newend;
    newend = newend->next;
    free(lline);
  }

  for (i = 0; i < origbaselen + 1; i++)
    free(directions[i]);
  free(directions);

  return base;
}

static char *grab_blob(struct repository *r,
           const struct object_id *oid, unsigned int mode,
           unsigned long *size, struct userdiff_driver *textconv,
           const char *path)
{
  char *blob;
  enum object_type type;

  if (S_ISGITLINK(mode)) {
    struct strbuf buf = STRBUF_INIT;
    strbuf_addf(&buf, "Subproject commit %s\n", oid_to_hex(oid));
    *size = buf.len;
    blob = strbuf_detach(&buf, NULL);
  } else if (is_null_oid(oid)) {
    /* deleted blob */
    *size = 0;
    return xcalloc(1, 1);
  } else if (textconv) {
    struct diff_filespec *df = alloc_filespec(path);
    fill_filespec(df, oid, 1, mode);
    *size = fill_textconv(r, textconv, df, &blob);
    free_filespec(df);
  } else {
    blob = odb_read_object(r->objects, oid, &type, size);
    if (!blob)
      die(_("unable to read %s"), oid_to_hex(oid));
    if (type != OBJ_BLOB)
      die("object '%s' is not a blob!", oid_to_hex(oid));
  }
  return blob;
}

static void append_lost(struct sline *sline, int n, const char *line, int len)
{
  struct lline *lline;
  unsigned long this_mask = (1UL<<n);
  if (line[len-1] == '\n')
    len--;

  FLEX_ALLOC_MEM(lline, line, line, len);
  lline->len = len;
  lline->next = NULL;
  lline->prev = sline->plost.lost_tail;
  if (lline->prev)
    lline->prev->next = lline;
  else
    sline->plost.lost_head = lline;
  sline->plost.lost_tail = lline;
  sline->plost.len++;
  lline->parent_map = this_mask;
}

struct combine_diff_state {
  unsigned int lno;
  int ob, on, nb, nn;
  unsigned long nmask;
  int num_parent;
  int n;
  struct sline *sline;
  struct sline *lost_bucket;
};

static void consume_hunk(void *state_,
       long ob, long on,
       long nb, long nn,
       const char *func UNUSED, long funclen UNUSED)
{
  struct combine_diff_state *state = state_;

  state->ob = ob;
  state->on = on;
  state->nb = nb;
  state->nn = nn;
  state->lno = state->nb;
  if (state->nn == 0) {
    /* @@ -X,Y +N,0 @@ removed Y lines
     * that would have come *after* line N
     * in the result.  Our lost buckets hang
     * to the line after the removed lines,
     *
     * Note that this is correct even when N == 0,
     * in which case the hunk removes the first
     * line in the file.
     */
    state->lost_bucket = &state->sline[state->nb];
    if (!state->nb)
      state->nb = 1;
  } else {
    state->lost_bucket = &state->sline[state->nb-1];
  }
  if (!state->sline[state->nb-1].p_lno)
    CALLOC_ARRAY(state->sline[state->nb - 1].p_lno,
           state->num_parent);
  state->sline[state->nb-1].p_lno[state->n] = state->ob;
}

static int consume_line(void *state_, char *line, unsigned long len)
{
  struct combine_diff_state *state = state_;
  if (!state->lost_bucket)
    return 0; /* not in any hunk yet */
  switch (line[0]) {
  case '-':
    append_lost(state->lost_bucket, state->n, line+1, len-1);
    break;
  case '+':
    state->sline[state->lno-1].flag |= state->nmask;
    state->lno++;
    break;
  }
  return 0;
}

static void combine_diff(struct repository *r,
       const struct object_id *parent, unsigned int mode,
       mmfile_t *result_file,
       struct sline *sline, unsigned int cnt, int n,
       int num_parent, int result_deleted,
       struct userdiff_driver *textconv,
       const char *path, long flags)
{
  unsigned int p_lno, lno;
  unsigned long nmask = (1UL << n);
  xpparam_t xpp;
  xdemitconf_t xecfg;
  mmfile_t parent_file;
  struct combine_diff_state state;
  unsigned long sz;

  if (result_deleted)
    return; /* result deleted */

  parent_file.ptr = grab_blob(r, parent, mode, &sz, textconv, path);
  parent_file.size = sz;
  memset(&xpp, 0, sizeof(xpp));
  xpp.flags = flags;
  memset(&xecfg, 0, sizeof(xecfg));
  memset(&state, 0, sizeof(state));
  state.nmask = nmask;
  state.sline = sline;
  state.lno = 1;
  state.num_parent = num_parent;
  state.n = n;

  if (xdi_diff_outf(&parent_file, result_file, consume_hunk,
        consume_line, &state, &xpp, &xecfg))
    die("unable to generate combined diff for %s",
        oid_to_hex(parent));
  free(parent_file.ptr);

  /* Assign line numbers for this parent.
   *
   * sline[lno].p_lno[n] records the first line number
   * (counting from 1) for parent N if the final hunk display
   * started by showing sline[lno] (possibly showing the lost
   * lines attached to it first).
   */
  for (lno = 0,  p_lno = 1; lno <= cnt; lno++) {
    struct lline *ll;
    sline[lno].p_lno[n] = p_lno;

    /* Coalesce new lines */
    if (sline[lno].plost.lost_head) {
      struct sline *sl = &sline[lno];
      sl->lost = coalesce_lines(sl->lost, &sl->lenlost,
              sl->plost.lost_head,
              sl->plost.len, n, flags);
      sl->plost.lost_head = sl->plost.lost_tail = NULL;
      sl->plost.len = 0;
    }

    /* How many lines would this sline advance the p_lno? */
    ll = sline[lno].lost;
    while (ll) {
      if (ll->parent_map & nmask)
        p_lno++; /* '-' means parent had it */
      ll = ll->next;
    }
    if (lno < cnt && !(sline[lno].flag & nmask))
      p_lno++; /* no '+' means parent had it */
  }
  sline[lno].p_lno[n] = p_lno; /* trailer */
}

static unsigned long context = 3;
static char combine_marker = '@';

static int interesting(struct sline *sline, unsigned long all_mask)
{
  /* If some parents lost lines here, or if we have added to
   * some parent, it is interesting.
   */
  return ((sline->flag & all_mask) || sline->lost);
}

static unsigned long adjust_hunk_tail(struct sline *sline,
              unsigned long all_mask,
              unsigned long hunk_begin,
              unsigned long i)
{
  /* i points at the first uninteresting line.  If the last line
   * of the hunk was interesting only because it has some
   * deletion, then it is not all that interesting for the
   * purpose of giving trailing context lines.  This is because
   * we output '-' line and then unmodified sline[i-1] itself in
   * that case which gives us one extra context line.
   */
  if ((hunk_begin + 1 <= i) && !(sline[i-1].flag & all_mask))
    i--;
  return i;
}

static unsigned long find_next(struct sline *sline,
             unsigned long mark,
             unsigned long i,
             unsigned long cnt,
             int look_for_uninteresting)
{
  /* We have examined up to i-1 and are about to look at i.
   * Find next interesting or uninteresting line.  Here,
   * "interesting" does not mean interesting(), but marked by
   * the give_context() function below (i.e. it includes context
   * lines that are not interesting to interesting() function
   * that are surrounded by interesting() ones.
   */
  while (i <= cnt)
    if (look_for_uninteresting
        ? !(sline[i].flag & mark)
        : (sline[i].flag & mark))
      return i;
    else
      i++;
  return i;
}

static int give_context(struct sline *sline, unsigned long cnt, int num_parent)
{
  unsigned long all_mask = (1UL<<num_parent) - 1;
  unsigned long mark = (1UL<<num_parent);
  unsigned long no_pre_delete = (2UL<<num_parent);
  unsigned long i;

  /* Two groups of interesting lines may have a short gap of
   * uninteresting lines.  Connect such groups to give them a
   * bit of context.
   *
   * We first start from what the interesting() function says,
   * and mark them with "mark", and paint context lines with the
   * mark.  So interesting() would still say false for such context
   * lines but they are treated as "interesting" in the end.
   */
  i = find_next(sline, mark, 0, cnt, 0);
  if (cnt < i)
    return 0;

  while (i <= cnt) {
    unsigned long j = (context < i) ? (i - context) : 0;
    unsigned long k;

    /* Paint a few lines before the first interesting line. */
    while (j < i) {
      if (!(sline[j].flag & mark))
        sline[j].flag |= no_pre_delete;
      sline[j++].flag |= mark;
    }

  again:
    /* we know up to i is to be included.  where does the
     * next uninteresting one start?
     */
    j = find_next(sline, mark, i, cnt, 1);
    if (cnt < j)
      break; /* the rest are all interesting */

    /* lookahead context lines */
    k = find_next(sline, mark, j, cnt, 0);
    j = adjust_hunk_tail(sline, all_mask, i, j);

    if (k < j + context) {
      /* k is interesting and [j,k) are not, but
       * paint them interesting because the gap is small.
       */
      while (j < k)
        sline[j++].flag |= mark;
      i = k;
      goto again;
    }

    /* j is the first uninteresting line and there is
     * no overlap beyond it within context lines.  Paint
     * the trailing edge a bit.
     */
    i = k;
    k = (j + context < cnt+1) ? j + context : cnt+1;
    while (j < k)
      sline[j++].flag |= mark;
  }
  return 1;
}

static int make_hunks(struct sline *sline, unsigned long cnt,
           int num_parent, int dense)
{
  unsigned long all_mask = (1UL<<num_parent) - 1;
  unsigned long mark = (1UL<<num_parent);
  unsigned long i;
  int has_interesting = 0;

  for (i = 0; i <= cnt; i++) {
    if (interesting(&sline[i], all_mask))
      sline[i].flag |= mark;
    else
      sline[i].flag &= ~mark;
  }
  if (!dense)
    return give_context(sline, cnt, num_parent);

  /* Look at each hunk, and if we have changes from only one
   * parent, or the changes are the same from all but one
   * parent, mark that uninteresting.
   */
  i = 0;
  while (i <= cnt) {
    unsigned long j, hunk_begin, hunk_end;
    unsigned long same_diff;
    while (i <= cnt && !(sline[i].flag & mark))
      i++;
    if (cnt < i)
      break; /* No more interesting hunks */
    hunk_begin = i;
    for (j = i + 1; j <= cnt; j++) {
      if (!(sline[j].flag & mark)) {
        /* Look beyond the end to see if there
         * is an interesting line after this
         * hunk within context span.
         */
        unsigned long la; /* lookahead */
        int contin = 0;
        la = adjust_hunk_tail(sline, all_mask,
                 hunk_begin, j);
        la = (la + context < cnt + 1) ?
          (la + context) : cnt + 1;
        while (la && j <= --la) {
          if (sline[la].flag & mark) {
            contin = 1;
            break;
          }
        }
        if (!contin)
          break;
        j = la;
      }
    }
    hunk_end = j;

    /* [i..hunk_end) are interesting.  Now is it really
     * interesting?  We check if there are only two versions
     * and the result matches one of them.  That is, we look
     * at:
     *   (+) line, which records lines added to which parents;
     *       this line appears in the result.
     *   (-) line, which records from what parents the line
     *       was removed; this line does not appear in the result.
     * then check the set of parents the result has difference
     * from, from all lines.  If there are lines that has
     * different set of parents that the result has differences
     * from, that means we have more than two versions.
     *
     * Even when we have only two versions, if the result does
     * not match any of the parents, the it should be considered
     * interesting.  In such a case, we would have all '+' line.
     * After passing the above "two versions" test, that would
     * appear as "the same set of parents" to be "all parents".
     */
    same_diff = 0;
    has_interesting = 0;
    for (j = i; j < hunk_end && !has_interesting; j++) {
      unsigned long this_diff = sline[j].flag & all_mask;
      struct lline *ll = sline[j].lost;
      if (this_diff) {
        /* This has some changes.  Is it the
         * same as others?
         */
        if (!same_diff)
          same_diff = this_diff;
        else if (same_diff != this_diff) {
          has_interesting = 1;
          break;
        }
      }
      while (ll && !has_interesting) {
        /* Lost this line from these parents;
         * who are they?  Are they the same?
         */
        this_diff = ll->parent_map;
        if (!same_diff)
          same_diff = this_diff;
        else if (same_diff != this_diff) {
          has_interesting = 1;
        }
        ll = ll->next;
      }
    }

    if (!has_interesting && same_diff != all_mask) {
      /* This hunk is not that interesting after all */
      for (j = hunk_begin; j < hunk_end; j++)
        sline[j].flag &= ~mark;
    }
    i = hunk_end;
  }

  has_interesting = give_context(sline, cnt, num_parent);
  return has_interesting;
}

static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, int n, unsigned long null_context)
{
  l0 = sline[l0].p_lno[n];
  l1 = sline[l1].p_lno[n];
  printf(" -%lu,%lu", l0, l1-l0-null_context);
}

static int hunk_comment_line(const char *bol)
{
  int ch;

  if (!bol)
    return 0;
  ch = *bol & 0xff;
  return (isalpha(ch) || ch == '_' || ch == '$');
}

static void show_line_to_eol(const char *line, int len, const char *reset)
{
  int saw_cr_at_eol = 0;
  if (len < 0)
    len = strlen(line);
  saw_cr_at_eol = (len && line[len-1] == '\r');

  printf("%.*s%s%s\n", len - saw_cr_at_eol, line,
         reset,
         saw_cr_at_eol ? "\r" : "");
}

static void dump_sline(struct sline *sline, const char *line_prefix,
           unsigned long cnt, int num_parent,
           enum git_colorbool use_color, int result_deleted)
{
  unsigned long mark = (1UL<<num_parent);
  unsigned long no_pre_delete = (2UL<<num_parent);
  int i;
  unsigned long lno = 0;
  const char *c_frag = diff_get_color(use_color, DIFF_FRAGINFO);
  const char *c_func = diff_get_color(use_color, DIFF_FUNCINFO);
  const char *c_new = diff_get_color(use_color, DIFF_FILE_NEW);
  const char *c_old = diff_get_color(use_color, DIFF_FILE_OLD);
  const char *c_context = diff_get_color(use_color, DIFF_CONTEXT);
  const char *c_reset = diff_get_color(use_color, DIFF_RESET);

  if (result_deleted)
    return; /* result deleted */

  while (1) {
    unsigned long hunk_end;
    unsigned long rlines;
    const char *hunk_comment = NULL;
    unsigned long null_context = 0;

    while (lno <= cnt && !(sline[lno].flag & mark)) {
      if (hunk_comment_line(sline[lno].bol))
        hunk_comment = sline[lno].bol;
      lno++;
    }
    if (cnt < lno)
      break;
    else {
      for (hunk_end = lno + 1; hunk_end <= cnt; hunk_end++)
        if (!(sline[hunk_end].flag & mark))
          break;
    }
    rlines = hunk_end - lno;
    if (cnt < hunk_end)
      rlines--; /* pointing at the last delete hunk */

    if (!context) {
      /*
       * Even when running with --unified=0, all
       * lines in the hunk needs to be processed in
       * the loop below in order to show the
       * deletion recorded in lost_head.  However,
       * we do not want to show the resulting line
       * with all blank context markers in such a
       * case.  Compensate.
       */
      unsigned long j;
      for (j = lno; j < hunk_end; j++)
        if (!(sline[j].flag & (mark-1)))
          null_context++;
      rlines -= null_context;
    }

    printf("%s%s", line_prefix, c_frag);
    for (i = 0; i <= num_parent; i++) putchar(combine_marker);
    for (i = 0; i < num_parent; i++)
      show_parent_lno(sline, lno, hunk_end, i, null_context);
    printf(" +%lu,%lu ", lno+1, rlines);
    for (i = 0; i <= num_parent; i++) putchar(combine_marker);

    if (hunk_comment) {
      int comment_end = 0;
      for (i = 0; i < 40; i++) {
        int ch = hunk_comment[i] & 0xff;
        if (!ch || ch == '\n')
          break;
        if (!isspace(ch))
            comment_end = i;
      }
      if (comment_end)
        printf("%s%s %s%s", c_reset,
                c_context, c_reset,
                c_func);
      for (i = 0; i < comment_end; i++)
        putchar(hunk_comment[i]);
    }

    printf("%s\n", c_reset);
    while (lno < hunk_end) {
      struct lline *ll;
      int j;
      unsigned long p_mask;
      struct sline *sl = &sline[lno++];
      ll = (sl->flag & no_pre_delete) ? NULL : sl->lost;
      while (ll) {
        printf("%s%s", line_prefix, c_old);
        for (j = 0; j < num_parent; j++) {
          if (ll->parent_map & (1UL<<j))
            putchar('-');
          else
            putchar(' ');
        }
        show_line_to_eol(ll->line, -1, c_reset);
        ll = ll->next;
      }
      if (cnt < lno)
        break;
      p_mask = 1;
      fputs(line_prefix, stdout);
      if (!(sl->flag & (mark-1))) {
        /*
         * This sline was here to hang the
         * lost lines in front of it.
         */
        if (!context)
          continue;
        fputs(c_context, stdout);
      }
      else
        fputs(c_new, stdout);
      for (j = 0; j < num_parent; j++) {
        if (p_mask & sl->flag)
          putchar('+');
        else
          putchar(' ');
        p_mask <<= 1;
      }
      show_line_to_eol(sl->bol, sl->len, c_reset);
    }
  }
}

static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
             int i, int j)
{
  /* We have already examined parent j and we know parent i
   * and parent j are the same, so reuse the combined result
   * of parent j for parent i.
   */
  unsigned long lno, imask, jmask;
  imask = (1UL<<i);
  jmask = (1UL<<j);

  for (lno = 0; lno <= cnt; lno++) {
    struct lline *ll = sline->lost;
    sline->p_lno[i] = sline->p_lno[j];
    while (ll) {
      if (ll->parent_map & jmask)
        ll->parent_map |= imask;
      ll = ll->next;
    }
    if (sline->flag & jmask)
      sline->flag |= imask;
    sline++;
  }
  /* the overall size of the file (sline[cnt]) */
  sline->p_lno[i] = sline->p_lno[j];
}

static void dump_quoted_path(const char *head,
           const char *prefix,
           const char *path,
           const char *line_prefix,
           const char *c_meta, const char *c_reset)
{
  static struct strbuf buf = STRBUF_INIT;

  strbuf_reset(&buf);
  strbuf_addstr(&buf, line_prefix);
  strbuf_addstr(&buf, c_meta);
  strbuf_addstr(&buf, head);
  quote_two_c_style(&buf, prefix, path, 0);
  strbuf_addstr(&buf, c_reset);
  puts(buf.buf);
}

static void show_combined_header(struct combine_diff_path *elem,
         int num_parent,
         struct rev_info *rev,
         const char *line_prefix,
         int mode_differs,
         int show_file_header)
{
  struct diff_options *opt = &rev->diffopt;
  int abbrev = opt->flags.full_index ? the_hash_algo->hexsz : DEFAULT_ABBREV;
  const char *a_prefix = opt->a_prefix ? opt->a_prefix : "a/";
  const char *b_prefix = opt->b_prefix ? opt->b_prefix : "b/";
  const char *c_meta = diff_get_color_opt(opt, DIFF_METAINFO);
  const char *c_reset = diff_get_color_opt(opt, DIFF_RESET);
  const char *abb;
  int added = 0;
  int deleted = 0;
  int i;
  int dense = rev->dense_combined_merges;

  if (rev->loginfo && !rev->no_commit_id)
    show_log(rev);

  dump_quoted_path(dense ? "diff --cc " : "diff --combined ",
       "", elem->path, line_prefix, c_meta, c_reset);
  printf("%s%sindex ", line_prefix, c_meta);
  for (i = 0; i < num_parent; i++) {
    abb = repo_find_unique_abbrev(the_repository,
                &elem->parent[i].oid, abbrev);
    printf("%s%s", i ? "," : "", abb);
  }
  abb = repo_find_unique_abbrev(the_repository, &elem->oid, abbrev);
  printf("..%s%s\n", abb, c_reset);

  if (mode_differs) {
    deleted = !elem->mode;

    /* We say it was added if nobody had it */
    added = !deleted;
    for (i = 0; added && i < num_parent; i++)
      if (elem->parent[i].status !=
          DIFF_STATUS_ADDED)
        added = 0;
    if (added)
      printf("%s%snew file mode %06o",
             line_prefix, c_meta, elem->mode);
    else {
      if (deleted)
        printf("%s%sdeleted file ",
               line_prefix, c_meta);
      printf("mode ");
      for (i = 0; i < num_parent; i++) {
        printf("%s%06o", i ? "," : "",
               elem->parent[i].mode);
      }
      if (elem->mode)
        printf("..%06o", elem->mode);
    }
    printf("%s\n", c_reset);
  }

  if (!show_file_header)
    return;

  if (rev->combined_all_paths) {
    for (i = 0; i < num_parent; i++) {
      const char *path = elem->parent[i].path ?
             elem->parent[i].path :
             elem->path;
      if (elem->parent[i].status == DIFF_STATUS_ADDED)
        dump_quoted_path("--- ", "", "/dev/null",
             line_prefix, c_meta, c_reset);
      else
        dump_quoted_path("--- ", a_prefix, path,
             line_prefix, c_meta, c_reset);
    }
  } else {
    if (added)
      dump_quoted_path("--- ", "", "/dev/null",
           line_prefix, c_meta, c_reset);
    else
      dump_quoted_path("--- ", a_prefix, elem->path,
           line_prefix, c_meta, c_reset);
  }
  if (deleted)
    dump_quoted_path("+++ ", "", "/dev/null",
         line_prefix, c_meta, c_reset);
  else
    dump_quoted_path("+++ ", b_prefix, elem->path,
         line_prefix, c_meta, c_reset);
}

static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
          int working_tree_file,
          struct rev_info *rev)
{
  struct diff_options *opt = &rev->diffopt;
  unsigned long result_size, cnt, lno;
  int result_deleted = 0;
  char *result, *cp;
  struct sline *sline; /* survived lines */
  int mode_differs = 0;
  int i, show_hunks;
  mmfile_t result_file;
  struct userdiff_driver *userdiff;
  struct userdiff_driver *textconv = NULL;
  int is_binary;
  const char *line_prefix = diff_line_prefix(opt);

  context = opt->context;
  userdiff = userdiff_find_by_path(opt->repo->index, elem->path);
  if (!userdiff)
    userdiff = userdiff_find_by_name("default");
  if (opt->flags.allow_textconv)
    textconv = userdiff_get_textconv(opt->repo, userdiff);

  /* Read the result of merge first */
  if (!working_tree_file)
    result = grab_blob(opt->repo, &elem->oid, elem->mode, &result_size,
           textconv, elem->path);
  else {
    /* Used by diff-tree to read from the working tree */
    struct stat st;
    int fd = -1;

    if (lstat(elem->path, &st) < 0)
      goto deleted_file;

    if (S_ISLNK(st.st_mode)) {
      struct strbuf buf = STRBUF_INIT;

      if (strbuf_readlink(&buf, elem->path, st.st_size) < 0) {
        error_errno("readlink(%s)", elem->path);
        return;
      }
      result_size = buf.len;
      result = strbuf_detach(&buf, NULL);
      elem->mode = canon_mode(st.st_mode);
    } else if (S_ISDIR(st.st_mode)) {
      struct object_id oid;
      if (repo_resolve_gitlink_ref(the_repository, elem->path,
                 "HEAD", &oid) < 0)
        result = grab_blob(opt->repo, &elem->oid,
               elem->mode, &result_size,
               NULL, NULL);
      else
        result = grab_blob(opt->repo, &oid, elem->mode,
               &result_size, NULL, NULL);
    } else if (textconv) {
      struct diff_filespec *df = alloc_filespec(elem->path);
      fill_filespec(df, null_oid(the_hash_algo), 0, st.st_mode);
      result_size = fill_textconv(opt->repo, textconv, df, &result);
      free_filespec(df);
    } else if (0 <= (fd = open(elem->path, O_RDONLY))) {
      size_t len = xsize_t(st.st_size);
      ssize_t done;
      int is_file, i;

      elem->mode = canon_mode(st.st_mode);
      /* if symlinks don't work, assume symlink if all parents
       * are symlinks
       */
      is_file = has_symlinks;
      for (i = 0; !is_file && i < num_parent; i++)
        is_file = !S_ISLNK(elem->parent[i].mode);
      if (!is_file)
        elem->mode = canon_mode(S_IFLNK);

      result_size = len;
      result = xmallocz(len);

      done = read_in_full(fd, result, len);
      if (done < 0)
        die_errno("read error '%s'", elem->path);
      else if (done < len)
        die("early EOF '%s'", elem->path);

      /* If not a fake symlink, apply filters, e.g. autocrlf */
      if (is_file) {
        struct strbuf buf = STRBUF_INIT;

        if (convert_to_git(rev->diffopt.repo->index,
               elem->path, result, len, &buf, global_conv_flags_eol)) {
          free(result);
          result = strbuf_detach(&buf, &len);
          result_size = len;
        }
      }
    }
    else {
    deleted_file:
      result_deleted = 1;
      result_size = 0;
      elem->mode = 0;
      result = xcalloc(1, 1);
    }

    if (0 <= fd)
      close(fd);
  }

  for (i = 0; i < num_parent; i++) {
    if (elem->parent[i].mode != elem->mode) {
      mode_differs = 1;
      break;
    }
  }

  if (textconv)
    is_binary = 0;
  else if (userdiff->binary != -1)
    is_binary = userdiff->binary;
  else {
    is_binary = buffer_is_binary(result, result_size);
    for (i = 0; !is_binary && i < num_parent; i++) {
      char *buf;
      unsigned long size;
      buf = grab_blob(opt->repo,
          &elem->parent[i].oid,
          elem->parent[i].mode,
          &size, NULL, NULL);
      if (buffer_is_binary(buf, size))
        is_binary = 1;
      free(buf);
    }
  }
  if (is_binary) {
    show_combined_header(elem, num_parent, rev,
             line_prefix, mode_differs, 0);
    printf("Binary files differ\n");
    free(result);
    return;
  }

  for (cnt = 0, cp = result; cp < result + result_size; cp++) {
    if (*cp == '\n')
      cnt++;
  }
  if (result_size && result[result_size-1] != '\n')
    cnt++; /* incomplete line */

  CALLOC_ARRAY(sline, st_add(cnt, 2));
  sline[0].bol = result;
  for (lno = 0, cp = result; cp < result + result_size; cp++) {
    if (*cp == '\n') {
      sline[lno].len = cp - sline[lno].bol;
      lno++;
      if (lno < cnt)
        sline[lno].bol = cp + 1;
    }
  }
  if (result_size && result[result_size-1] != '\n')
    sline[cnt-1].len = result_size - (sline[cnt-1].bol - result);

  result_file.ptr = result;
  result_file.size = result_size;

  /*
   * Even p_lno[cnt+1] is valid -- that is for the end line number
   * for deletion hunk at the end.
   */
  CALLOC_ARRAY(sline[0].p_lno, st_mult(st_add(cnt, 2), num_parent));
  for (lno = 0; lno <= cnt; lno++)
    sline[lno+1].p_lno = sline[lno].p_lno + num_parent;

  for (i = 0; i < num_parent; i++) {
    int j;
    for (j = 0; j < i; j++) {
      if (oideq(&elem->parent[i].oid,
          &elem->parent[j].oid)) {
        reuse_combine_diff(sline, cnt, i, j);
        break;
      }
    }
    if (i <= j)
      combine_diff(opt->repo,
             &elem->parent[i].oid,
             elem->parent[i].mode,
             &result_file, sline,
             cnt, i, num_parent, result_deleted,
             textconv, elem->path, opt->xdl_opts);
  }

  show_hunks = make_hunks(sline, cnt, num_parent, rev->dense_combined_merges);

  if (show_hunks || mode_differs || working_tree_file) {
    show_combined_header(elem, num_parent, rev,
             line_prefix, mode_differs, 1);
    dump_sline(sline, line_prefix, cnt, num_parent,
         opt->use_color, result_deleted);
  }
  free(result);

  for (lno = 0; lno < cnt + 2; lno++) {
    if (sline[lno].lost) {
      struct lline *ll = sline[lno].lost;
      while (ll) {
        struct lline *tmp = ll;
        ll = ll->next;
        free(tmp);
      }
    }
  }
  free(sline[0].p_lno);
  free(sline);
}

static void show_raw_diff(struct combine_diff_path *p, int num_parent, struct rev_info *rev)
{
  struct diff_options *opt = &rev->diffopt;
  int line_termination, inter_name_termination, i;
  const char *line_prefix = diff_line_prefix(opt);

  line_termination = opt->line_termination;
  inter_name_termination = '\t';
  if (!line_termination)
    inter_name_termination = 0;

  if (rev->loginfo && !rev->no_commit_id)
    show_log(rev);


  if (opt->output_format & DIFF_FORMAT_RAW) {
    printf("%s", line_prefix);

    /* As many colons as there are parents */
    for (i = 0; i < num_parent; i++)
      putchar(':');

    /* Show the modes */
    for (i = 0; i < num_parent; i++)
      printf("%06o ", p->parent[i].mode);
    printf("%06o", p->mode);

    /* Show sha1's */
    for (i = 0; i < num_parent; i++)
      printf(" %s", diff_aligned_abbrev(&p->parent[i].oid,
                opt->abbrev));
    printf(" %s ", diff_aligned_abbrev(&p->oid, opt->abbrev));
  }

  if (opt->output_format & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS)) {
    for (i = 0; i < num_parent; i++)
      putchar(p->parent[i].status);
    putchar(inter_name_termination);
  }

  for (i = 0; i < num_parent; i++)
    if (rev->combined_all_paths) {
      const char *path = p->parent[i].path ?
             p->parent[i].path :
             p->path;
      write_name_quoted(path, stdout, inter_name_termination);
    }
  write_name_quoted(p->path, stdout, line_termination);
}

/*
 * The result (p->elem) is from the working tree and their
 * parents are typically from multiple stages during a merge
 * (i.e. diff-files) or the state in HEAD and in the index
 * (i.e. diff-index).
 */
void show_combined_diff(struct combine_diff_path *p,
           int num_parent,
           struct rev_info *rev)
{
  struct diff_options *opt = &rev->diffopt;

  if (opt->output_format & (DIFF_FORMAT_RAW |
          DIFF_FORMAT_NAME |
          DIFF_FORMAT_NAME_STATUS))
    show_raw_diff(p, num_parent, rev);
  else if (opt->output_format & DIFF_FORMAT_PATCH)
    show_patch_diff(p, num_parent, 1, rev);
}

static void free_combined_pair(struct diff_filepair *pair)
{
  free(pair->two);
  free(pair);
}

/*
 * A combine_diff_path expresses N parents on the LHS against 1 merge
 * result. Synthesize a diff_filepair that has N entries on the "one"
 * side and 1 entry on the "two" side.
 *
 * In the future, we might want to add more data to combine_diff_path
 * so that we can fill fields we are ignoring (most notably, size) here,
 * but currently nobody uses it, so this should suffice for now.
 */
static struct diff_filepair *combined_pair(struct combine_diff_path *p,
             int num_parent)
{
  int i;
  struct diff_filepair *pair;
  struct diff_filespec *pool;

  CALLOC_ARRAY(pair, 1);
  CALLOC_ARRAY(pool, st_add(num_parent, 1));
  pair->one = pool + 1;
  pair->two = pool;

  for (i = 0; i < num_parent; i++) {
    pair->one[i].path = p->path;
    pair->one[i].mode = p->parent[i].mode;
    oidcpy(&pair->one[i].oid, &p->parent[i].oid);
    pair->one[i].oid_valid = !is_null_oid(&p->parent[i].oid);
    pair->one[i].has_more_entries = 1;
  }
  pair->one[num_parent - 1].has_more_entries = 0;

  pair->two->path = p->path;
  pair->two->mode = p->mode;
  oidcpy(&pair->two->oid, &p->oid);
  pair->two->oid_valid = !is_null_oid(&p->oid);
  return pair;
}

static void handle_combined_callback(struct diff_options *opt,
             struct combine_diff_path *paths,
             int num_parent,
             int num_paths)
{
  struct combine_diff_path *p;
  struct diff_queue_struct q;
  int i;

  CALLOC_ARRAY(q.queue, num_paths);
  q.alloc = num_paths;
  q.nr = num_paths;
  for (i = 0, p = paths; p; p = p->next)
    q.queue[i++] = combined_pair(p, num_parent);
  opt->format_callback(&q, opt, opt->format_callback_data);
  for (i = 0; i < num_paths; i++)
    free_combined_pair(q.queue[i]);
  free(q.queue);
}

static const char *path_path(void *obj)
{
  struct combine_diff_path *path = (struct combine_diff_path *)obj;

  return path->path;
}

/*
 * Diff stat formats which we always compute solely against the first parent.
 */
#define STAT_FORMAT_MASK (DIFF_FORMAT_NUMSTAT \
        | DIFF_FORMAT_SHORTSTAT \
        | DIFF_FORMAT_SUMMARY \
        | DIFF_FORMAT_DIRSTAT \
        | DIFF_FORMAT_DIFFSTAT)

/* find set of paths that every parent touches */
static struct combine_diff_path *find_paths_generic(const struct object_id *oid,
  const struct oid_array *parents,
  struct diff_options *opt,
  int combined_all_paths)
{
  struct combine_diff_path *paths = NULL;
  int i, num_parent = parents->nr;
  int output_format = opt->output_format;
  char *orderfile = opt->orderfile;

  opt->output_format = DIFF_FORMAT_NO_OUTPUT;
  /* tell diff_tree to emit paths in sorted (=tree) order */
  opt->orderfile = NULL;

  /* D(A,P1...Pn) = D(A,P1) ^ ... ^ D(A,Pn)  (wrt paths) */
  for (i = 0; i < num_parent; i++) {
    /*
     * show stat against the first parent even when doing
     * combined diff.
     */
    int stat_opt = output_format & STAT_FORMAT_MASK;
    if (i == 0 && stat_opt)
      opt->output_format = stat_opt;
    else
      opt->output_format = DIFF_FORMAT_NO_OUTPUT;
    diff_tree_oid(&parents->oid[i], oid, "", opt);
    diffcore_std(opt);
    paths = intersect_paths(paths, i, num_parent,
          combined_all_paths);

    /* if showing diff, show it in requested order */
    if (opt->output_format != DIFF_FORMAT_NO_OUTPUT &&
        orderfile) {
      diffcore_order(orderfile);
    }

    diff_flush(opt);
  }

  opt->output_format = output_format;
  opt->orderfile = orderfile;
  return paths;
}


/*
 * find set of paths that everybody touches, assuming diff is run without
 * rename/copy detection, etc, comparing all trees simultaneously (= faster).
 */
static struct combine_diff_path *find_paths_multitree(
  const struct object_id *oid, const struct oid_array *parents,
  struct diff_options *opt)
{
  int i, nparent = parents->nr;
  const struct object_id **parents_oid;
  struct combine_diff_path *paths;
  struct strbuf base;

  ALLOC_ARRAY(parents_oid, nparent);
  for (i = 0; i < nparent; i++)
    parents_oid[i] = &parents->oid[i];

  strbuf_init(&base, PATH_MAX);
  paths = diff_tree_paths(oid, parents_oid, nparent, &base, opt);

  strbuf_release(&base);
  free(parents_oid);
  return paths;
}

static int match_objfind(struct combine_diff_path *path,
       int num_parent,
       const struct oidset *set)
{
  int i;
  if (oidset_contains(set, &path->oid))
    return 1;
  for (i = 0; i < num_parent; i++) {
    if (oidset_contains(set, &path->parent[i].oid))
      return 1;
  }
  return 0;
}

static struct combine_diff_path *combined_objfind(struct diff_options *opt,
              struct combine_diff_path *paths,
              int num_parent)
{
  struct combine_diff_path *ret = NULL, **tail = &ret;
  struct combine_diff_path *p = paths;

  while (p) {
    struct combine_diff_path *next = p->next;

    if (match_objfind(p, num_parent, opt->objfind)) {
      p->next = NULL;
      *tail = p;
      tail = &p->next;
    } else {
      free(p);
    }
    p = next;
  }

  return ret;
}

void diff_tree_combined(const struct object_id *oid,
      const struct oid_array *parents,
      struct rev_info *rev)
{
  struct diff_options *opt = &rev->diffopt;
  struct diff_options diffopts;
  struct combine_diff_path *p, *paths;
  int i, num_paths, needsep, show_log_first, num_parent = parents->nr;
  int need_generic_pathscan;

  if (opt->ignore_regex_nr)
    die("combined diff and '%s' cannot be used together",
        "--ignore-matching-lines");
  if (opt->close_file)
    die("combined diff and '%s' cannot be used together",
        "--output");

  /* nothing to do, if no parents */
  if (!num_parent)
    return;

  show_log_first = !!rev->loginfo && !rev->no_commit_id;
  needsep = 0;
  if (show_log_first) {
    show_log(rev);

    if (rev->verbose_header && opt->output_format &&
        opt->output_format != DIFF_FORMAT_NO_OUTPUT &&
        !commit_format_is_empty(rev->commit_format))
      printf("%s%c", diff_line_prefix(opt),
             opt->line_termination);
  }

  diffopts = *opt;
  copy_pathspec(&diffopts.pathspec, &opt->pathspec);
  diffopts.flags.allow_external = 0;
  if (!opt->flags.no_recursive_diff_tree_combined)
    diffopts.flags.recursive = 1;

  /* find set of paths that everybody touches
   *
   * NOTE
   *
   * Diffcore transformations are bound to diff_filespec and logic
   * comparing two entries - i.e. they do not apply directly to combine
   * diff.
   *
   * If some of such transformations is requested - we launch generic
   * path scanning, which works significantly slower compared to
   * simultaneous all-trees-in-one-go scan in find_paths_multitree().
   *
   * TODO some of the filters could be ported to work on
   * combine_diff_paths - i.e. all functionality that skips paths, so in
   * theory, we could end up having only multitree path scanning.
   *
   * NOTE please keep this semantically in sync with diffcore_std()
   */
  need_generic_pathscan = opt->skip_stat_unmatch  ||
      opt->flags.follow_renames  ||
      opt->break_opt != -1  ||
      opt->detect_rename  ||
      (opt->pickaxe_opts &
       (DIFF_PICKAXE_KINDS_MASK & ~DIFF_PICKAXE_KIND_OBJFIND)) ||
      opt->filter;

  if (need_generic_pathscan) {
    /*
     * NOTE generic case also handles --stat, as it computes
     * diff(sha1,parent_i) for all i to do the job, specifically
     * for parent0.
     */
    paths = find_paths_generic(oid, parents, &diffopts,
             rev->combined_all_paths);
  }
  else {
    int stat_opt;
    paths = find_paths_multitree(oid, parents, &diffopts);

    if (opt->pickaxe_opts & DIFF_PICKAXE_KIND_OBJFIND)
      paths = combined_objfind(opt, paths, num_parent);

    /*
     * show stat against the first parent even
     * when doing combined diff.
     */
    stat_opt = opt->output_format & STAT_FORMAT_MASK;
    if (stat_opt) {
      diffopts.output_format = stat_opt;

      diff_tree_oid(&parents->oid[0], oid, "", &diffopts);
      diffcore_std(&diffopts);
      if (opt->orderfile)
        diffcore_order(opt->orderfile);
      diff_flush(&diffopts);
    }
  }

  /* find out number of surviving paths */
  for (num_paths = 0, p = paths; p; p = p->next)
    num_paths++;

  /* order paths according to diffcore_order */
  if (opt->orderfile && num_paths) {
    struct obj_order *o;

    ALLOC_ARRAY(o, num_paths);
    for (i = 0, p = paths; p; p = p->next, i++)
      o[i].obj = p;
    order_objects(opt->orderfile, path_path, o, num_paths);
    for (i = 0; i < num_paths - 1; i++) {
      p = o[i].obj;
      p->next = o[i+1].obj;
    }

    p = o[num_paths-1].obj;
    p->next = NULL;
    paths = o[0].obj;
    free(o);
  }


  if (num_paths) {
    if (opt->output_format & (DIFF_FORMAT_RAW |
            DIFF_FORMAT_NAME |
            DIFF_FORMAT_NAME_STATUS)) {
      for (p = paths; p; p = p->next)
        show_raw_diff(p, num_parent, rev);
      needsep = 1;
    }
    else if (opt->output_format & STAT_FORMAT_MASK)
      needsep = 1;
    else if (opt->output_format & DIFF_FORMAT_CALLBACK)
      handle_combined_callback(opt, paths, num_parent, num_paths);

    if (opt->output_format & DIFF_FORMAT_PATCH) {
      if (needsep)
        printf("%s%c", diff_line_prefix(opt),
               opt->line_termination);
      for (p = paths; p; p = p->next)
        show_patch_diff(p, num_parent, 0, rev);
    }
  }

  /* Clean things up */
  while (paths) {
    struct combine_diff_path *tmp = paths;
    paths = paths->next;
    for (i = 0; i < num_parent; i++)
      free(tmp->parent[i].path);
    free(tmp);
  }

  clear_pathspec(&diffopts.pathspec);
}

void diff_tree_combined_merge(const struct commit *commit,
            struct rev_info *rev)
{
  struct commit_list *parent = get_saved_parents(rev, commit);
  struct oid_array parents = OID_ARRAY_INIT;

  while (parent) {
    oid_array_append(&parents, &parent->item->object.oid);
    parent = parent->next;
  }
  diff_tree_combined(&commit->object.oid, &parents, rev);
  oid_array_clear(&parents);
}

struct combine_diff_path *combine_diff_path_new(const char *path,
            size_t path_len,
            unsigned int mode,
            const struct object_id *oid,
            size_t num_parents)
{
  struct combine_diff_path *p;
  size_t parent_len = st_mult(sizeof(p->parent[0]), num_parents);

  p = xmalloc(st_add4(sizeof(*p), path_len, 1, parent_len));
  p->path = (char *)&(p->parent[num_parents]);
  memcpy(p->path, path, path_len);
  p->path[path_len] = 0;
  p->next = NULL;
  p->mode = mode;
  oidcpy(&p->oid, oid);

  memset(p->parent, 0, parent_len);

  return p;
}

Coverage Report

Created: 2025-12-31 07:01