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10a20b43c3
An age-old corner case bug in combine diff (only triggered with -U0 and the hunk at the beginning of the file needs to be shown) has been fixed. By René Scharfe * rs/combine-diff-zero-context-at-the-beginning: combine-diff: fix loop index underflow
1212 lines
32 KiB
C
1212 lines
32 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "blob.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "quote.h"
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#include "xdiff-interface.h"
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#include "log-tree.h"
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#include "refs.h"
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#include "userdiff.h"
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#include "sha1-array.h"
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static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr, int n, int num_parent)
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{
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struct diff_queue_struct *q = &diff_queued_diff;
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struct combine_diff_path *p;
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int i;
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if (!n) {
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struct combine_diff_path *list = NULL, **tail = &list;
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for (i = 0; i < q->nr; i++) {
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int len;
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const char *path;
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if (diff_unmodified_pair(q->queue[i]))
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continue;
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path = q->queue[i]->two->path;
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len = strlen(path);
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p = xmalloc(combine_diff_path_size(num_parent, len));
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p->path = (char *) &(p->parent[num_parent]);
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memcpy(p->path, path, len);
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p->path[len] = 0;
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p->len = len;
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p->next = NULL;
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memset(p->parent, 0,
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sizeof(p->parent[0]) * num_parent);
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hashcpy(p->sha1, q->queue[i]->two->sha1);
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p->mode = q->queue[i]->two->mode;
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hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
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p->parent[n].mode = q->queue[i]->one->mode;
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p->parent[n].status = q->queue[i]->status;
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*tail = p;
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tail = &p->next;
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}
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return list;
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}
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for (p = curr; p; p = p->next) {
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int found = 0;
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if (!p->len)
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continue;
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for (i = 0; i < q->nr; i++) {
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const char *path;
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int len;
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if (diff_unmodified_pair(q->queue[i]))
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continue;
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path = q->queue[i]->two->path;
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len = strlen(path);
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if (len == p->len && !memcmp(path, p->path, len)) {
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found = 1;
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hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
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p->parent[n].mode = q->queue[i]->one->mode;
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p->parent[n].status = q->queue[i]->status;
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break;
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}
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}
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if (!found)
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p->len = 0;
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}
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return curr;
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}
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/* Lines lost from parent */
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struct lline {
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struct lline *next;
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int len;
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unsigned long parent_map;
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char line[FLEX_ARRAY];
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};
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/* Lines surviving in the merge result */
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struct sline {
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struct lline *lost_head, **lost_tail;
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struct lline *next_lost;
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char *bol;
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int len;
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/* bit 0 up to (N-1) are on if the parent has this line (i.e.
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* we did not change it).
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* bit N is used for "interesting" lines, including context.
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* bit (N+1) is used for "do not show deletion before this".
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*/
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unsigned long flag;
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unsigned long *p_lno;
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};
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static char *grab_blob(const unsigned char *sha1, unsigned int mode,
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unsigned long *size, struct userdiff_driver *textconv,
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const char *path)
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{
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char *blob;
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enum object_type type;
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if (S_ISGITLINK(mode)) {
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blob = xmalloc(100);
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*size = snprintf(blob, 100,
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"Subproject commit %s\n", sha1_to_hex(sha1));
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} else if (is_null_sha1(sha1)) {
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/* deleted blob */
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*size = 0;
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return xcalloc(1, 1);
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} else if (textconv) {
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struct diff_filespec *df = alloc_filespec(path);
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fill_filespec(df, sha1, mode);
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*size = fill_textconv(textconv, df, &blob);
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free_filespec(df);
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} else {
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blob = read_sha1_file(sha1, &type, size);
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if (type != OBJ_BLOB)
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die("object '%s' is not a blob!", sha1_to_hex(sha1));
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}
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return blob;
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}
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static void append_lost(struct sline *sline, int n, const char *line, int len)
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{
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struct lline *lline;
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unsigned long this_mask = (1UL<<n);
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if (line[len-1] == '\n')
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len--;
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/* Check to see if we can squash things */
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if (sline->lost_head) {
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lline = sline->next_lost;
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while (lline) {
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if (lline->len == len &&
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!memcmp(lline->line, line, len)) {
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lline->parent_map |= this_mask;
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sline->next_lost = lline->next;
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return;
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}
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lline = lline->next;
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}
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}
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lline = xmalloc(sizeof(*lline) + len + 1);
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lline->len = len;
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lline->next = NULL;
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lline->parent_map = this_mask;
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memcpy(lline->line, line, len);
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lline->line[len] = 0;
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*sline->lost_tail = lline;
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sline->lost_tail = &lline->next;
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sline->next_lost = NULL;
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}
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struct combine_diff_state {
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unsigned int lno;
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int ob, on, nb, nn;
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unsigned long nmask;
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int num_parent;
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int n;
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struct sline *sline;
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struct sline *lost_bucket;
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};
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static void consume_line(void *state_, char *line, unsigned long len)
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{
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struct combine_diff_state *state = state_;
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if (5 < len && !memcmp("@@ -", line, 4)) {
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if (parse_hunk_header(line, len,
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&state->ob, &state->on,
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&state->nb, &state->nn))
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return;
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state->lno = state->nb;
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if (state->nn == 0) {
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/* @@ -X,Y +N,0 @@ removed Y lines
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* that would have come *after* line N
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* in the result. Our lost buckets hang
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* to the line after the removed lines,
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*
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* Note that this is correct even when N == 0,
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* in which case the hunk removes the first
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* line in the file.
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*/
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state->lost_bucket = &state->sline[state->nb];
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if (!state->nb)
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state->nb = 1;
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} else {
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state->lost_bucket = &state->sline[state->nb-1];
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}
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if (!state->sline[state->nb-1].p_lno)
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state->sline[state->nb-1].p_lno =
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xcalloc(state->num_parent,
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sizeof(unsigned long));
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state->sline[state->nb-1].p_lno[state->n] = state->ob;
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state->lost_bucket->next_lost = state->lost_bucket->lost_head;
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return;
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}
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if (!state->lost_bucket)
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return; /* not in any hunk yet */
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switch (line[0]) {
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case '-':
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append_lost(state->lost_bucket, state->n, line+1, len-1);
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break;
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case '+':
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state->sline[state->lno-1].flag |= state->nmask;
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state->lno++;
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break;
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}
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}
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static void combine_diff(const unsigned char *parent, unsigned int mode,
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mmfile_t *result_file,
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struct sline *sline, unsigned int cnt, int n,
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int num_parent, int result_deleted,
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struct userdiff_driver *textconv,
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const char *path)
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{
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unsigned int p_lno, lno;
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unsigned long nmask = (1UL << n);
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xpparam_t xpp;
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xdemitconf_t xecfg;
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mmfile_t parent_file;
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struct combine_diff_state state;
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unsigned long sz;
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if (result_deleted)
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return; /* result deleted */
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parent_file.ptr = grab_blob(parent, mode, &sz, textconv, path);
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parent_file.size = sz;
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memset(&xpp, 0, sizeof(xpp));
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xpp.flags = 0;
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memset(&xecfg, 0, sizeof(xecfg));
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memset(&state, 0, sizeof(state));
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state.nmask = nmask;
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state.sline = sline;
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state.lno = 1;
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state.num_parent = num_parent;
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state.n = n;
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xdi_diff_outf(&parent_file, result_file, consume_line, &state,
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&xpp, &xecfg);
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free(parent_file.ptr);
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/* Assign line numbers for this parent.
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*
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* sline[lno].p_lno[n] records the first line number
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* (counting from 1) for parent N if the final hunk display
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* started by showing sline[lno] (possibly showing the lost
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* lines attached to it first).
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*/
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for (lno = 0, p_lno = 1; lno <= cnt; lno++) {
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struct lline *ll;
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sline[lno].p_lno[n] = p_lno;
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/* How many lines would this sline advance the p_lno? */
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ll = sline[lno].lost_head;
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while (ll) {
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if (ll->parent_map & nmask)
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p_lno++; /* '-' means parent had it */
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ll = ll->next;
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}
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if (lno < cnt && !(sline[lno].flag & nmask))
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p_lno++; /* no '+' means parent had it */
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}
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sline[lno].p_lno[n] = p_lno; /* trailer */
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}
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static unsigned long context = 3;
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static char combine_marker = '@';
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static int interesting(struct sline *sline, unsigned long all_mask)
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{
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/* If some parents lost lines here, or if we have added to
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* some parent, it is interesting.
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*/
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return ((sline->flag & all_mask) || sline->lost_head);
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}
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static unsigned long adjust_hunk_tail(struct sline *sline,
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unsigned long all_mask,
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unsigned long hunk_begin,
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unsigned long i)
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{
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/* i points at the first uninteresting line. If the last line
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* of the hunk was interesting only because it has some
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* deletion, then it is not all that interesting for the
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* purpose of giving trailing context lines. This is because
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* we output '-' line and then unmodified sline[i-1] itself in
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* that case which gives us one extra context line.
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*/
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if ((hunk_begin + 1 <= i) && !(sline[i-1].flag & all_mask))
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i--;
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return i;
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}
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static unsigned long find_next(struct sline *sline,
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unsigned long mark,
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unsigned long i,
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unsigned long cnt,
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int look_for_uninteresting)
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{
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/* We have examined up to i-1 and are about to look at i.
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* Find next interesting or uninteresting line. Here,
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* "interesting" does not mean interesting(), but marked by
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* the give_context() function below (i.e. it includes context
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* lines that are not interesting to interesting() function
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* that are surrounded by interesting() ones.
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*/
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while (i <= cnt)
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if (look_for_uninteresting
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? !(sline[i].flag & mark)
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: (sline[i].flag & mark))
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return i;
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else
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i++;
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return i;
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}
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static int give_context(struct sline *sline, unsigned long cnt, int num_parent)
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{
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unsigned long all_mask = (1UL<<num_parent) - 1;
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unsigned long mark = (1UL<<num_parent);
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unsigned long no_pre_delete = (2UL<<num_parent);
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unsigned long i;
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/* Two groups of interesting lines may have a short gap of
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* uninteresting lines. Connect such groups to give them a
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* bit of context.
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*
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* We first start from what the interesting() function says,
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* and mark them with "mark", and paint context lines with the
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* mark. So interesting() would still say false for such context
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* lines but they are treated as "interesting" in the end.
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*/
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i = find_next(sline, mark, 0, cnt, 0);
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if (cnt < i)
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return 0;
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while (i <= cnt) {
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unsigned long j = (context < i) ? (i - context) : 0;
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unsigned long k;
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/* Paint a few lines before the first interesting line. */
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while (j < i)
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sline[j++].flag |= mark | no_pre_delete;
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again:
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/* we know up to i is to be included. where does the
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* next uninteresting one start?
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*/
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j = find_next(sline, mark, i, cnt, 1);
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if (cnt < j)
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break; /* the rest are all interesting */
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/* lookahead context lines */
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k = find_next(sline, mark, j, cnt, 0);
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j = adjust_hunk_tail(sline, all_mask, i, j);
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if (k < j + context) {
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/* k is interesting and [j,k) are not, but
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* paint them interesting because the gap is small.
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*/
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while (j < k)
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sline[j++].flag |= mark;
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i = k;
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goto again;
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}
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/* j is the first uninteresting line and there is
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* no overlap beyond it within context lines. Paint
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* the trailing edge a bit.
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*/
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i = k;
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k = (j + context < cnt+1) ? j + context : cnt+1;
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while (j < k)
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sline[j++].flag |= mark;
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}
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return 1;
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}
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static int make_hunks(struct sline *sline, unsigned long cnt,
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int num_parent, int dense)
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{
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unsigned long all_mask = (1UL<<num_parent) - 1;
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unsigned long mark = (1UL<<num_parent);
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unsigned long i;
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int has_interesting = 0;
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for (i = 0; i <= cnt; i++) {
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if (interesting(&sline[i], all_mask))
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sline[i].flag |= mark;
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else
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sline[i].flag &= ~mark;
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}
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if (!dense)
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return give_context(sline, cnt, num_parent);
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/* Look at each hunk, and if we have changes from only one
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* parent, or the changes are the same from all but one
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* parent, mark that uninteresting.
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*/
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i = 0;
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while (i <= cnt) {
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unsigned long j, hunk_begin, hunk_end;
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unsigned long same_diff;
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while (i <= cnt && !(sline[i].flag & mark))
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i++;
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if (cnt < i)
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break; /* No more interesting hunks */
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hunk_begin = i;
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for (j = i + 1; j <= cnt; j++) {
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if (!(sline[j].flag & mark)) {
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/* Look beyond the end to see if there
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* is an interesting line after this
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* hunk within context span.
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*/
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unsigned long la; /* lookahead */
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int contin = 0;
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la = adjust_hunk_tail(sline, all_mask,
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hunk_begin, j);
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la = (la + context < cnt + 1) ?
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(la + context) : cnt + 1;
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while (la && j <= --la) {
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if (sline[la].flag & mark) {
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contin = 1;
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break;
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}
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}
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if (!contin)
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break;
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j = la;
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}
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}
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hunk_end = j;
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/* [i..hunk_end) are interesting. Now is it really
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* interesting? We check if there are only two versions
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* and the result matches one of them. That is, we look
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* at:
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* (+) line, which records lines added to which parents;
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* this line appears in the result.
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* (-) line, which records from what parents the line
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* was removed; this line does not appear in the result.
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* then check the set of parents the result has difference
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* from, from all lines. If there are lines that has
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* different set of parents that the result has differences
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* from, that means we have more than two versions.
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*
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* Even when we have only two versions, if the result does
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* not match any of the parents, the it should be considered
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* interesting. In such a case, we would have all '+' line.
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* After passing the above "two versions" test, that would
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* appear as "the same set of parents" to be "all parents".
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*/
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same_diff = 0;
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has_interesting = 0;
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for (j = i; j < hunk_end && !has_interesting; j++) {
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unsigned long this_diff = sline[j].flag & all_mask;
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struct lline *ll = sline[j].lost_head;
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if (this_diff) {
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/* This has some changes. Is it the
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* same as others?
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*/
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if (!same_diff)
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same_diff = this_diff;
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else if (same_diff != this_diff) {
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has_interesting = 1;
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break;
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}
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}
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while (ll && !has_interesting) {
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/* Lost this line from these parents;
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* who are they? Are they the same?
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*/
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this_diff = ll->parent_map;
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if (!same_diff)
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same_diff = this_diff;
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else if (same_diff != this_diff) {
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has_interesting = 1;
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}
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ll = ll->next;
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}
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}
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if (!has_interesting && same_diff != all_mask) {
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/* This hunk is not that interesting after all */
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for (j = hunk_begin; j < hunk_end; j++)
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sline[j].flag &= ~mark;
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}
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i = hunk_end;
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}
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has_interesting = give_context(sline, cnt, num_parent);
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return has_interesting;
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}
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|
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static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, int n, unsigned long null_context)
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{
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l0 = sline[l0].p_lno[n];
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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, unsigned long cnt, int num_parent,
|
|
int 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_plain = diff_get_color(use_color, DIFF_PLAIN);
|
|
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;
|
|
}
|
|
|
|
fputs(c_frag, stdout);
|
|
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_plain, 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_head;
|
|
while (ll) {
|
|
fputs(c_old, stdout);
|
|
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;
|
|
if (!(sl->flag & (mark-1))) {
|
|
/*
|
|
* This sline was here to hang the
|
|
* lost lines in front of it.
|
|
*/
|
|
if (!context)
|
|
continue;
|
|
fputs(c_plain, 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_head;
|
|
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 *c_meta, const char *c_reset)
|
|
{
|
|
static struct strbuf buf = STRBUF_INIT;
|
|
|
|
strbuf_reset(&buf);
|
|
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,
|
|
int dense,
|
|
struct rev_info *rev,
|
|
int mode_differs,
|
|
int show_file_header)
|
|
{
|
|
struct diff_options *opt = &rev->diffopt;
|
|
int abbrev = DIFF_OPT_TST(opt, FULL_INDEX) ? 40 : 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;
|
|
|
|
if (rev->loginfo && !rev->no_commit_id)
|
|
show_log(rev);
|
|
|
|
dump_quoted_path(dense ? "diff --cc " : "diff --combined ",
|
|
"", elem->path, c_meta, c_reset);
|
|
printf("%sindex ", c_meta);
|
|
for (i = 0; i < num_parent; i++) {
|
|
abb = find_unique_abbrev(elem->parent[i].sha1,
|
|
abbrev);
|
|
printf("%s%s", i ? "," : "", abb);
|
|
}
|
|
abb = find_unique_abbrev(elem->sha1, 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("%snew file mode %06o",
|
|
c_meta, elem->mode);
|
|
else {
|
|
if (deleted)
|
|
printf("%sdeleted file ", 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 (added)
|
|
dump_quoted_path("--- ", "", "/dev/null",
|
|
c_meta, c_reset);
|
|
else
|
|
dump_quoted_path("--- ", a_prefix, elem->path,
|
|
c_meta, c_reset);
|
|
if (deleted)
|
|
dump_quoted_path("+++ ", "", "/dev/null",
|
|
c_meta, c_reset);
|
|
else
|
|
dump_quoted_path("+++ ", b_prefix, elem->path,
|
|
c_meta, c_reset);
|
|
}
|
|
|
|
static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
|
|
int dense, 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;
|
|
|
|
context = opt->context;
|
|
userdiff = userdiff_find_by_path(elem->path);
|
|
if (!userdiff)
|
|
userdiff = userdiff_find_by_name("default");
|
|
if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV))
|
|
textconv = userdiff_get_textconv(userdiff);
|
|
|
|
/* Read the result of merge first */
|
|
if (!working_tree_file)
|
|
result = grab_blob(elem->sha1, 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("readlink(%s): %s", elem->path,
|
|
strerror(errno));
|
|
return;
|
|
}
|
|
result_size = buf.len;
|
|
result = strbuf_detach(&buf, NULL);
|
|
elem->mode = canon_mode(st.st_mode);
|
|
} else if (S_ISDIR(st.st_mode)) {
|
|
unsigned char sha1[20];
|
|
if (resolve_gitlink_ref(elem->path, "HEAD", sha1) < 0)
|
|
result = grab_blob(elem->sha1, elem->mode,
|
|
&result_size, NULL, NULL);
|
|
else
|
|
result = grab_blob(sha1, elem->mode,
|
|
&result_size, NULL, NULL);
|
|
} else if (textconv) {
|
|
struct diff_filespec *df = alloc_filespec(elem->path);
|
|
fill_filespec(df, null_sha1, st.st_mode);
|
|
result_size = fill_textconv(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 = xmalloc(len + 1);
|
|
|
|
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);
|
|
|
|
result[len] = 0;
|
|
|
|
/* If not a fake symlink, apply filters, e.g. autocrlf */
|
|
if (is_file) {
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
if (convert_to_git(elem->path, result, len, &buf, safe_crlf)) {
|
|
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(elem->parent[i].sha1,
|
|
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, dense, rev,
|
|
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 */
|
|
|
|
sline = xcalloc(cnt+2, sizeof(*sline));
|
|
sline[0].bol = result;
|
|
for (lno = 0; lno <= cnt + 1; lno++) {
|
|
sline[lno].lost_tail = &sline[lno].lost_head;
|
|
sline[lno].flag = 0;
|
|
}
|
|
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.
|
|
*/
|
|
sline[0].p_lno = xcalloc((cnt+2) * num_parent, sizeof(unsigned long));
|
|
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 (!hashcmp(elem->parent[i].sha1,
|
|
elem->parent[j].sha1)) {
|
|
reuse_combine_diff(sline, cnt, i, j);
|
|
break;
|
|
}
|
|
}
|
|
if (i <= j)
|
|
combine_diff(elem->parent[i].sha1,
|
|
elem->parent[i].mode,
|
|
&result_file, sline,
|
|
cnt, i, num_parent, result_deleted,
|
|
textconv, elem->path);
|
|
}
|
|
|
|
show_hunks = make_hunks(sline, cnt, num_parent, dense);
|
|
|
|
if (show_hunks || mode_differs || working_tree_file) {
|
|
show_combined_header(elem, num_parent, dense, rev,
|
|
mode_differs, 1);
|
|
dump_sline(sline, cnt, num_parent,
|
|
opt->use_color, result_deleted);
|
|
}
|
|
free(result);
|
|
|
|
for (lno = 0; lno < cnt; lno++) {
|
|
if (sline[lno].lost_head) {
|
|
struct lline *ll = sline[lno].lost_head;
|
|
while (ll) {
|
|
struct lline *tmp = ll;
|
|
ll = ll->next;
|
|
free(tmp);
|
|
}
|
|
}
|
|
}
|
|
free(sline[0].p_lno);
|
|
free(sline);
|
|
}
|
|
|
|
#define COLONS "::::::::::::::::::::::::::::::::"
|
|
|
|
static void show_raw_diff(struct combine_diff_path *p, int num_parent, struct rev_info *rev)
|
|
{
|
|
struct diff_options *opt = &rev->diffopt;
|
|
int i, offset;
|
|
const char *prefix;
|
|
int line_termination, inter_name_termination;
|
|
|
|
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) {
|
|
offset = strlen(COLONS) - num_parent;
|
|
if (offset < 0)
|
|
offset = 0;
|
|
prefix = COLONS + offset;
|
|
|
|
/* Show the modes */
|
|
for (i = 0; i < num_parent; i++) {
|
|
printf("%s%06o", prefix, p->parent[i].mode);
|
|
prefix = " ";
|
|
}
|
|
printf("%s%06o", prefix, p->mode);
|
|
|
|
/* Show sha1's */
|
|
for (i = 0; i < num_parent; i++)
|
|
printf(" %s", diff_unique_abbrev(p->parent[i].sha1,
|
|
opt->abbrev));
|
|
printf(" %s ", diff_unique_abbrev(p->sha1, 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);
|
|
}
|
|
|
|
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,
|
|
int dense,
|
|
struct rev_info *rev)
|
|
{
|
|
struct diff_options *opt = &rev->diffopt;
|
|
if (!p->len)
|
|
return;
|
|
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, dense, 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;
|
|
|
|
pair = xmalloc(sizeof(*pair));
|
|
pool = xcalloc(num_parent + 1, sizeof(struct diff_filespec));
|
|
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;
|
|
hashcpy(pair->one[i].sha1, p->parent[i].sha1);
|
|
pair->one[i].sha1_valid = !is_null_sha1(p->parent[i].sha1);
|
|
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;
|
|
hashcpy(pair->two->sha1, p->sha1);
|
|
pair->two->sha1_valid = !is_null_sha1(p->sha1);
|
|
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;
|
|
|
|
q.queue = xcalloc(num_paths, sizeof(struct diff_filepair *));
|
|
q.alloc = num_paths;
|
|
q.nr = num_paths;
|
|
for (i = 0, p = paths; p; p = p->next) {
|
|
if (!p->len)
|
|
continue;
|
|
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);
|
|
}
|
|
|
|
void diff_tree_combined(const unsigned char *sha1,
|
|
const struct sha1_array *parents,
|
|
int dense,
|
|
struct rev_info *rev)
|
|
{
|
|
struct diff_options *opt = &rev->diffopt;
|
|
struct diff_options diffopts;
|
|
struct combine_diff_path *p, *paths = NULL;
|
|
int i, num_paths, needsep, show_log_first, num_parent = parents->nr;
|
|
|
|
diffopts = *opt;
|
|
diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
|
DIFF_OPT_SET(&diffopts, RECURSIVE);
|
|
DIFF_OPT_CLR(&diffopts, ALLOW_EXTERNAL);
|
|
|
|
show_log_first = !!rev->loginfo && !rev->no_commit_id;
|
|
needsep = 0;
|
|
/* find set of paths that everybody touches */
|
|
for (i = 0; i < num_parent; i++) {
|
|
/* show stat against the first parent even
|
|
* when doing combined diff.
|
|
*/
|
|
int stat_opt = (opt->output_format &
|
|
(DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT));
|
|
if (i == 0 && stat_opt)
|
|
diffopts.output_format = stat_opt;
|
|
else
|
|
diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
|
|
diff_tree_sha1(parents->sha1[i], sha1, "", &diffopts);
|
|
diffcore_std(&diffopts);
|
|
paths = intersect_paths(paths, i, num_parent);
|
|
|
|
if (show_log_first && i == 0) {
|
|
show_log(rev);
|
|
if (rev->verbose_header && opt->output_format)
|
|
putchar(opt->line_termination);
|
|
}
|
|
diff_flush(&diffopts);
|
|
}
|
|
|
|
/* find out surviving paths */
|
|
for (num_paths = 0, p = paths; p; p = p->next) {
|
|
if (p->len)
|
|
num_paths++;
|
|
}
|
|
if (num_paths) {
|
|
if (opt->output_format & (DIFF_FORMAT_RAW |
|
|
DIFF_FORMAT_NAME |
|
|
DIFF_FORMAT_NAME_STATUS)) {
|
|
for (p = paths; p; p = p->next) {
|
|
if (p->len)
|
|
show_raw_diff(p, num_parent, rev);
|
|
}
|
|
needsep = 1;
|
|
}
|
|
else if (opt->output_format &
|
|
(DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT))
|
|
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)
|
|
putchar(opt->line_termination);
|
|
for (p = paths; p; p = p->next) {
|
|
if (p->len)
|
|
show_patch_diff(p, num_parent, dense,
|
|
0, rev);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Clean things up */
|
|
while (paths) {
|
|
struct combine_diff_path *tmp = paths;
|
|
paths = paths->next;
|
|
free(tmp);
|
|
}
|
|
}
|
|
|
|
void diff_tree_combined_merge(const struct commit *commit, int dense,
|
|
struct rev_info *rev)
|
|
{
|
|
struct commit_list *parent = commit->parents;
|
|
struct sha1_array parents = SHA1_ARRAY_INIT;
|
|
|
|
while (parent) {
|
|
sha1_array_append(&parents, parent->item->object.sha1);
|
|
parent = parent->next;
|
|
}
|
|
diff_tree_combined(commit->object.sha1, &parents, dense, rev);
|
|
sha1_array_clear(&parents);
|
|
}
|