X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=diff.c;h=3dc0ca0a0334b2ed5492d67d759c4bffad5cd404;hb=9048fe1c50499d562dcf73094f173b12bdb084c4;hp=4a4b62191284a2289631c01b3a2885387f59a8c0;hpb=89ab859e9452cbc8f1f15afab52257e9b789c899;p=git.git

diff --git a/diff.c b/diff.c
index 4a4b6219..3dc0ca0a 100644
--- a/diff.c
+++ b/diff.c
@@ -19,6 +19,7 @@ static const char *external_diff(void)
 {
 	static const char *external_diff_cmd = NULL;
 	static int done_preparing = 0;
+	const char *env_diff_opts;
 
 	if (done_preparing)
 		return external_diff_cmd;
@@ -31,21 +32,23 @@ static const char *external_diff(void)
 	 *
 	 * GIT_DIFF_OPTS="-c";
 	 */
-	if (gitenv("GIT_EXTERNAL_DIFF"))
-		external_diff_cmd = gitenv("GIT_EXTERNAL_DIFF");
+	external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
 
 	/* In case external diff fails... */
-	diff_opts = gitenv("GIT_DIFF_OPTS") ? : diff_opts;
+	env_diff_opts = getenv("GIT_DIFF_OPTS");
+	if (env_diff_opts) diff_opts = env_diff_opts;
 
 	done_preparing = 1;
 	return external_diff_cmd;
 }
 
+#define TEMPFILE_PATH_LEN		50
+
 static struct diff_tempfile {
 	const char *name; /* filename external diff should read from */
 	char hex[41];
 	char mode[10];
-	char tmp_path[50];
+	char tmp_path[TEMPFILE_PATH_LEN];
 } diff_temp[2];
 
 static int count_lines(const char *filename)
@@ -132,8 +135,8 @@ static void builtin_diff(const char *name_a,
 			 int complete_rewrite)
 {
 	int i, next_at, cmd_size;
-	const char *diff_cmd = "diff -L%s%s -L%s%s";
-	const char *diff_arg  = "%s %s||:"; /* "||:" is to return 0 */
+	const char *const diff_cmd = "diff -L%s%s -L%s%s";
+	const char *const diff_arg  = "%s %s||:"; /* "||:" is to return 0 */
 	const char *input_name_sq[2];
 	const char *path0[2];
 	const char *path1[2];
@@ -211,14 +214,10 @@ struct diff_filespec *alloc_filespec(const char *path)
 {
 	int namelen = strlen(path);
 	struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
+
+	memset(spec, 0, sizeof(*spec));
 	spec->path = (char *)(spec + 1);
-	strcpy(spec->path, path);
-	spec->should_free = spec->should_munmap = 0;
-	spec->xfrm_flags = 0;
-	spec->size = 0;
-	spec->data = NULL;
-	spec->mode = 0;
-	memset(spec->sha1, 0, 20);
+	memcpy(spec->path, path, namelen+1);
 	return spec;
 }
 
@@ -377,8 +376,10 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
 		if (fd < 0)
 			goto err_empty;
 		s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
-		s->should_munmap = 1;
 		close(fd);
+		if (s->data == MAP_FAILED)
+			goto err_empty;
+		s->should_munmap = 1;
 	}
 	else {
 		char type[20];
@@ -419,8 +420,7 @@ static void prep_temp_blob(struct diff_tempfile *temp,
 {
 	int fd;
 
-	strcpy(temp->tmp_path, ".diff_XXXXXX");
-	fd = mkstemp(temp->tmp_path);
+	fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
 	if (fd < 0)
 		die("unable to create temp-file");
 	if (write(fd, blob, size) != size)
@@ -528,10 +528,12 @@ static void run_external_diff(const char *pgm,
 	pid_t pid;
 	int status;
 	static int atexit_asked = 0;
+	const char *othername;
 
+	othername = (other? other : name);
 	if (one && two) {
 		prepare_temp_file(name, &temp[0], one);
-		prepare_temp_file(other ? : name, &temp[1], two);
+		prepare_temp_file(othername, &temp[1], two);
 		if (! atexit_asked &&
 		    (temp[0].name == temp[0].tmp_path ||
 		     temp[1].name == temp[1].tmp_path)) {
@@ -572,7 +574,7 @@ static void run_external_diff(const char *pgm,
 		 * otherwise we use the built-in one.
 		 */
 		if (one && two)
-			builtin_diff(name, other ? : name, temp, xfrm_msg,
+			builtin_diff(name, othername, temp, xfrm_msg,
 				     complete_rewrite);
 		else
 			printf("* Unmerged path %s\n", name);
@@ -699,7 +701,7 @@ static int parse_num(const char **cp_p)
 			scale *= 10;
 			num = num * 10 + ch - '0';
 		}
-		*cp++;
+		cp++;
 	}
 	*cp_p = cp;
 
@@ -760,7 +762,8 @@ struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
 	dp->status = 0;
 	dp->source_stays = 0;
 	dp->broken_pair = 0;
-	diff_q(queue, dp);
+	if (queue)
+		diff_q(queue, dp);
 	return dp;
 }
 
@@ -768,6 +771,8 @@ void diff_free_filepair(struct diff_filepair *p)
 {
 	diff_free_filespec_data(p->one);
 	diff_free_filespec_data(p->two);
+	free(p->one);
+	free(p->two);
 	free(p);
 }
 
@@ -779,7 +784,8 @@ static void diff_flush_raw(struct diff_filepair *p,
 	char status[10];
 
 	if (line_termination) {
-		const char *err = "path %s cannot be expressed without -z";
+		const char *const err =
+			"path %s cannot be expressed without -z";
 		if (strchr(p->one->path, line_termination) ||
 		    strchr(p->one->path, inter_name_termination))
 			die(err, p->one->path);
@@ -886,13 +892,13 @@ int diff_queue_is_empty(void)
 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
 {
 	fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
-		x, one ? : "",
+		x, one ? one : "",
 		s->path,
 		DIFF_FILE_VALID(s) ? "valid" : "invalid",
 		s->mode,
 		s->sha1_valid ? sha1_to_hex(s->sha1) : "");
 	fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
-		x, one ? : "",
+		x, one ? one : "",
 		s->size, s->xfrm_flags);
 }
 
@@ -901,7 +907,7 @@ void diff_debug_filepair(const struct diff_filepair *p, int i)
 	diff_debug_filespec(p->one, i, "one");
 	diff_debug_filespec(p->two, i, "two");
 	fprintf(stderr, "score %d, status %c stays %d broken %d\n",
-		p->score, p->status ? : '?',
+		p->score, p->status ? p->status : '?',
 		p->source_stays, p->broken_pair);
 }
 
@@ -949,7 +955,9 @@ static void diff_resolve_rename_copy(void)
 			}
 			/* See if there is some other filepair that
 			 * copies from the same source as us.  If so
-			 * we are a copy.  Otherwise we are a rename.
+			 * we are a copy.  Otherwise we are either a
+			 * copy if the path stays, or a rename if it
+			 * does not, but we already handled "stays" case.
 			 */
 			for (j = i + 1; j < q->nr; j++) {
 				pp = q->queue[j];
@@ -1007,9 +1015,8 @@ void diff_flush(int diff_output_style, int line_termination)
 			diff_flush_name(p, line_termination);
 			break;
 		}
-	}
-	for (i = 0; i < q->nr; i++)
 		diff_free_filepair(q->queue[i]);
+	}
 	free(q->queue);
 	q->queue = NULL;
 	q->nr = q->alloc = 0;
@@ -1145,29 +1152,6 @@ void diff_addremove(int addremove, unsigned mode,
 	diff_queue(&diff_queued_diff, one, two);
 }
 
-void diff_helper_input(unsigned old_mode,
-		       unsigned new_mode,
-		       const unsigned char *old_sha1,
-		       const unsigned char *new_sha1,
-		       const char *old_path,
-		       int status,
-		       int score,
-		       const char *new_path)
-{
-	struct diff_filespec *one, *two;
-	struct diff_filepair *dp;
-
-	one = alloc_filespec(old_path);
-	two = alloc_filespec(new_path);
-	if (old_mode)
-		fill_filespec(one, old_sha1, old_mode);
-	if (new_mode)
-		fill_filespec(two, new_sha1, new_mode);
-	dp = diff_queue(&diff_queued_diff, one, two);
-	dp->score = score * MAX_SCORE / 100;
-	dp->status = status;
-}
-
 void diff_change(unsigned old_mode, unsigned new_mode,
 		 const unsigned char *old_sha1,
 		 const unsigned char *new_sha1,