diff --git a/diff.c b/diff.c
index cbb86320a6b..823c8d0aabe 100644
--- a/diff.c
+++ b/diff.c
@@ -13,6 +13,46 @@ static const char *diff_opts = "-pu";
static int use_size_cache;
+static char *quote_one(const char *str)
+{
+ int needlen;
+ char *xp;
+
+ if (!str)
+ return NULL;
+ needlen = quote_c_style(str, NULL, NULL, 0);
+ if (!needlen)
+ return strdup(str);
+ xp = xmalloc(needlen + 1);
+ quote_c_style(str, xp, NULL, 0);
+ return xp;
+}
+
+static char *quote_two(const char *one, const char *two)
+{
+ int need_one = quote_c_style(one, NULL, NULL, 1);
+ int need_two = quote_c_style(two, NULL, NULL, 1);
+ char *xp;
+
+ if (need_one + need_two) {
+ if (!need_one) need_one = strlen(one);
+ if (!need_two) need_one = strlen(two);
+
+ xp = xmalloc(need_one + need_two + 3);
+ xp[0] = '"';
+ quote_c_style(one, xp + 1, NULL, 1);
+ quote_c_style(two, xp + need_one + 1, NULL, 1);
+ strcpy(xp + need_one + need_two + 1, "\"");
+ return xp;
+ }
+ need_one = strlen(one);
+ need_two = strlen(two);
+ xp = xmalloc(need_one + need_two + 1);
+ strcpy(xp, one);
+ strcpy(xp + need_one, two);
+ return xp;
+}
+
static const char *external_diff(void)
{
static const char *external_diff_cmd = NULL;
@@ -133,55 +173,52 @@ static void builtin_diff(const char *name_a,
int complete_rewrite)
{
int i, next_at, cmd_size;
- const char *const diff_cmd = "diff -L%s%s -L%s%s";
+ const char *const diff_cmd = "diff -L%s -L%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];
- const char *name_sq[2];
+ const char *label_path[2];
char *cmd;
- name_sq[0] = sq_quote(name_a);
- name_sq[1] = sq_quote(name_b);
-
- /* diff_cmd and diff_arg have 6 %s in total which makes
- * the sum of these strings 12 bytes larger than required.
+ /* diff_cmd and diff_arg have 4 %s in total which makes
+ * the sum of these strings 8 bytes larger than required.
* we use 2 spaces around diff-opts, and we need to count
- * terminating NUL, so we subtract 9 here.
+ * terminating NUL; we used to subtract 5 here, but we do not
+ * care about small leaks in this subprocess that is about
+ * to exec "diff" anymore.
*/
- cmd_size = (strlen(diff_cmd) + strlen(diff_opts) +
- strlen(diff_arg) - 9);
+ cmd_size = (strlen(diff_cmd) + strlen(diff_opts) + strlen(diff_arg)
+ + 128);
+
for (i = 0; i < 2; i++) {
input_name_sq[i] = sq_quote(temp[i].name);
- if (!strcmp(temp[i].name, "/dev/null")) {
- path0[i] = "/dev/null";
- path1[i] = "";
- } else {
- path0[i] = i ? "b/" : "a/";
- path1[i] = name_sq[i];
- }
- cmd_size += (strlen(path0[i]) + strlen(path1[i]) +
- strlen(input_name_sq[i]));
+ if (!strcmp(temp[i].name, "/dev/null"))
+ label_path[i] = "/dev/null";
+ else if (!i)
+ label_path[i] = sq_quote(quote_two("a/", name_a));
+ else
+ label_path[i] = sq_quote(quote_two("b/", name_b));
+ cmd_size += (strlen(label_path[i]) + strlen(input_name_sq[i]));
}
cmd = xmalloc(cmd_size);
next_at = 0;
next_at += snprintf(cmd+next_at, cmd_size-next_at,
- diff_cmd,
- path0[0], path1[0], path0[1], path1[1]);
+ diff_cmd, label_path[0], label_path[1]);
next_at += snprintf(cmd+next_at, cmd_size-next_at,
" %s ", diff_opts);
next_at += snprintf(cmd+next_at, cmd_size-next_at,
diff_arg, input_name_sq[0], input_name_sq[1]);
- printf("diff --git a/%s b/%s\n", name_a, name_b);
- if (!path1[0][0]) {
+ printf("diff --git %s %s\n",
+ quote_two("a/", name_a), quote_two("b/", name_b));
+ if (label_path[0][0] == '/') {
+ /* dev/null */
printf("new file mode %s\n", temp[1].mode);
if (xfrm_msg && xfrm_msg[0])
puts(xfrm_msg);
}
- else if (!path1[1][0]) {
+ else if (label_path[1][0] == '/') {
printf("deleted file mode %s\n", temp[0].mode);
if (xfrm_msg && xfrm_msg[0])
puts(xfrm_msg);
@@ -619,6 +656,7 @@ static void run_diff(struct diff_filepair *p)
struct diff_filespec *two;
const char *name;
const char *other;
+ char *name_munged, *other_munged;
int complete_rewrite = 0;
int len;
@@ -631,6 +669,8 @@ static void run_diff(struct diff_filepair *p)
name = p->one->path;
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
+ name_munged = quote_one(name);
+ other_munged = quote_one(other);
one = p->one; two = p->two;
diff_fill_sha1_info(one);
@@ -644,7 +684,7 @@ static void run_diff(struct diff_filepair *p)
"copy from %s\n"
"copy to %s\n",
(int)(0.5 + p->score * 100.0/MAX_SCORE),
- name, other);
+ name_munged, other_munged);
break;
case DIFF_STATUS_RENAMED:
len += snprintf(msg + len, sizeof(msg) - len,
@@ -652,7 +692,7 @@ static void run_diff(struct diff_filepair *p)
"rename from %s\n"
"rename to %s\n",
(int)(0.5 + p->score * 100.0/MAX_SCORE),
- name, other);
+ name_munged, other_munged);
break;
case DIFF_STATUS_MODIFIED:
if (p->score) {
@@ -702,6 +742,9 @@ static void run_diff(struct diff_filepair *p)
else
run_external_diff(pgm, name, other, one, two, xfrm_msg,
complete_rewrite);
+
+ free(name_munged);
+ free(other_munged);
}
void diff_setup(struct diff_options *options)
@@ -878,16 +921,13 @@ static void diff_flush_raw(struct diff_filepair *p,
{
int two_paths;
char status[10];
+ const char *path_one, *path_two;
+ path_one = p->one->path;
+ path_two = p->two->path;
if (line_termination) {
- 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);
- if (strchr(p->two->path, line_termination) ||
- strchr(p->two->path, inter_name_termination))
- die(err, p->two->path);
+ path_one = quote_one(path_one);
+ path_two = quote_one(path_two);
}
if (p->score)
@@ -915,16 +955,29 @@ static void diff_flush_raw(struct diff_filepair *p,
p->one->mode, p->two->mode, sha1_to_hex(p->one->sha1));
printf("%s ", sha1_to_hex(p->two->sha1));
}
- printf("%s%c%s",status, inter_name_termination, p->one->path);
+ printf("%s%c%s", status, inter_name_termination, path_one);
if (two_paths)
- printf("%c%s", inter_name_termination, p->two->path);
+ printf("%c%s", inter_name_termination, path_two);
putchar(line_termination);
+ if (path_one != p->one->path)
+ free((void*)path_one);
+ if (path_two != p->two->path)
+ free((void*)path_two);
}
static void diff_flush_name(struct diff_filepair *p,
+ int inter_name_termination,
int line_termination)
{
- printf("%s%c", p->two->path, line_termination);
+ char *path = p->two->path;
+
+ if (line_termination)
+ path = quote_one(p->two->path);
+ else
+ path = p->two->path;
+ printf("%s%c", path, line_termination);
+ if (p->two->path != path)
+ free(path);
}
int diff_unmodified_pair(struct diff_filepair *p)
@@ -1111,7 +1164,9 @@ void diff_flush(struct diff_options *options)
diff_output_format);
break;
case DIFF_FORMAT_NAME:
- diff_flush_name(p, line_termination);
+ diff_flush_name(p,
+ inter_name_termination,
+ line_termination);
break;
}
diff_free_filepair(q->queue[i]);