[PATCH] builtin-apply.c: Skip filenames without enough components

find_name() wrongly returned the whole filename for filenames without
enough leading pathname components (e.g., when applying a patch to a
top-level file with -p2).

Include the -p value used in the error message when no filenames can be
found.

Signed-off-by: Andreas Gruenbacher <redacted>
---
 builtin-apply.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/builtin-apply.c b/builtin-apply.c
index 541493e..b99db0b 100644
--- a/builtin-apply.c
+++ b/builtin-apply.c

@@ -404,6 +404,9 @@ static char *squash_slash(char *name)
 {
 	int i = 0, j = 0;
 
+	if (!name)
+		return NULL;
+
 	while (name[i]) {
 		if ((name[j++] = name[i++]) == '/')
 			while (name[i] == '/')

@@ -416,7 +419,10 @@ static char *squash_slash(char *name)
 static char *find_name(const char *line, char *def, int p_value, int terminate)
 {
 	int len;
-	const char *start = line;
+	const char *start = NULL;
+
+	if (p_value == 0)
+		start = line;
 
 	if (*line == '"') {
 		struct strbuf name = STRBUF_INIT;

@@ -1199,7 +1205,8 @@ static int find_header(char *line, unsigned long size, int *hdrsize, 

struct patc
 				continue;
 			if (!patch->old_name && !patch->new_name) {
 				if (!patch->def_name)
-					die("git diff header lacks filename information (line %d)", linenr);
+					die("git diff header lacks filename information when removing "
+					    "%d leading pathname components (line %d)" , p_value, linenr);
 				patch->old_name = patch->new_name = patch->def_name;
 			}
 			patch->is_toplevel_relative = 1;
-- 
1.6.6.197.g9c4a28