[PATCH 2/4] revert: use getn_sha1() to simplify insn parsing

[Ramkumar Ramachandra <artagnon@gmail.com>]

To read the object name in the instruction sheet, we currently
manipulate the buffer to artificially introduce a NUL after the
supposed object name, and then use get_sha1() to read the object name
before restoring the buffer.  Get rid of this ugliness by using
getn_sha1(), a function introduced in the previous patch.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 sequencer.c |   12 +++---------
 1 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index a37846a..458cffb 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -517,8 +517,7 @@ static struct commit *parse_insn_line(char *bol, char *eol, struct replay_opts *
 {
 	unsigned char commit_sha1[20];
 	enum replay_action action;
-	char *end_of_object_name;
-	int saved, status, padding;
+	int namelen, padding;
 
 	if (!prefixcmp(bol, "pick")) {
 		action = REPLAY_PICK;
@@ -535,12 +534,6 @@ static struct commit *parse_insn_line(char *bol, char *eol, struct replay_opts *
 		return NULL;
 	bol += padding;
 
-	end_of_object_name = bol + strcspn(bol, " \t\n");
-	saved = *end_of_object_name;
-	*end_of_object_name = '\0';
-	status = get_sha1(bol, commit_sha1);
-	*end_of_object_name = saved;
-
 	/*
 	 * Verify that the action matches up with the one in
 	 * opts; we don't support arbitrary instructions
@@ -552,8 +545,8 @@ static struct commit *parse_insn_line(char *bol, char *eol, struct replay_opts *
 		return NULL;
 	}
 
-	if (status < 0)
+	namelen = strcspn(bol, " \t\n");
+	if (getn_sha1(bol, namelen, commit_sha1))
 		return NULL;
 
 	return lookup_commit_reference(commit_sha1);
-- 
1.7.8.1.362.g5d6df.dirty