[PATCH] update-ref --stdin: use skip_prefix()

[SZEDER Gábor]

Use skip_prefix() instead of starts_with() and strcmp() when parsing
'git update-ref's stdin to avoid a couple of magic numbers.

Signed-off-by: SZEDER Gábor <szeder....@gmail.com>
---
 builtin/update-ref.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 4b4714b3fd..4fa3c0a86f 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -311,11 +311,12 @@ static const char *parse_cmd_verify(struct 
ref_transaction *transaction,
 
 static const char *parse_cmd_option(struct strbuf *input, const char *next)
 {
-       if (!strncmp(next, "no-deref", 8) && next[8] == line_termination)
+       const char *rest;
+       if (skip_prefix(next, "no-deref", &rest) && *rest == line_termination)
                update_flags |= REF_NO_DEREF;
        else
                die("option unknown: %s", next);
-       return next + 8;
+       return rest;
 }
 
 static void update_refs_stdin(struct ref_transaction *transaction)
@@ -332,16 +333,16 @@ static void update_refs_stdin(struct ref_transaction 
*transaction)
                        die("empty command in input");
                else if (isspace(*next))
                        die("whitespace before command: %s", next);
-               else if (starts_with(next, "update "))
-                       next = parse_cmd_update(transaction, &input, next + 7);
-               else if (starts_with(next, "create "))
-                       next = parse_cmd_create(transaction, &input, next + 7);
-               else if (starts_with(next, "delete "))
-                       next = parse_cmd_delete(transaction, &input, next + 7);
-               else if (starts_with(next, "verify "))
-                       next = parse_cmd_verify(transaction, &input, next + 7);
-               else if (starts_with(next, "option "))
-                       next = parse_cmd_option(&input, next + 7);
+               else if (skip_prefix(next, "update ", &next))
+                       next = parse_cmd_update(transaction, &input, next);
+               else if (skip_prefix(next, "create ", &next))
+                       next = parse_cmd_create(transaction, &input, next);
+               else if (skip_prefix(next, "delete ", &next))
+                       next = parse_cmd_delete(transaction, &input, next);
+               else if (skip_prefix(next, "verify ", &next))
+                       next = parse_cmd_verify(transaction, &input, next);
+               else if (skip_prefix(next, "option ", &next))
+                       next = parse_cmd_option(&input, next);
                else
                        die("unknown command: %s", next);
 
-- 
2.18.0.rc0.207.ga6211da864