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authorMichael Haggerty <mhagger@alum.mit.edu>2014-04-07 13:48:05 (GMT)
committerJunio C Hamano <gitster@pobox.com>2014-04-07 19:09:13 (GMT)
commit3afcc4637452100c68b469de7757dd2b45b4d29c (patch)
treea807097b5fffd560f9dd598745e7264d29a60fd1 /builtin/update-ref.c
parent191f241b528c10e242d045bde2cef70fb013a6e5 (diff)
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update-ref.c: extract a new function, parse_next_sha1()
Replace three functions, update_store_new_sha1(), update_store_old_sha1(), and parse_next_arg(), with a single function, parse_next_sha1(). The new function takes care of a whole argument, including checking whether it is there, converting it to an SHA-1, and emitting errors on EOF or for invalid values. The return value indicates whether the argument was present or absent, which requires a bit of intelligence because absent values are represented differently depending on whether "-z" was used. The new interface means that the calling functions, parse_cmd_*(), don't have to interpret the result differently based on the line_termination mode that is in effect. It also means that parse_cmd_create() can distinguish unambiguously between an empty new value and a zeros new value, which fixes a failure in t1400. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin/update-ref.c')
-rw-r--r--builtin/update-ref.c160
1 files changed, 98 insertions, 62 deletions
diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index a9eb5fe..c61120f 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -35,27 +35,6 @@ static struct ref_update *update_alloc(void)
return update;
}
-static void update_store_new_sha1(const char *command,
- struct ref_update *update,
- const char *newvalue)
-{
- if (*newvalue && get_sha1(newvalue, update->new_sha1))
- die("%s %s: invalid <newvalue>: %s",
- command, update->ref_name, newvalue);
-}
-
-static void update_store_old_sha1(const char *command,
- struct ref_update *update,
- const char *oldvalue)
-{
- if (*oldvalue && get_sha1(oldvalue, update->old_sha1))
- die("%s %s: invalid <oldvalue>: %s",
- command, update->ref_name, oldvalue);
-
- /* We have an old value if non-empty, or if empty without -z */
- update->have_old = *oldvalue || line_termination;
-}
-
/*
* Parse one whitespace- or NUL-terminated, possibly C-quoted argument
* and append the result to arg. Return a pointer to the terminator.
@@ -112,35 +91,94 @@ static char *parse_refname(struct strbuf *input, const char **next)
}
/*
- * Parse a SP/NUL separator followed by the next SP- or NUL-terminated
- * argument, if any. If there is an argument, write it to arg, set
- * *next to point at the character terminating the argument, and
+ * The value being parsed is <oldvalue> (as opposed to <newvalue>; the
+ * difference affects which error messages are generated):
+ */
+#define PARSE_SHA1_OLD 0x01
+
+/*
+ * For backwards compatibility, accept an empty string for update's
+ * <newvalue> in binary mode to be equivalent to specifying zeros.
+ */
+#define PARSE_SHA1_ALLOW_EMPTY 0x02
+
+/*
+ * Parse an argument separator followed by the next argument, if any.
+ * If there is an argument, convert it to a SHA-1, write it to sha1,
+ * set *next to point at the character terminating the argument, and
* return 0. If there is no argument at all (not even the empty
- * string), return a non-zero result and leave *next unchanged.
+ * string), return 1 and leave *next unchanged. If the value is
+ * provided but cannot be converted to a SHA-1, die. flags can
+ * include PARSE_SHA1_OLD and/or PARSE_SHA1_ALLOW_EMPTY.
*/
-static int parse_next_arg(struct strbuf *input, const char **next,
- struct strbuf *arg)
+static int parse_next_sha1(struct strbuf *input, const char **next,
+ unsigned char *sha1,
+ const char *command, const char *refname,
+ int flags)
{
- strbuf_reset(arg);
+ struct strbuf arg = STRBUF_INIT;
+ int ret = 0;
+
+ if (*next == input->buf + input->len)
+ goto eof;
+
if (line_termination) {
/* Without -z, consume SP and use next argument */
if (!**next || **next == line_termination)
- return -1;
+ return 1;
if (**next != ' ')
- die("expected SP but got: %s", *next);
+ die("%s %s: expected SP but got: %s",
+ command, refname, *next);
(*next)++;
- *next = parse_arg(*next, arg);
+ *next = parse_arg(*next, &arg);
+ if (arg.len) {
+ if (get_sha1(arg.buf, sha1))
+ goto invalid;
+ } else {
+ /* Without -z, an empty value means all zeros: */
+ hashclr(sha1);
+ }
} else {
/* With -z, read the next NUL-terminated line */
if (**next)
- die("expected NUL but got: %s", *next);
+ die("%s %s: expected NUL but got: %s",
+ command, refname, *next);
(*next)++;
if (*next == input->buf + input->len)
- return -1;
- strbuf_addstr(arg, *next);
- *next += arg->len;
+ goto eof;
+ strbuf_addstr(&arg, *next);
+ *next += arg.len;
+
+ if (arg.len) {
+ if (get_sha1(arg.buf, sha1))
+ goto invalid;
+ } else if (flags & PARSE_SHA1_ALLOW_EMPTY) {
+ /* With -z, treat an empty value as all zeros: */
+ hashclr(sha1);
+ } else {
+ /*
+ * With -z, an empty non-required value means
+ * unspecified:
+ */
+ ret = 1;
+ }
}
- return 0;
+
+ strbuf_release(&arg);
+
+ return ret;
+
+ invalid:
+ die(flags & PARSE_SHA1_OLD ?
+ "%s %s: invalid <oldvalue>: %s" :
+ "%s %s: invalid <newvalue>: %s",
+ command, refname, arg.buf);
+
+ eof:
+ die(flags & PARSE_SHA1_OLD ?
+ "%s %s missing <oldvalue>" :
+ "%s %s missing <newvalue>",
+ command, refname);
}
@@ -156,8 +194,6 @@ static int parse_next_arg(struct strbuf *input, const char **next,
static const char *parse_cmd_update(struct strbuf *input, const char *next)
{
- struct strbuf newvalue = STRBUF_INIT;
- struct strbuf oldvalue = STRBUF_INIT;
struct ref_update *update;
update = update_alloc();
@@ -166,24 +202,23 @@ static const char *parse_cmd_update(struct strbuf *input, const char *next)
if (!update->ref_name)
die("update line missing <ref>");
- if (!parse_next_arg(input, &next, &newvalue))
- update_store_new_sha1("update", update, newvalue.buf);
- else
+ if (parse_next_sha1(input, &next, update->new_sha1,
+ "update", update->ref_name,
+ PARSE_SHA1_ALLOW_EMPTY))
die("update %s missing <newvalue>", update->ref_name);
- if (!parse_next_arg(input, &next, &oldvalue)) {
- update_store_old_sha1("update", update, oldvalue.buf);
- if (*next != line_termination)
- die("update %s has extra input: %s", update->ref_name, next);
- } else if (!line_termination)
- die("update %s missing <oldvalue>", update->ref_name);
+ update->have_old = !parse_next_sha1(input, &next, update->old_sha1,
+ "update", update->ref_name,
+ PARSE_SHA1_OLD);
+
+ if (*next != line_termination)
+ die("update %s has extra input: %s", update->ref_name, next);
return next;
}
static const char *parse_cmd_create(struct strbuf *input, const char *next)
{
- struct strbuf newvalue = STRBUF_INIT;
struct ref_update *update;
update = update_alloc();
@@ -192,9 +227,8 @@ static const char *parse_cmd_create(struct strbuf *input, const char *next)
if (!update->ref_name)
die("create line missing <ref>");
- if (!parse_next_arg(input, &next, &newvalue))
- update_store_new_sha1("create", update, newvalue.buf);
- else
+ if (parse_next_sha1(input, &next, update->new_sha1,
+ "create", update->ref_name, 0))
die("create %s missing <newvalue>", update->ref_name);
if (is_null_sha1(update->new_sha1))
@@ -208,7 +242,6 @@ static const char *parse_cmd_create(struct strbuf *input, const char *next)
static const char *parse_cmd_delete(struct strbuf *input, const char *next)
{
- struct strbuf oldvalue = STRBUF_INIT;
struct ref_update *update;
update = update_alloc();
@@ -217,12 +250,14 @@ static const char *parse_cmd_delete(struct strbuf *input, const char *next)
if (!update->ref_name)
die("delete line missing <ref>");
- if (!parse_next_arg(input, &next, &oldvalue)) {
- update_store_old_sha1("delete", update, oldvalue.buf);
- if (update->have_old && is_null_sha1(update->old_sha1))
+ if (parse_next_sha1(input, &next, update->old_sha1,
+ "delete", update->ref_name, PARSE_SHA1_OLD)) {
+ update->have_old = 0;
+ } else {
+ if (is_null_sha1(update->old_sha1))
die("delete %s given zero <oldvalue>", update->ref_name);
- } else if (!line_termination)
- die("delete %s missing <oldvalue>", update->ref_name);
+ update->have_old = 1;
+ }
if (*next != line_termination)
die("delete %s has extra input: %s", update->ref_name, next);
@@ -232,7 +267,6 @@ static const char *parse_cmd_delete(struct strbuf *input, const char *next)
static const char *parse_cmd_verify(struct strbuf *input, const char *next)
{
- struct strbuf value = STRBUF_INIT;
struct ref_update *update;
update = update_alloc();
@@ -241,11 +275,13 @@ static const char *parse_cmd_verify(struct strbuf *input, const char *next)
if (!update->ref_name)
die("verify line missing <ref>");
- if (!parse_next_arg(input, &next, &value)) {
- update_store_old_sha1("verify", update, value.buf);
+ if (parse_next_sha1(input, &next, update->old_sha1,
+ "verify", update->ref_name, PARSE_SHA1_OLD)) {
+ update->have_old = 0;
+ } else {
hashcpy(update->new_sha1, update->old_sha1);
- } else if (!line_termination)
- die("verify %s missing <oldvalue>", update->ref_name);
+ update->have_old = 1;
+ }
if (*next != line_termination)
die("verify %s has extra input: %s", update->ref_name, next);