qobject: Make QString immutable
The functions to modify a QString's string are all unused now. Drop
them, and make the string immutable. Saves 16 bytes per QString on my
system.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201211171152.146877-21-armbru@redhat.com>
diff --git a/include/qapi/qmp/qstring.h b/include/qapi/qmp/qstring.h
index 53567db..1d8ba46 100644
--- a/include/qapi/qmp/qstring.h
+++ b/include/qapi/qmp/qstring.h
@@ -17,19 +17,13 @@
struct QString {
struct QObjectBase_ base;
- char *string;
- size_t length;
- size_t capacity;
+ const char *string;
};
QString *qstring_new(void);
QString *qstring_from_str(const char *str);
QString *qstring_from_substr(const char *str, size_t start, size_t end);
QString *qstring_from_gstring(GString *gstr);
-size_t qstring_get_length(const QString *qstring);
const char *qstring_get_str(const QString *qstring);
-void qstring_append_int(QString *qstring, int64_t value);
-void qstring_append(QString *qstring, const char *str);
-void qstring_append_chr(QString *qstring, int c);
#endif /* QSTRING_H */
diff --git a/qobject/qstring.c b/qobject/qstring.c
index ea86d80..b461389 100644
--- a/qobject/qstring.c
+++ b/qobject/qstring.c
@@ -25,14 +25,6 @@
}
/**
- * qstring_get_length(): Get the length of a QString
- */
-size_t qstring_get_length(const QString *qstring)
-{
- return qstring->length;
-}
-
-/**
* qstring_from_substr(): Create a new QString from a C string substring
*
* Return string reference
@@ -42,18 +34,9 @@
QString *qstring;
assert(start <= end);
-
qstring = g_malloc(sizeof(*qstring));
qobject_init(QOBJECT(qstring), QTYPE_QSTRING);
-
- qstring->length = end - start;
- qstring->capacity = qstring->length;
-
- assert(qstring->capacity < SIZE_MAX);
- qstring->string = g_malloc(qstring->capacity + 1);
- memcpy(qstring->string, str + start, qstring->length);
- qstring->string[qstring->length] = 0;
-
+ qstring->string = g_strndup(str + start, end - start);
return qstring;
}
@@ -79,55 +62,11 @@
qstring = g_malloc(sizeof(*qstring));
qobject_init(QOBJECT(qstring), QTYPE_QSTRING);
- qstring->length = gstr->len;
- qstring->capacity = gstr->allocated_len;
qstring->string = g_string_free(gstr, false);
return qstring;
}
-static void capacity_increase(QString *qstring, size_t len)
-{
- if (qstring->capacity < (qstring->length + len)) {
- assert(len <= SIZE_MAX - qstring->capacity);
- qstring->capacity += len;
- assert(qstring->capacity <= SIZE_MAX / 2);
- qstring->capacity *= 2; /* use exponential growth */
-
- qstring->string = g_realloc(qstring->string, qstring->capacity + 1);
- }
-}
-
-/* qstring_append(): Append a C string to a QString
- */
-void qstring_append(QString *qstring, const char *str)
-{
- size_t len = strlen(str);
-
- capacity_increase(qstring, len);
- memcpy(qstring->string + qstring->length, str, len);
- qstring->length += len;
- qstring->string[qstring->length] = 0;
-}
-
-void qstring_append_int(QString *qstring, int64_t value)
-{
- char num[32];
-
- snprintf(num, sizeof(num), "%" PRId64, value);
- qstring_append(qstring, num);
-}
-
-/**
- * qstring_append_chr(): Append a C char to a QString
- */
-void qstring_append_chr(QString *qstring, int c)
-{
- capacity_increase(qstring, 1);
- qstring->string[qstring->length++] = c;
- qstring->string[qstring->length] = 0;
-}
-
/**
* qstring_get_str(): Return a pointer to the stored string
*
@@ -158,6 +97,6 @@
assert(obj != NULL);
qs = qobject_to(QString, obj);
- g_free(qs->string);
+ g_free((char *)qs->string);
g_free(qs);
}
diff --git a/tests/check-qobject.c b/tests/check-qobject.c
index 6b6deae..c1713d1 100644
--- a/tests/check-qobject.c
+++ b/tests/check-qobject.c
@@ -155,8 +155,7 @@
str_case = qstring_from_str("Foo");
/* Should yield "foo" */
- str_built = qstring_from_substr("form", 0, 2);
- qstring_append_chr(str_built, 'o');
+ str_built = qstring_from_substr("buffoon", 3, 6);
check_unequal(str_base, str_whitespace_0, str_whitespace_1,
str_whitespace_2, str_whitespace_3, str_case);
diff --git a/tests/check-qstring.c b/tests/check-qstring.c
index 2d07992..4bf9772 100644
--- a/tests/check-qstring.c
+++ b/tests/check-qstring.c
@@ -47,21 +47,6 @@
qobject_unref(qstring);
}
-static void qstring_append_chr_test(void)
-{
- int i;
- QString *qstring;
- const char *str = "qstring append char unit-test";
-
- qstring = qstring_new();
-
- for (i = 0; str[i]; i++)
- qstring_append_chr(qstring, str[i]);
-
- g_assert(strcmp(str, qstring_get_str(qstring)) == 0);
- qobject_unref(qstring);
-}
-
static void qstring_from_substr_test(void)
{
QString *qs;
@@ -90,7 +75,6 @@
g_test_add_func("/public/from_str", qstring_from_str_test);
g_test_add_func("/public/get_str", qstring_get_str_test);
- g_test_add_func("/public/append_chr", qstring_append_chr_test);
g_test_add_func("/public/from_substr", qstring_from_substr_test);
g_test_add_func("/public/to_qstring", qobject_to_qstring_test);
