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[binutils-gdb] Introduce string_vprintf
- From: Tom Tromey <tromey at sourceware dot org>
- To: gdb-cvs at sourceware dot org
- Date: 30 Sep 2017 02:58:43 -0000
- Subject: [binutils-gdb] Introduce string_vprintf
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=bd413795d364d3bed8dbb8c596cb45c82ed31041
commit bd413795d364d3bed8dbb8c596cb45c82ed31041
Author: Tom Tromey <tom@tromey.com>
Date: Thu Sep 28 07:44:50 2017 -0600
Introduce string_vprintf
This adds string_vprintf, a va_list variant of string_printf. This
will be used in later patches.
gdb/ChangeLog
2017-09-29 Tom Tromey <tom@tromey.com>
* unittests/common-utils-selftests.c (format): New function.
(string_vprintf_tests): New function.
(_initialize_common_utils_selftests): Register new tests.
* common/common-utils.c (string_vprintf): New function.
* common/common-utils.h (string_vprintf): Declare.
Diff:
---
gdb/ChangeLog | 8 ++++++++
gdb/common/common-utils.c | 21 +++++++++++++++++++++
gdb/common/common-utils.h | 4 ++++
gdb/unittests/common-utils-selftests.c | 23 +++++++++++++++++++++++
4 files changed, 56 insertions(+)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index aaa0f14..b112b02 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,11 @@
+2017-09-29 Tom Tromey <tom@tromey.com>
+
+ * unittests/common-utils-selftests.c (format): New function.
+ (string_vprintf_tests): New function.
+ (_initialize_common_utils_selftests): Register new tests.
+ * common/common-utils.c (string_vprintf): New function.
+ * common/common-utils.h (string_vprintf): Declare.
+
2017-09-29 Pedro Alves <palves@redhat.com>
* common/rsp-low.c (unpack_varlen_hex): Constify.
diff --git a/gdb/common/common-utils.c b/gdb/common/common-utils.c
index 6b10d11..d8c546a 100644
--- a/gdb/common/common-utils.c
+++ b/gdb/common/common-utils.c
@@ -174,6 +174,27 @@ string_printf (const char* fmt, ...)
return str;
}
+/* See documentation in common-utils.h. */
+
+std::string
+string_vprintf (const char* fmt, va_list args)
+{
+ va_list vp;
+ size_t size;
+
+ va_copy (vp, args);
+ size = vsnprintf (NULL, 0, fmt, vp);
+ va_end (vp);
+
+ std::string str (size, '\0');
+
+ /* C++11 and later guarantee std::string uses contiguous memory and
+ always includes the terminating '\0'. */
+ vsprintf (&str[0], fmt, args);
+
+ return str;
+}
+
char *
savestring (const char *ptr, size_t len)
{
diff --git a/gdb/common/common-utils.h b/gdb/common/common-utils.h
index 6475c28..19724f9 100644
--- a/gdb/common/common-utils.h
+++ b/gdb/common/common-utils.h
@@ -63,6 +63,10 @@ int xsnprintf (char *str, size_t size, const char *format, ...)
std::string string_printf (const char* fmt, ...)
ATTRIBUTE_PRINTF (1, 2);
+/* Like string_printf, but takes a va_list. */
+std::string string_vprintf (const char* fmt, va_list args)
+ ATTRIBUTE_PRINTF (1, 0);
+
/* Make a copy of the string at PTR with LEN characters
(and add a null character at the end in the copy).
Uses malloc to get the space. Returns the address of the copy. */
diff --git a/gdb/unittests/common-utils-selftests.c b/gdb/unittests/common-utils-selftests.c
index 71bc2df..0f26b21 100644
--- a/gdb/unittests/common-utils-selftests.c
+++ b/gdb/unittests/common-utils-selftests.c
@@ -41,10 +41,33 @@ string_printf_tests ()
SELF_CHECK (string_printf ("%s", X100000) == X100000);
}
+static std::string
+format (const char *fmt, ...)
+{
+ va_list vp;
+
+ va_start (vp, fmt);
+ std::string result = string_vprintf (fmt, vp);
+ va_end (vp);
+ return result;
+}
+
+static void
+string_vprintf_tests ()
+{
+ /* Basic smoke tests. */
+ SELF_CHECK (format ("%s", "test") == "test");
+ SELF_CHECK (format ("%d", 23) == "23");
+ SELF_CHECK (format ("%s %d %s", "test", 23, "done")
+ == "test 23 done");
+ SELF_CHECK (format ("nothing") == "nothing");
+}
+
} /* namespace selftests */
void
_initialize_common_utils_selftests ()
{
selftests::register_test ("string_printf", selftests::string_printf_tests);
+ selftests::register_test ("string_vprintf", selftests::string_vprintf_tests);
}