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Introduce string_vprintf

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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.
This commit is contained in:
Tom Tromey
2017-09-28 07:44:50 -06:00
parent 8b5b252959
commit bd413795d3
4 changed files with 56 additions and 0 deletions
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21
gdb/common/common-utils.c
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@ -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)
{