Use va_copy for stringfields

The ast_string_field_build_va functions were written to take to separate
va_lists to work around FreeBSD 4 not having va_copy defined.

In the end, we don't support anything using gcc < 3 anyway because we use
va_copy all over the place anyway. This patch just simplifies things by
removing the second va_list function arguments in favor of va_copy.

Review: https://reviewboard.asterisk.org/r/1233/
--This line, and those below, will be ignored--

M    include/asterisk/stringfields.h
M    main/utils.c
M    main/channel.c


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@320946 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/stringfields.h

@@ -205,7 +205,7 @@ void __ast_string_field_ptr_build(struct ast_string_field_mgr *mgr,
 */
 void __ast_string_field_ptr_build_va(struct ast_string_field_mgr *mgr,
 				     struct ast_string_field_pool **pool_head,
-				     ast_string_field *ptr, const char *format, va_list a1, va_list a2) __attribute__((format(printf, 4, 0)));
+				     ast_string_field *ptr, const char *format, va_list ap) __attribute__((format(printf, 4, 0)));
 
 /*!
   \brief Declare a string field
@@ -369,8 +369,8 @@ typedef uint16_t ast_string_field_allocation;
   \param args2 a second copy of the va_list for the sake of bsd, with no va_list copy operation
   \return nothing
 */
-#define ast_string_field_ptr_build_va(x, ptr, fmt, args1, args2) \
-	__ast_string_field_ptr_build_va(&(x)->__field_mgr, &(x)->__field_mgr_pool, (ast_string_field *) ptr, fmt, args1, args2)
+#define ast_string_field_ptr_build_va(x, ptr, fmt, args) \
+	__ast_string_field_ptr_build_va(&(x)->__field_mgr, &(x)->__field_mgr_pool, (ast_string_field *) ptr, fmt, args)
 
 /*!
   \brief Set a field to a complex (built) value
@@ -381,7 +381,7 @@ typedef uint16_t ast_string_field_allocation;
   \param args2 argument two
   \return nothing
 */
-#define ast_string_field_build_va(x, field, fmt, args1, args2) \
-	__ast_string_field_ptr_build_va(&(x)->__field_mgr, &(x)->__field_mgr_pool, (ast_string_field *) &(x)->field, fmt, args1, args2)
+#define ast_string_field_build_va(x, field, fmt, args) \
+	__ast_string_field_ptr_build_va(&(x)->__field_mgr, &(x)->__field_mgr_pool, (ast_string_field *) &(x)->field, fmt, args)
 
 #endif /* _ASTERISK_STRINGFIELDS_H */

main/channel.c

@@ -1118,7 +1118,7 @@ static struct ast_channel * attribute_malloc __attribute__((format(printf, 13, 0
 __ast_channel_alloc_ap(int needqueue, int state, const char *cid_num, const char *cid_name,
 		       const char *acctcode, const char *exten, const char *context,
 		       const char *linkedid, const int amaflag, const char *file, int line,
-		       const char *function, const char *name_fmt, va_list ap1, va_list ap2)
+		       const char *function, const char *name_fmt, va_list ap)
 {
 	struct ast_channel *tmp;
 	int x;
@@ -1263,7 +1263,7 @@ __ast_channel_alloc_ap(int needqueue, int state, const char *cid_num, const char
 		 * uses them to build the string, instead of forming the va_lists internally from the vararg ... list.
 		 * This new function was written so this can be accomplished.
 		 */
-		ast_string_field_build_va(tmp, name, name_fmt, ap1, ap2);
+		ast_string_field_build_va(tmp, name, name_fmt, ap);
 		tech = ast_strdupa(tmp->name);
 		if ((slash = strchr(tech, '/'))) {
 			if ((slash2 = strchr(slash + 1, '/'))) {
@@ -1362,15 +1362,13 @@ struct ast_channel *__ast_channel_alloc(int needqueue, int state, const char *ci
 					const char *file, int line, const char *function,
 					const char *name_fmt, ...)
 {
-	va_list ap1, ap2;
+	va_list ap;
 	struct ast_channel *result;
 
-	va_start(ap1, name_fmt);
-	va_start(ap2, name_fmt);
+	va_start(ap, name_fmt);
 	result = __ast_channel_alloc_ap(needqueue, state, cid_num, cid_name, acctcode, exten, context,
-					linkedid, amaflag, file, line, function, name_fmt, ap1, ap2);
-	va_end(ap1);
-	va_end(ap2);
+					linkedid, amaflag, file, line, function, name_fmt, ap);
+	va_end(ap);
 
 	return result;
 }
@@ -9584,16 +9582,14 @@ struct ast_channel *ast_channel_alloc(int needqueue, int state, const char *cid_
 				      const char *linkedid, const int amaflag,
 				      const char *name_fmt, ...)
 {
-	va_list ap1, ap2;
+	va_list ap;
 	struct ast_channel *result;
 
 
-	va_start(ap1, name_fmt);
-	va_start(ap2, name_fmt);
+	va_start(ap, name_fmt);
 	result = __ast_channel_alloc_ap(needqueue, state, cid_num, cid_name, acctcode, exten, context,
-					linkedid, amaflag, __FILE__, __LINE__, __FUNCTION__, name_fmt, ap1, ap2);
-	va_end(ap1);
-	va_end(ap2);
+					linkedid, amaflag, __FILE__, __LINE__, __FUNCTION__, name_fmt, ap);
+	va_end(ap);
 
 	return result;
 }

main/utils.c

@@ -1733,13 +1733,14 @@ void __ast_string_field_release_active(struct ast_string_field_pool *pool_head,
 
 void __ast_string_field_ptr_build_va(struct ast_string_field_mgr *mgr,
 				     struct ast_string_field_pool **pool_head,
-				     ast_string_field *ptr, const char *format, va_list ap1, va_list ap2)
+				     ast_string_field *ptr, const char *format, va_list ap)
 {
 	size_t needed;
 	size_t available;
 	size_t space = (*pool_head)->size - (*pool_head)->used;
 	ssize_t grow;
 	char *target;
+	va_list ap2;
 
 	/* if the field already has space allocated, try to reuse it;
 	   otherwise, try to use the empty space at the end of the current
@@ -1762,9 +1763,9 @@ void __ast_string_field_ptr_build_va(struct ast_string_field_mgr *mgr,
 		available = space - sizeof(ast_string_field_allocation);
 	}
 
-	needed = vsnprintf(target, available, format, ap1) + 1;
-
-	va_end(ap1);
+	va_copy(ap2, ap);
+	needed = vsnprintf(target, available, format, ap2) + 1;
+	va_end(ap2);
 
 	if (needed > available) {
 		/* the allocation could not be satisfied using the field's current allocation
@@ -1774,7 +1775,8 @@ void __ast_string_field_ptr_build_va(struct ast_string_field_mgr *mgr,
 		if (!(target = (char *) __ast_string_field_alloc_space(mgr, pool_head, needed))) {
 			return;
 		}
-		vsprintf(target, format, ap2);
+		vsprintf(target, format, ap);
+		va_end(ap);
 		__ast_string_field_release_active(*pool_head, *ptr);
 		*ptr = target;
 	} else if (*ptr != target) {
@@ -1800,15 +1802,11 @@ void __ast_string_field_ptr_build(struct ast_string_field_mgr *mgr,
 				  struct ast_string_field_pool **pool_head,
 				  ast_string_field *ptr, const char *format, ...)
 {
-	va_list ap1, ap2;
-
-	va_start(ap1, format);
-	va_start(ap2, format);		/* va_copy does not exist on FreeBSD */
-
-	__ast_string_field_ptr_build_va(mgr, pool_head, ptr, format, ap1, ap2);
+	va_list ap;
 
-	va_end(ap1);
-	va_end(ap2);
+	va_start(ap, format);
+	__ast_string_field_ptr_build_va(mgr, pool_head, ptr, format, ap);
+	va_end(ap);
 }
 
 void *__ast_calloc_with_stringfields(unsigned int num_structs, size_t struct_size, size_t field_mgr_offset,