Merged revisions 247335 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

........
  r247335 | mmichelson | 2010-02-17 15:22:40 -0600 (Wed, 17 Feb 2010) | 20 lines
  
  Fix two problems in ast_str functions found while writing a unit test.
  
  1. The documentation for ast_str_set and ast_str_append state that
  the max_len parameter may be -1 in order to limit the size of the
  ast_str to its current allocated size. The problem was that the max_len
  parameter in all cases was a size_t, which is unsigned. Thus a -1 was
  interpreted as UINT_MAX instead of -1. Changing the max_len parameter
  to be ssize_t fixed this issue.
  
  2. Once issue 1 was fixed, there was an off-by-one error in the case
  where we attempted to write a string larger than the current allotted
  size to a string when -1 was passed as the max_len parameter. When trying
  to write more than the allotted size, the ast_str's __AST_STR_USED was
  set to 1 higher than it should have been. Thanks to Tilghman for quickly
  spotting the offending line of code.
  
  Oh, and the unit test that I referenced in the top line of this commit
  will be added to reviewboard shortly. Sit tight...
........


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.1@247336 f38db490-d61c-443f-a65b-d21fe96a405b

2 files changed, 7 insertions, 7 deletions

diff --git a/include/asterisk/strings.h b/include/asterisk/strings.h
index 1e78c04c7..143859302 100644
--- a/include/asterisk/strings.h
+++ b/include/asterisk/strings.h
@@ -592,7 +592,7 @@ enum {
  *       through calling one of the other functions or macros defined in this
  *       file.
  */
-int __attribute__((format(printf, 4, 0))) __ast_str_helper(struct ast_str **buf, size_t max_len,
+int __attribute__((format(printf, 4, 0))) __ast_str_helper(struct ast_str **buf, ssize_t max_len,
 							   int append, const char *fmt, va_list ap);
 
 /*!
@@ -633,7 +633,7 @@ int __attribute__((format(printf, 4, 0))) __ast_str_helper(struct ast_str **buf,
  * }
  * \endcode
  */
-AST_INLINE_API(int __attribute__((format(printf, 3, 0))) ast_str_set_va(struct ast_str **buf, size_t max_len, const char *fmt, va_list ap),
+AST_INLINE_API(int __attribute__((format(printf, 3, 0))) ast_str_set_va(struct ast_str **buf, ssize_t max_len, const char *fmt, va_list ap),
 {
 	return __ast_str_helper(buf, max_len, 0, fmt, ap);
 }
@@ -644,7 +644,7 @@ AST_INLINE_API(int __attribute__((format(printf, 3, 0))) ast_str_set_va(struct a
  *
  * Same as ast_str_set_va(), but append to the current content.
  */
-AST_INLINE_API(int __attribute__((format(printf, 3, 0))) ast_str_append_va(struct ast_str **buf, size_t max_len, const char *fmt, va_list ap),
+AST_INLINE_API(int __attribute__((format(printf, 3, 0))) ast_str_append_va(struct ast_str **buf, ssize_t max_len, const char *fmt, va_list ap),
 {
 	return __ast_str_helper(buf, max_len, 1, fmt, ap);
 }
@@ -669,7 +669,7 @@ AST_INLINE_API(int __attribute__((format(printf, 3, 0))) ast_str_append_va(struc
  */
 AST_INLINE_API(
 int __attribute__((format(printf, 3, 4))) ast_str_set(
-	struct ast_str **buf, size_t max_len, const char *fmt, ...),
+	struct ast_str **buf, ssize_t max_len, const char *fmt, ...),
 {
 	int res;
 	va_list ap;
@@ -690,7 +690,7 @@ int __attribute__((format(printf, 3, 4))) ast_str_set(
  */
 AST_INLINE_API(
 int __attribute__((format(printf, 3, 4))) ast_str_append(
-	struct ast_str **buf, size_t max_len, const char *fmt, ...),
+	struct ast_str **buf, ssize_t max_len, const char *fmt, ...),
 {
 	int res;
 	va_list ap;
diff --git a/main/utils.c b/main/utils.c
index f82c20f29..54300a364 100644
--- a/main/utils.c
+++ b/main/utils.c
@@ -1762,7 +1762,7 @@ int ast_get_time_t(const char *src, time_t *dst, time_t _default, int *consumed)
  *	ast_str_append_va(...)
  */
 
-int __ast_str_helper(struct ast_str **buf, size_t max_len,
+int __ast_str_helper(struct ast_str **buf, ssize_t max_len,
 	int append, const char *fmt, va_list ap)
 {
 	int res, need;
@@ -1809,7 +1809,7 @@ int __ast_str_helper(struct ast_str **buf, size_t max_len,
 		break;
 	} while (1);
 	/* update space used, keep in mind the truncation */
-	(*buf)->used = (res + offset > (*buf)->len) ? (*buf)->len : res + offset;
+	(*buf)->used = (res + offset > (*buf)->len) ? (*buf)->len - 1 : res + offset;
 
 	return res;
 }