Allow zero size with non-null buf in *asnprintf.

* libc/stdio/asnprintf.c (_asnprintf_r, asnprintf): Avoid free'ing
user's buf.
* libc/stdio/asniprintf.c (_asniprintf_r, asniprintf): Likewise.
* libc/stdio/vasniprintf.c (_vasniprintf_r): Likewise.
* libc/stdio/vasnprintf.c (_vasnprintf_r): Likewise.

4 files changed, 6 insertions, 0 deletions

diff --git a/newlib/libc/stdio/asniprintf.c b/newlib/libc/stdio/asniprintf.c
index 202d8c1..dd74b7c 100644
--- a/newlib/libc/stdio/asniprintf.c
+++ b/newlib/libc/stdio/asniprintf.c
@@ -34,6 +34,7 @@ _DEFUN(_asniprintf_r, (ptr, buf, lenp, fmt),
       /* mark a zero-length reallocatable buffer */
       f._flags = __SWR | __SSTR | __SMBF;
       len = 0;
+      buf = NULL;
     }
   f._bf._base = f._p = (unsigned char *) buf;
   /* For now, inherit the 32-bit signed limit of FILE._bf._size.
@@ -80,6 +81,7 @@ _DEFUN(asniprintf, (buf, lenp, fmt),
       /* mark a zero-length reallocatable buffer */
       f._flags = __SWR | __SSTR | __SMBF;
       len = 0;
+      buf = NULL;
     }
   f._bf._base = f._p = (unsigned char *) buf;
   /* For now, inherit the 32-bit signed limit of FILE._bf._size.
diff --git a/newlib/libc/stdio/asnprintf.c b/newlib/libc/stdio/asnprintf.c
index 78d10e8..ef9bd89 100644
--- a/newlib/libc/stdio/asnprintf.c
+++ b/newlib/libc/stdio/asnprintf.c
@@ -34,6 +34,7 @@ _DEFUN(_asnprintf_r, (ptr, buf, lenp, fmt),
       /* mark a zero-length reallocatable buffer */
       f._flags = __SWR | __SSTR | __SMBF;
       len = 0;
+      buf = NULL;
     }
   f._bf._base = f._p = (unsigned char *) buf;
   /* For now, inherit the 32-bit signed limit of FILE._bf._size.
@@ -80,6 +81,7 @@ _DEFUN(asnprintf, (buf, lenp, fmt),
       /* mark a zero-length reallocatable buffer */
       f._flags = __SWR | __SSTR | __SMBF;
       len = 0;
+      buf = NULL;
     }
   f._bf._base = f._p = (unsigned char *) buf;
   /* For now, inherit the 32-bit signed limit of FILE._bf._size.
diff --git a/newlib/libc/stdio/vasniprintf.c b/newlib/libc/stdio/vasniprintf.c
index eff6dfd..1e5d600 100644
--- a/newlib/libc/stdio/vasniprintf.c
+++ b/newlib/libc/stdio/vasniprintf.c
@@ -34,6 +34,7 @@ _DEFUN(_vasniprintf_r, (ptr, buf, lenp, fmt, ap),
       /* mark a zero-length reallocatable buffer */
       f._flags = __SWR | __SSTR | __SMBF;
       len = 0;
+      buf = NULL;
     }
   f._bf._base = f._p = (unsigned char *) buf;
   /* For now, inherit the 32-bit signed limit of FILE._bf._size.
diff --git a/newlib/libc/stdio/vasnprintf.c b/newlib/libc/stdio/vasnprintf.c
index 923ed83..740aa07 100644
--- a/newlib/libc/stdio/vasnprintf.c
+++ b/newlib/libc/stdio/vasnprintf.c
@@ -34,6 +34,7 @@ _DEFUN(_vasnprintf_r, (ptr, buf, lenp, fmt, ap),
       /* mark a zero-length reallocatable buffer */
       f._flags = __SWR | __SSTR | __SMBF;
       len = 0;
+      buf = NULL;
     }
   f._bf._base = f._p = (unsigned char *) buf;
   /* For now, inherit the 32-bit signed limit of FILE._bf._size.