[newlib-cygwin] Fix some Coverity Scan errors.

[Jeff Johnston <jjohnstn@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=d92d3a3c4a7af1ebe56d58c32986ab410f6071ec

commit d92d3a3c4a7af1ebe56d58c32986ab410f6071ec
Author: Jeff Johnston <jjohnstn@redhat.com>
Date:   Wed Aug 31 15:18:08 2022 -0400

    Fix some Coverity Scan errors.

Diff:
---
 newlib/libc/posix/sleep.c       | 3 ++-
 newlib/libc/posix/usleep.c      | 1 -
 newlib/libc/stdio/swscanf.c     | 2 ++
 newlib/libc/stdio/vswscanf.c    | 2 ++
 newlib/libc/stdlib/arc4random.c | 2 ++
 newlib/libc/time/time.c         | 2 ++
 6 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/newlib/libc/posix/sleep.c b/newlib/libc/posix/sleep.c
index f7c780ef0..0d6cd710d 100644
--- a/newlib/libc/posix/sleep.c
+++ b/newlib/libc/posix/sleep.c
@@ -7,6 +7,7 @@
 #include <errno.h>
 #include <time.h>
 #include <unistd.h>
+#include <limits.h>
 
 unsigned sleep(unsigned seconds)
 {
@@ -15,7 +16,7 @@ unsigned sleep(unsigned seconds)
     ts.tv_sec = seconds;
     ts.tv_nsec = 0;
     if (!nanosleep(&ts,&ts)) return 0;
-    if (errno == EINTR) return ts.tv_sec;
+    if (errno == EINTR) return ts.tv_sec & UINT_MAX;
     return -1;
 }
 
diff --git a/newlib/libc/posix/usleep.c b/newlib/libc/posix/usleep.c
index 9322b6551..cc1b31408 100644
--- a/newlib/libc/posix/usleep.c
+++ b/newlib/libc/posix/usleep.c
@@ -15,7 +15,6 @@ int usleep(useconds_t useconds)
     ts.tv_sec = (long int)useconds / 1000000;
     ts.tv_nsec = ((long int)useconds % 1000000) * 1000;
     if (!nanosleep(&ts,&ts)) return 0;
-    if (errno == EINTR) return ts.tv_sec;
     return -1;
 }
 
diff --git a/newlib/libc/stdio/swscanf.c b/newlib/libc/stdio/swscanf.c
index 5514e68c0..578ac3c93 100644
--- a/newlib/libc/stdio/swscanf.c
+++ b/newlib/libc/stdio/swscanf.c
@@ -427,6 +427,8 @@ swscanf (const wchar_t *__restrict str, const wchar_t *__restrict fmt, ...)
   f._read = __seofread;
   f._ub._base = NULL;
   f._lb._base = NULL;
+  f._flags2 = 0;
+  f._ur = 0;
   f._file = -1;  /* No file. */
   va_start (ap, fmt);
   ret = __ssvfwscanf_r (_REENT, &f, fmt, ap);
diff --git a/newlib/libc/stdio/vswscanf.c b/newlib/libc/stdio/vswscanf.c
index 13b61f4a3..415c98b0f 100644
--- a/newlib/libc/stdio/vswscanf.c
+++ b/newlib/libc/stdio/vswscanf.c
@@ -53,6 +53,8 @@ _vswscanf_r (struct _reent *ptr, const wchar_t *str, const wchar_t *fmt,
   f._read = __seofread;
   f._ub._base = NULL;
   f._lb._base = NULL;
+  f._flags2 = 0;
+  f._ur = 0;
   f._file = -1;  /* No file. */
   return __ssvfwscanf_r (ptr, &f, fmt, ap);
 }
diff --git a/newlib/libc/stdlib/arc4random.c b/newlib/libc/stdlib/arc4random.c
index 5860d644a..7bd9e7c5e 100644
--- a/newlib/libc/stdlib/arc4random.c
+++ b/newlib/libc/stdlib/arc4random.c
@@ -86,6 +86,8 @@ _rs_stir(void)
 {
 	u_char rnd[KEYSZ + IVSZ];
 
+	memset(rnd, 0, (KEYSZ + IVSZ) * sizeof(u_char));
+
 	if (getentropy(rnd, sizeof rnd) == -1)
 		_getentropy_fail();
 
diff --git a/newlib/libc/time/time.c b/newlib/libc/time/time.c
index 93e061b83..b431f7ae5 100644
--- a/newlib/libc/time/time.c
+++ b/newlib/libc/time/time.c
@@ -37,6 +37,8 @@ time (time_t * t)
 {
   struct timeval now;
 
+  now.tv_sec = (time_t) -1;
+
   if (_gettimeofday_r (_REENT, &now, NULL) < 0)
     now.tv_sec = (time_t) -1;