Fix all sign/unsigned warnings with Clang and GCC. Change-Id: If2a83698236f7b0dcd46701ccd257a85463d6ce5 Reviewed-on: https://boringssl-review.googlesource.com/4992 Reviewed-by: Adam Langley <agl@google.com>

diff --git a/crypto/bio/bio.c b/crypto/bio/bio.c
index 4bc98ba..7a1a9e3 100644
--- a/crypto/bio/bio.c
+++ b/crypto/bio/bio.c

@@ -529,7 +529,7 @@
   uint8_t header[6];
 
   static const size_t kInitialHeaderLen = 2;
-  if (BIO_read(bio, header, kInitialHeaderLen) != kInitialHeaderLen) {
+  if (BIO_read(bio, header, kInitialHeaderLen) != (int) kInitialHeaderLen) {
     return 0;
   }
 
@@ -559,7 +559,8 @@
       return 0;
     }
 
-    if (BIO_read(bio, header + kInitialHeaderLen, num_bytes) != num_bytes) {
+    if (BIO_read(bio, header + kInitialHeaderLen, num_bytes) !=
+        (int)num_bytes) {
       return 0;
     }
     header_len = kInitialHeaderLen + num_bytes;
@@ -585,7 +586,8 @@
   }
 
   if (len + header_len < len ||
-      len + header_len > max_len) {
+      len + header_len > max_len ||
+      len > INT_MAX) {
     return 0;
   }
   len += header_len;
@@ -597,7 +599,7 @@
   }
   memcpy(*out, header, header_len);
   if (BIO_read(bio, (*out) + header_len, len - header_len) !=
-      len - header_len) {
+      (int) (len - header_len)) {
     OPENSSL_free(*out);
     return 0;
   }

diff --git a/crypto/bio/bio_mem.c b/crypto/bio/bio_mem.c
index ef56111..6864f6f 100644
--- a/crypto/bio/bio_mem.c
+++ b/crypto/bio/bio_mem.c

@@ -176,7 +176,7 @@
   if (INT_MAX - blen < inl) {
     goto err;
   }
-  if (BUF_MEM_grow_clean(b, blen + inl) != (blen + inl)) {
+  if (BUF_MEM_grow_clean(b, blen + inl) != ((size_t) blen) + inl) {
     goto err;
   }
   memcpy(&b->data[blen], in, inl);

diff --git a/crypto/bio/printf.c b/crypto/bio/printf.c
index 2f5ae4a..3709fcb 100644
--- a/crypto/bio/printf.c
+++ b/crypto/bio/printf.c

@@ -87,7 +87,11 @@
   }
 #endif
 
-  if (out_len >= sizeof(buf)) {
+  if (out_len < 0) {
+    return -1;
+  }
+
+  if ((size_t) out_len >= sizeof(buf)) {
     const int requested_len = out_len;
     /* The output was truncated. Note that vsnprintf's return value
      * does not include a trailing NUL, but the buffer must be sized