diff --git a/crypto/bio/bio_lib.c b/crypto/bio/bio_lib.c
index 2bd337c36248db9e7926033ea97a770fec667cb0..c14e238ddc70283eb418ecda03d8db57095ff416 100644
--- a/crypto/bio/bio_lib.c
+++ b/crypto/bio/bio_lib.c
@@ -295,7 +295,7 @@ int BIO_read(BIO *b, void *data, int dlen)
     ret = bio_read_intern(b, data, (size_t)dlen, &readbytes);
 
     if (ret > 0) {
-        /* *readbytes should always be <= outl */
+        /* *readbytes should always be <= dlen */
         ret = (int)readbytes;
     }
 
@@ -362,7 +362,7 @@ int BIO_write(BIO *b, const void *data, int dlen)
     ret = bio_write_intern(b, data, (size_t)dlen, &written);
 
     if (ret > 0) {
-        /* *written should always be <= inl */
+        /* *written should always be <= dlen */
         ret = (int)written;
     }
 
@@ -383,7 +383,7 @@ int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written)
     return ret;
 }
 
-int BIO_puts(BIO *b, const char *in)
+int BIO_puts(BIO *b, const char *buf)
 {
     int ret;
     size_t written = 0;
@@ -394,7 +394,7 @@ int BIO_puts(BIO *b, const char *in)
     }
 
     if (b->callback != NULL || b->callback_ex != NULL) {
-        ret = (int)bio_call_callback(b, BIO_CB_PUTS, in, 0, 0, 0L, 1L, NULL);
+        ret = (int)bio_call_callback(b, BIO_CB_PUTS, buf, 0, 0, 0L, 1L, NULL);
         if (ret <= 0)
             return ret;
     }
@@ -404,7 +404,7 @@ int BIO_puts(BIO *b, const char *in)
         return -2;
     }
 
-    ret = b->method->bputs(b, in);
+    ret = b->method->bputs(b, buf);
 
     if (ret > 0) {
         b->num_write += (uint64_t)ret;
@@ -413,7 +413,7 @@ int BIO_puts(BIO *b, const char *in)
     }
 
     if (b->callback != NULL || b->callback_ex != NULL)
-        ret = (int)bio_call_callback(b, BIO_CB_PUTS | BIO_CB_RETURN, in, 0, 0,
+        ret = (int)bio_call_callback(b, BIO_CB_PUTS | BIO_CB_RETURN, buf, 0, 0,
                                      0L, ret, &written);
 
     if (ret > 0) {
@@ -428,7 +428,7 @@ int BIO_puts(BIO *b, const char *in)
     return ret;
 }
 
-int BIO_gets(BIO *b, char *out, int outl)
+int BIO_gets(BIO *b, char *buf, int size)
 {
     int ret;
     size_t readbytes = 0;
@@ -438,13 +438,13 @@ int BIO_gets(BIO *b, char *out, int outl)
         return (-2);
     }
 
-    if (outl < 0) {
+    if (size < 0) {
         BIOerr(BIO_F_BIO_GETS, BIO_R_INVALID_ARGUMENT);
         return 0;
     }
 
     if (b->callback != NULL || b->callback_ex != NULL) {
-        ret = (int)bio_call_callback(b, BIO_CB_GETS, out, outl, 0, 0L, 1, NULL);
+        ret = (int)bio_call_callback(b, BIO_CB_GETS, buf, size, 0, 0L, 1, NULL);
         if (ret <= 0)
             return ret;
     }
@@ -454,7 +454,7 @@ int BIO_gets(BIO *b, char *out, int outl)
         return (-2);
     }
 
-    ret = b->method->bgets(b, out, outl);
+    ret = b->method->bgets(b, buf, size);
 
     if (ret > 0) {
         readbytes = ret;
@@ -462,12 +462,12 @@ int BIO_gets(BIO *b, char *out, int outl)
     }
 
     if (b->callback != NULL || b->callback_ex != NULL)
-        ret = (int)bio_call_callback(b, BIO_CB_GETS | BIO_CB_RETURN, out, outl,
+        ret = (int)bio_call_callback(b, BIO_CB_GETS | BIO_CB_RETURN, buf, size,
                                      0, 0L, ret, &readbytes);
 
     if (ret > 0) {
         /* Shouldn't happen */
-        if (readbytes > (size_t)outl)
+        if (readbytes > (size_t)size)
             ret = -1;
         else
             ret = (int)readbytes;
diff --git a/doc/man3/BIO_read.pod b/doc/man3/BIO_read.pod
index 6baa075fc23bd74e23a3f345fd4762a0d52afdd9..bd9bb8fafd2550094b5f963b3ab05df403b9c19b 100644
--- a/doc/man3/BIO_read.pod
+++ b/doc/man3/BIO_read.pod
@@ -9,21 +9,21 @@ BIO_read_ex, BIO_write_ex, BIO_read, BIO_write, BIO_gets, BIO_puts
 
  #include <openssl/bio.h>
 
- int BIO_read_ex(BIO *b, void *out, size_t outl, size_t *read);
- int BIO_write_ex(BIO *b, const void *in, size_t inl, size_t *written);
+ int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *readbytes);
+ int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written);
 
- int BIO_read(BIO *b, void *buf, int len);
+ int BIO_read(BIO *b, void *data, int dlen);
  int BIO_gets(BIO *b, char *buf, int size);
- int BIO_write(BIO *b, const void *buf, int len);
+ int BIO_write(BIO *b, const void *data, int dlen);
  int BIO_puts(BIO *b, const char *buf);
 
 =head1 DESCRIPTION
 
-BIO_read_ex() attempts to read B<outl> bytes from BIO B<b> and places the data
-in B<out>. If any bytes were successfully read then the number of bytes read is
-stored in B<*read>.
+BIO_read_ex() attempts to read B<dlen> bytes from BIO B<b> and places the data
+in B<data>. If any bytes were successfully read then the number of bytes read is
+stored in B<*readbytes>.
 
-BIO_write_ex() attempts to write B<inl> bytes from B<in> to BIO B<b>. If
+BIO_write_ex() attempts to write B<dlen> bytes from B<data> to BIO B<b>. If
 successful then the number of bytes written is stored in B<*written>.
 
 BIO_read() attempts to read B<len> bytes from BIO B<b> and places
@@ -31,7 +31,7 @@ the data in B<buf>.
 
 BIO_gets() performs the BIOs "gets" operation and places the data
 in B<buf>. Usually this operation will attempt to read a line of data
-from the BIO of maximum length B<len-1>. There are exceptions to this,
+from the BIO of maximum length B<size-1>. There are exceptions to this,
 however; for example, BIO_gets() on a digest BIO will calculate and
 return the digest and other BIOs may not support BIO_gets() at all.
 The returned string is always NUL-terminated.
diff --git a/doc/man3/BIO_set_callback.pod b/doc/man3/BIO_set_callback.pod
index 6e5656fb7323b40e3e33958709f5a3bb44e88501..f53e7bdff562c545346bf3762c2c2d9fdeb65d5b 100644
--- a/doc/man3/BIO_set_callback.pod
+++ b/doc/man3/BIO_set_callback.pod
@@ -76,7 +76,7 @@ the value of B<oper>, that is the operation being performed.
 =item B<processed>
 
 B<processed> is a pointer to a location which will be updated with the amount of
-data that was actually read or written. Only used for BIO_CB_READ, BIO_CB_WRITE, 
+data that was actually read or written. Only used for BIO_CB_READ, BIO_CB_WRITE,
 BIO_CB_GETS and BIO_CB_PUTS.
 
 =item B<ret>
@@ -111,75 +111,75 @@ or
 
 is called before the free operation.
 
-=item B<BIO_read_ex(b, out, outl, read)>
+=item B<BIO_read_ex(b, data, dlen, readbytes)>
 
- callback_ex(b, BIO_CB_READ, out, outl, 0, 0L, 1L, read)
+ callback_ex(b, BIO_CB_READ, data, dlen, 0, 0L, 1L, readbytes)
 
 or
 
- callback(b, BIO_CB_READ, out, outl, 0L, 1L)
- 
+ callback(b, BIO_CB_READ, data, dlen, 0L, 1L)
+
 is called before the read and
 
- callback_ex(b, BIO_CB_READ | BIO_CB_RETURN, out, outl, 0, 0L, retvalue, read)
+ callback_ex(b, BIO_CB_READ | BIO_CB_RETURN, data, dlen, 0, 0L, retvalue, readbytes)
 
 or
 
- callback(b, BIO_CB_READ|BIO_CB_RETURN, out, outl, 0L, retvalue)
+ callback(b, BIO_CB_READ|BIO_CB_RETURN, data, dlen, 0L, retvalue)
 
 after.
 
-=item B<BIO_write(b, in, inl, written)>
+=item B<BIO_write(b, data, dlen, written)>
 
- callback_ex(b, BIO_CB_WRITE, in, inl, 0, 0L, 1L, written)
+ callback_ex(b, BIO_CB_WRITE, data, dlen, 0, 0L, 1L, written)
 
 or
 
- callback(b, BIO_CB_WRITE, in, inl, 0L, 1L)
+ callback(b, BIO_CB_WRITE, datat, dlen, 0L, 1L)
 
 is called before the write and
 
- callback_ex(b, BIO_CB_WRITE | BIO_CB_RETURN, in, inl, 0, 0L, retvalue, written)
+ callback_ex(b, BIO_CB_WRITE | BIO_CB_RETURN, data, dlen, 0, 0L, retvalue, written)
 
 or
 
- callback(b, BIO_CB_WRITE|BIO_CB_RETURN, in, inl, 0L, retvalue)
+ callback(b, BIO_CB_WRITE|BIO_CB_RETURN, data, dlen, 0L, retvalue)
 
 after.
 
-=item B<BIO_gets(b, out, outl)>
+=item B<BIO_gets(b, buf, size)>
 
- callback_ex(b, BIO_CB_GETS, out, outl, 0, 0L, 1, NULL, NULL)
+ callback_ex(b, BIO_CB_GETS, buf, size, 0, 0L, 1, NULL, NULL)
 
 or
 
- callback(b, BIO_CB_GETS, out, outl, 0L, 1L)
+ callback(b, BIO_CB_GETS, buf, size, 0L, 1L)
 
 is called before the operation and
 
- callback_ex(b, BIO_CB_GETS | BIO_CB_RETURN, out, outl, 0, 0L, retvalue, read)
+ callback_ex(b, BIO_CB_GETS | BIO_CB_RETURN, buf, size, 0, 0L, retvalue, readbytes)
 
 or
 
- callback(b, BIO_CB_GETS|BIO_CB_RETURN, out, outl, 0L, retvalue)
+ callback(b, BIO_CB_GETS|BIO_CB_RETURN, buf, size, 0L, retvalue)
 
 after.
 
-=item B<BIO_puts(b, in)>
+=item B<BIO_puts(b, buf)>
 
- callback_ex(b, BIO_CB_PUTS, in, 0, 0, 0L, 1L, NULL);
+ callback_ex(b, BIO_CB_PUTS, buf, 0, 0, 0L, 1L, NULL);
 
 or
 
- callback(b, BIO_CB_PUTS, in, 0, 0L, 1L)
+ callback(b, BIO_CB_PUTS, buf, 0, 0L, 1L)
 
 is called before the operation and
 
- callback_ex(b, BIO_CB_PUTS | BIO_CB_RETURN, in, 0, 0, 0L, retvalue, written)
+ callback_ex(b, BIO_CB_PUTS | BIO_CB_RETURN, buf, 0, 0, 0L, retvalue, written)
 
 or
 
- callback(b, BIO_CB_WRITE|BIO_CB_RETURN, in, 0, 0L, retvalue)
+ callback(b, BIO_CB_WRITE|BIO_CB_RETURN, buf, 0, 0L, retvalue)
 
 after.
 
@@ -198,7 +198,7 @@ is called before the call and
 or
 
  callback(b, BIO_CB_CTRL|BIO_CB_RETURN, parg, cmd, larg, ret)
- 
+
 after.
 
 =back
diff --git a/include/openssl/bio.h b/include/openssl/bio.h
index 4b807191efd8073baedcc77def1a722ad73fa4f9..2fb9023eac0279646289a8fddd05ab475f4c309d 100644
--- a/include/openssl/bio.h
+++ b/include/openssl/bio.h
@@ -552,7 +552,7 @@ int BIO_get_shutdown(BIO *a);
 void BIO_vfree(BIO *a);
 int BIO_up_ref(BIO *a);
 int BIO_read(BIO *b, void *data, int dlen);
-int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *read);
+int BIO_read_ex(BIO *b, void *data, size_t dlen, size_t *readbytes);
 int BIO_gets(BIO *bp, char *buf, int size);
 int BIO_write(BIO *b, const void *data, int dlen);
 int BIO_write_ex(BIO *b, const void *data, size_t dlen, size_t *written);