SAA: add saa_wcstring()

Add saa_wcstring() to write a C string (a string including final NUL)
to an SAA, and return the number of bytes written.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

include/saa.h

@@ -70,6 +70,7 @@ struct SAA *saa_init(size_t elem_len);  /* 1 == byte */
 void saa_free(struct SAA *);
 void *saa_wstruct(struct SAA *);        /* return a structure of elem_len */
 void saa_wbytes(struct SAA *, const void *, size_t);    /* write arbitrary bytes */
+size_t saa_wcstring(struct SAA *s, const char *str);     /* write a C string */
 void saa_rewind(struct SAA *);  /* for reading from beginning */
 void *saa_rstruct(struct SAA *);        /* return NULL on EOA */
 const void *saa_rbytes(struct SAA *, size_t *); /* return 0 on EOA */

nasmlib/saa.c

@@ -1,6 +1,6 @@
 /* ----------------------------------------------------------------------- *
  *   
- *   Copyright 1996-2009 The NASM Authors - All Rights Reserved
+ *   Copyright 1996-2017 The NASM Authors - All Rights Reserved
  *   See the file AUTHORS included with the NASM distribution for
  *   the specific copyright holders.
  *
@@ -149,6 +149,19 @@ void saa_wbytes(struct SAA *s, const void *data, size_t len)
     }
 }
 
+/*
+ * Writes a string, *including* the final null, to the specified SAA,
+ * and return the number of bytes written.
+ */
+size_t saa_wcstring(struct SAA *s, const char *str)
+{
+    size_t bytes = strlen(str) + 1;
+
+    saa_wbytes(s, str, bytes);
+
+    return bytes;
+}
+
 void saa_rewind(struct SAA *s)
 {
     s->rblk = s->blk_ptrs;