mdocml: Cache the result of uname(3) such that we don't need to call it

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
Cache the result of uname(3) such that we don't need to call it
over and over again for each manual; found with gprof(1).
Speeds up mandocdb(8) -Q by 3%, now at 39.5% of makewhatis(8).

Modified Files:
--------------
    mdocml:
        mdoc_validate.c

Revision Data
-------------
Index: mdoc_validate.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc_validate.c,v
retrieving revision 1.200
retrieving revision 1.201
diff -Lmdoc_validate.c -Lmdoc_validate.c -u -p -r1.200 -r1.201
--- mdoc_validate.c
+++ mdoc_validate.c
@@ -2348,12 +2348,13 @@ post_bx(POST_ARGS)
 static int
 post_os(POST_ARGS)
 {
-	struct mdoc_node *n;
 	char		  buf[BUFSIZ];
-	int		  c;
 #ifndef OSNAME
 	struct utsname	  utsname;
+	static char	 *defbuf;
 #endif
+	struct mdoc_node *n;
+	int		  c;
 
 	n = mdoc->last;
 
@@ -2376,39 +2377,31 @@ post_os(POST_ARGS)
 
 	assert(c);
 
-	if ('\0' == buf[0]) {
-		if (mdoc->defos) {
-			mdoc->meta.os = mandoc_strdup(mdoc->defos);
-			return(1);
-		}
+	if ('\0' != *buf) {
+		mdoc->meta.os = mandoc_strdup(buf);
+		return(1);
+	}
+
+	if (mdoc->defos) {
+		mdoc->meta.os = mandoc_strdup(mdoc->defos);
+		return(1);
+	}
+
 #ifdef OSNAME
-		if (strlcat(buf, OSNAME, BUFSIZ) >= BUFSIZ) {
-			mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
-			return(0);
-		}
+	mdoc->meta.os = mandoc_strdup(OSNAME);
 #else /*!OSNAME */
+	if (NULL == defbuf) {
 		if (-1 == uname(&utsname)) {
 			mdoc_nmsg(mdoc, n, MANDOCERR_UNAME);
-                        mdoc->meta.os = mandoc_strdup("UNKNOWN");
-                        return(post_prol(mdoc));
-                }
-
-		if (strlcat(buf, utsname.sysname, BUFSIZ) >= BUFSIZ) {
-			mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
-			return(0);
-		}
-		if (strlcat(buf, " ", BUFSIZ) >= BUFSIZ) {
-			mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
-			return(0);
-		}
-		if (strlcat(buf, utsname.release, BUFSIZ) >= BUFSIZ) {
-			mdoc_nmsg(mdoc, n, MANDOCERR_MEM);
-			return(0);
+                        defbuf = mandoc_strdup("UNKNOWN");
+                } else if (-1 == asprintf(&defbuf, "%s %s",
+		    utsname.sysname, utsname.release)) {
+			perror(NULL);
+			exit((int)MANDOCLEVEL_SYSERR);
 		}
-#endif /*!OSNAME*/
 	}
-
-	mdoc->meta.os = mandoc_strdup(buf);
+	mdoc->meta.os = mandoc_strdup(defbuf);
+#endif /*!OSNAME*/
 	return(1);
 }
 
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