[src/trunk]: src/usr.bin/make make(1): extract ParseVarname from Var_Parse

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b387b1dce13f
branches:  trunk
changeset: 1014134:b387b1dce13f
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Sep 12 19:24:59 2020 +0000

description:
make(1): extract ParseVarname from Var_Parse

This was an easy part since it affects only a few variables.  250 lines
for a single function is still quite a lot, so further refactorings will
follow.

diffstat:

 usr.bin/make/var.c |  67 ++++++++++++++++++++++++++++++-----------------------
 1 files changed, 38 insertions(+), 29 deletions(-)

diffs (108 lines):

diff -r eab9905a9695 -r b387b1dce13f usr.bin/make/var.c
--- a/usr.bin/make/var.c        Sat Sep 12 19:15:20 2020 +0000
+++ b/usr.bin/make/var.c        Sat Sep 12 19:24:59 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.500 2020/09/12 19:15:20 rillig Exp $ */
+/*     $NetBSD: var.c,v 1.501 2020/09/12 19:24:59 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -69,14 +69,14 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: var.c,v 1.500 2020/09/12 19:15:20 rillig Exp $";
+static char rcsid[] = "$NetBSD: var.c,v 1.501 2020/09/12 19:24:59 rillig Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
 #if 0
 static char sccsid[] = "@(#)var.c      8.3 (Berkeley) 3/19/94";
 #else
-__RCSID("$NetBSD: var.c,v 1.500 2020/09/12 19:15:20 rillig Exp $");
+__RCSID("$NetBSD: var.c,v 1.501 2020/09/12 19:24:59 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -3302,6 +3302,38 @@
     return FALSE;
 }
 
+/* Skip to the end character or a colon, whichever comes first. */
+static void
+ParseVarname(const char **pp, char startc, char endc,
+            GNode *ctxt, VarEvalFlags eflags, Buffer *namebuf)
+{
+    const char *p = *pp;
+    int depth = 1;
+
+    while (*p != '\0') {
+       /* Track depth so we can spot parse errors. */
+       if (*p == startc)
+           depth++;
+       if (*p == endc) {
+           if (--depth == 0)
+               break;
+       }
+       if (*p == ':' && depth == 1)
+           break;
+       /* A variable inside a variable, expand. */
+       if (*p == '$') {
+           void *freeIt;
+           const char *rval = Var_Parse(&p, ctxt, eflags, &freeIt);
+           Buf_AddStr(namebuf, rval);
+           free(freeIt);
+       } else {
+           Buf_AddByte(namebuf, *p);
+           p++;
+       }
+    }
+    *pp = p;
+}
+
 /*-
  *-----------------------------------------------------------------------
  * Var_Parse --
@@ -3427,7 +3459,6 @@
        }
     } else {
        Buffer namebuf;         /* Holds the variable name */
-       int depth;
        size_t namelen;
        char *varname;
 
@@ -3435,31 +3466,9 @@
 
        Buf_Init(&namebuf, 0);
 
-       /*
-        * Skip to the end character or a colon, whichever comes first.
-        */
-       depth = 1;
-       for (p = start + 2; *p != '\0';) {
-           /* Track depth so we can spot parse errors. */
-           if (*p == startc)
-               depth++;
-           if (*p == endc) {
-               if (--depth == 0)
-                   break;
-           }
-           if (*p == ':' && depth == 1)
-               break;
-           /* A variable inside a variable, expand. */
-           if (*p == '$') {
-               void *freeIt;
-               const char *rval = Var_Parse(&p, ctxt, eflags, &freeIt);
-               Buf_AddStr(&namebuf, rval);
-               free(freeIt);
-           } else {
-               Buf_AddByte(&namebuf, *p);
-               p++;
-           }
-       }
+       p = start + 2;
+       ParseVarname(&p, startc, endc, ctxt, eflags, &namebuf);
+
        if (*p == ':') {
            haveModifier = TRUE;
        } else if (*p == endc) {