[src/trunk]: src/usr.bin/make make(1): extract DetermineKindOfConditional fro...

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

details:   https://anonhg.NetBSD.org/src/rev/34092acf8766
branches:  trunk
changeset: 980018:34092acf8766
user:      rillig <rillig%NetBSD.org@localhost>
date:      Tue Jan 19 22:12:44 2021 +0000

description:
make(1): extract DetermineKindOfConditional from Cond_EvalLine

diffstat:

 usr.bin/make/cond.c |  71 +++++++++++++++++++++++++++++-----------------------
 1 files changed, 40 insertions(+), 31 deletions(-)

diffs (100 lines):

diff -r e3d6b2d76000 -r 34092acf8766 usr.bin/make/cond.c
--- a/usr.bin/make/cond.c       Tue Jan 19 21:55:20 2021 +0000
+++ b/usr.bin/make/cond.c       Tue Jan 19 22:12:44 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cond.c,v 1.243 2021/01/19 21:55:20 rillig Exp $        */
+/*     $NetBSD: cond.c,v 1.244 2021/01/19 22:12:44 rillig Exp $        */
 
 /*
  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
@@ -95,7 +95,7 @@
 #include "dir.h"
 
 /*     "@(#)cond.c     8.2 (Berkeley) 1/2/94"  */
-MAKE_RCSID("$NetBSD: cond.c,v 1.243 2021/01/19 21:55:20 rillig Exp $");
+MAKE_RCSID("$NetBSD: cond.c,v 1.244 2021/01/19 22:12:44 rillig Exp $");
 
 /*
  * The parsing of conditional expressions is based on this grammar:
@@ -1061,6 +1061,43 @@
               p[3] == 'i' && p[4] == 'f' && !ch_isalpha(p[5]);
 }
 
+static Boolean
+DetermineKindOfConditional(const char **pp, Boolean *out_plain,
+                          Boolean (**out_evalBare)(size_t, const char *),
+                          Boolean *out_negate)
+{
+       const char *p = *pp;
+
+       p += 2;
+       *out_plain = FALSE;
+       *out_evalBare = FuncDefined;
+       *out_negate = FALSE;
+       if (*p == 'n') {
+               p++;
+               *out_negate = TRUE;
+       }
+       if (is_token(p, "def", 3)) {            /* .ifdef and .ifndef */
+               p += 3;
+       } else if (is_token(p, "make", 4)) {    /* .ifmake and .ifnmake */
+               p += 4;
+               *out_evalBare = FuncMake;
+       } else if (is_token(p, "", 0) && !*out_negate) { /* plain .if */
+               *out_plain = TRUE;
+       } else {
+               /*
+                * TODO: Add error message about unknown directive,
+                * since there is no other known directive that starts
+                * with 'el' or 'if'.
+                *
+                * Example: .elifx 123
+                */
+               return FALSE;
+       }
+
+       *pp = p;
+       return TRUE;
+}
+
 /*
  * Evaluate the conditional directive in the line, which is one of:
  *
@@ -1199,36 +1236,8 @@
                return COND_INVALID;    /* Not an ifxxx or elifxxx line */
        }
 
-       /*
-        * Figure out what sort of conditional it is.
-        */
-       p += 2;
-       plain = FALSE;
-       evalBare = FuncDefined;
-       negate = FALSE;
-       if (*p == 'n') {
-               p++;
-               negate = TRUE;
-       }
-       if (is_token(p, "def", 3)) {            /* .ifdef and .ifndef */
-               p += 3;
-       } else if (is_token(p, "make", 4)) {    /* .ifmake and .ifnmake */
-               p += 4;
-               evalBare = FuncMake;
-       } else if (is_token(p, "", 0) && !negate) {     /* plain .if */
-               plain = TRUE;
-       } else {
-               /*
-                * TODO: Add error message about unknown directive,
-                * since there is no other known directive that starts
-                * with 'el' or 'if'.
-                *
-                * Example: .elifx 123
-                */
+       if (!DetermineKindOfConditional(&p, &plain, &evalBare, &negate))
                return COND_INVALID;
-       }
-
-       /* Now we know what sort of 'if' it is... */
 
        if (isElif) {
                if (cond_depth == cond_min_depth) {