[src/trunk]: src/usr.bin/make make(1): clean up For_Eval

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

details:   https://anonhg.NetBSD.org/src/rev/22e26e072a97
branches:  trunk
changeset: 943584:22e26e072a97
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Sep 06 19:28:49 2020 +0000

description:
make(1): clean up For_Eval

* Reduce scope of local variables.
* Remove unnecessary null character test before positive isspace call.

diffstat:

 usr.bin/make/for.c |  51 ++++++++++++++++++++++++++++-----------------------
 1 files changed, 28 insertions(+), 23 deletions(-)

diffs (135 lines):

diff -r c6b6d263c518 -r 22e26e072a97 usr.bin/make/for.c
--- a/usr.bin/make/for.c        Sun Sep 06 19:24:12 2020 +0000
+++ b/usr.bin/make/for.c        Sun Sep 06 19:28:49 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: for.c,v 1.71 2020/09/06 19:24:12 rillig Exp $  */
+/*     $NetBSD: for.c,v 1.72 2020/09/06 19:28:49 rillig Exp $  */
 
 /*
  * Copyright (c) 1992, The Regents of the University of California.
@@ -30,14 +30,14 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: for.c,v 1.71 2020/09/06 19:24:12 rillig Exp $";
+static char rcsid[] = "$NetBSD: for.c,v 1.72 2020/09/06 19:28:49 rillig Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
 #if 0
 static char sccsid[] = "@(#)for.c      8.1 (Berkeley) 6/6/93";
 #else
-__RCSID("$NetBSD: for.c,v 1.71 2020/09/06 19:24:12 rillig Exp $");
+__RCSID("$NetBSD: for.c,v 1.72 2020/09/06 19:28:49 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -123,14 +123,11 @@
 For_Eval(char *line)
 {
     For *new_for;
-    char *ptr = line, *sub;
-    size_t len;
-    int escapes;
-    unsigned char ch;
+    const char *ptr;
     Words words;
 
     /* Skip the '.' and any following whitespace */
-    for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
+    for (ptr = line + 1; isspace((unsigned char)*ptr); ptr++)
        continue;
 
     /*
@@ -160,14 +157,17 @@
     new_for->sub_next = 0;
 
     /* Grab the variables. Terminate on "in". */
-    for (;; ptr += len) {
-       while (*ptr && isspace((unsigned char)*ptr))
+    while (TRUE) {
+       size_t len;
+
+       while (isspace((unsigned char)*ptr))
            ptr++;
        if (*ptr == '\0') {
            Parse_Error(PARSE_FATAL, "missing `in' in for");
            For_Free(new_for);
            return -1;
        }
+
        for (len = 1; ptr[len] && !isspace((unsigned char)ptr[len]); len++)
            continue;
        if (len == 2 && ptr[0] == 'i' && ptr[1] == 'n') {
@@ -178,6 +178,7 @@
            new_for->short_var = TRUE;
 
        strlist_add_str(&new_for->vars, bmake_strldup(ptr, len), len);
+       ptr += len;
     }
 
     if (strlist_num(&new_for->vars) == 0) {
@@ -186,7 +187,7 @@
        return -1;
     }
 
-    while (*ptr && isspace((unsigned char)*ptr))
+    while (isspace((unsigned char)*ptr))
        ptr++;
 
     /*
@@ -197,21 +198,21 @@
      * We can't do the escapes here - because we don't know whether
      * we will be substituting into ${...} or $(...).
      */
-    sub = Var_Subst(ptr, VAR_GLOBAL, VARE_WANTRES);
-
-    /*
-     * Split into words allowing for quoted strings.
-     */
-    words = Str_Words(sub, FALSE);
-
-    free(sub);
+    {
+       char *items = Var_Subst(ptr, VAR_GLOBAL, VARE_WANTRES);
+       words = Str_Words(items, FALSE);
+       free(items);
+    }
 
     {
-        size_t n;
+       size_t n;
 
        for (n = 0; n < words.len; n++) {
+           int escapes;
+           char ch;
+
            ptr = words.words[n];
-           if (!*ptr)
+           if (ptr[0] == '\0')
                continue;
            escapes = 0;
            while ((ch = *ptr++)) {
@@ -224,7 +225,7 @@
                case ')':
                    escapes |= FOR_SUB_ESCAPE_PAREN;
                    break;
-               case /*{*/ '}':
+               case '}':
                    escapes |= FOR_SUB_ESCAPE_BRACE;
                    break;
                }
@@ -236,8 +237,12 @@
            strlist_add_str(&new_for->items, bmake_strdup(words.words[n]),
                            escapes);
        }
+    }
 
-       Words_Free(words);
+    Words_Free(words);
+
+    {
+        size_t len, n;
 
        if ((len = strlist_num(&new_for->items)) > 0 &&
            len % (n = strlist_num(&new_for->vars))) {