[src/trunk]: src/usr.bin/make make(1): extract SubstVarLong from ForIterate

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

details:   https://anonhg.NetBSD.org/src/rev/bed98399fd33
branches:  trunk
changeset: 977496:bed98399fd33
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Oct 25 13:45:33 2020 +0000

description:
make(1): extract SubstVarLong from ForIterate

diffstat:

 usr.bin/make/for.c |  55 ++++++++++++++++++++++++++++++++++++-----------------
 1 files changed, 37 insertions(+), 18 deletions(-)

diffs (87 lines):

diff -r 9d884ba2f715 -r bed98399fd33 usr.bin/make/for.c
--- a/usr.bin/make/for.c        Sun Oct 25 13:31:16 2020 +0000
+++ b/usr.bin/make/for.c        Sun Oct 25 13:45:33 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: for.c,v 1.96 2020/10/25 13:20:11 rillig Exp $  */
+/*     $NetBSD: for.c,v 1.97 2020/10/25 13:45:33 rillig Exp $  */
 
 /*
  * Copyright (c) 1992, The Regents of the University of California.
@@ -60,7 +60,7 @@
 #include    "make.h"
 
 /*     "@(#)for.c      8.1 (Berkeley) 6/6/93"  */
-MAKE_RCSID("$NetBSD: for.c,v 1.96 2020/10/25 13:20:11 rillig Exp $");
+MAKE_RCSID("$NetBSD: for.c,v 1.97 2020/10/25 13:45:33 rillig Exp $");
 
 typedef enum ForEscapes {
     FOR_SUB_ESCAPE_CHAR = 0x0001,
@@ -389,6 +389,39 @@
     }
 }
 
+static void
+SubstVarLong(For *arg, const char **inout_cp, const char **inout_cmd_cp,
+            Buffer *cmds, char ech)
+{
+    size_t i;
+    const char *cp = *inout_cp;
+    const char *cmd_cp = *inout_cmd_cp;
+
+    for (i = 0; i < arg->vars.len; i++) {
+       ForVar *forVar = Vector_Get(&arg->vars, i);
+       char *var = forVar->name;
+       size_t vlen = forVar->len;
+
+       /* XXX: undefined behavior for cp if vlen is longer than cp? */
+       if (memcmp(cp, var, vlen) != 0)
+           continue;
+       /* XXX: why test for backslash here? */
+       if (cp[vlen] != ':' && cp[vlen] != ech && cp[vlen] != '\\')
+           continue;
+
+       /* Found a variable match. Replace with :U<value> */
+       Buf_AddBytesBetween(cmds, cmd_cp, cp);
+       Buf_AddStr(cmds, ":U");
+       cp += vlen;
+       cmd_cp = cp;
+       for_substitute(cmds, Vector_Get(&arg->items, arg->sub_next + i), ech);
+       break;
+    }
+
+    *inout_cp = cp;
+    *inout_cmd_cp = cmd_cp;
+}
+
 /*
  * Scan the for loop body and replace references to the loop variables
  * with variable references that expand to the required text.
@@ -431,26 +464,12 @@
        if ((ch == '(' && (ech = ')', 1)) || (ch == '{' && (ech = '}', 1))) {
            cp++;
            /* Check variable name against the .for loop variables */
-           for (i = 0; i < arg->vars.len; i++) {
-               ForVar *forVar = Vector_Get(&arg->vars, i);
-               char *var = forVar->name;
-               size_t vlen = forVar->len;
-               if (memcmp(cp, var, vlen) != 0)
-                   continue;
-               if (cp[vlen] != ':' && cp[vlen] != ech && cp[vlen] != '\\')
-                   continue;
-               /* Found a variable match. Replace with :U<value> */
-               Buf_AddBytesBetween(&cmds, cmd_cp, cp);
-               Buf_AddStr(&cmds, ":U");
-               cp += vlen;
-               cmd_cp = cp;
-               for_substitute(&cmds, Vector_Get(&arg->items, arg->sub_next + i), ech);
-               break;
-           }
+           SubstVarLong(arg, &cp, &cmd_cp, &cmds, ech);
            continue;
        }
        if (ch == '\0')
            break;
+
        /* Probably a single character name, ignore $$ and stupid ones. {*/
        if (!arg->short_var || strchr("}):$", ch) != NULL) {
            cp++;