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[src/trunk]: src/usr.bin/make make(1): trust that Var_Subst never returns NULL



details:   https://anonhg.NetBSD.org/src/rev/da0fe987f702
branches:  trunk
changeset: 937965:da0fe987f702
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Aug 29 13:16:54 2020 +0000

description:
make(1): trust that Var_Subst never returns NULL

It really never does, and it doesn't even report errors.  It just
returns the content of the buffer, up to the first parse error.

diffstat:

 usr.bin/make/main.c |  19 +++++++------------
 usr.bin/make/make.c |   8 ++++----
 usr.bin/make/meta.c |  16 ++++++----------
 usr.bin/make/suff.c |   9 +++++----
 usr.bin/make/var.c  |  23 ++++++++++-------------
 5 files changed, 32 insertions(+), 43 deletions(-)

diffs (247 lines):

diff -r 309512058779 -r da0fe987f702 usr.bin/make/main.c
--- a/usr.bin/make/main.c       Sat Aug 29 13:04:30 2020 +0000
+++ b/usr.bin/make/main.c       Sat Aug 29 13:16:54 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: main.c,v 1.328 2020/08/29 13:04:30 rillig Exp $        */
+/*     $NetBSD: main.c,v 1.329 2020/08/29 13:16:54 rillig Exp $        */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -69,7 +69,7 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: main.c,v 1.328 2020/08/29 13:04:30 rillig Exp $";
+static char rcsid[] = "$NetBSD: main.c,v 1.329 2020/08/29 13:16:54 rillig Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
@@ -81,7 +81,7 @@
 #if 0
 static char sccsid[] = "@(#)main.c     8.3 (Berkeley) 3/19/94";
 #else
-__RCSID("$NetBSD: main.c,v 1.328 2020/08/29 13:04:30 rillig Exp $");
+__RCSID("$NetBSD: main.c,v 1.329 2020/08/29 13:16:54 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -1349,13 +1349,11 @@
                        Fatal("%s: cannot open %s.", progname,
                            (char *)Lst_Datum(ln));
        } else {
-           p1 = Var_Subst("${" MAKEFILE_PREFERENCE "}",
-               VAR_CMD, VARE_WANTRES);
-           if (p1) {
+               p1 = Var_Subst("${" MAKEFILE_PREFERENCE "}",
+                              VAR_CMD, VARE_WANTRES);
                (void)str2Lst_Append(makefiles, p1, NULL);
                (void)Lst_Find(makefiles, ReadMakefileSucceeded, NULL);
                free(p1);
-           }
        }
 
        /* In particular suppress .depend for '-r -V .OBJDIR -f /dev/null' */
@@ -2044,11 +2042,8 @@
     }
     expr = "${MAKE_PRINT_VAR_ON_ERROR:@v@$v='${$v}'\n@}";
     cp = Var_Subst(expr, VAR_GLOBAL, VARE_WANTRES);
-    if (cp) {
-       if (*cp)
-           printf("%s", cp);
-       free(cp);
-    }
+    printf("%s", cp);
+    free(cp);
     fflush(stdout);
 
     /*
diff -r 309512058779 -r da0fe987f702 usr.bin/make/make.c
--- a/usr.bin/make/make.c       Sat Aug 29 13:04:30 2020 +0000
+++ b/usr.bin/make/make.c       Sat Aug 29 13:16:54 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: make.c,v 1.129 2020/08/28 04:48:57 rillig Exp $        */
+/*     $NetBSD: make.c,v 1.130 2020/08/29 13:16:54 rillig Exp $        */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -69,14 +69,14 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: make.c,v 1.129 2020/08/28 04:48:57 rillig Exp $";
+static char rcsid[] = "$NetBSD: make.c,v 1.130 2020/08/29 13:16:54 rillig Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
 #if 0
 static char sccsid[] = "@(#)make.c     8.1 (Berkeley) 6/6/93";
 #else
-__RCSID("$NetBSD: make.c,v 1.129 2020/08/28 04:48:57 rillig Exp $");
+__RCSID("$NetBSD: make.c,v 1.130 2020/08/29 13:16:54 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -500,7 +500,7 @@
            free(gn->name);
        }
        gn->name = Var_Subst(gn->uname, pgn, VARE_WANTRES);
-       if (gn->name && gn->uname && strcmp(gn->name, gn->uname) != 0) {
+       if (gn->uname && strcmp(gn->name, gn->uname) != 0) {
            /* See if we have a target for this node. */
            GNode *tgn = Targ_FindNode(gn->name, TARG_NOCREATE);
            if (tgn != NULL)
diff -r 309512058779 -r da0fe987f702 usr.bin/make/meta.c
--- a/usr.bin/make/meta.c       Sat Aug 29 13:04:30 2020 +0000
+++ b/usr.bin/make/meta.c       Sat Aug 29 13:16:54 2020 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: meta.c,v 1.110 2020/08/29 10:41:12 rillig Exp $ */
+/*      $NetBSD: meta.c,v 1.111 2020/08/29 13:16:54 rillig Exp $ */
 
 /*
  * Implement 'meta' mode.
@@ -368,13 +368,13 @@
 {
     meta_file_t *mfp = mfpp;
     char *cmd = cmdp;
-    char *cp = NULL;
+    char *cmd_freeIt = NULL;
 
     if (strchr(cmd, '$')) {
-       cmd = cp = Var_Subst(cmd, mfp->gn, VARE_WANTRES);
+       cmd = cmd_freeIt = Var_Subst(cmd, mfp->gn, VARE_WANTRES);
     }
     fprintf(mfp->fp, "CMD %s\n", cmd);
-    free(cp);
+    free(cmd_freeIt);
     return 0;
 }
 
@@ -628,9 +628,7 @@
     metaBailiwick = Lst_Init();
     metaBailiwickStr = Var_Subst("${.MAKE.META.BAILIWICK:O:u:tA}",
        VAR_GLOBAL, VARE_WANTRES);
-    if (metaBailiwickStr) {
-       str2Lst_Append(metaBailiwick, metaBailiwickStr, NULL);
-    }
+    str2Lst_Append(metaBailiwick, metaBailiwickStr, NULL);
     /*
      * We ignore any paths that start with ${.MAKE.META.IGNORE_PATHS}
      */
@@ -639,9 +637,7 @@
               "/dev /etc /proc /tmp /var/run /var/tmp ${TMPDIR}", VAR_GLOBAL);
     metaIgnorePathsStr = Var_Subst("${" MAKE_META_IGNORE_PATHS ":O:u:tA}",
                                   VAR_GLOBAL, VARE_WANTRES);
-    if (metaIgnorePathsStr) {
-       str2Lst_Append(metaIgnorePaths, metaIgnorePathsStr, NULL);
-    }
+    str2Lst_Append(metaIgnorePaths, metaIgnorePathsStr, NULL);
 
     /*
      * We ignore any paths that match ${.MAKE.META.IGNORE_PATTERNS}
diff -r 309512058779 -r da0fe987f702 usr.bin/make/suff.c
--- a/usr.bin/make/suff.c       Sat Aug 29 13:04:30 2020 +0000
+++ b/usr.bin/make/suff.c       Sat Aug 29 13:16:54 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: suff.c,v 1.134 2020/08/29 12:01:46 rillig Exp $        */
+/*     $NetBSD: suff.c,v 1.135 2020/08/29 13:16:54 rillig Exp $        */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -69,14 +69,14 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: suff.c,v 1.134 2020/08/29 12:01:46 rillig Exp $";
+static char rcsid[] = "$NetBSD: suff.c,v 1.135 2020/08/29 13:16:54 rillig Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
 #if 0
 static char sccsid[] = "@(#)suff.c     8.4 (Berkeley) 3/21/94";
 #else
-__RCSID("$NetBSD: suff.c,v 1.134 2020/08/29 12:01:46 rillig Exp $");
+__RCSID("$NetBSD: suff.c,v 1.135 2020/08/29 13:16:54 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -1281,7 +1281,7 @@
     }
     cp = Var_Subst(cgn->name, pgn, VARE_UNDEFERR|VARE_WANTRES);
 
-    if (cp != NULL) {
+    {
        Lst         members = Lst_Init();
 
        if (cgn->type & OP_ARCHV) {
@@ -1384,6 +1384,7 @@
         */
        free(cp);
     }
+
     if (DEBUG(SUFF)) {
        fprintf(debug_file, "\n");
     }
diff -r 309512058779 -r da0fe987f702 usr.bin/make/var.c
--- a/usr.bin/make/var.c        Sat Aug 29 13:04:30 2020 +0000
+++ b/usr.bin/make/var.c        Sat Aug 29 13:16:54 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.476 2020/08/29 12:48:17 rillig Exp $ */
+/*     $NetBSD: var.c,v 1.477 2020/08/29 13:16:54 rillig Exp $ */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -69,14 +69,14 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: var.c,v 1.476 2020/08/29 12:48:17 rillig Exp $";
+static char rcsid[] = "$NetBSD: var.c,v 1.477 2020/08/29 13:16:54 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 1.476 2020/08/29 12:48:17 rillig Exp $");
+__RCSID("$NetBSD: var.c,v 1.477 2020/08/29 13:16:54 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -721,7 +721,7 @@
                                               VAR_GLOBAL, VARE_WANTRES);
     }
 
-    if (TRUE) {
+    {
        Var *v;
        char **av;
        char *as;
@@ -1464,14 +1464,12 @@
 
     VAR_DEBUG("ModifyWord_Loop: in \"%s\", replace \"%s\" with \"%s\" "
              "to \"%s\"\n",
-             word, args->tvar, args->str, s ? s : "(null)");
-
-    if (s != NULL && s[0] != '\0') {
-       if (s[0] == '\n' || (buf->buf.count > 0 &&
-                            buf->buf.buffer[buf->buf.count - 1] == '\n'))
-           buf->needSep = FALSE;
-       SepBuf_AddStr(buf, s);
-    }
+             word, args->tvar, args->str, s);
+
+    if (s[0] == '\n' || (buf->buf.count > 0 &&
+                        buf->buf.buffer[buf->buf.count - 1] == '\n'))
+       buf->needSep = FALSE;
+    SepBuf_AddStr(buf, s);
     free(s);
 }
 
@@ -3615,7 +3613,6 @@
     if (strchr(nstr, '$') != NULL && (eflags & VARE_WANTRES) != 0) {
        nstr = Var_Subst(nstr, ctxt, eflags);
        *freePtr = nstr;
-       assert(nstr != NULL);
     }
 
     v->flags &= ~(unsigned)VAR_IN_USE;



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