[src/trunk]: src/usr.bin/make make(1): split local variable in Cmd_Exec into two

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

details:   https://anonhg.NetBSD.org/src/rev/73f95909f786
branches:  trunk
changeset: 936939:73f95909f786
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sun Aug 09 09:01:29 2020 +0000

description:
make(1): split local variable in Cmd_Exec into two

This avoids a mismatch between signed and unsigned types.

diffstat:

 usr.bin/make/main.c |  34 ++++++++++++++++------------------
 1 files changed, 16 insertions(+), 18 deletions(-)

diffs (89 lines):

diff -r 6e2950852d60 -r 73f95909f786 usr.bin/make/main.c
--- a/usr.bin/make/main.c       Sun Aug 09 08:49:00 2020 +0000
+++ b/usr.bin/make/main.c       Sun Aug 09 09:01:29 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: main.c,v 1.297 2020/08/08 18:54:04 rillig Exp $        */
+/*     $NetBSD: main.c,v 1.298 2020/08/09 09:01:29 rillig Exp $        */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -69,7 +69,7 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: main.c,v 1.297 2020/08/08 18:54:04 rillig Exp $";
+static char rcsid[] = "$NetBSD: main.c,v 1.298 2020/08/09 09:01:29 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 1.297 2020/08/08 18:54:04 rillig Exp $");
+__RCSID("$NetBSD: main.c,v 1.298 2020/08/09 09:01:29 rillig Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -1599,12 +1599,13 @@
     int        fds[2];         /* Pipe streams */
     int        cpid;           /* Child PID */
     int        pid;            /* PID from wait() */
-    char       *res;           /* result */
     int                status;         /* command exit status */
     Buffer     buf;            /* buffer to store the result */
+    ssize_t    bytes_read;
+    char       *res;           /* result */
+    size_t     res_len;
     char       *cp;
     int                savederr;       /* saved errno */
-    ssize_t    cc;             /* bytes read, or -1 */
 
     *errfmt = NULL;
 
@@ -1666,12 +1667,12 @@
        /* XXX: split variable cc into 2 */
        do {
            char   result[BUFSIZ];
-           cc = read(fds[0], result, sizeof(result));
-           if (cc > 0)
-               Buf_AddBytes(&buf, result, (size_t)cc);
+           bytes_read = read(fds[0], result, sizeof(result));
+           if (bytes_read > 0)
+               Buf_AddBytes(&buf, result, (size_t)bytes_read);
        }
-       while (cc > 0 || (cc == -1 && errno == EINTR));
-       if (cc == -1)
+       while (bytes_read > 0 || (bytes_read == -1 && errno == EINTR));
+       if (bytes_read == -1)
            savederr = errno;
 
        /*
@@ -1686,7 +1687,7 @@
            JobReapChild(pid, status, FALSE);
            continue;
        }
-       cc = (/* XXX */ssize_t)Buf_Size(&buf);
+       res_len = Buf_Size(&buf);
        res = Buf_Destroy(&buf, FALSE);
 
        if (savederr != 0)
@@ -1697,14 +1698,11 @@
        else if (WEXITSTATUS(status) != 0)
            *errfmt = "\"%s\" returned non-zero status";
 
-       /*
-        * Null-terminate the result, convert newlines to spaces and
-        * install it in the variable.
-        */
-       res[cc] = '\0';
-       cp = &res[cc];
+       /* Null-terminate the result and convert newlines to spaces. */
+       res[res_len] = '\0';
+       cp = &res[res_len];
 
-       if (cc > 0 && *--cp == '\n') {
+       if (res_len > 0 && *--cp == '\n') {
            /*
             * A final newline is just stripped
             */