svn commit: r214190 - in stable/8: . bin/sh contrib/top
etc/periodic/daily gnu/usr.bin lib/libusb
release/picobsd/floppy.tree/sbin sbin/geom/class/sched
tools/regression/bin/sh/expansion tools/regr...
David E. O'Brien
obrien at FreeBSD.org
Thu Oct 21 23:45:58 UTC 2010
Author: obrien
Date: Thu Oct 21 23:45:57 2010
New Revision: 214190
URL: http://svn.freebsd.org/changeset/base/214190
Log:
MFC r213814: Do not assume in growstackstr() that a "precious" character
will be immediately written into the stack after the call. Instead let
the caller manage the "space left".
Added:
stable/8/tools/regression/bin/sh/expansion/trim4.0
- copied unchanged from r213814, head/tools/regression/bin/sh/expansion/trim4.0
Modified:
stable/8/bin/sh/histedit.c
stable/8/bin/sh/memalloc.c
stable/8/bin/sh/memalloc.h
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Modified: stable/8/bin/sh/histedit.c
==============================================================================
--- stable/8/bin/sh/histedit.c Thu Oct 21 23:08:42 2010 (r214189)
+++ stable/8/bin/sh/histedit.c Thu Oct 21 23:45:57 2010 (r214190)
@@ -399,7 +399,7 @@ fc_replace(const char *s, char *p, char
} else
STPUTC(*s++, dest);
}
- STACKSTRNUL(dest);
+ STPUTC('\0', dest);
dest = grabstackstr(dest);
return (dest);
Modified: stable/8/bin/sh/memalloc.c
==============================================================================
--- stable/8/bin/sh/memalloc.c Thu Oct 21 23:08:42 2010 (r214189)
+++ stable/8/bin/sh/memalloc.c Thu Oct 21 23:45:57 2010 (r214190)
@@ -295,6 +295,13 @@ grabstackblock(int len)
* is space for at least one character.
*/
+static char *
+growstrstackblock(int n)
+{
+ growstackblock();
+ sstrnleft = stackblocksize() - n;
+ return stackblock() + n;
+}
char *
growstackstr(void)
@@ -304,12 +311,10 @@ growstackstr(void)
len = stackblocksize();
if (herefd >= 0 && len >= 1024) {
xwrite(herefd, stackblock(), len);
- sstrnleft = len - 1;
+ sstrnleft = len;
return stackblock();
}
- growstackblock();
- sstrnleft = stackblocksize() - len - 1;
- return stackblock() + len;
+ return growstrstackblock(len);
}
@@ -323,9 +328,7 @@ makestrspace(void)
int len;
len = stackblocksize() - sstrnleft;
- growstackblock();
- sstrnleft = stackblocksize() - len;
- return stackblock() + len;
+ return growstrstackblock(len);
}
Modified: stable/8/bin/sh/memalloc.h
==============================================================================
--- stable/8/bin/sh/memalloc.h Thu Oct 21 23:08:42 2010 (r214189)
+++ stable/8/bin/sh/memalloc.h Thu Oct 21 23:45:57 2010 (r214190)
@@ -67,9 +67,16 @@ void ungrabstackstr(char *, char *);
#define stackblock() stacknxt
#define stackblocksize() stacknleft
#define STARTSTACKSTR(p) p = stackblock(), sstrnleft = stackblocksize()
-#define STPUTC(c, p) (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
+#define STPUTC(c, p) (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), --sstrnleft, *p++ = (c)))
#define CHECKSTRSPACE(n, p) { if (sstrnleft < n) p = makestrspace(); }
#define USTPUTC(c, p) (--sstrnleft, *p++ = (c))
+/*
+ * STACKSTRNUL's use is where we want to be able to turn a stack
+ * (non-sentinel, character counting string) into a C string,
+ * and later pretend the NUL is not there.
+ * Note: Because of STACKSTRNUL's semantics, STACKSTRNUL cannot be used
+ * on a stack that will grabstackstr()ed.
+ */
#define STACKSTRNUL(p) (sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
#define STUNPUTC(p) (++sstrnleft, --p)
#define STTOPC(p) p[-1]
Copied: stable/8/tools/regression/bin/sh/expansion/trim4.0 (from r213814, head/tools/regression/bin/sh/expansion/trim4.0)
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ stable/8/tools/regression/bin/sh/expansion/trim4.0 Thu Oct 21 23:45:57 2010 (r214190, copy of r213814, head/tools/regression/bin/sh/expansion/trim4.0)
@@ -0,0 +1,15 @@
+# $FreeBSD$
+
+v1=/homes/SOME_USER
+v2=
+v3=C123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
+
+# Trigger bug in VSTRIMRIGHT processing STADJUST() call in expand.c:subevalvar()
+while [ ${#v2} -lt 2000 ]; do
+ v4="${v2} ${v1%/*} $v3"
+ if [ ${#v4} -ne $((${#v2} + ${#v3} + 8)) ]; then
+ echo bad: ${#v4} -ne $((${#v2} + ${#v3} + 8))
+ fi
+ v2=x$v2
+ v3=y$v3
+done
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