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-rw-r--r--src/expand.c38
1 files changed, 26 insertions, 12 deletions
diff --git a/src/expand.c b/src/expand.c
index ce9f982..0f747b3 100644
--- a/src/expand.c
+++ b/src/expand.c
@@ -119,7 +119,7 @@ STATIC const char *subevalvar(char *, char *, int, int, int, int, int);
 STATIC char *evalvar(char *, int);
 STATIC size_t strtodest(const char *, const char *, int);
 STATIC void memtodest(const char *, size_t, const char *, int);
-STATIC ssize_t varvalue(char *, int, int, int *);
+STATIC ssize_t varvalue(char *, int, int, int);
 STATIC void expandmeta(struct strlist *, int);
 #ifdef HAVE_GLOB
 STATIC void addglob(const glob_t *);
@@ -712,7 +712,6 @@ evalvar(char *p, int flag)
 	int c;
 	int startloc;
 	ssize_t varlen;
-	int easy;
 	int quoted;
 
 	varflags = *p++;
@@ -723,12 +722,11 @@ evalvar(char *p, int flag)
 
 	quoted = flag & EXP_QUOTED;
 	var = p;
-	easy = (!quoted || (*var == '@' && shellparam.nparam));
 	startloc = expdest - (char *)stackblock();
 	p = strchr(p, '=') + 1;
 
 again:
-	varlen = varvalue(var, varflags, flag, &quoted);
+	varlen = varvalue(var, varflags, flag, quoted);
 	if (varflags & VSNUL)
 		varlen--;
 
@@ -771,8 +769,11 @@ vsplus:
 
 	if (subtype == VSNORMAL) {
 record:
-		if (!easy)
-			goto end;
+		if (quoted) {
+			quoted = *var == '@' && shellparam.nparam;
+			if (!quoted)
+				goto end;
+		}
 		recordregion(startloc, expdest - (char *)stackblock(), quoted);
 		goto end;
 	}
@@ -878,7 +879,7 @@ strtodest(p, syntax, quotes)
  */
 
 STATIC ssize_t
-varvalue(char *name, int varflags, int flags, int *quotedp)
+varvalue(char *name, int varflags, int flags, int quoted)
 {
 	int num;
 	char *p;
@@ -887,11 +888,11 @@ varvalue(char *name, int varflags, int flags, int *quotedp)
 	char sepc;
 	char **ap;
 	char const *syntax;
-	int quoted = *quotedp;
 	int subtype = varflags & VSTYPE;
 	int discard = subtype == VSPLUS || subtype == VSLENGTH;
 	int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL;
 	ssize_t len = 0;
+	char c;
 
 	sep = (flags & EXP_FULL) << CHAR_BIT;
 	syntax = quoted ? DQSYNTAX : BASESYNTAX;
@@ -928,12 +929,25 @@ numvar:
 			goto param;
 		/* fall through */
 	case '*':
-		if (quoted)
-			sep = 0;
-		sep |= ifsset() ? ifsval()[0] : ' ';
+		/* We will set c to 0 or ~0 depending on whether
+		 * we're doing field splitting.  We won't do field
+		 * splitting if either we're quoted or sep is zero.
+		 *
+		 * Instead of testing (quoted || !sep) the following
+		 * trick optimises away any branches by using the
+		 * fact that EXP_QUOTED (which is the only bit that
+		 * can be set in quoted) is the same as EXP_FULL <<
+		 * CHAR_BIT (which is the only bit that can be set
+		 * in sep).
+		 */
+#if EXP_QUOTED >> CHAR_BIT != EXP_FULL
+#error The following two lines expect EXP_QUOTED == EXP_FULL << CHAR_BIT
+#endif
+		c = !((quoted | ~sep) & EXP_QUOTED) - 1;
+		sep &= ~quoted;
+		sep |= ifsset() ? (unsigned char)(c & ifsval()[0]) : ' ';
 param:
 		sepc = sep;
-		*quotedp = !sepc;
 		if (!(ap = shellparam.p))
 			return -1;
 		while ((p = *ap++)) {