in nstrcasestr(), mbstrcasestr(), revstrstr(), revstrcasestr(), and

mbrevstrcasestr(), for efficiency, return haystack immediately if needle
is blank


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4122 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

+2007-07-02  David Lawrence Ramsey  <pooka109@gmail.com>
+
+	* chars.c (nstrcasestr, mbstrcasestr, revstrstr, revstrcasestr,
+	mbrevstrcasestr): For efficiency, return haystack immediately if
+	needle is blank.
+
 2007-07-01  David Lawrence Ramsey  <pooka109@gmail.com>
 
 	* chars.c (nstrncasecmp, mbstrncasecmp): For efficiency, return

src/chars.c

@@ -606,6 +606,9 @@ const char *nstrcasestr(const char *haystack, const char *needle)
 {
     assert(haystack != NULL && needle != NULL);
 
+    if (needle == '\0')
+	return haystack;
+
     for (; *haystack != '\0'; haystack++) {
 	const char *r = haystack, *q = needle;
 
@@ -631,6 +634,9 @@ const char *mbstrcasestr(const char *haystack, const char *needle)
 
 	assert(haystack != NULL && needle != NULL);
 
+	if (needle == '\0')
+	    return haystack;
+
 	r_mb = charalloc(MB_CUR_MAX);
 	q_mb = charalloc(MB_CUR_MAX);
 
@@ -690,6 +696,9 @@ const char *revstrstr(const char *haystack, const char *needle, const
 {
     assert(haystack != NULL && needle != NULL && rev_start != NULL);
 
+    if (needle == '\0')
+	return rev_start;
+
     for (; rev_start >= haystack; rev_start--) {
 	const char *r, *q;
 
@@ -712,6 +721,9 @@ const char *revstrcasestr(const char *haystack, const char *needle,
 {
     assert(haystack != NULL && needle != NULL && rev_start != NULL);
 
+    if (needle == '\0')
+	return rev_start;
+
     for (; rev_start >= haystack; rev_start--) {
 	const char *r = rev_start, *q = needle;
 
@@ -739,6 +751,9 @@ const char *mbrevstrcasestr(const char *haystack, const char *needle,
 
 	assert(haystack != NULL && needle != NULL && rev_start != NULL);
 
+	if (needle == '\0')
+	    return rev_start;
+
 	r_mb = charalloc(MB_CUR_MAX);
 	q_mb = charalloc(MB_CUR_MAX);