1 files changed, 114 insertions, 0 deletions
diff --git a/libsm/strcaseeq.c b/libsm/strcaseeq.c
new file mode 100644
index 000000000000..c252d85e53e0
--- /dev/null
+++ b/libsm/strcaseeq.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2020 Proofpoint, Inc. and its suppliers.
+ *	All rights reserved.
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the sendmail distribution.
+ *
+ */
+
+#include <sm/gen.h>
+#include <sm/sendmail.h>
+
+#if USE_EAI
+#include <sm/string.h>
+#include <sm/heap.h>
+#include <sm/ixlen.h>
+
+/*
+**  SM_STRCASEEQ -- are two strings equal (case-insenstive)?
+**
+**	Parameters:
+**		s1 -- string
+**		s2 -- string
+**
+**	Returns:
+**		true iff s1 == s2
+*/
+
+bool
+sm_strcaseeq(s1, s2)
+	const char *s1;
+	const char *s2;
+{
+	char *l1, *l2;
+	char *f1;
+	bool same;
+
+	if (asciistr(s1))
+	{
+		if (!asciistr(s2))
+			return false;
+		return (sm_strcasecmp(s1, s2) == 0);
+	}
+	if (asciistr(s2))
+		return false;
+	l1 = sm_lowercase(s1);
+	if (l1 != s1)
+	{
+		f1 = sm_strdup_x(l1);
+		l1 = f1;
+	}
+	else
+		f1 = NULL;
+	l2 = sm_lowercase(s2);
+
+	while (*l1 == *l2 && '\0' != *l1)
+		l1++, l2++;
+	same = *l1 == *l2;
+
+	SM_FREE(f1);
+	return same;
+}
+
+/*
+**  SM_STRNCASEEQ -- are two strings (up to a length) equal (case-insenstive)?
+**
+**	Parameters:
+**		s1 -- string
+**		s2 -- string
+**		n -- maximum length to compare
+**
+**	Returns:
+**		true iff s1 == s2 (for up to the first n char)
+*/
+
+bool
+sm_strncaseeq(s1, s2, n)
+	const char *s1;
+	const char *s2;
+	size_t n;
+{
+	char *l1, *l2;
+	char *f1;
+	bool same;
+
+	if (0 == n)
+		return true;
+	if (asciistr(s1))
+	{
+		if (!asciistr(s2))
+			return false;
+		return (sm_strncasecmp(s1, s2, n) == 0);
+	}
+	if (asciistr(s2))
+		return false;
+	l1 = sm_lowercase(s1);
+	if (l1 != s1)
+	{
+		f1 = sm_strdup_x(l1);
+		l1 = f1;
+	}
+	else
+		f1 = NULL;
+	l2 = sm_lowercase(s2);
+
+	while (*l1 == *l2 && '\0' != *l1 && n-- > 0)
+		l1++, l2++;
+	same = *l1 == *l2;
+
+	SM_FREE(f1);
+	return same;
+}
+#endif /* USE_EAI */