From 185ac97303d4c4289462c7b37b498006c4700a70 Mon Sep 17 00:00:00 2001
From: Markus Scherer <markus.icu@gmail.com>
Date: Sat, 1 Jun 2002 00:33:55 +0000
Subject: [PATCH] ICU-1923 add uprv_comparePropertyNames() to compare Unicode
 property [value] names loosely

X-SVN-Rev: 8763
---
 icu4c/source/common/uprops.c | 49 ++++++++++++++++++++++++++++++++++++
 icu4c/source/common/uprops.h | 15 +++++++++++
 2 files changed, 64 insertions(+)

diff --git a/icu4c/source/common/uprops.c b/icu4c/source/common/uprops.c
index 75aa109306f..a552dee82d2 100644
--- a/icu4c/source/common/uprops.c
+++ b/icu4c/source/common/uprops.c
@@ -20,6 +20,7 @@
 #include "unicode/utypes.h"
 #include "unicode/uchar.h"
 #include "unicode/uscript.h"
+#include "cstring.h"
 #include "unormimp.h"
 #include "uprops.h"
 
@@ -61,6 +62,54 @@
 
 #define CGJ     0x34f
 
+/**
+ * Unicode property names and property value names are compared
+ * "loosely". Property[Value]Aliases.txt say:
+ *   "With loose matching of property names, the case distinctions, whitespace,
+ *    and '_' are ignored."
+ *
+ * This function does just that, for ASCII (char *) name strings.
+ * It is almost identical to ucnv_compareNames() but also ignores
+ * ASCII White_Space characters (U+0009..U+000d).
+ *
+ * @internal
+ */
+U_CAPI int32_t U_EXPORT2
+uprv_comparePropertyNames(const char *name1, const char *name2) {
+    int32_t rc;
+    unsigned char c1, c2;
+
+    for(;;) {
+        /* Ignore delimiters '-', '_', and ASCII White_Space */
+        while((c1=(unsigned char)*name1)=='-' || c1=='_' ||
+              c1==' ' || c1=='\t' || c1=='\n' || c1=='\v' || c1=='\f' || c1=='\r'
+        ) {
+            ++name1;
+        }
+        while((c2=(unsigned char)*name2)=='-' || c2=='_' ||
+              c2==' ' || c2=='\t' || c2=='\n' || c2=='\v' || c2=='\f' || c2=='\r'
+        ) {
+            ++name2;
+        }
+
+        /* If we reach the ends of both strings then they match */
+        if((c1|c2)==0) {
+            return 0;
+        }
+        
+        /* Case-insensitive comparison */
+        if(c1!=c2) {
+            rc=(int32_t)(unsigned char)uprv_tolower(c1)-(int32_t)(unsigned char)uprv_tolower(c2);
+            if(rc!=0) {
+                return rc;
+            }
+        }
+
+        ++name1;
+        ++name2;
+    }
+}
+
 /* API functions ------------------------------------------------------------ */
 
 U_CAPI void U_EXPORT2
diff --git a/icu4c/source/common/uprops.h b/icu4c/source/common/uprops.h
index f61a5939442..92bab3fcfc5 100644
--- a/icu4c/source/common/uprops.h
+++ b/icu4c/source/common/uprops.h
@@ -147,4 +147,19 @@ enum UEAWidthCode {
 };
 typedef enum UEAWidthCode UEAWidthCode;
 
+/**
+ * Unicode property names and property value names are compared
+ * "loosely". Property[Value]Aliases.txt say:
+ *   "With loose matching of property names, the case distinctions, whitespace,
+ *    and '_' are ignored."
+ *
+ * This function does just that, for ASCII (char *) name strings.
+ * It is almost identical to ucnv_compareNames() but also ignores
+ * ASCII White_Space characters (U+0009..U+000d).
+ *
+ * @internal
+ */
+U_CAPI int32_t U_EXPORT2
+uprv_comparePropertyNames(const char *name1, const char *name2);
+
 #endif