Imported Upstream version 1.5

[debian/gzip] / lib / c-strcaseeq.h

diff --git a/lib/c-strcaseeq.h b/lib/c-strcaseeq.h
new file mode 100644 (file)
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--- /dev/null
+++ b/lib/c-strcaseeq.h
@@ -0,0 +1,184 @@
+/* Optimized case-insensitive string comparison in C locale.
+   Copyright (C) 2001-2002, 2007, 2009-2012 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>.  */
+
+#include "c-strcase.h"
+#include "c-ctype.h"
+
+/* STRCASEEQ allows to optimize string comparison with a small literal string.
+     STRCASEEQ (s, "UTF-8", 'U','T','F','-','8',0,0,0,0)
+   is semantically equivalent to
+     c_strcasecmp (s, "UTF-8") == 0
+   just faster.  */
+
+/* Help GCC to generate good code for string comparisons with
+   immediate strings. */
+#if defined (__GNUC__) && defined (__OPTIMIZE__)
+
+/* Case insensitive comparison of ASCII characters.  */
+# if C_CTYPE_ASCII
+#  define CASEEQ(other,upper) \
+     (c_isupper (upper) ? ((other) & ~0x20) == (upper) : (other) == (upper))
+# elif C_CTYPE_CONSECUTIVE_UPPERCASE && C_CTYPE_CONSECUTIVE_LOWERCASE
+#  define CASEEQ(other,upper) \
+     (c_isupper (upper) ? (other) == (upper) || (other) == (upper) - 'A' + 'a' : (other) == (upper))
+# else
+#  define CASEEQ(other,upper) \
+     (c_toupper (other) == (upper))
+# endif
+
+static inline int
+strcaseeq9 (const char *s1, const char *s2)
+{
+  return c_strcasecmp (s1 + 9, s2 + 9) == 0;
+}
+
+static inline int
+strcaseeq8 (const char *s1, const char *s2, char s28)
+{
+  if (CASEEQ (s1[8], s28))
+    {
+      if (s28 == 0)
+        return 1;
+      else
+        return strcaseeq9 (s1, s2);
+    }
+  else
+    return 0;
+}
+
+static inline int
+strcaseeq7 (const char *s1, const char *s2, char s27, char s28)
+{
+  if (CASEEQ (s1[7], s27))
+    {
+      if (s27 == 0)
+        return 1;
+      else
+        return strcaseeq8 (s1, s2, s28);
+    }
+  else
+    return 0;
+}
+
+static inline int
+strcaseeq6 (const char *s1, const char *s2, char s26, char s27, char s28)
+{
+  if (CASEEQ (s1[6], s26))
+    {
+      if (s26 == 0)
+        return 1;
+      else
+        return strcaseeq7 (s1, s2, s27, s28);
+    }
+  else
+    return 0;
+}
+
+static inline int
+strcaseeq5 (const char *s1, const char *s2, char s25, char s26, char s27, char s28)
+{
+  if (CASEEQ (s1[5], s25))
+    {
+      if (s25 == 0)
+        return 1;
+      else
+        return strcaseeq6 (s1, s2, s26, s27, s28);
+    }
+  else
+    return 0;
+}
+
+static inline int
+strcaseeq4 (const char *s1, const char *s2, char s24, char s25, char s26, char s27, char s28)
+{
+  if (CASEEQ (s1[4], s24))
+    {
+      if (s24 == 0)
+        return 1;
+      else
+        return strcaseeq5 (s1, s2, s25, s26, s27, s28);
+    }
+  else
+    return 0;
+}
+
+static inline int
+strcaseeq3 (const char *s1, const char *s2, char s23, char s24, char s25, char s26, char s27, char s28)
+{
+  if (CASEEQ (s1[3], s23))
+    {
+      if (s23 == 0)
+        return 1;
+      else
+        return strcaseeq4 (s1, s2, s24, s25, s26, s27, s28);
+    }
+  else
+    return 0;
+}
+
+static inline int
+strcaseeq2 (const char *s1, const char *s2, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
+{
+  if (CASEEQ (s1[2], s22))
+    {
+      if (s22 == 0)
+        return 1;
+      else
+        return strcaseeq3 (s1, s2, s23, s24, s25, s26, s27, s28);
+    }
+  else
+    return 0;
+}
+
+static inline int
+strcaseeq1 (const char *s1, const char *s2, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
+{
+  if (CASEEQ (s1[1], s21))
+    {
+      if (s21 == 0)
+        return 1;
+      else
+        return strcaseeq2 (s1, s2, s22, s23, s24, s25, s26, s27, s28);
+    }
+  else
+    return 0;
+}
+
+static inline int
+strcaseeq0 (const char *s1, const char *s2, char s20, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
+{
+  if (CASEEQ (s1[0], s20))
+    {
+      if (s20 == 0)
+        return 1;
+      else
+        return strcaseeq1 (s1, s2, s21, s22, s23, s24, s25, s26, s27, s28);
+    }
+  else
+    return 0;
+}
+
+#define STRCASEEQ(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \
+  strcaseeq0 (s1, s2, s20, s21, s22, s23, s24, s25, s26, s27, s28)
+
+#else
+
+#define STRCASEEQ(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \
+  (c_strcasecmp (s1, s2) == 0)
+
+#endif