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-rw-r--r--lib/c-strcaseeq.h181
1 files changed, 181 insertions, 0 deletions
diff --git a/lib/c-strcaseeq.h b/lib/c-strcaseeq.h
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+/* Optimized case-insensitive string comparison in C locale.
+ Copyright (C) 2001-2002, 2007, 2009-2023 Free Software Foundation, Inc.
+
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ This file 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 Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://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 __clang__) && defined __OPTIMIZE__
+
+/* Case insensitive comparison of ASCII characters. */
+# if C_CTYPE_ASCII
+# define CASEEQ(other,upper) \
+ (c_isupper (upper) ? ((other) & ~0x20) == (upper) : (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