updated for version 7.3.1175
Problem: Using isalpha() and isalnum() can be slow.
Solution: Use range checks. (Mike Williams)
diff --git a/src/macros.h b/src/macros.h
index 2c305ce..f4a068c 100644
--- a/src/macros.h
+++ b/src/macros.h
@@ -99,6 +99,11 @@
# define MB_TOUPPER(c) TOUPPER_LOC(c)
#endif
+/* Use our own isdigit() replacement, because on MS-Windows isdigit() returns
+ * non-zero for superscript 1. Also avoids that isdigit() crashes for numbers
+ * below 0 and above 255. */
+#define VIM_ISDIGIT(c) ((unsigned)(c) - '0' < 10)
+
/* Like isalpha() but reject non-ASCII characters. Can't be used with a
* special key (negative value). */
#ifdef EBCDIC
@@ -107,17 +112,12 @@
# define ASCII_ISLOWER(c) islower(c)
# define ASCII_ISUPPER(c) isupper(c)
#else
-# define ASCII_ISALPHA(c) ((c) < 0x7f && isalpha(c))
-# define ASCII_ISALNUM(c) ((c) < 0x7f && isalnum(c))
# define ASCII_ISLOWER(c) ((unsigned)(c) - 'a' < 26)
# define ASCII_ISUPPER(c) ((unsigned)(c) - 'A' < 26)
+# define ASCII_ISALPHA(c) (ASCII_ISUPPER(c) || ASCII_ISLOWER(c))
+# define ASCII_ISALNUM(c) (ASCII_ISALPHA(c) || VIM_ISDIGIT(c))
#endif
-/* Use our own isdigit() replacement, because on MS-Windows isdigit() returns
- * non-zero for superscript 1. Also avoids that isdigit() crashes for numbers
- * below 0 and above 255. */
-#define VIM_ISDIGIT(c) ((unsigned)(c) - '0' < 10)
-
/* macro version of chartab().
* Only works with values 0-255!
* Doesn't work for UTF-8 mode with chars >= 0x80. */