[PATCH v2 1/5] git-compat-util: add isblank() and isgraph()

[Masahiro Yamada <masahiroy@kernel.org>]

git-compat-util.h implements most of is*() macros.

Add isblank() and isgraph(), which are useful to clean up wildmatch.c
in a consistent way (in this and later commits).

In the previous submission, I just moved isblank() and isgraph() as
implemented in wildmatch.c. I knew they were not robust against the
pointer increment like isblank(*s++), but I thought it was the same
pattern as isprint(), which has the same issue. Unfortunately, it was
more controversial than I had expected...

This version implements them as inline functions because we ran out
all bits in the sane_ctype[] table. This is the same pattern as
islower() and isupper().

Once we refactor ctype.c to create more room in sane_ctype[], isblank()
and isgraph() will be able to use sane_istest(). Probably so will
islower() and isupper(). The ctype in Linux kernel (lib/ctype.c) has
the LOWER and UPPER bits separately.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

Changes in v2:
  - Use inline functions

 git-compat-util.h | 14 ++++++++++++++
 wildmatch.c       | 14 ++------------
 2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/git-compat-util.h b/git-compat-util.h
index 4f0028ce60..b29c238f02 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -1212,10 +1212,12 @@ extern const unsigned char tolower_trans_tbl[256];
 /* Sane ctype - no locale, and works with signed chars */
 #undef isascii
 #undef isspace
+#undef isblank
 #undef isdigit
 #undef isalpha
 #undef isalnum
 #undef isprint
+#undef isgraph
 #undef islower
 #undef isupper
 #undef tolower
@@ -1236,10 +1238,12 @@ extern const unsigned char sane_ctype[256];
 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 #define isascii(x) (((x) & ~0x7f) == 0)
 #define isspace(x) sane_istest(x,GIT_SPACE)
+#define isblank(x) sane_isblank(x)
 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
+#define isgraph(x) sane_isgraph(x)
 #define islower(x) sane_iscase(x, 1)
 #define isupper(x) sane_iscase(x, 0)
 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
@@ -1270,6 +1274,16 @@ static inline int sane_iscase(int x, int is_lower)
 		return (x & 0x20) == 0;
 }
 
+static inline int sane_isblank(int c)
+{
+	return c == ' ' || c == '\t';
+}
+
+static inline int sane_isgraph(int c)
+{
+	return isprint(c) && !isspace(c);
+}
+
 /*
  * Like skip_prefix, but compare case-insensitively. Note that the comparison
  * is done via tolower(), so it is strictly ASCII (no multi-byte characters or
diff --git a/wildmatch.c b/wildmatch.c
index 7e5a7ea1ea..85c4c7f8a7 100644
--- a/wildmatch.c
+++ b/wildmatch.c
@@ -28,18 +28,8 @@ typedef unsigned char uchar;
 # define ISASCII(c) isascii(c)
 #endif
 
-#ifdef isblank
-# define ISBLANK(c) (ISASCII(c) && isblank(c))
-#else
-# define ISBLANK(c) ((c) == ' ' || (c) == '\t')
-#endif
-
-#ifdef isgraph
-# define ISGRAPH(c) (ISASCII(c) && isgraph(c))
-#else
-# define ISGRAPH(c) (ISASCII(c) && isprint(c) && !isspace(c))
-#endif
-
+#define ISBLANK(c) (ISASCII(c) && isblank(c))
+#define ISGRAPH(c) (ISASCII(c) && isgraph(c))
 #define ISPRINT(c) (ISASCII(c) && isprint(c))
 #define ISDIGIT(c) (ISASCII(c) && isdigit(c))
 #define ISALNUM(c) (ISASCII(c) && isalnum(c))
-- 
2.34.1