test-ctype: macrofy

Rewrite test-ctype to use a global variable and a macro instead of
wrapper functions for each character class and complicated structs
with loops going through them.  The resulting code may be uglier,
but that's OK for a test program, and it's actually easier to read
and extend.  And much shorter.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

test-ctype.c

@@ -1,78 +1,41 @@
 #include "cache.h"
 
+static int rc;
 
-static int test_isdigit(int c)
+static void report_error(const char *class, int ch)
 {
-	return isdigit(c);
+	printf("%s classifies char %d (0x%02x) wrongly\n", class, ch, ch);
+	rc = 1;
 }
 
-static int test_isspace(int c)
+static int is_in(const char *s, int ch)
 {
-	return isspace(c);
+	/* We can't find NUL using strchr.  It's classless anyway. */
+	if (ch == '\0')
+		return 0;
+	return !!strchr(s, ch);
 }
 
-static int test_isalpha(int c)
-{
-	return isalpha(c);
-}
-
-static int test_isalnum(int c)
-{
-	return isalnum(c);
-}
-
-static int test_is_glob_special(int c)
-{
-	return is_glob_special(c);
-}
-
-static int test_is_regex_special(int c)
-{
-	return is_regex_special(c);
+#define TEST_CLASS(t,s) {			\
+	int i;					\
+	for (i = 0; i < 256; i++) {		\
+		if (is_in(s, i) != t(i))	\
+			report_error(#t, i);	\
+	}					\
 }
 
 #define DIGIT "0123456789"
 #define LOWER "abcdefghijklmnopqrstuvwxyz"
 #define UPPER "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 
-static const struct ctype_class {
-	const char *name;
-	int (*test_fn)(int);
-	const char *members;
-} classes[] = {
-	{ "isdigit", test_isdigit, DIGIT },
-	{ "isspace", test_isspace, " \n\r\t" },
-	{ "isalpha", test_isalpha, LOWER UPPER },
-	{ "isalnum", test_isalnum, LOWER UPPER DIGIT },
-	{ "is_glob_special", test_is_glob_special, "*?[\\" },
-	{ "is_regex_special", test_is_regex_special, "$()*+.?[\\^{|" },
-	{ NULL }
-};
-
-static int test_class(const struct ctype_class *test)
-{
-	int i, rc = 0;
-
-	for (i = 0; i < 256; i++) {
-		int expected = i ? !!strchr(test->members, i) : 0;
-		int actual = test->test_fn(i);
-
-		if (actual != expected) {
-			rc = 1;
-			printf("%s classifies char %d (0x%02x) wrongly\n",
-			       test->name, i, i);
-		}
-	}
-	return rc;
-}
-
 int main(int argc, char **argv)
 {
-	const struct ctype_class *test;
-	int rc = 0;
-
-	for (test = classes; test->name; test++)
-		rc |= test_class(test);
+	TEST_CLASS(isdigit, DIGIT);
+	TEST_CLASS(isspace, " \n\r\t");
+	TEST_CLASS(isalpha, LOWER UPPER);
+	TEST_CLASS(isalnum, LOWER UPPER DIGIT);
+	TEST_CLASS(is_glob_special, "*?[\\");
+	TEST_CLASS(is_regex_special, "$()*+.?[\\^{|");
 
 	return rc;
 }