*: use better isspace implementation

[oweals/busybox.git] / include / libbb.h

diff --git a/include/libbb.h b/include/libbb.h
index 6e629d187e2e4d653b4eb47fbca18d8135b72794..fb7296f25fe0f79489cbb4853274cc59122f8318 100644 (file)
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1271,6 +1271,7 @@ line_input_t *new_line_input_t(int flags) FAST_FUNC;
  */
 int read_line_input(const char* prompt, char* command, int maxsize, line_input_t *state) FAST_FUNC;
 #else
+#define MAX_HISTORY 0
 int read_line_input(const char* prompt, char* command, int maxsize) FAST_FUNC;
 #define read_line_input(prompt, command, maxsize, state) \
        read_line_input(prompt, command, maxsize)
@@ -1575,7 +1576,6 @@ extern const char bb_default_login_shell[];
 #undef islower
 #undef isprint
 #undef ispunct
-#undef isspace
 #undef isupper
 #undef isxdigit
 
@@ -1583,6 +1583,16 @@ extern const char bb_default_login_shell[];
 #undef isdigit
 #define isdigit(a) ((unsigned)((a) - '0') <= 9)
 
+/* This one is more efficient too! ~200 bytes */
+/* In POSIX/C locale (the only locale we care about: do we REALLY want
+ * to allow Unicode whitespace in, say, .conf files? nuts!)
+ * isspace is only these chars: "\t\n\v\f\r" and space.
+ * "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
+ * Use that.
+ */
+#undef isspace
+#define isspace(a) ({ unsigned char bb__isspace = (a) - 9; bb__isspace == (' ' - 9) || bb__isspace <= (13 - 9); })
+
 #define ARRAY_SIZE(x) ((unsigned)(sizeof(x) / sizeof((x)[0])))