From 98612f549202c491c9b97df54e77d413a8e35e8d Mon Sep 17 00:00:00 2001 From: Přemysl Eric Janouch Date: Fri, 9 Jul 2021 04:36:43 +0200 Subject: Improve C-char parsing I was hoping that a superoptimiser would help me find a miraculous branchless equation to cover it, but in the end the branching doesn't hurt at all in our case. It's more readable than `(((char >> 2) - 0x38) & 0x60) ^ char` or `(char ^ 0x40) & (((char >> 1) ^ 0x20) | 0x5f)`. --- sdn.cpp | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/sdn.cpp b/sdn.cpp index 4636ff3..3565bcb 100644 --- a/sdn.cpp +++ b/sdn.cpp @@ -398,9 +398,9 @@ fun decode_attrs (const vector &attrs) -> chtype { // --- Application ------------------------------------------------------------- -enum { ALT = 1 << 24, SYM = 1 << 25 }; // Outside the range of Unicode +enum { ALT = 1 << 24, SYM = 1 << 25 }; // Outside the range of Unicode #define KEY(name) (SYM | KEY_ ## name) -#define CTRL(char) ((char - 64) & 0x7f) // 60..7f aren't translated correctly +#define CTRL(char) ((char) == '?' ? 0x7f : (char) & 0x1f) #define ACTIONS(XX) XX(NONE) XX(HELP) XX(QUIT) XX(QUIT_NO_CHDIR) \ XX(CHOOSE) XX(CHOOSE_FULL) XX(VIEW) XX(EDIT) XX(SORT_LEFT) XX(SORT_RIGHT) \ @@ -1571,11 +1571,11 @@ fun parse_key (const string &key_name) -> wint_t { return c | g.name_to_key.at (p); } else if (!strncmp (p, "C-", 2)) { p += 2; - if (*p < '?' || *p > 'z') { + if (*p < '?' || *p > '~') { cerr << "bindings: invalid combination: " << key_name << endl; return WEOF; } - c |= CTRL (toupper (*p)); + c |= CTRL (*p); p += 1; } else { wchar_t w; mbstate_t mb {}; -- cgit v1.2.3-70-g09d2