perf tui slang: Tidy casts

Casts were necessary for older versions of libslang, however, these
are now 15 years old and so we no longer need to care about supporting
them. Tidy the casts and remove unnecessary logic.

Move the ENABLE_SLFUTURE_CONST to the libslang.h common include file,
and also enable ENABLE_SLFUTURE_VOID.

Signed-off-by: Ian Rogers <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Athira Rajeev <[e-mail]>
Cc: Huacai Chen <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: John Garry <[e-mail]>
Cc: K Prateek Nayak <[e-mail]>
Cc: Kajol Jain <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Mike Leach <[e-mail]>
Cc: Ming Wang <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Ravi Bangoria <[e-mail]>
Cc: Sean Christopherson <[e-mail]>
Cc: Suzuki Poulouse <[e-mail]>
Cc: Wei Li <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/ui/Build

···
 perf-$(CONFIG_SLANG) += browser.o
 perf-$(CONFIG_SLANG) += browsers/
 perf-$(CONFIG_SLANG) += tui/
-
-CFLAGS_browser.o += -DENABLE_SLFUTURE_CONST

tools/perf/ui/browser.c

···
 void ui_browser__write_nstring(struct ui_browser *browser __maybe_unused, const char *msg,
 			       unsigned int width)
 {
-	slsmg_write_nstring(msg, width);
+	SLsmg_write_nstring(msg, width);
 }
 
 void ui_browser__vprintf(struct ui_browser *browser __maybe_unused, const char *fmt, va_list args)
 {
-	slsmg_vprintf(fmt, args);
+	SLsmg_vprintf(fmt, args);
 }
 
 void ui_browser__printf(struct ui_browser *browser __maybe_unused, const char *fmt, ...)
···
 
 	while (ui_browser__colorsets[i].name) {
 		struct ui_browser_colorset *c = &ui_browser__colorsets[i++];
-		sltt_set_color(c->colorset, c->name, c->fg, c->bg);
+		SLtt_set_color(c->colorset, c->name, c->fg, c->bg);
 	}
 }

tools/perf/ui/browsers/Build

···
 perf-y += scripts.o
 perf-y += header.o
 perf-y += res_sample.o
-
-CFLAGS_annotate.o += -DENABLE_SLFUTURE_CONST
-CFLAGS_hists.o    += -DENABLE_SLFUTURE_CONST
-CFLAGS_map.o      += -DENABLE_SLFUTURE_CONST
-CFLAGS_scripts.o  += -DENABLE_SLFUTURE_CONST

tools/perf/ui/libslang.h

···
 #define HAVE_LONG_LONG __GLIBC_HAVE_LONG_LONG
 #endif
 
+/* Enable future slang's corrected function prototypes. */
+#define ENABLE_SLFUTURE_CONST 1
+#define ENABLE_SLFUTURE_VOID 1
+
 #ifdef HAVE_SLANG_INCLUDE_SUBDIR
 #include <slang/slang.h>
 #else
 #include <slang.h>
-#endif
-
-#if SLANG_VERSION < 20104
-#define slsmg_printf(msg, args...) \
-	SLsmg_printf((char *)(msg), ##args)
-#define slsmg_vprintf(msg, vargs) \
-	SLsmg_vprintf((char *)(msg), vargs)
-#define slsmg_write_nstring(msg, len) \
-	SLsmg_write_nstring((char *)(msg), len)
-#define sltt_set_color(obj, name, fg, bg) \
-	SLtt_set_color(obj,(char *)(name), (char *)(fg), (char *)(bg))
-#else
-#define slsmg_printf SLsmg_printf
-#define slsmg_vprintf SLsmg_vprintf
-#define slsmg_write_nstring SLsmg_write_nstring
-#define sltt_set_color SLtt_set_color
 #endif
 
 #define SL_KEY_UNTAB 0x1000

tools/perf/ui/tui/helpline.c

···
 
 	SLsmg_gotorc(SLtt_Screen_Rows - 1, 0);
 	SLsmg_set_color(0);
-	SLsmg_write_nstring((char *)msg, SLtt_Screen_Cols);
+	SLsmg_write_nstring(msg, SLtt_Screen_Cols);
 	SLsmg_refresh();
 	strlcpy(ui_helpline__current, msg, sz);
 }

tools/perf/ui/tui/setup.c

···
 		goto out;
 	}
 
-	SLkp_define_keysym((char *)"^(kB)", SL_KEY_UNTAB);
+	SLkp_define_keysym("^(kB)", SL_KEY_UNTAB);
 
 	signal(SIGSEGV, ui__signal_backtrace);
 	signal(SIGFPE, ui__signal_backtrace);

tools/perf/ui/tui/util.c

···
 	SLsmg_draw_box(y, x++, nr_lines, max_len);
 	if (title) {
 		SLsmg_gotorc(y, x + 1);
-		SLsmg_write_string((char *)title);
+		SLsmg_write_string(title);
 	}
 	SLsmg_gotorc(++y, x);
 	nr_lines -= 7;
···
 	len = 5;
 	while (len--) {
 		SLsmg_gotorc(y + len - 1, x);
-		SLsmg_write_nstring((char *)" ", max_len);
+		SLsmg_write_nstring(" ", max_len);
 	}
 	SLsmg_draw_box(y++, x + 1, 3, max_len - 2);
 
 	SLsmg_gotorc(y + 3, x);
-	SLsmg_write_nstring((char *)exit_msg, max_len);
+	SLsmg_write_nstring(exit_msg, max_len);
 	SLsmg_refresh();
 
 	mutex_unlock(&ui__lock);
···
 	SLsmg_draw_box(y, x++, nr_lines, max_len);
 	if (title) {
 		SLsmg_gotorc(y, x + 1);
-		SLsmg_write_string((char *)title);
+		SLsmg_write_string(title);
 	}
 	SLsmg_gotorc(++y, x);
 	if (exit_msg)
···
 				   nr_lines, max_len, 1);
 	if (exit_msg) {
 		SLsmg_gotorc(y + nr_lines - 2, x);
-		SLsmg_write_nstring((char *)" ", max_len);
+		SLsmg_write_nstring(" ", max_len);
 		SLsmg_gotorc(y + nr_lines - 1, x);
-		SLsmg_write_nstring((char *)exit_msg, max_len);
+		SLsmg_write_nstring(exit_msg, max_len);
 	}
 }