Check for tputs type via cmake

Instead of testing for ncurses and netbsd.

Fixes #8087.

cmake/ConfigureChecks.cmake

@@ -168,9 +168,9 @@ elseif(HAVE_NCURSES_TERM_H)
   set(TPARM_INCLUDES "${TPARM_INCLUDES}#include <ncurses/term.h>\n")
 endif()
 
-# Solaris and X/Open-conforming systems have a fixed-args tparm
 cmake_push_check_state()
 list(APPEND CMAKE_REQUIRED_LIBRARIES ${CURSES_LIBRARY})
+# Solaris and X/Open-conforming systems have a fixed-args tparm
 check_cxx_source_compiles("
 #define TPARM_VARARGS
 ${TPARM_INCLUDES}
@@ -182,6 +182,23 @@ int main () {
   TPARM_TAKES_VARARGS
 )
 
+
+# Check if tputs needs a function reading an int or char.
+# The only curses I can find that needs a char is OpenIndiana.
+check_cxx_source_compiles("
+#include <curses.h>
+#include <term.h>
+
+static int writer(int b) {
+    return b;
+}
+
+int main() {
+    return tputs(\"foo\", 5, writer);
+}"
+TPUTS_USES_INT_ARG
+)
+
 if(TPARM_TAKES_VARARGS)
   set(TPARM_VARARGS 1)
 else()

config_cmake.h.in

@@ -148,6 +148,9 @@
 /* Use a variadic tparm on NetBSD curses. */
 #cmakedefine TPARM_VARARGS 1
 
+/* The parameter type for the last tputs parameter */
+#cmakedefine TPUTS_USES_INT_ARG 1
+
 /* Define to 1 if tparm accepts a fixed amount of parameters. */
 #cmakedefine TPARM_SOLARIS_KLUDGE 1
 

src/fallback.h

@@ -50,10 +50,9 @@ int fish_mkstemp_cloexec(char *);
 #define WCHAR_MAX INT_MAX
 #endif
 
-/// Under curses, tputs expects an int (*func)(char) as its last parameter, but in ncurses, tputs
-/// expects a int (*func)(int) as its last parameter. tputs_arg_t is defined to always be what tputs
-/// expects. Hopefully.
-#if defined(NCURSES_VERSION) || defined(__NetBSD__)
+/// Both ncurses and NetBSD curses expect an int (*func)(int) as the last parameter for tputs.
+/// Apparently OpenIndiana's curses still uses int (*func)(char) here.
+#if TPUTS_USES_INT_ARG
 using tputs_arg_t = int;
 #else
 using tputs_arg_t = char;