Attempt to make bc work on mingw

src/program.c

@@ -24,8 +24,6 @@
 #include <stdbool.h>
 #include <string.h>
 
-#include <unistd.h>
-
 #include <io.h>
 #include <parse.h>
 #include <program.h>
@@ -1332,11 +1330,6 @@ BcStatus bc_program_init(BcProgram *p, size_t line_len,
 
 	assert(p);
 
-	assert((unsigned long) sysconf(_SC_BC_BASE_MAX) <= BC_MAX_OBASE);
-	assert((unsigned long) sysconf(_SC_BC_DIM_MAX) <= BC_MAX_DIM);
-	assert((unsigned long) sysconf(_SC_BC_SCALE_MAX) <= BC_MAX_SCALE);
-	assert((unsigned long) sysconf(_SC_BC_STRING_MAX) <= BC_MAX_STRING);
-
 	p->nchars = p->scale = 0;
 	p->len = line_len;
 	p->parse_init = init;

src/vm.c

@@ -25,15 +25,26 @@
 #include <stdio.h>
 #include <string.h>
 
-#include <sys/types.h>
 #include <signal.h>
+
+#ifndef win32
+
+#include <sys/types.h>
 #include <unistd.h>
 
+#else // win32
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#endif // win32
+
 #include <status.h>
 #include <args.h>
 #include <vm.h>
 #include <io.h>
 
+#ifndef win32
 void bc_vm_sig(int sig) {
 	if (sig == SIGINT) {
 		size_t len = strlen(bcg.sig_msg);
@@ -42,6 +53,15 @@ void bc_vm_sig(int sig) {
 	}
 	else bcg.sig_other = 1;
 }
+#else // win32
+BOOL WINAPI bc_vm_sig(DWORD sig) {
+	if (sig == CTRL_C_EVENT) {
+		if (fputs(bcg.sig_msg) != EOF)
+			bcg.sig += (bcg.signe = bcg.sig == bcg.sigc);
+	}
+	else bcg.sig_other = 1;
+}
+#endif // win32
 
 BcStatus bc_vm_info(const char* const help) {
 	if (printf("%s %s\n", bcg.name, BC_VERSION) < 0) return BC_STATUS_IO_ERR;
@@ -320,11 +340,16 @@ BcStatus bc_vm_init(BcVm *vm, BcVmExe exe, const char *env_len) {
 	sa.sa_handler = bc_vm_sig;
 	sa.sa_flags = 0;
 
+#ifndef win32
 	if (sigaction(SIGINT, &sa, NULL) < 0 || sigaction(SIGPIPE, &sa, NULL) < 0 ||
 	    sigaction(SIGHUP, &sa, NULL) < 0 || sigaction(SIGTERM, &sa, NULL) < 0)
 	{
 		return BC_STATUS_EXEC_SIGACTION_FAIL;
 	}
+#else // win32
+	if (!SetConsoleCtrlHandler(bc_vm_sig, TRUE))
+		return BC_STATUS_EXEC_SIGACTION_FAIL;
+#endif // win32
 
 	vm->exe = exe;
 	vm->flags = 0;