nrj-oisc

commit f560cc5cbdcc96a162049e546be89d90cec5264d
parent 1ce0c339caac58fabba11b8a8e5ff4b7915faf81
Author: Luxferre <lux@ferre>
Date:   Tue, 23 Aug 2022 21:06:48 +0300

Perfection is attained not when there's nothing to add but when there's nothing to take away

Diffstat:
M
nrj.c
 | 
24
++++++++----------------

1 file changed, 8 insertions(+), 16 deletions(-)
diff --git a/nrj.c b/nrj.c
@@ -1,8 +1,6 @@
-/*
- * NRJ (NOR and Reference Jump) OISC ANSI C emulator
+/* NRJ (NOR and Reference Jump) OISC ANSI C emulator
  * Created by Luxferre, 2022, public domain
- * Build with: cc -Os -std=c89 -o nrj nrj.c
- */
+ * Build with: cc -Os -std=c89 -o nrj nrj.c */
 #include <stdlib.h>
 #include <stdio.h>
 #include <termios.h>
@@ -49,15 +47,14 @@ void nrj_run(NRJWORD *mem, NRJWORD pc) { /* Main NRJ engine - just 12 lines of C
   }
 }
 
-/* terminal helper definitions */
-struct termios tty_opts_backup, tty_opts_raw;
+struct termios tty_opts_backup, tty_opts_raw; /* terminal I/O helper definitions */
 void restore_term() {tcsetattr(0, TCSANOW, &tty_opts_backup);}
 
 int main(int argc, char* argv[]) { /* emulator entry point: nrj program.bin */
   if(argc > 1) {
-    NRJWORD mem[NRJSIZE]; /* NRJ memory: word 0 - input, 1 - output, 2 - I/O context, 3 - program start */
     FILE *prog = fopen(argv[1], "rb");
     if(prog) { /* load the program and prepare the terminal */
+      NRJWORD mem[NRJSIZE]; /* NRJ memory: word 0 - input, 1 - output, 2 - I/O context, 3 - program start */
       fseek(prog, 0, SEEK_END);
       int flen = ftell(prog);
       fseek(prog, 0, SEEK_SET);
@@ -68,14 +65,9 @@ int main(int argc, char* argv[]) { /* emulator entry point: nrj program.bin */
       cfmakeraw(&tty_opts_raw);
       tcsetattr(0, TCSANOW, &tty_opts_raw);
       nrj_run(mem, 3); /* now, start the engine */
+      return 0; /* return the successful status to the outer OS */
     }
-    else {
-      printf("NRJ%u: could not open the input file %s\r\n", (unsigned int) NRJWSIZE, argv[1]);
-      return 1;
-    }
-  } else {
-    printf("NRJ%u: no binary specified\r\n", (unsigned int) NRJWSIZE);
-    return 1;
-  }
-  return 0;
+  } /* otherwise bail out with an error */
+  printf("NRJ%u: no valid program binary specified\r\n", (unsigned int) NRJWSIZE);
+  return 1;
 }