Patch for the Caml-Light runtime.

Patch for the Caml-Light runtime.

[Damien Doligez]

This patch will solve the problem of extra arguments being passed to
executable byte-code files on a variety of Unix systems (Pyramid,
Sequent, HP-UX, ...)  You need to install this patch if the "fib"
program in the "examples/basics" directory replies "Bad integer
constant" even when you give it a correct number as argument.

It is harmless to install this patch on systems where it is not
needed.

To install this patch, save this mail in your Caml Light source
directory "src/runtime" as file "patch1", go to that directory and
type "patch <patch1".  (You will need the "patch" utility, which is
widely available in source form. (e.g. from ftp.inria.fr))
Then recompile and reinstall Caml Light.  (If you know what you are
doing, you can recompile and reinstall only the runtime.)

*** main.c	Mon Jul 19 01:20:51 1993
--- main.c.new	Tue Apr  5 21:03:34 1994
***************
*** 58,75 ****
  
  extern char * searchpath();
  
! int attempt_open(name, trail)
       char ** name;
       struct exec_trailer * trail;
  {
    char * truename;
    int fd;
    int err;
  
    truename = searchpath(*name);
    if (truename == 0) truename = *name; else *name = truename;
    fd = open(truename, O_RDONLY | O_BINARY);
    if (fd == -1) return FILE_NOT_FOUND;
    err = read_trailer(fd, trail);
    if (err != 0) { close(fd); return err; }
    return fd;
--- 58,82 ----
  
  extern char * searchpath();
  
! int attempt_open(name, trail, do_open_script)
       char ** name;
       struct exec_trailer * trail;
+      int do_open_script;
  {
    char * truename;
    int fd;
    int err;
+   char buf [2];
  
    truename = searchpath(*name);
    if (truename == 0) truename = *name; else *name = truename;
    fd = open(truename, O_RDONLY | O_BINARY);
    if (fd == -1) return FILE_NOT_FOUND;
+   if (!do_open_script){
+     err = read (fd, buf, 2);
+     if (err < 2) return TRUNCATED_FILE;
+     if (buf [0] == '#' && buf [1] == '!') return BAD_MAGIC_NUM;
+   }
    err = read_trailer(fd, trail);
    if (err != 0) { close(fd); return err; }
    return fd;
***************
*** 82,87 ****
--- 89,115 ----
    "usage: camlrun [-v] [-V] [-g generation size] [-F free mem %] <file> <args>\n";
  #endif
  
+ /* Invocation of camlrun: 4 cases.
+ 
+    1.  runtime + bytecode
+        user types:  camlrun [options] bytecode args...
+        arguments:  camlrun [options] bytecode args...
+ 
+    2.  bytecode script
+        user types:  bytecode args...
+     a  arguments: (kernel1)  camlrun ./bytecode args...
+     b  arguments: (kernel2)  bytecode bytecode args...
+ 
+    3.  concatenated runtime and bytecode
+        user types:  composite args...
+        arguments:  composite args...
+ 
+ Algorithm: try to use the first argument as a byte-code file, except when
+ it starts with #! (case 2b).  If that fails (cases 1 and 2a) or if the file
+ starts with #!, parse the line as: (whatever) [options] bytecode args...
+ 
+ */
+ 
  int main(argc, argv)
       int argc;
       char * argv[];
***************
*** 108,114 ****
  #endif
  
    i = 0;
!   fd = attempt_open(&argv[0], &trail);
  
    if (fd < 0) {
  
--- 136,142 ----
  #endif
  
    i = 0;
!   fd = attempt_open(&argv[0], &trail, 0);
  
    if (fd < 0) {
  
***************
*** 149,155 ****
        exit(2);
      }
  
!     fd = attempt_open(&argv[i], &trail);
  
      switch(fd) {
      case FILE_NOT_FOUND:
--- 177,183 ----
        exit(2);
      }
  
!     fd = attempt_open(&argv[i], &trail, 1);
  
      switch(fd) {
      case FILE_NOT_FOUND: