gcc/m2/gm2-libs/SArgs.mod

   1 (* SArgs.mod provides a String interface to the command line arguments.
   2
   3 Copyright (C) 2001-2024 Free Software Foundation, Inc.
   4 Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
   5
   6 This file is part of GNU Modula-2.
   7
   8 GNU Modula-2 is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GNU Modula-2 is distributed in the hope that it will be useful, but
  14 WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  *)
  26
  27 IMPLEMENTATION MODULE SArgs ;
  28
  29 FROM SYSTEM IMPORT TSIZE, ADDRESS ;
  30 FROM UnixArgs IMPORT GetArgC, GetArgV ;
  31
  32 FROM DynamicStrings IMPORT InitStringCharStar,
  33                            InitStringDB, InitStringCharStarDB,
  34                            InitStringCharDB, MultDB, DupDB, SliceDB ;
  35
  36 TYPE
  37    PtrToChar      = POINTER TO CHAR ;
  38    PtrToPtrToChar = POINTER TO PtrToChar ;
  39
  40 (*
  41 #undef GM2_DEBUG_SARGS
  42 if defined(GM2_DEBUG_SARGS)
  43 #  define InitString(X) InitStringDB(X, __FILE__, __LINE__)
  44 #  define InitStringCharStar(X) InitStringCharStarDB(X, __FILE__, __LINE__)
  45 #  define InitStringChar(X) InitStringCharDB(X, __FILE__, __LINE__)
  46 #  define Mult(X,Y) MultDB(X, Y, __FILE__, __LINE__)
  47 #  define Dup(X) DupDB(X, __FILE__, __LINE__)
  48 #  define Slice(X,Y,Z) SliceDB(X, Y, Z, __FILE__, __LINE__)
  49 #endif
  50 *)
  51
  52
  53 (*
  54    GetArg - returns the nth argument from the command line.
  55             The success of the operation is returned.
  56             If TRUE is returned then the string, s, contains a
  57             new string, otherwise s is set to NIL.
  58 *)
  59
  60 PROCEDURE GetArg (VAR s: String; n: CARDINAL) : BOOLEAN ;
  61 VAR
  62    i  : INTEGER ;
  63    a  : ADDRESS ;
  64    ppc: PtrToPtrToChar ;
  65 BEGIN
  66    i := VAL (INTEGER, n) ;
  67    IF i < GetArgC ()
  68    THEN
  69       a := ADDRESS (GetArgV ()) ;
  70       INC (a, n * TSIZE (PtrToChar)) ;
  71       ppc := a ;
  72       s   := InitStringCharStar (ppc^) ;
  73       RETURN TRUE
  74    ELSE
  75       s := NIL ;
  76       RETURN FALSE
  77    END ;
  78 END GetArg ;
  79
  80
  81 (*
  82    Narg - returns the number of arguments available from
  83           command line.
  84 *)
  85
  86 PROCEDURE Narg () : CARDINAL ;
  87 BEGIN
  88    RETURN GetArgC ()
  89 END Narg ;
  90
  91
  92 END SArgs.