src/prefix-args.c

   1 /* prefix-args.c - echo each argument, prefixed by a string.
   2    Copyright (C) 1992 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* Jim Blandy <jimb@occs.cs.oberlin.edu> - September 1992
  22
  23    When using GCC 2 as the linker in the build process, options
  24    intended for the linker need to be prefixed with the "-Xlinker"
  25    option.  If an option takes an argument, we need to use -Xlinker
  26    twice - once for the option and once for its argument.  For
  27    example, to run the linker with the options "-Bstatic" "-e"
  28    "_start", you'd need to pass the following options to GCC:
  29
  30    -Xlinker -Bstatic -Xlinker -e -Xlinker _start.
  31
  32    The Emacs makefile used to use a Bourne Shell `for' loop to prefix
  33    each linker option with "-Xlinker", but 1) the for loop was hairier
  34    than one might hope because it had to work when there were no
  35    arguments to pass to the linker - the shell barfs on a loop like
  36    this:
  37
  38        for arg in ; do echo -Xlinker "$arg"; done
  39
  40    and 2) the whole compilation command containing this loop seems to
  41    exit with a non-zero status and halt the build under Ultrix.
  42
  43    If I can't write a completely portable program to do this in C,
  44    I'm quitting and taking up gardening.  */
  45
  46 #include <stdio.h>
  47
  48 int
  49 main (argc, argv)
  50      int argc;
  51      char **argv;
  52 {
  53   char *progname;
  54   char *prefix;
  55
  56   progname = argv[0];
  57   argc--, argv++;
  58
  59   if (argc < 1)
  60     {
  61       fprintf (stderr, "Usage: %s PREFIX ARGS...\n\
  62 Echo each ARG preceded by PREFIX and a space.\n", progname);
  63       exit (2);
  64     }
  65
  66   prefix = argv[0];
  67   argc--, argv++;
  68
  69   for (; argc > 0; argc--, argv++)
  70     printf ("%s %s%c", prefix, argv[0], (argc > 1) ? ' ' : '\n');
  71
  72   exit (0);
  73 }