src/prefix-args.c

   1 /* prefix-args.c - echo each argument, prefixed by a string.
   2    Copyright (C) 1992, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
   3                  2008, 2009, 2010  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* Jim Blandy <jimb@occs.cs.oberlin.edu> - September 1992
  21
  22    When using GCC 2 as the linker in the build process, options
  23    intended for the linker need to be prefixed with the "-Xlinker"
  24    option.  If an option takes an argument, we need to use -Xlinker
  25    twice - once for the option and once for its argument.  For
  26    example, to run the linker with the options "-Bstatic" "-e"
  27    "_start", you'd need to pass the following options to GCC:
  28
  29    -Xlinker -Bstatic -Xlinker -e -Xlinker _start.
  30
  31    The Emacs makefile used to use a Bourne Shell `for' loop to prefix
  32    each linker option with "-Xlinker", but 1) the for loop was hairier
  33    than one might hope because it had to work when there were no
  34    arguments to pass to the linker - the shell barfs on a loop like
  35    this:
  36
  37        for arg in ; do echo -Xlinker "$arg"; done
  38
  39    and 2) the whole compilation command containing this loop seems to
  40    exit with a non-zero status and halt the build under Ultrix.
  41
  42    If I can't write a completely portable program to do this in C,
  43    I'm quitting and taking up gardening.  */
  44
  45 #ifdef HAVE_CONFIG_H
  46 # include <config.h>
  47 #endif
  48
  49 #if STDC_HEADERS
  50 # include <stdlib.h>            /* for proper declaration of `exit' */
  51 #endif
  52
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55
  56 int
  57 main (argc, argv)
  58      int argc;
  59      char **argv;
  60 {
  61   char *progname;
  62   char *prefix;
  63
  64   progname = argv[0];
  65   argc--, argv++;
  66
  67   if (argc < 1)
  68     {
  69       fprintf (stderr, "Usage: %s PREFIX ARGS...\n\
  70 Echo each ARG preceded by PREFIX and a space.\n", progname);
  71       exit (2);
  72     }
  73
  74   prefix = argv[0];
  75   argc--, argv++;
  76
  77   for (; argc > 0; argc--, argv++)
  78     printf ("%s %s%c", prefix, argv[0], (argc > 1) ? ' ' : '\n');
  79
  80   exit (0);
  81 }
  82
  83 /* arch-tag: 08136d70-e5c0-49c7-bcd8-b4850233977a
  84    (do not change this comment) */