emacs / src / prefix-args.c

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/* prefix-args.c - echo each argument, prefixed by a string.
   Jim Blandy <> - September 1992

   When using GCC 2 as the linker in the build process, options
   intended for the linker need to be prefixed with the "-Xlinker"
   option.  If an option takes an argument, we need to use -Xlinker
   twice - once for the option and once for its argument.  For
   example, to run the linker with the options "-Bstatic" "-e"
   "_start", you'd need to pass the following options to GCC:

   -Xlinker -Bstatic -Xlinker -e -Xlinker _start.

   The Emacs makefile used to use a Bourne Shell `for' loop to prefix
   each linker option with "-Xlinker", but 1) the for loop was hairier
   than one might hope because it had to work when there were no
   arguments to pass to the linker - the shell barfs on a loop like

       for arg in ; do echo -Xlinker "$arg"; done

   and 2) the whole compilation command containing this loop seems to
   exit with a non-zero status and halt the build under Ultrix.

   If I can't write a completely portable program to do this in C,
   I'm quitting and taking up gardening.  */

#include <stdio.h>

main (argc, argv)
     int argc;
     char **argv;
  char *progname;
  char *prefix;

  progname = argv[0];
  argc--, argv++;

  if (argc < 1)
      fprintf (stderr, "Usage: %s PREFIX ARGS...\n\
Echo each ARG preceded by PREFIX and a space.\n", progname);
      exit (2);

  prefix = argv[0];
  argc--, argv++;

  for (; argc > 0; argc--, argv++)
    printf ("%s %s%c", prefix, argv[0], (argc > 1) ? ' ' : '\n');

  exit (0);