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/* Shell command argument quoting.
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   Copyright (C) 1994, 1995, 1997 Free Software Foundation, Inc.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2, or (at your option)
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   any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; see the file COPYING.
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   If not, write to the Free Software Foundation,
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   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
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/* Written by Paul Eggert <eggert@twinsun.com> */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <sys/types.h>
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#include <quotearg.h>
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/* Place into QUOTED a quoted version of ARG suitable for `system'.
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   Return the length of the resulting string (which is not null-terminated).
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   If QUOTED is null, return the length without any side effects.  */
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size_t
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quote_system_arg (quoted, arg)
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     char *quoted;
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     char const *arg;
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{
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  char const *a;
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  size_t len = 0;
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  /* Scan ARG, copying it to QUOTED if QUOTED is not null,
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     looking for shell metacharacters.  */
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  for (a = arg; ; a++)
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    {
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      char c = *a;
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      switch (c)
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	{
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	case 0:
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	  /* ARG has no shell metacharacters.  */
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	  return len;
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	case '=':
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	  if (*arg == '-')
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	    break;
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	  /* Fall through.  */
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	case '\t': case '\n': case ' ':
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	case '!': case '"': case '#': case '$': case '%': case '&': case '\'':
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	case '(': case ')': case '*': case ';':
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	case '<': case '>': case '?': case '[': case '\\':
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	case '^': case '`': case '|': case '~':
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	  {
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	    /* ARG has a shell metacharacter.
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	       Start over, quoting it this time.  */
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	    len = 0;
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	    c = *arg++;
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	    /* If ARG is an option, quote just its argument.
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	       This is not necessary, but it looks nicer.  */
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	    if (c == '-'  &&  arg < a)
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	      {
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		c = *arg++;
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		if (quoted)
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		  {
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		    quoted[len] = '-';
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		    quoted[len + 1] = c;
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		  }
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		len += 2;
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		if (c == '-')
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		  while (arg < a)
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		    {
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		      c = *arg++;
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		      if (quoted)
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			quoted[len] = c;
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		      len++;
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		      if (c == '=')
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			break;
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		    }
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		c = *arg++;
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	      }
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	    if (quoted)
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	      quoted[len] = '\'';
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	    len++;
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	    for (;  c;  c = *arg++)
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	      {
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		if (c == '\'')
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		  {
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		    if (quoted)
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		      {
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			quoted[len] = '\'';
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			quoted[len + 1] = '\\';
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			quoted[len + 2] = '\'';
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		      }
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		    len += 3;
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		  }
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		if (quoted)
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		  quoted[len] = c;
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		len++;
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	      }
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	    if (quoted)
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	      quoted[len] = '\'';
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	    return len + 1;
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	  }
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	}
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      if (quoted)
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	quoted[len] = c;
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      len++;
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    }
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}