usr/src/bin/sh/parser.h

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)parser.h    5.1 (Berkeley) %G%
 */

/* control characters in argument strings */
#define CTLESC '\201'
#define CTLVAR '\202'
#define CTLENDVAR '\203'
#define CTLBACKQ '\204'
#define CTLQUOTE 01             /* ored with CTLBACKQ code if in quotes */

/* variable substitution byte (follows CTLVAR) */
#define VSTYPE 07               /* type of variable substitution */
#define VSNUL 040               /* colon--treat the empty string as unset */
#define VSQUOTE 0100            /* inside double quotes--suppress splitting */

/* values of VSTYPE field */
#define VSNORMAL 1              /* normal variable:  $var or ${var} */
#define VSMINUS 2               /* ${var-text} */
#define VSPLUS 3                /* ${var+text} */
#define VSQUESTION 4            /* ${var?message} */
#define VSASSIGN 5              /* ${var=text} */


/*
 * NEOF is returned by parsecmd when it encounters an end of file.  It
 * must be distinct from NULL, so we use the address of a variable that
 * happens to be handy.
 */
extern int tokpushback;
#define NEOF ((union node *)&tokpushback)


#ifdef __STDC__
union node *parsecmd(int);
int goodname(char *);
#else
union node *parsecmd();
int goodname();
#endif