csh.h

早期freebsd实现

/*-
 * Copyright (c) 1980, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)csh.h	8.1 (Berkeley) 5/31/93
 */

/*
 * Fundamental definitions which may vary from system to system.
 *
 *	BUFSIZ		The i/o buffering size; also limits word size
 *	MAILINTVL	How often to mailcheck; more often is more expensive
 */
#ifndef BUFSIZ
#define	BUFSIZ	1024		/* default buffer size */
#endif				/* BUFSIZ */

#define FORKSLEEP	10	/* delay loop on non-interactive fork failure */
#define	MAILINTVL	600	/* 10 minutes */

/*
 * The shell moves std in/out/diag and the old std input away from units
 * 0, 1, and 2 so that it is easy to set up these standards for invoked
 * commands.
 */
#define	FSHTTY	15		/* /dev/tty when manip pgrps */
#define	FSHIN	16		/* Preferred desc for shell input */
#define	FSHOUT	17		/* ... shell output */
#define	FSHERR	18		/* ... shell diagnostics */
#define	FOLDSTD	19		/* ... old std input */

#ifdef PROF
#define	xexit(n)	done(n)
#endif

#ifdef SHORT_STRINGS
typedef short Char;

#define SAVE(a) (Strsave(str2short(a)))
#else
typedef char Char;

#define SAVE(a) (strsave(a))
#endif

/*
 * Make sure a variable is not stored in a register by taking its address
 * This is used where variables might be clobbered by longjmp.
 */
#define UNREGISTER(a)	(void) &a

typedef void *ioctl_t;		/* Third arg of ioctl */

typedef void *ptr_t;

#include "const.h"
#include "char.h"
#include "err.h"

#define xmalloc(i)	Malloc(i)
#define xrealloc(p, i)	Realloc(p, i)
#define xcalloc(n, s)	Calloc(n, s)
#define xfree(p)	Free(p)

#include <stdio.h>
FILE *cshin, *cshout, *csherr;

#define	isdir(d)	((d.st_mode & S_IFMT) == S_IFDIR)

typedef int bool;

#define	eq(a, b)	(Strcmp(a, b) == 0)

/* globone() flags */
#define G_ERROR		0	/* default action: error if multiple words */
#define G_IGNORE	1	/* ignore the rest of the words */
#define G_APPEND	2	/* make a sentence by cat'ing the words */

/*
 * Global flags
 */
bool    chkstop;		/* Warned of stopped jobs... allow exit */
bool    didfds;			/* Have setup i/o fd's for child */
bool    doneinp;		/* EOF indicator after reset from readc */
bool    exiterr;		/* Exit if error or non-zero exit status */
bool    child;			/* Child shell ... errors cause exit */
bool    haderr;			/* Reset was because of an error */
bool    intty;			/* Input is a tty */
bool    intact;			/* We are interactive... therefore prompt */
bool    justpr;			/* Just print because of :p hist mod */
bool    loginsh;		/* We are a loginsh -> .login/.logout */
bool    neednote;		/* Need to pnotify() */
bool    noexec;			/* Don't execute, just syntax check */
bool    pjobs;			/* want to print jobs if interrupted */
bool    setintr;		/* Set interrupts on/off -> Wait intr... */
bool    timflg;			/* Time the next waited for command */
bool    havhash;		/* path hashing is available */

#ifdef FILEC
bool    filec;			/* doing filename expansion */
#endif

/*
 * Global i/o info
 */
Char   *arginp;			/* Argument input for sh -c and internal `xx` */
int     onelflg;		/* 2 -> need line for -t, 1 -> exit on read */
Char   *ffile;			/* Name of shell file for $0 */

char   *seterr;			/* Error message from scanner/parser */
Char   *shtemp;			/* Temp name for << shell files in /tmp */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>

struct timeval time0;		/* Time at which the shell started */
struct rusage ru0;

/*
 * Miscellany
 */
Char   *doldol;			/* Character pid for $$ */
int	backpid;		/* Pid of the last background process */
int     uid, euid;		/* Invokers uid */
int     gid, egid;		/* Invokers gid */
time_t  chktim;			/* Time mail last checked */
int     shpgrp;			/* Pgrp of shell */
int     tpgrp;			/* Terminal process group */

/* If tpgrp is -1, leave tty alone! */
int     opgrp;			/* Initial pgrp and tty pgrp */


/*
 * To be able to redirect i/o for builtins easily, the shell moves the i/o
 * descriptors it uses away from 0,1,2.
 * Ideally these should be in units which are closed across exec's
 * (this saves work) but for version 6, this is not usually possible.
 * The desired initial values for these descriptors are F{SHIN,...}.
 */
int   SHIN;			/* Current shell input (script) */
int   SHOUT;			/* Shell output */
int   SHERR;			/* Diagnostic output... shell errs go here */
int   OLDSTD;			/* Old standard input (def for cmds) */

/*
 * Error control
 *
 * Errors in scanning and parsing set up an error message to be printed
 * at the end and complete.  Other errors always cause a reset.
 * Because of source commands and .cshrc we need nested error catches.
 */

#include <setjmp.h>
jmp_buf reslab;

#define	setexit()	(setjmp(reslab))
#define	reset()		longjmp(reslab, 1)
 /* Should use structure assignment here */
#define	getexit(a)	bcopy((char *)reslab, ((char *)(a)), sizeof reslab)
#define	resexit(a)	bcopy((char *)(a), (char *)reslab, sizeof reslab)

Char   *gointr;			/* Label for an onintr transfer */

#include <signal.h>
sig_t parintr;			/* Parents interrupt catch */
sig_t parterm;			/* Parents terminate catch */

/*
 * Lexical definitions.
 *
 * All lexical space is allocated dynamically.
 * The eighth/sixteenth bit of characters is used to prevent recognition,
 * and eventually stripped.
 */
#define	META		0200
#define	ASCII		0177
#ifdef SHORT_STRINGS
#define	CHAR		0377
#define	QUOTE 		0100000	/* 16nth char bit used for 'ing */
#define	TRIM		0077777	/* Mask to strip quote bit */
#else
#define	CHAR		0177
#define	QUOTE 		0200	/* Eighth char bit used for 'ing */
#define	TRIM		0177	/* Mask to strip quote bit */
#endif

int     AsciiOnly;		/* If set only 7 bits is expected in characters */

/*
 * Each level of input has a buffered input structure.
 * There are one or more blocks of buffered input for each level,
 * exactly one if the input is seekable and tell is available.
 * In other cases, the shell buffers enough blocks to keep all loops
 * in the buffer.
 */
struct Bin {
    off_t   Bfseekp;		/* Seek pointer */
    off_t   Bfbobp;		/* Seekp of beginning of buffers */
    off_t   Bfeobp;		/* Seekp of end of buffers */
    int     Bfblocks;		/* Number of buffer blocks */
    Char  **Bfbuf;		/* The array of buffer blocks */
}       B;

/*
 * This structure allows us to seek inside aliases
 */
struct Ain {
    int type;
#define I_SEEK -1		/* Invalid seek */
#define A_SEEK	0		/* Alias seek */
#define F_SEEK	1		/* File seek */
#define E_SEEK	2		/* Eval seek */
    union {
	off_t _f_seek;
	Char* _c_seek;
    } fc;
#define f_seek fc._f_seek
#define c_seek fc._c_seek
    Char **a_seek;
} ;
extern int aret;		/* What was the last character returned */
#define SEEKEQ(a, b) ((a)->type == (b)->type && \
		      (a)->f_seek == (b)->f_seek && \
		      (a)->a_seek == (b)->a_seek)

#define	fseekp	B.Bfseekp
#define	fbobp	B.Bfbobp
#define	feobp	B.Bfeobp
#define	fblocks	B.Bfblocks
#define	fbuf	B.Bfbuf

/*
 * The shell finds commands in loops by reseeking the input
 * For whiles, in particular, it reseeks to the beginning of the
 * line the while was on; hence the while placement restrictions.
 */
struct Ain lineloc;

bool    cantell;		/* Is current source tellable ? */

/*
 * Input lines are parsed into doubly linked circular
 * lists of words of the following form.
 */
struct wordent {
    Char   *word;
    struct wordent *prev;