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freebsd-dev/bin/csh/csh.h
Rodney W. Grimes 4b88c807ea BSD 4.4 Lite bin Sources
1994-05-26 06:18:55 +00:00

553 lines
17 KiB
C
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/*-
* 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;
struct wordent *next;
};
/*
* During word building, both in the initial lexical phase and
* when expanding $ variable substitutions, expansion by `!' and `$'
* must be inhibited when reading ahead in routines which are themselves
* processing `!' and `$' expansion or after characters such as `\' or in
* quotations. The following flags are passed to the getC routines
* telling them which of these substitutions are appropriate for the
* next character to be returned.
*/
#define DODOL 1
#define DOEXCL 2
#define DOALL DODOL|DOEXCL
/*
* Labuf implements a general buffer for lookahead during lexical operations.
* Text which is to be placed in the input stream can be stuck here.
* We stick parsed ahead $ constructs during initial input,
* process id's from `$$', and modified variable values (from qualifiers
* during expansion in sh.dol.c) here.
*/
Char *lap;
/*
* Parser structure
*
* Each command is parsed to a tree of command structures and
* flags are set bottom up during this process, to be propagated down
* as needed during the semantics/exeuction pass (sh.sem.c).
*/
struct command {
short t_dtyp; /* Type of node */
#define NODE_COMMAND 1 /* t_dcom <t_dlef >t_drit */
#define NODE_PAREN 2 /* ( t_dspr ) <t_dlef >t_drit */
#define NODE_PIPE 3 /* t_dlef | t_drit */
#define NODE_LIST 4 /* t_dlef ; t_drit */
#define NODE_OR 5 /* t_dlef || t_drit */
#define NODE_AND 6 /* t_dlef && t_drit */
short t_dflg; /* Flags, e.g. F_AMPERSAND|... */
#define F_SAVE (F_NICE|F_TIME|F_NOHUP) /* save these when re-doing */
#define F_AMPERSAND (1<<0) /* executes in background */
#define F_APPEND (1<<1) /* output is redirected >> */
#define F_PIPEIN (1<<2) /* input is a pipe */
#define F_PIPEOUT (1<<3) /* output is a pipe */
#define F_NOFORK (1<<4) /* don't fork, last ()ized cmd */
#define F_NOINTERRUPT (1<<5) /* should be immune from intr's */
/* spare */
#define F_STDERR (1<<7) /* redirect unit 2 with unit 1 */
#define F_OVERWRITE (1<<8) /* output was ! */
#define F_READ (1<<9) /* input redirection is << */
#define F_REPEAT (1<<10) /* reexec aft if, repeat,... */
#define F_NICE (1<<11) /* t_nice is meaningful */
#define F_NOHUP (1<<12) /* nohup this command */
#define F_TIME (1<<13) /* time this command */
union {
Char *T_dlef; /* Input redirect word */
struct command *T_dcar; /* Left part of list/pipe */
} L;
union {
Char *T_drit; /* Output redirect word */
struct command *T_dcdr; /* Right part of list/pipe */
} R;
#define t_dlef L.T_dlef
#define t_dcar L.T_dcar
#define t_drit R.T_drit
#define t_dcdr R.T_dcdr
Char **t_dcom; /* Command/argument vector */
struct command *t_dspr; /* Pointer to ()'d subtree */
int t_nice;
};
/*
* These are declared here because they want to be
* initialized in sh.init.c (to allow them to be made readonly)
*/
extern struct biltins {
char *bname;
void (*bfunct) __P((Char **, struct command *));
short minargs, maxargs;
} bfunc[];
extern int nbfunc;
extern struct srch {
char *s_name;
short s_value;
} srchn[];
extern int nsrchn;
/*
* The keywords for the parser
*/
#define T_BREAK 0
#define T_BRKSW 1
#define T_CASE 2
#define T_DEFAULT 3
#define T_ELSE 4
#define T_END 5
#define T_ENDIF 6
#define T_ENDSW 7
#define T_EXIT 8
#define T_FOREACH 9
#define T_GOTO 10
#define T_IF 11
#define T_LABEL 12
#define T_LET 13
#define T_SET 14
#define T_SWITCH 15
#define T_TEST 16
#define T_THEN 17
#define T_WHILE 18
/*
* Structure defining the existing while/foreach loops at this
* source level. Loops are implemented by seeking back in the
* input. For foreach (fe), the word list is attached here.
*/
struct whyle {
struct Ain w_start; /* Point to restart loop */
struct Ain w_end; /* End of loop (0 if unknown) */
Char **w_fe, **w_fe0; /* Current/initial wordlist for fe */
Char *w_fename; /* Name for fe */
struct whyle *w_next; /* Next (more outer) loop */
} *whyles;
/*
* Variable structure
*
* Aliases and variables are stored in AVL balanced binary trees.
*/
struct varent {
Char **vec; /* Array of words which is the value */
Char *v_name; /* Name of variable/alias */
struct varent *v_link[3]; /* The links, see below */
int v_bal; /* Balance factor */
} shvhed, aliases;
#define v_left v_link[0]
#define v_right v_link[1]
#define v_parent v_link[2]
struct varent *adrof1();
#define adrof(v) adrof1(v, &shvhed)
#define value(v) value1(v, &shvhed)
/*
* The following are for interfacing redo substitution in
* aliases to the lexical routines.
*/
struct wordent *alhistp; /* Argument list (first) */
struct wordent *alhistt; /* Node after last in arg list */
Char **alvec, *alvecp; /* The (remnants of) alias vector */
/*
* Filename/command name expansion variables
*/
int gflag; /* After tglob -> is globbing needed? */
#define MAXVARLEN 30 /* Maximum number of char in a variable name */
/*
* Variables for filename expansion
*/
extern Char **gargv; /* Pointer to the (stack) arglist */
extern long gargc; /* Number args in gargv */
/*
* Variables for command expansion.
*/
extern Char **pargv; /* Pointer to the argv list space */
extern long pargc; /* Count of arguments in pargv */
Char *pargs; /* Pointer to start current word */
long pnleft; /* Number of chars left in pargs */
Char *pargcp; /* Current index into pargs */
/*
* History list
*
* Each history list entry contains an embedded wordlist
* from the scanner, a number for the event, and a reference count
* to aid in discarding old entries.
*
* Essentially "invisible" entries are put on the history list
* when history substitution includes modifiers, and thrown away
* at the next discarding since their event numbers are very negative.
*/
struct Hist {
struct wordent Hlex;
int Hnum;
int Href;
struct Hist *Hnext;
} Histlist;
struct wordent paraml; /* Current lexical word list */
int eventno; /* Next events number */
int lastev; /* Last event reference (default) */
Char HIST; /* history invocation character */
Char HISTSUB; /* auto-substitute character */
/*
* strings.h:
*/
#ifndef SHORT_STRINGS
#define Strchr(a, b) strchr(a, b)
#define Strrchr(a, b) strrchr(a, b)
#define Strcat(a, b) strcat(a, b)
#define Strncat(a, b, c) strncat(a, b, c)
#define Strcpy(a, b) strcpy(a, b)
#define Strncpy(a, b, c) strncpy(a, b, c)
#define Strlen(a) strlen(a)
#define Strcmp(a, b) strcmp(a, b)
#define Strncmp(a, b, c) strncmp(a, b, c)
#define Strspl(a, b) strspl(a, b)
#define Strsave(a) strsave(a)
#define Strend(a) strend(a)
#define Strstr(a, b) strstr(a, b)
#define str2short(a) (a)
#define blk2short(a) saveblk(a)
#define short2blk(a) saveblk(a)
#define short2str(a) strip(a)
#else
#define Strchr(a, b) s_strchr(a, b)
#define Strrchr(a, b) s_strrchr(a, b)
#define Strcat(a, b) s_strcat(a, b)
#define Strncat(a, b, c) s_strncat(a, b, c)
#define Strcpy(a, b) s_strcpy(a, b)
#define Strncpy(a, b, c) s_strncpy(a, b, c)
#define Strlen(a) s_strlen(a)
#define Strcmp(a, b) s_strcmp(a, b)
#define Strncmp(a, b, c) s_strncmp(a, b, c)
#define Strspl(a, b) s_strspl(a, b)
#define Strsave(a) s_strsave(a)
#define Strend(a) s_strend(a)
#define Strstr(a, b) s_strstr(a, b)
#endif
/*
* setname is a macro to save space (see sh.err.c)
*/
char *bname;
#define setname(a) (bname = (a))
Char *Vsav;
Char *Vdp;
Char *Vexpath;
char **Vt;
Char **evalvec;
Char *evalp;
/* word_chars is set by default to WORD_CHARS but can be overridden by
the worchars variable--if unset, reverts to WORD_CHARS */
Char *word_chars;
#define WORD_CHARS "*?_-.[]~=" /* default chars besides alnums in words */
Char *STR_SHELLPATH;
#include <paths.h>
#ifdef _PATH_BSHELL
Char *STR_BSHELL;
#endif
Char *STR_WORD_CHARS;
Char **STR_environ;
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