csh.h

早期freebsd实现

    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;