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freebsd/gnu/usr.bin/awk/awk.h
Andrey A. Chernov e82aeeb5ef Use -lgnuregex 
Tune for 8bit ctype
1995-01-11 06:14:14 +00:00

791 lines
21 KiB
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/*
* awk.h -- Definitions for gawk.
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Progamming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GAWK; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* ------------------------------ Includes ------------------------------ */
#include "config.h"
#include <stdio.h>
#ifndef LIMITS_H_MISSING
#include <limits.h>
#endif
#include <ctype.h>
#include <setjmp.h>
#include <varargs.h>
#include <time.h>
#include <errno.h>
#if !defined(errno) && !defined(MSDOS) && !defined(OS2)
extern int errno;
#endif
#ifdef __GNU_LIBRARY__
#ifndef linux
#include <signum.h>
#endif
#endif
/* ----------------- System dependencies (with more includes) -----------*/
#if defined(__FreeBSD__)
# include <floatingpoint.h>
#endif
#if !defined(VMS) || (!defined(VAXC) && !defined(__DECC))
#include <sys/types.h>
#include <sys/stat.h>
#else /* VMS w/ VAXC or DECC */
#include <types.h>
#include <stat.h>
#include <file.h> /* avoid <fcntl.h> in io.c */
#endif
#include <signal.h>
#ifdef __STDC__
#define P(s) s
#define MALLOC_ARG_T size_t
#else
#define P(s) ()
#define MALLOC_ARG_T unsigned
#define volatile
#define const
#endif
#ifndef SIGTYPE
#define SIGTYPE void
#endif
#ifdef SIZE_T_MISSING
typedef unsigned int size_t;
#endif
#ifndef SZTC
#define SZTC
#define INTC
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#include <string.h>
#ifdef NeXT
#include <libc.h>
#undef atof
#else
#if defined(atarist) || defined(VMS)
#include <unixlib.h>
#else /* atarist || VMS */
#if !defined(MSDOS) && !defined(_MSC_VER)
#include <unistd.h>
#endif /* MSDOS */
#endif /* atarist || VMS */
#endif /* Next */
#else /* STDC_HEADERS */
#include "protos.h"
#endif /* STDC_HEADERS */
#if defined(ultrix) && !defined(Ultrix41)
extern char * getenv P((char *name));
extern double atof P((char *s));
#endif
#ifndef __GNUC__
#ifdef sparc
/* nasty nasty SunOS-ism */
#include <alloca.h>
#ifdef lint
extern char *alloca();
#endif
#else /* not sparc */
#if !defined(alloca) && !defined(ALLOCA_PROTO)
#if defined(_MSC_VER)
#include <malloc.h>
#else
extern char *alloca();
#endif /* _MSC_VER */
#endif
#endif /* sparc */
#endif /* __GNUC__ */
#ifdef HAVE_UNDERSCORE_SETJMP
/* nasty nasty berkelixm */
#define setjmp _setjmp
#define longjmp _longjmp
#endif
/*
* if you don't have vprintf, try this and cross your fingers.
*/
#if defined(VPRINTF_MISSING)
#define vfprintf(fp,fmt,arg) _doprnt((fmt), (arg), (fp))
#endif
#ifdef VMS
/* some macros to redirect to code in vms/vms_misc.c */
#define exit vms_exit
#define open vms_open
#define strerror vms_strerror
#define strdup vms_strdup
extern void exit P((int));
extern int open P((const char *,int,...));
extern char *strerror P((int));
extern char *strdup P((const char *str));
extern int vms_devopen P((const char *,int));
# ifndef NO_TTY_FWRITE
#define fwrite tty_fwrite
#define fclose tty_fclose
extern size_t fwrite P((const void *,size_t,size_t,FILE *));
extern int fclose P((FILE *));
# endif
extern FILE *popen P((const char *,const char *));
extern int pclose P((FILE *));
extern void vms_arg_fixup P((int *,char ***));
/* some things not in STDC_HEADERS */
extern size_t gnu_strftime P((char *,size_t,const char *,const struct tm *));
extern int unlink P((const char *));
extern int getopt P((int,char **,char *));
extern int isatty P((int));
#ifndef fileno
extern int fileno P((FILE *));
#endif
extern int close(), dup(), dup2(), fstat(), read(), stat();
extern int getpgrp P((void));
#endif /*VMS*/
#define GNU_REGEX
#ifdef GNU_REGEX
#include "gnuregex.h"
#include "dfa.h"
typedef struct Regexp {
struct re_pattern_buffer pat;
struct re_registers regs;
struct dfa dfareg;
int dfa;
} Regexp;
#define RESTART(rp,s) (rp)->regs.start[0]
#define REEND(rp,s) (rp)->regs.end[0]
#else /* GNU_REGEX */
#endif /* GNU_REGEX */
#ifdef atarist
#define read _text_read /* we do not want all these CR's to mess our input */
extern int _text_read (int, char *, int);
#ifndef __MINT__
#undef NGROUPS_MAX
#endif /* __MINT__ */
#endif
#ifndef DEFPATH
#define DEFPATH ".:/usr/local/lib/awk:/usr/lib/awk"
#endif
#ifndef ENVSEP
#define ENVSEP ':'
#endif
extern double double_to_int P((double d));
/* ------------------ Constants, Structures, Typedefs ------------------ */
#define AWKNUM double
typedef enum {
/* illegal entry == 0 */
Node_illegal,
/* binary operators lnode and rnode are the expressions to work on */
Node_times,
Node_quotient,
Node_mod,
Node_plus,
Node_minus,
Node_cond_pair, /* conditional pair (see Node_line_range) */
Node_subscript,
Node_concat,
Node_exp,
/* unary operators subnode is the expression to work on */
/*10*/ Node_preincrement,
Node_predecrement,
Node_postincrement,
Node_postdecrement,
Node_unary_minus,
Node_field_spec,
/* assignments lnode is the var to assign to, rnode is the exp */
Node_assign,
Node_assign_times,
Node_assign_quotient,
Node_assign_mod,
/*20*/ Node_assign_plus,
Node_assign_minus,
Node_assign_exp,
/* boolean binaries lnode and rnode are expressions */
Node_and,
Node_or,
/* binary relationals compares lnode and rnode */
Node_equal,
Node_notequal,
Node_less,
Node_greater,
Node_leq,
/*30*/ Node_geq,
Node_match,
Node_nomatch,
/* unary relationals works on subnode */
Node_not,
/* program structures */
Node_rule_list, /* lnode is a rule, rnode is rest of list */
Node_rule_node, /* lnode is pattern, rnode is statement */
Node_statement_list, /* lnode is statement, rnode is more list */
Node_if_branches, /* lnode is to run on true, rnode on false */
Node_expression_list, /* lnode is an exp, rnode is more list */
Node_param_list, /* lnode is a variable, rnode is more list */
/* keywords */
/*40*/ Node_K_if, /* lnode is conditonal, rnode is if_branches */
Node_K_while, /* lnode is condtional, rnode is stuff to run */
Node_K_for, /* lnode is for_struct, rnode is stuff to run */
Node_K_arrayfor, /* lnode is for_struct, rnode is stuff to run */
Node_K_break, /* no subs */
Node_K_continue, /* no stuff */
Node_K_print, /* lnode is exp_list, rnode is redirect */
Node_K_printf, /* lnode is exp_list, rnode is redirect */
Node_K_next, /* no subs */
Node_K_exit, /* subnode is return value, or NULL */
/*50*/ Node_K_do, /* lnode is conditional, rnode stuff to run */
Node_K_return,
Node_K_delete,
Node_K_getline,
Node_K_function, /* lnode is statement list, rnode is params */
/* I/O redirection for print statements */
Node_redirect_output, /* subnode is where to redirect */
Node_redirect_append, /* subnode is where to redirect */
Node_redirect_pipe, /* subnode is where to redirect */
Node_redirect_pipein, /* subnode is where to redirect */
Node_redirect_input, /* subnode is where to redirect */
/* Variables */
/*60*/ Node_var, /* rnode is value, lnode is array stuff */
Node_var_array, /* array is ptr to elements, asize num of
* eles */
Node_val, /* node is a value - type in flags */
/* Builtins subnode is explist to work on, proc is func to call */
Node_builtin,
/*
* pattern: conditional ',' conditional ; lnode of Node_line_range
* is the two conditionals (Node_cond_pair), other word (rnode place)
* is a flag indicating whether or not this range has been entered.
*/
Node_line_range,
/*
* boolean test of membership in array lnode is string-valued
* expression rnode is array name
*/
Node_in_array,
Node_func, /* lnode is param. list, rnode is body */
Node_func_call, /* lnode is name, rnode is argument list */
Node_cond_exp, /* lnode is conditonal, rnode is if_branches */
Node_regex,
/*70*/ Node_hashnode,
Node_ahash,
Node_NF,
Node_NR,
Node_FNR,
Node_FS,
Node_RS,
Node_FIELDWIDTHS,
Node_IGNORECASE,
Node_OFS,
Node_ORS,
Node_OFMT,
Node_CONVFMT,
Node_K_nextfile
} NODETYPE;
/*
* NOTE - this struct is a rather kludgey -- it is packed to minimize
* space usage, at the expense of cleanliness. Alter at own risk.
*/
typedef struct exp_node {
union {
struct {
union {
struct exp_node *lptr;
char *param_name;
long ll;
} l;
union {
struct exp_node *rptr;
struct exp_node *(*pptr) ();
Regexp *preg;
struct for_loop_header *hd;
struct exp_node **av;
int r_ent; /* range entered */
} r;
union {
char *name;
struct exp_node *extra;
long xl;
} x;
short number;
unsigned char reflags;
# define CASE 1
# define CONST 2
# define FS_DFLT 4
} nodep;
struct {
AWKNUM fltnum; /* this is here for optimal packing of
* the structure on many machines
*/
char *sp;
size_t slen;
unsigned char sref;
char idx;
} val;
struct {
struct exp_node *next;
char *name;
size_t length;
struct exp_node *value;
} hash;
#define hnext sub.hash.next
#define hname sub.hash.name
#define hlength sub.hash.length
#define hvalue sub.hash.value
struct {
struct exp_node *next;
struct exp_node *name;
struct exp_node *value;
} ahash;
#define ahnext sub.ahash.next
#define ahname sub.ahash.name
#define ahvalue sub.ahash.value
} sub;
NODETYPE type;
unsigned short flags;
# define MALLOC 1 /* can be free'd */
# define TEMP 2 /* should be free'd */
# define PERM 4 /* can't be free'd */
# define STRING 8 /* assigned as string */
# define STR 16 /* string value is current */
# define NUM 32 /* numeric value is current */
# define NUMBER 64 /* assigned as number */
# define MAYBE_NUM 128 /* user input: if NUMERIC then
* a NUMBER */
# define ARRAYMAXED 256 /* array is at max size */
char *vname; /* variable's name */
} NODE;
#define lnode sub.nodep.l.lptr
#define nextp sub.nodep.l.lptr
#define rnode sub.nodep.r.rptr
#define source_file sub.nodep.x.name
#define source_line sub.nodep.number
#define param_cnt sub.nodep.number
#define param sub.nodep.l.param_name
#define subnode lnode
#define proc sub.nodep.r.pptr
#define re_reg sub.nodep.r.preg
#define re_flags sub.nodep.reflags
#define re_text lnode
#define re_exp sub.nodep.x.extra
#define re_cnt sub.nodep.number
#define forsub lnode
#define forloop rnode->sub.nodep.r.hd
#define stptr sub.val.sp
#define stlen sub.val.slen
#define stref sub.val.sref
#define stfmt sub.val.idx
#define numbr sub.val.fltnum
#define var_value lnode
#define var_array sub.nodep.r.av
#define array_size sub.nodep.l.ll
#define table_size sub.nodep.x.xl
#define condpair lnode
#define triggered sub.nodep.r.r_ent
#ifdef DONTDEF
int primes[] = {31, 61, 127, 257, 509, 1021, 2053, 4099, 8191, 16381};
#endif
typedef struct for_loop_header {
NODE *init;
NODE *cond;
NODE *incr;
} FOR_LOOP_HEADER;
/* for "for(iggy in foo) {" */
struct search {
NODE *sym;
size_t idx;
NODE *bucket;
NODE *retval;
};
/* for faster input, bypass stdio */
typedef struct iobuf {
int fd;
char *buf;
char *off;
char *end;
size_t size; /* this will be determined by an fstat() call */
int cnt;
long secsiz;
int flag;
# define IOP_IS_TTY 1
# define IOP_IS_INTERNAL 2
# define IOP_NO_FREE 4
} IOBUF;
typedef void (*Func_ptr)();
/*
* structure used to dynamically maintain a linked-list of open files/pipes
*/
struct redirect {
unsigned int flag;
# define RED_FILE 1
# define RED_PIPE 2
# define RED_READ 4
# define RED_WRITE 8
# define RED_APPEND 16
# define RED_NOBUF 32
# define RED_USED 64
# define RED_EOF 128
char *value;
FILE *fp;
IOBUF *iop;
int pid;
int status;
struct redirect *prev;
struct redirect *next;
};
/* structure for our source, either a command line string or a source file */
struct src {
enum srctype { CMDLINE = 1, SOURCEFILE } stype;
char *val;
};
/* longjmp return codes, must be nonzero */
/* Continue means either for loop/while continue, or next input record */
#define TAG_CONTINUE 1
/* Break means either for/while break, or stop reading input */
#define TAG_BREAK 2
/* Return means return from a function call; leave value in ret_node */
#define TAG_RETURN 3
#ifndef INT_MAX
#define INT_MAX (~(1 << (sizeof (int) * 8 - 1)))
#endif
#ifndef LONG_MAX
#define LONG_MAX (~(1 << (sizeof (long) * 8 - 1)))
#endif
#ifndef ULONG_MAX
#define ULONG_MAX (~(unsigned long)0)
#endif
#ifndef LONG_MIN
#define LONG_MIN (-LONG_MAX - 1)
#endif
#define HUGE INT_MAX
/* -------------------------- External variables -------------------------- */
/* gawk builtin variables */
extern long NF;
extern long NR;
extern long FNR;
extern int IGNORECASE;
extern char *RS;
extern char *OFS;
extern int OFSlen;
extern char *ORS;
extern int ORSlen;
extern char *OFMT;
extern char *CONVFMT;
extern int CONVFMTidx;
extern int OFMTidx;
extern NODE *FS_node, *NF_node, *RS_node, *NR_node;
extern NODE *FILENAME_node, *OFS_node, *ORS_node, *OFMT_node;
extern NODE *CONVFMT_node;
extern NODE *FNR_node, *RLENGTH_node, *RSTART_node, *SUBSEP_node;
extern NODE *IGNORECASE_node;
extern NODE *FIELDWIDTHS_node;
extern NODE **stack_ptr;
extern NODE *Nnull_string;
extern NODE **fields_arr;
extern int sourceline;
extern char *source;
extern NODE *expression_value;
extern NODE *_t; /* used as temporary in tree_eval */
extern const char *myname;
extern NODE *nextfree;
extern int field0_valid;
extern int do_unix;
extern int do_posix;
extern int do_lint;
extern int in_begin_rule;
extern int in_end_rule;
/* ------------------------- Pseudo-functions ------------------------- */
#define is_identchar(c) (isalnum(c) || (c) == '_')
#ifndef MPROF
#define getnode(n) if (nextfree) n = nextfree, nextfree = nextfree->nextp;\
else n = more_nodes()
#define freenode(n) ((n)->nextp = nextfree, nextfree = (n))
#else
#define getnode(n) emalloc(n, NODE *, sizeof(NODE), "getnode")
#define freenode(n) free(n)
#endif
#ifdef DEBUG
#define tree_eval(t) r_tree_eval(t)
#define get_lhs(p, a) r_get_lhs((p), (a))
#undef freenode
#else
#define get_lhs(p, a) ((p)->type == Node_var ? (&(p)->var_value) : \
r_get_lhs((p), (a)))
#define tree_eval(t) (_t = (t),_t == NULL ? Nnull_string : \
(_t->type == Node_param_list ? r_tree_eval(_t) : \
(_t->type == Node_val ? _t : \
(_t->type == Node_var ? _t->var_value : \
r_tree_eval(_t)))))
#endif
#define make_number(x) mk_number((x), (unsigned int)(MALLOC|NUM|NUMBER))
#define tmp_number(x) mk_number((x), (unsigned int)(MALLOC|TEMP|NUM|NUMBER))
#define free_temp(n) do {if ((n)->flags&TEMP) { unref(n); }} while (0)
#define make_string(s,l) make_str_node((s), SZTC (l),0)
#define SCAN 1
#define ALREADY_MALLOCED 2
#define cant_happen() fatal("internal error line %d, file: %s", \
__LINE__, __FILE__);
#if defined(__STDC__) && !defined(NO_TOKEN_PASTING)
#define emalloc(var,ty,x,str) (void)((var=(ty)malloc((MALLOC_ARG_T)(x))) ||\
(fatal("%s: %s: can't allocate memory (%s)",\
(str), #var, strerror(errno)),0))
#define erealloc(var,ty,x,str) (void)((var=(ty)realloc((char *)var,\
(MALLOC_ARG_T)(x))) ||\
(fatal("%s: %s: can't allocate memory (%s)",\
(str), #var, strerror(errno)),0))
#else /* __STDC__ */
#define emalloc(var,ty,x,str) (void)((var=(ty)malloc((MALLOC_ARG_T)(x))) ||\
(fatal("%s: %s: can't allocate memory (%s)",\
(str), "var", strerror(errno)),0))
#define erealloc(var,ty,x,str) (void)((var=(ty)realloc((char *)var,\
(MALLOC_ARG_T)(x))) ||\
(fatal("%s: %s: can't allocate memory (%s)",\
(str), "var", strerror(errno)),0))
#endif /* __STDC__ */
#ifdef DEBUG
#define force_number r_force_number
#define force_string r_force_string
#else /* not DEBUG */
#ifdef lint
extern AWKNUM force_number();
#endif
#ifdef MSDOS
extern double _msc51bug;
#define force_number(n) (_msc51bug=(_t = (n),(_t->flags & NUM) ? _t->numbr : r_force_number(_t)))
#else /* not MSDOS */
#define force_number(n) (_t = (n),(_t->flags & NUM) ? _t->numbr : r_force_number(_t))
#endif /* MSDOS */
#define force_string(s) (_t = (s),(_t->flags & STR) ? _t : r_force_string(_t))
#endif /* not DEBUG */
#define STREQ(a,b) (*(a) == *(b) && strcmp((a), (b)) == 0)
#define STREQN(a,b,n) ((n)&& *(a)== *(b) && strncmp((a), (b), SZTC (n)) == 0)
/* ------------- Function prototypes or defs (as appropriate) ------------- */
/* array.c */
extern NODE *concat_exp P((NODE *tree));
extern void assoc_clear P((NODE *symbol));
extern unsigned int hash P((const char *s, size_t len, unsigned long hsize));
extern int in_array P((NODE *symbol, NODE *subs));
extern NODE **assoc_lookup P((NODE *symbol, NODE *subs));
extern void do_delete P((NODE *symbol, NODE *tree));
extern void assoc_scan P((NODE *symbol, struct search *lookat));
extern void assoc_next P((struct search *lookat));
/* awk.tab.c */
extern char *tokexpand P((void));
extern char nextc P((void));
extern NODE *node P((NODE *left, NODETYPE op, NODE *right));
extern NODE *install P((char *name, NODE *value));
extern NODE *lookup P((const char *name));
extern NODE *variable P((char *name, int can_free));
extern int yyparse P((void));
/* builtin.c */
extern NODE *do_exp P((NODE *tree));
extern NODE *do_index P((NODE *tree));
extern NODE *do_int P((NODE *tree));
extern NODE *do_length P((NODE *tree));
extern NODE *do_log P((NODE *tree));
extern NODE *do_sprintf P((NODE *tree));
extern void do_printf P((NODE *tree));
extern void print_simple P((NODE *tree, FILE *fp));
extern NODE *do_sqrt P((NODE *tree));
extern NODE *do_substr P((NODE *tree));
extern NODE *do_strftime P((NODE *tree));
extern NODE *do_systime P((NODE *tree));
extern NODE *do_system P((NODE *tree));
extern void do_print P((NODE *tree));
extern NODE *do_tolower P((NODE *tree));
extern NODE *do_toupper P((NODE *tree));
extern NODE *do_atan2 P((NODE *tree));
extern NODE *do_sin P((NODE *tree));
extern NODE *do_cos P((NODE *tree));
extern NODE *do_rand P((NODE *tree));
extern NODE *do_srand P((NODE *tree));
extern NODE *do_match P((NODE *tree));
extern NODE *do_gsub P((NODE *tree));
extern NODE *do_sub P((NODE *tree));
/* eval.c */
extern int interpret P((NODE *volatile tree));
extern NODE *r_tree_eval P((NODE *tree));
extern int cmp_nodes P((NODE *t1, NODE *t2));
extern NODE **r_get_lhs P((NODE *ptr, Func_ptr *assign));
extern void set_IGNORECASE P((void));
void set_OFS P((void));
void set_ORS P((void));
void set_OFMT P((void));
void set_CONVFMT P((void));
/* field.c */
extern void init_fields P((void));
extern void set_record P((char *buf, int cnt, int freeold));
extern void reset_record P((void));
extern void set_NF P((void));
extern NODE **get_field P((int num, Func_ptr *assign));
extern NODE *do_split P((NODE *tree));
extern void set_FS P((void));
extern void set_RS P((void));
extern void set_FIELDWIDTHS P((void));
/* io.c */
extern void set_FNR P((void));
extern void set_NR P((void));
extern void do_input P((void));
extern struct redirect *redirect P((NODE *tree, int *errflg));
extern NODE *do_close P((NODE *tree));
extern int flush_io P((void));
extern int close_io P((void));
extern int devopen P((const char *name, const char *mode));
extern int pathopen P((const char *file));
extern NODE *do_getline P((NODE *tree));
extern void do_nextfile P((void));
/* iop.c */
extern int optimal_bufsize P((int fd));
extern IOBUF *iop_alloc P((int fd));
extern int get_a_record P((char **out, IOBUF *iop, int rs, int *errcode));
/* main.c */
extern int main P((int argc, char **argv));
extern Regexp *mk_re_parse P((char *s, int ignorecase));
extern void load_environ P((void));
extern char *arg_assign P((char *arg));
extern SIGTYPE catchsig P((int sig, int code));
/* msg.c */
extern void err P((const char *s, const char *emsg, va_list argp));
#if _MSC_VER == 510
extern void msg P((va_list va_alist, ...));
extern void warning P((va_list va_alist, ...));
extern void fatal P((va_list va_alist, ...));
#else
extern void msg ();
extern void warning ();
extern void fatal ();
#endif
/* node.c */
extern AWKNUM r_force_number P((NODE *n));
extern NODE *r_force_string P((NODE *s));
extern NODE *dupnode P((NODE *n));
extern NODE *mk_number P((AWKNUM x, unsigned int flags));
extern NODE *make_str_node P((char *s, size_t len, int scan ));
extern NODE *tmp_string P((char *s, size_t len ));
extern NODE *more_nodes P((void));
#ifdef DEBUG
extern void freenode P((NODE *it));
#endif
extern void unref P((NODE *tmp));
extern int parse_escape P((char **string_ptr));
/* re.c */
extern Regexp *make_regexp P((char *s, size_t len, int ignorecase, int dfa));
extern int research P((Regexp *rp, char *str, int start,
size_t len, int need_start));
extern void refree P((Regexp *rp));
extern void reg_error P((const char *s));
extern Regexp *re_update P((NODE *t));
extern void resyntax P((int syntax));
extern void resetup P((void));
/* strcase.c */
extern int strcasecmp P((const char *s1, const char *s2));
extern int strncasecmp P((const char *s1, const char *s2, register size_t n));
#ifdef atarist
/* atari/tmpnam.c */
extern char *tmpnam P((char *buf));
extern char *tempnam P((const char *path, const char *base));
#endif
/* Figure out what '\a' really is. */
#ifdef __STDC__
#define BELL '\a' /* sure makes life easy, don't it? */
#else
# if 'z' - 'a' == 25 /* ascii */
# if 'a' != 97 /* machine is dumb enough to use mark parity */
# define BELL '\207'
# else
# define BELL '\07'
# endif
# else
# define BELL '\057'
# endif
#endif
extern char casetable[]; /* for case-independent regexp matching */
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