extern char *record; /* points to $0 */
extern int lineno; /* line number in awk program */
extern char *exitstatus; /* exit status string */
extern int donefld; /* 1 if record broken into fields */
extern int donerec; /* 1 if record is valid (no fld has changed */
extern char inputFS[]; /* FS at time of input, for field splitting */
extern int dbg;
extern char *patbeg; /* beginning of pattern matched */
extern int patlen; /* length of pattern matched. set in b.c */
/* Cell: all information about a variable or constant */
typedef struct Cell {
uchar ctype; /* OCELL, OBOOL, OJUMP, etc. */
uchar csub; /* CCON, CTEMP, CFLD, etc. */
char *nval; /* name, for variables only */
char *sval; /* string value */
Awkfloat fval; /* value as number */
int tval; /* type info: STR|NUM|ARR|FCN|FLD|CON|DONTFREE */
struct Cell *cnext; /* ptr to next if chained */
} Cell;
typedef struct Array { /* symbol table array */
int nelemt; /* elements in table right now */
int size; /* size of tab */
Cell **tab; /* hash table pointers */
} Array;
#define NSYMTAB 50 /* initial size of a symbol table */
extern Array *symtab;
/* Cell.tval values: */
#define NUM 01 /* number value is valid */
#define STR 02 /* string value is valid */
#define DONTFREE 04 /* string space is not freeable */
#define CON 010 /* this is a constant */
#define ARR 020 /* this is an array */
#define FCN 040 /* this is a function name */
#define FLD 0100 /* this is a field $1, $2, ... */
#define REC 0200 /* this is $0 */
/* Node: parse tree is made of nodes, with Cell's at bottom */
typedef struct Node {
int ntype;
struct Node *nnext;
int lineno;
int nobj;
struct Node *narg[1]; /* variable: actual size set by calling malloc */
} Node;
