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	grep.h - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	grep.h (2224B)
	---
	1 #include <u.h>
	2 #include <libc.h>
	3 #include <bio.h>
	4
	5 #ifndef EXTERN
	6 #define EXTERN extern
	7 #endif
	8
	9 typedef struct Re Re;
	10 typedef struct Re2 Re2;
	11 typedef struct State State;
	12
	13 struct State
	14 {
	15 int count;
	16 int match;
	17 Re** re;
	18 State* linkleft;
	19 State* linkright;
	20 State* next[256];
	21 };
	22 struct Re2
	23 {
	24 Re* beg;
	25 Re* end;
	26 };
	27 struct Re
	28 {
	29 uchar type;
	30 ushort gen;
	31 union
	32 {
	33 Re* alt; /* Talt */
	34 Re** cases; /* case */
	35 struct /* class */
	36 {
	37 Rune lo;
	38 Rune hi;
	39 } x;
	40 Rune val; /* char */
	41 } u;
	42 Re* next;
	43 };
	44
	45 enum
	46 {
	47 Talt = 1,
	48 Tbegin,
	49 Tcase,
	50 Tclass,
	51 Tend,
	52 Tor,
	53
	54 Caselim = 7,
	55 Nhunk = 1<<16,
	56 Cbegin = 0x10000,
	57 Flshcnt = (1<<9)-1,
	58
	59 Cflag = 1<<0,
	60 Hflag = 1<<1,
	61 Iflag = 1<<2,
	62 Llflag = 1<<3,
	63 LLflag = 1<<4,
	64 Nflag = 1<<5,
	65 Sflag = 1<<6,
	66 Vflag = 1<<7,
	67 Bflag = 1<<8
	68 };
	69
	70 EXTERN union
	71 {
	72 char string[16*1024];
	73 struct
	74 {
	75 /*
	76 * if a line requires multiple reads, we keep shifting
	77 * buf down into pre and then do another read into
	78 * buf. so you'll get the last 16-32k of the matching l…
	79 * if h were smaller than buf you'd get a suffix of the
	80 * line with a hole cut out.
	81 */
	82 uchar pre[161024]; / to save to previous…
	83 uchar buf[161024]; / input buffer */
	84 } u;
	85 } u;
	86
	87 EXTERN char *filename;
	88 EXTERN Biobuf bout;
	89 EXTERN char flags[256];
	90 EXTERN Re** follow;
	91 EXTERN ushort gen;
	92 EXTERN char* input;
	93 EXTERN long lineno;
	94 EXTERN int literal;
	95 EXTERN int matched;
	96 EXTERN long maxfollow;
	97 EXTERN long nfollow;
	98 EXTERN int peekc;
	99 EXTERN Biobuf* rein;
	100 EXTERN State* state0;
	101 EXTERN Re2 topre;
	102
	103 extern Re* addcase(Re*);
	104 extern void appendnext(Re, Re);
	105 extern void error(char*);
	106 extern int fcmp(const void, const void); /* (Re*…
	107 extern void fol1(Re*, int);
	108 extern int getrec(void);
	109 extern void increment(State*, int);
	110 #define initstate grepinitstate
	111 extern State* initstate(Re*);
	112 extern void* mal(int);
	113 extern void patchnext(Re, Re);
	114 extern Re* ral(int);
	115 extern Re2 re2cat(Re2, Re2);
	116 extern Re2 re2class(char*);
	117 extern Re2 re2or(Re2, Re2);
	118 extern Re2 re2char(int, int);
	119 extern Re2 re2star(Re2);
	120 extern State* sal(int);
	121 extern int search(char*, int);
	122 extern void str2top(char*);
	123 extern int yyparse(void);
	124 extern void reprint(char, Re);
	125 extern void yyerror(char*, ...);