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View File Name : 18_push_model.if.c

/* Generated by re2c */
#include <stdio.h>
#include <string.h>

#define YYMAXFILL 1

static const size_t SIZE = 4096;

struct input_t {
    char buf[SIZE + YYMAXFILL];
    char *lim;
    char *cur;
    char *tok;
    int state;
    unsigned need;
    unsigned yyaccept;
    char yych;

    input_t()
        : buf()
        , lim(buf + SIZE)
        , cur(lim)
        , tok(lim)
        , state(-1)
        , need(0)
        , yyaccept(0)
        , yych(0)
    {}

    bool fill()
    {
        const size_t free = tok - buf;
        if (free < need) return false;

        memmove(buf, tok, buf - tok + SIZE);
        lim -= free;
        cur -= free;
        tok -= free;
        lim += fread(lim, 1, free, stdin);
        if (lim < buf + SIZE) {
            memset(lim, 0, YYMAXFILL);
            lim += YYMAXFILL;
        }
        return true;
    }
};

enum status_t { OK, FAIL, NEED_MORE_INPUT };

static status_t lex(input_t &in, unsigned &words)
{
#   define YYGETSTATE()  in.state
#   define YYSETSTATE(s) in.state = s
#   define YYFILL(n)     do { in.need = n; return NEED_MORE_INPUT; } while (0)
    switch (YYGETSTATE()) {
default: goto yy0;
case 0: goto yyFillLabel0;
case 1: goto yyFillLabel1;
case 2: goto yyFillLabel2;
}

loop:
    in.tok = in.cur;
    

yy0:
	YYSETSTATE(0);
	if (in.lim <= in.cur) YYFILL(1);
yyFillLabel0:
	in.yych = *in.cur;
	switch (in.yych) {
	case 0x00:	goto yy2;
	case '\n':
	case ' ':	goto yy6;
	case 'A':
	case 'B':
	case 'C':
	case 'D':
	case 'E':
	case 'F':
	case 'G':
	case 'H':
	case 'I':
	case 'J':
	case 'K':
	case 'L':
	case 'M':
	case 'N':
	case 'O':
	case 'P':
	case 'Q':
	case 'R':
	case 'S':
	case 'T':
	case 'U':
	case 'V':
	case 'W':
	case 'X':
	case 'Y':
	case 'Z':
	case 'a':
	case 'b':
	case 'c':
	case 'd':
	case 'e':
	case 'f':
	case 'g':
	case 'h':
	case 'i':
	case 'j':
	case 'k':
	case 'l':
	case 'm':
	case 'n':
	case 'o':
	case 'p':
	case 'q':
	case 'r':
	case 's':
	case 't':
	case 'u':
	case 'v':
	case 'w':
	case 'x':
	case 'y':
	case 'z':	goto yy9;
	default:	goto yy4;
	}
yy2:
	++in.cur;
	{ return OK; }
yy4:
	++in.cur;
	{ return FAIL; }
yy6:
	++in.cur;
	YYSETSTATE(1);
	if (in.lim <= in.cur) YYFILL(1);
yyFillLabel1:
	in.yych = *in.cur;
	switch (in.yych) {
	case '\n':
	case ' ':	goto yy6;
	default:	goto yy8;
	}
yy8:
	{ goto loop; }
yy9:
	++in.cur;
	YYSETSTATE(2);
	if (in.lim <= in.cur) YYFILL(1);
yyFillLabel2:
	in.yych = *in.cur;
	switch (in.yych) {
	case 'A':
	case 'B':
	case 'C':
	case 'D':
	case 'E':
	case 'F':
	case 'G':
	case 'H':
	case 'I':
	case 'J':
	case 'K':
	case 'L':
	case 'M':
	case 'N':
	case 'O':
	case 'P':
	case 'Q':
	case 'R':
	case 'S':
	case 'T':
	case 'U':
	case 'V':
	case 'W':
	case 'X':
	case 'Y':
	case 'Z':
	case 'a':
	case 'b':
	case 'c':
	case 'd':
	case 'e':
	case 'f':
	case 'g':
	case 'h':
	case 'i':
	case 'j':
	case 'k':
	case 'l':
	case 'm':
	case 'n':
	case 'o':
	case 'p':
	case 'q':
	case 'r':
	case 's':
	case 't':
	case 'u':
	case 'v':
	case 'w':
	case 'x':
	case 'y':
	case 'z':	goto yy9;
	default:	goto yy11;
	}
yy11:
	{ ++words; goto loop; }

}

int main()
{
    input_t in;
    unsigned words = 0;

    while (true) {
        const status_t st = lex(in, words);

        // end of input: print result
        if (st == OK) {
            printf("\nword count: %u\n", words);
            break;

        // unexpected error: abort
        } else if (st == FAIL) {
            printf("\nerror\n");
            return 1;

        // get more input and continue
        } else if (!in.fill()) {
            printf("\nsmall buffer\n");
            return 2;
        }
    }

    return 0;
}