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Filename : push.c
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/* Generated by re2c */
#line 1 "c/state/push.re"
// re2c $INPUT -o $OUTPUT -f
#include <assert.h>
#include <stdio.h>
#include <string.h>

#define DEBUG    0
#define LOG(...) if (DEBUG) fprintf(stderr, __VA_ARGS__);
#define BUFSIZE  10

typedef struct {
    FILE *file;
    char buf[BUFSIZE + 1], *lim, *cur, *mar, *tok;
    unsigned yyaccept;
    int state;
} Input;

static void init(Input *in, FILE *f)
{
    in->file = f;
    in->cur = in->mar = in->tok = in->lim = in->buf + BUFSIZE;
    in->lim[0] = 0; // append sentinel symbol
    in->yyaccept = 0;
    in->state = -1;
}

typedef enum {END, READY, WAITING, BAD_PACKET, BIG_PACKET} Status;

static Status fill(Input *in)
{
    const size_t shift = in->tok - in->buf;
    const size_t free = BUFSIZE - (in->lim - in->tok);

    if (free < 1) return BIG_PACKET;

    memmove(in->buf, in->tok, BUFSIZE - shift);
    in->lim -= shift;
    in->cur -= shift;
    in->mar -= shift;
    in->tok -= shift;

    const size_t read = fread(in->lim, 1, free, in->file);
    in->lim += read;
    in->lim[0] = 0; // append sentinel symbol

    return READY;
}

static Status lex(Input *in, unsigned int *recv)
{
    char yych;
    
#line 55 "c/state/push.c"
switch (in->state) {
default:
	goto yy0;
case 0:
	if (in->lim <= in->cur) goto yy11;
	goto yyFillLabel0;
case 1:
	if (in->lim <= in->cur) goto yy4;
	goto yyFillLabel1;
case 2:
	if (in->lim <= in->cur) goto yy10;
	goto yyFillLabel2;
}
#line 51 "c/state/push.re"

loop:
    in->tok = in->cur;
    
#line 74 "c/state/push.c"

yy0:
yyFillLabel0:
	yych = *in->cur;
	switch (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':	goto yy5;
	default:
		if (in->lim <= in->cur) {
			in->state = 0;
			return WAITING;
		}
		goto yy3;
	}
yy3:
	++in->cur;
yy4:
#line 67 "c/state/push.re"
	{ return BAD_PACKET; }
#line 118 "c/state/push.c"
yy5:
	in->mar = ++in->cur;
yyFillLabel1:
	yych = *in->cur;
	switch (yych) {
	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':	goto yy8;
	default:
		if (in->lim <= in->cur) {
			in->state = 1;
			return WAITING;
		}
		goto yy4;
	}
yy6:
	++in->cur;
#line 69 "c/state/push.re"
	{ *recv = *recv + 1; goto loop; }
#line 162 "c/state/push.c"
yy8:
	++in->cur;
yyFillLabel2:
	yych = *in->cur;
	switch (yych) {
	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':	goto yy8;
	default:
		if (in->lim <= in->cur) {
			in->state = 2;
			return WAITING;
		}
		goto yy10;
	}
yy10:
	in->cur = in->mar;
	goto yy4;
yy11:
#line 68 "c/state/push.re"
	{ return END; }
#line 208 "c/state/push.c"
#line 70 "c/state/push.re"

}

void test(const char **packets, Status status)
{
    const char *fname = "pipe";
    FILE *fw = fopen(fname, "w");
    FILE *fr = fopen(fname, "r");
    setvbuf(fw, NULL, _IONBF, 0);
    setvbuf(fr, NULL, _IONBF, 0);

    Input in;
    init(&in, fr);
    Status st;
    unsigned int send = 0, recv = 0;

    for (;;) {
        st = lex(&in, &recv);
        if (st == END) {
            LOG("done: got %u packets\n", recv);
            break;
        } else if (st == WAITING) {
            LOG("waiting...\n");
            if (*packets) {
                LOG("sent packet %u\n", send);
                fprintf(fw, "%s", *packets++);
                ++send;
            }
            st = fill(&in);
            LOG("queue: '%s'\n", in.buf);
            if (st == BIG_PACKET) {
                LOG("error: packet too big\n");
                break;
            }
            assert(st == READY);
        } else {
            assert(st == BAD_PACKET);
            LOG("error: ill-formed packet\n");
            break;
        }
    }

    LOG("\n");
    assert(st == status);
    if (st == END) assert(recv == send);

    fclose(fw);
    fclose(fr);
    remove(fname);
}

int main()
{
    const char *packets1[] = {0};
    const char *packets2[] = {"zero;", "one;", "two;", "three;", "four;", 0};
    const char *packets3[] = {"zer0;", 0};
    const char *packets4[] = {"goooooooooogle;", 0};

    test(packets1, END);
    test(packets2, END);
    test(packets3, BAD_PACKET);
    test(packets4, BIG_PACKET);

    return 0;
}