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#include "parse.h"
unsigned char bs_peek(struct bytestream* bs) {
unsigned char r;
char c;
if (bs->cur>=bs->max) { // EOF or already error state?
bs->max=0; // signal error
bs->cur=1;
return 0; // return 0
}
switch (bs->type) {
case MEMBUF:
r=bs->u.base[bs->cur];
break;
case IOBUF:
{
int ret=buffer_peekc(bs->u.b, &c);
if (ret==1) {
r=c;
} else {
bs->max=0;
bs->cur=1;
return 0;
}
}
break;
case BSTREAM:
r=bs_peek(bs->u.bs);
break;
default:
r=0; // cannot happen
}
return r;
}
#ifdef UNITTEST
#include <assert.h>
#undef UNITTEST
#include "buffer/bs_err.c"
#include "buffer/bs_get.c"
#include "buffer/buffer_init_staticcontents.c"
#include "buffer/bs_init_iobuf.c"
#include "buffer/bs_init_iobuf_size.c"
#include "buffer/buffer_peekc.c"
#include "buffer/buffer_getc.c"
#include "buffer/buffer_feed.c"
#include "buffer/buffer_stubborn2.c"
int main() {
struct bytestream bs = BS_FROM_MEMBUF("fx", 1);
/* first test: membuf.
* See if we get all the bytes we put in and then error is signaled */
assert(bs_peek(&bs) == 'f');
assert(bs_peek(&bs) == 'f');
assert(!bs_err(&bs));
assert(bs_get(&bs) == 'f');
assert(!bs_err(&bs));
assert(bs_peek(&bs) == 0);
assert(bs_err(&bs));
/* second test: iobuf with no limit. Otherwise the same. */
struct buffer b;
buffer_init_staticcontents(&b, "fx", 1);
bs_init_iobuf(&bs, &b);
assert(bs_peek(&bs) == 'f');
assert(bs_peek(&bs) == 'f');
assert(!bs_err(&bs));
assert(bs_get(&bs) == 'f');
assert(!bs_err(&bs));
assert(bs_peek(&bs) == 0);
assert(bs_err(&bs));
/* third test: iobuf with limit. Otherwise the same. */
buffer_init_staticcontents(&b, "fx", 2);
bs_init_iobuf_size(&bs, &b, 1);
assert(bs_peek(&bs) == 'f');
assert(bs_peek(&bs) == 'f');
assert(!bs_err(&bs));
assert(bs_get(&bs) == 'f');
assert(!bs_err(&bs));
assert(bs_peek(&bs) == 0);
assert(bs_err(&bs));
/* fourth test: iobuf with EOF */
buffer_init_staticcontents(&b, "fx", 1);
bs_init_iobuf(&bs, &b); // bytestream has no limit but will hit EOF in backing buffer
assert(bs_peek(&bs) == 'f');
assert(bs_peek(&bs) == 'f');
assert(!bs_err(&bs));
assert(bs_get(&bs) == 'f');
assert(!bs_err(&bs));
assert(bs_peek(&bs) == 0);
assert(bs_err(&bs));
return 0;
}
#endif
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