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118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
#include "parse.h"
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unsigned char bs_get(struct bytestream* bs) {
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unsigned char r;
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char c;
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if (bs->cur>=bs->max) { // EOF or already error state?
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bs->max=0; // signal error
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bs->cur=1;
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return 0; // return 0
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}
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switch (bs->type) {
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case MEMBUF:
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r=bs->u.base[bs->cur];
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break;
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case IOBUF:
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{
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int ret=buffer_getc(bs->u.b, &c);
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if (ret==1) {
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r=c;
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} else {
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bs->max=0;
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bs->cur=1;
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return 0;
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}
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}
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break;
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case BSTREAM:
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r=bs_get(bs->u.bs);
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break;
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default:
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r=0; // cannot happen
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}
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++bs->cur;
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return r;
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}
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#ifdef UNITTEST
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#include <assert.h>
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#undef UNITTEST
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#include "buffer/bs_err.c"
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#include "buffer/buffer_init_staticcontents.c"
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#include "buffer/bs_init_iobuf.c"
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#include "buffer/bs_init_iobuf_size.c"
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#include "buffer/buffer_getc.c"
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#include "buffer/buffer_feed.c"
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#include "buffer/buffer_stubborn2.c"
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int main() {
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struct bytestream bs = BS_FROM_MEMBUF("fnord\nx", 6);
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int i;
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char buf[7];
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/* first test: membuf.
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* See if we get all the bytes we put in and then error is signaled */
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for (i=0; i<6; ++i) {
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buf[i] = bs_get(&bs);
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assert(buf[i] == "fnord\n"[i]);
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assert(!bs_err(&bs));
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}
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buf[6] = bs_get(&bs);
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/* We put an x there in memory.
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* If the bytestream range check failed, we'll get 'x', otherwise 0. */
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assert(buf[6] == 0);
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assert(bs_err(&bs));
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/* second test: iobuf with no limit. Otherwise the same. */
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struct buffer b;
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buffer_init_staticcontents(&b, "fnord\nx", 6); // this will let us read 6 bytes
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bs_init_iobuf(&bs, &b);
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for (i=0; i<6; ++i) {
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buf[i] = bs_get(&bs);
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assert(buf[i] == "fnord\n"[i]);
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assert(!bs_err(&bs));
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}
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buf[6] = bs_get(&bs);
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/* We put an x there in memory.
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* If the bytestream range check failed, we'll get 'x', otherwise 0. */
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assert(buf[6] == 0);
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assert(bs_err(&bs));
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/* third test: iobuf with limit. Otherwise the same. */
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buffer_init_staticcontents(&b, "fnord\nx", 7); // this will let us read 7 bytes
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bs_init_iobuf_size(&bs, &b, 6); // but we tell bytestream the limit is 6
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for (i=0; i<6; ++i) {
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buf[i] = bs_get(&bs);
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assert(buf[i] == "fnord\n"[i]);
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assert(!bs_err(&bs));
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}
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buf[6] = bs_get(&bs);
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/* We put an x there in the backing buffer.
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* If the bytestream range check failed, we'll get 'x', otherwise 0. */
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assert(buf[6] == 0);
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assert(bs_err(&bs));
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/* fourth test: iobuf with EOF */
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buffer_init_staticcontents(&b, "fnord\nx", 6);
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bs_init_iobuf(&bs, &b); // bytestream has no limit but will hit EOF in backing buffer
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for (i=0; i<6; ++i) {
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buf[i] = bs_get(&bs);
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assert(buf[i] == "fnord\n"[i]);
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assert(!bs_err(&bs));
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}
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buf[6] = bs_get(&bs);
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/* We did not give the bytestream a limit, but the buffer should
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* refuse to return more. */
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assert(buf[6] == 0);
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assert(bs_err(&bs));
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}
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#endif
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