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105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
#include "parse.h"
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size_t bs_skip(struct bytestream* bs, size_t len) {
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size_t n;
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if (bs->cur >= bs->max)
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return 0;
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n = bs->max - bs->cur;
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if (len > n) {
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bs->max = 0; // set error
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bs->cur = 1;
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return 0;
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}
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switch (bs->type) {
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case MEMBUF:
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bs->cur += len;
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break;
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case IOBUF:
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return buffer_seek(bs->u.b, len);
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case BSTREAM:
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return bs_skip(bs->u.bs, len);
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}
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return len;
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}
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#ifdef UNITTEST
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#include <assert.h>
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#include <signal.h>
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#undef UNITTEST
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#include "buffer/bs_init_membuf.c"
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#include "buffer/bs_err.c"
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#include "buffer/bs_get.c"
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#include "buffer/buffer_getc.c"
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#include "buffer/buffer_seek.c"
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#include "buffer/buffer_feed.c"
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#include "buffer/buffer_stubborn2.c"
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#include "buffer/bs_init_iobuf.c"
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#include "open/open_read.c"
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#include "buffer/prs_readblob.c"
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#include "buffer/buffer_get.c"
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#include "buffer/bs_capacityassert.c"
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#include "byte/byte_copy.c"
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#include "buffer/buffer_init.c"
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int main() {
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struct bytestream bs;
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// test basic functionality inside buffer with known length
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bs_init_membuf(&bs, "fnord\n", 7);
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assert(bs_skip(&bs, 0) == 0);
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assert(bs_err(&bs) == 0);
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assert(bs_skip(&bs, 5) == 5);
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assert(bs_err(&bs) == 0);
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assert(bs_get(&bs) == '\n');
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assert(bs_skip(&bs, 100) == 0);
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assert(bs_err(&bs));
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// test basic functionality when the backend is a file
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int fd = open_read("GNUmakefile");
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assert(fd != -1);
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unsigned char iobuf[42];
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buffer b = BUFFER_INIT(read, fd, iobuf+32, 10);
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bs_init_iobuf(&bs, &b);
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assert(bs_skip(&bs, 100) == 100);
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assert(prs_readblob(&bs, iobuf, 10) == 10);
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assert(pread(fd, iobuf+10, 10, 100) == 10);
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assert(!memcmp(iobuf, iobuf+10, 10));
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// test basic functionality when backend is non-seekable file
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int pipes[2];
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assert(pipe(pipes)==0);
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int r=fork();
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assert(r!=-1);
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if (r==0) {
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lseek(fd, 0, SEEK_SET);
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for (;;) {
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r=read(fd, iobuf, 32);
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if (r <= 0) return 0;
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write(pipes[1], iobuf, 32);
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}
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}
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buffer_init(&b, read, pipes[0], iobuf+32, 10);
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bs_init_iobuf(&bs, &b);
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assert(bs_skip(&bs, 20) == 20);
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assert(prs_readblob(&bs, iobuf, 10) == 10);
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assert(pread(fd, iobuf+10, 10, 20) == 10);
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assert(!memcmp(iobuf, iobuf+10, 10));
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kill(r, 15);
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close(fd);
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}
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#endif
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