acl/lib_acl/samples/vstream_fseek/main.cpp

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2014-11-19 00:25:21 +08:00
// vstream_fseek.cpp : <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̨Ӧ<CCA8>ó<EFBFBD><C3B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ㡣
//
#include "lib_acl.h"
#include <assert.h>
int main(int argc acl_unused, char *argv[] acl_unused)
{
ACL_VSTREAM *fp;
char buf[4096];
int i, n;
acl_off_t off, off2;
struct acl_stat sbuf;
fp = acl_vstream_fopen("test.txt", O_RDWR | O_CREAT, 0600, 4096);
assert(fp);
if (acl_fstat(ACL_VSTREAM_FILE(fp), &sbuf) < 0)
printf("fstat file error\r\n");
else
printf("fstat file's size=%d\r\n", (int) sbuf.st_size);
memset(buf, 'X', sizeof(buf));
for (i = 0; i < 10; i++) {
acl_vstream_writen(fp, buf, sizeof(buf));
printf("after write %d, offset=%d, sys_offset=%d\r\n",
(int) sizeof(buf), (int) fp->offset, (int) fp->sys_offset);
}
n = acl_vstream_read(fp, buf, sizeof(buf) - 1);
if (n == ACL_VSTREAM_EOF)
printf("ok(%d): read ACL_VSTREAM_EOF, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
else {
printf("error(%d): read n=%d\r\n", __LINE__, n);
goto END;
}
off = acl_vstream_fseek(fp, 0, SEEK_SET);
if (off == -1) {
printf("error(%d): fseek error\r\n", __LINE__);
goto END;
}
printf("ok(%d): after seek 0, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
n = acl_vstream_read(fp, buf, sizeof(buf));
if (n == ACL_VSTREAM_EOF) {
printf("error(%d): readr\r\n", __LINE__);
goto END;
}
printf("ok(%d): after read %d, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) sizeof(buf), (int) fp->offset, (int) fp->sys_offset);
off = acl_vstream_fseek(fp, 100, SEEK_SET);
if (off != 100) {
printf("error(%d): off(%d) != 100\r\n", __LINE__, (int) off);
goto END;
} else
printf("ok(%d): after seek 100, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off2 = acl_vstream_ftell(fp);
if (off2 != off) {
printf("error, off: %lld != ftell(%lld)\r\n", off, off2);
goto END;
} else
printf(">>>ftell: %lld ok\r\n", off2);
off = acl_vstream_fseek(fp, 4096, SEEK_SET);
if (off != 4096) {
printf("error(%d): off(%d) != 4096\r\n", __LINE__, (int) off);
goto END;
} else
printf("ok(%d): after seek 4096, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off = acl_vstream_fseek(fp, 5096, SEEK_SET);
if (off != 5096) {
printf("error(%d): off(%d) != 5096\r\n", __LINE__, (int) off);
goto END;
} else
printf("ok(%d): after seek 5096, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off = acl_vstream_fseek(fp, 8191, SEEK_SET);
if (off != 8191) {
printf("error(%d): off(%d) != 8191\r\n", __LINE__, (int) off);
goto END;
} else
printf("ok(%d): after seek 8191, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off = acl_vstream_fseek(fp, 8192, SEEK_SET);
if (off != 8192) {
printf("error(%d): off(%d) != 8192\r\n", __LINE__, (int) off);
goto END;
} else
printf("ok(%d): after seek 8192, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off = acl_vstream_fseek(fp, 8193, SEEK_SET);
if (off != 8193) {
printf("error(%d): off(%d) != 8193\r\n", __LINE__, (int) off);
goto END;
} else
printf("ok(%d): after seek 8193, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
// ϵ<>ж<EFBFBD>
printf("%d>>>begin check: offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off = acl_vstream_fseek(fp, 100, SEEK_SET);
if (off != 100) {
printf("error(%d): off(%d) != 100\r\n", __LINE__, (int) off);
goto END;
} else
printf("ok(%d): after seek 100, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
acl_vstream_read(fp, buf, 100);
printf("ok(%d): after read 100, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off = acl_vstream_fseek(fp, 100, SEEK_SET);
if (off != 100) {
printf("error(%d): off(%d) != 100\r\n", __LINE__, (int) off);
goto END;
} else
printf("ok(%d): after seek 100, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off = acl_vstream_fseek(fp, 200, SEEK_SET);
if (off != 200) {
printf("error(%d): off(%d) != 200\r\n", __LINE__, (int) off);
goto END;
} else printf("ok(%d): after seek 200, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
acl_vstream_read(fp, buf, 100);
printf("ok(%d): after read 100, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off = acl_vstream_fseek(fp, 300, SEEK_SET);
if (off != 300) {
printf("error(%d): off(%d) != 300\r\n", __LINE__, (int) off);
goto END;
} else
printf("ok(%d): after seek 300, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
acl_vstream_read(fp, buf, 10);
printf("ok(%d): after read 10, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
acl_vstream_writen(fp, "hello", strlen("hello"));
printf("ok(%d): after write 'hello', offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
acl_vstream_writen(fp, "world", strlen("world"));
printf("ok(%d): after write 'world', offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off = acl_vstream_fseek(fp, 8190, SEEK_SET);
if (off != 8190) {
printf("error(%d): off(%d) != 8190\r\n", __LINE__, (int) off);
goto END;
} else
printf("ok(%d): after seek 8190, offset=%d, sys_offset=%d\r\n",
__LINE__, (int) fp->offset, (int) fp->sys_offset);
off2 = acl_vstream_ftell(fp);
if (off2 != off) {
printf("ftell(%lld) != off(%lld), error\r\n", off2, off);
goto END;
} else
printf("ftell(%lld) == off(%lld), ok\r\n", off2, off);
n = acl_vstream_read(fp, buf, 100);
printf("ok(%d): after read 100, n=%d offset=%d, sys_offset=%d\r\n",
__LINE__, n, (int) fp->offset, (int) fp->sys_offset);
END:
acl_vstream_close(fp);
getchar();
return 0;
}