Bug Summary

File:daq/rawdata/tools/dump_header.cc
Warning:line 45, column 5
Value stored to 'is' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-unknown-linux-gnu -O3 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name dump_header.cc -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/data/b2soft/buildbot/development/build -fcoverage-compilation-dir=/data/b2soft/buildbot/development/build -resource-dir /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/lib/clang/21 -isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/include/c++ -isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/include/c++/x86_64-redhat-linux -isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/include/c++/backward -isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/include -isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/include/python3.12 -isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/include/CLHEP -isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/include/Geant4 -isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/include -isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/include/root -isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/include/belle_legacy -I include/ -D _PACKAGE_="daq" -D G4UI_USE_TCSH -D RaveDllExport= -D HAS_SQLITE -D HAS_CALLGRIND -I include -I /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/include/libxml2 -internal-isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/bin/../lib64/gcc/x86_64-redhat-linux/15.2.0/../../../../include/c++ -internal-isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/bin/../lib64/gcc/x86_64-redhat-linux/15.2.0/../../../../include/c++/x86_64-redhat-linux -internal-isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/bin/../lib64/gcc/x86_64-redhat-linux/15.2.0/../../../../include/c++/backward -internal-isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /cvmfs/belle.cern.ch/el9/externals/v02-04-00/Linux_x86_64/common/bin/../lib64/gcc/x86_64-redhat-linux/15.2.0/../../../../x86_64-redhat-linux/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -Wno-missing-braces -Wno-unused-command-line-argument -std=c++20 -fdeprecated-macro -ferror-limit 19 -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -vectorize-loops -vectorize-slp -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /scan_build/2026-05-31-004316-385593-1 -x c++ daq/rawdata/tools/dump_header.cc
1/**************************************************************************
2 * basf2 (Belle II Analysis Software Framework) *
3 * Author: The Belle II Collaboration *
4 * *
5 * See git log for contributors and copyright holders. *
6 * This file is licensed under LGPL-3.0, see LICENSE.md. *
7 **************************************************************************/
8
9#include <stdio.h>
10#include <unistd.h>
11#include <vector>
12
13using namespace std;
14
15enum {
16 POS_NWORDS = 0,
17 POS_HDR_NWORDS = 1,
18 POS_NUM_EVE_NUM_NODES = 2,
19 POS_EXP_RUN_NUM = 3,
20 POS_EVE_NUM = 4,
21 POS_NODE_ID = 5
22};
23
24enum {
25 EXP_MASK = 0xFFC00000,
26 EXP_SHIFT = 22,
27 RUNNO_MASK = 0x003FFF00,
28 RUNNO_SHIFT = 8,
29 SUBRUNNO_MASK = 0x000000FF
30};
31
32
33
34int main()
35{
36 vector<unsigned int> buf(400000);
37 int infn = fileno(stdinstdin);
38 printf("infn = %d\n", infn);
39
40 int nrec = 0;
41 for (;;) {
42 int is = read(infn, &buf[0], 4);
43 // printf ( "buf[0] = %d\n", buf[0] );
44 if (is <= 0) break;
45 is = read(infn, &buf[1], (buf[0] - 1) * 4);
Value stored to 'is' is never read
46 // printf ( "nw = %d, 1st = %d, 2nd = %d, 3rd = %d\n",
47 // buf[0], buf[1], buf[2], buf[3] );
48 // printf ( "exprunnum = %8.8x, evtnum = %8.8x\n", buf[POS_EXP_RUN_NUM],
49 // buf[POS_EVE_NUM] );
50 int exp = (buf[ POS_EXP_RUN_NUM ] & EXP_MASK) >> EXP_SHIFT;
51 int run = (buf[ POS_EXP_RUN_NUM ] & RUNNO_MASK) >> RUNNO_SHIFT;
52 int evt = buf[ POS_EVE_NUM ];
53
54 printf("Nrec:%d ; Nw:%u ; Exp:%d, Run:%d, Evt:%d\n",
55 nrec, buf[0], exp, run, evt);
56 nrec++;
57 }
58
59}