sysrap/tests/ArgsTest.cc

0001 // gcc ArgsTest.cc -lstdc++ -Wvla -o /tmp/ArgsTest && /tmp/ArgsTest red green blue cyan magenta yellow black
0002 // head -1 ArgsTest.cc | perl -pe 's,//,,' - | sh
0003
0004 #include <string.h>
0005 #include <stdio.h>
0006
0007
0008 void check(int argc, char** argv)
0009 {
0010     char** args = new char*[argc] ;
0011     for(int i=0 ; i < argc ; ++i ) args[i] = strdup(argv[i]) ;
0012     for(int i=0 ; i < argc ; ++i ) printf(" %2d : [%s] \n", i, args[i] );
0013 }
0014
0015 void check1()
0016 {
0017     int argc(1);
0018     //  char* argv[argc] ;   // <-- ok with clang, but with juno options -Wvla :  warning: ISO C++ forbids variable length array ‘argv’
0019
0020     char** argv = new char*[argc] ;
0021     argv[0] = (char*)"ArgsTest.cc" ;
0022     check(argc, argv);
0023     delete [] argv ;
0024
0025 }
0026
0027 void check1fix()
0028 {
0029     //enum { argc = 1 } ;
0030     const int argc = 1 ;
0031     char* argv[argc] ;
0032     argv[0] = (char*)"ArgsTest.cc" ;
0033     check(argc, argv);
0034 }
0035
0036
0037 void check2()
0038 {
0039
0040     //int argc(2);
0041     //char* argv[argc] ;
0042     enum { argc = 2 } ;
0043     char* argv[argc] ;
0044
0045     argv[0] = (char*)"ArgsTest.cc" ;
0046     argv[1] = (char*)"red" ;
0047
0048     check(argc, argv);
0049 }
0050
0051 int main(int argc, char** argv)
0052 {
0053     //check(argc, argv);
0054
0055     //check1();
0056     check1fix();
0057     check2();
0058
0059     return 0 ;
0060 }