Question: Please help. Fill in the missing code in #include #include #include #include #include void usage( char *cmd ) { printf(Usage: %s fileName , cmd);
Please help. Fill in the missing code in
#include
void usage( char *cmd ) { printf("Usage: %s fileName " , cmd); printf(" Options are: "); printf(" -h display this help screen "); printf(" -s n start reading at location 'n'. Default n=0 "); printf(" -c m read 'm' bytes. Default m=1 "); }
/*-------------------------------------------------------------------------*/
bool parse_CL( int argc, char **argv, bool *sOpt, unsigned *sVal , bool *cOpt, unsigned *cVal, char **file ) { int opt;
// Initialize the call-by-ref agruments *sOpt = *cOpt = false ; *sVal = 0; *cVal=1 ; *file = NULL ; opterr = 0 ; /* Prevent getopt() from printing error messages */ char *optionStr = "...." ;
.... while ( ( opt = getopt(argc, argv, optionStr ) ) != -1) { switch (opt) { case 'h': usage( argv[0] ); return true ; break ; case 's': .... break ;
case 'c': .... break ;
default: usage( argv[0] ) ; // invalid options found return false ; } }
// Get the mandatory file name // Exactly ONE FileName must be passed at the end of command line .... return true; }
/*-------------------------------------------------------------------------*/
bool read_bytes (FILE *file, unsigned long start, unsigned long count, void* buffer) { if ( fseek ( .... ) != 0 ) return false; // Invalid starting location in the file
if( fread( .... ) != 1 ) return false; // The desired number of bytes could not be read from the file
return true; } /*-------------------------------------------------------------------------*/
#define MAXBUF 2000
int main (int argc, char **argv) { bool s_opt , c_opt ; unsigned s_val , c_val ; char *fname = NULL ; uint8_t data[MAXBUF] ; // Parse command line and check for failure if( ! parse_CL ( .... ) ) exit( EXIT_FAILURE );
if( !fname ) // Parsing succeeds, but no file name, it was a '-h' case exit( EXIT_SUCCESS );
// Open the input file FILE *input = fopen( .... ); if( !input ) { puts("Failed to read file"); exit( EXIT_FAILURE ); }
// Read the desired file bytes into the buffer if( ! read_bytes( .... ) ) { puts("Failed to read file"); exit( EXIT_FAILURE ); }
// Now, dump those bytes to the stdout in hexadecimal format int i=0 ; while ( i
exit( EXIT_SUCCESS ); }
the output needs to be like this:
:~/cs261/toys$ ::/cs261/toys$ gcc -o fileio fileIO.c :/cs261/toys$ ~/cs261/toys$ . /file10 -h Usage: ./fileio
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