wc in UNIX accepts a file name as a command line argument, but mywc currently does not - it only accepts a file redirected as standard input, using the symbol"<". --> Your task here, is to add that as a capability to mywc.c renamed as mywc_commandline.c mywc_commandline should work similar to wc in the below situation (i.e., when the prompt is 87 for wc, mywc should behave similarly, i.e., the output should look like the command at (90) which is highlighted in red. {nike:maria:87} wc 1.txt 1 1 11 1.txt {nike:maria:88} wc < 1.txt 1 1 11 {nike:maria:89} ./mywc_commandline < 1.txt 1 1 11 {nike:maria:90} ./mywc_commandline 1.txt 1 1 11

mywc_commandline.c:

// // A simple but fairly efficient C version of the Unix "wc" tool // modified from: // http://www.opensource.apple.com/source/flex/flex-9/flex/MISC/fastwc/mywc.c // // #include // #include

#include // for exit(), only #include // for STDIN_FILENO definition and read() #include // for isgraph() #include // for printf()

// --------------------------------------------------------- // // mygetC() // // // Better to use c library getc - but we have not covered // FILE * streams yet in details even if we used it for P1 // we also need to go lower level so we are doing that here. // // // We are using POSIX read() - the glibc version of read() // which is a wrapper around Linux read() // --------------------------------------------------------- // returns character read, or EOF if the file pointer // is beyond the end of the file // exits on error // --------------------------------------------------------- int my_getC( int input_fd ) { char buffer[1] ={'\0'}; int return_num_bytes_read;

return_num_bytes_read = read( input_fd, buffer, 1 ) ; if ( return_num_bytes_read == 0 ) { return EOF; } else if( return_num_bytes_read < 0 ) { perror( "mygetC: " ); exit(-1); } else { return (int) buffer[0]; } }

// --------------------------------------------------------- // main() // --------------------------------------------------------- int main( int argc, char * argv[] ) {

// register int's is a hint to keep these integers // in registers for quick access. // // It not guaranteed that these requests to be // in registers are granted. // register int c, cc = 0, wc = 0, lc = 0;

int input_fd = STDIN_FILENO;

// the input may be a file open file perhaps here?

while ( (c = my_getC( input_fd )) != EOF ) { ++cc; if( isgraph(c) ) // Checks for any printable character // except space (isgraph()). //ctype.h // // Check if the first part is a readable // word, will parse until the end of // the word { ++wc; // wc - word count is incremented do { // go until seeing a non printable // character (e.g., white space), unless it is EOF // then we would like to get out of there. c = my_getC( input_fd );

if( c == EOF ) // check for EOF { // goto statements are controversial. // it goes to label "done:" further below goto done; }

++cc; // character count is incrementd

} while ( isgraph(c) ); }

// not isgraph so check for a new line if (c == ' ') ++lc; // increment line count. }

done: printf( "%8d%8d%8d ", lc, wc, cc ); }

1.txt:

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