I wrote a program that would count a specific character in a file u and d's

The program must output to stdout if the number read is 'u' and 'd' but output to stderr the number of characters read that are not 'u' or 'd'. And the program must return 0 to the calling shell if at least one 'u' or 'd' was found in the collection of files specified on the command line. Otherwise, the program must return 1 the calling shell. However I am having trouble checking if the output for stderr and also the return call.

Here is my code and output of what I have for reference

#include

#include

#include

#include

#include

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

int UDcount = 0;

int otherCount = 0;

for(int i = 1; i

const char *path = argv[i];

int fd = open(path, O_RDONLY);

if(0>fd){

printf("opening to: %d ",errno);

}else{

char buffer[1] = {0};

int status = 0;

status = read(fd,buffer,1);

do{

if(*buffer == 'U' | *buffer == 'u' | *buffer == 'D' | *buffer == 'd'){

UDcount++;

}

else{

otherCount++;

}

status = read(fd,buffer,1);

}while(0

}

close(fd);

}

fprintf(stdout," the UD count: %d", UDcount);

fprintf(stderr," the not UD count: %d", otherCount);

return 0;

}

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