[Courses] [C] Lesson 13: exc1 answer, problem on exc2

[Morgon Kanter]

I'll start with my exercise 1 answer first. Unlike exc2, it uses file 
descriptors unneedingly.

/********* BEGIN EXC 1 **********/
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>

int main(int argc, char *argv[]) {
    unsigned int number_of_lines = 0;
    int fd;
    FILE *file;
    int input;

    if(argc != 2) {
        fputs("Error: inproper number of arguments.\n", stderr);
        fputs("Usage: ./lines filename\n", stderr);
        return -1;
    }

    fd = open(argv[1], O_RDONLY);
    if(errno == ENOENT) {
        fputs("Error: No such file by that name.\n", stderr);
        return -1;
    }
    file = fdopen(fd, "r");

    while(input != EOF) {
        input = getc(file);        
        if(input == 10) number_of_lines++;
    }

    printf("There were %i lines in %s\n", number_of_lines, argv[1]); 

    return 0;
}
/********** END **********/
Output for this:
./exc1 blah
There were 4 lines in blah (note: this is correct)
./exc1 yo
Error: No such file by that name
-----------------
Okay, here is exercise 2. I'm having a bit of trouble in this one because in 
the output file, it copies correctly but it adds the character "y" with a 
sideways-colon over top of it on a newline. Any ideas why?
/************** BEGIN EXERCISE 2 ***************/
/* All tabs will be expanded to FOUR spaces. Insane 
 * people who keep pushing for 8 space tabs!
*/
#include <stdio.h>
#include <errno.h>

int main(int argc, char *argv[]) {
    FILE *file_read;
    FILE *file_write;
    int current_char;

    if(argc != 3) {
        fprintf(stderr, "Error: Improper use of arguments.\n");
        fprintf(stderr, "Usage: exc2 copyfile createdfile\n");
        return -1;
    }

    file_read = fopen(argv[1], "r");
    if(errno == ENOENT) {
        fprintf(stderr, "Error: No such file.\n");
        return -1;
    } else if(file_read == NULL) {
        fprintf(stderr, "Error: Wrong permissions on file-to-copy.\n");
        return -1;
    }
    
    file_write = fopen(argv[2], "w");
    if(file_write == NULL) {
        fprintf(stderr, "Error: No write permissions.\n");
        return -1;
    }
    
    while(current_char != EOF) {
        current_char = fgetc(file_read);
        
        if(current_char == 9) {
            fputs("    ", file_write);
        } else {
            fputc(current_char, file_write);
        }
    }
    
    fclose(file_read);
    file_read = NULL;
    fclose(file_write);
    file_write = NULL;

    printf("Copied %s to %s with expanded tabs.\n", argv[1], argv[2]);
        
    return 0;
}
/************ END **************/

Morgon
--
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