Ubuntu-gr Forum

migf1 έγραψε:Να σου πω μια άσκηση που σκέφτηκα που μπορείς να την κάνεις και τώρα, άμα διαβάσεις απευθείας για τα αρχεία;
Έναν κλώνο του unix/linux tool wc

Voila!

Μορφοποιημένος Κώδικας: Επιλογή όλων

#include <stdio.h>
#include <string.h>  // strtok(), strcmp()
#include <stdlib.h>  // fopen(), exit(), EXIT_SUCCESS, EXIT_FAILURE
#include <stdbool.h> // bool, true, false

#define MAX_INPUT (10000+1)

/**********************************************************************
 * open_file: Opens a file.                                           *
 *            Returns true if file opens properly, else false.        *
 **********************************************************************/
bool open_file(FILE **fp, char filename[])
{
    return ((*fp = fopen(filename, "r")) != NULL) ? true : false;
}

/**********************************************************************
 * get_data: Counts the number of characters, lines, max line length  *
 *           and words in a file. It uses strtok() to tokenize input  *
 *           and get the number of words.                             *
 **********************************************************************/
void get_data(FILE *fp, int *chars, int *lines, int *max_line_len, int *words)
{
    char text[MAX_INPUT] = {'\0'}, *p, line_len = 0;

    for (p = text; (*p = getc(fp)) != EOF; p++) {
        line_len++;

        if (*p == '\n') {
            (*lines)++;

            if (line_len - 1 > *max_line_len)
                *max_line_len = line_len - 1;
            line_len = 0;
        }
    }

    *p = '\0';                    // cover EOF char
    if (line_len > *max_line_len) // in case that file ends without a '\n'
        *max_line_len = line_len;

    *chars = p - &text[0];

    char *x = strtok(text, " \n"); // tokenize text
    while (x != NULL) {
        (*words)++;
        x = strtok(NULL, " \n");
    }
}

void help(void)
{
    puts("usage: mywc [FILE] [OPTION]...\n"
         "Print newline, word, and byte counts for a file.\n\n"
         "-c, --bytes            print the byte counts\n"
         "-m, --chars            print the character counts\n"
         "-l, --lines            print the newline counts\n"
         "-L, --max-line-length  print the length of the longest line\n"
         "-w, --words            print the word counts\n"
         "--help                 print help and exit\n");
}


int main(int argc, char *argv[])
{
    FILE *file = NULL;
    int chars = 0, lines = 0, max_line_len = 0, words = 0;

    if (argc == 1 || ! strcmp(argv[1], "--help")) {
        help();
        exit(EXIT_SUCCESS);
    }

    if (! open_file(&file, argv[1])) {
        printf("%s can't be opened\n", argv[1]);
        exit(EXIT_FAILURE);
    }

    get_data(file, &chars, &lines, &max_line_len, &words);

    if (argc == 2) {
        printf("byte counts: %d\n", chars * sizeof(char));
        printf("characters counts: %d\n", chars);
        printf("newline counts: %d\n", lines);
        printf("length of the longest line: %d\n", max_line_len);
        printf("word counts: %d\n", words);
        goto exit_;
    }

    for (char **p = &argv[2]; *p != NULL; p++) {
        if (! strcmp(*p, "-c") || ! strcmp(*p, "--bytes"))
            printf("byte counts: %d\n", chars * sizeof(char));
        else if (! strcmp(*p, "-m") || ! strcmp(*p, "--chars "))
            printf("characters counts: %d\n", chars);
        else if (! strcmp(*p, "-l") || ! strcmp(*p, "--lines"))
            printf("newline counts: %d\n", lines);
        else if (! strcmp(*p, "-L") || ! strcmp(*p, "--max-line-length"))
            printf("length of the longest line: %d\n", max_line_len);
        else if (! strcmp(*p, "-w") || ! strcmp(*p, "--words"))
            printf("word counts: %d\n", words);
        else if (! strcmp(*p, "--help")) {
            help();
            break;
        }
        else
            printf("\"%s\" is not a valid option\n", *p);
    }

exit_:
    fclose(file);
    exit(EXIT_SUCCESS);
}

Είναι παραλλαγή όμως, δεν δουλεύει ακριβώς όπως το wc. Επίσης δουλεύει μόνο με text files που περιέχουν μέχρι 10.000 χαρακτήρες.
Το ονόμασα mywc.

Η εικόνα βοήθειας:

Κώδικας: Επιλογή όλων

ilias@ilias-pc:~$ ./mywc --help
usage: mywc [FILE] [OPTION]...
Print newline, word, and byte counts for a file.

-c, --bytes print the byte counts
-m, --chars print the character counts
-l, --lines print the newline counts
-L, --max-line-length print the length of the longest line
-w, --words print the word counts
--help print help and exit

ilias@ilias-pc:~$

Και σε δράση ( ) :