用C语言实现shell中wc命令

#include <stdio.h>

int main(int argc, char *argv[]) {
    if (argc != 2) {
        printf("Usage: %s <filename>\n", argv[0]);
        return 1;
    }

    FILE *file = fopen(argv[1], "r");
    if (file == NULL) {
        printf("Failed to open file: %s\n", argv[1]);
        return 1;
    }

    int lines = 0;
    int words = 0;
    int bytes = 0;
    int in_word = 0;
    char ch;

    while ((ch = fgetc(file)) != EOF) {
        bytes++;

        if (ch == '\n') {
            lines++;
        }

        if (ch == ' ' || ch == '\t' || ch == '\n') {
            in_word = 0;
        } else if (in_word == 0) {
            in_word = 1;
            words++;
        }
    }

    fclose(file);

    printf("Lines: %d\n", lines);
    printf("Words: %d\n", words);
    printf("Bytes: %d\n", bytes);

    return 0;
}