使用stdio在Linux中读取和排序管道数据

#include<stdio.h>
#include <stdlib.h>
#include<string.h>

#define MAX_LINE_LENGTH 1024

int main() {
    char line[MAX_LINE_LENGTH];
    int num_lines = 0;
    char** lines = NULL;

    while (fgets(line, MAX_LINE_LENGTH, stdin)) {
        num_lines++;
        lines = realloc(lines, num_lines * sizeof(char*));
        lines[num_lines - 1] = strdup(line);
    }

    for (int i = 0; i < num_lines; i++) {
        for (int j = i + 1; j < num_lines; j++) {
            if (strcmp(lines[i], lines[j]) > 0) {
                char* temp = lines[i];
                lines[i] = lines[j];
                lines[j] = temp;
            }
        }
    }

    for (int i = 0; i < num_lines; i++) {
        printf("%s", lines[i]);
    }

    for (int i = 0; i < num_lines; i++) {
        free(lines[i]);
    }
    free(lines);

    return 0;
}

cat file.txt | ./sort_lines