问按字母顺序输入160万行(单词) .txt

EN

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

static void sort_a(void *array, unsigned n);
static int cmpr(const void *a, const void *b);

int main(void)
{
    static const char filename[] = "input.txt";
    static const char filename_out[] = "output.txt";

    int i = 0;
    int j = 0;
    FILE *file = fopen(filename, "r");
    FILE *file_write = fopen(filename_out, "w");

    char line[16];
    char *line_array[1000001]; //works sub 1 Million

    if (file != NULL){
        while (fgets(line, sizeof line, file) != NULL) {
            // Trim the newline character
            line[strcspn(line, "\n")] = '\0';

            // Stop processing if line_array is full
            if (i < sizeof line_array / sizeof *line_array) {
                line_array[i++] = strdup(line);
            }
            else {
                break;
            }
        }
        fclose(file);

        sort_a(line_array, i);

        for (j = 0; j < i; j++) {
            fprintf(file_write, "%s\n", line_array[j]);
        }
        fclose(file_write);

        // Clean up memory
        for (j = 0; j < i; j++) {
            free(line_array[j]);
        }
    }
    else {
        perror(filename);
    }
    return 0;
}

int cmpr(const void *a, const void *b) {
    return (strcmp(*(char **)a, *(char **)b));
}

void sort_a(void *array, unsigned n) {
    qsort(array, n, sizeof(const char *), cmpr);
}