如何在C中按字母顺序对文件行进行排序？

Question

好的，我现在所拥有的，检查单词的数量。但我在尝试按字母顺序对单词进行排序时遇到问题。

我宁愿这样做，只计算它们的数量。

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

typedef struct node *node_ptr; 

typedef struct node {
    int count;
    char *word;
    node_ptr next;
} node_t;  

char *words[] = { "hello", "goodbye", "sometimes", "others", "hello", "others", NULL }; 

node_ptr new_node() {
    node_ptr aNode;

    aNode = (node_ptr)(malloc(sizeof(node_t)));
    if (aNode) {
        aNode->next = (node_ptr)NULL;
        aNode->word = (char *)NULL;
        aNode->count = 0;
    }
    return aNode;
}

node_ptr add_word(char *word, node_ptr theList) {
    node_ptr currPtr, lastPtr, newPtr;
    int result;
    int found = 0;

    currPtr = theList;
    lastPtr = NULL;
    printf("Checking word:%s\n", word);

    if (!currPtr) {
        newPtr = new_node();
        if (!newPtr) {
            fprintf(stderr, "Fatal Error. Memory alloc error\n");
            exit(1);
        }
        newPtr->word = word;
        newPtr->next = currPtr;
        newPtr->count = 1;
        found = 1;
        theList = newPtr;
    }
    while (currPtr && !found) {
        result = strcmp(currPtr->word, word); 
        if (result == 0) {
            currPtr->count += 1;
            found = 1;
        } else
        if (result>0) {
            newPtr = new_node();
            if (!newPtr) {
                fprintf(stderr, "Fatal Error. Memory alloc error\n");
                exit(1);
            }
            newPtr->word = word;
            newPtr->next = currPtr;
            newPtr->count = 1;

            if (lastPtr) {
                lastPtr->next = newPtr;
            } else {
                theList = newPtr;
            }
            found = 1;
        } else {
            lastPtr = currPtr;
            currPtr = currPtr->next;
        }
    }

    if ((!found) && lastPtr) {
        newPtr = new_node();
        if (!newPtr) {
            fprintf(stderr, "Fatal Error. Memory alloc error\n");
            exit(1);
        }
        newPtr->word = word;
        newPtr->next = (node_ptr)NULL;
        newPtr->count = 1;
        lastPtr->next = newPtr;
        found = 1;
    }
    return theList; 
}

void printList(node_ptr theList) {
    node_ptr currPtr = theList;

    while (currPtr) {
        printf("word: %s\n", currPtr->word);
        printf("count: %d\n", currPtr->count);
        printf("---\n");
        currPtr = currPtr->next; 
    }
}

int main() {
    char **w = words;
    node_ptr theList = (node_ptr)NULL;

    printf("Start\n");
    while (*w) {
        theList = add_word(*w, theList);
        w++;
    }

    printList(theList);
    printf("OK!\n");
    return 0;
}

我还想从一系列文字中读取，而不是从文件中读取。

FILE *fp;
fp = fopen("some.txt", "w");

如何使用我创建的结构从文件中读取并对其进行排序？

感谢您的帮助！我试图自学C：）