c - fgets() strtok()

Question

嘿，我的任务是从由空格分隔的文件中读取数据并对数据进行排序。我不断遇到段错误，但我无法弄清楚我的代码出了什么问题。感谢您的帮助。

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define MAX_LINE 100
#define MAX_NAME 30
int countLinesInFile(FILE* fptr);
int findPlayerByName(char **names, char* target, int size);
int findMVP(int* goals, int* assists, int size);
void printPlayers(int* goals, int* assists, char** names, int size);
void allocateMemory(int **goals, int** assists, char*** names, int size);
void sortPlayersByGoals(int* goals, int* assists, char** names, int size);
void writeToFile(FILE *fptr, int* goals, int* assists, char** names, int size);
void readLinesFromFile(FILE* fptr, int* goals, int* assists, char** names, int        numLines);

int main(int argc, char **argv)
{
    FILE *fptr;
    int size;
    int* goals;
    int* assists;
    char** names;
    if(argc != 2)
    {
            printf("Invalid number of arguments\n");
            return 1;
    }
    fptr = fopen(argv[1], "r");
    if(fptr == NULL)
    {
            printf("Failed to open input file.\n");
            return 2;
    }
    size = countLinesInFile(fptr);
    allocateMemory(&goals, &assists, &names, size);
    int numLines;
    numLines = size;
    readLinesFromFile(fptr, goals, assists, names, numLines);
    printPlayers(goals, assists, names, size);

    return 3;
}
void printPlayers(int* goals, int* assists, char** names, int size)
{
    int i;
    for(i = 0; i < size; i++)
    {
    printf("%c     %d     %d", *(names + i), *(goals + i), *(assists + i));
    }

}
void readLinesFromFile(FILE* fptr, int* goals, int* assists, char** names, int numLines)
{
    char line[MAX_LINE];
    int i;
    char* value;

    for(i = 0; i < numLines; i++)
    {
            fgets(line, MAX_LINE, fptr);
            value = strtok(line, " ");
            *(*names + i) = atoi(value);
            value = strtok(line, " ");
            *(goals + i) = atoi(value);
            value = strtok(line, " ");
            *(assists + i) = atoi(value);
    }


}
void allocateMemory(int **goals, int** assists, char*** names, int size)
{

    *goals = malloc(sizeof(int)* size);
    *assists = malloc(sizeof(int)* size);
    *names = malloc(sizeof(char*)* MAX_NAME);

}
int countLinesInFile(FILE* fptr)
{
    int i;
    char line[MAX_LINE];
    i = 0;
    while(fgets(line, MAX_LINE, fptr) != NULL)
    {
    i++;
    }
    rewind(fptr);
    return i;
}

--插入--

输入文件如下所示:雷登 2 0伯格伦德 5 2 jack 曼 2 0斯图尔特 4 0押江 3 5麦当劳 2 4皮特兰杰洛 2 7佩隆 2 6塔拉森科 5 5

Answer 1

在 allocateMemory() 中，每个 *names 都是一个 char **。您需要分配两次

*names = malloc(...);
for (<each pointer in names>) {
    <pointer> = malloc(...);
}

别忘了释放两次

for (<each pointer in names>) {
    free(<pointer>);
}
free(*names);