在txt文件中搜索数据时出现分段错误(C)

Question

我有以下功能：

void find(void) {
nd = (struct node*)malloc(sizeof(struct node) * 14);
FILE *openedfile;
openedfile = fopen("NSFNet.txt", "r");
if (openedfile == NULL) {
printf("Error, file no existente");   
exit(1);
} 
fseek(openedfile, 175, SEEK_SET);
char linea[300];
char *aux;
fgets(linea, 300, openedfile); 
char *checker ="0";
int counter = 0;
int i = 0;
while (fgets(linea, 300,openedfile) != NULL) {
aux = strtok(linea, "[]"); 
int value = atoi(aux);
if (value == i) {
counter++;
}
if (value != i) {
nd[i].links = counter;
printf("El contador es:n");
printf("%dn", i);
printf("%dn", nd[i].links);
counter = 1;
i++;    
}
}
}

下一个：

void test(void) {
nd = (struct node*)malloc(sizeof(struct node) * 14);
FILE *openedfile;
openedfile = fopen("NSFNet.txt", "r");
if (openedfile == NULL) {
printf("Error, file no existente");   
exit(1);
} 
fseek(openedfile, 175, SEEK_SET);
char linea[300];
char *aux;
fgets(linea, 300, openedfile); 
char *checker ="0";
int counter = 0;
int i = 0;
while (fgets(linea, 300,openedfile) != NULL) {
aux = strtok(linea, "]"); 
aux = strtok(NULL, "]");
aux = strtok(NULL, "t");
printf("%s n",aux);
}
}

该代码从以下txt文件中提取一些数据：

Number of nodes: 14
Number of links: 42
==================================================
source  dest.   hops    path (link ids)
==================================================
[0] [1] 1   0
[0] [2] 1   2
[0] [3] 2   0-8
[0] [4] 3   0-8-12
[0] [5] 2   2-10
[0] [6] 4   0-8-12-18
[0] [7] 1   4
[0] [8] 2   4-26
[0] [9] 3   4-26-28
[0] [10]    3   0-8-14

第一代码提取第一列的数字，第二代码提取第三列的数字。两个函数都可以单独工作，但我想创建一个条件。我把两个函数混合成一个函数：

void find2(void) {
nd = (struct node*)malloc(sizeof(struct node) * 14);
FILE *openedfile;
openedfile = fopen("NSFNet.txt", "r");
if (openedfile == NULL) {
printf("Error, file no existente");   
exit(1);
} 
fseek(openedfile, 175, SEEK_SET);
char linea[300];
char *aux;
char *aux2;
fgets(linea, 300, openedfile); 
char *checker ="0";
int counter = 0;
int i = 0;
while (fgets(linea, 300,openedfile) != NULL) {
aux2 = strtok(linea, "]"); 
aux2 = strtok(NULL, "]");
aux2 = strtok(NULL, "t");
int value = atoi(aux);
int hops = atoi(aux2);
if (value == i && hops == 1) {
counter++;
}
if (value != i) {
nd[i].links = counter;
printf("El contador es:n");
printf("%dn", i);
printf("%dn", nd[i].links);
counter = 1;
i++;    
}
}
} 

混合函数有以下错误：exited, segmentation fault.求你了，有人能帮我找出我的错误吗。

Answer 1

它是一个空值。我正在将字符串(null(转换为整数，这就是出现错误的原因。

谢谢大家！