我试图动态分配一个结构数组,但是每当我运行程序时,我不断得到:a.out(6487,0x7fff7ecb8300)malloc:*对象0x7fff6f670000错误:指针为realloc'没有被分配d *设置malloc_error_break断点调试指针被realloced没有分配
struct node {
char course[25];
char category[20];
char prereq[50];
char notes[50];
};
int main(int argc, char* argv[])
{
FILE *fp;
char *filename = argv[1];
char *token;
char buffer[100];
char *del = ",\n";
int num = 5, i = 0, j =0, count = 0;
struct node *d = malloc(num * sizeof(struct node));
char** complete = malloc(num * sizeof(char*));
printf("%s\n", filename);
if((fp = fopen(filename, "r")) == NULL)
{
printf("unable to open %s\n", filename);
exit(1);
}
while(fgets(buffer, sizeof(buffer), fp) != NULL)
{
if(count == num)
{
num = num + 5;
struct node *d = realloc(d, sizeof(d)*num);
printf("Reallocating\n");
}
token = strtok(buffer, del);
if(strncmp(token, "#", 1) != 0)
{
strcpy(d[count].course, token);
printf("%s\n", d[count].course);
strcpy(d[count].category, strtok(NULL, del));
printf("%s\n", d[count].category);
strcpy(d[count].prereq, strtok(NULL, del));
printf("%s\n", d[count].prereq);
strcpy(d[count].notes, strtok(NULL, del));
printf("%s\n", d[count].notes);
count++;
}
}
在使用'argv [1]'之前,检查'argc == 2'。只是一个建议。 –
警告:在'malloc'(等等)中调用'sizeof' [你应该总是把它写成](http://stackoverflow.com/a/17258659/1151654)作为'ptr = malloc(sizeof(* ptr) * ...);'而不是'ptr = malloc(sizeof(ptrtype *)* ...);'。 – Eregrith
因此'struct node * d = realloc(d,sizeof(d)* num);'是错误的:应该使用'sizeof(* b)'而不是'sizeof(b)' – Eregrith