断言失败:: malloc

时间:2013-05-21 23:05:30

标签: malloc assertions

我在编码站点中运行代码并出现以下错误:

解决方案:malloc.c:2369:sysmalloc:断言`(old_top ==(((mbinptr)(((char *)&((av) - > bins [((1) - 1)* 2 ])) - __builtin_offsetof(struct malloc_chunk,fd))))&& old_size == 0)|| ((unsigned long)(old_size)> =(unsigned long)(((__ builtin_offsetof(struct malloc_chunk,fd_nextsize))+((2 *(sizeof(size_t))) - 1))&〜((2 * (sizeof(size_t))) - 1)))&&((old_top) - > size& 0x1)&&((unsigned long)old_end& pagemask)== 0)'失败。 中止(核心倾销)

代码:

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

typedef struct cell
{
    int x;
    int y;
    struct cell *prevcell;
    struct cell *nextcell;
}cell;


/* Head ends here */
void nextMove(int x, int y, int pacman_x, int pacman_y, int food_x, int food_y, char grid[x][y]){
    //logic here    
    int i=pacman_x;
    int j=pacman_y;


    cell *top,*node;
    top = NULL;

    while(grid[i][j] != '.')
    {
        node = NULL;
        //UP
        if(i != 0 && grid[i-1][j] != '%')
        {
            if(grid[i][j] != 'd')
            {
                printf("%d %d\n",i,j);
                grid[i][j]='d';
            }
            //push
            node = (cell*)malloc(sizeof(node));
            node->x=i;
            node->y=j;
            node->prevcell=top;
            node->nextcell=NULL;
            if(top != NULL)
                top->nextcell=node;
            top=node;

            i=i-1;
        }
        //LEFT
        else if(j != 0 && grid[i][j-1] != '%')
        {
            if(grid[i][j] != 'd')
            {
                printf("%d %d\n",i,j);
                grid[i][j]='d';
            }
            //push
            node = (cell*)malloc(sizeof(node));
            node->x=i;
            node->y=j;
            node->prevcell=top;
            node->nextcell=NULL;
            if(top != NULL)
                top->nextcell=node;
            top=node;

            j=j-1;
        }
        //RIGHT
        else if(j != y-1 && grid[i][j+1] != '%')
        {
            if(grid[i][j] != 'd')
            {
                printf("%d %d\n",i,j);
                grid[i][j]='d';
            }
            //push
            node = (cell*)malloc(sizeof(node));
            node->x=i;
            node->y=j;
            node->prevcell=top;
            node->nextcell=NULL;
            if(top != NULL)
                top->nextcell=node;
            top=node;

            j=j+1;
        }
        //DOWN
        else if(i != x-1 && grid[i+1][j] != '%')
        {
            if(grid[i][j] != 'd')
            {
                printf("%d %d\n",i,j);
                grid[i][j]='d';
            }
            //push
            node = (cell*)malloc(sizeof(node));
            node->x=i;
            node->y=j;
            node->prevcell=top;
            node->nextcell=NULL;
            if(top != NULL)
                top->nextcell=node;
            top=node;

            i=i+1;
        }
        else
        {
            //pop
            top=top->prevcell;
            free(top->nextcell);
            i=top->x;
            j=top->y;
        }
    }

}
/* Tail starts here */
int main() {

    int x, y;
    int pacman_x, pacman_y;
    int food_x, food_y;
    scanf( "%d %d", &pacman_x, &pacman_y);
    scanf( "%d %d", &food_x, &food_y);
    scanf( "%d %d", &x, &y);
    char grid[x][y];

    for( int i=0; i<x; i++) {
        scanf("%s[^\\n]%*c", grid[i]);
    }
    nextMove( x, y, pacman_x, pacman_y, food_x, food_y, grid);
    return 0;
}

我没有得到这个问题。有人可以帮忙吗?

2 个答案:

答案 0 :(得分:0)

您的scanf()格式错误。

scanf("%s[^\\n]%*c", grid[i]);

这是对scanf()的说法 1)字符串(%s)
2)角色'['
3)字符'^'
4)字符'\'
5)字符'n'
6)字符']'
7)char(%* c),但不存储它 你可能想放弃's'

scanf("%[^\\n]%*c", grid[i]);

想法:

char buf[80];
fgets(buf, sizeof(buf)-1, stdin);
sscanf(buf, "%[^\\n]", grid[i]);

我发现将Input与解析分开会更安全。

此外,你有

char grid[x][y];

这似乎是基于x&amp;的大小动态分配“网格”。年。这不是C(除非是新功能)。所以我需要问一下,你在使用什么编译器?

答案 1 :(得分:0)

哦......我遇到了这个问题。

以下malloc调用不正确:

       node = (cell*)malloc(sizeof(node));

它只分配4个字节(节点是一个指针)。

正确的版本是:

       node = (cell*)malloc(sizeof(*node));

OR

       node = (cell*)malloc(sizeof(cell));

我多么傻!! !!