free出错

[tracyjk]

#include <stdio.h>

int getinfo(int num,char *buf,char *retval)
{
	char *in = buf;
	while(*in)
	{
		if(*in == '|')
		{
			num--;
			if(0 == num)
				break;
		}
		else
		{
			*retval = *in;
			retval++;
			in++;
		}
	}
}
main()
{
	char a[]="02|03|04|05|06|0201|0202|";
	char b[]="6605672251|6605672252|6605754283|6605672254|6605672255|6605672256|6605754287|";
	
	char *excp_record,*cons_record;
	excp_record = (char *)malloc(sizeof(a)+1);
	cons_record = (char *)malloc(sizeof(b)+1);
	
	excp_record = a;
	cons_record = b;
	int i;
	char *temp,*type;
	temp = (char *)malloc(5);
	type = (char *)malloc(12);
	for(i = 1; i < 15; i++)
	{
		memset(temp,0x00,12);
		memset(type,0x00,6);
		getinfo(i,excp_record,temp);
		getinfo(i,cons_record,type);
		printf("%s-%s\n",temp,type);
	}
	
	free(excp_record);
	free(cons_record);
	free(temp);
	free(type);
	return 0;
}

错误如下：
(gdb)
46 free(excp_record);
(gdb)

Program received signal SIGSEGV, Segmentation fault.
0x0092faa0 in free () from /lib/tls/libc.so.6

不明白为什么free会出错，麻烦哪个大牛告知下

[無_1024]

缺少头文件啊
#include <maloc.h>

[無_1024]

#include <malloc.h>
#include <string.h>

缺少这两个头文件

[sujiewen]

excp_record = a;
cons_record = b;
你不能这样做

[T0Ols]

free函数的头文件是 malloc.h
然后我估计还是报错 但是错误不一样了 把错误在发出来

[sujiewen]

excp_record = a;
cons_record = b;
这里错了，你这样近是excp_record 指针指向a数组，你free数组a能不错吗？
memcpy(excp_record,a,size);

[zhanghuayi_xiyou]

把一些对excp_record 操作忽略掉，看看做了什么:

char a[]="02|03|04|05|06|0201|0202|";
excp_record = (char *)malloc(sizeof(a)+1);
excp_record = a;
free (excp_record);

申请堆的数据空间，释放的栈的数据。

[pengzhixi]

//excp_record = a;
// cons_record = b;

这两句注销吧，否则你分配的内存全部丢失了。

[bdmh]

excp_record 的内存已经被破坏，free时，已经不能正确访问当成malloc的内存了，跟踪一下看看哪里对其进行了改变

[AlanBruce]

蹲在楼下

[就想叫yoko]

+1[Quote=引用 5 楼 sujiewen 的回复:]
excp_record = a;
cons_record = b;
这里错了，你这样近是excp_record 指针指向a数组，你free数组a能不错吗？
memcpy(excp_record,a,size);
[/Quote]

[bdmh]

    excp_record = a;
    cons_record = b;
换成
    strcpy(excp_record,a);
    strcpy(cons_record,b);

[freefei]

[Quote=引用 3 楼 sujiewen 的回复:]

excp_record = a;
cons_record = b;
你不能这样做
[/Quote]
+1

[PG]

excp_record = a;
cons_record = b;

[jokenit]

excp_record = a;
cons_record = b;

既然给“excp_record”和“cons_record”分配了内存，就不应该再把它们指向别的地方。后来free的是系统分配给a和b的空间，当然会出错。你这边应该是对它们进行赋值吧？可以用snprintf和memcpy等。

[tracyjk]

解决了
THX

[bobo364]

如下是报错的提示，应该是没加头文件，至于楼下说的问题，也应该注意。
D:\C project\3.c||In function 'main':|
D:\C project\3.c|28|warning: incompatible implicit declaration of built-in function 'malloc'|
D:\C project\3.c|39|warning: incompatible implicit declaration of built-in function 'memset'|
D:\C project\3.c|46|warning: incompatible implicit declaration of built-in function 'free'|
||=== Build finished: 0 errors, 3 warnings ===|

#include <stdio.h>

int getinfo(int num,char *buf,char *retval)
{
char *in = buf;
while(*in)
    {
        if(*in == '|')
            {
                num--;
                if(0 == num)
                    {
                        break;
                    }
            }
        else
            {
                *retval = *in;
                retval++;
                in++;
            }
    }
}
main()
{
char a[]="02|03|04|05|06|0201|0202|";
char b[]="6605672251|6605672252|6605754283|6605672254|6605672255|6605672256|6605754287|";

char *excp_record,*cons_record;
excp_record = (char *)malloc(sizeof(a)+1);
cons_record = (char *)malloc(sizeof(b)+1);

excp_record = a;
cons_record = b;
int i;
char *temp,*type;
temp = (char *)malloc(5);
type = (char *)malloc(12);
for(i = 1; i < 15; i++)
    {
        memset(temp,0x00,12);
        memset(type,0x00,6);
        getinfo(i,excp_record,temp);
        getinfo(i,cons_record,type);
        printf("%s-%s\n",temp,type);
    }

free(excp_record);
free(cons_record);
free(temp);
free(type);

system("pause");
return 0;
}