我的程序从文件中读取人员并将他们的信息保存到人员结构中,如下所示:
struct person
{
char *fname;
char *lname;
int id;
};
typedef struct person Person;
这些人保存在 Persons 数组中,填充该数组的函数如下所示(total 变量是从文件中计算的 Persons 总数):
Person* fillArray(int total, FILE *fin)
{
rewind(fin);
int i;
char temp[50];
char temp2[50];
Person *p = (Person*) calloc(total, sizeof(Person));
for(i = 0; i < total; i++)
{
fscanf(fin, "%s", temp);
p[i].fname = (char *) calloc(strlen(temp)+1, sizeof(char));
strcpy(p[i].fname, temp);
fscanf(fin, "%s", temp2);
p[i].lname = (char *) calloc(strlen(temp)+1, sizeof(char));
strcpy(p[i].lname, temp2);
fscanf(fin, "%d", &(p + i)->id);
}
return p;
}
我清理了所有使用的内存,并为临时字符串末尾的 '\0' 调用了 calloc 。不知道为什么我会收到这些错误:
HEAP SUMMARY:
==4736== in use at exit: 0 bytes in 0 blocks
==4736== total heap usage: 8 allocs, 8 frees, 414 bytes allocated
==4736==
==4736== All heap blocks were freed -- no leaks are possible
==4736==
==4736== ERROR SUMMARY: 10 errors from 2 contexts (suppressed: 0 from 0)
==4736==
==4736== 3 errors in context 1 of 2:
==4736== Invalid write of size 1
==4736== at 0x402C6E8: strcpy (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==4736== by 0x804898E: fillArray (cscd240_s13_lab11Functions.c:30)
==4736== by 0x8048731: main (cscd240_s13_lab11Tester.c:13)
==4736== Address 0x41ef24f is 3 bytes after a block of size 4 alloc'd
==4736== at 0x402A5E6: calloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==4736== by 0x804896A: fillArray (cscd240_s13_lab11Functions.c:29)
==4736== by 0x8048731: main (cscd240_s13_lab11Tester.c:13)
==4736==
==4736==
==4736== 7 errors in context 2 of 2:
==4736== Invalid write of size 1
==4736== at 0x402C6C3: strcpy (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==4736== by 0x804898E: fillArray (cscd240_s13_lab11Functions.c:30)
==4736== by 0x8048731: main (cscd240_s13_lab11Tester.c:13)
==4736== Address 0x41ef24c is 0 bytes after a block of size 4 alloc'd
==4736== at 0x402A5E6: calloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==4736== by 0x804896A: fillArray (cscd240_s13_lab11Functions.c:29)
==4736== by 0x8048731: main (cscd240_s13_lab11Tester.c:13)
==4736==
==4736== ERROR SUMMARY: 10 errors from 2 contexts (suppressed: 0 from 0)
感谢您的帮助。我已经查看了几个线程,其中大多数不是关于字符末尾的 '\0' 的 calloc/mallocing 。我这样做了,但是当我使用 qsort() 对 Person 数组进行排序时,我仍然会遇到这些错误以及更多错误。如果这与之前提出的问题相同,我深表歉意,我找不到线程。