我的程序从文件中读取人员,并将他们的信息保存到Person结构中,如下所示:
struct person
{
char *fname;
char *lname;
int id;
};
typedef struct person Person;
这些人被保存在person数组中,填充该数组的函数看起来像这样(total变量是从文件中计算的person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,并调用了临时字符串末尾的' '。不知道为什么我得到这些错误:
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)
谢谢你的帮助。我已经看过几个线程,其中大多数都是关于不调用/mallocing ' '在字符结束。我这样做,但我仍然得到这些错误和更多,当我排序的人与qsort()数组。我很抱歉,如果这是相同的问题已经问过之前,我找不到线程。
你使用了错误的长度来分配第二部分,
fscanf(fin, "%s", temp2);
p[i].lname = (char *) calloc(strlen(temp)+1, sizeof(char));
strcpy(p[i].lname, temp2);
这里应该用strlen(temp2);