Question

我想通过循环从文本文件中读取多行，但我的Conditional jump or move depends on uninitialised value(s)行中始终出现getline()错误。

我的代码：

char *string;
size_t len = 0;   

while (getline(&string, &len, fileStream) != -1) { // error happens this line   
    // do something  
}

free(string);   
fclose(fileSream);

我试过但未能修复它。任何解决方案将不胜感激。

Answer 1

您需要执行以下任一操作。

将char *string = NULL;和len设置为0。 ^{[[Preferred method]]}
将内存分配给char *string并使用len发送已分配内存的大小。

来自man page的相关引用以供参考

   If *lineptr is set to NULL and *n is set 0 before the call, then
   getline() will allocate a buffer for storing the line.  This buffer
   should be freed by the user program even if getline() failed.

   Alternatively, before calling getline(), *lineptr can contain a
   pointer to a malloc(3)-allocated buffer *n bytes in size.  If the
   buffer is not large enough to hold the line, getline() resizes it
   with realloc(3), updating *lineptr and *n as necessary.

Valgrind-getline（）函数未初始化的值错误

1 个答案: