[英]Allocating memory for two concatenated strings
Is this a right way to allocate memory in order to store two concatenated strings? 这是分配内存以存储两个串联字符串的正确方法吗?
size_t len1 = strlen(first);
size_t len2 = strlen(second);
char * s = malloc(len1 + len2 + 2);
or should I use malloc(len1 + len2 + 1)
? 还是应该使用malloc(len1 + len2 + 1)
?
Let's look at what's necessary to store a string: 让我们看一下存储字符串的必要条件:
'\\0'
, or just 0
) 一个尾随NUL字节( '\\0'
或仅0
) That makes it strlen(first) + strlen(second) + 1
: 这使其strlen(first) + strlen(second) + 1
:
char *s = malloc(len1 + len2 + 1);
It should be 它应该是
char * s = malloc(len1 + len2 + 1); // 1 more space for \0
allocating one more space (byte) for NUL
terminator. 为NUL
终止符再分配一个空间(字节)。
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