snprintf的困惑
这两天在整理c语言基本函数的一些注意点和用法，整理到snprintf的时候却犯了难，到底应该怎么用？
按理说，要正确使用很简单，至少有两种写法：
#include <stdio.h>
#define BUFSIZ 16
int main(int argc,char **argv)
{
char buf[BUFSIZ];
snprintf(buf, sizeof(buf) - 1, "%s", argv[1]);
buf[sizeof(buf) - 1] = '\0'; /* buf是全局变量或者已经初始化为0时不需要 */
return 0;
}
#define BUFSIZ 16
int main(int argc,char **argv)
{
char buf[BUFSIZ];
snprintf(buf, sizeof(buf) - 1, "%s", argv[1]);
buf[sizeof(buf) - 1] = '\0'; /* buf是全局变量或者已经初始化为0时不需要 */
return 0;
}
或者
#include <stdio.h>
#define BUFSIZ 16
int main(int argc,char **argv)
{
char buf[BUFSIZ];
int ret;
ret = snprintf(buf, sizeof(buf), "%s", argv[1]);
if((ret >= sizeof(buf)) || (ret < 0))
{
/* truncated or error */
buf[sizeof(buf) - 1] = '\0';
}
return 0;
}
#define BUFSIZ 16
int main(int argc,char **argv)
{
char buf[BUFSIZ];
int ret;
ret = snprintf(buf, sizeof(buf), "%s", argv[1]);
if((ret >= sizeof(buf)) || (ret < 0))
{
/* truncated or error */
buf[sizeof(buf) - 1] = '\0';
}
return 0;
}
但是问题在于，这两种写法都很繁琐，在实际使用中几乎没有谁会去这么写。
我手头刚好有一些opensource的代码，便搜索了一便，最后发现基本都是直接调用了snprintf，却没有去检查最后的空结尾的问题；而很多代码都实际是有可能存在此问题的。
那我们在实际写程序的时候到底应该怎么操作呢?
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