我想知道是否有一种更干净、更有效的方法来执行以下操作strncpy
考虑到max
字符数。我觉得自己做得太过分了。
int main(void)
{
char *string = "hello world foo!";
int max = 5;
char *str = malloc (max + 1);
if (str == NULL)
return 1;
if (string) {
int len = strlen (string);
if (len > max) {
strncpy (str, string, max);
str[max] = '\0';
} else {
strncpy (str, string, len);
str[len] = '\0';
}
printf("%s\n", str);
}
return 0;
}
我不会用strncpy
为此。至少如果我明白你想要做什么,我可能会做这样的事情:
char *duplicate(char *input, size_t max_len) {
// compute the size of the result -- the lesser of the specified maximum
// and the length of the input string.
size_t len = min(max_len, strlen(input));
// allocate space for the result (including NUL terminator).
char *buffer = malloc(len+1);
if (buffer) {
// if the allocation succeeded, copy the specified number of
// characters to the destination.
memcpy(buffer, input, len);
// and NUL terminate the result.
buffer[len] = '\0';
}
// if we copied the string, return it; otherwise, return the null pointer
// to indicate failure.
return buffer;
}
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