标题: C语言strlcpy函数的实现
作者: Demon
链接: https://demon.tw/programming/c-strlcpy-implement.html
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虽然 strlcpy 函数不是 ANSI C 标准库函数的一部分,但是自己实现一个 strlcpy 函数也不是很难。
赞赏/* * Copy src to string dst of size siz. At most siz-1 characters * will be copied. Always NUL terminates (unless siz == 0). * Returns strlen(src); if retval >= siz, truncation occurred. */ size_t strlcpy(dst, src, siz) char *dst; const char *src; size_t siz; { register char *d = dst; register const char *s = src; register size_t n = siz; /* Copy as many bytes as will fit */ if (n != 0 && --n != 0) { do { if ((*d++ = *s++) == 0) break; } while (--n != 0); } /* Not enough room in dst, add NUL and traverse rest of src */ if (n == 0) { if (siz != 0) *d = '\0'; /* NUL-terminate dst */ while (*s++) ; } return(s - src - 1); /* count does not include NUL */ }
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