diff options
| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | string/strncat.c | 47 |
2 files changed, 7 insertions, 44 deletions
@@ -1,3 +1,7 @@ +2014-12-19 Ondřej Bílka <neleai@seznam.cz> + + * string/strncat.c (STRNCAT): Simplify implementation. + 2014-12-19 David S. Miller <davem@davemloft.net> * sysdeps/sparc/sparc32/soft-fp/q_neg.c (_Q_neg): Use a union to diff --git a/string/strncat.c b/string/strncat.c index 6d29114..0de9a01 100644 --- a/string/strncat.c +++ b/string/strncat.c @@ -17,10 +17,6 @@ #include <string.h> -#ifdef _LIBC -# include <memcopy.h> -#endif - #ifndef STRNCAT # undef strncat # define STRNCAT strncat @@ -29,52 +25,15 @@ char * STRNCAT (char *s1, const char *s2, size_t n) { - char c; char *s = s1; /* Find the end of S1. */ s1 += strlen (s1); - /* Make S1 point before next character, so we can increment - it while memory is read (wins on pipelined cpus). */ - s1 -= 1; - - if (n >= 4) - { - size_t n4 = n >> 2; - do - { - c = *s2++; - *++s1 = c; - if (c == '\0') - return s; - c = *s2++; - *++s1 = c; - if (c == '\0') - return s; - c = *s2++; - *++s1 = c; - if (c == '\0') - return s; - c = *s2++; - *++s1 = c; - if (c == '\0') - return s; - } while (--n4 > 0); - n &= 3; - } - - while (n > 0) - { - c = *s2++; - *++s1 = c; - if (c == '\0') - return s; - n--; - } + size_t ss = __strnlen (s2, n); - if (c != '\0') - *++s1 = '\0'; + s1[ss] = '\0'; + memcpy (s1, s2, ss); return s; } |