diff options
Diffstat (limited to 'newlib/libc/string/strncat.c')
-rw-r--r-- | newlib/libc/string/strncat.c | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/newlib/libc/string/strncat.c b/newlib/libc/string/strncat.c deleted file mode 100644 index 57ca068..0000000 --- a/newlib/libc/string/strncat.c +++ /dev/null @@ -1,115 +0,0 @@ -/* -FUNCTION - <<strncat>>---concatenate strings - -INDEX - strncat - -ANSI_SYNOPSIS - #include <string.h> - char *strncat(char *<[dst]>, const char *<[src]>, size_t <[length]>); - -TRAD_SYNOPSIS - #include <string.h> - char *strncat(<[dst]>, <[src]>, <[length]>) - char *<[dst]>; - char *<[src]>; - size_t <[length]>; - -DESCRIPTION - <<strncat>> appends not more than <[length]> characters from - the string pointed to by <[src]> (including the terminating - null character) to the end of the string pointed to by - <[dst]>. The initial character of <[src]> overwrites the null - character at the end of <[dst]>. A terminating null character - is always appended to the result - -WARNINGS - Note that a null is always appended, so that if the copy is - limited by the <[length]> argument, the number of characters - appended to <[dst]> is <<n + 1>>. - - -RETURNS - This function returns the initial value of <[dst]> - -PORTABILITY -<<strncat>> is ANSI C. - -<<strncat>> requires no supporting OS subroutines. - -QUICKREF - strncat ansi pure -*/ - -#include <string.h> -#include <limits.h> - -/* Nonzero if X is aligned on a "long" boundary. */ -#define ALIGNED(X) \ - (((long)X & (sizeof (long) - 1)) == 0) - -#if LONG_MAX == 2147483647L -#define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080) -#else -#if LONG_MAX == 9223372036854775807L -/* Nonzero if X (a long int) contains a NULL byte. */ -#define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080) -#else -#error long int is not a 32bit or 64bit type. -#endif -#endif - -#ifndef DETECTNULL -#error long int is not a 32bit or 64bit byte -#endif - -char * -_DEFUN (strncat, (s1, s2, n), - char *s1 _AND - _CONST char *s2 _AND - size_t n) -{ -#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__) - char *s = s1; - - while (*s1) - s1++; - while (n-- != 0 && (*s1++ = *s2++)) - { - if (n == 0) - *s1 = '\0'; - } - - return s; -#else - char *s = s1; - - /* Skip over the data in s1 as quickly as possible. */ - if (ALIGNED (s1)) - { - unsigned long *aligned_s1 = (unsigned long *)s1; - while (!DETECTNULL (*aligned_s1)) - aligned_s1++; - - s1 = (char *)aligned_s1; - } - - while (*s1) - s1++; - - /* s1 now points to the its trailing null character, now copy - up to N bytes from S2 into S1 stopping if a NULL is encountered - in S2. - - It is not safe to use strncpy here since it copies EXACTLY N - characters, NULL padding if necessary. */ - while (n-- != 0 && (*s1++ = *s2++)) - { - if (n == 0) - *s1 = '\0'; - } - - return s; -#endif /* not PREFER_SIZE_OVER_SPEED */ -} |