diff options
| -rw-r--r-- | string/strnlen.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/string/strnlen.c b/string/strnlen.c index 83a6f44eca..a777b35ca9 100644 --- a/string/strnlen.c +++ b/string/strnlen.c @@ -1,5 +1,5 @@ /* Find the length of STRING, but scan at most MAXLEN characters. - Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc. + Copyright (C) 1996, 1997, 1998, 2000, 2001 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -19,13 +19,26 @@ #include <string.h> -/* Find the length of STRING, but scan at most MAXLEN characters. - If no '\0' terminator is found in that many characters, return MAXLEN. */ +/* Find the length of S, but scan at most MAXLEN characters. If no + '\0' terminator is found in that many characters, return MAXLEN. */ size_t -__strnlen (const char *string, size_t maxlen) +__strnlen (const char *s, size_t maxlen) { - const char *end = memchr (string, '\0', maxlen); - return end ? (size_t) (end - string) : maxlen; + size_t len = 0; + + while (s[len] != '\0' && maxlen > 0) + { + if (s[++len] == '\0' || --maxlen == 0) + return len; + if (s[++len] == '\0' || --maxlen == 0) + return len; + if (s[++len] == '\0' || --maxlen == 0) + return len; + ++len; + --maxlen; + } + + return len; } weak_alias (__strnlen, strnlen) |