[PATCH 3/7] Import strnstr.c from FreeBSD.

[Gedare Bloom]

On Wed, Aug 16, 2017 at 8:14 PM, Sichen Zhao <1473996754 at qq.com> wrote:
> ---
>  freebsd/lib/libc/string/strnstr.c | 67 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 67 insertions(+)
>  create mode 100644 freebsd/lib/libc/string/strnstr.c
>
> diff --git a/freebsd/lib/libc/string/strnstr.c b/freebsd/lib/libc/string/strnstr.c
> new file mode 100644
> index 0000000..247a2b5
> --- /dev/null
> +++ b/freebsd/lib/libc/string/strnstr.c
> @@ -0,0 +1,67 @@
> +#include <machine/rtems-bsd-user-space.h>
> +
> +/*-
> + * Copyright (c) 2001 Mike Barcroft <mike at FreeBSD.org>
> + * Copyright (c) 1990, 1993
> + *     The Regents of the University of California.  All rights reserved.
> + *
> + * This code is derived from software contributed to Berkeley by
> + * Chris Torek.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + *    notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + *    notice, this list of conditions and the following disclaimer in the
> + *    documentation and/or other materials provided with the distribution.
> + * 3. Neither the name of the University nor the names of its contributors
> + *    may be used to endorse or promote products derived from this software
> + *    without specific prior written permission.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
> + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
> + * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
> + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
> + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
> + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
> + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
> + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> + * SUCH DAMAGE.
> + */
> +
> +#if defined(LIBC_SCCS) && !defined(lint)
> +static char sccsid[] = "@(#)strstr.c   8.1 (Berkeley) 6/4/93";
> +#endif /* LIBC_SCCS and not lint */
> +#include <sys/cdefs.h>
> +__FBSDID("$FreeBSD$");
> +
> +#include <string.h>
> +
> +/*
> + * Find the first occurrence of find in s, where the search is limited to the
> + * first slen characters of s.
> + */
> +char *
> +strnstr(const char *s, const char *find, size_t slen)
> +{
> +       char c, sc;
> +       size_t len;
> +
> +       if ((c = *find++) != '\0') {
> +               len = strlen(find);
> +               do {
> +                       do {
> +                               if (slen-- < 1 || (sc = *s++) == '\0')
> +                                       return (NULL);
> +                       } while (sc != c);
> +                       if (len > slen)
> +                               return (NULL);
> +               } while (strncmp(s, find, len) != 0);
> +               s--;
> +       }
> +       return ((char *)s);
> +}

This can definitely be added in newlib. Aditya may be able to assist
in the process?


> --
> 2.7.4
>
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