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Diffstat (limited to 'lib/strnstr.c')
-rw-r--r-- | lib/strnstr.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/lib/strnstr.c b/lib/strnstr.c new file mode 100644 index 0000000000..57aed55fb0 --- /dev/null +++ b/lib/strnstr.c @@ -0,0 +1,47 @@ +/* + * Copyright (C) 2003 Nikos Mavroyanopoulos + * + * This file is part of GNUTLS. + * + * The GNUTLS library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <defines.h> +#ifndef HAVE_STRNSTR +# include <string.h> + +char *strnstr(const char *haystack, const char *needle, size_t haystacklen) +{ + char *p; + ssize_t plen; + ssize_t len = strlen(needle); + + if (*needle == '\0') /* everything matches empty string */ + return (char*) haystack; + + plen = haystacklen; + for (p = (char*) haystack; p != NULL; p = memchr(p + 1, *needle, plen-1)) { + plen = haystacklen - (p - haystack); + + if (plen < len) return NULL; + + if (strncmp(p, needle, len) == 0) + return (p); + } + return NULL; +} + +#endif |