1 files changed, 54 insertions, 0 deletions

diff --git a/src/lib/libc/string/strspn.c b/src/lib/libc/string/strspn.c
new file mode 100644
index 0000000000..d51a8cd3e6
--- /dev/null
+++ b/src/lib/libc/string/strspn.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * 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 *rcsid = "$OpenBSD: strspn.c,v 1.4 2003/06/11 21:08:29 deraadt Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <string.h>
+
+/*
+ * Span the string s2 (skip characters that are in s2).
+ */
+size_t
+strspn(const char *s1, const char *s2)
+{
+        const char *p = s1, *spanp;
+        char c, sc;
+
+        /*
+         * Skip any characters in s2, excluding the terminating \0.
+         */
+cont:
+        c = *p++;
+        for (spanp = s2; (sc = *spanp++) != 0;)
+                if (sc == c)
+                        goto cont;
+        return (p - 1 - s1);
+}