1 files changed, 61 insertions, 0 deletions

diff --git a/src/lib/libc/string/strcspn.c b/src/lib/libc/string/strcspn.c
new file mode 100644
index 0000000000..f96f903809
--- /dev/null
+++ b/src/lib/libc/string/strcspn.c
@@ -0,0 +1,61 @@
+/*-
+ * Copyright (c) 1990 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 *rcsid = "$OpenBSD: strcspn.c,v 1.4 2003/06/11 21:08:16 deraadt Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <string.h>
+
+/*
+ * Span the complement of string s2.
+ */
+size_t
+strcspn(const char *s1, const char *s2)
+{
+        const char *p, *spanp;
+        char c, sc;
+
+        /*
+         * Stop as soon as we find any character from s2.  Note that there
+         * must be a NUL in s2; it suffices to stop when we find that, too.
+         */
+        for (p = s1;;) {
+                c = *p++;
+                spanp = s2;
+                do {
+                        if ((sc = *spanp++) == c)
+                                return (p - 1 - s1);
+                } while (sc != 0);
+        }
+        /* NOTREACHED */
+}