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-rw-r--r--libc/string/generic/strcspn.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/libc/string/generic/strcspn.c b/libc/string/generic/strcspn.c
new file mode 100644
index 000000000..c5d2d769d
--- /dev/null
+++ b/libc/string/generic/strcspn.c
@@ -0,0 +1,39 @@
+/* Copyright (C) 1991, 1994, 1996, 1997, 2003 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
+ 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.
+
+ The GNU C 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 the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <string.h>
+
+#undef strcspn
+
+/* Return the length of the maximum initial segment of S
+ which contains no characters from REJECT. */
+size_t
+strcspn (s, reject)
+ const char *s;
+ const char *reject;
+{
+ size_t count = 0;
+
+ while (*s != '\0')
+ if (strchr (reject, *s++) == NULL)
+ ++count;
+ else
+ return count;
+
+ return count;
+}