lib/string/strchr/: stp[c]spn(), strrspn(), strnul(): Add macros and functions

Often, a pointer is more useful than a length when calling these. Link: <https://docs.oracle.com/cd/E86824_01/html/E54769/strrspn-3gen.html> Signed-off-by: Alejandro Colomar <alx@kernel.org>
2024-05-18 20:41:30 +02:00
parent b38ee0c6d0
commit 2fcf520184
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+// SPDX-FileCopyrightText: 2024, Alejandro Colomar <alx@kernel.org>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#ifndef SHADOW_INCLUDE_LIB_STRING_STRCHR_STPCSPN_H_
+#define SHADOW_INCLUDE_LIB_STRING_STRCHR_STPCSPN_H_
+
+
+#include <config.h>
+
+#include <string.h>
+
+#include "attr.h"
+
+
+// Similar to strcspn(3), but return a pointer instead of an offset.
+// Similar to strchrnul(3), but search for several delimiters.
+// Similar to strpbrk(3), but return 's + strlen(s)' if not found.
+#define stpcspn(s, reject)                                                    \
+({                                                                            \
+	__auto_type  s_ = s;                                                  \
+                                                                              \
+	s_ + strcspn(s_, reject);                                             \
+})
+
+
+#endif  // include guard