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[tests] Add strpbr()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -3,7 +3,7 @@

 LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \

           strrchr.o strcat.o strncmp.o strncpy.o strncat.o strcoll.o \

-          strxfrm.o strtok.o strstr.o strspn.o strcspn.o \

+          strxfrm.o strtok.o strstr.o strspn.o strcspn.o strpbrk.o \

           memset.o memcpy.o memmove.o memcmp.o memchr.o \

           isalnum.o isalpha.o isascii.o isblank.o iscntrl.o isdigit.o \

           isgraph.o islower.o isprint.o ispunct.o isspace.o isupper.o \

--- /dev/null

+++ b/libc/src/strpbrk.c

@@ -1,0 +1,18 @@

+/* See LICENSE file for copyright and license details. */

+

+#include <string.h>

+

+char *

+strpbrk(const char *s1, const char *s2)

+{

+	int c;

+	const char *p;

+

+	for (; c = *s1; ++s1) {

+		for (p = s2; *p && *p != c; ++p)

+			/* nothing */;

+		if (*p == c)

+			return s1;

+	}

+	return NULL;

+}