[xen staging] lib: move strchr()

[patchbot@xxxxxxx]

commit 7095953455001bb2d95792bb0b9c822e479b1c57
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Apr 22 14:50:25 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Apr 22 14:50:25 2021 +0200

    lib: move strchr()
    
    Allow the function to be individually linkable, discardable, and
    overridable.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/common/string.c | 15 ---------------
 xen/lib/Makefile    |  1 +
 xen/lib/strchr.c    | 28 ++++++++++++++++++++++++++++
 3 files changed, 29 insertions(+), 15 deletions(-)

diff --git a/xen/common/string.c b/xen/common/string.c
index 6042262b49..f433b15afd 100644
--- a/xen/common/string.c
+++ b/xen/common/string.c
@@ -56,21 +56,6 @@ int (strcasecmp)(const char *s1, const char *s2)
 }
 #endif
 
-#ifndef __HAVE_ARCH_STRCHR
-/**
- * strchr - Find the first occurrence of a character in a string
- * @s: The string to be searched
- * @c: The character to search for
- */
-char *(strchr)(const char *s, int c)
-{
-       for(; *s != (char) c; ++s)
-               if (*s == '\0')
-                       return NULL;
-       return (char *) s;
-}
-#endif
-
 #ifndef __HAVE_ARCH_STRRCHR
 /**
  * strrchr - Find the last occurrence of a character in a string
diff --git a/xen/lib/Makefile b/xen/lib/Makefile
index 0c6c726adf..b69b516369 100644
--- a/xen/lib/Makefile
+++ b/xen/lib/Makefile
@@ -14,6 +14,7 @@ lib-y += muldiv64.o
 lib-y += parse-size.o
 lib-y += rbtree.o
 lib-y += sort.o
+lib-y += strchr.o
 lib-y += strcmp.o
 lib-y += strlcat.o
 lib-y += strlcpy.o
diff --git a/xen/lib/strchr.c b/xen/lib/strchr.c
new file mode 100644
index 0000000000..2eba3f1574
--- /dev/null
+++ b/xen/lib/strchr.c
@@ -0,0 +1,28 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <xen/string.h>
+
+/**
+ * strchr - Find the first occurrence of a character in a string
+ * @s: The string to be searched
+ * @c: The character to search for
+ */
+char *(strchr)(const char *s, int c)
+{
+       for(; *s != (char) c; ++s)
+               if (*s == '\0')
+                       return NULL;
+       return (char *) s;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ */
--
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