I implemented this while trying to import mmc-utils into barebox. While
I didn't finish this import this function might still be useful for
someone?!
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
---
include/linux/string.h | 3 +++
lib/string.c | 20 ++++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/include/linux/string.h b/include/linux/string.h
index 5df8c50e579a..ed4eeb5519e6 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -80,6 +80,9 @@ extern __kernel_size_t strnlen(const char *,__kernel_size_t);
#ifndef __HAVE_ARCH_STRDUP
extern char * strdup(const char *);
#endif
+#ifndef __HAVE_ARCH_STRNDUP
+extern char *strndup(const char *, size_t);
+#endif
#ifndef __HAVE_ARCH_STRSWAB
extern char * strswab(const char *);
#endif
diff --git a/lib/string.c b/lib/string.c
index 1d491c9c2fb5..f588933e8191 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -323,6 +323,26 @@ char * strdup(const char *s)
#endif
EXPORT_SYMBOL(strdup);
+#ifndef __HAVE_ARCH_STRNDUP
+char *strndup(const char *s, size_t n)
+{
+ char *new;
+ size_t len = strnlen(s, n);
+
+ if ((s == NULL) ||
+ ((new = malloc(len + 1)) == NULL)) {
+ return NULL;
+ }
+
+ memcpy(new, s, len);
+ new[len] = '\0';
+
+ return new;
+}
+
+#endif
+EXPORT_SYMBOL(strndup);
+
#ifndef __HAVE_ARCH_STRSPN
/**
* strspn - Calculate the length of the initial substring of @s which only
--
2.11.0
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