This function is needed for the fixed length string feature in the state
framework.
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
include/xfuncs.h | 1 +
lib/xfuncs.c | 22 ++++++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/include/xfuncs.h b/include/xfuncs.h
index 8efc99dbc455..940a1d67ed1c 100644
--- a/include/xfuncs.h
+++ b/include/xfuncs.h
@@ -7,6 +7,7 @@ void *xmalloc(size_t size);
void *xrealloc(void *ptr, size_t size);
void *xzalloc(size_t size);
char *xstrdup(const char *s);
+char *xstrndup(const char *s, size_t size);
void* xmemalign(size_t alignment, size_t bytes);
void* xmemdup(const void *orig, size_t size);
diff --git a/lib/xfuncs.c b/lib/xfuncs.c
index 0e78b670a5d4..f0219c43a5ec 100644
--- a/lib/xfuncs.c
+++ b/lib/xfuncs.c
@@ -63,6 +63,28 @@ char *xstrdup(const char *s)
}
EXPORT_SYMBOL(xstrdup);
+char *xstrndup(const char *s, size_t n)
+{
+ int m;
+ char *t;
+
+ /* We can just xmalloc(n+1) and strncpy into it, */
+ /* but think about xstrndup("abc", 10000) wastage! */
+ m = n;
+ t = (char*) s;
+ while (m) {
+ if (!*t) break;
+ m--;
+ t++;
+ }
+ n -= m;
+ t = xmalloc(n + 1);
+ t[n] = '\0';
+
+ return memcpy(t, s, n);
+}
+EXPORT_SYMBOL(xstrndup);
+
void* xmemalign(size_t alignment, size_t bytes)
{
void *p = memalign(alignment, bytes);
--
2.1.4
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