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authorriastradh <riastradh@NetBSD.org>2021-12-19 00:48:30 +0000
committerriastradh <riastradh@NetBSD.org>2021-12-19 00:48:30 +0000
commit34bd2372c7f8db3cd2f8c94face6a0bc70361f6b (patch)
treebdb3e6fc5626c9aa587d51f6631b1c93beb33a9f /sys/external/bsd/drm2/include/linux/string.h
parente5a638b191a9c5f0a135ce40cd9694b9bb2e0949 (diff)
Implement strscpy.
Diffstat (limited to 'sys/external/bsd/drm2/include/linux/string.h')
-rw-r--r--sys/external/bsd/drm2/include/linux/string.h24
1 files changed, 23 insertions, 1 deletions
diff --git a/sys/external/bsd/drm2/include/linux/string.h b/sys/external/bsd/drm2/include/linux/string.h
index d9ba6c5afdf..74298e553bb 100644
--- a/sys/external/bsd/drm2/include/linux/string.h
+++ b/sys/external/bsd/drm2/include/linux/string.h
@@ -1,4 +1,4 @@
-/* $NetBSD: string.h,v 1.5 2018/08/27 06:49:23 riastradh Exp $ */
+/* $NetBSD: string.h,v 1.6 2021/12/19 00:48:30 riastradh Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -34,6 +34,7 @@
#include <sys/types.h>
#include <sys/cdefs.h>
+#include <sys/errno.h>
#include <sys/null.h>
#include <linux/slab.h>
@@ -93,4 +94,25 @@ kstrdup(const char *src, gfp_t gfp)
return kstrndup(src, strlen(src), gfp);
}
+static inline ssize_t
+strscpy(char *dst, const char *src, size_t dstsize)
+{
+ size_t n = dstsize;
+
+ /* If no space for a NUL terminator, fail. */
+ if (n == 0)
+ return -E2BIG;
+
+ /* Copy until we get a NUL terminator or the end of the buffer. */
+ while ((*dst++ = *src++) != '\0') {
+ if (__predict_false(--n == 0)) {
+ dst[-1] = '\0'; /* NUL-terminate */
+ return -E2BIG;
+ }
+ }
+
+ /* Return the number of bytes copied, excluding NUL. */
+ return dstsize - n;
+}
+
#endif /* _LINUX_STRING_H_ */