Added a function strzcpy which works the same as strncpy,
but guaranteed to produce the trailing null character.
Signed-off-by: Rickard Strandqvist <rickard_strandqv...@spectrumdigital.se>
---
include/linux/string.h | 1 +
lib/string.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/include/linux/string.h b/include/linux/string.h
index d36977e..d789ee5e 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -22,6 +22,7 @@ extern char * strcpy(char *,const char *);
#ifndef __HAVE_ARCH_STRNCPY
extern char * strncpy(char *,const char *, __kernel_size_t);
#endif
+extern char *strzcpy(char *, const char *, __kernel_size_t);
#ifndef __HAVE_ARCH_STRLCPY
size_t strlcpy(char *, const char *, size_t);
#endif
diff --git a/lib/string.c b/lib/string.c
index f3c6ff5..582a832 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -134,6 +134,37 @@ char *strncpy(char *dest, const char *src, size_t count)
EXPORT_SYMBOL(strncpy);
#endif
+/**
+ * strzcpy - Copy a length-limited, C-string
+ * @dest: Where to copy the string to
+ * @src: Where to copy the string from
+ * @count: The maximum number of bytes to copy
+ *
+ * The result is %NUL-terminated,
+ * as long as count is greater than zero.
+ *
+ * In the case where the length of @src is less than that of
+ * count, the remainder of @dest will be padded with %NUL.
+ *
+ */
+char *strzcpy(char *dest, const char *src, size_t count)
+{
+ char *tmp = dest;
+
+ while (count) {
+ if ((*tmp = *src) != 0)
+ src++;
+ tmp++;
+ count--;
+ }
+
+ if (dest != tmp)
+ *--tmp = '\0';
+
+ return dest;
+}
+EXPORT_SYMBOL(strzcpy);
+
#ifndef __HAVE_ARCH_STRLCPY
/**
* strlcpy - Copy a C-string into a sized buffer
--
1.7.10.4
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