This patch adds optional support for strndup.
Signed-off-by: Grant Erickson marathon96@gmail.com --- include/linux/string.h | 3 +++ lib/string.c | 21 +++++++++++++++++++++ 2 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/include/linux/string.h b/include/linux/string.h index 6239039..5668290 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -59,6 +59,9 @@ 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 *,__kernel_size_t); +#endif #ifndef __HAVE_ARCH_STRSWAB extern char * strswab(const char *); #endif diff --git a/lib/string.c b/lib/string.c index 2c4f0ec..5fb6693 100644 --- a/lib/string.c +++ b/lib/string.c @@ -260,6 +260,27 @@ char * strdup(const char *s) } #endif
+#ifndef __HAVE_ARCH_STRNDUP +char * strndup(const char *s, size_t n) +{ + size_t len; + char *new; + + len = strnlen(s, n); + + if ((s == NULL) || + ((new = malloc (len + 1)) == NULL) ) { + return NULL; + } + + strncpy (new, s, len); + + new[len] = '\0'; + + return new; +} +#endif + #ifndef __HAVE_ARCH_STRSPN /** * strspn - Calculate the length of the initial substring of @s which only