[Minios-devel] [UNIKRAFT PATCH v3 02/10] lib/nolibc: Add strndup and strdup functions

[Costin Lupu <costin.lupu@xxxxxxxxx>]

Port strdup function from Mini-OS.

Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
---
 lib/nolibc/exportsyms.uk    |  2 ++
 lib/nolibc/include/string.h |  2 ++
 lib/nolibc/string.c         | 22 ++++++++++++++++++++++
 3 files changed, 26 insertions(+)

diff --git a/lib/nolibc/exportsyms.uk b/lib/nolibc/exportsyms.uk
index 6492581..61d49c7 100644
--- a/lib/nolibc/exportsyms.uk
+++ b/lib/nolibc/exportsyms.uk
@@ -62,6 +62,8 @@ strcmp
 strcspn
 strspn
 strtok
+strndup
+strdup
 
 # time
 nanosleep
diff --git a/lib/nolibc/include/string.h b/lib/nolibc/include/string.h
index 1d63ae9..b21e2c1 100644
--- a/lib/nolibc/include/string.h
+++ b/lib/nolibc/include/string.h
@@ -61,6 +61,8 @@ int strcmp(const char *str1, const char *str2);
 size_t strcspn(const char *s, const char *c);
 size_t strspn(const char *s, const char *c);
 char *strtok(char *restrict s, const char *restrict sep);
+char *strndup(const char *str, size_t len);
+char *strdup(const char *str);
 
 #ifdef __cplusplus
 }
diff --git a/lib/nolibc/string.c b/lib/nolibc/string.c
index d4a6469..6f853ba 100644
--- a/lib/nolibc/string.c
+++ b/lib/nolibc/string.c
@@ -57,6 +57,7 @@
  * ----------------------------------------------------------------------
  */
 
+#include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
 #include <limits.h>
@@ -264,3 +265,24 @@ char *strtok(char *restrict s, const char *restrict sep)
                p = 0;
        return s;
 }
+
+char *strndup(const char *str, size_t len)
+{
+       char *__res;
+       int __len;
+
+       __len = strnlen(str, len);
+
+       __res = malloc(__len + 1);
+       if (__res) {
+               memcpy(__res, str, __len);
+               __res[__len] = '\0';
+       }
+
+       return __res;
+}
+
+char *strdup(const char *str)
+{
+       return strndup(str, SIZE_MAX);
+}
-- 
2.11.0


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