Add spice_strndup

Also, make str(n)dup handle NULL correctly

2 files changed, 19 insertions, 0 deletions

diff --git a/common/mem.c b/common/mem.c
index ad0cccf6..56b37157 100644
--- a/common/mem.c
+++ b/common/mem.c
@@ -32,11 +32,29 @@ char *spice_strdup(const char *str)
 {
     char *copy;
 
+    if (str == NULL) {
+        return NULL;
+    }
+
     copy = (char *)spice_malloc(strlen(str) + 1);
     strcpy(copy, str);
     return copy;
 }
 
+char *spice_strndup(const char *str, size_t n_bytes)
+{
+    char *copy;
+
+    if (str == NULL) {
+        return NULL;
+    }
+
+    copy = (char *)spice_malloc(n_bytes + 1);
+    strncpy(copy, str, n_bytes);
+    copy[n_bytes] = 0;
+    return copy;
+}
+
 void *spice_memdup(const void *mem, size_t n_bytes)
 {
     void *copy;
diff --git a/common/mem.h b/common/mem.h
index f5fab20a..350e421e 100644
--- a/common/mem.h
+++ b/common/mem.h
@@ -23,6 +23,7 @@
 #include <spice/macros.h>
 
 char *spice_strdup(const char *str) SPICE_GNUC_MALLOC;
+char *spice_strndup(const char *str, size_t n_bytes) SPICE_GNUC_MALLOC;
 void *spice_memdup(const void *mem, size_t n_bytes) SPICE_GNUC_MALLOC;
 void *spice_malloc(size_t n_bytes) SPICE_GNUC_MALLOC SPICE_GNUC_ALLOC_SIZE(1);
 void *spice_malloc0(size_t n_bytes) SPICE_GNUC_MALLOC SPICE_GNUC_ALLOC_SIZE(1);