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[Xen-devel] [PATCH v7 7/9] libxl: copy function for builtin types



These functions will be used in later patch to deep-copy a structure.

Functions introduced:
 * libxl_string_list_copy
 * libxl_key_value_list_copy
 * libxl_hwcap_copy
 * libxl_mac_copy
 * libxl_cpuid_policy_list_copy
 * libxl_string_copy
 * libxl_bitmap_copy_alloc

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 tools/libxl/libxl.c         |   67 +++++++++++++++++++++++++++++++++++++++++++
 tools/libxl/libxl.h         |   12 ++++++++
 tools/libxl/libxl_cpuid.c   |   33 +++++++++++++++++++++
 tools/libxl/libxl_nocpuid.c |    6 ++++
 tools/libxl/libxl_utils.c   |   25 ++++++++++++++++
 tools/libxl/libxl_utils.h   |    4 +++
 6 files changed, 147 insertions(+)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 1b0b08f..e355e20 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -205,6 +205,29 @@ void libxl_string_list_dispose(libxl_string_list *psl)
     free(sl);
 }
 
+void libxl_string_list_copy(libxl_ctx *ctx,
+                            libxl_string_list *dst,
+                            libxl_string_list *src)
+{
+    GC_INIT(ctx);
+    int i, len;
+
+    if (!*src) {
+        *dst = NULL;
+        goto out;
+    }
+
+    len = libxl_string_list_length(src);
+    /* one extra slot for sentinel */
+    *dst = libxl__calloc(NOGC, len + 1, sizeof(char *));
+
+    for (i = 0; i < len; i++)
+        (*dst)[i] = libxl__strdup(NOGC, (*src)[i]);
+
+out:
+    GC_FREE;
+}
+
 int libxl_string_list_length(const libxl_string_list *psl)
 {
     int i = 0;
@@ -245,6 +268,34 @@ void libxl_key_value_list_dispose(libxl_key_value_list 
*pkvl)
     free(kvl);
 }
 
+void libxl_key_value_list_copy(libxl_ctx *ctx,
+                               libxl_key_value_list *dst,
+                               libxl_key_value_list *src)
+{
+    GC_INIT(ctx);
+    int i, len;
+
+    if (*src == NULL) {
+        *dst = NULL;
+        goto out;
+    }
+
+    len = libxl_key_value_list_length(src);
+    /* one extra slot for sentinel */
+    *dst = libxl__calloc(NOGC, len * 2 + 1, sizeof(char *));
+
+    for (i = 0; i < len * 2; i += 2) {
+        (*dst)[i] = libxl__strdup(NOGC, (*src)[i]);
+        if ((*src)[i+1])
+            (*dst)[i+1] = libxl__strdup(NOGC, (*src)[i+1]);
+        else
+            (*dst)[i+1] = NULL;
+    }
+
+out:
+    GC_FREE;
+}
+
 void libxl_defbool_set(libxl_defbool *db, bool b)
 {
     db->val = b ? LIBXL__DEFBOOL_TRUE : LIBXL__DEFBOOL_FALSE;
@@ -5690,6 +5741,22 @@ int libxl_fd_set_cloexec(libxl_ctx *ctx, int fd, int 
cloexec)
 int libxl_fd_set_nonblock(libxl_ctx *ctx, int fd, int nonblock)
   { return fd_set_flags(ctx,fd, F_GETFL,F_SETFL,"FL", O_NONBLOCK, nonblock); }
 
+
+void libxl_hwcap_copy(libxl_ctx *ctx,libxl_hwcap *dst, libxl_hwcap *src)
+{
+    int i;
+
+    for (i = 0; i < 8; i++)
+        (*dst)[i] = (*src)[i];
+}
+
+void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, libxl_mac *src)
+{
+    int i;
+
+    for (i = 0; i < 6; i++)
+        (*dst)[i] = (*src)[i];
+}
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index e52a43f..1fb365d 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -542,20 +542,29 @@ typedef struct libxl__ctx libxl_ctx;
  */
 #define LIBXL_HAVE_CPUPOOL_NAME 1
 
+typedef struct libxl__ctx libxl_ctx;
+
 typedef uint8_t libxl_mac[6];
 #define LIBXL_MAC_FMT "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx"
 #define LIBXL_MAC_FMTLEN ((2*6)+5) /* 6 hex bytes plus 5 colons */
 #define LIBXL_MAC_BYTES(mac) mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]
+void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, libxl_mac *src);
 
 typedef char **libxl_string_list;
 void libxl_string_list_dispose(libxl_string_list *sl);
 int libxl_string_list_length(const libxl_string_list *sl);
+void libxl_string_list_copy(libxl_ctx *ctx, libxl_string_list *dst,
+                            libxl_string_list *src);
 
 typedef char **libxl_key_value_list;
 void libxl_key_value_list_dispose(libxl_key_value_list *kvl);
 int libxl_key_value_list_length(libxl_key_value_list *kvl);
+void libxl_key_value_list_copy(libxl_ctx *ctx,
+                               libxl_key_value_list *dst,
+                               libxl_key_value_list *src);
 
 typedef uint32_t libxl_hwcap[8];
+void libxl_hwcap_copy(libxl_ctx *ctx, libxl_hwcap *dst, libxl_hwcap *src);
 
 typedef uint64_t libxl_ev_user;
 
@@ -574,6 +583,9 @@ typedef struct libxl__cpuid_policy libxl_cpuid_policy;
 typedef libxl_cpuid_policy * libxl_cpuid_policy_list;
 void libxl_cpuid_dispose(libxl_cpuid_policy_list *cpuid_list);
 int libxl_cpuid_policy_list_length(libxl_cpuid_policy_list *l);
+void libxl_cpuid_policy_list_copy(libxl_ctx *ctx,
+                                  libxl_cpuid_policy_list *dst,
+                                  libxl_cpuid_policy_list *src);
 
 #define LIBXL_PCI_FUNC_ALL (~0U)
 
diff --git a/tools/libxl/libxl_cpuid.c b/tools/libxl/libxl_cpuid.c
index 1f2bcd5..f3e67ab 100644
--- a/tools/libxl/libxl_cpuid.c
+++ b/tools/libxl/libxl_cpuid.c
@@ -468,6 +468,39 @@ int libxl_cpuid_policy_list_length(libxl_cpuid_policy_list 
*pl)
     return i;
 }
 
+void libxl_cpuid_policy_list_copy(libxl_ctx *ctx,
+                                  libxl_cpuid_policy_list *dst,
+                                  libxl_cpuid_policy_list *src)
+{
+    GC_INIT(ctx);
+    int i, j, len;
+
+    if (*src == NULL) {
+        *dst = NULL;
+        goto out;
+    }
+
+    len = libxl_cpuid_policy_list_length(src);
+    /* one extra slot for sentinel */
+    *dst = libxl__calloc(NOGC, len + 1, sizeof(libxl_cpuid_policy));
+    (*dst)[len].input[0] = XEN_CPUID_INPUT_UNUSED;
+    (*dst)[len].input[1] = XEN_CPUID_INPUT_UNUSED;
+
+    for (i = 0; i < len; i++) {
+        for (j = 0; j < 2; j++)
+            (*dst)[i].input[j] = (*src)[i].input[j];
+        for (j = 0; j < 4; j++)
+            if ((*src)[i].policy[j])
+                (*dst)[i].policy[j] =
+                    libxl__strdup(NOGC, (*src)[i].policy[j]);
+            else
+                (*dst)[i].policy[j] = NULL;
+    }
+
+out:
+    GC_FREE;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxl/libxl_nocpuid.c b/tools/libxl/libxl_nocpuid.c
index eb525fc..698d252 100644
--- a/tools/libxl/libxl_nocpuid.c
+++ b/tools/libxl/libxl_nocpuid.c
@@ -51,6 +51,12 @@ int libxl_cpuid_policy_list_parse_json(libxl__gc *gc,
     return 0;
 }
 
+void libxl_cpuid_policy_list_copy(libxl_ctx *ctx,
+                                  libxl_cpuid_policy_list *dst,
+                                  libxl_cpuid_policy_list *src)
+{
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxl/libxl_utils.c b/tools/libxl/libxl_utils.c
index 16b734e..6053017 100644
--- a/tools/libxl/libxl_utils.c
+++ b/tools/libxl/libxl_utils.c
@@ -614,6 +614,19 @@ void libxl_bitmap_copy(libxl_ctx *ctx, libxl_bitmap *dptr,
     memcpy(dptr->map, sptr->map, sz * sizeof(*dptr->map));
 }
 
+void libxl_bitmap_copy_alloc(libxl_ctx *ctx,
+                             libxl_bitmap *dptr,
+                             const libxl_bitmap *sptr)
+{
+    GC_INIT(ctx);
+
+    dptr->map = libxl__calloc(NOGC, sptr->size, sizeof(*sptr->map));
+    dptr->size = sptr->size;
+    memcpy(dptr->map, sptr->map, sptr->size * sizeof(*sptr->map));
+
+    GC_FREE;
+}
+
 int libxl_bitmap_is_full(const libxl_bitmap *bitmap)
 {
     int i;
@@ -1013,6 +1026,18 @@ int libxl_domid_valid_guest(uint32_t domid)
     return domid > 0 && domid < DOMID_FIRST_RESERVED;
 }
 
+void libxl_string_copy(libxl_ctx *ctx, char **dst, char **src)
+{
+    GC_INIT(ctx);
+
+    if (*src)
+        *dst = libxl__strdup(NOGC, *src);
+    else
+        *dst = NULL;
+
+    GC_FREE;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxl/libxl_utils.h b/tools/libxl/libxl_utils.h
index 8bfb81b..cc528d2 100644
--- a/tools/libxl/libxl_utils.h
+++ b/tools/libxl/libxl_utils.h
@@ -76,6 +76,8 @@ int libxl_devid_to_device_vtpm(libxl_ctx *ctx, uint32_t domid,
 int libxl_bitmap_alloc(libxl_ctx *ctx, libxl_bitmap *bitmap, int n_bits);
     /* Allocated bimap is from malloc, libxl_bitmap_dispose() to be
      * called by the application when done. */
+void libxl_bitmap_copy_alloc(libxl_ctx *ctx, libxl_bitmap *dptr,
+                             const libxl_bitmap *sptr);
 void libxl_bitmap_copy(libxl_ctx *ctx, libxl_bitmap *dptr,
                        const libxl_bitmap *sptr);
 int libxl_bitmap_is_full(const libxl_bitmap *bitmap);
@@ -121,6 +123,8 @@ int libxl_cpumap_to_nodemap(libxl_ctx *ctx,
     return (s + 1023) / 1024;
 }
 
+void libxl_string_copy(libxl_ctx *ctx, char **dst, char **src);
+
 #endif
 
 /*
-- 
1.7.10.4


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