error.c

   1 /*
   2  * QEMU Error Objects
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU LGPL, version 2.  See
  10  * the COPYING.LIB file in the top-level directory.
  11  */
  12
  13 #include "qemu-common.h"
  14 #include "error.h"
  15 #include "qjson.h"
  16 #include "qdict.h"
  17 #include "qapi-types.h"
  18 #include "qerror.h"
  19
  20 struct Error
  21 {
  22     char *msg;
  23     ErrorClass err_class;
  24 };
  25
  26 void error_set(Error **errp, ErrorClass err_class, const char *fmt, ...)
  27 {
  28     Error *err;
  29     va_list ap;
  30
  31     if (errp == NULL) {
  32         return;
  33     }
  34     assert(*errp == NULL);
  35
  36     err = g_malloc0(sizeof(*err));
  37
  38     va_start(ap, fmt);
  39     err->msg = g_strdup_vprintf(fmt, ap);
  40     va_end(ap);
  41     err->err_class = err_class;
  42
  43     *errp = err;
  44 }
  45
  46 Error *error_copy(const Error *err)
  47 {
  48     Error *err_new;
  49
  50     err_new = g_malloc0(sizeof(*err));
  51     err_new->msg = g_strdup(err->msg);
  52     err_new->err_class = err->err_class;
  53
  54     return err_new;
  55 }
  56
  57 bool error_is_set(Error **errp)
  58 {
  59     return (errp && *errp);
  60 }
  61
  62 ErrorClass error_get_class(const Error *err)
  63 {
  64     return err->err_class;
  65 }
  66
  67 const char *error_get_pretty(Error *err)
  68 {
  69     return err->msg;
  70 }
  71
  72 void error_free(Error *err)
  73 {
  74     if (err) {
  75         g_free(err->msg);
  76         g_free(err);
  77     }
  78 }
  79
  80 void error_propagate(Error **dst_err, Error *local_err)
  81 {
  82     if (dst_err && !*dst_err) {
  83         *dst_err = local_err;
  84     } else if (local_err) {
  85         error_free(local_err);
  86     }
  87 }