qapi/string-input-visitor.c

   1 /*
   2  * String parsing visitor
   3  *
   4  * Copyright Red Hat, Inc. 2012
   5  *
   6  * Author: Paolo Bonzini <pbonzini@redhat.com>
   7  *
   8  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
   9  * See the COPYING.LIB file in the top-level directory.
  10  *
  11  */
  12
  13 #include "qemu-common.h"
  14 #include "qapi/string-input-visitor.h"
  15 #include "qapi/visitor-impl.h"
  16 #include "qapi/qmp/qerror.h"
  17 #include "qemu/option.h"
  18
  19 struct StringInputVisitor
  20 {
  21     Visitor visitor;
  22     const char *string;
  23 };
  24
  25 static void parse_type_int(Visitor *v, int64_t *obj, const char *name,
  26                            Error **errp)
  27 {
  28     StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
  29     char *endp = (char *) siv->string;
  30     long long val;
  31
  32     errno = 0;
  33     if (siv->string) {
  34         val = strtoll(siv->string, &endp, 0);
  35     }
  36     if (!siv->string || errno || endp == siv->string || *endp) {
  37         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
  38                   "integer");
  39         return;
  40     }
  41
  42     *obj = val;
  43 }
  44
  45 static void parse_type_size(Visitor *v, uint64_t *obj, const char *name,
  46                             Error **errp)
  47 {
  48     StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
  49     Error *err = NULL;
  50     uint64_t val;
  51
  52     if (siv->string) {
  53         parse_option_size(name, siv->string, &val, &err);
  54     } else {
  55         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
  56                   "size");
  57         return;
  58     }
  59     if (err) {
  60         error_propagate(errp, err);
  61         return;
  62     }
  63
  64     *obj = val;
  65 }
  66
  67 static void parse_type_bool(Visitor *v, bool *obj, const char *name,
  68                             Error **errp)
  69 {
  70     StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
  71
  72     if (siv->string) {
  73         if (!strcasecmp(siv->string, "on") ||
  74             !strcasecmp(siv->string, "yes") ||
  75             !strcasecmp(siv->string, "true")) {
  76             *obj = true;
  77             return;
  78         }
  79         if (!strcasecmp(siv->string, "off") ||
  80             !strcasecmp(siv->string, "no") ||
  81             !strcasecmp(siv->string, "false")) {
  82             *obj = false;
  83             return;
  84         }
  85     }
  86
  87     error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
  88               "boolean");
  89 }
  90
  91 static void parse_type_str(Visitor *v, char **obj, const char *name,
  92                            Error **errp)
  93 {
  94     StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
  95     if (siv->string) {
  96         *obj = g_strdup(siv->string);
  97     } else {
  98         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
  99                   "string");
 100     }
 101 }
 102
 103 static void parse_type_number(Visitor *v, double *obj, const char *name,
 104                               Error **errp)
 105 {
 106     StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
 107     char *endp = (char *) siv->string;
 108     double val;
 109
 110     errno = 0;
 111     if (siv->string) {
 112         val = strtod(siv->string, &endp);
 113     }
 114     if (!siv->string || errno || endp == siv->string || *endp) {
 115         error_set(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 116                   "number");
 117         return;
 118     }
 119
 120     *obj = val;
 121 }
 122
 123 static void parse_start_optional(Visitor *v, bool *present,
 124                                  const char *name, Error **errp)
 125 {
 126     StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
 127
 128     if (!siv->string) {
 129         *present = false;
 130         return;
 131     }
 132
 133     *present = true;
 134 }
 135
 136 Visitor *string_input_get_visitor(StringInputVisitor *v)
 137 {
 138     return &v->visitor;
 139 }
 140
 141 void string_input_visitor_cleanup(StringInputVisitor *v)
 142 {
 143     g_free(v);
 144 }
 145
 146 StringInputVisitor *string_input_visitor_new(const char *str)
 147 {
 148     StringInputVisitor *v;
 149
 150     v = g_malloc0(sizeof(*v));
 151
 152     v->visitor.type_enum = input_type_enum;
 153     v->visitor.type_int = parse_type_int;
 154     v->visitor.type_size = parse_type_size;
 155     v->visitor.type_bool = parse_type_bool;
 156     v->visitor.type_str = parse_type_str;
 157     v->visitor.type_number = parse_type_number;
 158     v->visitor.start_optional = parse_start_optional;
 159
 160     v->string = str;
 161     return v;
 162 }