qapi/string-input-visitor.c

   1 /*
   2  * String parsing visitor
   3  *
   4  * Copyright Red Hat, Inc. 2012-2016
   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/osdep.h"
  14 #include "qapi/error.h"
  15 #include "qemu-common.h"
  16 #include "qapi/string-input-visitor.h"
  17 #include "qapi/visitor-impl.h"
  18 #include "qapi/qmp/qerror.h"
  19 #include "qemu/option.h"
  20 #include "qemu/queue.h"
  21 #include "qemu/range.h"
  22
  23
  24 struct StringInputVisitor
  25 {
  26     Visitor visitor;
  27
  28     bool head;
  29
  30     GList *ranges;
  31     GList *cur_range;
  32     int64_t cur;
  33
  34     const char *string;
  35 };
  36
  37 static StringInputVisitor *to_siv(Visitor *v)
  38 {
  39     return container_of(v, StringInputVisitor, visitor);
  40 }
  41
  42 static void free_range(void *range, void *dummy)
  43 {
  44     g_free(range);
  45 }
  46
  47 static void parse_str(StringInputVisitor *siv, Error **errp)
  48 {
  49     char *str = (char *) siv->string;
  50     long long start, end;
  51     Range *cur;
  52     char *endptr;
  53
  54     if (siv->ranges) {
  55         return;
  56     }
  57
  58     do {
  59         errno = 0;
  60         start = strtoll(str, &endptr, 0);
  61         if (errno == 0 && endptr > str) {
  62             if (*endptr == '\0') {
  63                 cur = g_malloc0(sizeof(*cur));
  64                 cur->begin = start;
  65                 cur->end = start + 1;
  66                 siv->ranges = g_list_insert_sorted_merged(siv->ranges, cur,
  67                                                           range_compare);
  68                 cur = NULL;
  69                 str = NULL;
  70             } else if (*endptr == '-') {
  71                 str = endptr + 1;
  72                 errno = 0;
  73                 end = strtoll(str, &endptr, 0);
  74                 if (errno == 0 && endptr > str && start <= end &&
  75                     (start > INT64_MAX - 65536 ||
  76                      end < start + 65536)) {
  77                     if (*endptr == '\0') {
  78                         cur = g_malloc0(sizeof(*cur));
  79                         cur->begin = start;
  80                         cur->end = end + 1;
  81                         siv->ranges =
  82                             g_list_insert_sorted_merged(siv->ranges,
  83                                                         cur,
  84                                                         range_compare);
  85                         cur = NULL;
  86                         str = NULL;
  87                     } else if (*endptr == ',') {
  88                         str = endptr + 1;
  89                         cur = g_malloc0(sizeof(*cur));
  90                         cur->begin = start;
  91                         cur->end = end + 1;
  92                         siv->ranges =
  93                             g_list_insert_sorted_merged(siv->ranges,
  94                                                         cur,
  95                                                         range_compare);
  96                         cur = NULL;
  97                     } else {
  98                         goto error;
  99                     }
 100                 } else {
 101                     goto error;
 102                 }
 103             } else if (*endptr == ',') {
 104                 str = endptr + 1;
 105                 cur = g_malloc0(sizeof(*cur));
 106                 cur->begin = start;
 107                 cur->end = start + 1;
 108                 siv->ranges = g_list_insert_sorted_merged(siv->ranges,
 109                                                           cur,
 110                                                           range_compare);
 111                 cur = NULL;
 112             } else {
 113                 goto error;
 114             }
 115         } else {
 116             goto error;
 117         }
 118     } while (str);
 119
 120     return;
 121 error:
 122     g_list_foreach(siv->ranges, free_range, NULL);
 123     g_list_free(siv->ranges);
 124     siv->ranges = NULL;
 125 }
 126
 127 static void
 128 start_list(Visitor *v, const char *name, Error **errp)
 129 {
 130     StringInputVisitor *siv = to_siv(v);
 131
 132     parse_str(siv, errp);
 133
 134     siv->cur_range = g_list_first(siv->ranges);
 135     if (siv->cur_range) {
 136         Range *r = siv->cur_range->data;
 137         if (r) {
 138             siv->cur = r->begin;
 139         }
 140     }
 141 }
 142
 143 static GenericList *next_list(Visitor *v, GenericList **list, size_t size)
 144 {
 145     StringInputVisitor *siv = to_siv(v);
 146     GenericList **link;
 147     Range *r;
 148
 149     if (!siv->ranges || !siv->cur_range) {
 150         return NULL;
 151     }
 152
 153     r = siv->cur_range->data;
 154     if (!r) {
 155         return NULL;
 156     }
 157
 158     if (siv->cur < r->begin || siv->cur >= r->end) {
 159         siv->cur_range = g_list_next(siv->cur_range);
 160         if (!siv->cur_range) {
 161             return NULL;
 162         }
 163         r = siv->cur_range->data;
 164         if (!r) {
 165             return NULL;
 166         }
 167         siv->cur = r->begin;
 168     }
 169
 170     if (siv->head) {
 171         link = list;
 172         siv->head = false;
 173     } else {
 174         link = &(*list)->next;
 175     }
 176
 177     *link = g_malloc0(size);
 178     return *link;
 179 }
 180
 181 static void end_list(Visitor *v)
 182 {
 183     StringInputVisitor *siv = to_siv(v);
 184     siv->head = true;
 185 }
 186
 187 static void parse_type_int64(Visitor *v, const char *name, int64_t *obj,
 188                              Error **errp)
 189 {
 190     StringInputVisitor *siv = to_siv(v);
 191
 192     if (!siv->string) {
 193         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 194                    "integer");
 195         return;
 196     }
 197
 198     parse_str(siv, errp);
 199
 200     if (!siv->ranges) {
 201         goto error;
 202     }
 203
 204     if (!siv->cur_range) {
 205         Range *r;
 206
 207         siv->cur_range = g_list_first(siv->ranges);
 208         if (!siv->cur_range) {
 209             goto error;
 210         }
 211
 212         r = siv->cur_range->data;
 213         if (!r) {
 214             goto error;
 215         }
 216
 217         siv->cur = r->begin;
 218     }
 219
 220     *obj = siv->cur;
 221     siv->cur++;
 222     return;
 223
 224 error:
 225     error_setg(errp, QERR_INVALID_PARAMETER_VALUE, name,
 226                "an int64 value or range");
 227 }
 228
 229 static void parse_type_uint64(Visitor *v, const char *name, uint64_t *obj,
 230                               Error **errp)
 231 {
 232     /* FIXME: parse_type_int64 mishandles values over INT64_MAX */
 233     int64_t i;
 234     Error *err = NULL;
 235     parse_type_int64(v, name, &i, &err);
 236     if (err) {
 237         error_propagate(errp, err);
 238     } else {
 239         *obj = i;
 240     }
 241 }
 242
 243 static void parse_type_size(Visitor *v, const char *name, uint64_t *obj,
 244                             Error **errp)
 245 {
 246     StringInputVisitor *siv = to_siv(v);
 247     Error *err = NULL;
 248     uint64_t val;
 249
 250     if (siv->string) {
 251         parse_option_size(name, siv->string, &val, &err);
 252     } else {
 253         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 254                    "size");
 255         return;
 256     }
 257     if (err) {
 258         error_propagate(errp, err);
 259         return;
 260     }
 261
 262     *obj = val;
 263 }
 264
 265 static void parse_type_bool(Visitor *v, const char *name, bool *obj,
 266                             Error **errp)
 267 {
 268     StringInputVisitor *siv = to_siv(v);
 269
 270     if (siv->string) {
 271         if (!strcasecmp(siv->string, "on") ||
 272             !strcasecmp(siv->string, "yes") ||
 273             !strcasecmp(siv->string, "true")) {
 274             *obj = true;
 275             return;
 276         }
 277         if (!strcasecmp(siv->string, "off") ||
 278             !strcasecmp(siv->string, "no") ||
 279             !strcasecmp(siv->string, "false")) {
 280             *obj = false;
 281             return;
 282         }
 283     }
 284
 285     error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 286                "boolean");
 287 }
 288
 289 static void parse_type_str(Visitor *v, const char *name, char **obj,
 290                            Error **errp)
 291 {
 292     StringInputVisitor *siv = to_siv(v);
 293     if (siv->string) {
 294         *obj = g_strdup(siv->string);
 295     } else {
 296         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 297                    "string");
 298     }
 299 }
 300
 301 static void parse_type_number(Visitor *v, const char *name, double *obj,
 302                               Error **errp)
 303 {
 304     StringInputVisitor *siv = to_siv(v);
 305     char *endp = (char *) siv->string;
 306     double val;
 307
 308     errno = 0;
 309     if (siv->string) {
 310         val = strtod(siv->string, &endp);
 311     }
 312     if (!siv->string || errno || endp == siv->string || *endp) {
 313         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
 314                    "number");
 315         return;
 316     }
 317
 318     *obj = val;
 319 }
 320
 321 static void parse_optional(Visitor *v, const char *name, bool *present)
 322 {
 323     StringInputVisitor *siv = to_siv(v);
 324
 325     if (!siv->string) {
 326         *present = false;
 327         return;
 328     }
 329
 330     *present = true;
 331 }
 332
 333 Visitor *string_input_get_visitor(StringInputVisitor *v)
 334 {
 335     return &v->visitor;
 336 }
 337
 338 void string_input_visitor_cleanup(StringInputVisitor *v)
 339 {
 340     g_list_foreach(v->ranges, free_range, NULL);
 341     g_list_free(v->ranges);
 342     g_free(v);
 343 }
 344
 345 StringInputVisitor *string_input_visitor_new(const char *str)
 346 {
 347     StringInputVisitor *v;
 348
 349     v = g_malloc0(sizeof(*v));
 350
 351     v->visitor.type_enum = input_type_enum;
 352     v->visitor.type_int64 = parse_type_int64;
 353     v->visitor.type_uint64 = parse_type_uint64;
 354     v->visitor.type_size = parse_type_size;
 355     v->visitor.type_bool = parse_type_bool;
 356     v->visitor.type_str = parse_type_str;
 357     v->visitor.type_number = parse_type_number;
 358     v->visitor.start_list = start_list;
 359     v->visitor.next_list = next_list;
 360     v->visitor.end_list = end_list;
 361     v->visitor.optional = parse_optional;
 362
 363     v->string = str;
 364     v->head = true;
 365     return v;
 366 }