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