qapi/qapi-util.c

   1 /*
   2  * QAPI util functions
   3  *
   4  * Authors:
   5  *  Hu Tao       <hutao@cn.fujitsu.com>
   6  *  Peter Lieven <pl@kamp.de>
   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/ctype.h"
  16
  17 const char *qapi_enum_lookup(const QEnumLookup *lookup, int val)
  18 {
  19     assert(val >= 0 && val < lookup->size);
  20
  21     return lookup->array[val];
  22 }
  23
  24 int qapi_enum_parse(const QEnumLookup *lookup, const char *buf,
  25                     int def, Error **errp)
  26 {
  27     int i;
  28
  29     if (!buf) {
  30         return def;
  31     }
  32
  33     for (i = 0; i < lookup->size; i++) {
  34         if (!strcmp(buf, lookup->array[i])) {
  35             return i;
  36         }
  37     }
  38
  39     error_setg(errp, "invalid parameter value: %s", buf);
  40     return def;
  41 }
  42
  43 /*
  44  * Parse a valid QAPI name from @str.
  45  * A valid name consists of letters, digits, hyphen and underscore.
  46  * It may be prefixed by __RFQDN_ (downstream extension), where RFQDN
  47  * may contain only letters, digits, hyphen and period.
  48  * The special exception for enumeration names is not implemented.
  49  * See docs/devel/qapi-code-gen.txt for more on QAPI naming rules.
  50  * Keep this consistent with scripts/qapi.py!
  51  * If @complete, the parse fails unless it consumes @str completely.
  52  * Return its length on success, -1 on failure.
  53  */
  54 int parse_qapi_name(const char *str, bool complete)
  55 {
  56     const char *p = str;
  57
  58     if (*p == '_') {            /* Downstream __RFQDN_ */
  59         p++;
  60         if (*p != '_') {
  61             return -1;
  62         }
  63         while (*++p) {
  64             if (!qemu_isalnum(*p) && *p != '-' && *p != '.') {
  65                 break;
  66             }
  67         }
  68
  69         if (*p != '_') {
  70             return -1;
  71         }
  72         p++;
  73     }
  74
  75     if (!qemu_isalpha(*p)) {
  76         return -1;
  77     }
  78     while (*++p) {
  79         if (!qemu_isalnum(*p) && *p != '-' && *p != '_') {
  80             break;
  81         }
  82     }
  83
  84     if (complete && *p) {
  85         return -1;
  86     }
  87     return p - str;
  88 }