qemu-option.h

   1 /*
   2  * Commandline option parsing functions
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2009 Kevin Wolf <kwolf@redhat.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #ifndef QEMU_OPTIONS_H
  27 #define QEMU_OPTIONS_H
  28
  29 #include <stdint.h>
  30 #include "qemu-queue.h"
  31 #include "qapi/error.h"
  32 #include "qapi/qmp/qdict.h"
  33
  34 enum QEMUOptionParType {
  35     OPT_FLAG,
  36     OPT_NUMBER,
  37     OPT_SIZE,
  38     OPT_STRING,
  39 };
  40
  41 typedef struct QEMUOptionParameter {
  42     const char *name;
  43     enum QEMUOptionParType type;
  44     union {
  45         uint64_t n;
  46         char* s;
  47     } value;
  48     const char *help;
  49 } QEMUOptionParameter;
  50
  51
  52 const char *get_opt_name(char *buf, int buf_size, const char *p, char delim);
  53 const char *get_opt_value(char *buf, int buf_size, const char *p);
  54 int get_next_param_value(char *buf, int buf_size,
  55                          const char *tag, const char **pstr);
  56 int get_param_value(char *buf, int buf_size,
  57                     const char *tag, const char *str);
  58 int check_params(char *buf, int buf_size,
  59                  const char * const *params, const char *str);
  60
  61
  62 /*
  63  * The following functions take a parameter list as input. This is a pointer to
  64  * the first element of a QEMUOptionParameter array which is terminated by an
  65  * entry with entry->name == NULL.
  66  */
  67
  68 QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
  69     const char *name);
  70 int set_option_parameter(QEMUOptionParameter *list, const char *name,
  71     const char *value);
  72 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
  73     uint64_t value);
  74 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
  75     QEMUOptionParameter *list);
  76 QEMUOptionParameter *parse_option_parameters(const char *param,
  77     QEMUOptionParameter *list, QEMUOptionParameter *dest);
  78 void free_option_parameters(QEMUOptionParameter *list);
  79 void print_option_parameters(QEMUOptionParameter *list);
  80 void print_option_help(QEMUOptionParameter *list);
  81
  82 /* ------------------------------------------------------------------ */
  83
  84 typedef struct QemuOpt QemuOpt;
  85 typedef struct QemuOpts QemuOpts;
  86 typedef struct QemuOptsList QemuOptsList;
  87
  88 enum QemuOptType {
  89     QEMU_OPT_STRING = 0,  /* no parsing (use string as-is)                        */
  90     QEMU_OPT_BOOL,        /* on/off                                               */
  91     QEMU_OPT_NUMBER,      /* simple number                                        */
  92     QEMU_OPT_SIZE,        /* size, accepts (K)ilo, (M)ega, (G)iga, (T)era postfix */
  93 };
  94
  95 typedef struct QemuOptDesc {
  96     const char *name;
  97     enum QemuOptType type;
  98     const char *help;
  99 } QemuOptDesc;
 100
 101 struct QemuOptsList {
 102     const char *name;
 103     const char *implied_opt_name;
 104     bool merge_lists;  /* Merge multiple uses of option into a single list? */
 105     QTAILQ_HEAD(, QemuOpts) head;
 106     QemuOptDesc desc[];
 107 };
 108
 109 const char *qemu_opt_get(QemuOpts *opts, const char *name);
 110 /**
 111  * qemu_opt_has_help_opt:
 112  * @opts: options to search for a help request
 113  *
 114  * Check whether the options specified by @opts include one of the
 115  * standard strings which indicate that the user is asking for a
 116  * list of the valid values for a command line option (as defined
 117  * by is_help_option()).
 118  *
 119  * Returns: true if @opts includes 'help' or equivalent.
 120  */
 121 bool qemu_opt_has_help_opt(QemuOpts *opts);
 122 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval);
 123 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval);
 124 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval);
 125 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value);
 126 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
 127                       Error **errp);
 128 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val);
 129 int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val);
 130 typedef int (*qemu_opt_loopfunc)(const char *name, const char *value, void *opaque);
 131 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 132                      int abort_on_failure);
 133
 134 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id);
 135 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 136                            int fail_if_exists, Error **errp);
 137 QemuOpts *qemu_opts_create_nofail(QemuOptsList *list);
 138 void qemu_opts_reset(QemuOptsList *list);
 139 void qemu_opts_loc_restore(QemuOpts *opts);
 140 int qemu_opts_set(QemuOptsList *list, const char *id,
 141                   const char *name, const char *value);
 142 const char *qemu_opts_id(QemuOpts *opts);
 143 void qemu_opts_del(QemuOpts *opts);
 144 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp);
 145 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname);
 146 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params, int permit_abbrev);
 147 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 148                             int permit_abbrev);
 149 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
 150                                Error **errp);
 151 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict);
 152
 153 typedef int (*qemu_opts_loopfunc)(QemuOpts *opts, void *opaque);
 154 int qemu_opts_print(QemuOpts *opts, void *dummy);
 155 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
 156                       int abort_on_failure);
 157
 158 #endif