include/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     bool assigned;
  50 } QEMUOptionParameter;
  51
  52
  53 const char *get_opt_name(char *buf, int buf_size, const char *p, char delim);
  54 const char *get_opt_value(char *buf, int buf_size, const char *p);
  55 int get_next_param_value(char *buf, int buf_size,
  56                          const char *tag, const char **pstr);
  57 int get_param_value(char *buf, int buf_size,
  58                     const char *tag, const char *str);
  59
  60
  61 /*
  62  * The following functions take a parameter list as input. This is a pointer to
  63  * the first element of a QEMUOptionParameter array which is terminated by an
  64  * entry with entry->name == NULL.
  65  */
  66
  67 QEMUOptionParameter *get_option_parameter(QEMUOptionParameter *list,
  68     const char *name);
  69 int set_option_parameter(QEMUOptionParameter *list, const char *name,
  70     const char *value);
  71 int set_option_parameter_int(QEMUOptionParameter *list, const char *name,
  72     uint64_t value);
  73 QEMUOptionParameter *append_option_parameters(QEMUOptionParameter *dest,
  74     QEMUOptionParameter *list);
  75 QEMUOptionParameter *parse_option_parameters(const char *param,
  76     QEMUOptionParameter *list, QEMUOptionParameter *dest);
  77 void parse_option_size(const char *name, const char *value,
  78                        uint64_t *ret, Error **errp);
  79 void free_option_parameters(QEMUOptionParameter *list);
  80 void print_option_parameters(QEMUOptionParameter *list);
  81 void print_option_help(QEMUOptionParameter *list);
  82
  83 /* ------------------------------------------------------------------ */
  84
  85 typedef struct QemuOpt QemuOpt;
  86 typedef struct QemuOpts QemuOpts;
  87 typedef struct QemuOptsList QemuOptsList;
  88
  89 enum QemuOptType {
  90     QEMU_OPT_STRING = 0,  /* no parsing (use string as-is)                        */
  91     QEMU_OPT_BOOL,        /* on/off                                               */
  92     QEMU_OPT_NUMBER,      /* simple number                                        */
  93     QEMU_OPT_SIZE,        /* size, accepts (K)ilo, (M)ega, (G)iga, (T)era postfix */
  94 };
  95
  96 typedef struct QemuOptDesc {
  97     const char *name;
  98     enum QemuOptType type;
  99     const char *help;
 100 } QemuOptDesc;
 101
 102 struct QemuOptsList {
 103     const char *name;
 104     const char *implied_opt_name;
 105     bool merge_lists;  /* Merge multiple uses of option into a single list? */
 106     QTAILQ_HEAD(, QemuOpts) head;
 107     QemuOptDesc desc[];
 108 };
 109
 110 const char *qemu_opt_get(QemuOpts *opts, const char *name);
 111 /**
 112  * qemu_opt_has_help_opt:
 113  * @opts: options to search for a help request
 114  *
 115  * Check whether the options specified by @opts include one of the
 116  * standard strings which indicate that the user is asking for a
 117  * list of the valid values for a command line option (as defined
 118  * by is_help_option()).
 119  *
 120  * Returns: true if @opts includes 'help' or equivalent.
 121  */
 122 bool qemu_opt_has_help_opt(QemuOpts *opts);
 123 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval);
 124 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval);
 125 uint64_t qemu_opt_get_size(QemuOpts *opts, const char *name, uint64_t defval);
 126 int qemu_opt_unset(QemuOpts *opts, const char *name);
 127 int qemu_opt_set(QemuOpts *opts, const char *name, const char *value);
 128 void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
 129                       Error **errp);
 130 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val);
 131 int qemu_opt_set_number(QemuOpts *opts, const char *name, int64_t val);
 132 typedef int (*qemu_opt_loopfunc)(const char *name, const char *value, void *opaque);
 133 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
 134                      int abort_on_failure);
 135
 136 QemuOpts *qemu_opts_find(QemuOptsList *list, const char *id);
 137 QemuOpts *qemu_opts_create(QemuOptsList *list, const char *id,
 138                            int fail_if_exists, Error **errp);
 139 QemuOpts *qemu_opts_create_nofail(QemuOptsList *list);
 140 void qemu_opts_reset(QemuOptsList *list);
 141 void qemu_opts_loc_restore(QemuOpts *opts);
 142 int qemu_opts_set(QemuOptsList *list, const char *id,
 143                   const char *name, const char *value);
 144 const char *qemu_opts_id(QemuOpts *opts);
 145 void qemu_opts_del(QemuOpts *opts);
 146 void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp);
 147 int qemu_opts_do_parse(QemuOpts *opts, const char *params, const char *firstname);
 148 QemuOpts *qemu_opts_parse(QemuOptsList *list, const char *params, int permit_abbrev);
 149 void qemu_opts_set_defaults(QemuOptsList *list, const char *params,
 150                             int permit_abbrev);
 151 QemuOpts *qemu_opts_from_qdict(QemuOptsList *list, const QDict *qdict,
 152                                Error **errp);
 153 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict);
 154 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp);
 155
 156 typedef int (*qemu_opts_loopfunc)(QemuOpts *opts, void *opaque);
 157 int qemu_opts_print(QemuOpts *opts, void *dummy);
 158 int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
 159                       int abort_on_failure);
 160
 161 #endif