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3ded6077ae
mpv/options/m_config.c
wm4 839c3ae64b options: don't sort sub-option help output 
Commit 2c2c1203 sorted the output of --list-options, but the same code
ias also used for listing sub-options, such as --vo=scale:help. For sub-
options, the order actually matters.
2014-04-12 11:38:00 +02:00

818 lines
26 KiB
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/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/// \file
/// \ingroup Config
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#include <stdbool.h>
#include "libmpv/client.h"
#include "talloc.h"
#include "m_config.h"
#include "options/m_option.h"
#include "common/msg.h"
static const union m_option_value default_value;
// Profiles allow to predefine some sets of options that can then
// be applied later on with the internal -profile option.
#define MAX_PROFILE_DEPTH 20
struct m_profile {
struct m_profile *next;
char *name;
char *desc;
int num_opts;
// Option/value pair array.
char **opts;
};
// In the file local case, this contains the old global value.
struct m_opt_backup {
struct m_opt_backup *next;
struct m_config_option *co;
void *backup;
};
static int parse_include(struct m_config *config, struct bstr param, bool set,
int flags)
{
if (param.len == 0)
return M_OPT_MISSING_PARAM;
if (!set)
return 1;
char *filename = bstrdup0(NULL, param);
config->includefunc(config->includefunc_ctx, filename, flags);
talloc_free(filename);
return 1;
}
static int parse_profile(struct m_config *config, const struct m_option *opt,
struct bstr name, struct bstr param, bool set, int flags)
{
if (!bstrcmp0(param, "help")) {
struct m_profile *p;
if (!config->profiles) {
MP_INFO(config, "No profiles have been defined.\n");
return M_OPT_EXIT - 1;
}
MP_INFO(config, "Available profiles:\n");
for (p = config->profiles; p; p = p->next)
MP_INFO(config, "\t%s\t%s\n", p->name, p->desc ? p->desc : "");
MP_INFO(config, "\n");
return M_OPT_EXIT - 1;
}
char **list = NULL;
int r = m_option_type_string_list.parse(config->log, opt, name, param, &list);
if (r < 0)
return r;
if (!list || !list[0])
return M_OPT_INVALID;
for (int i = 0; list[i]; i++) {
struct m_profile *p = m_config_get_profile0(config, list[i]);
if (!p) {
MP_WARN(config, "Unknown profile '%s'.\n", list[i]);
r = M_OPT_INVALID;
} else if (set)
m_config_set_profile(config, p, flags);
}
m_option_free(opt, &list);
return r;
}
static int show_profile(struct m_config *config, bstr param)
{
struct m_profile *p;
int i, j;
if (!param.len)
return M_OPT_MISSING_PARAM;
if (!(p = m_config_get_profile(config, param))) {
MP_ERR(config, "Unknown profile '%.*s'.\n", BSTR_P(param));
return M_OPT_EXIT - 1;
}
if (!config->profile_depth)
MP_INFO(config, "Profile %s: %s\n", p->name,
p->desc ? p->desc : "");
config->profile_depth++;
for (i = 0; i < p->num_opts; i++) {
char spc[config->profile_depth + 1];
for (j = 0; j < config->profile_depth; j++)
spc[j] = ' ';
spc[config->profile_depth] = '\0';
MP_INFO(config, "%s%s=%s\n", spc, p->opts[2 * i], p->opts[2 * i + 1]);
if (config->profile_depth < MAX_PROFILE_DEPTH
&& !strcmp(p->opts[2*i], "profile")) {
char *e, *list = p->opts[2 * i + 1];
while ((e = strchr(list, ','))) {
int l = e - list;
char tmp[l+1];
if (!l)
continue;
memcpy(tmp, list, l);
tmp[l] = '\0';
show_profile(config, bstr0(tmp));
list = e + 1;
}
if (list[0] != '\0')
show_profile(config, bstr0(list));
}
}
config->profile_depth--;
if (!config->profile_depth)
MP_INFO(config, "\n");
return M_OPT_EXIT - 1;
}
static int list_options(struct m_config *config)
{
m_config_print_option_list(config);
return M_OPT_EXIT;
}
// The memcpys are supposed to work around the strict aliasing violation,
// that would result if we just dereferenced a void** (where the void** is
// actually casted from struct some_type* ).
static void *substruct_read_ptr(const void *ptr)
{
void *res;
memcpy(&res, ptr, sizeof(void*));
return res;
}
static void substruct_write_ptr(void *ptr, void *val)
{
memcpy(ptr, &val, sizeof(void*));
}
static void add_options(struct m_config *config,
const char *parent_name,
void *optstruct,
const void *optstruct_def,
const struct m_option *defs);
static void config_destroy(void *p)
{
struct m_config *config = p;
m_config_restore_backups(config);
for (int n = 0; n < config->num_opts; n++)
m_option_free(config->opts[n].opt, config->opts[n].data);
}
struct m_config *m_config_new(void *talloc_ctx, struct mp_log *log,
size_t size, const void *defaults,
const struct m_option *options)
{
struct m_config *config = talloc(talloc_ctx, struct m_config);
talloc_set_destructor(config, config_destroy);
*config = (struct m_config) {.log = log};
// size==0 means a dummy object is created
if (size) {
config->optstruct = talloc_zero_size(config, size);
if (defaults)
memcpy(config->optstruct, defaults, size);
}
if (options)
add_options(config, "", config->optstruct, defaults, options);
return config;
}
struct m_config *m_config_from_obj_desc(void *talloc_ctx, struct mp_log *log,
struct m_obj_desc *desc)
{
return m_config_new(talloc_ctx, log, desc->priv_size, desc->priv_defaults,
desc->options);
}
// Like m_config_from_obj_desc(), but don't allocate option struct.
struct m_config *m_config_from_obj_desc_noalloc(void *talloc_ctx,
struct mp_log *log,
struct m_obj_desc *desc)
{
return m_config_new(talloc_ctx, log, 0, desc->priv_defaults, desc->options);
}
int m_config_set_obj_params(struct m_config *conf, char **args)
{
for (int n = 0; args && args[n * 2 + 0]; n++) {
int r = m_config_set_option(conf, bstr0(args[n * 2 + 0]),
bstr0(args[n * 2 + 1]));
if (r < 0)
return r;
}
return 0;
}
int m_config_apply_defaults(struct m_config *config, const char *name,
struct m_obj_settings *defaults)
{
int r = 0;
for (int n = 0; defaults && defaults[n].name; n++) {
struct m_obj_settings *entry = &defaults[n];
if (name && strcmp(entry->name, name) == 0) {
r = m_config_set_obj_params(config, entry->attribs);
break;
}
}
return r;
}
static void ensure_backup(struct m_config *config, struct m_config_option *co)
{
if (co->opt->type->flags & M_OPT_TYPE_HAS_CHILD)
return;
if (co->opt->flags & M_OPT_GLOBAL)
return;
if (!co->data)
return;
for (struct m_opt_backup *cur = config->backup_opts; cur; cur = cur->next) {
if (cur->co->data == co->data) // comparing data ptr catches aliases
return;
}
struct m_opt_backup *bc = talloc_ptrtype(NULL, bc);
*bc = (struct m_opt_backup) {
.co = co,
.backup = talloc_zero_size(bc, co->opt->type->size),
};
m_option_copy(co->opt, bc->backup, co->data);
bc->next = config->backup_opts;
config->backup_opts = bc;
}
void m_config_restore_backups(struct m_config *config)
{
while (config->backup_opts) {
struct m_opt_backup *bc = config->backup_opts;
config->backup_opts = bc->next;
m_option_copy(bc->co->opt, bc->co->data, bc->backup);
m_option_free(bc->co->opt, bc->backup);
talloc_free(bc);
}
}
void m_config_backup_opt(struct m_config *config, const char *opt)
{
struct m_config_option *co = m_config_get_co(config, bstr0(opt));
if (co) {
ensure_backup(config, co);
} else {
MP_ERR(config, "Option %s not found.\n", opt);
}
}
void m_config_backup_all_opts(struct m_config *config)
{
for (int n = 0; n < config->num_opts; n++)
ensure_backup(config, &config->opts[n]);
}
// Given an option --opt, add --no-opt (if applicable).
static void add_negation_option(struct m_config *config,
struct m_config_option *orig,
const char *parent_name)
{
const struct m_option *opt = orig->opt;
int value;
if (opt->type == CONF_TYPE_FLAG) {
value = opt->min;
} else if (opt->type == CONF_TYPE_CHOICE) {
// Find out whether there's a "no" choice.
// m_option_parse() should be used for this, but it prints
// unsilenceable error messages.
struct m_opt_choice_alternatives *alt = opt->priv;
for ( ; alt->name; alt++) {
if (strcmp(alt->name, "no") == 0)
break;
}
if (!alt->name)
return;
value = alt->value;
} else {
return;
}
struct m_option *no_opt = talloc_ptrtype(config, no_opt);
*no_opt = (struct m_option) {
.name = opt->name,
.type = CONF_TYPE_STORE,
.flags = opt->flags & (M_OPT_NOCFG | M_OPT_GLOBAL | M_OPT_PRE_PARSE),
.is_new_option = opt->is_new_option,
.p = opt->p,
.offset = opt->offset,
.max = value,
};
// Add --no-sub-opt
struct m_config_option co = *orig;
co.name = talloc_asprintf(config, "no-%s", orig->name);
co.opt = no_opt;
co.is_generated = true;
MP_TARRAY_APPEND(config, config->opts, config->num_opts, co);
// Add --sub-no-opt (unfortunately needed for: "--sub=...:no-opt")
if (parent_name[0]) {
co.name = talloc_asprintf(config, "%s-no-%s", parent_name, opt->name);
MP_TARRAY_APPEND(config, config->opts, config->num_opts, co);
}
}
static void m_config_add_option(struct m_config *config,
const char *parent_name,
void *optstruct,
const void *optstruct_def,
const struct m_option *arg);
static void add_options(struct m_config *config,
const char *parent_name,
void *optstruct,
const void *optstruct_def,
const struct m_option *defs)
{
for (int i = 0; defs && defs[i].name; i++)
m_config_add_option(config, parent_name, optstruct, optstruct_def, &defs[i]);
}
static void m_config_add_option(struct m_config *config,
const char *parent_name,
void *optstruct,
const void *optstruct_def,
const struct m_option *arg)
{
assert(config != NULL);
assert(arg != NULL);
struct m_config_option co = {
.opt = arg,
.name = arg->name,
};
if (arg->is_new_option) {
if (optstruct)
co.data = (char *)optstruct + arg->offset;
if (optstruct_def)
co.default_data = (char *)optstruct_def + arg->offset;
} else {
co.data = arg->p;
co.default_data = arg->p;
}
if (arg->defval)
co.default_data = arg->defval;
if (!co.default_data)
co.default_data = &default_value;
// Fill in the full name
if (!co.name[0]) {
co.name = parent_name;
} else if (parent_name[0]) {
co.name = talloc_asprintf(config, "%s-%s", parent_name, co.name);
}
// Option with children -> add them
if (arg->type->flags & M_OPT_TYPE_HAS_CHILD) {
if (arg->type->flags & M_OPT_TYPE_USE_SUBSTRUCT) {
const struct m_sub_options *subopts = arg->priv;
void *new_optstruct = NULL;
if (co.data) {
new_optstruct = m_config_alloc_struct(config, subopts);
substruct_write_ptr(co.data, new_optstruct);
}
const void *new_optstruct_def = substruct_read_ptr(co.default_data);
if (!new_optstruct_def)
new_optstruct_def = subopts->defaults;
add_options(config, co.name, new_optstruct,
new_optstruct_def, subopts->opts);
} else {
const struct m_option *sub = arg->p;
add_options(config, co.name, optstruct, optstruct_def, sub);
}
} else {
// Initialize options
if (co.data && co.default_data) {
if (arg->type->flags & M_OPT_TYPE_DYNAMIC) {
// Would leak memory by overwriting *co.data repeatedly.
for (int i = 0; i < config->num_opts; i++) {
if (co.data == config->opts[i].data)
assert(0);
}
}
// In case this is dynamic data, it has to be allocated and copied.
union m_option_value temp = {0};
memcpy(&temp, co.default_data, arg->type->size);
memset(co.data, 0, arg->type->size);
m_option_copy(arg, co.data, &temp);
}
}
if (arg->name[0]) // no own name -> hidden
MP_TARRAY_APPEND(config, config->opts, config->num_opts, co);
add_negation_option(config, &co, parent_name);
}
struct m_config_option *m_config_get_co(const struct m_config *config,
struct bstr name)
{
for (int n = 0; n < config->num_opts; n++) {
struct m_config_option *co = &config->opts[n];
struct bstr coname = bstr0(co->name);
if ((co->opt->type->flags & M_OPT_TYPE_ALLOW_WILDCARD)
&& bstr_endswith0(coname, "*")) {
coname.len--;
if (bstrcmp(bstr_splice(name, 0, coname.len), coname) == 0)
return co;
} else if (bstrcmp(coname, name) == 0)
return co;
}
return NULL;
}
const char *m_config_get_positional_option(const struct m_config *config, int p)
{
int pos = 0;
for (int n = 0; n < config->num_opts; n++) {
struct m_config_option *co = &config->opts[n];
if (!co->is_generated) {
if (pos == p)
return co->name;
pos++;
}
}
return NULL;
}
static int parse_subopts(struct m_config *config, char *name, char *prefix,
struct bstr param, int flags);
static int m_config_parse_option(struct m_config *config, struct bstr name,
struct bstr param, int flags)
{
assert(config != NULL);
assert(name.len != 0);
bool set = !(flags & M_SETOPT_CHECK_ONLY);
struct m_config_option *co = m_config_get_co(config, name);
if (!co)
return M_OPT_UNKNOWN;
// This is the only mandatory function
assert(co->opt->type->parse);
if ((flags & M_SETOPT_PRE_PARSE_ONLY) && !(co->opt->flags & M_OPT_PRE_PARSE))
return 0;
if ((flags & M_SETOPT_PRESERVE_CMDLINE) && co->is_set_from_cmdline)
set = false;
if (set) {
MP_VERBOSE(config, "Setting option '%.*s' = '%.*s' (flags = %d)\n",
BSTR_P(name), BSTR_P(param), flags);
}
// Check if this option isn't forbidden in the current mode
if ((flags & M_SETOPT_FROM_CONFIG_FILE) && (co->opt->flags & M_OPT_NOCFG)) {
MP_ERR(config, "The %.*s option can't be used in a config file.\n",
BSTR_P(name));
return M_OPT_INVALID;
}
if (flags & M_SETOPT_BACKUP) {
if (co->opt->flags & M_OPT_GLOBAL) {
MP_ERR(config, "The %.*s option is global and can't be set per-file.\n",
BSTR_P(name));
return M_OPT_INVALID;
}
if (set)
ensure_backup(config, co);
}
if (config->includefunc && bstr_equals0(name, "include"))
return parse_include(config, param, set, flags);
if (config->use_profiles && bstr_equals0(name, "profile"))
return parse_profile(config, co->opt, name, param, set, flags);
if (config->use_profiles && bstr_equals0(name, "show-profile"))
return show_profile(config, param);
if (bstr_equals0(name, "list-options"))
return list_options(config);
// Option with children are a bit different to parse
if (co->opt->type->flags & M_OPT_TYPE_HAS_CHILD) {
char prefix[110];
assert(strlen(co->name) < 100);
sprintf(prefix, "%s-", co->name);
return parse_subopts(config, (char *)co->name, prefix, param, flags);
}
int r = m_option_parse(config->log, co->opt, name, param,
set ? co->data : NULL);
if (r >= 0 && set && (flags & M_SETOPT_FROM_CMDLINE)) {
co->is_set_from_cmdline = true;
// Mark aliases too
if (co->data) {
for (int n = 0; n < config->num_opts; n++) {
struct m_config_option *co2 = &config->opts[n];
if (co2->data == co->data)
co2->is_set_from_cmdline = true;
}
}
}
return r;
}
static int parse_subopts(struct m_config *config, char *name, char *prefix,
struct bstr param, int flags)
{
char **lst = NULL;
// Split the argument into child options
int r = m_option_type_subconfig.parse(config->log, NULL, bstr0(""), param, &lst);
if (r < 0)
return r;
// Parse the child options
for (int i = 0; lst && lst[2 * i]; i++) {
// Build the full name
char n[110];
if (snprintf(n, 110, "%s%s", prefix, lst[2 * i]) > 100)
abort();
r = m_config_parse_option(config,bstr0(n), bstr0(lst[2 * i + 1]), flags);
if (r < 0) {
if (r > M_OPT_EXIT) {
MP_ERR(config, "Error parsing suboption %s/%s (%s)\n",
name, lst[2 * i], m_option_strerror(r));
r = M_OPT_INVALID;
}
break;
}
}
talloc_free(lst);
return r;
}
int m_config_parse_suboptions(struct m_config *config, char *name,
char *subopts)
{
if (!subopts || !*subopts)
return 0;
int r = parse_subopts(config, name, "", bstr0(subopts), 0);
if (r < 0 && r > M_OPT_EXIT) {
MP_ERR(config, "Error parsing suboption %s (%s)\n",
name, m_option_strerror(r));
r = M_OPT_INVALID;
}
return r;
}
int m_config_set_option_ext(struct m_config *config, struct bstr name,
struct bstr param, int flags)
{
int r = m_config_parse_option(config, name, param, flags);
if (r < 0 && r > M_OPT_EXIT) {
MP_ERR(config, "Error parsing option %.*s (%s)\n",
BSTR_P(name), m_option_strerror(r));
r = M_OPT_INVALID;
}
return r;
}
int m_config_set_option(struct m_config *config, struct bstr name,
struct bstr param)
{
return m_config_set_option_ext(config, name, param, 0);
}
int m_config_set_option_node(struct m_config *config, bstr name,
struct mpv_node *data, int flags)
{
char *value = NULL;
if (data->format == MPV_FORMAT_STRING) {
value = *(char **)data;
} else {
// This is pretty lame, but the simplest for now. It will fail very
// hard for string lists with items that contain ',' characters.
union m_option_value val = {0};
const struct m_option *opt = m_config_get_option(config, name);
if (!opt)
return M_OPT_UNKNOWN;
if (m_option_set_node(opt, &val, data) < 0)
return M_OPT_INVALID;
value = m_option_print(opt, &val);
m_option_free(opt, &val);
}
int r;
if (value) {
r = m_config_set_option_ext(config, name, bstr0(value), flags);
} else {
r = M_OPT_OUT_OF_RANGE;
}
if (data->format != MPV_FORMAT_STRING)
talloc_free(value);
return r;
}
const struct m_option *m_config_get_option(const struct m_config *config,
struct bstr name)
{
assert(config != NULL);
struct m_config_option *co = m_config_get_co(config, name);
return co ? co->opt : NULL;
}
int m_config_option_requires_param(struct m_config *config, bstr name)
{
const struct m_option *opt = m_config_get_option(config, name);
if (opt) {
if (bstr_endswith0(name, "-clr"))
return 0;
return m_option_required_params(opt);
}
return M_OPT_UNKNOWN;
}
static int sort_opt_compare(const void *pa, const void *pb)
{
const struct m_config_option *a = pa;
const struct m_config_option *b = pb;
return strcasecmp(a->name, b->name);
}
void m_config_print_option_list(const struct m_config *config)
{
char min[50], max[50];
int count = 0;
const char *prefix = config->is_toplevel ? "--" : "";
struct m_config_option *sorted =
talloc_memdup(NULL, config->opts, config->num_opts * sizeof(sorted[0]));
if (config->is_toplevel)
qsort(sorted, config->num_opts, sizeof(sorted[0]), sort_opt_compare);
MP_INFO(config, "Options:\n\n");
for (int i = 0; i < config->num_opts; i++) {
struct m_config_option *co = &sorted[i];
const struct m_option *opt = co->opt;
if (opt->type->flags & M_OPT_TYPE_HAS_CHILD)
continue;
if (co->is_generated)
continue;
MP_INFO(config, " %s%-30.30s", prefix, co->name);
if (opt->type == &m_option_type_choice) {
MP_INFO(config, " Choices:");
struct m_opt_choice_alternatives *alt = opt->priv;
for (int n = 0; alt[n].name; n++)
MP_INFO(config, " %s", alt[n].name);
if (opt->flags & (M_OPT_MIN | M_OPT_MAX))
MP_INFO(config, " (or an integer)");
} else {
MP_INFO(config, " %s", co->opt->type->name);
}
if (opt->flags & (M_OPT_MIN | M_OPT_MAX)) {
snprintf(min, sizeof(min), "any");
snprintf(max, sizeof(max), "any");
if (opt->flags & M_OPT_MIN)
snprintf(min, sizeof(min), "%.14g", opt->min);
if (opt->flags & M_OPT_MAX)
snprintf(max, sizeof(max), "%.14g", opt->max);
MP_INFO(config, " (%s to %s)", min, max);
}
char *def = NULL;
if (co->default_data)
def = m_option_print(co->opt, co->default_data);
if (def) {
MP_INFO(config, " (default: %s)", def);
talloc_free(def);
}
if (opt->flags & M_OPT_GLOBAL)
MP_INFO(config, " [global]");
if (opt->flags & M_OPT_NOCFG)
MP_INFO(config, " [nocfg]");
MP_INFO(config, "\n");
count++;
}
MP_INFO(config, "\nTotal: %d options\n", count);
talloc_free(sorted);
}
char **m_config_list_options(void *ta_parent, const struct m_config *config)
{
char **list = talloc_new(ta_parent);
int count = 0;
for (int i = 0; i < config->num_opts; i++) {
struct m_config_option *co = &config->opts[i];
const struct m_option *opt = co->opt;
if (opt->type->flags & M_OPT_TYPE_HAS_CHILD)
continue;
if (co->is_generated)
continue;
// For use with CONF_TYPE_STRING_LIST, it's important not to set list
// as allocation parent.
char *s = talloc_strdup(ta_parent, co->name);
MP_TARRAY_APPEND(ta_parent, list, count, s);
}
MP_TARRAY_APPEND(ta_parent, list, count, NULL);
return list;
}
struct m_profile *m_config_get_profile(const struct m_config *config, bstr name)
{
for (struct m_profile *p = config->profiles; p; p = p->next) {
if (bstr_equals0(name, p->name))
return p;
}
return NULL;
}
struct m_profile *m_config_get_profile0(const struct m_config *config,
char *name)
{
return m_config_get_profile(config, bstr0(name));
}
struct m_profile *m_config_add_profile(struct m_config *config, char *name)
{
struct m_profile *p = m_config_get_profile0(config, name);
if (p)
return p;
p = talloc_zero(config, struct m_profile);
p->name = talloc_strdup(p, name);
p->next = config->profiles;
config->profiles = p;
return p;
}
void m_profile_set_desc(struct m_profile *p, bstr desc)
{
talloc_free(p->desc);
p->desc = bstrdup0(p, desc);
}
int m_config_set_profile_option(struct m_config *config, struct m_profile *p,
bstr name, bstr val)
{
int i = m_config_set_option_ext(config, name, val,
M_SETOPT_CHECK_ONLY |
M_SETOPT_FROM_CONFIG_FILE);
if (i < 0)
return i;
p->opts = talloc_realloc(p, p->opts, char *, 2 * (p->num_opts + 2));
p->opts[p->num_opts * 2] = bstrdup0(p, name);
p->opts[p->num_opts * 2 + 1] = bstrdup0(p, val);
p->num_opts++;
p->opts[p->num_opts * 2] = p->opts[p->num_opts * 2 + 1] = NULL;
return 1;
}
void m_config_set_profile(struct m_config *config, struct m_profile *p,
int flags)
{
if (config->profile_depth > MAX_PROFILE_DEPTH) {
MP_WARN(config, "WARNING: Profile inclusion too deep.\n");
return;
}
config->profile_depth++;
for (int i = 0; i < p->num_opts; i++) {
m_config_set_option_ext(config,
bstr0(p->opts[2 * i]),
bstr0(p->opts[2 * i + 1]),
flags | M_SETOPT_FROM_CONFIG_FILE);
}
config->profile_depth--;
}
void *m_config_alloc_struct(void *talloc_ctx,
const struct m_sub_options *subopts)
{
void *substruct = talloc_zero_size(talloc_ctx, subopts->size);
if (subopts->defaults)
memcpy(substruct, subopts->defaults, subopts->size);
return substruct;
}
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