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rte_cfgfile.h(3) DPDK rte_cfgfile.h(3)

NAME

rte_cfgfile.h

SYNOPSIS

#include <stddef.h>

Data Structures


struct rte_cfgfile_entry
struct rte_cfgfile_parameters

Macros


#define CFG_DEFAULT_COMMENT_CHARACTER ';'

Enumerations



enum { CFG_FLAG_GLOBAL_SECTION = 1, CFG_FLAG_EMPTY_VALUES = 2 }


Functions


struct rte_cfgfile * rte_cfgfile_load (const char *filename, int flags)
struct rte_cfgfile * rte_cfgfile_load_with_params (const char *filename, int flags, const struct rte_cfgfile_parameters *params)
struct rte_cfgfile * rte_cfgfile_create (int flags)
int rte_cfgfile_add_section (struct rte_cfgfile *cfg, const char *sectionname)
int rte_cfgfile_add_entry (struct rte_cfgfile *cfg, const char *sectionname, const char *entryname, const char *entryvalue)
int rte_cfgfile_set_entry (struct rte_cfgfile *cfg, const char *sectionname, const char *entryname, const char *entryvalue)
int rte_cfgfile_save (struct rte_cfgfile *cfg, const char *filename)
int rte_cfgfile_num_sections (struct rte_cfgfile *cfg, const char *sec_name, size_t length)
int rte_cfgfile_sections (struct rte_cfgfile *cfg, char *sections[], int max_sections)
int rte_cfgfile_has_section (struct rte_cfgfile *cfg, const char *sectionname)
int rte_cfgfile_section_num_entries (struct rte_cfgfile *cfg, const char *sectionname)
int rte_cfgfile_section_num_entries_by_index (struct rte_cfgfile *cfg, char *sectionname, int index)
int rte_cfgfile_section_entries (struct rte_cfgfile *cfg, const char *sectionname, struct rte_cfgfile_entry *entries, int max_entries)
int rte_cfgfile_section_entries_by_index (struct rte_cfgfile *cfg, int index, char *sectionname, struct rte_cfgfile_entry *entries, int max_entries)
const char * rte_cfgfile_get_entry (struct rte_cfgfile *cfg, const char *sectionname, const char *entryname)
int rte_cfgfile_has_entry (struct rte_cfgfile *cfg, const char *sectionname, const char *entryname)
int rte_cfgfile_close (struct rte_cfgfile *cfg)

Detailed Description

Configuration File management.

This library allows reading application defined parameters from standard format configuration file.

Definition in file rte_cfgfile.h.

Macro Definition Documentation

#define CFG_DEFAULT_COMMENT_CHARACTER ';'

Defines the default comment character used for parsing config files.

Definition at line 63 of file rte_cfgfile.h.

Enumeration Type Documentation

anonymous enum

cfgfile load operation flags

Enumerator

Indicates that the file supports key value entries before the first defined section. These entries can be accessed in the 'GLOBAL' section.
Indicates that file supports key value entries where the value can be zero length (e.g., 'key=').

Definition at line 46 of file rte_cfgfile.h.

Function Documentation

struct rte_cfgfile* rte_cfgfile_load (const char * filename, int flags)

Open config file.

Parameters:

filename Config file name.
flags Config file flags.

Returns:

Handle to configuration file on success, NULL otherwise.

struct rte_cfgfile* rte_cfgfile_load_with_params (const char * filename, int flags, const struct rte_cfgfile_parameters * params)

Open config file with specified optional parameters.

Parameters:

filename Config file name
flags Config file flags
params Additional configuration attributes. Must be configured with desired values prior to invoking this API.

Returns:

Handle to configuration file on success, NULL otherwise

struct rte_cfgfile* rte_cfgfile_create (int flags)

Create new cfgfile instance with empty sections and entries

Parameters:

flags
  • CFG_FLAG_GLOBAL_SECTION Indicates that the file supports key value entries before the first defined section. These entries can be accessed in the 'GLOBAL' section.
  • CFG_FLAG_EMPTY_VALUES Indicates that file supports key value entries where the value can be zero length (e.g., 'key=').

Returns:

Handle to cfgfile instance on success, NULL otherwise

int rte_cfgfile_add_section (struct rte_cfgfile * cfg, const char * sectionname)

Add section in cfgfile instance.

Parameters:

cfg Pointer to the cfgfile structure.
sectionname Section name which will be add to cfgfile.

Returns:

0 on success, -ENOMEM if can't add section

int rte_cfgfile_add_entry (struct rte_cfgfile * cfg, const char * sectionname, const char * entryname, const char * entryvalue)

Add entry to specified section in cfgfile instance.

Parameters:

cfg Pointer to the cfgfile structure.
sectionname Given section name to add an entry.
entryname Entry name to add.
entryvalue Entry value to add.

Returns:

0 on success, -EEXIST if entry already exist, -EINVAL if bad argument

int rte_cfgfile_set_entry (struct rte_cfgfile * cfg, const char * sectionname, const char * entryname, const char * entryvalue)

Update value of specified entry name in given section in config file

Parameters:

cfg Config file
sectionname Section name
entryname Entry name to look for the value change
entryvalue New entry value. Can be also an empty string if CFG_FLAG_EMPTY_VALUES = 1

Returns:

0 on success, -EINVAL if bad argument

int rte_cfgfile_save (struct rte_cfgfile * cfg, const char * filename)

Save object cfgfile to file on disc

Parameters:

cfg Config file structure
filename File name to save data

Returns:

0 on success, errno otherwise

int rte_cfgfile_num_sections (struct rte_cfgfile * cfg, const char * sec_name, size_t length)

Get number of sections in config file.

Parameters:

cfg Config file.
sec_name Section name.
length Maximum section name length.

Returns:

Number of sections.

int rte_cfgfile_sections (struct rte_cfgfile * cfg, char * sections[], int max_sections)

Get name of all config file sections.

Fills in the array sections with the name of all the sections in the file (up to the number of max_sections sections).

Parameters:

cfg Config file.
sections Array containing section names after successful invocation. Each element of this array should be preallocated by the user with at least CFG_NAME_LEN characters.
max_sections Maximum number of section names to be stored in sections array.

Returns:

Number of populated sections names.

int rte_cfgfile_has_section (struct rte_cfgfile * cfg, const char * sectionname)

Check if given section exists in config file.

Parameters:

cfg Config file.
sectionname Section name.

Returns:

TRUE (value different than 0) if section exists, FALSE (value 0) otherwise.

int rte_cfgfile_section_num_entries (struct rte_cfgfile * cfg, const char * sectionname)

Get number of entries in given config file section.

If multiple sections have the given name, this function operates on the first one.

Parameters:

cfg Config file.
sectionname Section name.

Returns:

Number of entries in section on success, -1 otherwise.

int rte_cfgfile_section_num_entries_by_index (struct rte_cfgfile * cfg, char * sectionname, int index)

Get number of entries in given config file section.

The index of a section is the same as the index of its name in the result of rte_cfgfile_sections. This API can be used when there are multiple sections with the same name.

Parameters:

cfg Config file.
sectionname Section name.
index Section index.

Returns:

Number of entries in section on success, -1 otherwise.

int rte_cfgfile_section_entries (struct rte_cfgfile * cfg, const char * sectionname, struct rte_cfgfile_entry * entries, int max_entries)

Get section entries as key-value pairs.

If multiple sections have the given name, this function operates on the first one.

Parameters:

cfg Config file.
sectionname Section name.
entries Pre-allocated array of at least max_entries entries where the section entries are stored as key-value pair after successful invocation.
max_entries Maximum number of section entries to be stored in entries array.

Returns:

Number of entries populated on success, -1 otherwise.

int rte_cfgfile_section_entries_by_index (struct rte_cfgfile * cfg, int index, char * sectionname, struct rte_cfgfile_entry * entries, int max_entries)

Get section entries as key-value pairs.

The index of a section is the same as the index of its name in the result of rte_cfgfile_sections. This API can be used when there are multiple sections with the same name.

Parameters:

cfg Config file.
index Section index.
sectionname Pre-allocated string of at least CFG_NAME_LEN characters where the section name is stored after successful invocation.
entries Pre-allocated array of at least max_entries entries where the section entries are stored as key-value pair after successful invocation.
max_entries Maximum number of section entries to be stored in entries array.

Returns:

Number of entries populated on success, -1 otherwise.

const char* rte_cfgfile_get_entry (struct rte_cfgfile * cfg, const char * sectionname, const char * entryname)

Get value of the named entry in named config file section.

If multiple sections have the given name, this function operates on the first one.

Parameters:

cfg Config file.
sectionname Section name.
entryname Entry name.

Returns:

Entry value on success, NULL otherwise.

int rte_cfgfile_has_entry (struct rte_cfgfile * cfg, const char * sectionname, const char * entryname)

Check if given entry exists in named config file section.

If multiple sections have the given name, this function operates on the first one.

Parameters:

cfg Config file.
sectionname Section name.
entryname Entry name.

Returns:

TRUE (value different than 0) if entry exists, FALSE (value 0) otherwise.

int rte_cfgfile_close (struct rte_cfgfile * cfg)

Close config file.

Parameters:

cfg Config file.

Returns:

0 on success, -1 otherwise.

Author

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Thu May 23 2024 Version 23.11.0