Command Argument Parsing

Data Structures
struct	apr_getopt_t
struct	apr_getopt_option_t
Typedefs
typedef void(	apr_getopt_err_fn_t )(void *arg, const char *err,...)
typedef struct apr_getopt_t	apr_getopt_t
typedef struct apr_getopt_option_t	apr_getopt_option_t
Functions
apr_status_t	apr_getopt_init (apr_getopt_t **os, apr_pool_t *cont, int argc, const char *const *argv)
apr_status_t	apr_getopt (apr_getopt_t *os, const char *opts, char *option_ch, const char **option_arg)
apr_status_t	apr_getopt_long (apr_getopt_t *os, const apr_getopt_option_t *opts, int *option_ch, const char **option_arg)

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Typedef Documentation

typedef void( apr_getopt_err_fn_t)(void *arg, const char *err,...)

An apr_getopt_t error callback function.

arg is this apr_getopt_t's errarg member.

typedef struct apr_getopt_option_t apr_getopt_option_t

See also:

apr_getopt_option_t

typedef struct apr_getopt_t apr_getopt_t

See also:

apr_getopt_t

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Function Documentation

apr_status_t apr_getopt	(	apr_getopt_t *	os,
		const char *	opts,
		char *	option_ch,
		const char **	option_arg
	)

Parse the options initialized by apr_getopt_init().

Parameters:

os	The apr_opt_t structure returned by apr_getopt_init()
opts	A string of characters that are acceptable options to the program. Characters followed by ":" are required to have an option associated
option_ch	The next option character parsed
option_arg	The argument following the option character:

Returns:

There are four potential status values on exit. They are:

             APR_EOF      --  No more options to parse
             APR_BADCH    --  Found a bad option character
             APR_BADARG   --  No argument followed the option flag
             APR_SUCCESS  --  The next option was found.
 

apr_status_t apr_getopt_init	(	apr_getopt_t **	os,
		apr_pool_t *	cont,
		int	argc,
		const char *const *	argv
	)

Initialize the arguments for parsing by apr_getopt().

Parameters:

os	The options structure created for apr_getopt()
cont	The pool to operate on
argc	The number of arguments to parse
argv	The array of arguments to parse

Remarks:

Arguments 3 and 4 are most commonly argc and argv from main(argc, argv) The (*os)->errfn is initialized to fprintf(stderr... but may be overridden.

apr_status_t apr_getopt_long	(	apr_getopt_t *	os,
		const apr_getopt_option_t *	opts,
		int *	option_ch,
		const char **	option_arg
	)

Parse the options initialized by apr_getopt_init(), accepting long options beginning with "--" in addition to single-character options beginning with "-".

Parameters:

os	The apr_getopt_t structure created by apr_getopt_init()
opts	A pointer to a list of apr_getopt_option_t structures, which can be initialized with { "name", optch, has_args }. has_args is nonzero if the option requires an argument. A structure with an optch value of 0 terminates the list.
option_ch	Receives the value of "optch" from the apr_getopt_option_t structure corresponding to the next option matched.
option_arg	Receives the argument following the option, if any.

Returns:

There are four potential status values on exit. They are:

             APR_EOF      --  No more options to parse
             APR_BADCH    --  Found a bad option character
             APR_BADARG   --  No argument followed the option flag
             APR_SUCCESS  --  The next option was found.
 

When APR_SUCCESS is returned, os->ind gives the index of the first non-option argument. On error, a message will be printed to stdout unless os->err is set to 0. If os->interleave is set to nonzero, options can come after arguments, and os->argv will be permuted to leave non-option arguments at the end (the original argv is unaffected).