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my_getopt.cc
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/* Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.
This program 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; version 2 of the License.
This program 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 this program; if not, write to the Free Software Foundation,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
#include <my_global.h>
#include <m_string.h>
#include <stdlib.h>
#include <mysys_err.h>
#include <my_getopt.h>
#include <errno.h>
#include <m_string.h>
#include "my_default.h"
#include <m_ctype.h>
#include "../mysys/mysys_priv.h"
typedef void (*init_func_p)(const struct my_option *option, void *variable,
longlong value);
my_error_reporter my_getopt_error_reporter= &my_message_local;
static bool findopt(char *, uint, const struct my_option **);
my_bool getopt_compare_strings(const char *, const char *, uint);
static longlong getopt_ll(char *arg, const struct my_option *optp, int *err);
static ulonglong getopt_ull(char *, const struct my_option *, int *);
static double getopt_double(char *arg, const struct my_option *optp, int *err);
static void init_variables(const struct my_option *, init_func_p);
static void init_one_value(const struct my_option *, void *, longlong);
static void fini_one_value(const struct my_option *, void *, longlong);
static int setval(const struct my_option *, void *, char *, my_bool);
static char *check_struct_option(char *cur_arg, char *key_name);
static my_bool get_bool_argument(const struct my_option *opts,
const char *argument,
bool *error);
/*
The following three variables belong to same group and the number and
order of their arguments must correspond to each other.
*/
static const char *special_opt_prefix[]=
{"skip", "disable", "enable", "maximum", "loose", 0};
static const uint special_opt_prefix_lengths[]=
{ 4, 7, 6, 7, 5, 0};
enum enum_special_opt
{ OPT_SKIP, OPT_DISABLE, OPT_ENABLE, OPT_MAXIMUM, OPT_LOOSE};
char *disabled_my_option= (char*) "0";
char *enabled_my_option= (char*) "1";
/*
This is a flag that can be set in client programs. 0 means that
my_getopt will not print error messages, but the client should do
it by itself
*/
my_bool my_getopt_print_errors= 1;
/*
This is a flag that can be set in client programs. 1 means that
my_getopt will skip over options it does not know how to handle.
*/
my_bool my_getopt_skip_unknown= 0;
static my_getopt_value getopt_get_addr;
void my_getopt_register_get_addr(my_getopt_value func_addr)
{
getopt_get_addr= func_addr;
}
/**
Wrapper around my_handle_options() for interface compatibility.
@param argc [in, out] Command line options (count)
@param argv [in, out] Command line options (values)
@param longopts [in] Descriptor of all valid options
@param get_one_option [in] Optional callback function to process each option,
can be NULL.
@return Error in case of ambiguous or unknown options,
0 on success.
*/
int handle_options(int *argc, char ***argv,
const struct my_option *longopts,
my_get_one_option get_one_option)
{
return my_handle_options(argc, argv, longopts, get_one_option, NULL, FALSE);
}
union ull_dbl
{
ulonglong ull;
double dbl;
};
/**
Returns an ulonglong value containing a raw
representation of the given double value.
*/
ulonglong getopt_double2ulonglong(double v)
{
union ull_dbl u;
u.dbl= v;
compile_time_assert(sizeof(ulonglong) >= sizeof(double));
return u.ull;
}
/**
Returns the double value which corresponds to
the given raw representation.
*/
double getopt_ulonglong2double(ulonglong v)
{
union ull_dbl u;
u.ull= v;
return u.dbl;
}
/**
Handle command line options.
Sort options.
Put options first, until special end of options (--),
or until the end of argv. Parse options, check that the given option
matches with one of the options in struct 'my_option'.
Check that option was given an argument if it requires one
Call the optional 'get_one_option()' function once for each option.
Note that handle_options() can be invoked multiple times to
parse a command line in several steps.
In this case, use the global flag @c my_getopt_skip_unknown to indicate
that options unknown in the current step should be preserved in the
command line for later parsing in subsequent steps.
For 'long' options (--a_long_option), @c my_getopt_skip_unknown is
fully supported. Command line parameters such as:
- "--a_long_option"
- "--a_long_option=value"
- "--a_long_option value"
will be preserved as is when the option is not known.
For 'short' options (-S), support for @c my_getopt_skip_unknown
comes with some limitation, because several short options
can also be specified together in the same command line argument,
as in "-XYZ".
The first use case supported is: all short options are declared.
handle_options() will be able to interpret "-XYZ" as one of:
- an unknown X option
- "-X -Y -Z", three short options with no arguments
- "-X -YZ", where Y is a short option with argument Z
- "-XYZ", where X is a short option with argument YZ
based on the full short options specifications.
The second use case supported is: no short option is declared.
handle_options() will reject "-XYZ" as unknown, to be parsed later.
The use case that is explicitly not supported is to provide
only a partial list of short options to handle_options().
This function can not be expected to extract some option Y
in the middle of the string "-XYZ" in these conditions,
without knowing if X will be declared an option later.
Note that this limitation only impacts parsing of several
short options from the same command line argument,
as in "mysqld -anW5".
When each short option is properly separated out in the command line
argument, for example in "mysqld -a -n -w5", the code would actually
work even with partial options specs given at each stage.
@param [in, out] argc command line options (count)
@param [in, out] argv command line options (values)
@param [in] longopts descriptor of all valid options
@param [in] get_one_option optional callback function to process each option,
can be NULL.
@param [in] command_list NULL-terminated list of strings (commands) which
(if set) is looked up for all non-option strings
found while parsing the command line parameters.
The parsing terminates if a match is found. At
exit, argv [out] would contain all the remaining
unparsed options along with the matched command.
@param [in] ignore_unknown_option When set to TRUE, options are continued to
be read even when unknown options are
encountered.
@return error in case of ambiguous or unknown options,
0 on success.
*/
int my_handle_options(int *argc, char ***argv,
const struct my_option *longopts,
my_get_one_option get_one_option,
const char **command_list, my_bool ignore_unknown_option)
{
uint argvpos= 0, length;
my_bool end_of_options= 0, must_be_var, set_maximum_value,
option_is_loose;
char **pos, **pos_end, *optend, *opt_str, key_name[FN_REFLEN];
const struct my_option *optp;
void *value;
int error, i;
my_bool is_cmdline_arg= 1;
bool opt_found;
/* handle_options() assumes arg0 (program name) always exists */
DBUG_ASSERT(argc && *argc >= 1);
DBUG_ASSERT(argv && *argv);
(*argc)--; /* Skip the program name */
(*argv)++; /* --- || ---- */
init_variables(longopts, init_one_value);
/*
Search for args_separator, if found, then the first part of the
arguments are loaded from configs
*/
for (pos= *argv, pos_end=pos+ *argc; pos != pos_end ; pos++)
{
if (my_getopt_is_args_separator(*pos))
{
is_cmdline_arg= 0;
break;
}
}
for (pos= *argv, pos_end=pos+ *argc; pos != pos_end ; pos++)
{
char **first= pos;
char *cur_arg= *pos;
opt_found= false;
if (!is_cmdline_arg && (my_getopt_is_args_separator(cur_arg)))
{
is_cmdline_arg= 1;
/* save the separator too if skip unkown options */
if (my_getopt_skip_unknown)
(*argv)[argvpos++]= cur_arg;
else
(*argc)--;
continue;
}
if (cur_arg[0] == '-' && cur_arg[1] && !end_of_options) /* must be opt */
{
char *argument= 0;
must_be_var= 0;
set_maximum_value= 0;
option_is_loose= 0;
cur_arg++; /* skip '-' */
if (*cur_arg == '-') /* check for long option, */
{
if (!*++cur_arg) /* skip the double dash */
{
/* '--' means end of options, look no further */
end_of_options= 1;
(*argc)--;
continue;
}
opt_str= check_struct_option(cur_arg, key_name);
optend= strcend(opt_str, '=');
length= (uint) (optend - opt_str);
if (*optend == '=')
optend++;
else
optend= 0;
/*
Find first the right option. Return error in case of an ambiguous,
or unknown option
*/
optp= longopts;
if (!(opt_found= findopt(opt_str, length, &optp)))
{
/*
Didn't find any matching option. Let's see if someone called
option with a special option prefix
*/
if (!must_be_var)
{
if (optend)
must_be_var= 1; /* option is followed by an argument */
for (i= 0; special_opt_prefix[i]; i++)
{
if (!getopt_compare_strings(special_opt_prefix[i], opt_str,
special_opt_prefix_lengths[i]) &&
(opt_str[special_opt_prefix_lengths[i]] == '-' ||
opt_str[special_opt_prefix_lengths[i]] == '_'))
{
/*
We were called with a special prefix, we can reuse opt_found
*/
opt_str+= special_opt_prefix_lengths[i] + 1;
length-= special_opt_prefix_lengths[i] + 1;
if (i == OPT_LOOSE)
option_is_loose= 1;
if ((opt_found= findopt(opt_str, length, &optp)))
{
switch (i) {
case OPT_SKIP:
case OPT_DISABLE: /* fall through */
/*
double negation is actually enable again,
for example: --skip-option=0 -> option = TRUE
*/
optend= (optend && *optend == '0' && !(*(optend + 1))) ?
enabled_my_option : disabled_my_option;
break;
case OPT_ENABLE:
optend= (optend && *optend == '0' && !(*(optend + 1))) ?
disabled_my_option : enabled_my_option;
break;
case OPT_MAXIMUM:
set_maximum_value= 1;
must_be_var= 1;
break;
}
break; /* break from the inner loop, main loop continues */
}
i= -1; /* restart the loop */
}
}
}
if (!opt_found)
{
if (my_getopt_skip_unknown)
{
/* Preserve all the components of this unknown option. */
do {
(*argv)[argvpos++]= *first++;
} while (first <= pos);
continue;
}
if (must_be_var)
{
if (my_getopt_print_errors)
my_getopt_error_reporter(option_is_loose ?
WARNING_LEVEL : ERROR_LEVEL,
"unknown variable '%s'", cur_arg);
if (!option_is_loose)
return EXIT_UNKNOWN_VARIABLE;
}
else
{
if (my_getopt_print_errors)
my_getopt_error_reporter(option_is_loose ?
WARNING_LEVEL : ERROR_LEVEL,
"unknown option '--%s'", cur_arg);
if (!(option_is_loose || ignore_unknown_option))
return EXIT_UNKNOWN_OPTION;
}
if (option_is_loose || ignore_unknown_option)
{
(*argc)--;
continue;
}
}
}
if ((optp->var_type & GET_TYPE_MASK) == GET_DISABLED)
{
if (my_getopt_print_errors)
my_message_local(option_is_loose ? WARNING_LEVEL : ERROR_LEVEL,
"%s: Option '%s' used, but is disabled",
my_progname, opt_str);
if (option_is_loose)
{
(*argc)--;
continue;
}
return EXIT_OPTION_DISABLED;
}
error= 0;
value= optp->var_type & GET_ASK_ADDR ?
(*getopt_get_addr)(key_name, strlen(key_name), optp, &error) :
optp->value;
if (error)
return error;
if (optp->arg_type == NO_ARG)
{
/*
Due to historical reasons GET_BOOL var_types still accepts arguments
despite the NO_ARG arg_type attribute. This can seems a bit unintuitive
and care should be taken when refactoring this code.
*/
if (optend && (optp->var_type & GET_TYPE_MASK) != GET_BOOL)
{
if (my_getopt_print_errors)
my_getopt_error_reporter(ERROR_LEVEL,
"%s: option '--%s' cannot take an argument",
my_progname, optp->name);
return EXIT_NO_ARGUMENT_ALLOWED;
}
if ((optp->var_type & GET_TYPE_MASK) == GET_BOOL)
{
/*
Set bool to 1 if no argument or if the user has used
--enable-'option-name'.
*optend was set to '0' if one used --disable-option
*/
(*argc)--;
if(!optend)
*((my_bool*) value)= (my_bool) 1;
else
{
my_bool ret= 0;
bool error= 0;
ret= get_bool_argument(optp, optend, &error);
if(error)
{
my_getopt_error_reporter(WARNING_LEVEL,
"%s: ignoring option '--%s' "
"due to invalid value '%s'",
my_progname, optp->name, optend);
continue;
}
else
*((my_bool*) value)= ret;
}
if (get_one_option && get_one_option(optp->id, optp,
*((my_bool*) value) ?
enabled_my_option : disabled_my_option))
return EXIT_ARGUMENT_INVALID;
continue;
}
argument= optend;
}
else if (optp->arg_type == REQUIRED_ARG && !optend)
{
/* Check if there are more arguments after this one,
Note: options loaded from config file that requires value
should always be in the form '--option=value'.
*/
if (!is_cmdline_arg || !*++pos)
{
if (my_getopt_print_errors)
my_getopt_error_reporter(ERROR_LEVEL,
"%s: option '--%s' requires an argument",
my_progname, optp->name);
return EXIT_ARGUMENT_REQUIRED;
}
argument= *pos;
(*argc)--;
}
else
argument= optend;
if (optp->var_type == GET_PASSWORD && is_cmdline_arg && argument)
print_cmdline_password_warning();
}
else /* must be short option */
{
for (optend= cur_arg; *optend; optend++)
{
opt_found= false;
for (optp= longopts; optp->name; optp++)
{
if (optp->id && optp->id == (int) (uchar) *optend)
{
/* Option recognized. Find next what to do with it */
opt_found= true;
if ((optp->var_type & GET_TYPE_MASK) == GET_DISABLED)
{
if (my_getopt_print_errors)
my_message_local(ERROR_LEVEL,
"%s: Option '-%c' used, but is disabled",
my_progname, optp->id);
return EXIT_OPTION_DISABLED;
}
if ((optp->var_type & GET_TYPE_MASK) == GET_BOOL &&
optp->arg_type == NO_ARG)
{
*((my_bool*) optp->value)= (my_bool) 1;
if (get_one_option && get_one_option(optp->id, optp, argument))
return EXIT_UNSPECIFIED_ERROR;
continue;
}
else if (optp->arg_type == REQUIRED_ARG ||
optp->arg_type == OPT_ARG)
{
if (*(optend + 1))
{
/* The rest of the option is option argument */
argument= optend + 1;
/* This is in effect a jump out of the outer loop */
optend= (char*) " ";
if (optp->var_type == GET_PASSWORD && is_cmdline_arg)
print_cmdline_password_warning();
}
else
{
if (optp->arg_type == OPT_ARG)
{
if (optp->var_type == GET_BOOL)
*((my_bool*) optp->value)= (my_bool) 1;
if (get_one_option && get_one_option(optp->id, optp, argument))
return EXIT_UNSPECIFIED_ERROR;
continue;
}
/* Check if there are more arguments after this one */
if (!pos[1])
{
if (my_getopt_print_errors)
my_getopt_error_reporter(ERROR_LEVEL,
"%s: option '-%c' requires an argument",
my_progname, optp->id);
return EXIT_ARGUMENT_REQUIRED;
}
argument= *++pos;
(*argc)--;
/* the other loop will break, because *optend + 1 == 0 */
}
}
if ((error= setval(optp, optp->value, argument,
set_maximum_value)))
return error;
if (get_one_option && get_one_option(optp->id, optp, argument))
return EXIT_UNSPECIFIED_ERROR;
break;
}
}
if (!opt_found)
{
if (my_getopt_skip_unknown)
{
/*
We are currently parsing a single argv[] argument
of the form "-XYZ".
One or the argument found (say Y) is not an option.
Hack the string "-XYZ" to make a "-YZ" substring in it,
and push that to the output as an unrecognized parameter.
*/
DBUG_ASSERT(optend > *pos);
DBUG_ASSERT(optend >= cur_arg);
DBUG_ASSERT(optend <= *pos + strlen(*pos));
DBUG_ASSERT(*optend);
optend--;
optend[0]= '-'; /* replace 'X' or '-' by '-' */
(*argv)[argvpos++]= optend;
/*
Do not continue to parse at the current "-XYZ" argument,
skip to the next argv[] argument instead.
*/
optend= (char*) " ";
}
else
{
if (my_getopt_print_errors)
my_getopt_error_reporter(ERROR_LEVEL,
"%s: unknown option '-%c'",
my_progname, *optend);
return EXIT_UNKNOWN_OPTION;
}
}
}
if (opt_found)
(*argc)--; /* option handled (short), decrease argument count */
continue;
}
if ((error= setval(optp, value, argument, set_maximum_value)))
return error;
if (get_one_option && get_one_option(optp->id, optp, argument))
return EXIT_UNSPECIFIED_ERROR;
(*argc)--; /* option handled (long), decrease argument count */
}
else /* non-option found */
{
if (command_list)
{
while (* command_list)
{
if (!strcmp(*command_list, cur_arg))
{
/* Match found. */
(*argv)[argvpos ++]= cur_arg;
/* Copy rest of the un-parsed elements & return. */
while ((++ pos) != pos_end)
(*argv)[argvpos ++]= *pos;
goto done;
}
command_list ++;
}
}
(*argv)[argvpos ++]= cur_arg;
}
}
done:
/*
Destroy the first, already handled option, so that programs that look
for arguments in 'argv', without checking 'argc', know when to stop.
Items in argv, before the destroyed one, are all non-option -arguments
to the program, yet to be (possibly) handled.
*/
(*argv)[argvpos]= 0;
return 0;
}
/**
* This function should be called to print a warning message
* if password string is specified on the command line.
*/
void print_cmdline_password_warning()
{
static my_bool password_warning_announced= FALSE;
if (!password_warning_announced)
{
my_message_local(WARNING_LEVEL, "Using a password on the command line "
"interface can be insecure.");
password_warning_announced= TRUE;
}
}
/**
@brief Check for struct options
@param[in] cur_arg Current argument under processing from argv
@param[in] key_name variable where to store the possible key name
@details
In case option is a struct option, returns a pointer to the current
argument at the position where the struct option (key_name) ends, the
next character after the dot. In case argument is not a struct option,
returns a pointer to the argument.
key_name will hold the name of the key, or 0 if not found.
@return char*
If struct option Pointer to next character after dot.
If no struct option Pointer to the argument
*/
static char *check_struct_option(char *cur_arg, char *key_name)
{
char *dot_pos, *equal_pos, *space_pos;
dot_pos= strcend(cur_arg + 1, '.'); /* Skip the first character */
equal_pos= strcend(cur_arg, '=');
space_pos= strcend(cur_arg, ' ');
/*
If the first dot is after an equal sign, then it is part
of a variable value and the option is not a struct option.
Also, if the last character in the string before the ending
NULL, or the character right before equal sign is the first
dot found, the option is not a struct option.
*/
if ((equal_pos > dot_pos) && (space_pos > dot_pos))
{
size_t len= (uint) (dot_pos - cur_arg);
set_if_smaller(len, FN_REFLEN-1);
strmake(key_name, cur_arg, len);
return ++dot_pos;
}
else
{
key_name[0]= 0;
return cur_arg;
}
}
/**
Parse a boolean command line argument
"ON", "TRUE" and "1" will return true,
other values will return false.
@param[in] argument The value argument
@return boolean value
*/
static my_bool get_bool_argument(const struct my_option *opts,
const char *argument,
bool *error)
{
if (!my_strcasecmp(&my_charset_latin1, argument, "true") ||
!my_strcasecmp(&my_charset_latin1, argument, "on") ||
!my_strcasecmp(&my_charset_latin1, argument, "1"))
return 1;
else if (!my_strcasecmp(&my_charset_latin1, argument, "false") ||
!my_strcasecmp(&my_charset_latin1, argument, "off") ||
!my_strcasecmp(&my_charset_latin1, argument, "0"))
return 0;
else
*error= 1;
return 0;
}
/*
function: setval
Arguments: opts, argument
Will set the option value to given value
*/
static int setval(const struct my_option *opts, void *value, char *argument,
my_bool set_maximum_value)
{
int err= 0, res= 0;
bool error= 0;
ulong var_type= opts->var_type & GET_TYPE_MASK;
if (!argument)
argument= enabled_my_option;
/*
Thus check applies only to options that have a defined value
storage pointer.
We do it for numeric types only, as empty value is a valid
option for strings (the only way to reset back to default value).
Note: it does not relate to OPT_ARG/REQUIRED_ARG/NO_ARG, since
--param="" is not generally the same as --param.
TODO: Add an option definition flag to signify whether empty value
(i.e. --param="") is an acceptable value or an error and extend
the check to all options.
*/
if (!*argument &&
(
var_type == GET_INT ||
var_type == GET_UINT ||
var_type == GET_LONG ||
var_type == GET_ULONG ||
var_type == GET_LL ||
var_type == GET_ULL ||
var_type == GET_DOUBLE ||
var_type == GET_ENUM
)
)
{
my_getopt_error_reporter(ERROR_LEVEL,
"%s: Empty value for '%s' specified",
my_progname, opts->name);
return EXIT_ARGUMENT_REQUIRED;
}
if (value)
{
if (set_maximum_value && !(value= opts->u_max_value))
{
my_getopt_error_reporter(ERROR_LEVEL,
"%s: Maximum value of '%s' cannot be set",
my_progname, opts->name);
return EXIT_NO_PTR_TO_VARIABLE;
}
switch (var_type) {
case GET_BOOL: /* If argument differs from 0, enable option, else disable */
*((my_bool*) value)= get_bool_argument(opts, argument, &error);
if(error)
my_getopt_error_reporter(WARNING_LEVEL,
"option '%s': boolean value '%s' wasn't recognized. Set to OFF.",
opts->name, argument);
break;
case GET_INT:
*((int*) value)= (int) getopt_ll(argument, opts, &err);
break;
case GET_UINT:
*((uint*) value)= (uint) getopt_ull(argument, opts, &err);
break;
case GET_LONG:
*((long*) value)= (long) getopt_ll(argument, opts, &err);
break;
case GET_ULONG:
*((long*) value)= (long) getopt_ull(argument, opts, &err);
break;
case GET_LL:
*((longlong*) value)= getopt_ll(argument, opts, &err);
break;
case GET_ULL:
*((ulonglong*) value)= getopt_ull(argument, opts, &err);
break;
case GET_DOUBLE:
*((double*) value)= getopt_double(argument, opts, &err);
break;
case GET_STR:
case GET_PASSWORD:
if (argument == enabled_my_option)
break; /* string options don't use this default of "1" */
*((char**) value)= argument;
break;
case GET_STR_ALLOC:
if (argument == enabled_my_option)
break; /* string options don't use this default of "1" */
my_free(*((char**) value));
if (!(*((char**) value)= my_strdup(key_memory_defaults,
argument, MYF(MY_WME))))
{
res= EXIT_OUT_OF_MEMORY;
goto ret;
};
break;
case GET_ENUM:
{
int type= find_type(argument, opts->typelib, FIND_TYPE_BASIC);
if (type == 0)
{
/*
Accept an integer representation of the enumerated item.
*/
char *endptr;
ulong arg= strtoul(argument, &endptr, 10);
if (*endptr || arg >= opts->typelib->count)
{
res= EXIT_ARGUMENT_INVALID;
goto ret;
}
*(ulong*)value= arg;
}
else if (type < 0)
{
res= EXIT_AMBIGUOUS_OPTION;
goto ret;
}
else
*(ulong*)value= type - 1;
}
break;
case GET_SET:
*((ulonglong*)value)= find_typeset(argument, opts->typelib, &err);
if (err)
{
/* Accept an integer representation of the set */
char *endptr;
ulonglong arg= (ulonglong) strtol(argument, &endptr, 10);
if (*endptr || (arg >> 1) >= (1ULL << (opts->typelib->count-1)))
{
res= EXIT_ARGUMENT_INVALID;
goto ret;
};
*(ulonglong*)value= arg;
err= 0;
}
break;
case GET_FLAGSET:
{
char *error;
uint error_len;
*((ulonglong*)value)=
find_set_from_flags(opts->typelib, opts->typelib->count,
*(ulonglong *)value, opts->def_value,
argument, (uint)strlen(argument),
&error, &error_len);
if (error)
{
res= EXIT_ARGUMENT_INVALID;
goto ret;
};
}
break;
case GET_NO_ARG: /* get_one_option has taken care of the value already */
default: /* dummy default to avoid compiler warnings */
break;
}
if (err)
{
res= EXIT_UNKNOWN_SUFFIX;
goto ret;
};
}
return 0;
ret:
my_getopt_error_reporter(ERROR_LEVEL,
"%s: Error while setting value '%s' to '%s'",
my_progname, argument, opts->name);
return res;
}
/**
Find option
IMPLEMENTATION
Go through all options in the my_option struct. Return true
if an option is found. sets opt_res to the option found, if any.
@param optpat name of option to find (with - or _)
@param length Length of optpat
@param[in,out] opt_res Options
@retval false No matching options
@retval true Found an option
*/
static bool findopt(char *optpat, uint length,
const struct my_option **opt_res)
{
for (const struct my_option *opt= *opt_res; opt->name; opt++)
if (!getopt_compare_strings(opt->name, optpat, length) &&
!opt->name[length])
{
(*opt_res)= opt;
return true;
}
return false;
}
/*
function: compare_strings
Works like strncmp, other than 1.) considers '-' and '_' the same.
2.) Returns -1 if strings differ, 0 if they are equal
*/
my_bool getopt_compare_strings(const char *s, const char *t,
uint length)
{
char const *end= s + length;
for (;s != end ; s++, t++)
{
if ((*s != '-' ? *s : '_') != (*t != '-' ? *t : '_'))
return 1;
}
return 0;
}
/*
function: eval_num_suffix
Transforms a number with a suffix to real number. Suffix can
be k|K for kilo, m|M for mega or g|G for giga.
*/
static longlong eval_num_suffix(char *argument, int *error, char *option_name)
{
char *endchar;
longlong num;
*error= 0;
errno= 0;
num= my_strtoll(argument, &endchar, 10);
if (errno == ERANGE)
{
my_getopt_error_reporter(ERROR_LEVEL,
"Incorrect integer value: '%s'", argument);
*error= 1;
return 0;
}
if (*endchar == 'k' || *endchar == 'K')
num*= 1024L;
else if (*endchar == 'm' || *endchar == 'M')
num*= 1024L * 1024L;
else if (*endchar == 'g' || *endchar == 'G')
num*= 1024L * 1024L * 1024L;
else if (*endchar)
{
my_message_local(ERROR_LEVEL,
"Unknown suffix '%c' used for variable '%s' (value '%s')",
*endchar, option_name, argument);
*error= 1;
return 0;
}
return num;
}
/**
function: eval_num_suffix_ull
This is the same as eval_num_suffix, but is meant for unsigned long long
values. Transforms an unsigned number with a suffix to real number. Suffix can
be k|K for kilo, m|M for mega or g|G for giga.
@param [IN] argument argument value for option_name
@param [IN, OUT] error error no.
@param [IN] option_name name of option
*/
static ulonglong eval_num_suffix_ull(char *argument, int *error, char *option_name)
{
char *endchar;
ulonglong num;
*error= 0;
errno= 0;
num= my_strtoull(argument, &endchar, 10);
if (errno == ERANGE)
{
my_getopt_error_reporter(ERROR_LEVEL,
"Incorrect unsigned integer value: '%s'", argument);
*error= 1;
return 0;
}
if (*endchar == 'k' || *endchar == 'K')
num*= 1024L;
else if (*endchar == 'm' || *endchar == 'M')
num*= 1024L * 1024L;