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grub/grub-core/lib/arg.c
BVK Chaitanya 8c41176882 automake commit without merge history
2010-05-06 11:34:04 +05:30

403 lines
8.2 KiB
C
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/* arg.c - argument parser */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2003,2004,2005,2007,2008 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/err.h>
#include <grub/term.h>
#include <grub/extcmd.h>
#include <grub/i18n.h>
/* Built-in parser for default options. */
#define SHORT_ARG_HELP -100
#define SHORT_ARG_USAGE -101
static const struct grub_arg_option help_options[] =
{
{"help", SHORT_ARG_HELP, 0,
N_("Display this help and exit."), 0, ARG_TYPE_NONE},
{"usage", SHORT_ARG_USAGE, 0,
N_("Display the usage of this command and exit."), 0, ARG_TYPE_NONE},
{0, 0, 0, 0, 0, 0}
};
static struct grub_arg_option *
find_short (const struct grub_arg_option *options, char c)
{
struct grub_arg_option *found = 0;
auto struct grub_arg_option *fnd_short (const struct grub_arg_option *opt);
struct grub_arg_option *fnd_short (const struct grub_arg_option *opt)
{
while (opt->doc)
{
if (opt->shortarg == c)
return (struct grub_arg_option *) opt;
opt++;
}
return 0;
}
if (options)
found = fnd_short (options);
if (! found)
{
switch (c)
{
case 'h':
found = (struct grub_arg_option *) help_options;
break;
case 'u':
found = (struct grub_arg_option *) (help_options + 1);
break;
default:
break;
}
}
return found;
}
static struct grub_arg_option *
find_long (const struct grub_arg_option *options, const char *s, int len)
{
struct grub_arg_option *found = 0;
auto struct grub_arg_option *fnd_long (const struct grub_arg_option *opt);
struct grub_arg_option *fnd_long (const struct grub_arg_option *opt)
{
while (opt->doc)
{
if (opt->longarg && ! grub_strncmp (opt->longarg, s, len) &&
opt->longarg[len] == '\0')
return (struct grub_arg_option *) opt;
opt++;
}
return 0;
}
if (options)
found = fnd_long (options);
if (! found)
found = fnd_long (help_options);
return found;
}
static void
show_usage (grub_extcmd_t cmd)
{
grub_printf ("%s %s %s\n", _("Usage:"), cmd->cmd->name, _(cmd->cmd->summary));
}
void
grub_arg_show_help (grub_extcmd_t cmd)
{
auto void showargs (const struct grub_arg_option *opt);
int h_is_used = 0;
int u_is_used = 0;
auto void showargs (const struct grub_arg_option *opt)
{
for (; opt->doc; opt++)
{
int spacing = 20;
if (opt->shortarg && grub_isgraph (opt->shortarg))
grub_printf ("-%c%c ", opt->shortarg, opt->longarg ? ',':' ');
else if (opt->shortarg == SHORT_ARG_HELP && ! h_is_used)
grub_printf ("-h, ");
else if (opt->shortarg == SHORT_ARG_USAGE && ! u_is_used)
grub_printf ("-u, ");
else
grub_printf (" ");
if (opt->longarg)
{
grub_printf ("--%s", opt->longarg);
spacing -= grub_strlen (opt->longarg) + 2;
if (opt->arg)
{
grub_printf ("=%s", opt->arg);
spacing -= grub_strlen (opt->arg) + 1;
}
}
const char *doc = _(opt->doc);
for (;;)
{
while (spacing-- > 0)
grub_putchar (' ');
while (*doc && *doc != '\n')
grub_putchar (*doc++);
grub_putchar ('\n');
if (! *doc)
break;
doc++;
spacing = 4 + 20;
}
switch (opt->shortarg)
{
case 'h':
h_is_used = 1;
break;
case 'u':
u_is_used = 1;
break;
default:
break;
}
}
}
show_usage (cmd);
grub_printf ("%s\n\n", _(cmd->cmd->description));
if (cmd->options)
showargs (cmd->options);
showargs (help_options);
#if 0
grub_printf ("\nReport bugs to <%s>.\n", PACKAGE_BUGREPORT);
#endif
}
static int
parse_option (grub_extcmd_t cmd, int key, char *arg, struct grub_arg_list *usr)
{
switch (key)
{
case SHORT_ARG_HELP:
grub_arg_show_help (cmd);
return -1;
case SHORT_ARG_USAGE:
show_usage (cmd);
return -1;
default:
{
int found = -1;
int i = 0;
const struct grub_arg_option *opt = cmd->options;
while (opt->doc)
{
if (opt->shortarg && key == opt->shortarg)
{
found = i;
break;
}
opt++;
i++;
}
if (found == -1)
return -1;
usr[found].set = 1;
usr[found].arg = arg;
}
}
return 0;
}
int
grub_arg_parse (grub_extcmd_t cmd, int argc, char **argv,
struct grub_arg_list *usr, char ***args, int *argnum)
{
int curarg;
int arglen;
int complete = 0;
char **argl = 0;
int num = 0;
auto grub_err_t add_arg (char *s);
grub_err_t add_arg (char *s)
{
argl = grub_realloc (argl, (++num) * sizeof (char *));
if (! argl)
return grub_errno;
argl[num - 1] = s;
return 0;
}
for (curarg = 0; curarg < argc; curarg++)
{
char *arg = argv[curarg];
struct grub_arg_option *opt;
char *option = 0;
/* No option is used. */
if (arg[0] != '-' || grub_strlen (arg) == 1)
{
if (add_arg (arg) != 0)
goto fail;
continue;
}
/* One or more short options. */
if (arg[1] != '-')
{
char *curshort = arg + 1;
while (1)
{
opt = find_short (cmd->options, *curshort);
if (! opt)
{
grub_error (GRUB_ERR_BAD_ARGUMENT,
"unknown argument `-%c'", *curshort);
goto fail;
}
curshort++;
/* Parse all arguments here except the last one because
it can have an argument value. */
if (*curshort)
{
if (parse_option (cmd, opt->shortarg, 0, usr) || grub_errno)
goto fail;
}
else
{
if (opt->type != ARG_TYPE_NONE)
{
if (curarg + 1 < argc)
{
char *nextarg = argv[curarg + 1];
if (!(opt->flags & GRUB_ARG_OPTION_OPTIONAL)
|| (grub_strlen (nextarg) < 2 || nextarg[0] != '-'))
option = argv[++curarg];
}
}
break;
}
}
}
else /* The argument starts with "--". */
{
/* If the argument "--" is used just pass the other
arguments. */
if (grub_strlen (arg) == 2)
{
for (curarg++; curarg < argc; curarg++)
if (add_arg (argv[curarg]) != 0)
goto fail;
break;
}
option = grub_strchr (arg, '=');
if (option) {
arglen = option - arg - 2;
option++;
} else
arglen = grub_strlen (arg) - 2;
opt = find_long (cmd->options, arg + 2, arglen);
if (! opt)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "unknown argument `%s'", arg);
goto fail;
}
}
if (! (opt->type == ARG_TYPE_NONE
|| (! option && (opt->flags & GRUB_ARG_OPTION_OPTIONAL))))
{
if (! option)
{
grub_error (GRUB_ERR_BAD_ARGUMENT,
"missing mandatory option for `%s'", opt->longarg);
goto fail;
}
switch (opt->type)
{
case ARG_TYPE_NONE:
/* This will never happen. */
break;
case ARG_TYPE_STRING:
/* No need to do anything. */
break;
case ARG_TYPE_INT:
{
char *tail;
grub_strtoull (option, &tail, 0);
if (tail == 0 || tail == option || *tail != '\0' || grub_errno)
{
grub_error (GRUB_ERR_BAD_ARGUMENT,
"the argument `%s' requires an integer",
arg);
goto fail;
}
break;
}
case ARG_TYPE_DEVICE:
case ARG_TYPE_DIR:
case ARG_TYPE_FILE:
case ARG_TYPE_PATHNAME:
/* XXX: Not implemented. */
break;
}
if (parse_option (cmd, opt->shortarg, option, usr) || grub_errno)
goto fail;
}
else
{
if (option)
{
grub_error (GRUB_ERR_BAD_ARGUMENT,
"a value was assigned to the argument `%s' while it "
"doesn't require an argument", arg);
goto fail;
}
if (parse_option (cmd, opt->shortarg, 0, usr) || grub_errno)
goto fail;
}
}
complete = 1;
*args = argl;
*argnum = num;
fail:
return complete;
}
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