152 lines
3 KiB
C
152 lines
3 KiB
C
/* argv.c - methods for constructing argument vector */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/script_sh.h>
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/* Return nearest power of two that is >= v. */
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static unsigned
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round_up_exp (unsigned v)
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{
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v--;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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if (sizeof (v) > 4)
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v |= v >> 32;
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v++;
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v += (v == 0);
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return v;
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}
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void
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grub_script_argv_free (struct grub_script_argv *argv)
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{
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unsigned i;
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if (argv->args)
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{
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for (i = 0; i < argv->argc; i++)
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grub_free (argv->args[i]);
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grub_free (argv->args);
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}
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argv->argc = 0;
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argv->args = 0;
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argv->script = 0;
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}
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/* Make argv from argc, args pair. */
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int
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grub_script_argv_make (struct grub_script_argv *argv, int argc, char **args)
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{
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int i;
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struct grub_script_argv r = { 0, 0, 0 };
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for (i = 0; i < argc; i++)
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if (grub_script_argv_next (&r) || grub_script_argv_append (&r, args[i]))
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{
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grub_script_argv_free (&r);
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return 1;
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}
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*argv = r;
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return 0;
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}
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/* Prepare for next argc. */
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int
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grub_script_argv_next (struct grub_script_argv *argv)
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{
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char **p = argv->args;
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if (argv->args && argv->argc && argv->args[argv->argc - 1] == 0)
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return 0;
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p = grub_realloc (p, round_up_exp ((argv->argc + 2) * sizeof (char *)));
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if (! p)
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return 1;
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argv->argc++;
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argv->args = p;
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if (argv->argc == 1)
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argv->args[0] = 0;
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argv->args[argv->argc] = 0;
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return 0;
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}
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/* Append `s' to the last argument. */
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int
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grub_script_argv_append (struct grub_script_argv *argv, const char *s)
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{
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int a, b;
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char *p = argv->args[argv->argc - 1];
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if (! s)
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return 0;
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a = p ? grub_strlen (p) : 0;
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b = grub_strlen (s);
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p = grub_realloc (p, round_up_exp ((a + b + 1) * sizeof (char)));
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if (! p)
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return 1;
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grub_strcpy (p + a, s);
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argv->args[argv->argc - 1] = p;
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return 0;
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}
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/* Split `s' and append words as multiple arguments. */
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int
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grub_script_argv_split_append (struct grub_script_argv *argv, char *s)
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{
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char ch;
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char *p;
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int errors = 0;
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if (! s)
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return 0;
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while (! errors && *s)
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{
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p = s;
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while (*s && ! grub_isspace (*s))
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s++;
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ch = *s;
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*s = '\0';
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errors += grub_script_argv_append (argv, p);
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*s = ch;
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while (*s && grub_isspace (*s))
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s++;
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if (*s)
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errors += grub_script_argv_next (argv);
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}
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return errors;
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}
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