327 lines
8.6 KiB
C
327 lines
8.6 KiB
C
/* gui_string_util.c - String utilities used by the GUI system. */
|
|
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2008,2009 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/gui_string_util.h>
|
|
#include <grub/types.h>
|
|
#include <grub/misc.h>
|
|
#include <grub/mm.h>
|
|
|
|
/* Create a new NUL-terminated string on the heap as a substring of BUF.
|
|
The range of buf included is the half-open interval [START,END).
|
|
The index START is inclusive, END is exclusive. */
|
|
char *
|
|
grub_new_substring (const char *buf,
|
|
grub_size_t start, grub_size_t end)
|
|
{
|
|
if (end < start)
|
|
return 0;
|
|
grub_size_t len = end - start;
|
|
char *s = grub_malloc (len + 1);
|
|
if (! s)
|
|
return 0;
|
|
grub_memcpy (s, buf + start, len);
|
|
s[len] = '\0';
|
|
return s;
|
|
}
|
|
|
|
/* Eliminate "." and ".." path elements from PATH. A new heap-allocated
|
|
string is returned. */
|
|
static char *
|
|
canonicalize_path (const char *path)
|
|
{
|
|
int i;
|
|
const char *p;
|
|
char *newpath = 0;
|
|
|
|
/* Count the path components in path. */
|
|
int components = 1;
|
|
for (p = path; *p; p++)
|
|
if (*p == '/')
|
|
components++;
|
|
|
|
char **path_array = grub_malloc (components * sizeof (*path_array));
|
|
if (! path_array)
|
|
return 0;
|
|
|
|
/* Initialize array elements to NULL pointers; in case once of the
|
|
allocations fails, the cleanup code can just call grub_free() for all
|
|
pointers in the array. */
|
|
for (i = 0; i < components; i++)
|
|
path_array[i] = 0;
|
|
|
|
/* Parse the path into path_array. */
|
|
p = path;
|
|
for (i = 0; i < components && p; i++)
|
|
{
|
|
/* Find the end of the path element. */
|
|
const char *end = grub_strchr (p, '/');
|
|
if (!end)
|
|
end = p + grub_strlen (p);
|
|
|
|
/* Copy the element. */
|
|
path_array[i] = grub_new_substring (p, 0, end - p);
|
|
if (! path_array[i])
|
|
goto cleanup;
|
|
|
|
/* Advance p to point to the start of the next element, or NULL. */
|
|
if (*end)
|
|
p = end + 1;
|
|
else
|
|
p = 0;
|
|
}
|
|
|
|
/* Eliminate '.' and '..' elements from the path array. */
|
|
int newpath_length = 0;
|
|
for (i = components - 1; i >= 0; --i)
|
|
{
|
|
if (! grub_strcmp (path_array[i], "."))
|
|
{
|
|
grub_free (path_array[i]);
|
|
path_array[i] = 0;
|
|
}
|
|
else if (! grub_strcmp (path_array[i], "..")
|
|
&& i > 0)
|
|
{
|
|
/* Delete the '..' and the prior path element. */
|
|
grub_free (path_array[i]);
|
|
path_array[i] = 0;
|
|
--i;
|
|
grub_free (path_array[i]);
|
|
path_array[i] = 0;
|
|
}
|
|
else
|
|
{
|
|
newpath_length += grub_strlen (path_array[i]) + 1;
|
|
}
|
|
}
|
|
|
|
/* Construct a new path string. */
|
|
newpath = grub_malloc (newpath_length + 1);
|
|
if (! newpath)
|
|
goto cleanup;
|
|
|
|
newpath[0] = '\0';
|
|
char *newpath_end = newpath;
|
|
int first = 1;
|
|
for (i = 0; i < components; i++)
|
|
{
|
|
char *element = path_array[i];
|
|
if (element)
|
|
{
|
|
/* For all components but the first, prefix with a slash. */
|
|
if (! first)
|
|
newpath_end = grub_stpcpy (newpath_end, "/");
|
|
newpath_end = grub_stpcpy (newpath_end, element);
|
|
first = 0;
|
|
}
|
|
}
|
|
|
|
cleanup:
|
|
for (i = 0; i < components; i++)
|
|
grub_free (path_array[i]);
|
|
grub_free (path_array);
|
|
|
|
return newpath;
|
|
}
|
|
|
|
/* Return a new heap-allocated string representing to absolute path
|
|
to the file referred to by PATH. If PATH is an absolute path, then
|
|
the returned path is a copy of PATH. If PATH is a relative path, then
|
|
BASE is with PATH used to construct the absolute path. */
|
|
char *
|
|
grub_resolve_relative_path (const char *base, const char *path)
|
|
{
|
|
char *abspath;
|
|
char *canonpath;
|
|
char *p;
|
|
grub_size_t l;
|
|
|
|
/* If PATH is an absolute path, then just use it as is. */
|
|
if (path[0] == '/' || path[0] == '(')
|
|
return canonicalize_path (path);
|
|
|
|
abspath = grub_malloc (grub_strlen (base) + grub_strlen (path) + 3);
|
|
if (! abspath)
|
|
return 0;
|
|
|
|
/* Concatenate BASE and PATH. */
|
|
p = grub_stpcpy (abspath, base);
|
|
l = grub_strlen (abspath);
|
|
if (l == 0 || abspath[l-1] != '/')
|
|
{
|
|
*p = '/';
|
|
p++;
|
|
*p = 0;
|
|
}
|
|
grub_stpcpy (p, path);
|
|
|
|
canonpath = canonicalize_path (abspath);
|
|
if (! canonpath)
|
|
return abspath;
|
|
|
|
grub_free (abspath);
|
|
return canonpath;
|
|
}
|
|
|
|
/* Get the path of the directory where the file at FILE_PATH is located.
|
|
FILE_PATH should refer to a file, not a directory. The returned path
|
|
includes a trailing slash.
|
|
This does not handle GRUB "(hd0,0)" paths properly yet since it only
|
|
looks at slashes. */
|
|
char *
|
|
grub_get_dirname (const char *file_path)
|
|
{
|
|
int i;
|
|
int last_slash;
|
|
|
|
last_slash = -1;
|
|
for (i = grub_strlen (file_path) - 1; i >= 0; --i)
|
|
{
|
|
if (file_path[i] == '/')
|
|
{
|
|
last_slash = i;
|
|
break;
|
|
}
|
|
}
|
|
if (last_slash == -1)
|
|
return grub_strdup ("/");
|
|
|
|
return grub_new_substring (file_path, 0, last_slash + 1);
|
|
}
|
|
|
|
static __inline int
|
|
my_isxdigit (char c)
|
|
{
|
|
return ((c >= '0' && c <= '9')
|
|
|| (c >= 'a' && c <= 'f')
|
|
|| (c >= 'A' && c <= 'F'));
|
|
}
|
|
|
|
static int
|
|
parse_hex_color_component (const char *s, unsigned start, unsigned end)
|
|
{
|
|
unsigned len;
|
|
char buf[3];
|
|
|
|
len = end - start;
|
|
/* Check the limits so we don't overrun the buffer. */
|
|
if (len < 1 || len > 2)
|
|
return 0;
|
|
|
|
if (len == 1)
|
|
{
|
|
buf[0] = s[start]; /* Get the first and only hex digit. */
|
|
buf[1] = buf[0]; /* Duplicate the hex digit. */
|
|
}
|
|
else if (len == 2)
|
|
{
|
|
buf[0] = s[start];
|
|
buf[1] = s[start + 1];
|
|
}
|
|
|
|
buf[2] = '\0';
|
|
|
|
return grub_strtoul (buf, 0, 16);
|
|
}
|
|
|
|
/* Parse a color string of the form "r, g, b", "#RGB", "#RGBA",
|
|
"#RRGGBB", or "#RRGGBBAA". */
|
|
grub_err_t
|
|
grub_gui_parse_color (const char *s, grub_gui_color_t *color)
|
|
{
|
|
grub_gui_color_t c;
|
|
|
|
/* Skip whitespace. */
|
|
while (*s && grub_isspace (*s))
|
|
s++;
|
|
|
|
if (*s == '#')
|
|
{
|
|
/* HTML-style. Number if hex digits:
|
|
[6] #RRGGBB [3] #RGB
|
|
[8] #RRGGBBAA [4] #RGBA */
|
|
|
|
s++; /* Skip the '#'. */
|
|
/* Count the hexits to determine the format. */
|
|
int hexits = 0;
|
|
const char *end = s;
|
|
while (my_isxdigit (*end))
|
|
{
|
|
end++;
|
|
hexits++;
|
|
}
|
|
|
|
/* Parse the color components based on the format. */
|
|
if (hexits == 3 || hexits == 4)
|
|
{
|
|
c.red = parse_hex_color_component (s, 0, 1);
|
|
c.green = parse_hex_color_component (s, 1, 2);
|
|
c.blue = parse_hex_color_component (s, 2, 3);
|
|
if (hexits == 4)
|
|
c.alpha = parse_hex_color_component (s, 3, 4);
|
|
else
|
|
c.alpha = 255;
|
|
}
|
|
else if (hexits == 6 || hexits == 8)
|
|
{
|
|
c.red = parse_hex_color_component (s, 0, 2);
|
|
c.green = parse_hex_color_component (s, 2, 4);
|
|
c.blue = parse_hex_color_component (s, 4, 6);
|
|
if (hexits == 8)
|
|
c.alpha = parse_hex_color_component (s, 6, 8);
|
|
else
|
|
c.alpha = 255;
|
|
}
|
|
else
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT,
|
|
"invalid HTML-type color string `%s'", s);
|
|
}
|
|
else if (grub_isdigit (*s))
|
|
{
|
|
/* Comma separated decimal values. */
|
|
c.red = grub_strtoul (s, 0, 0);
|
|
if ((s = grub_strchr (s, ',')) == 0)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT,
|
|
"missing 1st comma separator in color `%s'", s);
|
|
s++;
|
|
c.green = grub_strtoul (s, 0, 0);
|
|
if ((s = grub_strchr (s, ',')) == 0)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT,
|
|
"missing 2nd comma separator in color `%s'", s);
|
|
s++;
|
|
c.blue = grub_strtoul (s, 0, 0);
|
|
if ((s = grub_strchr (s, ',')) == 0)
|
|
c.alpha = 255;
|
|
else
|
|
{
|
|
s++;
|
|
c.alpha = grub_strtoul (s, 0, 0);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (! grub_gui_get_named_color (s, &c))
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT,
|
|
"invalid named color `%s'", s);
|
|
}
|
|
|
|
if (grub_errno == GRUB_ERR_NONE)
|
|
*color = c;
|
|
return grub_errno;
|
|
}
|