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Avoid cutting in the middle of UTF-8 string. 

* include/grub/charset.h (grub_getend): New function.
	* grub-core/script/function.c (grub_script_function_find): Use
	grub_getend.
	* grub-core/normal/completion.c (add_completion): Likewise.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-12-25 16:11:41 +01:00
parent f3cb4a4e57
commit 4d8c476536
4 changed files with 46 additions and 1 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2011-12-25 Vladimir Serbinenko <phcoder@gmail.com>
Avoid cutting in the middle of UTF-8 string.
* include/grub/charset.h (grub_getend): New function.
* grub-core/script/function.c (grub_script_function_find): Use
grub_getend.
* grub-core/normal/completion.c (add_completion): Likewise.
2011-12-25 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/normal/charset.c (grub_ucs4_to_utf8): Small stylistic fix.

2
grub-core/normal/completion.c
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@ -26,6 +26,7 @@
#include <grub/file.h>
#include <grub/parser.h>
#include <grub/extcmd.h>
#include <grub/charset.h>
/* The current word. */
static const char *current_word;
@ -86,6 +87,7 @@ add_completion (const char *completion, const char *extra,
s++;
t++;
}
s = match + grub_getend (match, s);
*s = '\0';
}

10
grub-core/script/function.c
View File

@ -20,6 +20,7 @@
#include <grub/script_sh.h>
#include <grub/parser.h>
#include <grub/mm.h>
#include <grub/charset.h>
grub_script_function_t grub_script_function_list;
@ -99,7 +100,14 @@ grub_script_function_find (char *functionname)
break;
if (! func)
grub_error (GRUB_ERR_UNKNOWN_COMMAND, "unknown command `%.20s'", functionname);
{
char tmp[21];
grub_strncpy (tmp, functionname, 20);
tmp[20] = 0;
/* Avoid truncating inside UTF-8 character. */
tmp[grub_getend (tmp, tmp + grub_strlen (tmp))] = 0;
grub_error (GRUB_ERR_UNKNOWN_COMMAND, "unknown command `%s'", tmp);
}
return func;
}

26
include/grub/charset.h
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@ -49,6 +49,32 @@ grub_utf8_to_utf16 (grub_uint16_t *dest, grub_size_t destsize,
const grub_uint8_t *src, grub_size_t srcsize,
const grub_uint8_t **srcend);
/* Determine the last position where the UTF-8 string [beg, end) can
be safely cut. */
static inline grub_size_t
grub_getend (const char *beg, const char *end)
{
const char *ptr;
for (ptr = end - 1; ptr >= beg; ptr--)
if ((*ptr & GRUB_UINT8_2_LEADINGBITS) != GRUB_UINT8_1_LEADINGBIT)
break;
if (ptr < beg)
return 0;
if ((*ptr & GRUB_UINT8_1_LEADINGBIT) == 0)
return ptr + 1 - beg;
if ((*ptr & GRUB_UINT8_3_LEADINGBITS) == GRUB_UINT8_2_LEADINGBITS
&& ptr + 2 <= end)
return ptr + 2 - beg;
if ((*ptr & GRUB_UINT8_4_LEADINGBITS) == GRUB_UINT8_3_LEADINGBITS
&& ptr + 3 <= end)
return ptr + 3 - beg;
if ((*ptr & GRUB_UINT8_5_LEADINGBITS) == GRUB_UINT8_4_LEADINGBITS
&& ptr + 4 <= end)
return ptr + 4 - beg;
/* Invalid character or incomplete. Cut before it. */
return ptr - beg;
}
/* Convert UTF-16 to UTF-8. */
static inline grub_uint8_t *
grub_utf16_to_utf8 (grub_uint8_t *dest, const grub_uint16_t *src,