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* syntax.c (skip_chars): Don't use uninitialized storage

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when searching a multibyte buffer for characters that are not in a
unibyte string that contains non-ASCII characters.
This commit is contained in:
Paul Eggert 2013-06-18 22:45:35 -07:00
parent 102626e225
commit 178ba3e6f5
2 changed files with 27 additions and 24 deletions
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6
src/ChangeLog
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@ -1,3 +1,9 @@
2013-06-19 Paul Eggert <eggert@cs.ucla.edu>
* syntax.c (skip_chars): Don't use uninitialized storage
when searching a multibyte buffer for characters that are not in a
unibyte string that contains non-ASCII characters.
2013-06-18 Jan Djärv <jan.h.d@swipnet.se>
* process.c: Include xgselect.h if HAVE_GLIB. Include glib.h

45
src/syntax.c
View file

@ -1577,34 +1577,31 @@ skip_chars (int forwardp, Lisp_Object string, Lisp_Object lim, int handle_iso_cl
the corresponding multibyte chars. */
if (multibyte && string_has_eight_bit)
{
unsigned char fastmap2[0400];
int range_start_byte, range_start_char;
memcpy (fastmap + 0200, fastmap2 + 0200, 0200);
char *p1;
char himap[0200 + 1];
memcpy (himap, fastmap + 0200, 0200);
himap[0200] = 0;
memset (fastmap + 0200, 0, 0200);
/* We are sure that this loop stops. */
for (i = 0200; ! fastmap2[i]; i++);
c = BYTE8_TO_CHAR (i);
fastmap[CHAR_LEADING_CODE (c)] = 1;
range_start_byte = i;
range_start_char = c;
char_ranges = alloca (sizeof *char_ranges * 128 * 2);
for (i = 129; i < 0400; i++)
i = 0;
while ((p1 = memchr (himap + i, 1, 0200 - i)))
{
c = BYTE8_TO_CHAR (i);
fastmap[CHAR_LEADING_CODE (c)] = 1;
if (i - range_start_byte != c - range_start_char)
{
char_ranges[n_char_ranges++] = range_start_char;
char_ranges[n_char_ranges++] = ((i - 1 - range_start_byte)
+ range_start_char);
range_start_byte = i;
range_start_char = c;
}
/* Deduce the next range C..C2 from the next clump of 1s
in HIMAP starting with &HIMAP[I]. HIMAP is the high
order half of the old FASTMAP. */
int c2, leading_code;
i = p1 - himap;
c = BYTE8_TO_CHAR (i + 0200);
i += strlen (p1);
c2 = BYTE8_TO_CHAR (i + 0200 - 1);
char_ranges[n_char_ranges++] = c;
char_ranges[n_char_ranges++] = c2;
leading_code = CHAR_LEADING_CODE (c);
memset (fastmap + leading_code, 1,
CHAR_LEADING_CODE (c2) - leading_code + 1);
}
char_ranges[n_char_ranges++] = range_start_char;
char_ranges[n_char_ranges++] = ((i - 1 - range_start_byte)
+ range_start_char);
}
}
else /* STRING is multibyte */