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xdiff: cast arguments for ctype functions to unsigned char

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The ctype functions isspace(), isalnum(), et al take an integer
argument representing an unsigned character, or -1 for EOF.  On
platforms with a signed char, it is unsafe to pass a char to them
without casting it to unsigned char first.

Most of git is already shielded against this by the ctype
implementation in git-compat-util.h, but xdiff, which uses libc
ctype.h, ought to be fixed.

Noticed-by: der Mouse <mouse@Rodents-Montreal.ORG>
Reported-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Nieder 2010-10-04 04:09:17 -05:00 committed by Junio C Hamano
parent 9173912be3
commit 349362cc20
3 changed files with 11 additions and 10 deletions
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1
xdiff/xmacros.h
View File

@ -30,6 +30,7 @@
#define XDL_MAX(a, b) ((a) > (b) ? (a): (b))
#define XDL_ABS(v) ((v) >= 0 ? (v): -(v))
#define XDL_ISDIGIT(c) ((c) >= '0' && (c) <= '9')
#define XDL_ISSPACE(c) (isspace((unsigned char)(c)))
#define XDL_ADDBITS(v,b) ((v) + ((v) >> (b)))
#define XDL_MASKBITS(b) ((1UL << (b)) - 1)
#define XDL_HASHLONG(v,b) (XDL_ADDBITS((unsigned long)(v), b) & XDL_MASKBITS(b))

2
xdiff/xmerge.c
View File

@ -336,7 +336,7 @@ static int xdl_refine_conflicts(xdfenv_t *xe1, xdfenv_t *xe2, xdmerge_t *m,
static int line_contains_alnum(const char *ptr, long size)
{
while (size--)
if (isalnum(*(ptr++)))
if (isalnum((unsigned char)*(ptr++)))
return 1;
return 0;
}

18
xdiff/xutils.c
View File

@ -211,18 +211,18 @@ int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags)
if (l1[i1++] != l2[i2++])
return 0;
skip_ws:
while (i1 < s1 && isspace(l1[i1]))
while (i1 < s1 && XDL_ISSPACE(l1[i1]))
i1++;
while (i2 < s2 && isspace(l2[i2]))
while (i2 < s2 && XDL_ISSPACE(l2[i2]))
i2++;
}
} else if (flags & XDF_IGNORE_WHITESPACE_CHANGE) {
while (i1 < s1 && i2 < s2) {
if (isspace(l1[i1]) && isspace(l2[i2])) {
if (XDL_ISSPACE(l1[i1]) && XDL_ISSPACE(l2[i2])) {
/* Skip matching spaces and try again */
while (i1 < s1 && isspace(l1[i1]))
while (i1 < s1 && XDL_ISSPACE(l1[i1]))
i1++;
while (i2 < s2 && isspace(l2[i2]))
while (i2 < s2 && XDL_ISSPACE(l2[i2]))
i2++;
continue;
}
@ -241,13 +241,13 @@ int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags)
* while there still are characters remaining on both lines.
*/
if (i1 < s1) {
while (i1 < s1 && isspace(l1[i1]))
while (i1 < s1 && XDL_ISSPACE(l1[i1]))
i1++;
if (s1 != i1)
return 0;
}
if (i2 < s2) {
while (i2 < s2 && isspace(l2[i2]))
while (i2 < s2 && XDL_ISSPACE(l2[i2]))
i2++;
return (s2 == i2);
}
@ -260,10 +260,10 @@ static unsigned long xdl_hash_record_with_whitespace(char const **data,
char const *ptr = *data;
for (; ptr < top && *ptr != '\n'; ptr++) {
if (isspace(*ptr)) {
if (XDL_ISSPACE(*ptr)) {
const char *ptr2 = ptr;
int at_eol;
while (ptr + 1 < top && isspace(ptr[1])
while (ptr + 1 < top && XDL_ISSPACE(ptr[1])
&& ptr[1] != '\n')
ptr++;
at_eol = (top <= ptr + 1 || ptr[1] == '\n');