Fix funny types used in attribute value representation

It was bothering me a lot that I abused small integer values
casted to (void *) to represent non string values in
gitattributes.  This corrects it by making the type of attribute
values (const char *), and using the address of a few statically
allocated character buffer to denote true/false.  Unset attributes
are represented as having NULLs as their values.

Added in-header documentation to explain how git_checkattr()
routine should be called.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2007-04-18 16:16:37 -07:00
Родитель 3086486d32
Коммит a5e92abde6
6 изменённых файлов: 43 добавлений и 26 удалений

20
attr.c
Просмотреть файл

@ -1,7 +1,13 @@
#include "cache.h"
#include "attr.h"
#define ATTR__UNKNOWN ((void *) -2)
const char git_attr__true[] = "(builtin)true";
const char git_attr__false[] = "\0(builtin)false";
static const char git_attr__unknown[] = "(builtin)unknown";
#define ATTR__TRUE git_attr__true
#define ATTR__FALSE git_attr__false
#define ATTR__UNSET NULL
#define ATTR__UNKNOWN git_attr__unknown
/*
* The basic design decision here is that we are not going to have
@ -102,7 +108,7 @@ struct git_attr *git_attr(const char *name, int len)
/* What does a matched pattern decide? */
struct attr_state {
struct git_attr *attr;
void *setto;
const char *setto;
};
struct match_attr {
@ -262,14 +268,14 @@ static void free_attr_elem(struct attr_stack *e)
struct match_attr *a = e->attrs[i];
int j;
for (j = 0; j < a->num_attr; j++) {
void *setto = a->state[j].setto;
const char *setto = a->state[j].setto;
if (setto == ATTR__TRUE ||
setto == ATTR__FALSE ||
setto == ATTR__UNSET ||
setto == ATTR__UNKNOWN)
;
else
free(setto);
free((char*) setto);
}
free(a);
}
@ -478,8 +484,8 @@ static int fill_one(const char *what, struct match_attr *a, int rem)
for (i = 0; 0 < rem && i < a->num_attr; i++) {
struct git_attr *attr = a->state[i].attr;
void **n = &(check[attr->attr_nr].value);
void *v = a->state[i].setto;
const char **n = &(check[attr->attr_nr].value);
const char *v = a->state[i].setto;
if (*n == ATTR__UNKNOWN) {
debug_set(what, a->u.pattern, attr, v);
@ -547,7 +553,7 @@ int git_checkattr(const char *path, int num, struct git_attr_check *check)
rem = macroexpand(stk, rem);
for (i = 0; i < num; i++) {
void *value = check_all_attr[check[i].attr->attr_nr].value;
const char *value = check_all_attr[check[i].attr->attr_nr].value;
if (value == ATTR__UNKNOWN)
value = ATTR__UNSET;
check[i].value = value;

22
attr.h
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@ -4,21 +4,29 @@
/* An attribute is a pointer to this opaque structure */
struct git_attr;
/*
* Given a string, return the gitattribute object that
* corresponds to it.
*/
struct git_attr *git_attr(const char *, int);
/* Internal use */
#define ATTR__TRUE ((void *) 1)
#define ATTR__FALSE ((void *) 0)
#define ATTR__UNSET ((void *) -1)
extern const char git_attr__true[];
extern const char git_attr__false[];
/* For public to check git_attr_check results */
#define ATTR_TRUE(v) ((v) == ATTR__TRUE)
#define ATTR_FALSE(v) ((v) == ATTR__FALSE)
#define ATTR_UNSET(v) ((v) == ATTR__UNSET)
#define ATTR_TRUE(v) ((v) == git_attr__true)
#define ATTR_FALSE(v) ((v) == git_attr__false)
#define ATTR_UNSET(v) ((v) == NULL)
/*
* Send one or more git_attr_check to git_checkattr(), and
* each 'value' member tells what its value is.
* Unset one is returned as NULL.
*/
struct git_attr_check {
struct git_attr *attr;
void *value;
const char *value;
};
int git_checkattr(const char *path, int, struct git_attr_check *);

Просмотреть файл

@ -42,7 +42,7 @@ int cmd_check_attr(int argc, const char **argv, const char *prefix)
if (git_checkattr(argv[i], cnt, check))
die("git_checkattr died");
for (j = 0; j < cnt; j++) {
void *value = check[j].value;
const char *value = check[j].value;
if (ATTR_TRUE(value))
value = "set";
@ -52,7 +52,7 @@ int cmd_check_attr(int argc, const char **argv, const char *prefix)
value = "unspecified";
write_name_quoted("", 0, argv[i], 1, stdout);
printf(": %s: %s\n", argv[j+1], (char *) value);
printf(": %s: %s\n", argv[j+1], value);
}
}
return 0;

Просмотреть файл

@ -226,7 +226,7 @@ static int git_path_check_crlf(const char *path)
setup_crlf_check(&attr_crlf_check);
if (!git_checkattr(path, 1, &attr_crlf_check)) {
void *value = attr_crlf_check.value;
const char *value = attr_crlf_check.value;
if (ATTR_TRUE(value))
return 1;
else if (ATTR_FALSE(value))

4
diff.c
Просмотреть файл

@ -1069,7 +1069,7 @@ static int file_is_binary(struct diff_filespec *one)
setup_diff_attr_check(&attr_diff_check);
if (!git_checkattr(one->path, 1, &attr_diff_check)) {
void *value = attr_diff_check.value;
const char *value = attr_diff_check.value;
if (ATTR_TRUE(value))
return 0;
else if (ATTR_FALSE(value))
@ -1078,7 +1078,7 @@ static int file_is_binary(struct diff_filespec *one)
;
else
die("unknown value %s given to 'diff' attribute",
(char *)value);
value);
}
if (!one->data) {

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@ -953,7 +953,7 @@ static void initialize_ll_merge(void)
git_config(read_merge_config);
}
static const struct ll_merge_driver *find_ll_merge_driver(void *merge_attr)
static const struct ll_merge_driver *find_ll_merge_driver(const char *merge_attr)
{
struct ll_merge_driver *fn;
const char *name;
@ -986,7 +986,7 @@ static const struct ll_merge_driver *find_ll_merge_driver(void *merge_attr)
return &ll_merge_drv[LL_TEXT_MERGE];
}
static void *git_path_check_merge(const char *path)
static const char *git_path_check_merge(const char *path)
{
static struct git_attr_check attr_merge_check;
@ -994,7 +994,7 @@ static void *git_path_check_merge(const char *path)
attr_merge_check.attr = git_attr("merge", 5);
if (git_checkattr(path, 1, &attr_merge_check))
return ATTR__UNSET;
return NULL;
return attr_merge_check.value;
}
@ -1008,7 +1008,7 @@ static int ll_merge(mmbuffer_t *result_buf,
mmfile_t orig, src1, src2;
char *name1, *name2;
int merge_status;
void *merge_attr;
const char *ll_driver_name;
const struct ll_merge_driver *driver;
name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
@ -1018,11 +1018,14 @@ static int ll_merge(mmbuffer_t *result_buf,
fill_mm(a->sha1, &src1);
fill_mm(b->sha1, &src2);
merge_attr = git_path_check_merge(a->path);
driver = find_ll_merge_driver(merge_attr);
ll_driver_name = git_path_check_merge(a->path);
driver = find_ll_merge_driver(ll_driver_name);
if (index_only && driver->recursive) {
merge_attr = git_attr(driver->recursive, strlen(driver->recursive));
void *merge_attr;
ll_driver_name = driver->recursive;
merge_attr = git_attr(ll_driver_name, strlen(ll_driver_name));
driver = find_ll_merge_driver(merge_attr);
}
merge_status = driver->fn(driver, a->path,