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-rw-r--r--attr.c192
1 files changed, 123 insertions, 69 deletions
diff --git a/attr.c b/attr.c
index f6b3f7e85..33cb4e4d1 100644
--- a/attr.c
+++ b/attr.c
@@ -1,3 +1,12 @@
+/*
+ * Handle git attributes. See gitattributes(5) for a description of
+ * the file syntax, and Documentation/technical/api-gitattributes.txt
+ * for a description of the API.
+ *
+ * One basic design decision here is that we are not going to support
+ * an insanely large number of attributes.
+ */
+
#define NO_THE_INDEX_COMPATIBILITY_MACROS
#include "cache.h"
#include "exec_cmd.h"
@@ -13,12 +22,7 @@ static const char git_attr__unknown[] = "(builtin)unknown";
static const char *attributes_file;
-/*
- * The basic design decision here is that we are not going to have
- * insanely large number of attributes.
- *
- * This is a randomly chosen prime.
- */
+/* This is a randomly chosen prime. */
#define HASHSIZE 257
#ifndef DEBUG_ATTR
@@ -36,6 +40,11 @@ static int attr_nr;
static struct git_attr_check *check_all_attr;
static struct git_attr *(git_attr_hash[HASHSIZE]);
+char *git_attr_name(struct git_attr *attr)
+{
+ return attr->name;
+}
+
static unsigned hash_name(const char *name, int namelen)
{
unsigned val = 0, c;
@@ -50,12 +59,10 @@ static unsigned hash_name(const char *name, int namelen)
static int invalid_attr_name(const char *name, int namelen)
{
/*
- * Attribute name cannot begin with '-' and from
- * [-A-Za-z0-9_.]. We'd specifically exclude '=' for now,
- * as we might later want to allow non-binary value for
- * attributes, e.g. "*.svg merge=special-merge-program-for-svg"
+ * Attribute name cannot begin with '-' and must consist of
+ * characters from [-A-Za-z0-9_.].
*/
- if (*name == '-')
+ if (namelen <= 0 || *name == '-')
return -1;
while (namelen--) {
char ch = *name++;
@@ -103,22 +110,26 @@ struct git_attr *git_attr(const char *name)
return git_attr_internal(name, strlen(name));
}
-/*
- * .gitattributes file is one line per record, each of which is
- *
- * (1) glob pattern.
- * (2) whitespace
- * (3) whitespace separated list of attribute names, each of which
- * could be prefixed with '-' to mean "set to false", '!' to mean
- * "unset".
- */
-
/* What does a matched pattern decide? */
struct attr_state {
struct git_attr *attr;
const char *setto;
};
+/*
+ * One rule, as from a .gitattributes file.
+ *
+ * If is_macro is true, then u.attr is a pointer to the git_attr being
+ * defined.
+ *
+ * If is_macro is false, then u.pattern points at the filename pattern
+ * to which the rule applies. (The memory pointed to is part of the
+ * memory block allocated for the match_attr instance.)
+ *
+ * In either case, num_attr is the number of attributes affected by
+ * this rule, and state is an array listing them. The attributes are
+ * listed as they appear in the file (macros unexpanded).
+ */
struct match_attr {
union {
char *pattern;
@@ -131,8 +142,15 @@ struct match_attr {
static const char blank[] = " \t\r\n";
+/*
+ * Parse a whitespace-delimited attribute state (i.e., "attr",
+ * "-attr", "!attr", or "attr=value") from the string starting at src.
+ * If e is not NULL, write the results to *e. Return a pointer to the
+ * remainder of the string (with leading whitespace removed), or NULL
+ * if there was an error.
+ */
static const char *parse_attr(const char *src, int lineno, const char *cp,
- int *num_attr, struct match_attr *res)
+ struct attr_state *e)
{
const char *ep, *equals;
int len;
@@ -145,7 +163,7 @@ static const char *parse_attr(const char *src, int lineno, const char *cp,
len = equals - cp;
else
len = ep - cp;
- if (!res) {
+ if (!e) {
if (*cp == '-' || *cp == '!') {
cp++;
len--;
@@ -157,9 +175,6 @@ static const char *parse_attr(const char *src, int lineno, const char *cp,
return NULL;
}
} else {
- struct attr_state *e;
-
- e = &(res->state[*num_attr]);
if (*cp == '-' || *cp == '!') {
e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
cp++;
@@ -172,7 +187,6 @@ static const char *parse_attr(const char *src, int lineno, const char *cp,
}
e->attr = git_attr_internal(cp, len);
}
- (*num_attr)++;
return ep + strspn(ep, blank);
}
@@ -180,10 +194,9 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
int lineno, int macro_ok)
{
int namelen;
- int num_attr;
- const char *cp, *name;
+ int num_attr, i;
+ const char *cp, *name, *states;
struct match_attr *res = NULL;
- int pass;
int is_macro;
cp = line + strspn(line, blank);
@@ -212,32 +225,35 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
else
is_macro = 0;
- for (pass = 0; pass < 2; pass++) {
- /* pass 0 counts and allocates, pass 1 fills */
- num_attr = 0;
- cp = name + namelen;
- cp = cp + strspn(cp, blank);
- while (*cp) {
- cp = parse_attr(src, lineno, cp, &num_attr, res);
- if (!cp)
- return NULL;
- }
- if (pass)
- break;
- res = xcalloc(1,
- sizeof(*res) +
- sizeof(struct attr_state) * num_attr +
- (is_macro ? 0 : namelen + 1));
- if (is_macro)
- res->u.attr = git_attr_internal(name, namelen);
- else {
- res->u.pattern = (char *)&(res->state[num_attr]);
- memcpy(res->u.pattern, name, namelen);
- res->u.pattern[namelen] = 0;
- }
- res->is_macro = is_macro;
- res->num_attr = num_attr;
+ states = name + namelen;
+ states += strspn(states, blank);
+
+ /* First pass to count the attr_states */
+ for (cp = states, num_attr = 0; *cp; num_attr++) {
+ cp = parse_attr(src, lineno, cp, NULL);
+ if (!cp)
+ return NULL;
+ }
+
+ res = xcalloc(1,
+ sizeof(*res) +
+ sizeof(struct attr_state) * num_attr +
+ (is_macro ? 0 : namelen + 1));
+ if (is_macro)
+ res->u.attr = git_attr_internal(name, namelen);
+ else {
+ res->u.pattern = (char *)&(res->state[num_attr]);
+ memcpy(res->u.pattern, name, namelen);
+ res->u.pattern[namelen] = 0;
+ }
+ res->is_macro = is_macro;
+ res->num_attr = num_attr;
+
+ /* Second pass to fill the attr_states */
+ for (cp = states, i = 0; *cp; i++) {
+ cp = parse_attr(src, lineno, cp, &(res->state[i]));
}
+
return res;
}
@@ -532,11 +548,18 @@ static void bootstrap_attr_stack(void)
}
}
-static void prepare_attr_stack(const char *path, int dirlen)
+static void prepare_attr_stack(const char *path)
{
struct attr_stack *elem, *info;
- int len;
+ int dirlen, len;
struct strbuf pathbuf;
+ const char *cp;
+
+ cp = strrchr(path, '/');
+ if (!cp)
+ dirlen = 0;
+ else
+ dirlen = cp - path;
strbuf_init(&pathbuf, dirlen+2+strlen(GITATTRIBUTES_FILE));
@@ -555,8 +578,7 @@ static void prepare_attr_stack(const char *path, int dirlen)
* .gitattributes in deeper directories to shallower ones,
* and finally use the built-in set as the default.
*/
- if (!attr_stack)
- bootstrap_attr_stack();
+ bootstrap_attr_stack();
/*
* Pop the "info" one that is always at the top of the stack.
@@ -703,26 +725,30 @@ static int macroexpand_one(int attr_nr, int rem)
return rem;
}
-int git_checkattr(const char *path, int num, struct git_attr_check *check)
+/*
+ * Collect all attributes for path into the array pointed to by
+ * check_all_attr.
+ */
+static void collect_all_attrs(const char *path)
{
struct attr_stack *stk;
- const char *cp;
- int dirlen, pathlen, i, rem;
+ int i, pathlen, rem;
- bootstrap_attr_stack();
+ prepare_attr_stack(path);
for (i = 0; i < attr_nr; i++)
check_all_attr[i].value = ATTR__UNKNOWN;
pathlen = strlen(path);
- cp = strrchr(path, '/');
- if (!cp)
- dirlen = 0;
- else
- dirlen = cp - path;
- prepare_attr_stack(path, dirlen);
rem = attr_nr;
for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
rem = fill(path, pathlen, stk, rem);
+}
+
+int git_check_attr(const char *path, int num, struct git_attr_check *check)
+{
+ int i;
+
+ collect_all_attrs(path);
for (i = 0; i < num; i++) {
const char *value = check_all_attr[check[i].attr->attr_nr].value;
@@ -734,6 +760,34 @@ int git_checkattr(const char *path, int num, struct git_attr_check *check)
return 0;
}
+int git_all_attrs(const char *path, int *num, struct git_attr_check **check)
+{
+ int i, count, j;
+
+ collect_all_attrs(path);
+
+ /* Count the number of attributes that are set. */
+ count = 0;
+ for (i = 0; i < attr_nr; i++) {
+ const char *value = check_all_attr[i].value;
+ if (value != ATTR__UNSET && value != ATTR__UNKNOWN)
+ ++count;
+ }
+ *num = count;
+ *check = xmalloc(sizeof(**check) * count);
+ j = 0;
+ for (i = 0; i < attr_nr; i++) {
+ const char *value = check_all_attr[i].value;
+ if (value != ATTR__UNSET && value != ATTR__UNKNOWN) {
+ (*check)[j].attr = check_all_attr[i].attr;
+ (*check)[j].value = value;
+ ++j;
+ }
+ }
+
+ return 0;
+}
+
void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
{
enum git_attr_direction old = direction;
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-12 09:04:10 +0000