Adding upstream version 2.40.upstream/2.40

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 108 insertions, 22 deletions

diff --git a/libmount/src/optstr.c b/libmount/src/optstr.c
index e86b962..7ebc295 100644
--- a/libmount/src/optstr.c
+++ b/libmount/src/optstr.c
@@ -43,13 +43,16 @@ struct libmnt_optloc {
  * Locates the first option that matches @name. The @end is set to the
  * char behind the option (it means ',' or \0).
  *
+ * @ol is optional.
+ *
  * Returns negative number on parse error, 1 when not found and 0 on success.
  */
-static int mnt_optstr_locate_option(char *optstr, const char *name,
+static int mnt_optstr_locate_option(char *optstr,
+					const char *name, size_t namesz,
 					struct libmnt_optloc *ol)
 {
 	char *n;
-	size_t namesz, nsz;
+	size_t nsz;
 	int rc;
 
 	if (!optstr)
@@ -57,27 +60,30 @@ static int mnt_optstr_locate_option(char *optstr, const char *name,
 
 	assert(name);
 
-	namesz = strlen(name);
+	if (!namesz)
+		namesz = strlen(name);
 	if (!namesz)
 		return 1;
 
 	do {
 		rc = ul_optstr_next(&optstr, &n, &nsz,
-					&ol->value, &ol->valsz);
+					ol ? &ol->value : NULL,
+					ol ? &ol->valsz : NULL);
 		if (rc)
 			break;
 
 		if (namesz == nsz && strncmp(n, name, nsz) == 0) {
-			ol->begin = n;
-			ol->end = *(optstr - 1) == ',' ? optstr - 1 : optstr;
-			ol->namesz = nsz;
+			if (ol) {
+				ol->begin = n;
+				ol->end = *(optstr - 1) == ',' ? optstr - 1 : optstr;
+				ol->namesz = nsz;
+			}
 			return 0;
 		}
 	} while(1);
 
 	return rc;
 }
-
 /**
  * mnt_optstr_next_option:
  * @optstr: option string, returns the position of the next option
@@ -223,7 +229,7 @@ int mnt_optstr_get_option(const char *optstr, const char *name,
 	if (!optstr || !name)
 		return -EINVAL;
 
-	rc = mnt_optstr_locate_option((char *) optstr, name, &ol);
+	rc = mnt_optstr_locate_option((char *) optstr, name, 0, &ol);
 	if (!rc) {
 		if (value)
 			*value = ol.value;
@@ -255,7 +261,7 @@ int mnt_optstr_deduplicate_option(char **optstr, const char *name)
 	do {
 		struct libmnt_optloc ol = MNT_INIT_OPTLOC;
 
-		rc = mnt_optstr_locate_option(opt, name, &ol);
+		rc = mnt_optstr_locate_option(opt, name, 0, &ol);
 		if (!rc) {
 			if (begin) {
 				/* remove the previous instance */
@@ -368,7 +374,7 @@ int mnt_optstr_set_option(char **optstr, const char *name, const char *value)
 		return -EINVAL;
 
 	if (*optstr)
-		rc = mnt_optstr_locate_option(*optstr, name, &ol);
+		rc = mnt_optstr_locate_option(*optstr, name, 0, &ol);
 	if (rc < 0)
 		return rc;			/* parse error */
 	if (rc == 1)
@@ -411,7 +417,7 @@ int mnt_optstr_remove_option(char **optstr, const char *name)
 	if (!optstr || !name)
 		return -EINVAL;
 
-	rc = mnt_optstr_locate_option(*optstr, name, &ol);
+	rc = mnt_optstr_locate_option(*optstr, name, 0, &ol);
 	if (rc != 0)
 		return rc;
 
@@ -571,6 +577,51 @@ int mnt_optstr_get_options(const char *optstr, char **subset,
 	return rc;
 }
 
+/*
+ * @optstr: string with comma separated list of options
+ * @wanted: options expected in @optstr
+ * @missing: returns options from @wanted which missing in @optstr (optional)
+ *
+ * Retursn: <0 on error, 0 on missing options, 1 if nothing is missing
+ */
+int mnt_optstr_get_missing(const char *optstr, const char *wanted, char **missing)
+{
+	char *name, *val, *str = (char *) wanted;
+	size_t namesz = 0, valsz = 0;
+	struct ul_buffer buf = UL_INIT_BUFFER;
+	int rc = 0;
+
+	if (!wanted)
+		return 1;
+	if (missing) {
+		/* caller wants data, prepare buffer */
+		ul_buffer_set_chunksize(&buf, strlen(wanted) + 3);	/* to call realloc() only once */
+		*missing = NULL;
+	}
+
+	while (!mnt_optstr_next_option(&str, &name, &namesz, &val, &valsz)) {
+
+		rc = mnt_optstr_locate_option((char *) optstr, name, namesz, NULL);
+		if (rc == 1) {			/* not found */
+			if (!missing)
+				return 0;
+			rc = mnt_buffer_append_option(&buf, name, namesz, val, valsz, 0);
+		}
+		if (rc < 0)
+			break;
+		rc = 0;
+	}
+
+	if (!rc && missing) {
+		if (ul_buffer_is_empty(&buf))
+			rc = 1;
+		else
+			*missing = ul_buffer_get_data(&buf, NULL, NULL);
+	} else
+		ul_buffer_free_data(&buf);
+
+	return rc;
+}
 
 /**
  * mnt_optstr_get_flags:
@@ -910,7 +961,8 @@ int mnt_match_options(const char *optstr, const char *pattern)
 }
 
 #ifdef TEST_PROGRAM
-static int test_append(struct libmnt_test *ts, int argc, char *argv[])
+static int test_append(struct libmnt_test *ts __attribute__((unused)),
+		       int argc, char *argv[])
 {
 	const char *value = NULL, *name;
 	char *optstr;
@@ -933,7 +985,8 @@ static int test_append(struct libmnt_test *ts, int argc, char *argv[])
 	return rc;
 }
 
-static int test_prepend(struct libmnt_test *ts, int argc, char *argv[])
+static int test_prepend(struct libmnt_test *ts __attribute__((unused)),
+			int argc, char *argv[])
 {
 	const char *value = NULL, *name;
 	char *optstr;
@@ -956,7 +1009,8 @@ static int test_prepend(struct libmnt_test *ts, int argc, char *argv[])
 	return rc;
 }
 
-static int test_split(struct libmnt_test *ts, int argc, char *argv[])
+static int test_split(struct libmnt_test *ts __attribute__((unused)),
+		      int argc, char *argv[])
 {
 	char *optstr, *user = NULL, *fs = NULL, *vfs = NULL;
 	int rc;
@@ -982,7 +1036,8 @@ static int test_split(struct libmnt_test *ts, int argc, char *argv[])
 	return rc;
 }
 
-static int test_flags(struct libmnt_test *ts, int argc, char *argv[])
+static int test_flags(struct libmnt_test *ts __attribute__((unused)),
+		      int argc, char *argv[])
 {
 	char *optstr;
 	int rc;
@@ -1010,7 +1065,8 @@ static int test_flags(struct libmnt_test *ts, int argc, char *argv[])
 	return rc;
 }
 
-static int test_apply(struct libmnt_test *ts, int argc, char *argv[])
+static int test_apply(struct libmnt_test *ts __attribute__((unused)),
+		      int argc, char *argv[])
 {
 	char *optstr;
 	int rc, map;
@@ -1042,7 +1098,8 @@ static int test_apply(struct libmnt_test *ts, int argc, char *argv[])
 	return rc;
 }
 
-static int test_set(struct libmnt_test *ts, int argc, char *argv[])
+static int test_set(struct libmnt_test *ts __attribute__((unused)),
+		    int argc, char *argv[])
 {
 	const char *value = NULL, *name;
 	char *optstr;
@@ -1065,7 +1122,8 @@ static int test_set(struct libmnt_test *ts, int argc, char *argv[])
 	return rc;
 }
 
-static int test_get(struct libmnt_test *ts, int argc, char *argv[])
+static int test_get(struct libmnt_test *ts __attribute__((unused)),
+		    int argc, char *argv[])
 {
 	char *optstr;
 	const char *name;
@@ -1094,7 +1152,32 @@ static int test_get(struct libmnt_test *ts, int argc, char *argv[])
 	return rc;
 }
 
-static int test_remove(struct libmnt_test *ts, int argc, char *argv[])
+static int test_missing(struct libmnt_test *ts __attribute__((unused)),
+		    int argc, char *argv[])
+{
+	const char *optstr;
+	const char *wanted;
+	char *missing = NULL;
+	int rc;
+
+	if (argc < 2)
+		return -EINVAL;
+	optstr = argv[1];
+	wanted = argv[2];
+
+	rc = mnt_optstr_get_missing(optstr, wanted, &missing);
+	if (rc == 0)
+		printf("missing: %s\n", missing);
+	else if (rc == 1) {
+		printf("nothing\n");
+		rc = 0;
+	} else
+		printf("parse error: %s\n", optstr);
+	return rc;
+}
+
+static int test_remove(struct libmnt_test *ts __attribute__((unused)),
+		       int argc, char *argv[])
 {
 	const char *name;
 	char *optstr;
@@ -1114,7 +1197,8 @@ static int test_remove(struct libmnt_test *ts, int argc, char *argv[])
 	return rc;
 }
 
-static int test_dedup(struct libmnt_test *ts, int argc, char *argv[])
+static int test_dedup(struct libmnt_test *ts __attribute__((unused)),
+		      int argc, char *argv[])
 {
 	const char *name;
 	char *optstr;
@@ -1134,7 +1218,8 @@ static int test_dedup(struct libmnt_test *ts, int argc, char *argv[])
 	return rc;
 }
 
-static int test_match(struct libmnt_test *ts, int argc, char *argv[])
+static int test_match(struct libmnt_test *ts __attribute__((unused)),
+		      int argc, char *argv[])
 {
 	char *optstr, *pattern;
 
@@ -1156,6 +1241,7 @@ int main(int argc, char *argv[])
 		{ "--prepend",test_prepend,"<optstr> <name> [<value>]  prepend value to optstr" },
 		{ "--set",    test_set,    "<optstr> <name> [<value>]  (un)set value" },
 		{ "--get",    test_get,    "<optstr> <name>            search name in optstr" },
+		{ "--missing",test_missing,"<optstr> <wanted>          what from wanted is missing" },
 		{ "--remove", test_remove, "<optstr> <name>            remove name in optstr" },
 		{ "--dedup",  test_dedup,  "<optstr> <name>            deduplicate name in optstr" },
 		{ "--match",  test_match,  "<optstr> <pattern>         compare optstr with pattern" },