lib/strutils: add strappend()

Signed-off-by: Karel Zak <kzak@redhat.com>

include/strutils.h

@@ -382,6 +382,9 @@ extern char *strnconcat(const char *s, const char *suffix, size_t b);
 extern char *strconcat(const char *s, const char *suffix);
 extern char *strfconcat(const char *s, const char *format, ...)
 		 __attribute__ ((__format__ (__printf__, 2, 3)));
+
+extern int strappend(char **a, const char *b);
+
 extern const char *split(const char **state, size_t *l, const char *separator, int quoted);
 
 extern int skip_fline(FILE *fp);

lib/strutils.c

@@ -992,6 +992,31 @@ char *strfconcat(const char *s, const char *format, ...)
 	return res;
 }
 
+int strappend(char **a, const char *b)
+{
+	size_t al, bl;
+	char *tmp;
+
+	if (!a)
+		return -EINVAL;
+	if (!b || !*b)
+		return 0;
+	if (!*a) {
+		*a = strdup(b);
+		return !*a ? -ENOMEM : 0;
+	}
+
+	al = strlen(*a);
+	bl = strlen(b);
+
+	tmp = realloc(*a, al + bl + 1);
+	if (!tmp)
+		return -ENOMEM;
+	*a = tmp;
+	memcpy((*a) + al, b, bl + 1);
+	return 0;
+}
+
 static size_t strcspn_escaped(const char *s, const char *reject)
 {
         int escaped = 0;

libmount/src/fs.c

@@ -1369,7 +1369,7 @@ int mnt_fs_append_comment(struct libmnt_fs *fs, const char *comm)
 	if (!fs)
 		return -EINVAL;
 
-	return append_string(&fs->comment, comm);
+	return strappend(&fs->comment, comm);
 }
 
 /**

libmount/src/mountP.h

@@ -95,7 +95,6 @@ extern int mnt_run_test(struct libmnt_test *tests, int argc, char *argv[]);
 
 /* utils.c */
 extern int mnt_valid_tagname(const char *tagname);
-extern int append_string(char **a, const char *b);
 
 extern const char *mnt_statfs_get_fstype(struct statfs *vfs);
 extern int is_file_empty(const char *name);

libmount/src/tab.c

@@ -309,7 +309,7 @@ int mnt_table_append_intro_comment(struct libmnt_table *tb, const char *comm)
 {
 	if (!tb)
 		return -EINVAL;
-	return append_string(&tb->comm_intro, comm);
+	return strappend(&tb->comm_intro, comm);
 }
 
 /**
@@ -350,7 +350,7 @@ int mnt_table_append_trailing_comment(struct libmnt_table *tb, const char *comm)
 {
 	if (!tb)
 		return -EINVAL;
-	return append_string(&tb->comm_tail, comm);
+	return strappend(&tb->comm_tail, comm);
 }
 
 /**

libmount/src/utils.c

@@ -32,31 +32,6 @@
 #include "statfs_magic.h"
 #include "sysfs.h"
 
-int append_string(char **a, const char *b)
-{
-	size_t al, bl;
-	char *tmp;
-
-	assert(a);
-
-	if (!b || !*b)
-		return 0;
-	if (!*a) {
-		*a = strdup(b);
-		return !*a ? -ENOMEM : 0;
-	}
-
-	al = strlen(*a);
-	bl = strlen(b);
-
-	tmp = realloc(*a, al + bl + 1);
-	if (!tmp)
-		return -ENOMEM;
-	*a = tmp;
-	memcpy((*a) + al, b, bl + 1);
-	return 0;
-}
-
 /*
  * Return 1 if the file is not accessible or empty
  */
@@ -1205,18 +1180,6 @@ static int test_endswith(struct libmnt_test *ts, int argc, char *argv[])
 	return 0;
 }
 
-static int test_appendstr(struct libmnt_test *ts, int argc, char *argv[])
-{
-	char *str = strdup(argv[1]);
-	const char *ap = argv[2];
-
-	append_string(&str, ap);
-	printf("new string: '%s'\n", str);
-
-	free(str);
-	return 0;
-}
-
 static int test_mountpoint(struct libmnt_test *ts, int argc, char *argv[])
 {
 	char *path = canonicalize_path(argv[1]),
@@ -1343,7 +1306,6 @@ int main(int argc, char *argv[])
 	{ "--filesystems",   test_filesystems,	   "[<pattern>] list /{etc,proc}/filesystems" },
 	{ "--starts-with",   test_startswith,      "<string> <prefix>" },
 	{ "--ends-with",     test_endswith,        "<string> <prefix>" },
-	{ "--append-string", test_appendstr,       "<string> <appendix>" },
 	{ "--mountpoint",    test_mountpoint,      "<path>" },
 	{ "--cd-parent",     test_chdir,           "<path>" },
 	{ "--kernel-cmdline",test_kernel_cmdline,  "<option> | <option>=" },