util: New xconfstr() wrapper

2 files changed, 29 insertions, 0 deletions

diff --git a/util.c b/util.c
index 19656e9..207e34d 100644
--- a/util.c
+++ b/util.c
@@ -414,3 +414,22 @@ size_t xwrite(int fd, const void *buf, size_t nbytes) {
 
 	return count;
 }
+
+char *xconfstr(int name) {
+	size_t len = confstr(name, NULL, 0);
+	if (len == 0) {
+		return NULL;
+	}
+
+	char *str = malloc(len);
+	if (!str) {
+		return NULL;
+	}
+
+	if (confstr(name, str, len) != len) {
+		free(str);
+		return NULL;
+	}
+
+	return str;
+}
diff --git a/util.h b/util.h
index 4542a46..1a34fba 100644
--- a/util.h
+++ b/util.h
@@ -264,4 +264,14 @@ size_t xread(int fd, void *buf, size_t nbytes);
  */
 size_t xwrite(int fd, const void *buf, size_t nbytes);
 
+/**
+ * Wrapper for confstr() that allocates with malloc().
+ *
+ * @param name
+ *         The ID of the confstr to look up.
+ * @return
+ *         The value of the confstr, or NULL on failure.
+ */
+char *xconfstr(int name);
+
 #endif // BFS_UTIL_H