Add u32_is_blank() in 'unicode' module

src/unicode.c

@@ -77,6 +77,22 @@ int is_empty(const uint32_t *text)
 
 
 
+int u32_is_blank(const uint32_t *text)
+{
+    if (is_empty(text)) {
+        return 1;
+    }
+
+    for (const uint32_t *c = text; *c != char_nul; c++) {
+        if (!is_blank(*c)) {
+            return 0;
+        }
+    }
+    return 1;
+}
+
+
+
 int is_ascii_printable(const ucs4_t c)
 {
     return c >= 0x20 && c < 0x7f;

src/unicode.h

@@ -80,6 +80,16 @@ void set_char_at(uint32_t *text, const size_t idx, const ucs4_t char_to_set);
 int is_empty(const uint32_t *text);
 
 
+/**
+ *  Determine if a string consists entirely of blanks.
+ *
+ *  @param text the string to check, NULL/empty strings count as blank
+ *  @return > 0: the string is blank, empty, or NULL;
+ *         == 0: the string contains at least 1 non-blank character
+ */
+int u32_is_blank(const uint32_t *text);
+
+
 int is_ascii_printable(const ucs4_t c);