Add string_len() (return length of string) and string_dup_cs() (create a

string from a null-terminated string).  Add test for string_trunc().

include/cryb/string.h

@@ -31,7 +31,9 @@
 #define CRYB_STRING_H_INCLUDED
 
 #define string_new		cryb_string_new
+#define string_len		cryb_string_len
 #define string_dup		cryb_string_dup
+#define string_dup_cs		cryb_string_dup_cs
 #define string_delete		cryb_string_delete
 #define string_expand		cryb_string_expand
 #define string_shrink		cryb_string_shrink
@@ -47,7 +49,9 @@
 typedef struct cryb_string string;
 
 string	*string_new(void);
+size_t	 string_len(const string *);
 string	*string_dup(const string *);
+string	*string_dup_cs(const char *, size_t);
 void	 string_delete(string *);
 int	 string_expand(string *, size_t);
 void	 string_shrink(string *);

include/cryb/wstring.h

@@ -31,7 +31,9 @@
 #define CRYB_WSTRING_H_INCLUDED
 
 #define wstring_new		cryb_wstring_new
+#define wstring_len		cryb_wstring_len
 #define wstring_dup		cryb_wstring_dup
+#define wstring_dup_wcs		cryb_wstring_dup_wcs
 #define wstring_delete		cryb_wstring_delete
 #define wstring_expand		cryb_wstring_expand
 #define wstring_shrink		cryb_wstring_shrink
@@ -47,7 +49,9 @@
 typedef struct cryb_wstring wstring;
 
 wstring	*wstring_new(void);
+size_t	 wstring_len(const wstring *);
 wstring	*wstring_dup(const wstring *);
+wstring	*wstring_dup_wcs(const wchar_t *, size_t);
 void	 wstring_delete(wstring *);
 int	 wstring_expand(wstring *, size_t);
 void	 wstring_shrink(wstring *);

lib/core/_string.c

@@ -66,6 +66,16 @@ string_new(void)
 	return (str);
 }
 
+/*
+ * Return the length of a string
+ */
+size_t
+string_len(const string *str)
+{
+
+	return (str->len);
+}
+
 /*
  * Duplicate an existing string
  */
@@ -85,6 +95,23 @@ string_dup(const string *str)
 	return (newstr);
 }
 
+/*
+ * Duplicate an existing null-terminated string
+ */
+string *
+string_dup_cs(const char_t *cs, size_t len)
+{
+	string *newstr;
+
+	if ((newstr = string_new()) == NULL)
+		return (NULL);
+	if (string_append_cs(newstr, cs, len) < 0) {
+		string_delete(newstr);
+		return (NULL);
+	}
+	return (newstr);
+}
+
 /*
  * Delete a string
  */

lib/core/wstring.c

@@ -44,9 +44,11 @@
 #define string			wstring
 
 #define string_new		wstring_new
+#define string_len		wstring_len
 #define string_expand		wstring_expand
 #define string_shrink		wstring_shrink
 #define string_dup		wstring_dup
+#define string_dup_cs		wstring_dup_wcs
 #define string_delete		wstring_delete
 #define string_trunc		wstring_trunc
 #define string_append_c		wstring_append_wc

t/t__string.c

@@ -135,6 +135,30 @@ t_equal_test(char **desc CRYB_UNUSED, void *arg)
 	return (ret);
 }
 
+
+/***************************************************************************
+ * Miscellaneous functions
+ */
+
+static int
+t_trunc_test(char **desc CRYB_UNUSED, void *arg CRYB_UNUSED)
+{
+	string *s;
+	ssize_t len;
+	int ret;
+
+	if ((s = string_dup_cs(CS("magic ossifrage"), SIZE_MAX)) == NULL)
+		return (0);
+	if (!t_compare_sz(15, (len = string_len(s))))
+		return (0);
+	ret = t_compare_ssz(len, string_trunc(s, SIZE_MAX)) &
+	    t_compare_ssz(len, string_trunc(s, len + 1)) &
+	    t_compare_ssz(len, string_trunc(s, len)) &
+	    t_compare_ssz(len - 1, string_trunc(s, len - 1));
+	string_delete(s);
+	return (ret);
+}
+
 
 /***************************************************************************
  * Boilerplate
@@ -155,6 +179,7 @@ t_prepare(int argc, char *argv[])
 	for (i = 0; i < sizeof t_compare_cases / sizeof *t_compare_cases; ++i)
 		t_add_test(t_equal_test, &t_compare_cases[i],
 		    "%s(%s)", "string_equal", t_compare_cases[i].desc);
+	t_add_test(t_trunc_test, NULL, "string_trunc");
 	return (0);
 }
 

t/t_wstring.c

@@ -47,9 +47,11 @@
 #define string			wstring
 
 #define string_new		wstring_new
+#define string_len		wstring_len
 #define string_expand		wstring_expand
 #define string_shrink		wstring_shrink
 #define string_dup		wstring_dup
+#define string_dup_cs		wstring_dup_wcs
 #define string_delete		wstring_delete
 #define string_trunc		wstring_trunc
 #define string_append_c		wstring_append_wc