Add init method to dstr for initializing directyl from a string

Change the api so _put_ functions that copy in data are named "_append_"
instead.

src/dstr.c

@@ -12,6 +12,18 @@ void uc_dstr_init(struct DStr *str)
     str->str = NULL;
 }
 
+int uc_dstr_init_str(struct DStr *str, const char *init)
+{
+    uc_dstr_init(str);
+    return uc_dstr_append_str(str, init);
+}
+
+int uc_dstr_init_str_sz(struct DStr *str, const char *init, size_t len)
+{
+    uc_dstr_init(str);
+    return uc_dstr_append_str_sz(str, init, len);
+}
+
 void uc_dstr_destroy(struct DStr *str)
 {
 #ifdef DEBUG
@@ -106,7 +118,7 @@ char *uc_dstr_put(struct DStr *str, size_t len)
     return start;
 }
 
-size_t uc_dstr_put_str_filter(struct DStr *str, const char *restrict s, int (*is_x)(int c))
+size_t uc_dstr_append_str_filter(struct DStr *str, const char *restrict s, int (*is_x)(int c))
 {
     size_t len = strlen(s);
     size_t i;
@@ -128,7 +140,7 @@ size_t uc_dstr_put_str_filter(struct DStr *str, const char *restrict s, int (*is
     return idx;
 }
 
-int uc_dstr_put_str_sz(struct DStr *str, const char *restrict s, size_t len)
+int uc_dstr_append_str_sz(struct DStr *str, const char *restrict s, size_t len)
 {
     char *start = uc_dstr_put(str, len);
 
@@ -140,14 +152,14 @@ int uc_dstr_put_str_sz(struct DStr *str, const char *restrict s, size_t len)
     return 0;
 }
 
-int uc_dstr_put_str(struct DStr *str, const char *restrict s)
+int uc_dstr_append_str(struct DStr *str, const char *restrict s)
 {
     size_t len = strlen(s);
 
-    return uc_dstr_put_str_sz(str, s ,len);
+    return uc_dstr_append_str_sz(str, s ,len);
 }
 
-int uc_dstr_put_char(struct DStr *str, char c)
+int uc_dstr_append_char(struct DStr *str, char c)
 {
     char *start = uc_dstr_put(str, 1);
 
@@ -212,11 +224,12 @@ size_t uc_dstr_replace(struct DStr *str, char f, char r)
 void uc_dstr_trim(struct DStr *str)
 {
     size_t spaces;
+    static const char whitespace[] = " \t\n\v\f\r";
 
     uc_dstr_terminate(str);
 
     //spaces at the start
-    spaces = strspn(str->str, " \t\n\v\f\r");
+    spaces = strspn(str->str, whitespace);
     if (spaces > 0) {
         memmove(str->str, str->str + spaces, str->len - spaces);
         str->len -= spaces;
@@ -226,7 +239,7 @@ void uc_dstr_trim(struct DStr *str)
     if (str->len > 0) {
         size_t idx = str->len - 1;
         do {
-            if (strchr(" \t\n\v\f\r", str->str[idx]) == NULL) {
+            if (strchr(whitespace, str->str[idx]) == NULL) {
                 break;
             } else {
                 str->len--;