A few more ptrlen functions.

ptrlen_contains and ptrlen_contains_only are useful for checking that
a string is composed entirely of certain characters, or avoids them.

ptrlen_end makes a pointer to the byte just past the end of the
specified string. And it can be used with make_ptrlen_startend, which
makes a ptrlen out of two pointers instead of a pointer and a length.

1 files changed, 16 insertions, 0 deletions

diff --git a/utils/ptrlen.c b/utils/ptrlen.c
index 7d4e12ec..37972e49 100644
--- a/utils/ptrlen.c
+++ b/utils/ptrlen.c
@@ -54,6 +54,22 @@ bool ptrlen_endswith(ptrlen whole, ptrlen suffix, ptrlen *tail)
     return false;
 }
 
+bool ptrlen_contains(ptrlen input, const char *characters)
+{
+    for (const char *p = input.ptr, *end = p + input.len; p < end; p++)
+        if (strchr(characters, *p))
+            return true;
+    return false;
+}
+
+bool ptrlen_contains_only(ptrlen input, const char *characters)
+{
+    for (const char *p = input.ptr, *end = p + input.len; p < end; p++)
+        if (!strchr(characters, *p))
+            return false;
+    return true;
+}
+
 ptrlen ptrlen_get_word(ptrlen *input, const char *separators)
 {
     const char *p = input->ptr, *end = p + input->len;