Take the terminal name from term_options.name

The core hard-coded "wsap_term" for XTVERSION, the XTGETTCAP TN and
name default, and the OSC 9 notification title. A headless library
should take its identity from the host.

term_options.name sets the name. NULL or "" selects "term". term_new()
copies it and returns NULL unless it is 1 to 63 printable ASCII bytes,
since DCS replies echo it. A DCS +p still changes the TN value, and
the XTVERSION and notification defaults keep the host name.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

4 files changed, 22 insertions, 3 deletions

diff --git a/src/escape.c b/src/escape.c
index da0449a..dceb7a6 100644
--- a/src/escape.c
+++ b/src/escape.c
@@ -834,7 +834,9 @@ static inline TERM_ALWAYS_INLINE void dispatch_csi(struct term *t, const struct
     case 'q': {
         if (csi->prefix == '>' && !csi->intermediate &&
             (!csi->nparams || !csi->params[0])) {
-            send_response(t, "\033P>|wsap_term\033\\");
+            char resp[96];
+            snprintf(resp, sizeof(resp), "\033P>|%s\033\\", t->name);
+            send_response(t, resp);
         } else if (!csi->prefix && csi->intermediate == ' ') {
             term_sc_set_cursor_style(t, csi->nparams > 0 ? csi->params[0] : 0);
         }
diff --git a/src/internal.h b/src/internal.h
index 8c02c91..5da114d 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -208,6 +208,8 @@ struct term {
     bool custom_tabs;
 
     char osc_buf[256];
+    /* The host's name. A DCS sequence can change tcap_name, not this. */
+    char name[64];
     char tcap_name[64];
 
     char *osc_heap;
diff --git a/src/osc/misc.c b/src/osc/misc.c
index 5d6b506..74b35cf 100644
--- a/src/osc/misc.c
+++ b/src/osc/misc.c
@@ -53,7 +53,7 @@ void term_osc_misc_dispatch(struct term *t, long code, const char *params)
         break;
     case 9:
         if (t->cb.notify && strncmp(params, "4;", 2))
-            t->cb.notify(t->cb.ud, "wsap_term", params);
+            t->cb.notify(t->cb.ud, t->name, params);
         break;
     case 22:
         free(t->pointer_shape);
diff --git a/src/screen.c b/src/screen.c
index 87d6f2c..e728cec 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -841,12 +841,26 @@ bool term_tables_ready(void)
     return atomic_load_explicit(&tables_state, memory_order_relaxed) == 2;
 }
 
+/* A name is 1 to 63 printable ASCII bytes. DCS replies echo it. */
+static bool name_valid(const char *s)
+{
+    for (size_t i = 0; s[i]; i++) {
+        unsigned char c = (unsigned char)s[i];
+        if (i >= 63 || c < 0x20 || c > 0x7e)
+            return false;
+    }
+    return true;
+}
+
 struct term *term_new(const struct term_options *opt)
 {
     tables_init();
     static const struct term_options defaults;
     if (!opt)
         opt = &defaults;
+    const char *name = opt->name && *opt->name ? opt->name : "term";
+    if (!name_valid(name))
+        return NULL;
     int cols = opt->size.x < 1 ? 80 : opt->size.x;
     int rows = opt->size.y < 1 ? 24 : opt->size.y;
     if (cols > TERM_MAX_COLS)
@@ -856,6 +870,7 @@ struct term *term_new(const struct term_options *opt)
     struct term *t = calloc(1, sizeof(*t));
     if (!t)
         return NULL;
+    memcpy(t->name, name, strlen(name) + 1);
     atomic_init(&t->seq, 0);
     atomic_init(&t->writer_tid, 0);
     t->write_depth = 0;
@@ -902,7 +917,7 @@ struct term *term_new(const struct term_options *opt)
     t->autowrap = true;
     t->charsets[0] = t->charsets[1] = 'B';
     t->saved = term_saved_cursor_initial();
-    memcpy(t->tcap_name, "wsap_term", sizeof("wsap_term"));
+    memcpy(t->tcap_name, t->name, sizeof(t->name));
     term_tabs_default(t);
     t->full_gen = 1;
     memset(t->text_width.lo, 0xFF, sizeof(t->text_width.lo));