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cmd: make "hostname" report the name and reject stray arguments

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Typing "hostname" on its own cleared the name: with no argument the copy
loop never ran and the terminating NUL landed at index 0. Report the
current name instead, accept exactly one argument to set it, and reject
anything longer - a name with spaces tokenizes into several words, and
silently keeping only the first one is worse than an error. Walk the
buffer with a pointer, which the compiler codes better than indexing.

Suggested-by: vDorst
This commit is contained in:
d00f
2026-08-04 05:43:05 +02:00
parent e6cd362a1e
commit 13120127df
1 changed files with 21 additions and 10 deletions
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cmd_parser.c
+21 -10
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@@ -1525,17 +1525,28 @@ void cmd_parser(void) __banked
else else
igmp_setup(); // Reverts to default with IP-MC being flooded igmp_setup(); // Reverts to default with IP-MC being flooded
} else if (cmd_compare(0, "hostname")) { } else if (cmd_compare(0, "hostname")) {
/* hostname <text>: rest of the line, sanitized to JSON-safe /* "hostname" alone reports the current name; "hostname <text>"
* printable ASCII (<=23 chars), stored in the shared hostname. */ * sets it, sanitized to JSON-safe printable ASCII. A name with
__xdata uint8_t *hp = &cmd_buffer[cmd_words_b[1]]; * spaces would tokenize into several words - reject it instead
uint8_t hn = 0; * of silently keeping the first one. */
if (cmd_words_len >= 2) if (cmd_words_len == 1) {
while (hn < 23 && hp[hn] && hp[hn] != '\r' && hp[hn] != '\n') { print_string_x(hostname);
hostname[hn] = (hp[hn] < 0x20 || hp[hn] > 0x7e write_char('\n');
|| hp[hn] == '"' || hp[hn] == '\\') ? '.' : hp[hn]; } else if (cmd_words_len == 2) {
hn++; __xdata uint8_t *hp = &cmd_buffer[cmd_words_b[1]];
__xdata char *dst = hostname;
for (uint8_t hn = 0; hn < sizeof(hostname) - 1; hn++) {
uint8_t c = *hp++;
if (c == '\0' || c == '\r' || c == '\n')
break;
if (c < 0x20 || c > 0x7e || c == '"' || c == '\\')
c = '.';
*dst++ = c;
} }
hostname[hn] = 0; *dst = '\0';
} else {
print_string("Error: hostname [name] - the name must not contain spaces\n");
}
} else if (cmd_compare(0, "stp")) { } else if (cmd_compare(0, "stp")) {
if (cmd_compare(1, "on")) { if (cmd_compare(1, "on")) {
print_string("STP enabled\n"); print_string("STP enabled\n");