telnet: Fix telnet segfault when invalid set or help help commands
Silently ignore invalid set ' ' and invalid help help commands. This is the same fix applied by NetBSD in hg commit 1019940:4f248823eaff. PR: 265097 Reported by: Simon Josefsson <simon@josefsson.org> Obtained from: NetBSD hg commit 1019940:4f248823eaff NetBSD PR/56918 MFC after: 1 week
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@ -939,7 +939,7 @@ setcmd(int argc, char *argv[])
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}
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ct = getset(argv[1]);
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if (ct == 0) {
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if (ct == 0 || !(ct->name && ct->name[0] != ' ')) {
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c = GETTOGGLE(argv[1]);
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if (c == 0) {
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fprintf(stderr, "'%s': unknown argument ('set ?' for help).\n",
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@ -1015,7 +1015,7 @@ unsetcmd(int argc, char *argv[])
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while (argc--) {
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name = *argv++;
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ct = getset(name);
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if (ct == 0) {
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if (ct == 0 || !(ct->name && ct->name[0] != ' ')) {
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c = GETTOGGLE(name);
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if (c == 0) {
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fprintf(stderr, "'%s': unknown argument ('unset ?' for help).\n",
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@ -2702,7 +2702,7 @@ help(int argc, char *argv[])
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printf("?Ambiguous help command %s\n", arg);
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else if (c == (Command *)0)
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printf("?Invalid help command %s\n", arg);
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else
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else if (c->help)
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printf("%s\n", c->help);
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}
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return 0;
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