use sizeof instead of hardcoded value
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@ -231,7 +231,7 @@ bool run_prog(const char *eventfile, uint32_t eventmask)
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argv0 = ( argv0 == NULL ) ? prog : argv0+1;
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char envvar[30];
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snprintf(envvar, 30, "adhocifyevent=%"PRIu32, eventmask);
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snprintf(envvar, sizeof(envvar), "adhocifyevent=%"PRIu32, eventmask);
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putenv(envvar);
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execl(prog, argv0, (! noappend) ? eventfile : NULL, NULL);
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