Method expandFilePattern

src/arguments.cpp:462–512

Expands the following patterns: %p process id %t timestamp (yyyyMMdd-hhmmss) %n{MAX} sequence number %{ENV} environment variable

//   %n{MAX}  sequence number
//   %{ENV}   environment variable
const char* Arguments::expandFilePattern(const char* pattern) {
    char* ptr = _buf;
    char* end = _buf + EXTRA_BUF_SIZE - 1;

    while (ptr < end && *pattern != 0) {
        char c = *pattern++;
        if (c == '%') {
            c = *pattern++;
            if (c == 0) {
                break;
            } else if (c == 'p') {
                ptr += snprintf(ptr, end - ptr, "%d", getpid());
                continue;
            } else if (c == 't') {
                time_t timestamp = time(NULL);
                struct tm t;
                localtime_r(&timestamp, &t);
                ptr += snprintf(ptr, end - ptr, "%d%02d%02d-%02d%02d%02d",
                                t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
                                t.tm_hour, t.tm_min, t.tm_sec);
                continue;
            } else if (c == 'n') {
                unsigned int max_files = 0;
                const char* p;
                if (*pattern == '{' && (p = strchr(pattern, '}')) != NULL) {
                    max_files = atoi(pattern + 1);
                    pattern = p + 1;
                }
                ptr += snprintf(ptr, end - ptr, "%u", max_files > 0 ? _file_num % max_files : _file_num);
                continue;
            } else if (c == '{') {
                char env_key[128];
                const char* p = strchr(pattern, '}');
                if (p != NULL && p - pattern < sizeof(env_key)) {
                    memcpy(env_key, pattern, p - pattern);
                    env_key[p - pattern] = 0;
                    const char* env_value = getenv(env_key);
                    if (env_value != NULL) {
                        ptr += snprintf(ptr, end - ptr, "%s", env_value);
                        pattern = p + 1;
                        continue;
                    }
                }
            }
        }
        *ptr++ = c;
    }

    *(ptr < end ? ptr : end) = 0;
    return _buf;
}

Output Arguments::detectOutputFormat(const char* file) {
    const char* ext = strrchr(file, '.');