Check each char read to see whether it is a form feed; if so, increment the page counter.
检查每个读取的字符是否为换页符；若是，则增加页计数器。
This tells selpg to look for form feed characters in the input and treat them as the page delimiters.
该命令告诉selpg在输入中寻找换页符，并将其作为页定界符处理。
Printers recognize the form-feed character and automatically advance the print head by the required number of lines necessary to begin the next line of data on a new page.
打印机会识别换页符并自动根据在新的页开始新行所需的行数移动打印头。
The logic used for form-feed-delimited pages is roughly the same, but slightly simpler, as there is no need for a line counter: Read char by char using the getc library function.
用于换页定界的页的逻辑大体上相同，只是稍稍简单一些，因为不需要行计数器：使用getc库函数逐个读取字符。
A printer which does form - feed function automatically.
一种具有自动换页功能的打印机。
Matches any white space character including space, tab, form - feed, and so on.
匹配任何空白字元，包括空格、制表符、换页符等。
Matches any white space character including space, tab, form - feed, and so on.
匹配任何空白字元，包括空格、制表符、换页符等。
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