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Unbuffered I/O in ANSI C

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问题 For the sake of education, and programming practice, I'd like to write a simple library that can handle raw keyboard input, and output to the terminal in 'real time'. I'd like to stick with ansi C as much as possible, I just have no idea where to start something like this. I've done several google searches, and 99% of the results use libraries, or are for C++. I'd really like to get it working in windows, then port it to OSX when I have the time. 回答1: Sticking with Standard C as much as

setvbuf not able to make stdin unbuffered

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My main intention was to make getchar return as soon as it gets a character instead of waiting for the ENTER key. I tried this int main() { setvbuf(stdin,NULL,_IONBF,0); getchar(); return 0; } Comparing this with the prototype of setvbuf setvbuf ( FILE * stream, char * buffer, int mode, size_t size ); it should set stdin to unbuffered mode. But still getchar() keeps waiting for ENTER I've seen related posts like this Printing while reading characters in C which are suggesting alternate methods to make stdin unbuffered. But I am curious to know as to why setvbuf method does not work Jonathan

setvbuf not able to make stdin unbuffered

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问题 My main intention was to make getchar return as soon as it gets a character instead of waiting for the ENTER key. I tried this int main() { setvbuf(stdin,NULL,_IONBF,0); getchar(); return 0; } Comparing this with the prototype of setvbuf setvbuf ( FILE * stream, char * buffer, int mode, size_t size ); it should set stdin to unbuffered mode. But still getchar() keeps waiting for ENTER I\'ve seen related posts like this Printing while reading characters in C which are suggesting alternate