14b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten/* 24b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn KastenC non-blocking keyboard input 34b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kastenhttp://stackoverflow.com/questions/448944/c-non-blocking-keyboard-input 44b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten*/ 54b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten 64b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten#include <stdlib.h> 74b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten#include <string.h> 84b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten#include <sys/select.h> 94b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten#include <termios.h> 10e629abc58c2acadc7487ea71c1e063f8f8989199Glenn Kasten#include <unistd.h> 1158432eb9cea995c69b4f905e68b38c1b8216edebGlenn Kasten#include "getch.h" 124b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten 134b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kastenstruct termios orig_termios; 144b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten 154b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kastenvoid reset_terminal_mode() 164b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten{ 174b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten tcsetattr(0, TCSANOW, &orig_termios); 184b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten} 194b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten 204b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kastenvoid set_conio_terminal_mode() 214b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten{ 224b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten struct termios new_termios; 234b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten 244b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten /* take two copies - one for now, one for later */ 254b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten tcgetattr(0, &orig_termios); 264b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten memcpy(&new_termios, &orig_termios, sizeof(new_termios)); 274b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten 284b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten /* register cleanup handler, and set the new terminal mode */ 294b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten atexit(reset_terminal_mode); 304b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten cfmakeraw(&new_termios); 312a6437ce83811c28df37b4cbad171c74e7613892Glenn Kasten new_termios.c_oflag |= OPOST; 324b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten tcsetattr(0, TCSANOW, &new_termios); 334b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten} 344b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten 354b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kastenint kbhit() 364b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten{ 374b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten struct timeval tv = { 0L, 0L }; 384b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten fd_set fds; 394b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten FD_ZERO(&fds); // not in original posting to stackoverflow 404b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten FD_SET(0, &fds); 414b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten return select(1, &fds, NULL, NULL, &tv); 424b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten} 434b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten 444b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kastenint getch() 454b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten{ 464b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten int r; 474b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten unsigned char c; 484b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten if ((r = read(0, &c, sizeof(c))) < 0) { 494b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten return r; 504b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten } else { 514b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten return c; 524b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten } 534b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten} 544b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten 554b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten#if 0 564b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kastenint main(int argc, char *argv[]) 574b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten{ 584b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten set_conio_terminal_mode(); 594b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten 604b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten while (!kbhit()) { 614b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten /* do some work */ 624b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten } 634b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten (void)getch(); /* consume the character */ 644b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten} 654b65ef9efdf5aba01bea89d8cdd64f500560a28dGlenn Kasten#endif 66