?? escape.c
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#include "call.h"/* * Called when first character of a line is the escape character * (tilde). Read the next character and process. Return -1 * if next character is "terminate" character, 0 if next character * is valid command character (that's been processed), or next * character itself (if the next character is not special). */intdoescape(int remfd){ char c; if (read(STDIN_FILENO, &c, 1) != 1) /* next input char */ err_sys("read error from stdin"); if (c == escapec) { /* two in a row -> process as one */ return(escapec); } else if (c == '.') { /* terminate */ write(STDOUT_FILENO, "~.\n\r", 4); return(-1);#ifdef VSUSP } else if (c == tty_termios()->c_cc[VSUSP]) { /* suspend client */ tty_reset(STDIN_FILENO); /* restore tty mode */ kill(getpid(), SIGTSTP); /* suspend ourself */ tty_raw(STDIN_FILENO); /* and reset tty to raw */ return(0);#endif } else if (c == '#') { /* generate break */ tcsendbreak(remfd, 0); return(0); } else if (c == 't') { /* take a file from remote host */ take(remfd); return(0); } else if (c == 'p') { /* put a file to remote host */ put(remfd); return(0); } return(c); /* not a special character */}
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