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784e3de7cd
passwd, ps, purge, shutdown, stty, upper, and vi. These sources are for the versions of the utils shipped with GNO v2.0.4.
87 lines
1.4 KiB
C
87 lines
1.4 KiB
C
/*
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* Routines dealing with getting input from the keyboard (i.e. from the user).
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*/
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#pragma noroot
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#include "less.h"
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#include <fcntl.h>
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#include <stdio.h>
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#if __MSDOS__
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#include <io.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <signal.h>
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#endif
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#ifdef _ORCAC_
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segment "LoadSegONE";
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#endif
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static int tty;
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/*
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* Open keyboard for input.
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*/
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public void
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open_getchr(void)
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{
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#if __MDDOS__
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/*
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* Open a new handle to CON: in binary mode
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* for unbuffered keyboard read.
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*/
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tty = open("CON", O_RDONLY|O_BINARY);
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#else
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/*
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* Try /dev/tty.
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* If that doesn't work, use file descriptor 2,
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* which in Unix is usually attached to the screen,
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* but also usually lets you read from the keyboard.
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*/
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tty = open(".tty", O_RDWR);
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if (tty < 0)
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tty = 2;
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#endif
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}
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/*
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* Get a character from the keyboard.
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*/
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public int
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getchr(void)
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{
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char c;
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int result;
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do
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{
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result = iread(tty, &c, sizeof(char));
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if (result == READ_INTR)
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return (READ_INTR);
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if (result < 0)
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{
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/*
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* Don't call error() here,
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* because error calls getchr!
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*/
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quit(1);
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}
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#if __MSDOS__
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/*
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* In raw read, we don't see ^C so look here for it.
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*/
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if (c == '\003')
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raise(SIGINT);
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#endif
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/*
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* Various parts of the program cannot handle
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* an input character of '\0'.
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* If a '\0' was actually typed, convert it to '\200' here.
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*/
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if (c == '\0')
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c = '\200';
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} while (result != 1);
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return (c);
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}
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