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Annotation of 43BSD/contrib/X/xterm/buf.c, revision 1.1.1.1

1.1       root        1: #include <X/mit-copyright.h>
                      2: 
                      3: /* Copyright    Massachusetts Institute of Technology    1984, 1985    */
                      4: 
                      5: /* buf.c */
                      6: 
                      7: #ifndef lint
                      8: static char *rcsid_buf_c = "$Header: buf.c,v 10.8 86/02/01 16:05:37 tony Rel $";
                      9: #endif lint
                     10: 
                     11: #include <stdio.h>
                     12: #include <errno.h>
                     13: #include <X/Xlib.h>
                     14: #include "ptyx.h"
                     15: #include <ctype.h>
                     16: 
                     17: extern int errno;
                     18: extern int am_slave;
                     19: 
                     20: /*
                     21:  * If no input available, returns -1. Else, reads characters from
                     22:  * trmbuf->fildes and puts them in the buffer, then returns first
                     23:  * character read.
                     24:  */
                     25: fill(trmbuf)
                     26: register Buffer *trmbuf;
                     27: {
                     28: #ifdef JUMPSCROLL
                     29:        extern Terminal term;
                     30:        register Screen *screen = &term.screen;
                     31: 
                     32:        if (screen->scroll_amt)
                     33:                FlushScroll(screen);
                     34: #endif JUMPSCROLL
                     35:        trmbuf->ptr = &trmbuf->buf[0];
                     36:        trmbuf->cnt = read(trmbuf->fildes, trmbuf->ptr, BUF_SIZE);
                     37: 
                     38:        if (trmbuf->cnt == -1) {
                     39:                if (errno != EWOULDBLOCK) {
                     40:                        if (errno == EIO && am_slave) exit(0);  /* pty closed */
                     41:                        else Panic("fill: read returned unexpected error (%d)\n",
                     42:                                errno);
                     43:                }
                     44:                return(-1);
                     45:        }
                     46:        
                     47:        if (--trmbuf->cnt < 0)
                     48:                Panic("fill: read returned %d\n", trmbuf->cnt+1);
                     49:        return(*trmbuf->ptr++ & 0177);
                     50: }

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