usr.bin/window/context.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Edward Wang at The University of California, Berkeley.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)context.c        8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/context.c,v 1.1.1.1.14.2 2001/05/17 09:45:00 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/context.c,v 1.4 2005/04/15 17:55:29 drhodus Exp $
  39  */
  40
  41 #include <fcntl.h>
  42 #include <stdlib.h>
  43
  44 #include "value.h"
  45 #include "mystring.h"
  46 #include "context.h"
  47
  48 /*
  49  * Context push/pop for nested command files.
  50  */
  51
  52 cx_alloc()
  53 {
  54         struct context *xp;
  55
  56         if (cx.x_type != 0) {
  57                 xp = (struct context *)
  58                         malloc((unsigned) sizeof (struct context));
  59                 if (xp == 0)
  60                         return -1;
  61                 *xp = cx;
  62                 cx.x_link = xp;
  63                 cx.x_type = 0;
  64         }
  65         cx.x_erred = 0;
  66         cx.x_synerred = 0;
  67         cx.x_abort = 0;
  68         return 0;
  69 }
  70
  71 cx_free()
  72 {
  73         struct context *xp;
  74
  75         if ((xp = cx.x_link) != 0) {
  76                 cx = *xp;
  77                 free((char *)xp);
  78         } else
  79                 cx.x_type = 0;
  80 }
  81
  82 cx_beginfile(filename)
  83 char *filename;
  84 {
  85         if (cx_alloc() < 0)
  86                 return -1;
  87         cx.x_type = X_FILE;
  88         if ((cx.x_filename = str_cpy(filename)) == 0)
  89                 goto bad;
  90         cx.x_fp = fopen(filename, "r");
  91         if (cx.x_fp == 0)
  92                 goto bad;
  93         (void) fcntl(fileno(cx.x_fp), F_SETFD, 1);
  94         cx.x_bol = 1;
  95         cx.x_lineno = 0;
  96         cx.x_errwin = 0;
  97         cx.x_noerr = 0;
  98         return 0;
  99 bad:
 100         if (cx.x_filename != 0)
 101                 str_free(cx.x_filename);
 102         cx_free();
 103         return -1;
 104 }
 105
 106 cx_beginbuf(buf, arg, narg)
 107 char *buf;
 108 struct value *arg;
 109 int narg;
 110 {
 111         if (cx_alloc() < 0)
 112                 return -1;
 113         cx.x_type = X_BUF;
 114         cx.x_bufp = cx.x_buf = buf;
 115         cx.x_arg = arg;
 116         cx.x_narg = narg;
 117         return 0;
 118 }
 119
 120 cx_end()
 121 {
 122         switch (cx.x_type) {
 123         case X_BUF:
 124                 break;
 125         case X_FILE:
 126                 (void) fclose(cx.x_fp);
 127                 str_free(cx.x_filename);
 128                 break;
 129         }
 130         cx_free();
 131 }