window/context.c

   1 /*      $NetBSD: context.c,v 1.4 1997/11/21 08:35:58 lukem Exp $        */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)context.c   8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: context.c,v 1.4 1997/11/21 08:35:58 lukem Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include <fcntl.h>
  49 #include <stdlib.h>
  50 #include "defs.h"
  51 #include "window_string.h"
  52 #undef EXTERN
  53 #define EXTERN
  54 #include "context.h"
  55 #undef  EXTERN
  56
  57 /*
  58  * Context push/pop for nested command files.
  59  */
  60 int     cx_alloc __P((void));
  61 void    cx_free __P((void));
  62
  63 int
  64 cx_alloc()
  65 {
  66         struct context *xp;
  67
  68         if (cx.x_type != 0) {
  69                 xp = (struct context *)
  70                         malloc((unsigned) sizeof (struct context));
  71                 if (xp == 0)
  72                         return -1;
  73                 *xp = cx;
  74                 cx.x_link = xp;
  75                 cx.x_type = 0;
  76         }
  77         cx.x_erred = 0;
  78         cx.x_synerred = 0;
  79         cx.x_abort = 0;
  80         return 0;
  81 }
  82
  83 void
  84 cx_free()
  85 {
  86         struct context *xp;
  87
  88         if ((xp = cx.x_link) != 0) {
  89                 cx = *xp;
  90                 free((char *)xp);
  91         } else
  92                 cx.x_type = 0;
  93 }
  94
  95 int
  96 cx_beginfile(filename)
  97         char *filename;
  98 {
  99         if (cx_alloc() < 0)
 100                 return -1;
 101         cx.x_type = X_FILE;
 102         if ((cx.x_filename = str_cpy(filename)) == 0)
 103                 goto bad;
 104         cx.x_fp = fopen(filename, "r");
 105         if (cx.x_fp == 0)
 106                 goto bad;
 107         (void) fcntl(fileno(cx.x_fp), F_SETFD, 1);
 108         cx.x_bol = 1;
 109         cx.x_lineno = 0;
 110         cx.x_errwin = 0;
 111         cx.x_noerr = 0;
 112         return 0;
 113 bad:
 114         if (cx.x_filename != 0)
 115                 str_free(cx.x_filename);
 116         cx_free();
 117         return -1;
 118 }
 119
 120 int
 121 cx_beginbuf(buf, arg, narg)
 122         char *buf;
 123         struct value *arg;
 124         int narg;
 125 {
 126         if (cx_alloc() < 0)
 127                 return -1;
 128         cx.x_type = X_BUF;
 129         cx.x_bufp = cx.x_buf = buf;
 130         cx.x_arg = arg;
 131         cx.x_narg = narg;
 132         return 0;
 133 }
 134
 135 void
 136 cx_end()
 137 {
 138         switch (cx.x_type) {
 139         case X_BUF:
 140                 break;
 141         case X_FILE:
 142                 (void) fclose(cx.x_fp);
 143                 str_free(cx.x_filename);
 144                 break;
 145         }
 146         cx_free();
 147 }