usr.bin/window/context.c

   1 /*      $NetBSD: context.c,v 1.6 2002/06/14 01:06:52 wiz 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. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)context.c   8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: context.c,v 1.6 2002/06/14 01:06:52 wiz Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <fcntl.h>
  45 #include <stdlib.h>
  46 #include "defs.h"
  47 #include "window_string.h"
  48 #undef EXTERN
  49 #define EXTERN
  50 #include "context.h"
  51 #undef  EXTERN
  52
  53 /*
  54  * Context push/pop for nested command files.
  55  */
  56 int     cx_alloc(void);
  57 void    cx_free(void);
  58
  59 int
  60 cx_alloc(void)
  61 {
  62         struct context *xp;
  63
  64         if (cx.x_type != 0) {
  65                 xp = (struct context *)
  66                         malloc((unsigned) sizeof (struct context));
  67                 if (xp == 0)
  68                         return -1;
  69                 *xp = cx;
  70                 cx.x_link = xp;
  71                 cx.x_type = 0;
  72         }
  73         cx.x_erred = 0;
  74         cx.x_synerred = 0;
  75         cx.x_abort = 0;
  76         return 0;
  77 }
  78
  79 void
  80 cx_free(void)
  81 {
  82         struct context *xp;
  83
  84         if ((xp = cx.x_link) != 0) {
  85                 cx = *xp;
  86                 free((char *)xp);
  87         } else
  88                 cx.x_type = 0;
  89 }
  90
  91 int
  92 cx_beginfile(char *filename)
  93 {
  94         if (cx_alloc() < 0)
  95                 return -1;
  96         cx.x_type = X_FILE;
  97         if ((cx.x_filename = str_cpy(filename)) == 0)
  98                 goto bad;
  99         cx.x_fp = fopen(filename, "r");
 100         if (cx.x_fp == 0)
 101                 goto bad;
 102         (void) fcntl(fileno(cx.x_fp), F_SETFD, 1);
 103         cx.x_bol = 1;
 104         cx.x_lineno = 0;
 105         cx.x_errwin = 0;
 106         cx.x_noerr = 0;
 107         return 0;
 108 bad:
 109         if (cx.x_filename != 0)
 110                 str_free(cx.x_filename);
 111         cx_free();
 112         return -1;
 113 }
 114
 115 int
 116 cx_beginbuf(char *buf, struct value *arg, int narg)
 117 {
 118         if (cx_alloc() < 0)
 119                 return -1;
 120         cx.x_type = X_BUF;
 121         cx.x_bufp = cx.x_buf = buf;
 122         cx.x_arg = arg;
 123         cx.x_narg = narg;
 124         return 0;
 125 }
 126
 127 void
 128 cx_end(void)
 129 {
 130         switch (cx.x_type) {
 131         case X_BUF:
 132                 break;
 133         case X_FILE:
 134                 (void) fclose(cx.x_fp);
 135                 str_free(cx.x_filename);
 136                 break;
 137         }
 138         cx_free();
 139 }