usr.bin/window/context.c

   1 /*      @(#)context.c   8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: context.c,v 1.7 2003/08/07 11:17:24 agc Exp $  */
   3
   4 /*
   5  * Copyright (c) 1983, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Edward Wang at The University of California, Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <fcntl.h>
  37 #include <stdlib.h>
  38 #include "defs.h"
  39 #include "window_string.h"
  40 #undef EXTERN
  41 #define EXTERN
  42 #include "context.h"
  43 #undef  EXTERN
  44
  45 /*
  46  * Context push/pop for nested command files.
  47  */
  48 int     cx_alloc(void);
  49 void    cx_free(void);
  50
  51 int
  52 cx_alloc(void)
  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 == NULL)
  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 void
  72 cx_free(void)
  73 {
  74         struct context *xp;
  75
  76         if ((xp = cx.x_link) != NULL) {
  77                 cx = *xp;
  78                 free((char *)xp);
  79         } else
  80                 cx.x_type = 0;
  81 }
  82
  83 int
  84 cx_beginfile(char *filename)
  85 {
  86         if (cx_alloc() < 0)
  87                 return -1;
  88         cx.x_type = X_FILE;
  89         if ((cx.x_filename = str_cpy(filename)) == 0)
  90                 goto bad;
  91         cx.x_fp = fopen(filename, "r");
  92         if (cx.x_fp == 0)
  93                 goto bad;
  94         (void) fcntl(fileno(cx.x_fp), F_SETFD, 1);
  95         cx.x_bol = 1;
  96         cx.x_lineno = 0;
  97         cx.x_errwin = 0;
  98         cx.x_noerr = 0;
  99         return 0;
 100 bad:
 101         if (cx.x_filename != 0)
 102                 str_free(cx.x_filename);
 103         cx_free();
 104         return -1;
 105 }
 106
 107 int
 108 cx_beginbuf(char *buf, struct value *arg, int narg)
 109 {
 110         if (cx_alloc() < 0)
 111                 return -1;
 112         cx.x_type = X_BUF;
 113         cx.x_bufp = cx.x_buf = buf;
 114         cx.x_arg = arg;
 115         cx.x_narg = narg;
 116         return 0;
 117 }
 118
 119 void
 120 cx_end(void)
 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 }