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 } 132