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Annotation of src/usr.bin/window/context.c, Revision 1.1

1.1     ! deraadt     1: /*     $NetBSD: context.c,v 1.3 1995/09/28 10:34:15 tls 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: #ifndef lint
        !            40: #if 0
        !            41: static char sccsid[] = "@(#)context.c  8.1 (Berkeley) 6/6/93";
        !            42: #else
        !            43: static char rcsid[] = "$NetBSD: context.c,v 1.3 1995/09/28 10:34:15 tls Exp $";
        !            44: #endif
        !            45: #endif /* not lint */
        !            46:
        !            47: #include "value.h"
        !            48: #include "string.h"
        !            49: #include "context.h"
        !            50: #include <fcntl.h>
        !            51:
        !            52: /*
        !            53:  * Context push/pop for nested command files.
        !            54:  */
        !            55:
        !            56: char *malloc();
        !            57:
        !            58: cx_alloc()
        !            59: {
        !            60:        register struct context *xp;
        !            61:
        !            62:        if (cx.x_type != 0) {
        !            63:                xp = (struct context *)
        !            64:                        malloc((unsigned) sizeof (struct context));
        !            65:                if (xp == 0)
        !            66:                        return -1;
        !            67:                *xp = cx;
        !            68:                cx.x_link = xp;
        !            69:                cx.x_type = 0;
        !            70:        }
        !            71:        cx.x_erred = 0;
        !            72:        cx.x_synerred = 0;
        !            73:        cx.x_abort = 0;
        !            74:        return 0;
        !            75: }
        !            76:
        !            77: cx_free()
        !            78: {
        !            79:        struct context *xp;
        !            80:
        !            81:        if ((xp = cx.x_link) != 0) {
        !            82:                cx = *xp;
        !            83:                free((char *)xp);
        !            84:        } else
        !            85:                cx.x_type = 0;
        !            86: }
        !            87:
        !            88: cx_beginfile(filename)
        !            89: char *filename;
        !            90: {
        !            91:        if (cx_alloc() < 0)
        !            92:                return -1;
        !            93:        cx.x_type = X_FILE;
        !            94:        if ((cx.x_filename = str_cpy(filename)) == 0)
        !            95:                goto bad;
        !            96:        cx.x_fp = fopen(filename, "r");
        !            97:        if (cx.x_fp == 0)
        !            98:                goto bad;
        !            99:        (void) fcntl(fileno(cx.x_fp), F_SETFD, 1);
        !           100:        cx.x_bol = 1;
        !           101:        cx.x_lineno = 0;
        !           102:        cx.x_errwin = 0;
        !           103:        cx.x_noerr = 0;
        !           104:        return 0;
        !           105: bad:
        !           106:        if (cx.x_filename != 0)
        !           107:                str_free(cx.x_filename);
        !           108:        cx_free();
        !           109:        return -1;
        !           110: }
        !           111:
        !           112: cx_beginbuf(buf, arg, narg)
        !           113: char *buf;
        !           114: struct value *arg;
        !           115: int narg;
        !           116: {
        !           117:        if (cx_alloc() < 0)
        !           118:                return -1;
        !           119:        cx.x_type = X_BUF;
        !           120:        cx.x_bufp = cx.x_buf = buf;
        !           121:        cx.x_arg = arg;
        !           122:        cx.x_narg = narg;
        !           123:        return 0;
        !           124: }
        !           125:
        !           126: cx_end()
        !           127: {
        !           128:        switch (cx.x_type) {
        !           129:        case X_BUF:
        !           130:                break;
        !           131:        case X_FILE:
        !           132:                (void) fclose(cx.x_fp);
        !           133:                str_free(cx.x_filename);
        !           134:                break;
        !           135:        }
        !           136:        cx_free();
        !           137: }