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Annotation of 43BSD/ucb/window/context.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)context.c  3.7 4/24/85";
        !             3: #endif
        !             4: 
        !             5: /*
        !             6:  * Copyright (c) 1983 Regents of the University of California,
        !             7:  * All rights reserved.  Redistribution permitted subject to
        !             8:  * the terms of the Berkeley Software License Agreement.
        !             9:  */
        !            10: 
        !            11: #include <stdio.h>
        !            12: #include "value.h"
        !            13: #include "string.h"
        !            14: #include "context.h"
        !            15: 
        !            16: /*
        !            17:  * Context push/pop for nested command files.
        !            18:  */
        !            19: 
        !            20: char *malloc();
        !            21: 
        !            22: cx_alloc()
        !            23: {
        !            24:        register struct context *xp;
        !            25: 
        !            26:        if (cx.x_type != 0) {
        !            27:                xp = (struct context *)
        !            28:                        malloc((unsigned) sizeof (struct context));
        !            29:                if (xp == 0)
        !            30:                        return -1;
        !            31:                *xp = cx;
        !            32:                cx.x_link = xp;
        !            33:                cx.x_type = 0;
        !            34:        }
        !            35:        cx.x_erred = 0;
        !            36:        cx.x_synerred = 0;
        !            37:        cx.x_abort = 0;
        !            38:        return 0;
        !            39: }
        !            40: 
        !            41: cx_free()
        !            42: {
        !            43:        struct context *xp;
        !            44: 
        !            45:        if ((xp = cx.x_link) != 0) {
        !            46:                cx = *xp;
        !            47:                free((char *)xp);
        !            48:        } else
        !            49:                cx.x_type = 0;
        !            50: }
        !            51: 
        !            52: cx_beginfile(filename)
        !            53: char *filename;
        !            54: {
        !            55:        if (cx_alloc() < 0)
        !            56:                return -1;
        !            57:        cx.x_type = X_FILE;
        !            58:        if ((cx.x_filename = str_cpy(filename)) == 0)
        !            59:                goto bad;
        !            60:        cx.x_fp = fopen(filename, "r");
        !            61:        if (cx.x_fp == 0)
        !            62:                goto bad;
        !            63:        cx.x_bol = 1;
        !            64:        cx.x_lineno = 0;
        !            65:        cx.x_errwin = 0;
        !            66:        cx.x_noerr = 0;
        !            67:        return 0;
        !            68: bad:
        !            69:        if (cx.x_filename != 0)
        !            70:                str_free(cx.x_filename);
        !            71:        cx_free();
        !            72:        return -1;
        !            73: }
        !            74: 
        !            75: cx_beginbuf(buf, arg, narg)
        !            76: char *buf;
        !            77: struct value *arg;
        !            78: int narg;
        !            79: {
        !            80:        if (cx_alloc() < 0)
        !            81:                return -1;
        !            82:        cx.x_type = X_BUF;
        !            83:        cx.x_bufp = cx.x_buf = buf;
        !            84:        cx.x_arg = arg;
        !            85:        cx.x_narg = narg;
        !            86:        return 0;
        !            87: }
        !            88: 
        !            89: cx_end()
        !            90: {
        !            91:        switch (cx.x_type) {
        !            92:        case X_BUF:
        !            93:                break;
        !            94:        case X_FILE:
        !            95:                (void) fclose(cx.x_fp);
        !            96:                str_free(cx.x_filename);
        !            97:                break;
        !            98:        }
        !            99:        cx_free();
        !           100: }

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