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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)context.c  3.9 (Berkeley) 6/29/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include <stdio.h>
        !            23: #include "value.h"
        !            24: #include "string.h"
        !            25: #include "context.h"
        !            26: 
        !            27: /*
        !            28:  * Context push/pop for nested command files.
        !            29:  */
        !            30: 
        !            31: char *malloc();
        !            32: 
        !            33: cx_alloc()
        !            34: {
        !            35:        register struct context *xp;
        !            36: 
        !            37:        if (cx.x_type != 0) {
        !            38:                xp = (struct context *)
        !            39:                        malloc((unsigned) sizeof (struct context));
        !            40:                if (xp == 0)
        !            41:                        return -1;
        !            42:                *xp = cx;
        !            43:                cx.x_link = xp;
        !            44:                cx.x_type = 0;
        !            45:        }
        !            46:        cx.x_erred = 0;
        !            47:        cx.x_synerred = 0;
        !            48:        cx.x_abort = 0;
        !            49:        return 0;
        !            50: }
        !            51: 
        !            52: cx_free()
        !            53: {
        !            54:        struct context *xp;
        !            55: 
        !            56:        if ((xp = cx.x_link) != 0) {
        !            57:                cx = *xp;
        !            58:                free((char *)xp);
        !            59:        } else
        !            60:                cx.x_type = 0;
        !            61: }
        !            62: 
        !            63: cx_beginfile(filename)
        !            64: char *filename;
        !            65: {
        !            66:        if (cx_alloc() < 0)
        !            67:                return -1;
        !            68:        cx.x_type = X_FILE;
        !            69:        if ((cx.x_filename = str_cpy(filename)) == 0)
        !            70:                goto bad;
        !            71:        cx.x_fp = fopen(filename, "r");
        !            72:        if (cx.x_fp == 0)
        !            73:                goto bad;
        !            74:        cx.x_bol = 1;
        !            75:        cx.x_lineno = 0;
        !            76:        cx.x_errwin = 0;
        !            77:        cx.x_noerr = 0;
        !            78:        return 0;
        !            79: bad:
        !            80:        if (cx.x_filename != 0)
        !            81:                str_free(cx.x_filename);
        !            82:        cx_free();
        !            83:        return -1;
        !            84: }
        !            85: 
        !            86: cx_beginbuf(buf, arg, narg)
        !            87: char *buf;
        !            88: struct value *arg;
        !            89: int narg;
        !            90: {
        !            91:        if (cx_alloc() < 0)
        !            92:                return -1;
        !            93:        cx.x_type = X_BUF;
        !            94:        cx.x_bufp = cx.x_buf = buf;
        !            95:        cx.x_arg = arg;
        !            96:        cx.x_narg = narg;
        !            97:        return 0;
        !            98: }
        !            99: 
        !           100: cx_end()
        !           101: {
        !           102:        switch (cx.x_type) {
        !           103:        case X_BUF:
        !           104:                break;
        !           105:        case X_FILE:
        !           106:                (void) fclose(cx.x_fp);
        !           107:                str_free(cx.x_filename);
        !           108:                break;
        !           109:        }
        !           110:        cx_free();
        !           111: }

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