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Annotation of 43BSD/ucb/window/context.c, revision 1.1.1.1

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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