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

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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