/* * Copyright (c) 1983 Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Edward Wang at The University of California, Berkeley. * * Redistribution and use in source and binary forms are permitted provided * that: (1) source distributions retain this entire copyright notice and * comment, and (2) distributions including binaries display the following * acknowledgement: ``This product includes software developed by the * University of California, Berkeley and its contributors'' in the * documentation or other materials provided with the distribution and in * all advertising materials mentioning features or use of this software. * Neither the name of the University nor the names of its contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #ifndef lint static char sccsid[] = "@(#)context.c 3.12 (Berkeley) 6/6/90"; #endif /* not lint */ #include "value.h" #include "string.h" #include "context.h" /* * Context push/pop for nested command files. */ char *malloc(); cx_alloc() { register struct context *xp; if (cx.x_type != 0) { xp = (struct context *) malloc((unsigned) sizeof (struct context)); if (xp == 0) return -1; *xp = cx; cx.x_link = xp; cx.x_type = 0; } cx.x_erred = 0; cx.x_synerred = 0; cx.x_abort = 0; return 0; } cx_free() { struct context *xp; if ((xp = cx.x_link) != 0) { cx = *xp; free((char *)xp); } else cx.x_type = 0; } cx_beginfile(filename) char *filename; { if (cx_alloc() < 0) return -1; cx.x_type = X_FILE; if ((cx.x_filename = str_cpy(filename)) == 0) goto bad; cx.x_fp = fopen(filename, "r"); if (cx.x_fp == 0) goto bad; cx.x_bol = 1; cx.x_lineno = 0; cx.x_errwin = 0; cx.x_noerr = 0; return 0; bad: if (cx.x_filename != 0) str_free(cx.x_filename); cx_free(); return -1; } cx_beginbuf(buf, arg, narg) char *buf; struct value *arg; int narg; { if (cx_alloc() < 0) return -1; cx.x_type = X_BUF; cx.x_bufp = cx.x_buf = buf; cx.x_arg = arg; cx.x_narg = narg; return 0; } cx_end() { switch (cx.x_type) { case X_BUF: break; case X_FILE: (void) fclose(cx.x_fp); str_free(cx.x_filename); break; } cx_free(); }