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Diffstat (limited to 'sys/ddb/db_variables.c')
| -rw-r--r-- | sys/ddb/db_variables.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/sys/ddb/db_variables.c b/sys/ddb/db_variables.c new file mode 100644 index 0000000..ed9512d --- /dev/null +++ b/sys/ddb/db_variables.c @@ -0,0 +1,186 @@ +/* + * Mach Operating System + * Copyright (c) 1991,1990 Carnegie Mellon University + * All Rights Reserved. + * + * Permission to use, copy, modify and distribute this software and its + * documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR + * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie the + * rights to redistribute these changes. + */ +/* + * HISTORY + * $Log: db_variables.c,v $ + * Revision 1.1 1992/03/25 21:45:33 pace + * Initial revision + * + * Revision 2.3 91/02/05 17:07:19 mrt + * Changed to new Mach copyright + * [91/01/31 16:19:46 mrt] + * + * Revision 2.2 90/08/27 21:53:24 dbg + * New db_read/write_variable functions. Should be used instead + * of dereferencing valuep directly, which might not be a true + * pointer if there is an fcn() access function. + * [90/08/20 af] + * + * Fix declarations. + * Check for trailing garbage after last expression on command line. + * [90/08/10 14:34:54 dbg] + * + * Created. + * [90/07/25 dbg] + * + */ +/* + * Author: David B. Golub, Carnegie Mellon University + * Date: 7/90 + */ + +#include "param.h" +#include "proc.h" +#include <machine/db_machdep.h> + +#include <ddb/db_lex.h> +#include <ddb/db_variables.h> + +extern unsigned int db_maxoff; + +extern int db_radix; +extern int db_max_width; +extern int db_tab_stop_width; + +struct db_variable db_vars[] = { + { "radix", &db_radix, FCN_NULL }, + { "maxoff", (int *)&db_maxoff, FCN_NULL }, + { "maxwidth", &db_max_width, FCN_NULL }, + { "tabstops", &db_tab_stop_width, FCN_NULL }, +}; +struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); + +int +db_find_variable(varp) + struct db_variable **varp; +{ + int t; + struct db_variable *vp; + + t = db_read_token(); + if (t == tIDENT) { + for (vp = db_vars; vp < db_evars; vp++) { + if (!strcmp(db_tok_string, vp->name)) { + *varp = vp; + return (1); + } + } + for (vp = db_regs; vp < db_eregs; vp++) { + if (!strcmp(db_tok_string, vp->name)) { + *varp = vp; + return (1); + } + } + } + db_error("Unknown variable\n"); + return (0); +} + +int +db_get_variable(valuep) + db_expr_t *valuep; +{ + struct db_variable *vp; + + if (!db_find_variable(&vp)) + return (0); + + db_read_variable(vp, valuep); + + return (1); +} + +int +db_set_variable(value) + db_expr_t value; +{ + struct db_variable *vp; + + if (!db_find_variable(&vp)) + return (0); + + db_write_variable(vp, &value); + + return (1); +} + + +db_read_variable(vp, valuep) + struct db_variable *vp; + db_expr_t *valuep; +{ + int (*func)() = vp->fcn; + + if (func == FCN_NULL) + *valuep = *(vp->valuep); + else + (*func)(vp, valuep, DB_VAR_GET); +} + +db_write_variable(vp, valuep) + struct db_variable *vp; + db_expr_t *valuep; +{ + int (*func)() = vp->fcn; + + if (func == FCN_NULL) + *(vp->valuep) = *valuep; + else + (*func)(vp, valuep, DB_VAR_SET); +} + +void +db_set_cmd() +{ + db_expr_t value; + int (*func)(); + struct db_variable *vp; + int t; + + t = db_read_token(); + if (t != tDOLLAR) { + db_error("Unknown variable\n"); + return; + } + if (!db_find_variable(&vp)) { + db_error("Unknown variable\n"); + return; + } + + t = db_read_token(); + if (t != tEQ) + db_unread_token(t); + + if (!db_expression(&value)) { + db_error("No value\n"); + return; + } + if (db_read_token() != tEOL) { + db_error("?\n"); + } + + db_write_variable(vp, &value); +} |
