Annotation of sys/ddb/db_variables.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: db_variables.c,v 1.12 2006/07/06 19:05:58 miod Exp $ */
! 2: /* $NetBSD: db_variables.c,v 1.8 1996/02/05 01:57:19 christos Exp $ */
! 3:
! 4: /*
! 5: * Mach Operating System
! 6: * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University
! 7: * All Rights Reserved.
! 8: *
! 9: * Permission to use, copy, modify and distribute this software and its
! 10: * documentation is hereby granted, provided that both the copyright
! 11: * notice and this permission notice appear in all copies of the
! 12: * software, derivative works or modified versions, and any portions
! 13: * thereof, and that both notices appear in supporting documentation.
! 14: *
! 15: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
! 16: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
! 17: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
! 18: *
! 19: * Carnegie Mellon requests users of this software to return to
! 20: *
! 21: * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
! 22: * School of Computer Science
! 23: * Carnegie Mellon University
! 24: * Pittsburgh PA 15213-3890
! 25: *
! 26: * any improvements or extensions that they make and grant Carnegie Mellon
! 27: * the rights to redistribute these changes.
! 28: */
! 29:
! 30: #include <sys/param.h>
! 31: #include <sys/proc.h>
! 32:
! 33: #include <uvm/uvm_extern.h>
! 34:
! 35: #include <machine/db_machdep.h>
! 36:
! 37: #include <ddb/db_lex.h>
! 38: #include <ddb/db_variables.h>
! 39: #include <ddb/db_command.h>
! 40: #include <ddb/db_sym.h>
! 41: #include <ddb/db_extern.h>
! 42: #include <ddb/db_var.h>
! 43:
! 44: struct db_variable db_vars[] = {
! 45: { "radix", (long *)&db_radix, db_var_rw_int },
! 46: { "maxoff", (long *)&db_maxoff, db_var_rw_int },
! 47: { "maxwidth", (long *)&db_max_width, db_var_rw_int },
! 48: { "tabstops", (long *)&db_tab_stop_width, db_var_rw_int },
! 49: { "lines", (long *)&db_max_line, db_var_rw_int },
! 50: { "log", (long *)&db_log, db_var_rw_int }
! 51: };
! 52: struct db_variable *db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
! 53:
! 54: int
! 55: db_find_variable(struct db_variable **varp)
! 56: {
! 57: int t;
! 58: struct db_variable *vp;
! 59:
! 60: t = db_read_token();
! 61: if (t == tIDENT) {
! 62: for (vp = db_vars; vp < db_evars; vp++) {
! 63: if (!strcmp(db_tok_string, vp->name)) {
! 64: *varp = vp;
! 65: return (1);
! 66: }
! 67: }
! 68: for (vp = db_regs; vp < db_eregs; vp++) {
! 69: if (!strcmp(db_tok_string, vp->name)) {
! 70: *varp = vp;
! 71: return (1);
! 72: }
! 73: }
! 74: }
! 75: db_error("Unknown variable\n");
! 76: /*NOTREACHED*/
! 77: return 0;
! 78: }
! 79:
! 80: int
! 81: db_get_variable(db_expr_t *valuep)
! 82: {
! 83: struct db_variable *vp;
! 84:
! 85: if (!db_find_variable(&vp))
! 86: return (0);
! 87:
! 88: db_read_variable(vp, valuep);
! 89:
! 90: return (1);
! 91: }
! 92:
! 93: int
! 94: db_set_variable(db_expr_t value)
! 95: {
! 96: struct db_variable *vp;
! 97:
! 98: if (!db_find_variable(&vp))
! 99: return (0);
! 100:
! 101: db_write_variable(vp, &value);
! 102:
! 103: return (1);
! 104: }
! 105:
! 106:
! 107: void
! 108: db_read_variable(struct db_variable *vp, db_expr_t *valuep)
! 109: {
! 110: int (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn;
! 111:
! 112: if (func == FCN_NULL)
! 113: *valuep = *(vp->valuep);
! 114: else
! 115: (*func)(vp, valuep, DB_VAR_GET);
! 116: }
! 117:
! 118: void
! 119: db_write_variable(struct db_variable *vp, db_expr_t *valuep)
! 120: {
! 121: int (*func)(struct db_variable *, db_expr_t *, int) = vp->fcn;
! 122:
! 123: if (func == FCN_NULL)
! 124: *(vp->valuep) = *valuep;
! 125: else
! 126: (*func)(vp, valuep, DB_VAR_SET);
! 127: }
! 128:
! 129: /*ARGSUSED*/
! 130: void
! 131: db_set_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
! 132: {
! 133: db_expr_t value;
! 134: struct db_variable *vp;
! 135: int t;
! 136:
! 137: t = db_read_token();
! 138: if (t != tDOLLAR) {
! 139: db_error("Unknown variable\n");
! 140: /*NOTREACHED*/
! 141: }
! 142: if (!db_find_variable(&vp)) {
! 143: db_error("Unknown variable\n");
! 144: /*NOTREACHED*/
! 145: }
! 146:
! 147: t = db_read_token();
! 148: if (t != tEQ)
! 149: db_unread_token(t);
! 150:
! 151: if (!db_expression(&value)) {
! 152: db_error("No value\n");
! 153: /*NOTREACHED*/
! 154: }
! 155: if (db_read_token() != tEOL) {
! 156: db_error("?\n");
! 157: /*NOTREACHED*/
! 158: }
! 159:
! 160: db_write_variable(vp, &value);
! 161: }
! 162:
! 163: int
! 164: db_var_rw_int(struct db_variable *var, db_expr_t *expr, int mode)
! 165: {
! 166:
! 167: if (mode == DB_VAR_SET)
! 168: *var->valuep = *(int *)expr;
! 169: else
! 170: *expr = *(int *)var->valuep;
! 171: return (0);
! 172: }
! 173:
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