/*-
 * SPDX-License-Identifier: MIT-CMU
 *
 * 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.
 */
/*
 *      Author: David B. Golub, Carnegie Mellon University
 *      Date:   7/90
 */

#include <sys/param.h>
#include <sys/systm.h>

#include <ddb/ddb.h>

#include <ddb/db_lex.h>
#include <ddb/db_output.h>
#include <ddb/db_command.h>
#include <ddb/db_sym.h>
#include <ddb/db_access.h>

static char     db_examine_format[TOK_STRING_SIZE] = "x";

static void     db_examine(db_addr_t, char *, int);
static void     db_search(db_addr_t, int, db_expr_t, db_expr_t, u_int);

/*
 * Examine (print) data.
 */
/*ARGSUSED*/
void
db_examine_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
{
        if (modif[0] != '\0')
            db_strcpy(db_examine_format, modif);

        if (count == -1)
            count = 1;

        db_examine((db_addr_t) addr, db_examine_format, count);
}

static void
db_examine(db_addr_t addr, char *fmt, int count)
{
        int             c;
        db_expr_t       value;
        int             size;
        int             width;
        char *          fp;

        while (--count >= 0 && !db_pager_quit) {
            fp = fmt;
            size = 4;
            while ((c = *fp++) != 0) {
                switch (c) {
                    case 'b':
                        size = 1;
                        break;
                    case 'h':
                        size = 2;
                        break;
                    case 'l':
                        size = 4;
                        break;
                    case 'g':
                        size = 8;
                        break;
                    case 'a':   /* address */
                        size = sizeof(void *);
                        /* always forces a new line */
                        if (db_print_position() != 0)
                            db_printf("\n");
                        db_prev = addr;
                        db_printsym(addr, DB_STGY_ANY);
                        db_printf(":\t");
                        break;
                    default:
                        if (db_print_position() == 0) {
                            /* Print the address. */
                            db_printsym(addr, DB_STGY_ANY);
                            db_printf(":\t");
                            db_prev = addr;
                        }

                        width = size * 4;
                        switch (c) {
                            case 'r':   /* signed, current radix */
                                value = db_get_value(addr, size, true);
                                addr += size;
                                db_printf("%+-*lr", width, (long)value);
                                break;
                            case 'x':   /* unsigned hex */
                                value = db_get_value(addr, size, false);
                                addr += size;
                                db_printf("%-*lx", width, (long)value);
                                break;
                            case 'z':   /* signed hex */
                                value = db_get_value(addr, size, true);
                                addr += size;
                                db_printf("%-*ly", width, (long)value);
                                break;
                            case 'd':   /* signed decimal */
                                value = db_get_value(addr, size, true);
                                addr += size;
                                db_printf("%-*ld", width, (long)value);
                                break;
                            case 'u':   /* unsigned decimal */
                                value = db_get_value(addr, size, false);
                                addr += size;
                                db_printf("%-*lu", width, (long)value);
                                break;
                            case 'o':   /* unsigned octal */
                                value = db_get_value(addr, size, false);
                                addr += size;
                                db_printf("%-*lo", width, (long)value);
                                break;
                            case 'c':   /* character */
                                value = db_get_value(addr, 1, false);
                                addr += 1;
                                if (value >= ' ' && value <= '~')
                                    db_printf("%c", (int)value);
                                else
                                    db_printf("\\%03o", (int)value);
                                break;
                            case 's':   /* null-terminated string */
                                for (;;) {
                                    value = db_get_value(addr, 1, false);
                                    addr += 1;
                                    if (value == 0)
                                        break;
                                    if (value >= ' ' && value <= '~')
                                        db_printf("%c", (int)value);
                                    else
                                        db_printf("\\%03o", (int)value);
                                }
                                break;
                            case 'S':   /* symbol */
                                value = db_get_value(addr, sizeof(void *),
                                    false);
                                addr += sizeof(void *);
                                db_printsym(value, DB_STGY_ANY);
                                break;
                            case 'i':   /* instruction */
                                addr = db_disasm(addr, false);
                                break;
                            case 'I':   /* instruction, alternate form */
                                addr = db_disasm(addr, true);
                                break;
                            default:
                                break;
                        }
                        if (db_print_position() != 0)
                            db_end_line(1);
                        break;
                }
            }
        }
        db_next = addr;
}

/*
 * Print value.
 */
static char     db_print_format = 'x';

/*ARGSUSED*/
void
db_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
{
        db_expr_t       value;

        if (modif[0] != '\0')
            db_print_format = modif[0];

        switch (db_print_format) {
            case 'a':
                db_printsym((db_addr_t)addr, DB_STGY_ANY);
                break;
            case 'r':
                db_printf("%+11lr", (long)addr);
                break;
            case 'x':
                db_printf("%8lx", (unsigned long)addr);
                break;
            case 'z':
                db_printf("%8ly", (long)addr);
                break;
            case 'd':
                db_printf("%11ld", (long)addr);
                break;
            case 'u':
                db_printf("%11lu", (unsigned long)addr);
                break;
            case 'o':
                db_printf("%16lo", (unsigned long)addr);
                break;
            case 'c':
                value = addr & 0xFF;
                if (value >= ' ' && value <= '~')
                    db_printf("%c", (int)value);
                else
                    db_printf("\\%03o", (int)value);
                break;
            default:
                db_print_format = 'x';
                db_error("Syntax error: unsupported print modifier\n");
                /*NOTREACHED*/
        }
        db_printf("\n");
}

void
db_print_loc_and_inst(db_addr_t loc)
{
        db_expr_t off;

        db_printsym(loc, DB_STGY_PROC);
        if (db_search_symbol(loc, DB_STGY_PROC, &off) != C_DB_SYM_NULL) {
                db_printf(":\t");
                (void)db_disasm(loc, false);
        }
}

/*
 * Search for a value in memory.
 * Syntax: search [/bhl] addr value [mask] [,count]
 */
void
db_search_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
{
        int             t;
        db_addr_t       addr;
        int             size;
        db_expr_t       value;
        db_expr_t       mask;
        db_expr_t       count;

        t = db_read_token();
        if (t == tSLASH) {
            t = db_read_token();
            if (t != tIDENT) {
              bad_modifier:
                db_printf("Bad modifier\n");
                db_flush_lex();
                return;
            }

            if (!strcmp(db_tok_string, "b"))
                size = 1;
            else if (!strcmp(db_tok_string, "h"))
                size = 2;
            else if (!strcmp(db_tok_string, "l"))
                size = 4;
            else
                goto bad_modifier;
        } else {
            db_unread_token(t);
            size = 4;
        }

        if (!db_expression((db_expr_t *)&addr)) {
            db_printf("Address missing\n");
            db_flush_lex();
            return;
        }

        if (!db_expression(&value)) {
            db_printf("Value missing\n");
            db_flush_lex();
            return;
        }

        if (!db_expression(&mask))
            mask = 0xffffffffUL;

        t = db_read_token();
        if (t == tCOMMA) {
            if (!db_expression(&count)) {
                db_printf("Count missing\n");
                db_flush_lex();
                return;
            }
        } else {
            db_unread_token(t);
            count = -1;         /* effectively forever */
        }
        db_skip_to_eol();

        db_search(addr, size, value, mask, count);
}

static void
db_search(db_addr_t addr, int size, db_expr_t value, db_expr_t mask,
    unsigned int count)
{
        while (count-- != 0) {
                db_prev = addr;
                if ((db_get_value(addr, size, false) & mask) == value)
                        break;
                addr += size;
        }
        db_next = addr;
}