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wdenk2d1a5372004-02-23 19:30:57 +00001/*
2 * (C) Copyright 2003
3 * Tait Electronics Limited, Christchurch, New Zealand
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wdenkcd0a9de2004-02-23 20:48:38 +000015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wdenk2d1a5372004-02-23 19:30:57 +000016 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24/*
25 * This file provides a shell like 'test' function to return
26 * true/false from an integer or string compare of two memory
27 * locations or a location and a scalar/literal.
28 * A few parts were lifted from bash 'test' command
29 */
30
31#include <common.h>
32#include <config.h>
33#include <command.h>
34
35#define EQ 0
36#define NE 1
37#define LT 2
38#define GT 3
39#define LE 4
40#define GE 5
41
42struct op_tbl_s {
43 char *op; /* operator string */
44 int opcode; /* internal representation of opcode */
45};
46
47typedef struct op_tbl_s op_tbl_t;
48
49op_tbl_t op_table [] = {
50 { "-lt", LT },
51 { "<" , LT },
52 { "-gt", GT },
53 { ">" , GT },
54 { "-eq", EQ },
55 { "==" , EQ },
56 { "-ne", NE },
57 { "!=" , NE },
58 { "<>" , NE },
59 { "-ge", GE },
60 { ">=" , GE },
61 { "-le", LE },
62 { "<=" , LE },
63};
64
65#define op_tbl_size (sizeof(op_table)/sizeof(op_table[0]))
66
67extern int cmd_get_data_size(char* arg, int default_size);
68
69static long evalexp(char *s, int w)
70{
71 long l, *p;
72
73 /* if the parameter starts with a * then assume is a pointer to the value we want */
74 if (s[0] == '*') {
75 p = (long *)simple_strtoul(&s[1], NULL, 16);
76 l = *p;
77 } else {
78 l = simple_strtoul(s, NULL, 16);
79 }
80
81 return (l & ((1 << (w * 8)) - 1));
82}
83
84static char * evalstr(char *s)
85{
86 /* if the parameter starts with a * then assume a string pointer else its a literal */
87 if (s[0] == '*') {
88 return (char *)simple_strtoul(&s[1], NULL, 16);
89 } else {
90 return s;
91 }
92}
93
94static int stringcomp(char *s, char *t, int op)
95{
96 int n, p;
97 char *l, *r;
98
99 l = evalstr(s);
100 r = evalstr(t);
101
102 /* we'll do a compare based on the length of the shortest string */
103 n = min(strlen(l), strlen(r));
104
105 p = strncmp(l, r, n);
106 switch (op) {
107 case EQ: return (p == 0);
108 case NE: return (p != 0);
109 case LT: return (p < 0);
110 case GT: return (p > 0);
111 case LE: return (p <= 0);
112 case GE: return (p >= 0);
113 }
114 return (0);
115}
116
117static int arithcomp (char *s, char *t, int op, int w)
118{
119 long l, r;
120
121 l = evalexp (s, w);
122 r = evalexp (t, w);
123
124 switch (op) {
125 case EQ: return (l == r);
126 case NE: return (l != r);
127 case LT: return (l < r);
128 case GT: return (l > r);
129 case LE: return (l <= r);
130 case GE: return (l >= r);
131 }
132 return (0);
133}
134
135int binary_test (char *op, char *arg1, char *arg2, int w)
136{
137 int len, i;
138 op_tbl_t *optp;
139
140 len = strlen(op);
141
142 for (optp = (op_tbl_t *)&op_table, i = 0;
143 i < op_tbl_size;
144 optp++, i++) {
145
146 if ((strncmp (op, optp->op, len) == 0) && (len == strlen (optp->op))) {
147 if (w == 0) {
148 return (stringcomp(arg1, arg2, optp->opcode));
149 } else {
150 return (arithcomp (arg1, arg2, optp->opcode, w));
151 }
152 }
153 }
154
155 printf("Unknown operator '%s'\n", op);
156 return 0; /* op code not found */
157}
158
159/* command line interface to the shell test */
160int do_itest ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[] )
161{
wdenkcd0a9de2004-02-23 20:48:38 +0000162 int value, w;
wdenk2d1a5372004-02-23 19:30:57 +0000163
wdenkcd0a9de2004-02-23 20:48:38 +0000164 /* Validate arguments */
165 if ((argc != 4)){
wdenk2d1a5372004-02-23 19:30:57 +0000166 printf("Usage:\n%s\n", cmdtp->usage);
wdenkcd0a9de2004-02-23 20:48:38 +0000167 return 1;
168 }
wdenk2d1a5372004-02-23 19:30:57 +0000169
170 /* Check for a data width specification.
171 * Defaults to long (4) if no specification.
172 * Uses -2 as 'width' for .s (string) so as not to upset existing code
173 */
174 switch (w = cmd_get_data_size(argv[0], 4)) {
175 case 1:
176 case 2:
177 case 4:
178 value = binary_test (argv[2], argv[1], argv[3], w);
179 break;
180 case -2:
181 value = binary_test (argv[2], argv[1], argv[3], 0);
182 break;
183 case -1:
184 default:
185 puts("Invalid data width specifier\n");
186 value = 0;
187 break;
188 }
189
190 return !value;
191}
192
193U_BOOT_CMD(
194 itest, 4, 0, do_itest,
wdenkaa5590b2004-06-09 12:42:26 +0000195 "itest\t- return true/false on integer compare\n",
wdenk2d1a5372004-02-23 19:30:57 +0000196 "[.b, .w, .l, .s] [*]value1 <op> [*]value2\n"
197);