3 * Tait Electronics Limited, Christchurch, New Zealand
5 * SPDX-License-Identifier: GPL-2.0+
9 * This file provides a shell like 'test' function to return
10 * true/false from an integer or string compare of two memory
11 * locations or a location and a scalar/literal.
12 * A few parts were lifted from bash 'test' command
30 char *op; /* operator string */
31 int opcode; /* internal representation of opcode */
34 typedef struct op_tbl_s op_tbl_t;
36 static const op_tbl_t op_table [] = {
52 static long evalexp(char *s, int w)
58 /* if the parameter starts with a * then assume is a pointer to the value we want */
60 addr = simple_strtoul(&s[1], NULL, 16);
61 buf = map_physmem(addr, w, MAP_WRBACK);
63 puts("Failed to map physical memory\n");
68 l = (long)(*(unsigned char *)buf);
71 l = (long)(*(unsigned short *)buf);
74 l = (long)(*(unsigned long *)buf);
77 unmap_physmem(buf, w);
80 l = simple_strtoul(s, NULL, 16);
83 return l & ((1UL << (w * 8)) - 1);
86 static char * evalstr(char *s)
88 /* if the parameter starts with a * then assume a string pointer else its a literal */
90 return (char *)simple_strtoul(&s[1], NULL, 16);
91 } else if (s[0] == '$') {
103 return getenv((const char *)&s[2]);
109 static int stringcomp(char *s, char *t, int op)
119 case EQ: return (p == 0);
120 case NE: return (p != 0);
121 case LT: return (p < 0);
122 case GT: return (p > 0);
123 case LE: return (p <= 0);
124 case GE: return (p >= 0);
129 static int arithcomp (char *s, char *t, int op, int w)
137 case EQ: return (l == r);
138 case NE: return (l != r);
139 case LT: return (l < r);
140 case GT: return (l > r);
141 case LE: return (l <= r);
142 case GE: return (l >= r);
147 static int binary_test(char *op, char *arg1, char *arg2, int w)
150 const op_tbl_t *optp;
154 for (optp = (op_tbl_t *)&op_table, i = 0;
155 i < ARRAY_SIZE(op_table);
158 if ((strncmp (op, optp->op, len) == 0) && (len == strlen (optp->op))) {
160 return (stringcomp(arg1, arg2, optp->opcode));
162 return (arithcomp (arg1, arg2, optp->opcode, w));
167 printf("Unknown operator '%s'\n", op);
168 return 0; /* op code not found */
171 /* command line interface to the shell test */
172 static int do_itest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
176 /* Validate arguments */
178 return CMD_RET_USAGE;
180 /* Check for a data width specification.
181 * Defaults to long (4) if no specification.
182 * Uses -2 as 'width' for .s (string) so as not to upset existing code
184 switch (w = cmd_get_data_size(argv[0], 4)) {
188 value = binary_test (argv[2], argv[1], argv[3], w);
191 value = binary_test (argv[2], argv[1], argv[3], 0);
195 puts("Invalid data width specifier\n");
204 itest, 4, 0, do_itest,
205 "return true/false on integer compare",
206 "[.b, .w, .l, .s] [*]value1 <op> [*]value2"