/* * (C) Copyright 2003 * Tait Electronics Limited, Christchurch, New Zealand * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* * This file provides a shell like 'test' function to return * true/false from an integer or string compare of two memory * locations or a location and a scalar/literal. * A few parts were lifted from bash 'test' command */ #include <common.h> #include <config.h> #include <command.h> #define EQ 0 #define NE 1 #define LT 2 #define GT 3 #define LE 4 #define GE 5 struct op_tbl_s { char *op; /* operator string */ int opcode; /* internal representation of opcode */ }; typedef struct op_tbl_s op_tbl_t; op_tbl_t op_table [] = { { "-lt", LT }, { "<" , LT }, { "-gt", GT }, { ">" , GT }, { "-eq", EQ }, { "==" , EQ }, { "-ne", NE }, { "!=" , NE }, { "<>" , NE }, { "-ge", GE }, { ">=" , GE }, { "-le", LE }, { "<=" , LE }, }; #define op_tbl_size (sizeof(op_table)/sizeof(op_table[0])) static long evalexp(char *s, int w) { long l, *p; /* if the parameter starts with a * then assume is a pointer to the value we want */ if (s[0] == '*') { p = (long *)simple_strtoul(&s[1], NULL, 16); l = *p; } else { l = simple_strtoul(s, NULL, 16); } return (l & ((1 << (w * 8)) - 1)); } static char * evalstr(char *s) { /* if the parameter starts with a * then assume a string pointer else its a literal */ if (s[0] == '*') { return (char *)simple_strtoul(&s[1], NULL, 16); } else { return s; } } static int stringcomp(char *s, char *t, int op) { int n, p; char *l, *r; l = evalstr(s); r = evalstr(t); /* we'll do a compare based on the length of the shortest string */ n = min(strlen(l), strlen(r)); p = strncmp(l, r, n); switch (op) { case EQ: return (p == 0); case NE: return (p != 0); case LT: return (p < 0); case GT: return (p > 0); case LE: return (p <= 0); case GE: return (p >= 0); } return (0); } static int arithcomp (char *s, char *t, int op, int w) { long l, r; l = evalexp (s, w); r = evalexp (t, w); switch (op) { case EQ: return (l == r); case NE: return (l != r); case LT: return (l < r); case GT: return (l > r); case LE: return (l <= r); case GE: return (l >= r); } return (0); } int binary_test (char *op, char *arg1, char *arg2, int w) { int len, i; op_tbl_t *optp; len = strlen(op); for (optp = (op_tbl_t *)&op_table, i = 0; i < op_tbl_size; optp++, i++) { if ((strncmp (op, optp->op, len) == 0) && (len == strlen (optp->op))) { if (w == 0) { return (stringcomp(arg1, arg2, optp->opcode)); } else { return (arithcomp (arg1, arg2, optp->opcode, w)); } } } printf("Unknown operator '%s'\n", op); return 0; /* op code not found */ } /* command line interface to the shell test */ int do_itest ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[] ) { int value, w; /* Validate arguments */ if ((argc != 4)){ printf("Usage:\n%s\n", cmdtp->usage); return 1; } /* Check for a data width specification. * Defaults to long (4) if no specification. * Uses -2 as 'width' for .s (string) so as not to upset existing code */ switch (w = cmd_get_data_size(argv[0], 4)) { case 1: case 2: case 4: value = binary_test (argv[2], argv[1], argv[3], w); break; case -2: value = binary_test (argv[2], argv[1], argv[3], 0); break; case -1: default: puts("Invalid data width specifier\n"); value = 0; break; } return !value; } U_BOOT_CMD( itest, 4, 0, do_itest, "itest\t- return true/false on integer compare\n", "[.b, .w, .l, .s] [*]value1 <op> [*]value2\n" );