/*
   * (C) Copyright 2003
   * Tait Electronics Limited, Christchurch, New Zealand
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  /*
   * 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;
  
  static const op_tbl_t op_table [] = {
  	{ "-lt", LT },
  	{ "<"  , LT },
  	{ "-gt", GT },
  	{ ">"  , GT },
  	{ "-eq", EQ },
  	{ "==" , EQ },
  	{ "-ne", NE },
  	{ "!=" , NE },
  	{ "<>" , NE },
  	{ "-ge", GE },
  	{ ">=" , GE },
  	{ "-le", LE },
  	{ "<=" , LE },
  };
  
  static long evalexp(char *s, int w)
  {
  	long l = 0;
  	long *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);
  		switch (w) {
  		case 1: return((long)(*(unsigned char *)p));
  		case 2: return((long)(*(unsigned short *)p));
  		case 4: return(*p);
  		}
  	} else {
  		l = simple_strtoul(s, NULL, 16);
  	}
  
  	return l & ((1UL << (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 if (s[0] == '$') {
  		int i = 2;
  
  		if (s[1] != '{')
  			return NULL;
  
  		while (s[i] != '}') {
  			if (s[i] == 0)
  				return NULL;
  			i++;
  		}
  		s[i] = 0;
  		return  getenv((const char *)&s[2]);
  	} else {
  		return s;
  	}
  }
  
  static int stringcomp(char *s, char *t, int op)
  {
  	int p;
  	char *l, *r;
  
  	l = evalstr(s);
  	r = evalstr(t);
  
  	p = strcmp(l, r);
  	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);
  }
  
  static int binary_test(char *op, char *arg1, char *arg2, int w)
  {
  	int len, i;
  	const op_tbl_t *optp;
  
  	len = strlen(op);
  
  	for (optp = (op_tbl_t *)&op_table, i = 0;
  	     i < ARRAY_SIZE(op_table);
  	     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'
  ", op);
  	return 0;	/* op code not found */
  }
  
  /* command line interface to the shell test */
  static int do_itest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  {
  	int	value, w;
  
  	/* Validate arguments */
  	if ((argc != 4))
  		return CMD_RET_USAGE;
  
  	/* 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
  ");
  		value = 0;
  		break;
  	}
  
  	return !value;
  }
  
  U_BOOT_CMD(
  	itest, 4, 0, do_itest,
  	"return true/false on integer compare",
  	"[.b, .w, .l, .s] [*]value1 <op> [*]value2"
  );