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/* libc.c -- dummy C library simulation
   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
 
This file is part of OpenRISC 1000 Architectural Simulator.
 
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
/* Debugger LIBC functions. Working, but VERY, VERY ugly written.
I wrote following code when basic simulator started to work and I was
desperate to use some printfs in my debugged code. And it was
also used to get some output from Dhrystone MIPS benchmark. */
 
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdarg.h>
 
#include <abstract.h>
#include <arch.h>
 
/* Length of printf format string */
#define FMTLEN 2000
 
char fmtstr[FMTLEN];
 
char *simgetstr(unsigned long stackaddr, unsigned long regparam)
{
	unsigned long fmtaddr;
	FILE *f;
	int i;
 
#if STACK_ARGS
	fmtaddr = eval_mem32(stackaddr);
#else
	fmtaddr = regparam;
#endif
 
	i = 0;
	while (eval_mem8(fmtaddr) != '\0') {
		fmtstr[i++] = eval_mem8(fmtaddr);
		fmtaddr++;
		if (i == FMTLEN - 1)
			break;
	}
	fmtstr[i] = '\0';
 
	return fmtstr;
}
 
void simprintf(unsigned long stackaddr, unsigned long regparam)
{
	unsigned long fmtaddr;
	FILE *f;
	int i = 0;
 
	simgetstr(stackaddr, regparam);
 
	debug("simprintf: stackaddr: 0x%.8lx", stackaddr);
	if ((f = fopen("stdout.txt", "a+"))) {
		unsigned long arg;
		unsigned long argaddr;
		unsigned char regstr[5];
		char *fmtstrend;
		char *fmtstrpart = fmtstr;
 
#if STACK_ARGS
		argaddr = stackaddr;
#else
		argaddr = 3;
#endif
		debug("simprintf: %s", fmtstrpart);
		while(strlen(fmtstrpart)) {
			debug("simprintf(): 1");
			if ((fmtstrend = strstr(fmtstrpart + 1, "%")))
				*fmtstrend = '\0';
			debug(" 2");
			if (strstr(fmtstrpart, "%")) {
				debug(" 3");
#if STACK_ARGS
				argaddr += 4;
				arg = eval_mem32(argaddr);
#else
				sprintf(regstr, "r%u", ++argaddr);
				arg = eval_reg(regstr);
#endif
				debug(" 4: fmtstrpart=%p fmtstrpart=%s arg=%p", fmtstrpart, fmtstrpart, arg);
				if (strncmp(fmtstrpart, "%s", 2) == 0) {
					int len = 0;
					char *str;
					for(; eval_mem8(arg++); len++);
					len++;	/* for null char */
					arg -= len;
					str = (char *)malloc(len);
					len = 0;
					for(; eval_mem8(arg); len++)
						*(str+len) = eval_mem8(arg++);
					*(str+len) = eval_mem8(arg); /* null ch */
					/* debug("4a: len=%d str=%s\n", len, str);
					debug("4b:"); */
					fprintf(f, fmtstrpart, str);
					free(str);
				} else
					fprintf(f, fmtstrpart, arg);
			} else {
				debug(" 5");
				fprintf(f, fmtstrpart);
				debug(fmtstrpart);
			}
			if (!fmtstrend)
				break;
			debug(" 6");
			fmtstrpart = fmtstrend;
			*fmtstrpart = '%';
			debug(" 7");
		}
 
		debug(" 8");
		if (fclose(f))
			perror(strerror(errno));
	}
	else
		perror(strerror(errno));
 
}