/*
 *  nma2n.c by Davide Libenzi (Address to symbol conversion from 'nm' dump)
 *  Copyright (C) 2008  Davide Libenzi
 *
 *  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
 *
 *  Davide Libenzi <davidel@xmailserver.org>
 *
 */

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#define SYMOUT_NO_OFFSET (1 << 0)

static int find_symbol(FILE *nmfp, unsigned long long addr, char *csym, int n,
		       int flags) {
	unsigned long long saddr, caddr;
	char *taddr, *ttype, *tsym;
	char ln[1024];

	rewind(nmfp);
	saddr = 0;
	while (fgets(ln, sizeof(ln), nmfp) != NULL) {
		if (!isxdigit(ln[0]) ||
		    (taddr = strtok(ln, " \t\r\n")) == NULL ||
		    (ttype = strtok(NULL, " \t\r\n")) == NULL ||
		    (tsym = strtok(NULL, "\t\r\n")) == NULL)
			continue;
		caddr = strtoull(taddr, NULL, 16);
		if (caddr <= addr && caddr > saddr) {
			saddr = caddr;
			if (flags & SYMOUT_NO_OFFSET)
				snprintf(csym, n, "%s", tsym);
			else
				snprintf(csym, n, "%s (+ %llu)", tsym, addr - caddr);
		}
	}

	return saddr != 0;
}

static void usage(const char *prg) {
	fprintf(stderr, "use: %s -f NMFILE ADDR [-O] [-d OFFSET] ...\n", prg);
}

int main(int ac, char **av) {
	int i, flags = 0;
	unsigned long long addr;
	long long diff = 0;
	FILE *nmfp;
	const char *nmfile = NULL;
	char csym[512];

	while ((i = getopt(ac, av, "f:d:Oh")) >= 0) {
		switch (i) {
		case 'f':
			nmfile = optarg;
			break;
		case 'd':
			diff = strtoll(optarg, NULL, 16);
			break;
		case 'O':
			flags |= SYMOUT_NO_OFFSET;
			break;
		case '?':
		case 'h':
			usage(av[0]);
			return 1;
		}
	}
	if (nmfile == NULL || optind >= ac) {
		usage(av[0]);
		return 1;
	}
	if ((nmfp = fopen(nmfile, "r")) == NULL) {
		perror(nmfile);
		return 2;
	}
	for (i = optind; i < ac; i++) {
		addr = strtoull(av[i], NULL, 16);
		addr += diff;
		if (find_symbol(nmfp, addr, csym, sizeof(csym), flags))
			fprintf(stdout, "0x%llx\t%s\n", addr, csym);
		else
			fprintf(stdout, "0x%llx\t????\n", addr);
	}
	fclose(nmfp);

	return 0;
}