/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "leaky.h"

#ifdef USE_COFF

#define	LANGUAGE_C
#include <sym.h>
#include <cmplrs/stsupport.h>
#include <symconst.h>
#include <filehdr.h>
#include <ldfcn.h>
#include <string.h>
#include <stdlib.h>

#ifdef IRIX4
extern "C" {
    extern char *demangle(char const* in);
};
#else
#include <dem.h>
#endif

static char *Demangle(char *rawName)
{
#ifdef IRIX4
    return strdup(demangle(rawName));
#else
    char namebuf[4000];
    demangle(rawName, namebuf);
    return strdup(namebuf);
#endif
}

void leaky::readSymbols(const char *fileName)
{
    LDFILE *ldptr;

    ldptr = ldopen(fileName, nullptr);
    if (!ldptr) {
	fprintf(stderr, "%s: unable to open \"%s\"\n", applicationName,
		fileName);
	exit(-1);
    }
    if (PSYMTAB(ldptr) == 0) {
	fprintf(stderr, "%s: \"%s\": has no symbol table\n", applicationName,
		fileName);
	exit(-1);
    }

    long isymMax = SYMHEADER(ldptr).isymMax;
    long iextMax = SYMHEADER(ldptr).iextMax;
    long iMax = isymMax + iextMax;

    long alloced = 10000;
    Symbol* syms = (Symbol*) malloc(sizeof(Symbol) * 10000);
    Symbol* sp = syms;
    Symbol* last = syms + alloced;
    SYMR symr;

    for (long isym = 0; isym < iMax; isym++) {
	if (ldtbread(ldptr, isym, &symr) != SUCCESS) {
	    fprintf(stderr, "%s: can't read symbol #%d\n", applicationName,
		    isym);
	    exit(-1);
	}
	if (isym < isymMax) {
	    if ((symr.st == stStaticProc)
		|| ((symr.st == stProc) &&
		    ((symr.sc == scText) || (symr.sc == scAbs)))
		|| ((symr.st == stBlock) &&
		    (symr.sc == scText))) {
		// Text symbol. Set name field to point to the symbol name
		sp->name = Demangle(ldgetname(ldptr, &symr));
		sp->address = symr.value;
		sp++;
		if (sp >= last) {
		    long n = alloced + 10000;
		    syms = (Symbol*)
			realloc(syms, (size_t) (sizeof(Symbol) * n));
		    last = syms + n;
		    sp = syms + alloced;
		    alloced = n;
		}
	    }
	}
    }

    int interesting = sp - syms;
    if (!quiet) {
	printf("Total of %d symbols\n", interesting);
    }
    usefulSymbols = interesting;
    externalSymbols = syms;
}

#endif /* USE_COFF */