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/* yForth? - A Forth interpreter written in ANSI C
* Copyright (C) 2012 Luca Padovani
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
* ------------------------------------------------------------------------
* Module name: yforth.c
* Abstract: Main program
*/
#include <setjmp.h>
#include <stdio.h>
#include <stdlib.h>
#include "yforth.h"
#include "defaults.h"
#include "core.h"
#include "block.h"
#include "search.h"
#include "ver.h"
#include "file.h"
jmp_buf warm_start_jump, cold_start_jump;
Char *dp0; /* Data-Space base pointer */
Cell dspace_size = DEF_DSPACE_SIZE; /* Data-Space size */
Cell dstack_size = DEF_DSTACK_SIZE, /* Data-Stack size */
rstack_size = DEF_RSTACK_SIZE, /* Return-stack size */
fstack_size = DEF_FSTACK_SIZE; /* Floating-stack size */
Cell tib_size = DEF_TIB_SIZE; /* TIB size */
Cell in_pnos, pnos_size; /* Pictured Numeric Output String */
Char *pnos, *p_pnos; /* Ptrs inside PNOS */
Cell pad_size = DEF_PAD_SIZE; /* PAD size */
static char *file_name, /* Ptr to file name on command line, if present */
*image_file; /* Ptr to image file name on cmd line, if present */
static int silent,
image_file_loaded;
static struct image_header hd;
void print_version() {
printf("yForth? v%d.%d%s Copyright (C) 2012 Luca Padovani\n\
This program comes with ABSOLUTELY NO WARRANTY.\n\
This is free software, and you are welcome to redistribute it\n\
under certain conditions; see LICENSE for details.\n",
VER_HI, VER_LO, VER_TEST);
}
void print_help(void) {
print_version();
printf("Usage: yForth [options] [file name]\n\
-d<n> Data-Space size -s<n> Data-Stack size\n\
-r<n> Return-Stack size -f<n> Floating-Stack size\n\
-t<n> TIB size -p<n> PAD size\n\
-h,-H This help -q Quiet\n\
-i<file> Image file\n\
All sizes are expressed in cells.\n");
}
/* do_parameters: processes parameters passed on command line */
void do_parameters(int argc, char *argv[]) {
int i = 1;
while (argc-- > 1) {
if (argv[i][0] == '-')
switch (argv[i][1]) {
case 'd': dspace_size = atoi(argv[i] + 2); break;
case 's': dstack_size = atoi(argv[i] + 2); break;
case 'r': rstack_size = atoi(argv[i] + 2); break;
case 'f': fstack_size = atoi(argv[i] + 2); break;
case 't': tib_size = atoi(argv[i] + 2); break;
case 'p': pad_size = atoi(argv[i] + 2); break;
case 'q': silent = 1; break;
case 'i': image_file = argv[i] + 2; break;
case 'h':
case 'H':
print_help();
exit(0);
break;
default:
fprintf(stderr, "%c unknown option, use -h for help.\n");
exit(0);
break;
}
else {
file_name = argv[i];
break;
}
}
}
/* default_parameters: adjust environment parameters in case they do not
* fall into required range
*/
void default_parameters(void) {
dspace_size = max(MIN_DSPACE_SIZE, dspace_size);
dstack_size = max(MIN_DSTACK_SIZE, dstack_size);
rstack_size = max(MIN_RSTACK_SIZE, rstack_size);
fstack_size = max(MIN_FSTACK_SIZE, fstack_size);
tib_size = max(MIN_TIB_SIZE, tib_size);
pad_size = max(MIN_PAD_SIZE, pad_size);
}
/* load_image_file: loads image file named "name" into the dictionary. Loading
* is divided in two parts: when "header" is set to 1 the file is opened and
* the header is loaded into the structure "hd". Then some checks are made
* to adjust parameters in case of a corrupted image.
* Finally, when "load_image_file" is called with "header" set to 0, the
* actual loading is performed. Note that pointers inside the dictionary
* are absolute, so an image file can be loaded only if the allocated
* memory is placed at the same address when it's been saved. Furthermore,
* the same image file cannot be loaded thru different version of the
* executable file "yForth".
*/
int load_image_file(char *name, int header) {
FILE *f = fopen(name, "rb");
int res = 1;
if (f) {
if (header) {
if (fread(&hd, sizeof(struct image_header), 1, f)) {
if (hd.ver_hi != VER_HI || hd.ver_lo != VER_LO)
if (!silent)
fprintf(stderr, "Warning: different image file version (%d.%d).\n",
hd.ver_hi, hd.ver_lo);
if (hd.pattern != VERSION_PATTERN)
if (!silent)
fprintf(stderr, "Warning: different version pattern (Image: %x).\n",
hd.pattern);
res = 0;
} else fprintf(stderr, "Error: can't read image file header.\n");
} else {
fseek(f, sizeof(struct image_header), SEEK_SET);
if (hd.base == dp0) {
struct voc_marker vm;
if (fread(&vm, sizeof(struct voc_marker), 1, f) < 1 ||
fread(dp0, sizeof(Cell), hd.dspace_size, f) != hd.dspace_size)
fprintf(stderr, "Error: can't read image file.\n");
else {
load_vocabulary(&vm);
res = 0;
}
} else fprintf(stderr, "Error: can't load image file with base %u at %u.\n",
hd.base, dp0);
}
fclose(f);
} else fprintf(stderr, "Can't open image file (%s).\n", name);
return (res);
}
main(int argc, char *argv[]) {
do_parameters(argc, argv);
if (image_file) {
if (load_image_file(image_file, 1)) exit(-1);
} else fopen(argv[0], "rb");
/* !!! WARNING !!! Previous line opens a file even if no image-file
* is specified. This is because in some system data space would
* result unaligned in subsequent loadings. I have to find a more
* smart trick here...
*/
default_parameters();
#if BLOCK_DEF
open_block_file("YFORTH.BLK");
#endif
init_stacks(dstack_size, rstack_size, fstack_size);
if (image_file && dspace_size < hd.dspace_size) {
if (!silent)
fprintf(stderr, "Warning: can't restrict dictionary to %u cells, now is %u cells.\n",
dspace_size, hd.dspace_size);
dspace_size = max(dspace_size, hd.dspace_size);
}
init_data_space(dspace_size);
init_tib(tib_size);
init_pad(pad_size);
init_pnos();
init_signals();
silent |= setjmp(cold_start_jump);
if (image_file)
if (load_image_file(image_file, 0)) exit(-1);
/* Note that after a cold start the vocabulary is reloaded */
if (!silent) {
print_version();
/*
printf("Cell: %d Double-Cell: %d Char: %d Real: %d\n",
sizeof(Cell), sizeof(DCell), sizeof(Char), sizeof(Real));
*/
}
init_forth_environment(!image_file);
if (!setjmp(warm_start_jump) && file_name) load_file(file_name);
_quit();
return 0;
}
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