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#include <stdio.h>
#include <getopt.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
struct Section {
unsigned short end;
bool invalid;
char * name;
bool banked;
};
typedef struct Section section_t;
// These functions are like strspn and strcspn, but from the right of the string rather than the left.
size_t strrspn(const char *s1, const char *s2) {
const char * _s1 = s1;
const char * _s2;
while (*_s1++);
_s1--;
while (_s1 > s1) {
for (_s2 = s2; *_s2; _s2++) {
if (_s1[-1] == *_s2) {
break;
}
}
if (*_s2 == 0)
break;
_s1--;
}
return _s1 - s1;
}
size_t strrcspn(const char *s1, const char *s2) {
const char * _s1 = s1;
const char * _s2;
while (*_s1++);
_s1--;
while (_s1 > s1) {
for (_s2 = s2; *_s2; _s2++) {
if (_s1[-1] == *_s2)
break;
}
if (*_s2)
break;
_s1--;
}
return _s1 - s1;
}
#define RIP(errmsg) { \
fprintf(stderr, "%s:%d:%s: %s\n", fname, lineno, eline, errmsg); \
if (file) fclose(file); \
return 1; \
}
int main(int argc, char * argv[]) {
int ch;
char line[16*1024];
char eline[16*1024];
char *lineptr = NULL;
char *fname;
int lineno;
section_t section_list[] = {
{0x4000, false, "ROM0", false},
{0x8000, false, "ROMX", true},
{0xA000, false, "VRAM", true},
{0xC000, false, "SRAM", true},
{0xD000, false, "WRAM0", false},
{0xE000, false, "WRAMX", true},
{0xFE00, true, "Echo RAM", false},
{0xFEA0, false, "OAM", false},
{0xFF80, true, "FEXX / IO", false},
{0xFFFF, false, "HRAM", false},
{}
};
while ((ch = getopt(argc, argv, "wdt")) != -1) {
switch (ch) {
case 'w':
case 'd':
section_list[4].end = 0xE000;
break;
case 't':
section_list[0].end = 0x8000;
break;
}
}
for (int arg_idx = optind; arg_idx < argc; arg_idx++) {
int last = -1;
int curr;
eline[0] = 0;
lineno = 0;
fname = argv[arg_idx];
FILE * file = fopen(fname, "r");
if (file == NULL)
RIP("Unable to open file");
while ((lineptr = fgets(line, sizeof(line), file)) != NULL) {
// Assume it's already sorted
lineno++;
unsigned short bank = 0;
unsigned short pointer = 0;
char * symbol = NULL;
char * end;
char * addr_p;
strcpy(eline, line); // Unmodified copy for tracebacks
*strrchr(eline, '\n') = 0;
// line = line.split(";")[0].strip()
lineptr += strspn(lineptr, " \t\n");
end = strchr(lineptr, ';');
if (end) *end = 0;
lineptr[strrspn(lineptr, " \t\n")] = 0;
if (!*line)
continue;
// Get the bank, address, and symbol
end = lineptr + strcspn(lineptr, " \t\n");
symbol = end + strspn(end, " \t\n");
if (!*symbol)
RIP("Declaration not in \"bank:addr Name\" format");
*end = 0;
addr_p = strchr(lineptr, ':');
if (!addr_p)
RIP("Pointer not in bank:addr format");
*addr_p++ = 0;
pointer = strtoul(addr_p, &end, 16);
if (pointer == 0 && end == addr_p)
RIP("Unable to parse symbol address");
bank = strtoul(lineptr, &end, 16);
if (bank == 0 && end == lineptr)
RIP("Unable to parse bank number");
curr = (bank << 14) | (pointer & 0x3fff);
// Main loop
const char * section = NULL;
section_t * section_type;
for (section_type = section_list; section_type->end; section_type++) {
if (pointer < section_type->end) {
if (section_type->invalid) {
fprintf(stderr, "Warning: cannot shim '%s' in section type '%s'\n", symbol, section_type->name);
} else {
section = section_type->name;
if (!section_type->banked)
bank = 0;
}
break;
}
}
if (section == NULL)
// Found section, but cannot shim it
continue;
if (curr != last) {
if (last != -1)
fputc('\n', stdout);
printf("SECTION \"Shim for %s\", %s[$%04X]", symbol, section, pointer);
if (bank)
printf(", BANK[$%04X]", bank);
printf("\n%s::\n", symbol);
last = curr;
} else
printf("%s::\n", symbol);
fflush(stdout);
}
fclose(file);
}
return 0;
}
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