merlin-utils/main.cpp

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2019-12-15 00:01:12 +00:00
#include <string_view>
#include <string>
#include <utility>
#include <cerrno>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cctype>
/* old version of stdlib have this stuff in utility */
#if __has_include(<charconv>)
#define HAVE_CHARCONV
#include <charconv>
#endif
#include <err.h>
#include <sysexits.h>
#include <unistd.h>
#include "link.h"
static void usage(int ex) {
fputs(
"merlin-link [options] infile...\n"
"\noptions:\n"
"-C inhibit SUPER compression\n"
"-D symbol=value define symbol\n"
"-X inhibit expressload segment\n"
"-o outfile specify output file (default gs.out)\n"
"-v be verbose\n"
"\n",
stderr);
exit(ex);
}
/* older std libraries lack charconv and std::from_chars */
static bool parse_number(const char *begin, const char *end, uint32_t &value, int base = 10) {
#if defined(HAVE_CHARCONV)
auto r = std::from_chars(begin, end, value, base);
if (r.ec != std::errc() || r.ptr != end) return false;
#else
auto xerrno = errno;
errno = 0;
char *ptr = nullptr;
value = std::strtoul(begin, &ptr, base);
std::swap(errno, xerrno);
if (xerrno || ptr != end) {
return false;
}
#endif
return true;
}
static void add_define(std::string str) {
/* -D key[=value]
value = 0x, $, % or base 10 */
uint32_t value = 0;
auto ix = str.find('=');
if (ix == 0) usage(EX_USAGE);
if (ix == str.npos) {
value = 1;
} else {
int base = 10;
auto pos = ++ix;
char c = str[pos]; /* returns 0 if == size */
switch(c) {
case '%':
base = 2; ++pos; break;
case '$':
base = 16; ++pos; break;
case '0':
c = str[pos+1];
if (c == 'x' || c == 'X') {
base = 16; pos += 2;
}
break;
}
if (!parse_number(str.data() + pos, str.data() + str.length(), value, base))
usage(EX_USAGE);
str.resize(ix-1);
}
define(str, value, LBL_D);
}
/* .ends_with() is c++20 */
static bool is_S(std::string_view sv) {
size_t s = sv.size();
// && is a sequence point.
return s >= 2 && std::toupper(sv[--s]) == 'S' && sv[--s] == '.';
}
bool verbose = false;
std::string save_file;
bool express = true;
bool compress = true;
int main(int argc, char **argv) {
int c;
bool script = false;
while ((c = getopt(argc, argv, "o:D:XCSv")) != -1) {
switch(c) {
case 'o':
save_file = optarg;
break;
case 'X': express = false; break;
case 'C': compress = false; break;
case 'D': add_define(optarg); break;
case 'v': verbose = true; break;
case 'S': script = true; break;
case ':':
case '?':
default:
usage(EX_USAGE);
break;
}
}
argv += optind;
argc -= optind;
if (!script && !argc) usage(EX_USAGE);
if (script && argc > 1) usage(EX_USAGE);
if (argc == 1 && is_S(*argv)) script = true;
if (script) process_script(argc ? *argv : nullptr);
else process_files(argc, argv);
exit(0);
}