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