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// rand.c, version 1.0.1 |
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// OMKOV coreutils rand |
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// Copyright (C) 2020, Jakob Wakeling |
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// MIT Licence |
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#include "util/error.h" |
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#include "util/optget.h" |
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#include <stdint.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#define VERSION "1.0.1" |
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#define aSIZE (sizeof (aset) - 1) |
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#define ASIZE (sizeof (Aset) - 1) |
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#define nSIZE (sizeof (nset) - 1) |
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#define sSIZE (sizeof (sset) - 1) |
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static struct lop lops[] = { |
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{ "help", ARG_NUL, 256 }, |
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{ "version", ARG_NUL, 257 }, |
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{ NULL, 0, 0 } |
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}; |
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static const char aset[] = "abcdefghijklmnopqrstuvwxyz"; |
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static const char Aset[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
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static const char nset[] = "0123456789"; |
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static const char sset[] = "!@#$%^&*"; |
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static int mode; |
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static uintmax_t len; |
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static void hlp(void); |
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static void ver(void); |
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int main(int ac, char *av[]) { A0 = av[0]; |
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struct opt opt = OPTGET_INIT; opt.str = "aAns"; opt.lops = lops; |
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for (int o; (o = optget(&opt, av, 1)) != -1;) switch (o) { |
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case 'a': { mode |= 1; break; } |
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case 'A': { mode |= 2; break; } |
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case 'n': { mode |= 4; break; } |
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case 's': { mode |= 8; break; } |
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case 256: { hlp(); return 0; } |
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case 257: { ver(); return 0; } |
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default: { return 1; } |
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} |
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if (!mode) { mode = 6; } |
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if (opt.ind == ac) { len = 8; } |
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else { |
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register uintmax_t d; register char *p = av[opt.ind]; |
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for (; *p >= '0' && *p <= '9'; ++p) { |
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d = (uintmax_t)*p - '0'; |
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if (len > (UINTMAX_MAX - d) / 10) { break; } |
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len = len * 10 + d; |
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} |
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if (*p) { error(1, "%s: invalid length", av[opt.ind]); } |
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} |
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FILE *rand; char *set; unsigned setlen = 0, n; |
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if (!(rand = fopen("/dev/urandom", "r"))) { |
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error(1, "%s: %s", "/dev/urandom", serr()); |
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} |
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if (mode & 1) { setlen += aSIZE; } |
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if (mode & 2) { setlen += ASIZE; } |
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if (mode & 4) { setlen += nSIZE; } |
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if (mode & 8) { setlen += sSIZE; } |
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if (!(set = (char *)malloc(setlen + 1))) { |
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fclose(rand); error(1, "%s", serr()); |
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} |
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if (mode & 1) { strcat(set, aset); } |
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if (mode & 2) { strcat(set, Aset); } |
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if (mode & 4) { strcat(set, nset); } |
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if (mode & 8) { strcat(set, sset); } |
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for (uintmax_t i = 0; i < len; ++i) { |
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fread(&n, sizeof (unsigned long), 1, rand); n %= setlen; |
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fputc(set[n], stdout); |
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} fputc('\n', stdout); |
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fclose(rand); free(set); return 0; |
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} |
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static void hlp(void) { |
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puts("rand - generate random string\n"); |
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puts("usage: rand [-aAns] [length]\n"); |
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puts("options:"); |
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puts(" -a Enable lowercase letters in the string output"); |
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puts(" -A Enable uppercase letters in the string output"); |
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puts(" -n Enable numbers in the string output"); |
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puts(" -s Enable symbols '!@#$%^&*' in the string output"); |
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puts(" --help Display help information"); |
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puts(" --version Display version information"); |
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} |
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static void ver(void) { |
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puts("OMKOV coreutils rand, version " VERSION); |
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puts("Copyright (C) 2020, Jakob Wakeling"); |
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puts("MIT Licence (https://opensource.org/licenses/MIT)"); |
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} |
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