auxlily.c

   1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
   2  *@ Auxiliary functions that don't fit anywhere else.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 - 2017 Steffen (Daode) Nurpmeso <steffen@sdaoden.eu>.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35 #undef n_FILE
  36 #define n_FILE auxlily
  37
  38 #ifndef HAVE_AMALGAMATION
  39 # include "nail.h"
  40 #endif
  41
  42 #include <sys/utsname.h>
  43
  44 #ifdef HAVE_GETRANDOM
  45 # include HAVE_GETRANDOM_HEADER
  46 #endif
  47
  48 #ifdef HAVE_SOCKETS
  49 # ifdef HAVE_GETADDRINFO
  50 #  include <sys/socket.h>
  51 # endif
  52
  53 # include <netdb.h>
  54 #endif
  55
  56 #ifndef HAVE_POSIX_RANDOM
  57 union rand_state{
  58    struct rand_arc4{
  59       ui8_t _dat[256];
  60       ui8_t _i;
  61       ui8_t _j;
  62       ui8_t __pad[6];
  63    } a;
  64    ui8_t b8[sizeof(struct rand_arc4)];
  65    ui32_t b32[sizeof(struct rand_arc4) / sizeof(ui32_t)];
  66 };
  67 #endif
  68
  69 #ifdef HAVE_ERRORS
  70 struct a_aux_err_node{
  71    struct a_aux_err_node *ae_next;
  72    struct n_string ae_str;
  73 };
  74 #endif
  75
  76 static ui8_t a_aux_idec_atoi[256] = {
  77    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  78    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  79    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  80    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  81    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,0x01,
  82    0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0xFF,0xFF,
  83    0xFF,0xFF,0xFF,0xFF,0xFF,0x0A,0x0B,0x0C,0x0D,0x0E,
  84    0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,
  85    0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,0x21,0x22,
  86    0x23,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x0A,0x0B,0x0C,
  87    0x0D,0x0E,0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16,
  88    0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20,
  89    0x21,0x22,0x23,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  90    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  91    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  92    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  93    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  94    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  95    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  96    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  97    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  98    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
  99    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 100    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 101    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
 102    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF
 103 };
 104
 105 #define a_X(X) ((ui64_t)-1 / (X))
 106 static ui64_t const a_aux_idec_cutlimit[35] = {
 107    a_X( 2), a_X( 3), a_X( 4), a_X( 5), a_X( 6), a_X( 7), a_X( 8),
 108    a_X( 9), a_X(10), a_X(11), a_X(12), a_X(13), a_X(14), a_X(15),
 109    a_X(16), a_X(17), a_X(18), a_X(19), a_X(20), a_X(21), a_X(22),
 110    a_X(23), a_X(24), a_X(25), a_X(26), a_X(27), a_X(28), a_X(29),
 111    a_X(30), a_X(31), a_X(32), a_X(33), a_X(34), a_X(35), a_X(36)
 112 };
 113 #undef a_X
 114
 115 #ifndef HAVE_POSIX_RANDOM
 116 static union rand_state *a_aux_rand;
 117 #endif
 118
 119 /* Error ring, for `errors' */
 120 #ifdef HAVE_ERRORS
 121 static struct a_aux_err_node *a_aux_err_head, *a_aux_err_tail;
 122 static size_t a_aux_err_cnt, a_aux_err_cnt_noted;
 123 #endif
 124 static size_t a_aux_err_linelen;
 125
 126 /* Our ARC4 random generator with its completely unacademical pseudo
 127  * initialization (shall /dev/urandom fail) */
 128 #ifndef HAVE_POSIX_RANDOM
 129 static void a_aux_rand_init(void);
 130 SINLINE ui8_t a_aux_rand_get8(void);
 131 # ifndef HAVE_GETRANDOM
 132 static ui32_t a_aux_rand_weak(ui32_t seed);
 133 # endif
 134 #endif
 135
 136 #ifndef HAVE_POSIX_RANDOM
 137 static void
 138 a_aux_rand_init(void){
 139 # ifndef HAVE_GETRANDOM
 140 #  ifdef HAVE_CLOCK_GETTIME
 141    struct timespec ts;
 142 #  else
 143    struct timeval ts;
 144 #  endif
 145    union {int fd; size_t i;} u;
 146    ui32_t seed, rnd;
 147 # endif
 148    NYD2_ENTER;
 149
 150    a_aux_rand = smalloc(sizeof *a_aux_rand);
 151
 152 # ifdef HAVE_GETRANDOM
 153    /* getrandom(2) guarantees 256 without EINTR.. */
 154    n_LCTA(sizeof(a_aux_rand->a._dat) <= 256,
 155       "Buffer to large to be served without EINTR error");
 156    for(;;){
 157       ssize_t gr;
 158
 159       gr = HAVE_GETRANDOM(a_aux_rand->a._dat, sizeof a_aux_rand->a._dat);
 160       a_aux_rand->a._i = a_aux_rand->a._dat[42];
 161       a_aux_rand->a._j = a_aux_rand->a._dat[84];
 162       /* ..but be on the safe side */
 163       if(UICMP(z, gr, ==, sizeof(a_aux_rand->a._dat)))
 164          break;
 165       n_msleep(250, FAL0);
 166    }
 167
 168 # else
 169    if((u.fd = open("/dev/urandom", O_RDONLY)) != -1){
 170       bool_t ok;
 171
 172       ok = (sizeof(a_aux_rand->a._dat) == (size_t)read(u.fd, a_aux_rand->a._dat,
 173             sizeof(a_aux_rand->a._dat)));
 174       close(u.fd);
 175
 176       a_aux_rand->a._i = a_aux_rand->a._dat[42];
 177       a_aux_rand->a._j = a_aux_rand->a._dat[84];
 178       if(ok)
 179          goto jleave;
 180    }
 181
 182    for(seed = (uintptr_t)a_aux_rand & UI32_MAX, rnd = 21; rnd != 0; --rnd){
 183       for(u.i = n_NELEM(a_aux_rand->b32); u.i-- != 0;){
 184          ui32_t t, k;
 185
 186 #  ifdef HAVE_CLOCK_GETTIME
 187          clock_gettime(CLOCK_REALTIME, &ts);
 188          t = (ui32_t)ts.tv_nsec;
 189 #  else
 190          gettimeofday(&ts, NULL);
 191          t = (ui32_t)ts.tv_usec;
 192 #  endif
 193          if(rnd & 1)
 194             t = (t >> 16) | (t << 16);
 195          a_aux_rand->b32[u.i] ^= a_aux_rand_weak(seed ^ t);
 196          a_aux_rand->b32[t % n_NELEM(a_aux_rand->b32)] ^= seed;
 197          if(rnd == 7 || rnd == 17)
 198             a_aux_rand->b32[u.i] ^= a_aux_rand_weak(seed ^ (ui32_t)ts.tv_sec);
 199          k = a_aux_rand->b32[u.i] % n_NELEM(a_aux_rand->b32);
 200          a_aux_rand->b32[k] ^= a_aux_rand->b32[u.i];
 201          seed ^= a_aux_rand_weak(a_aux_rand->b32[k]);
 202          if((rnd & 3) == 3)
 203             seed ^= nextprime(seed);
 204       }
 205    }
 206
 207    for(u.i = 5 * sizeof(a_aux_rand->b8); u.i != 0; --u.i)
 208       a_aux_rand_get8();
 209 jleave:
 210 # endif /* !HAVE_GETRANDOM */
 211    NYD2_LEAVE;
 212 }
 213
 214 SINLINE ui8_t
 215 a_aux_rand_get8(void){
 216    ui8_t si, sj;
 217
 218    si = a_aux_rand->a._dat[++a_aux_rand->a._i];
 219    sj = a_aux_rand->a._dat[a_aux_rand->a._j += si];
 220    a_aux_rand->a._dat[a_aux_rand->a._i] = sj;
 221    a_aux_rand->a._dat[a_aux_rand->a._j] = si;
 222    return a_aux_rand->a._dat[(ui8_t)(si + sj)];
 223 }
 224
 225 # ifndef HAVE_GETRANDOM
 226 static ui32_t
 227 a_aux_rand_weak(ui32_t seed){
 228    /* From "Random number generators: good ones are hard to find",
 229     * Park and Miller, Communications of the ACM, vol. 31, no. 10,
 230     * October 1988, p. 1195.
 231     * (In fact: FreeBSD 4.7, /usr/src/lib/libc/stdlib/random.c.) */
 232    ui32_t hi;
 233
 234    if(seed == 0)
 235       seed = 123459876;
 236    hi =  seed /  127773;
 237          seed %= 127773;
 238    seed = (seed * 16807) - (hi * 2836);
 239    if((si32_t)seed < 0)
 240       seed += SI32_MAX;
 241    return seed;
 242 }
 243 # endif /* HAVE_GETRANDOM */
 244 #endif /* !HAVE_POSIX_RANDOM */
 245
 246 FL size_t
 247 n_screensize(void){
 248    char const *cp;
 249    uiz_t rv;
 250    NYD2_ENTER;
 251
 252    if((cp = ok_vlook(screen)) != NULL){
 253       n_idec_uiz_cp(&rv, cp, 0, NULL);
 254       if(rv == 0)
 255          rv = n_scrnheight;
 256    }else
 257       rv = n_scrnheight;
 258
 259    if(rv > 2)
 260       rv -= 2;
 261    NYD2_LEAVE;
 262    return rv;
 263 }
 264
 265 FL char const *
 266 n_pager_get(char const **env_addon){
 267    char const *rv;
 268    NYD_ENTER;
 269
 270    rv = ok_vlook(PAGER);
 271
 272    if(env_addon != NULL){
 273       *env_addon = NULL;
 274       /* Update the manual upon any changes:
 275        *    *colour-pager*, $PAGER */
 276       if(strstr(rv, "less") != NULL){
 277          if(getenv("LESS") == NULL)
 278             *env_addon =
 279 #ifdef HAVE_TERMCAP
 280                   (n_psonce & n_PSO_TERMCAP_CA_MODE) ? "LESS=Ri"
 281                      : !(n_psonce & n_PSO_TERMCAP_DISABLE) ? "LESS=FRi" :
 282 #endif
 283                         "LESS=FRXi";
 284       }else if(strstr(rv, "lv") != NULL){
 285          if(getenv("LV") == NULL)
 286             *env_addon = "LV=-c";
 287       }
 288    }
 289    NYD_LEAVE;
 290    return rv;
 291 }
 292
 293 FL void
 294 page_or_print(FILE *fp, size_t lines)
 295 {
 296    int c;
 297    char const *cp;
 298    NYD_ENTER;
 299
 300    fflush_rewind(fp);
 301
 302    if (n_source_may_yield_control() && (cp = ok_vlook(crt)) != NULL) {
 303       size_t rows;
 304
 305       if(*cp == '\0')
 306          rows = (size_t)n_scrnheight;
 307       else
 308          n_idec_uiz_cp(&rows, cp, 0, NULL);
 309
 310       if (rows > 0 && lines == 0) {
 311          while ((c = getc(fp)) != EOF)
 312             if (c == '\n' && ++lines >= rows)
 313                break;
 314          really_rewind(fp);
 315       }
 316
 317       if (lines >= rows) {
 318          char const *env_add[2], *pager;
 319
 320          pager = n_pager_get(&env_add[0]);
 321          env_add[1] = NULL;
 322          run_command(pager, NULL, fileno(fp), COMMAND_FD_PASS, NULL,NULL,NULL,
 323             env_add);
 324          goto jleave;
 325       }
 326    }
 327
 328    while ((c = getc(fp)) != EOF)
 329       putc(c, n_stdout);
 330 jleave:
 331    NYD_LEAVE;
 332 }
 333
 334 FL enum protocol
 335 which_protocol(char const *name) /* XXX (->URL (yet auxlily.c)) */
 336 {
 337    struct stat st;
 338    char const *cp;
 339    char *np;
 340    size_t sz;
 341    enum protocol rv = PROTO_UNKNOWN;
 342    NYD_ENTER;
 343
 344    temporary_protocol_ext = NULL;
 345
 346    if (name[0] == '%' && name[1] == ':')
 347       name += 2;
 348    for (cp = name; *cp && *cp != ':'; cp++)
 349       if (!alnumchar(*cp))
 350          goto jfile;
 351
 352    if (cp[0] == ':' && cp[1] == '/' && cp[2] == '/') {
 353       if (!strncmp(name, "pop3://", 7)) {
 354 #ifdef HAVE_POP3
 355          rv = PROTO_POP3;
 356 #else
 357          n_err(_("No POP3 support compiled in\n"));
 358 #endif
 359       } else if (!strncmp(name, "pop3s://", 8)) {
 360 #if defined HAVE_POP3 && defined HAVE_SSL
 361          rv = PROTO_POP3;
 362 #else
 363 # ifndef HAVE_POP3
 364          n_err(_("No POP3 support compiled in\n"));
 365 # endif
 366 # ifndef HAVE_SSL
 367          n_err(_("No SSL support compiled in\n"));
 368 # endif
 369 #endif
 370       }
 371       goto jleave;
 372    }
 373
 374    /* TODO This is the de facto maildir code and thus belongs into there!
 375     * TODO and: we should have maildir:// and mbox:// pseudo-protos, instead of
 376     * TODO or (more likely) in addition to *newfolders*) */
 377 jfile:
 378    rv = PROTO_FILE;
 379    np = ac_alloc((sz = strlen(name)) + 4 +1);
 380    memcpy(np, name, sz + 1);
 381    if (!stat(name, &st)) {
 382       if (S_ISDIR(st.st_mode) &&
 383             (memcpy(np+sz, "/tmp", 5), !stat(np, &st) && S_ISDIR(st.st_mode)) &&
 384             (memcpy(np+sz, "/new", 5), !stat(np, &st) && S_ISDIR(st.st_mode)) &&
 385             (memcpy(np+sz, "/cur", 5), !stat(np, &st) && S_ISDIR(st.st_mode)))
 386           rv = PROTO_MAILDIR;
 387    } else {
 388       if ((memcpy(np+sz, cp=".gz", 4), !stat(np, &st) && S_ISREG(st.st_mode)) ||
 389             (memcpy(np+sz, cp=".xz",4), !stat(np,&st) && S_ISREG(st.st_mode)) ||
 390             (memcpy(np+sz, cp=".bz2",5), !stat(np, &st) && S_ISREG(st.st_mode)))
 391          temporary_protocol_ext = cp;
 392       else if ((cp = ok_vlook(newfolders)) != NULL &&
 393             !asccasecmp(cp, "maildir"))
 394          rv = PROTO_MAILDIR;
 395    }
 396    ac_free(np);
 397 jleave:
 398    NYD_LEAVE;
 399    return rv;
 400 }
 401
 402 FL char *
 403 n_c_to_hex_base16(char store[3], char c){
 404    static char const itoa16[] = "0123456789ABCDEF";
 405    NYD2_ENTER;
 406
 407    store[2] = '\0';
 408    store[1] = itoa16[(ui8_t)c & 0x0F];
 409    c = ((ui8_t)c >> 4) & 0x0F;
 410    store[0] = itoa16[(ui8_t)c];
 411    NYD2_LEAVE;
 412    return store;
 413 }
 414
 415 FL si32_t
 416 n_c_from_hex_base16(char const hex[2]){
 417    static ui8_t const atoi16[] = {
 418       0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x30-0x37 */
 419       0x08, 0x09, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x38-0x3F */
 420       0xFF, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0xFF, /* 0x40-0x47 */
 421       0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x48-0x4f */
 422       0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x50-0x57 */
 423       0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, /* 0x58-0x5f */
 424       0xFF, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0xFF  /* 0x60-0x67 */
 425    };
 426    ui8_t i1, i2;
 427    si32_t rv;
 428    NYD2_ENTER;
 429
 430    if ((i1 = (ui8_t)hex[0] - '0') >= n_NELEM(atoi16) ||
 431          (i2 = (ui8_t)hex[1] - '0') >= n_NELEM(atoi16))
 432       goto jerr;
 433    i1 = atoi16[i1];
 434    i2 = atoi16[i2];
 435    if ((i1 | i2) & 0xF0u)
 436       goto jerr;
 437    rv = i1;
 438    rv <<= 4;
 439    rv += i2;
 440 jleave:
 441    NYD2_LEAVE;
 442    return rv;
 443 jerr:
 444    rv = -1;
 445    goto jleave;
 446 }
 447
 448 FL enum n_idec_state
 449 n_idec_buf(void *resp, char const *cbuf, uiz_t clen, ui8_t base,
 450       enum n_idec_mode idm, char const **endptr_or_null){
 451    /* XXX Brute simple and */
 452    ui8_t currc;
 453    ui64_t res, cut;
 454    enum n_idec_state rv;
 455    NYD_ENTER;
 456
 457    idm &= n__IDEC_MODE_MASK;
 458    rv = n_IDEC_STATE_NONE | idm;
 459    res = 0;
 460
 461    if(clen == UIZ_MAX){
 462       if(*cbuf == '\0')
 463          goto jeinval;
 464    }else if(clen == 0)
 465       goto jeinval;
 466
 467    /* Leading WS */
 468    while(spacechar(*cbuf))
 469       if(*++cbuf == '\0' || --clen == 0)
 470          goto jeinval;
 471
 472    /* Check sign */
 473    switch(*cbuf){
 474    case '-':
 475       rv |= n_IDEC_STATE_SEEN_MINUS;
 476       /* FALLTHROUGH */
 477    case '+':
 478       if(*++cbuf == '\0' || --clen == 0)
 479          goto jeinval;
 480       break;
 481    }
 482
 483    /* Base detection/skip */
 484    if(*cbuf != '0'){
 485       if(base == 0)
 486          base = 10;
 487       /* Character must be valid for base */
 488       currc = a_aux_idec_atoi[(ui8_t)*cbuf];
 489       if(currc >= base)
 490          goto jeinval;
 491    }else{
 492       /* 0 always valid as is, fallback base 10 */
 493       if(*++cbuf == '\0' || --clen == 0)
 494          goto jleave;
 495
 496       /* Base "detection" */
 497       if(base == 0 || base == 2 || base == 16){
 498          switch(*cbuf){
 499          case 'x':
 500          case 'X':
 501             if((base & 2) == 0){
 502                base = 0x10;
 503                goto jprefix_skip;
 504             }
 505             break;
 506          case 'b':
 507          case 'B':
 508             if((base & 16) == 0){
 509                base = 2; /* 0b10 */
 510                /* Char after prefix must be valid */
 511 jprefix_skip:
 512                if(*++cbuf == '\0' || --clen == 0)
 513                   goto jeinval;
 514
 515                /* Character must be valid for base, invalid otherwise */
 516                currc = a_aux_idec_atoi[(ui8_t)*cbuf];
 517                if(currc >= base)
 518                   goto jeinval;
 519             }
 520             break;
 521          default:
 522             if(base == 0)
 523                base = 010;
 524             break;
 525          }
 526       }
 527
 528       /* Character must be valid for base, EBASE otherwise */
 529       currc = a_aux_idec_atoi[(ui8_t)*cbuf];
 530       if(currc >= base)
 531          goto jebase;
 532    }
 533
 534    for(cut = a_aux_idec_cutlimit[base - 2];;){
 535       if(res >= cut){
 536          if(res == cut){
 537             res *= base;
 538             if(res > UI64_MAX - currc)
 539                goto jeover;
 540             res += currc;
 541          }else
 542             goto jeover;
 543       }else{
 544          res *= base;
 545          res += currc;
 546       }
 547
 548       if(*++cbuf == '\0' || --clen == 0)
 549          break;
 550
 551       currc = a_aux_idec_atoi[(ui8_t)*cbuf];
 552       if(currc >= base)
 553          goto jebase;
 554    }
 555
 556 jleave:
 557    do{
 558       ui64_t uimask;
 559
 560       switch(rv & n__IDEC_MODE_LIMIT_MASK){
 561       case n_IDEC_MODE_LIMIT_8BIT: uimask = UI8_MAX; break;
 562       case n_IDEC_MODE_LIMIT_16BIT: uimask = UI16_MAX; break;
 563       case n_IDEC_MODE_LIMIT_32BIT: uimask = UI32_MAX; break;
 564       default: uimask = UI64_MAX; break;
 565       }
 566       if(rv & n_IDEC_MODE_SIGNED_TYPE)
 567          uimask >>= 1;
 568
 569       if(res & ~uimask){
 570          if((rv & (n_IDEC_MODE_SIGNED_TYPE | n_IDEC_STATE_SEEN_MINUS)
 571                ) == (n_IDEC_MODE_SIGNED_TYPE | n_IDEC_STATE_SEEN_MINUS)){
 572             if(res > uimask + 1){
 573                res = uimask << 1;
 574                res &= ~uimask;
 575             }else{
 576                res = -res;
 577                break;
 578             }
 579          }else
 580             res = uimask;
 581          if(!(rv & n_IDEC_MODE_LIMIT_NOERROR))
 582             rv |= n_IDEC_STATE_EOVERFLOW;
 583       }else if(rv & n_IDEC_STATE_SEEN_MINUS)
 584          res = -res;
 585    }while(0);
 586
 587    switch(rv & n__IDEC_MODE_LIMIT_MASK){
 588    case n_IDEC_MODE_LIMIT_8BIT:
 589       if(rv & n_IDEC_MODE_SIGNED_TYPE)
 590          *(si8_t*)resp = (si8_t)res;
 591       else
 592          *(ui8_t*)resp = (ui8_t)res;
 593       break;
 594    case n_IDEC_MODE_LIMIT_16BIT:
 595       if(rv & n_IDEC_MODE_SIGNED_TYPE)
 596          *(si16_t*)resp = (si16_t)res;
 597       else
 598          *(ui16_t*)resp = (ui16_t)res;
 599       break;
 600    case n_IDEC_MODE_LIMIT_32BIT:
 601       if(rv & n_IDEC_MODE_SIGNED_TYPE)
 602          *(si32_t*)resp = (si32_t)res;
 603       else
 604          *(ui32_t*)resp = (ui32_t)res;
 605       break;
 606    default:
 607       if(rv & n_IDEC_MODE_SIGNED_TYPE)
 608          *(si64_t*)resp = (si64_t)res;
 609       else
 610          *(ui64_t*)resp = (ui64_t)res;
 611       break;
 612    }
 613
 614    if(endptr_or_null != NULL)
 615       *endptr_or_null = cbuf;
 616    if(*cbuf == '\0' || clen == 0)
 617       rv |= n_IDEC_STATE_CONSUMED;
 618    NYD_LEAVE;
 619    return rv;
 620
 621 jeinval:
 622    rv |= n_IDEC_STATE_EINVAL;
 623    goto j_maxval;
 624 jebase:
 625    /* Not a base error for terminator and whitespace! */
 626    if(*cbuf != '\0' && !spacechar(*cbuf))
 627       rv |= n_IDEC_STATE_EBASE;
 628    goto jleave;
 629
 630 jeover:
 631    /* Overflow error: consume input until bad character or length out */
 632    for(;;){
 633       if(*++cbuf == '\0' || --clen == 0)
 634          break;
 635       currc = a_aux_idec_atoi[(ui8_t)*cbuf];
 636       if(currc >= base)
 637          break;
 638    }
 639
 640    rv |= n_IDEC_STATE_EOVERFLOW;
 641 j_maxval:
 642    if(rv & n_IDEC_MODE_SIGNED_TYPE)
 643       res = (rv & n_IDEC_STATE_SEEN_MINUS) ? (ui64_t)SI64_MIN
 644          : (ui64_t)SI64_MAX;
 645    else
 646       res = UI64_MAX;
 647    rv &= ~n_IDEC_STATE_SEEN_MINUS;
 648    goto jleave;
 649 }
 650
 651 FL ui32_t
 652 torek_hash(char const *name)
 653 {
 654    /* Chris Torek's hash.
 655     * NOTE: need to change *at least* mk-okey-map.pl when changing the
 656     * algorithm!! */
 657    ui32_t h = 0;
 658    NYD_ENTER;
 659
 660    while (*name != '\0') {
 661       h *= 33;
 662       h += *name++;
 663    }
 664    NYD_LEAVE;
 665    return h;
 666 }
 667
 668 FL ui32_t
 669 torek_ihashn(char const *dat, size_t len){
 670    /* See torek_hash() */
 671    char c;
 672    ui32_t h;
 673    NYD_ENTER;
 674
 675    for(h = 0; len > 0 && (c = *dat++) != '\0'; --len)
 676       h = (h * 33) + lowerconv(c);
 677    NYD_LEAVE;
 678    return h;
 679 }
 680
 681 FL ui32_t
 682 nextprime(ui32_t n)
 683 {
 684    static ui32_t const primes[] = {
 685       5, 11, 23, 47, 97, 157, 283,
 686       509, 1021, 2039, 4093, 8191, 16381, 32749, 65521,
 687       131071, 262139, 524287, 1048573, 2097143, 4194301,
 688       8388593, 16777213, 33554393, 67108859, 134217689,
 689       268435399, 536870909, 1073741789, 2147483647
 690    };
 691
 692    ui32_t i, mprime;
 693    NYD_ENTER;
 694
 695    i = (n < primes[n_NELEM(primes) / 4] ? 0
 696          : (n < primes[n_NELEM(primes) / 2] ? n_NELEM(primes) / 4
 697          : n_NELEM(primes) / 2));
 698    do
 699       if ((mprime = primes[i]) > n)
 700          break;
 701    while (++i < n_NELEM(primes));
 702    if (i == n_NELEM(primes) && mprime < n)
 703       mprime = n;
 704    NYD_LEAVE;
 705    return mprime;
 706 }
 707
 708 FL char const *
 709 n_getdeadletter(void){
 710    char const *cp_base, *cp;
 711    NYD_ENTER;
 712
 713    cp_base = NULL;
 714 jredo:
 715    cp = fexpand(ok_vlook(DEAD), FEXP_LOCAL | FEXP_NSHELL);
 716    if(cp == NULL || strlen(cp) >= PATH_MAX){
 717       if(cp_base == NULL){
 718          n_err(_("Failed to expand *DEAD*, setting default (%s): %s\n"),
 719             VAL_DEAD, n_shexp_quote_cp(cp, FAL0));
 720          ok_vclear(DEAD);
 721          goto jredo;
 722       }else{
 723          cp = savecatsep(ok_vlook(TMPDIR), '/', VAL_DEAD_BASENAME);
 724          n_err(_("Cannot expand *DEAD*, using: %s\n"), cp);
 725       }
 726    }
 727    NYD_LEAVE;
 728    return cp;
 729 }
 730
 731 FL char *
 732 nodename(int mayoverride)
 733 {
 734    static char *sys_hostname, *hostname; /* XXX free-at-exit */
 735
 736    struct utsname ut;
 737    char *hn;
 738 #ifdef HAVE_SOCKETS
 739 # ifdef HAVE_GETADDRINFO
 740    struct addrinfo hints, *res;
 741 # else
 742    struct hostent *hent;
 743 # endif
 744 #endif
 745    NYD_ENTER;
 746
 747    if (mayoverride && (hn = ok_vlook(hostname)) != NULL && *hn != '\0') {
 748       ;
 749    } else if ((hn = sys_hostname) == NULL) {
 750       uname(&ut);
 751       hn = ut.nodename;
 752 #ifdef HAVE_SOCKETS
 753 # ifdef HAVE_GETADDRINFO
 754       memset(&hints, 0, sizeof hints);
 755       hints.ai_family = AF_UNSPEC;
 756       hints.ai_flags = AI_CANONNAME;
 757       if (getaddrinfo(hn, NULL, &hints, &res) == 0) {
 758          if (res->ai_canonname != NULL) {
 759             size_t l = strlen(res->ai_canonname) +1;
 760
 761             hn = ac_alloc(l);
 762             memcpy(hn, res->ai_canonname, l);
 763          }
 764          freeaddrinfo(res);
 765       }
 766 # else
 767       hent = gethostbyname(hn);
 768       if (hent != NULL)
 769          hn = hent->h_name;
 770 # endif
 771 #endif
 772       sys_hostname = sstrdup(hn);
 773 #if defined HAVE_SOCKETS && defined HAVE_GETADDRINFO
 774       if (hn != ut.nodename)
 775          ac_free(hn);
 776 #endif
 777       hn = sys_hostname;
 778    }
 779
 780    if (hostname != NULL && hostname != sys_hostname)
 781       free(hostname);
 782    hostname = sstrdup(hn);
 783    NYD_LEAVE;
 784    return hostname;
 785 }
 786
 787 FL char *
 788 getrandstring(size_t length){
 789    struct str b64;
 790    char *data;
 791    size_t i;
 792    NYD_ENTER;
 793
 794 #ifndef HAVE_POSIX_RANDOM
 795    if(a_aux_rand == NULL)
 796       a_aux_rand_init();
 797 #endif
 798
 799    /* We use our base64 encoder with _NOPAD set, so ensure the encoded result
 800     * with PAD stripped is still longer than what the user requests, easy way */
 801    data = n_lofi_alloc(i = length + 3);
 802
 803 #ifndef HAVE_POSIX_RANDOM
 804    while(i-- > 0)
 805       data[i] = (char)a_aux_rand_get8();
 806 #else
 807    {  char *cp;
 808
 809       for(cp = data; i > 0;){
 810          union {ui32_t i4; char c[4];} r;
 811          size_t j;
 812
 813          r.i4 = (ui32_t)arc4random();
 814          switch((j = i & 3)){
 815          case 0:  cp[3] = r.c[3]; j = 4;
 816          case 3:  cp[2] = r.c[2];
 817          case 2:  cp[1] = r.c[1];
 818          default: cp[0] = r.c[0]; break;
 819          }
 820          cp += j;
 821          i -= j;
 822       }
 823    }
 824 #endif
 825
 826    assert(length + 3 < UIZ_MAX / 4);
 827    b64_encode_buf(&b64, data, length + 3,
 828       B64_SALLOC | B64_RFC4648URL | B64_NOPAD);
 829    ac_free(data);
 830
 831    assert(b64.l >= length);
 832    b64.s[length] = '\0';
 833    NYD_LEAVE;
 834    return b64.s;
 835 }
 836
 837 FL si8_t
 838 boolify(char const *inbuf, uiz_t inlen, si8_t emptyrv)
 839 {
 840    si8_t rv;
 841    NYD_ENTER;
 842
 843    assert(inlen == 0 || inbuf != NULL);
 844
 845    if (inlen == UIZ_MAX)
 846       inlen = strlen(inbuf);
 847
 848    if (inlen == 0)
 849       rv = (emptyrv >= 0) ? (emptyrv == 0 ? 0 : 1) : -1;
 850    else {
 851       if ((inlen == 1 && (*inbuf == '1' || *inbuf == 'y' || *inbuf == 'Y')) ||
 852             !ascncasecmp(inbuf, "true", inlen) ||
 853             !ascncasecmp(inbuf, "yes", inlen) ||
 854             !ascncasecmp(inbuf, "on", inlen))
 855          rv = 1;
 856       else if ((inlen == 1 &&
 857                (*inbuf == '0' || *inbuf == 'n' || *inbuf == 'N')) ||
 858             !ascncasecmp(inbuf, "false", inlen) ||
 859             !ascncasecmp(inbuf, "no", inlen) ||
 860             !ascncasecmp(inbuf, "off", inlen))
 861          rv = 0;
 862       else {
 863          ui64_t ib;
 864
 865          if((n_idec_buf(&ib, inbuf, inlen, 0, 0, NULL
 866                   ) & (n_IDEC_STATE_EMASK | n_IDEC_STATE_CONSUMED)
 867                ) != n_IDEC_STATE_CONSUMED)
 868             rv = -1;
 869          else
 870             rv = (ib != 0);
 871       }
 872    }
 873    NYD_LEAVE;
 874    return rv;
 875 }
 876
 877 FL si8_t
 878 quadify(char const *inbuf, uiz_t inlen, char const *prompt, si8_t emptyrv)
 879 {
 880    si8_t rv;
 881    NYD_ENTER;
 882
 883    assert(inlen == 0 || inbuf != NULL);
 884
 885    if (inlen == UIZ_MAX)
 886       inlen = strlen(inbuf);
 887
 888    if (inlen == 0)
 889       rv = (emptyrv >= 0) ? (emptyrv == 0 ? 0 : 1) : -1;
 890    else if ((rv = boolify(inbuf, inlen, -1)) < 0 &&
 891          !ascncasecmp(inbuf, "ask-", 4) &&
 892          (rv = boolify(inbuf + 4, inlen - 4, -1)) >= 0 &&
 893          (n_psonce & n_PSO_INTERACTIVE))
 894       rv = getapproval(prompt, rv);
 895    NYD_LEAVE;
 896    return rv;
 897 }
 898
 899 FL bool_t
 900 n_is_all_or_aster(char const *name){
 901    bool_t rv;
 902    NYD_ENTER;
 903
 904    rv = ((name[0] == '*' && name[1] == '\0') || !asccasecmp(name, "all"));
 905    NYD_LEAVE;
 906    return rv;
 907 }
 908
 909 FL time_t
 910 n_time_epoch(void)
 911 {
 912 #ifdef HAVE_CLOCK_GETTIME
 913    struct timespec ts;
 914 #elif defined HAVE_GETTIMEOFDAY
 915    struct timeval ts;
 916 #endif
 917    time_t rv;
 918    char const *cp;
 919    NYD2_ENTER;
 920
 921    if((cp = ok_vlook(SOURCE_DATE_EPOCH)) != NULL){
 922       ui64_t tib;
 923
 924       (void)/* XXX ?? posnum= */n_idec_ui64_cp(&tib, cp, 0, NULL);
 925       rv = (time_t)tib;
 926       goto jleave;
 927    }
 928
 929 #ifdef HAVE_CLOCK_GETTIME
 930    clock_gettime(CLOCK_REALTIME, &ts);
 931    rv = (time_t)ts.tv_sec;
 932 #elif defined HAVE_GETTIMEOFDAY
 933    gettimeofday(&ts, NULL);
 934    rv = (time_t)ts.tv_sec;
 935 #else
 936    rv = time(NULL);
 937 #endif
 938 jleave:
 939    NYD2_LEAVE;
 940    return rv;
 941 }
 942
 943 FL void
 944 time_current_update(struct time_current *tc, bool_t full_update)
 945 {
 946    NYD_ENTER;
 947    tc->tc_time = n_time_epoch();
 948    if (full_update) {
 949       memcpy(&tc->tc_gm, gmtime(&tc->tc_time), sizeof tc->tc_gm);
 950       memcpy(&tc->tc_local, localtime(&tc->tc_time), sizeof tc->tc_local);
 951       sstpcpy(tc->tc_ctime, ctime(&tc->tc_time));
 952    }
 953    NYD_LEAVE;
 954 }
 955
 956 FL uiz_t
 957 n_msleep(uiz_t millis, bool_t ignint){
 958    uiz_t rv;
 959    NYD2_ENTER;
 960
 961 #ifdef HAVE_NANOSLEEP
 962    /* C99 */{
 963       struct timespec ts, trem;
 964       int i;
 965
 966       ts.tv_sec = millis / 1000;
 967       ts.tv_nsec = (millis %= 1000) * 1000 * 1000;
 968
 969       while((i = nanosleep(&ts, &trem)) != 0 && ignint)
 970          ts = trem;
 971       rv = (i == 0) ? 0 : (trem.tv_sec * 1000) + (trem.tv_nsec / (1000 * 1000));
 972    }
 973
 974 #elif defined HAVE_SLEEP
 975    if((millis /= 1000) == 0)
 976       millis = 1;
 977    while((rv = sleep((unsigned int)millis)) != 0 && ignint)
 978       millis = rv;
 979 #else
 980 # error Configuration should have detected a function for sleeping.
 981 #endif
 982
 983    NYD2_LEAVE;
 984    return rv;
 985 }
 986
 987 FL void
 988 n_err(char const *format, ...){
 989    va_list ap;
 990    NYD2_ENTER;
 991
 992    va_start(ap, format);
 993 #ifdef HAVE_ERRORS
 994    if(n_psonce & n_PSO_INTERACTIVE)
 995       n_verr(format, ap);
 996    else
 997 #endif
 998    {
 999       size_t len;
1000       bool_t doname, doflush;
1001
1002       doflush = FAL0;
1003       while(*format == '\n'){
1004          doflush = TRU1;
1005          putc('\n', n_stderr);
1006          ++format;
1007       }
1008
1009       if((doname = doflush))
1010          a_aux_err_linelen = 0;
1011
1012       if((len = strlen(format)) > 0){
1013          if(doname || a_aux_err_linelen == 0)
1014             fputs(VAL_UAGENT ": ", n_stderr);
1015          vfprintf(n_stderr, format, ap);
1016
1017          /* C99 */{
1018             size_t i = len;
1019             do{
1020                if(format[--len] == '\n'){
1021                   a_aux_err_linelen = (i -= ++len);
1022                   break;
1023                }
1024                ++a_aux_err_linelen;
1025             }while(len > 0);
1026          }
1027       }
1028
1029       if(doflush)
1030          fflush(n_stderr);
1031    }
1032    va_end(ap);
1033    NYD2_LEAVE;
1034 }
1035
1036 FL void
1037 n_verr(char const *format, va_list ap){
1038 #ifdef HAVE_ERRORS
1039    struct a_aux_err_node *enp;
1040 #endif
1041    bool_t doname, doflush;
1042    size_t len;
1043    NYD2_ENTER;
1044
1045    doflush = FAL0;
1046    while(*format == '\n'){
1047       doflush = TRU1;
1048       putc('\n', n_stderr);
1049       ++format;
1050    }
1051
1052    if((doname = doflush)){
1053       a_aux_err_linelen = 0;
1054 #ifdef HAVE_ERRORS
1055       if(n_psonce & n_PSO_INTERACTIVE){
1056          if((enp = a_aux_err_tail) != NULL &&
1057                (enp->ae_str.s_len > 0 &&
1058                 enp->ae_str.s_dat[enp->ae_str.s_len - 1] != '\n'))
1059             n_string_push_c(&enp->ae_str, '\n');
1060       }
1061 #endif
1062    }
1063
1064    if((len = strlen(format)) == 0)
1065       goto jleave;
1066 #ifdef HAVE_ERRORS
1067    n_pstate |= n_PS_ERRORS_PROMPT;
1068 #endif
1069
1070    if(doname || a_aux_err_linelen == 0)
1071       fputs(VAL_UAGENT ": ", n_stderr);
1072
1073    /* C99 */{
1074       size_t i = len;
1075       do{
1076          if(format[--len] == '\n'){
1077             a_aux_err_linelen = (i -= ++len);
1078             break;
1079          }
1080          ++a_aux_err_linelen;
1081       }while(len > 0);
1082    }
1083
1084 #ifdef HAVE_ERRORS
1085    if(!(n_psonce & n_PSO_INTERACTIVE))
1086 #endif
1087       vfprintf(n_stderr, format, ap);
1088 #ifdef HAVE_ERRORS
1089    else{
1090       int imax, i;
1091       n_LCTAV(ERRORS_MAX > 3);
1092
1093       /* Link it into the `errors' message ring */
1094       if((enp = a_aux_err_tail) == NULL){
1095 jcreat:
1096          enp = smalloc(sizeof *enp);
1097          enp->ae_next = NULL;
1098          n_string_creat(&enp->ae_str);
1099          if(a_aux_err_tail != NULL)
1100             a_aux_err_tail->ae_next = enp;
1101          else
1102             a_aux_err_head = enp;
1103          a_aux_err_tail = enp;
1104          ++a_aux_err_cnt;
1105       }else if(doname ||
1106             (enp->ae_str.s_len > 0 &&
1107              enp->ae_str.s_dat[enp->ae_str.s_len - 1] == '\n')){
1108          if(a_aux_err_cnt < ERRORS_MAX)
1109             goto jcreat;
1110
1111          a_aux_err_head = (enp = a_aux_err_head)->ae_next;
1112          a_aux_err_tail->ae_next = enp;
1113          a_aux_err_tail = enp;
1114          enp->ae_next = NULL;
1115          n_string_trunc(&enp->ae_str, 0);
1116       }
1117
1118 # ifdef HAVE_N_VA_COPY
1119       imax = 64;
1120 # else
1121       imax = n_MIN(LINESIZE, 1024);
1122 # endif
1123       for(i = imax;; imax = ++i /* xxx could wrap, maybe */){
1124 # ifdef HAVE_N_VA_COPY
1125          va_list vac;
1126
1127          n_va_copy(vac, ap);
1128 # else
1129 #  define vac ap
1130 # endif
1131
1132          n_string_resize(&enp->ae_str, (len = enp->ae_str.s_len) + (size_t)i);
1133          i = vsnprintf(&enp->ae_str.s_dat[len], (size_t)i, format, vac);
1134 # ifdef HAVE_N_VA_COPY
1135          va_end(vac);
1136 # else
1137 #  undef vac
1138 # endif
1139          if(i <= 0)
1140             goto jleave;
1141          if(UICMP(z, i, >=, imax)){
1142 # ifdef HAVE_N_VA_COPY
1143             /* XXX Check overflow for upcoming LEN+++i! */
1144             n_string_trunc(&enp->ae_str, len);
1145             continue;
1146 # else
1147             i = (int)strlen(&enp->ae_str.s_dat[len]);
1148 # endif
1149          }
1150          break;
1151       }
1152       n_string_trunc(&enp->ae_str, len + (size_t)i);
1153
1154       fwrite(&enp->ae_str.s_dat[len], 1, (size_t)i, n_stderr);
1155    }
1156 #endif /* HAVE_ERRORS */
1157
1158 jleave:
1159    if(doflush)
1160       fflush(n_stderr);
1161    NYD2_LEAVE;
1162 }
1163
1164 FL void
1165 n_err_sighdl(char const *format, ...){ /* TODO sigsafe; obsolete! */
1166    va_list ap;
1167    NYD_X;
1168
1169    va_start(ap, format);
1170    vfprintf(n_stderr, format, ap);
1171    va_end(ap);
1172    fflush(n_stderr);
1173 }
1174
1175 FL void
1176 n_perr(char const *msg, int errval){
1177    int e;
1178    char const *fmt;
1179    NYD2_ENTER;
1180
1181    if(msg == NULL){
1182       fmt = "%s%s\n";
1183       msg = n_empty;
1184    }else
1185       fmt = "%s: %s\n";
1186
1187    e = (errval == 0) ? errno : errval;
1188    n_err(fmt, msg, strerror(e));
1189    if(errval == 0)
1190       errno = e;
1191    NYD2_LEAVE;
1192 }
1193
1194 FL void
1195 n_alert(char const *format, ...){
1196    va_list ap;
1197    NYD2_ENTER;
1198
1199    n_err(a_aux_err_linelen > 0 ? _("\nAlert: ") : _("Alert: "));
1200
1201    va_start(ap, format);
1202    n_verr(format, ap);
1203    va_end(ap);
1204
1205    n_err("\n");
1206    NYD2_LEAVE;
1207 }
1208
1209 FL void
1210 n_panic(char const *format, ...){
1211    va_list ap;
1212    NYD2_ENTER;
1213
1214    if(a_aux_err_linelen > 0){
1215       putc('\n', n_stderr);
1216       a_aux_err_linelen = 0;
1217    }
1218    fprintf(n_stderr, VAL_UAGENT ": Panic: ");
1219
1220    va_start(ap, format);
1221    vfprintf(n_stderr, format, ap);
1222    va_end(ap);
1223
1224    putc('\n', n_stderr);
1225    fflush(n_stderr);
1226    NYD2_LEAVE;
1227    abort(); /* Was exit(n_EXIT_ERR); for a while, but no */
1228 }
1229
1230 #ifdef HAVE_ERRORS
1231 FL int
1232 c_errors(void *v){
1233    char **argv = v;
1234    struct a_aux_err_node *enp;
1235    NYD_ENTER;
1236
1237    if(*argv == NULL)
1238       goto jlist;
1239    if(argv[1] != NULL)
1240       goto jerr;
1241    if(!asccasecmp(*argv, "show"))
1242       goto jlist;
1243    if(!asccasecmp(*argv, "clear"))
1244       goto jclear;
1245 jerr:
1246    fprintf(n_stderr,
1247       _("Synopsis: errors: (<show> or) <clear> the error ring\n"));
1248    v = NULL;
1249 jleave:
1250    NYD_LEAVE;
1251    return (v == NULL) ? !STOP : !OKAY; /* xxx 1:bad 0:good -- do some */
1252
1253 jlist:{
1254       FILE *fp;
1255       size_t i;
1256
1257       if(a_aux_err_head == NULL){
1258          fprintf(n_stderr, _("The error ring is empty\n"));
1259          goto jleave;
1260       }
1261
1262       if((fp = Ftmp(NULL, "errors", OF_RDWR | OF_UNLINK | OF_REGISTER)) ==
1263             NULL){
1264          fprintf(n_stderr, _("tmpfile"));
1265          v = NULL;
1266          goto jleave;
1267       }
1268
1269       for(i = 0, enp = a_aux_err_head; enp != NULL; enp = enp->ae_next)
1270          fprintf(fp, "%4" PRIuZ ". %s", ++i, n_string_cp(&enp->ae_str));
1271       /* We don't know whether last string ended with NL; be simple XXX */
1272       putc('\n', fp);
1273
1274       page_or_print(fp, 0);
1275       Fclose(fp);
1276    }
1277    /* FALLTHRU */
1278
1279 jclear:
1280    a_aux_err_tail = NULL;
1281    a_aux_err_cnt = a_aux_err_cnt_noted = 0;
1282    a_aux_err_linelen = 0;
1283    while((enp = a_aux_err_head) != NULL){
1284       a_aux_err_head = enp->ae_next;
1285       n_string_gut(&enp->ae_str);
1286       free(enp);
1287    }
1288    goto jleave;
1289 }
1290 #endif /* HAVE_ERRORS */
1291
1292 #ifdef HAVE_REGEX
1293 FL char const *
1294 n_regex_err_to_str(const regex_t *rep, int e){
1295    char *cp;
1296    size_t i;
1297    NYD2_ENTER;
1298
1299    i = regerror(e, rep, NULL, 0) +1;
1300    cp = salloc(i);
1301    regerror(e, rep, cp, i);
1302    NYD2_LEAVE;
1303    return cp;
1304 }
1305 #endif
1306
1307 /* s-it-mode */