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ns_print.c

/*
 * Copyright (c) 1996-1999 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#if !defined(_LIBC) && !defined(lint)
static const char rcsid[] = "$BINDId: ns_print.c,v 8.18 2000/02/29 05:48:12 vixie Exp $";
#endif

/* Import. */

#include <sys/types.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>

#include <assert.h>
#include <errno.h>
#include <resolv.h>
#include <string.h>
#include <ctype.h>

#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) ((size_t)sprintf x)
#endif

/* Forward. */

static size_t     prune_origin(const char *name, const char *origin);
static int  charstr(const u_char *rdata, const u_char *edata,
                  char **buf, size_t *buflen);
static int  addname(const u_char *msg, size_t msglen,
                  const u_char **p, const char *origin,
                  char **buf, size_t *buflen);
static void addlen(size_t len, char **buf, size_t *buflen);
static int  addstr(const char *src, size_t len,
                   char **buf, size_t *buflen);
static int  addtab(size_t len, size_t target, int spaced,
                   char **buf, size_t *buflen);

/* Proto. */

#ifndef _LIBC
u_int16_t       dst_s_dns_key_id(const u_char *, const int);
#endif

/* Macros. */

#define     T(x) \
      do { \
            if ((x) < 0) \
                  return (-1); \
      } while (0)

/* Public. */

/*
 * int
 * ns_sprintrr(handle, rr, name_ctx, origin, buf, buflen)
 *    Convert an RR to presentation format.
 * return:
 *    Number of characters written to buf, or -1 (check errno).
 */
int
ns_sprintrr(const ns_msg *handle, const ns_rr *rr,
          const char *name_ctx, const char *origin,
          char *buf, size_t buflen)
{
      int n;

      n = ns_sprintrrf(ns_msg_base(*handle), ns_msg_size(*handle),
                   ns_rr_name(*rr), ns_rr_class(*rr), ns_rr_type(*rr),
                   ns_rr_ttl(*rr), ns_rr_rdata(*rr), ns_rr_rdlen(*rr),
                   name_ctx, origin, buf, buflen);
      return (n);
}

/*
 * int
 * ns_sprintrrf(msg, msglen, name, class, type, ttl, rdata, rdlen,
 *           name_ctx, origin, buf, buflen)
 *    Convert the fields of an RR into presentation format.
 * return:
 *    Number of characters written to buf, or -1 (check errno).
 */
int
ns_sprintrrf(const u_char *msg, size_t msglen,
          const char *name, ns_class class, ns_type type,
          u_long ttl, const u_char *rdata, size_t rdlen,
          const char *name_ctx, const char *origin,
          char *buf, size_t buflen)
{
      const char *obuf = buf;
      const u_char *edata = rdata + rdlen;
      int spaced = 0;

      const char *comment;
      char tmp[100];
      int len, x;

      /*
       * Owner.
       */
      if (name_ctx != NULL && ns_samename(name_ctx, name) == 1) {
            T(addstr("\t\t\t", 3, &buf, &buflen));
      } else {
            len = prune_origin(name, origin);
            if (len == 0) {
                  T(addstr("@\t\t\t", 4, &buf, &buflen));
            } else {
                  T(addstr(name, len, &buf, &buflen));
                  /* Origin not used or not root, and no trailing dot? */
                  if (((origin == NULL || origin[0] == '\0') ||
                      (origin[0] != '.' && origin[1] != '\0' &&
                      name[len] == '\0')) && name[len - 1] != '.') {
                        T(addstr(".", 1, &buf, &buflen));
                        len++;
                  }
                  T(spaced = addtab(len, 24, spaced, &buf, &buflen));
            }
      }

      /*
       * TTL, Class, Type.
       */
      T(x = ns_format_ttl(ttl, buf, buflen));
      addlen(x, &buf, &buflen);
      len = SPRINTF((tmp, " %s %s", p_class(class), p_type(type)));
      T(addstr(tmp, len, &buf, &buflen));
      T(spaced = addtab(x + len, 16, spaced, &buf, &buflen));

      /*
       * RData.
       */
      switch (type) {
      case ns_t_a:
            if (rdlen != NS_INADDRSZ)
                  goto formerr;
            (void) inet_ntop(AF_INET, rdata, buf, buflen);
            addlen(strlen(buf), &buf, &buflen);
            break;

      case ns_t_cname:
      case ns_t_mb:
      case ns_t_mg:
      case ns_t_mr:
      case ns_t_ns:
      case ns_t_ptr:
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
            break;

      case ns_t_hinfo:
      case ns_t_isdn:
            /* First word. */
            T(len = charstr(rdata, edata, &buf, &buflen));
            if (len == 0)
                  goto formerr;
            rdata += len;
            T(addstr(" ", 1, &buf, &buflen));

                
            /* Second word, optional in ISDN records. */
            if (type == ns_t_isdn && rdata == edata)
                  break;
                
            T(len = charstr(rdata, edata, &buf, &buflen));
            if (len == 0)
                  goto formerr;
            rdata += len;
            break;

      case ns_t_soa: {
            u_long t;

            /* Server name. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
            T(addstr(" ", 1, &buf, &buflen));

            /* Administrator name. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
            T(addstr(" (\n", 3, &buf, &buflen));
            spaced = 0;

            if ((edata - rdata) != 5*NS_INT32SZ)
                  goto formerr;

            /* Serial number. */
            t = ns_get32(rdata);  rdata += NS_INT32SZ;
            T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
            len = SPRINTF((tmp, "%lu", t));
            T(addstr(tmp, len, &buf, &buflen));
            T(spaced = addtab(len, 16, spaced, &buf, &buflen));
            T(addstr("; serial\n", 9, &buf, &buflen));
            spaced = 0;

            /* Refresh interval. */
            t = ns_get32(rdata);  rdata += NS_INT32SZ;
            T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
            T(len = ns_format_ttl(t, buf, buflen));
            addlen(len, &buf, &buflen);
            T(spaced = addtab(len, 16, spaced, &buf, &buflen));
            T(addstr("; refresh\n", 10, &buf, &buflen));
            spaced = 0;

            /* Retry interval. */
            t = ns_get32(rdata);  rdata += NS_INT32SZ;
            T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
            T(len = ns_format_ttl(t, buf, buflen));
            addlen(len, &buf, &buflen);
            T(spaced = addtab(len, 16, spaced, &buf, &buflen));
            T(addstr("; retry\n", 8, &buf, &buflen));
            spaced = 0;

            /* Expiry. */
            t = ns_get32(rdata);  rdata += NS_INT32SZ;
            T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
            T(len = ns_format_ttl(t, buf, buflen));
            addlen(len, &buf, &buflen);
            T(spaced = addtab(len, 16, spaced, &buf, &buflen));
            T(addstr("; expiry\n", 9, &buf, &buflen));
            spaced = 0;

            /* Minimum TTL. */
            t = ns_get32(rdata);  rdata += NS_INT32SZ;
            T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
            T(len = ns_format_ttl(t, buf, buflen));
            addlen(len, &buf, &buflen);
            T(addstr(" )", 2, &buf, &buflen));
            T(spaced = addtab(len, 16, spaced, &buf, &buflen));
            T(addstr("; minimum\n", 10, &buf, &buflen));

            break;
          }

      case ns_t_mx:
      case ns_t_afsdb:
      case ns_t_rt: {
            u_int t;

            if (rdlen < NS_INT16SZ)
                  goto formerr;

            /* Priority. */
            t = ns_get16(rdata);
            rdata += NS_INT16SZ;
            len = SPRINTF((tmp, "%u ", t));
            T(addstr(tmp, len, &buf, &buflen));

            /* Target. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));

            break;
          }

      case ns_t_px: {
            u_int t;

            if (rdlen < NS_INT16SZ)
                  goto formerr;

            /* Priority. */
            t = ns_get16(rdata);
            rdata += NS_INT16SZ;
            len = SPRINTF((tmp, "%u ", t));
            T(addstr(tmp, len, &buf, &buflen));

            /* Name1. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
            T(addstr(" ", 1, &buf, &buflen));

            /* Name2. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));

            break;
          }

      case ns_t_x25:
            T(len = charstr(rdata, edata, &buf, &buflen));
            if (len == 0)
                  goto formerr;
            rdata += len;
            break;

      case ns_t_txt:
            while (rdata < edata) {
                  T(len = charstr(rdata, edata, &buf, &buflen));
                  if (len == 0)
                        goto formerr;
                  rdata += len;
                  if (rdata < edata)
                        T(addstr(" ", 1, &buf, &buflen));
            }
            break;

      case ns_t_nsap: {
            /* 2*255 for hex digits, 128 for '.' and '\0', 2 for
               0x if inet_nsap_ntoa starts using it.  */
            char t[255*2 + 128 + 2];

            (void) inet_nsap_ntoa(rdlen, rdata, t);
            T(addstr(t, strlen(t), &buf, &buflen));
            break;
          }

      case ns_t_aaaa:
            if (rdlen != NS_IN6ADDRSZ)
                  goto formerr;
            (void) inet_ntop(AF_INET6, rdata, buf, buflen);
            addlen(strlen(buf), &buf, &buflen);
            break;

      case ns_t_loc: {
            char t[255];

            /* XXX protocol format checking? */
            (void) loc_ntoa(rdata, t);
            T(addstr(t, strlen(t), &buf, &buflen));
            break;
          }

      case ns_t_naptr: {
            u_int order, preference;
            char t[50];

            if (rdlen < 2*NS_INT16SZ)
                  goto formerr;

            /* Order, Precedence. */
            order = ns_get16(rdata);      rdata += NS_INT16SZ;
            preference = ns_get16(rdata); rdata += NS_INT16SZ;
            len = SPRINTF((t, "%u %u ", order, preference));
            T(addstr(t, len, &buf, &buflen));

            /* Flags. */
            T(len = charstr(rdata, edata, &buf, &buflen));
            if (len == 0)
                  goto formerr;
            rdata += len;
            T(addstr(" ", 1, &buf, &buflen));

            /* Service. */
            T(len = charstr(rdata, edata, &buf, &buflen));
            if (len == 0)
                  goto formerr;
            rdata += len;
            T(addstr(" ", 1, &buf, &buflen));

            /* Regexp. */
            T(len = charstr(rdata, edata, &buf, &buflen));
            if (len < 0)
                  return (-1);
            if (len == 0)
                  goto formerr;
            rdata += len;
            T(addstr(" ", 1, &buf, &buflen));

            /* Server. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
            break;
          }

      case ns_t_srv: {
            u_int priority, weight, port;
            char t[50];

            if (rdlen < NS_INT16SZ*3)
                  goto formerr;

            /* Priority, Weight, Port. */
            priority = ns_get16(rdata);  rdata += NS_INT16SZ;
            weight   = ns_get16(rdata);  rdata += NS_INT16SZ;
            port     = ns_get16(rdata);  rdata += NS_INT16SZ;
            len = SPRINTF((t, "%u %u %u ", priority, weight, port));
            T(addstr(t, len, &buf, &buflen));

            /* Server. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
            break;
          }

      case ns_t_minfo:
      case ns_t_rp:
            /* Name1. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
            T(addstr(" ", 1, &buf, &buflen));

            /* Name2. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));

            break;

      case ns_t_wks: {
            int n, lcnt;

            if (rdlen < NS_INT32SZ + 1)
                  goto formerr;

            /* Address. */
            (void) inet_ntop(AF_INET, rdata, buf, buflen);
            addlen(strlen(buf), &buf, &buflen);
            rdata += NS_INADDRSZ;

            /* Protocol. */
            len = SPRINTF((tmp, " %u ( ", *rdata));
            T(addstr(tmp, len, &buf, &buflen));
            rdata += NS_INT8SZ;

            /* Bit map. */
            n = 0;
            lcnt = 0;
            while (rdata < edata) {
                  u_int c = *rdata++;
                  do {
                        if (c & 0200) {
                              if (lcnt == 0) {
                                    T(addstr("\n\t\t\t\t", 5,
                                           &buf, &buflen));
                                    lcnt = 10;
                                    spaced = 0;
                              }
                              len = SPRINTF((tmp, "%d ", n));
                              T(addstr(tmp, len, &buf, &buflen));
                              lcnt--;
                        }
                        c <<= 1;
                  } while (++n & 07);
            }
            T(addstr(")", 1, &buf, &buflen));

            break;
          }

      case ns_t_key: {
#ifndef _LIBC
            char base64_key[NS_MD5RSA_MAX_BASE64];
            u_int keyflags, protocol, algorithm, key_id;
            const char *leader;
            int n;

            if (rdlen < NS_INT16SZ + NS_INT8SZ + NS_INT8SZ)
                  goto formerr;

            /* Key flags, Protocol, Algorithm. */
            key_id = dst_s_dns_key_id(rdata, edata-rdata);
            keyflags = ns_get16(rdata);  rdata += NS_INT16SZ;
            protocol = *rdata++;
            algorithm = *rdata++;
            len = SPRINTF((tmp, "0x%04x %u %u",
                         keyflags, protocol, algorithm));
            T(addstr(tmp, len, &buf, &buflen));

            /* Public key data. */
            len = b64_ntop(rdata, edata - rdata,
                         base64_key, sizeof base64_key);
            if (len < 0)
                  goto formerr;
            if (len > 15) {
                  T(addstr(" (", 2, &buf, &buflen));
                  leader = "\n\t\t";
                  spaced = 0;
            } else
                  leader = " ";
            for (n = 0; n < len; n += 48) {
                  T(addstr(leader, strlen(leader), &buf, &buflen));
                  T(addstr(base64_key + n, MIN(len - n, 48),
                         &buf, &buflen));
            }
            if (len > 15)
                  T(addstr(" )", 2, &buf, &buflen));
            n = SPRINTF((tmp, " ; key_tag= %u", key_id));
            T(addstr(tmp, n, &buf, &buflen));
#endif /* !_LIBC */

            break;
          }

      case ns_t_sig: {
#ifndef _LIBC
            char base64_key[NS_MD5RSA_MAX_BASE64];
            u_int type, algorithm, labels, footprint;
            const char *leader;
            u_long t;
            int n;

            if (rdlen < 22)
                  goto formerr;

            /* Type covered, Algorithm, Label count, Original TTL. */
              type = ns_get16(rdata);  rdata += NS_INT16SZ;
            algorithm = *rdata++;
            labels = *rdata++;
            t = ns_get32(rdata);  rdata += NS_INT32SZ;
            len = SPRINTF((tmp, "%s %d %d %lu ",
                         p_type(type), algorithm, labels, t));
            T(addstr(tmp, len, &buf, &buflen));
            if (labels > (u_int)dn_count_labels(name))
                  goto formerr;

            /* Signature expiry. */
            t = ns_get32(rdata);  rdata += NS_INT32SZ;
            len = SPRINTF((tmp, "%s ", p_secstodate(t)));
            T(addstr(tmp, len, &buf, &buflen));

            /* Time signed. */
            t = ns_get32(rdata);  rdata += NS_INT32SZ;
            len = SPRINTF((tmp, "%s ", p_secstodate(t)));
            T(addstr(tmp, len, &buf, &buflen));

            /* Signature Footprint. */
            footprint = ns_get16(rdata);  rdata += NS_INT16SZ;
            len = SPRINTF((tmp, "%u ", footprint));
            T(addstr(tmp, len, &buf, &buflen));

            /* Signer's name. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));

            /* Signature. */
            len = b64_ntop(rdata, edata - rdata,
                         base64_key, sizeof base64_key);
            if (len > 15) {
                  T(addstr(" (", 2, &buf, &buflen));
                  leader = "\n\t\t";
                  spaced = 0;
            } else
                  leader = " ";
            if (len < 0)
                  goto formerr;
            for (n = 0; n < len; n += 48) {
                  T(addstr(leader, strlen(leader), &buf, &buflen));
                  T(addstr(base64_key + n, MIN(len - n, 48),
                         &buf, &buflen));
            }
            if (len > 15)
                  T(addstr(" )", 2, &buf, &buflen));
#endif /* !_LIBC */
            break;
          }

      case ns_t_nxt: {
            int n, c;

            /* Next domain name. */
            T(addname(msg, msglen, &rdata, origin, &buf, &buflen));

            /* Type bit map. */
            n = edata - rdata;
            for (c = 0; c < n*8; c++)
                  if (NS_NXT_BIT_ISSET(c, rdata)) {
                        len = SPRINTF((tmp, " %s", p_type(c)));
                        T(addstr(tmp, len, &buf, &buflen));
                  }
            break;
          }

      case ns_t_cert: {
            u_int c_type, key_tag, alg;
            int n, siz;
            char base64_cert[8192], *leader, tmp[40];

            c_type  = ns_get16(rdata); rdata += NS_INT16SZ;
            key_tag = ns_get16(rdata); rdata += NS_INT16SZ;
            alg = (u_int) *rdata++;

            len = SPRINTF((tmp, "%d %d %d ", c_type, key_tag, alg));
            T(addstr(tmp, len, &buf, &buflen));
            siz = (edata-rdata)*4/3 + 4; /* "+4" accounts for trailing \0 */
            if (siz > sizeof(base64_cert) * 3/4) {
                  char *str = "record too long to print";
                  T(addstr(str, strlen(str), &buf, &buflen));
            }
            else {
                  len = b64_ntop(rdata, edata-rdata, base64_cert, siz);

                  if (len < 0)
                        goto formerr;
                  else if (len > 15) {
                        T(addstr(" (", 2, &buf, &buflen));
                        leader = "\n\t\t";
                        spaced = 0;
                  }
                  else
                        leader = " ";
      
                  for (n = 0; n < len; n += 48) {
                        T(addstr(leader, strlen(leader),
                               &buf, &buflen));
                        T(addstr(base64_cert + n, MIN(len - n, 48),
                               &buf, &buflen));
                  }
                  if (len > 15)
                        T(addstr(" )", 2, &buf, &buflen));
            }
            break;
          }

      case ns_t_tsig: {
            /* BEW - need to complete this */
            int n;

            T(len = addname(msg, msglen, &rdata, origin, &buf, &buflen));
            T(addstr(" ", 1, &buf, &buflen));
            rdata += 8; /* time */
            n = ns_get16(rdata); rdata += INT16SZ;
            rdata += n; /* sig */
            n = ns_get16(rdata); rdata += INT16SZ; /* original id */
            sprintf(buf, "%d", ns_get16(rdata));
            rdata += INT16SZ;
            addlen(strlen(buf), &buf, &buflen);
            break;
          }

      default:
            comment = "unknown RR type";
            goto hexify;
      }
      return (buf - obuf);
 formerr:
      comment = "RR format error";
 hexify: {
      int n, m;
      char *p;

      len = SPRINTF((tmp, "\\#(\t\t; %s", comment));
      T(addstr(tmp, len, &buf, &buflen));
      while (rdata < edata) {
            p = tmp;
            p += SPRINTF((p, "\n\t"));
            spaced = 0;
            n = MIN(16, edata - rdata);
            for (m = 0; m < n; m++)
                  p += SPRINTF((p, "%02x ", rdata[m]));
            T(addstr(tmp, p - tmp, &buf, &buflen));
            if (n < 16) {
                  T(addstr(")", 1, &buf, &buflen));
                  T(addtab(p - tmp + 1, 48, spaced, &buf, &buflen));
            }
            p = tmp;
            p += SPRINTF((p, "; "));
            for (m = 0; m < n; m++)
                  *p++ = (isascii(rdata[m]) && isprint(rdata[m]))
                        ? rdata[m]
                        : '.';
            T(addstr(tmp, p - tmp, &buf, &buflen));
            rdata += n;
      }
      return (buf - obuf);
    }
}

/* Private. */

/*
 * size_t
 * prune_origin(name, origin)
 *    Find out if the name is at or under the current origin.
 * return:
 *    Number of characters in name before start of origin,
 *    or length of name if origin does not match.
 * notes:
 *    This function should share code with samedomain().
 */
static size_t
prune_origin(const char *name, const char *origin) {
      const char *oname = name;

      while (*name != '\0') {
            if (origin != NULL && ns_samename(name, origin) == 1)
                  return (name - oname - (name > oname));
            while (*name != '\0') {
                  if (*name == '\\') {
                        name++;
                        /* XXX need to handle \nnn form. */
                        if (*name == '\0')
                              break;
                  } else if (*name == '.') {
                        name++;
                        break;
                  }
                  name++;
            }
      }
      return (name - oname);
}

/*
 * int
 * charstr(rdata, edata, buf, buflen)
 *    Format a <character-string> into the presentation buffer.
 * return:
 *    Number of rdata octets consumed
 *    0 for protocol format error
 *    -1 for output buffer error
 * side effects:
 *    buffer is advanced on success.
 */
static int
charstr(const u_char *rdata, const u_char *edata, char **buf, size_t *buflen) {
      const u_char *odata = rdata;
      size_t save_buflen = *buflen;
      char *save_buf = *buf;

      if (addstr("\"", 1, buf, buflen) < 0)
            goto enospc;
      if (rdata < edata) {
            int n = *rdata;

            if (rdata + 1 + n <= edata) {
                  rdata++;
                  while (n-- > 0) {
                        if (strchr("\n\"\\", *rdata) != NULL)
                              if (addstr("\\", 1, buf, buflen) < 0)
                                    goto enospc;
                        if (addstr((const char *)rdata, 1,
                                 buf, buflen) < 0)
                              goto enospc;
                        rdata++;
                  }
            }
      }
      if (addstr("\"", 1, buf, buflen) < 0)
            goto enospc;
      return (rdata - odata);
 enospc:
      __set_errno (ENOSPC);
      *buf = save_buf;
      *buflen = save_buflen;
      return (-1);
}

static int
addname(const u_char *msg, size_t msglen,
      const u_char **pp, const char *origin,
      char **buf, size_t *buflen)
{
      size_t newlen, save_buflen = *buflen;
      char *save_buf = *buf;
      int n;

      n = dn_expand(msg, msg + msglen, *pp, *buf, *buflen);
      if (n < 0)
            goto enospc;      /* Guess. */
      newlen = prune_origin(*buf, origin);
      if (newlen == 0) {
            /* Use "@" instead of name. */
            if (newlen + 2 > *buflen)
                  goto enospc;        /* No room for "@\0". */
            (*buf)[newlen++] = '@';
            (*buf)[newlen] = '\0';
      } else {
            if (((origin == NULL || origin[0] == '\0') ||
                (origin[0] != '.' && origin[1] != '\0' &&
                (*buf)[newlen] == '\0')) && (*buf)[newlen - 1] != '.') {
                  /* No trailing dot. */
                  if (newlen + 2 > *buflen)
                        goto enospc;      /* No room for ".\0". */
                  (*buf)[newlen++] = '.';
                  (*buf)[newlen] = '\0';
            }
      }
      *pp += n;
      addlen(newlen, buf, buflen);
      **buf = '\0';
      return (newlen);
 enospc:
      __set_errno (ENOSPC);
      *buf = save_buf;
      *buflen = save_buflen;
      return (-1);
}

static void
addlen(size_t len, char **buf, size_t *buflen) {
      assert(len <= *buflen);
      *buf += len;
      *buflen -= len;
}

static int
addstr(const char *src, size_t len, char **buf, size_t *buflen) {
      if (len >= *buflen) {
            __set_errno (ENOSPC);
            return (-1);
      }
      memcpy(*buf, src, len);
      addlen(len, buf, buflen);
      **buf = '\0';
      return (0);
}

static int
addtab(size_t len, size_t target, int spaced, char **buf, size_t *buflen) {
      size_t save_buflen = *buflen;
      char *save_buf = *buf;
      int t;

      if (spaced || len >= target - 1) {
            T(addstr("  ", 2, buf, buflen));
            spaced = 1;
      } else {
            for (t = (target - len - 1) / 8; t >= 0; t--)
                  if (addstr("\t", 1, buf, buflen) < 0) {
                        *buflen = save_buflen;
                        *buf = save_buf;
                        return (-1);
                  }
            spaced = 0;
      }
      return (spaced);
}

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