text: /* ====================================================================
   * Copyright (c) 2015 The OpenSSL Project.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. All advertising materials mentioning features or use of this
   *    software must display the following acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    licensing@OpenSSL.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   * ====================================================================
   */
  
  /* #define COMPILE_STANDALONE_TEST_DRIVER  */
  #include "apps.h"
  #include <string.h>
  #if !defined(OPENSSL_SYS_MSDOS)
  # include OPENSSL_UNISTD
  #endif
  
  #include <stdlib.h>
  #include <errno.h>
  #include <ctype.h>
  #include <limits.h>
  #include <openssl/bio.h>
  
  #define MAX_OPT_HELP_WIDTH 30
  const char OPT_HELP_STR[] = "--";
  const char OPT_MORE_STR[] = "---";
  
  /* Our state */
  static char **argv;
  static int argc;
  static int opt_index;
  static char *arg;
  static char *flag;
  static char *dunno;
  static const OPTIONS *unknown;
  static const OPTIONS *opts;
  static char prog[40];
  
  /*
   * Return the simple name of the program; removing various platform gunk.
   */
  #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_NETWARE)
  char *opt_progname(const char *argv0)
  {
      size_t i, n;
      const char *p;
      char *q;
  
      /* find the last '/', '\' or ':' */
      for (p = argv0 + strlen(argv0); --p > argv0;)
          if (*p == '/' || *p == '\\' || *p == ':') {
              p++;
              break;
          }
  
      /* Strip off trailing nonsense. */
      n = strlen(p);
      if (n > 4 &&
          (strcmp(&p[n - 4], ".exe") == 0 || strcmp(&p[n - 4], ".EXE") == 0))
          n -= 4;
  #if defined(OPENSSL_SYS_NETWARE)
      if (n > 4 &&
          (strcmp(&p[n - 4], ".nlm") == 0 || strcmp(&p[n - 4], ".NLM") == 0))
          n -= 4;
  #endif
  
      /* Copy over the name, in lowercase. */
      if (n > sizeof prog - 1)
          n = sizeof prog - 1;
      for (q = prog, i = 0; i < n; i++, p++)
          *q++ = isupper(*p) ? tolower(*p) : *p;
      *q = '\0';
      return prog;
  }
  
  #elif defined(OPENSSL_SYS_VMS)
  
  char *opt_progname(const char *argv0)
  {
      const char *p, *q;
  
      /* Find last special charcter sys:[foo.bar]openssl */
      for (p = argv0 + strlen(argv0); --p > argv0;)
          if (*p == ':' || *p == ']' || *p == '>') {
              p++;
              break;
          }
  
      q = strrchr(p, '.');
      strncpy(prog, p, sizeof prog - 1);
      prog[sizeof prog - 1] = '\0';
      if (q != NULL && q - p < sizeof prog)
          prog[q - p] = '\0';
      return prog;
  }
  
  #else
  
  char *opt_progname(const char *argv0)
  {
      const char *p;
  
      /* Could use strchr, but this is like the ones above. */
      for (p = argv0 + strlen(argv0); --p > argv0;)
          if (*p == '/') {
              p++;
              break;
          }
      strncpy(prog, p, sizeof prog - 1);
      prog[sizeof prog - 1] = '\0';
      return prog;
  }
  #endif
  
  char *opt_getprog(void)
  {
      return prog;
  }
  
  /* Set up the arg parsing. */
  char *opt_init(int ac, char **av, const OPTIONS *o)
  {
      /* Store state. */
      argc = ac;
      argv = av;
      opt_index = 1;
      opts = o;
      opt_progname(av[0]);
      unknown = NULL;
  
      for (; o->name; ++o) {
          const OPTIONS *next;
  #ifndef NDEBUG
          int duplicated, i;
  #endif
  
          if (o->name == OPT_HELP_STR || o->name == OPT_MORE_STR)
              continue;
  #ifndef NDEBUG
          i = o->valtype;
  
          /* Make sure options are legit. */
          assert(o->name[0] != '-');
          assert(o->retval > 0);
          switch (i) {
          case   0: case '-': case '/': case '<': case '>': case 'E': case 'F':
          case 'M': case 'U': case 'f': case 'l': case 'n': case 'p': case 's':
          case 'u':
              break;
          default:
              assert(0);
          }
  
          /* Make sure there are no duplicates. */
          for (next = o + 1; next->name; ++next) {
              /*
               * Some compilers inline strcmp and the assert string is too long.
               */
              duplicated = strcmp(o->name, next->name) == 0;
              assert(!duplicated);
          }
  #endif
          if (o->name[0] == '\0') {
              assert(unknown == NULL);
              unknown = o;
              assert(unknown->valtype == 0 || unknown->valtype == '-');
          }
      }
      return prog;
  }
  
  static OPT_PAIR formats[] = {
      {"PEM/DER", OPT_FMT_PEMDER},
      {"pkcs12", OPT_FMT_PKCS12},
      {"smime", OPT_FMT_SMIME},
      {"engine", OPT_FMT_ENGINE},
      {"msblob", OPT_FMT_MSBLOB},
      {"netscape", OPT_FMT_NETSCAPE},
      {"nss", OPT_FMT_NSS},
      {"text", OPT_FMT_TEXT},
      {"http", OPT_FMT_HTTP},
      {"pvk", OPT_FMT_PVK},
      {NULL}
  };
  
  /* Print an error message about a failed format parse. */
  int opt_format_error(const char *s, unsigned long flags)
  {
      OPT_PAIR *ap;
  
      if (flags == OPT_FMT_PEMDER)
          BIO_printf(bio_err, "%s: Bad format \"%s\"; must be pem or der\n",
                     prog, s);
      else {
          BIO_printf(bio_err, "%s: Bad format \"%s\"; must be one of:\n",
                     prog, s);
          for (ap = formats; ap->name; ap++)
              if (flags & ap->retval)
                  BIO_printf(bio_err, "   %s\n", ap->name);
      }
      return 0;
  }
  
  /* Parse a format string, put it into *result; return 0 on failure, else 1. */
  int opt_format(const char *s, unsigned long flags, int *result)
  {
      switch (*s) {
      default:
          return 0;
      case 'D':
      case 'd':
          if ((flags & OPT_FMT_PEMDER) == 0)
              return opt_format_error(s, flags);
          *result = FORMAT_ASN1;
          break;
      case 'T':
      case 't':
          if ((flags & OPT_FMT_TEXT) == 0)
              return opt_format_error(s, flags);
          *result = FORMAT_TEXT;
          break;
      case 'N':
      case 'n':
          if ((flags & OPT_FMT_NSS) == 0)
              return opt_format_error(s, flags);
          if (strcmp(s, "NSS") != 0 && strcmp(s, "nss") != 0)
              return opt_format_error(s, flags);
          *result = FORMAT_NSS;
          break;
      case 'S':
      case 's':
          if ((flags & OPT_FMT_SMIME) == 0)
              return opt_format_error(s, flags);
          *result = FORMAT_SMIME;
          break;
      case 'M':
      case 'm':
          if ((flags & OPT_FMT_MSBLOB) == 0)
              return opt_format_error(s, flags);
          *result = FORMAT_MSBLOB;
          break;
      case 'E':
      case 'e':
          if ((flags & OPT_FMT_ENGINE) == 0)
              return opt_format_error(s, flags);
          *result = FORMAT_ENGINE;
          break;
      case 'H':
      case 'h':
          if ((flags & OPT_FMT_HTTP) == 0)
              return opt_format_error(s, flags);
          *result = FORMAT_HTTP;
          break;
      case '1':
          if ((flags & OPT_FMT_PKCS12) == 0)
              return opt_format_error(s, flags);
          *result = FORMAT_PKCS12;
          break;
      case 'P':
      case 'p':
          if (s[1] == '\0' || strcmp(s, "PEM") == 0 || strcmp(s, "pem") == 0) {
              if ((flags & OPT_FMT_PEMDER) == 0)
                  return opt_format_error(s, flags);
              *result = FORMAT_PEM;
          } else if (strcmp(s, "PVK") == 0 || strcmp(s, "pvk") == 0) {
              if ((flags & OPT_FMT_PVK) == 0)
                  return opt_format_error(s, flags);
              *result = FORMAT_PVK;
          } else if (strcmp(s, "P12") == 0 || strcmp(s, "p12") == 0
                     || strcmp(s, "PKCS12") == 0 || strcmp(s, "pkcs12") == 0) {
              if ((flags & OPT_FMT_PKCS12) == 0)
                  return opt_format_error(s, flags);
              *result = FORMAT_PKCS12;
          } else
              return 0;
          break;
      }
      return 1;
  }
  
  /* Parse a cipher name, put it in *EVP_CIPHER; return 0 on failure, else 1. */
  int opt_cipher(const char *name, const EVP_CIPHER **cipherp)
  {
      *cipherp = EVP_get_cipherbyname(name);
      if (*cipherp)
          return 1;
      BIO_printf(bio_err, "%s: Unknown cipher %s\n", prog, name);
      return 0;
  }
  
  /*
   * Parse message digest name, put it in *EVP_MD; return 0 on failure, else 1.
   */
  int opt_md(const char *name, const EVP_MD **mdp)
  {
      *mdp = EVP_get_digestbyname(name);
      if (*mdp)
          return 1;
      BIO_printf(bio_err, "%s: Unknown digest %s\n", prog, name);
      return 0;
  }
  
  /* Look through a list of name/value pairs. */
  int opt_pair(const char *name, const OPT_PAIR* pairs, int *result)
  {
      const OPT_PAIR *pp;
  
      for (pp = pairs; pp->name; pp++)
          if (strcmp(pp->name, name) == 0) {
              *result = pp->retval;
              return 1;
          }
      BIO_printf(bio_err, "%s: Value must be one of:\n", prog);
      for (pp = pairs; pp->name; pp++)
          BIO_printf(bio_err, "\t%s\n", pp->name);
      return 0;
  }
  
  /* Parse an int, put it into *result; return 0 on failure, else 1. */
  int opt_int(const char *value, int *result)
  {
      long l;
  
      if (!opt_long(value, &l))
          return 0;
      *result = (int)l;
      if (*result != l) {
          BIO_printf(bio_err, "%s: Value \"%s\" outside integer range\n",
                     prog, value);
          return 0;
      }
      return 1;
  }
  
  /* Parse a long, put it into *result; return 0 on failure, else 1. */
  int opt_long(const char *value, long *result)
  {
      int oerrno = errno;
      long l;
      char *endp;
  
      l = strtol(value, &endp, 0);
      if (*endp
              || endp == value
              || ((l == LONG_MAX || l == LONG_MIN) && errno == ERANGE)
              || (l == 0 && errno != 0)) {
          BIO_printf(bio_err, "%s: Can't parse \"%s\" as a number\n",
                     prog, value);
          errno = oerrno;
          return 0;
      }
      *result = l;
      errno = oerrno;
      return 1;
  }
  
  #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L && \
      defined(INTMAX_MAX) && defined(UINTMAX_MAX)
  
  /* Parse an intmax_t, put it into *result; return 0 on failure, else 1. */
  int opt_imax(const char *value, intmax_t *result)
  {
      int oerrno = errno;
      intmax_t m;
      char *endp;
  
      m = strtoimax(value, &endp, 0);
      if (*endp
              || endp == value
              || ((m == INTMAX_MAX || m == INTMAX_MIN) && errno == ERANGE)
              || (m == 0 && errno != 0)) {
          BIO_printf(bio_err, "%s: Can't parse \"%s\" as a number\n",
                     prog, value);
          errno = oerrno;
          return 0;
      }
      *result = m;
      errno = oerrno;
      return 1;
  }
  
  /* Parse a uintmax_t, put it into *result; return 0 on failure, else 1. */
  int opt_umax(const char *value, uintmax_t *result)
  {
      int oerrno = errno;
      uintmax_t m;
      char *endp;
  
      m = strtoumax(value, &endp, 0);
      if (*endp
              || endp == value
              || (m == UINTMAX_MAX && errno == ERANGE)
              || (m == 0 && errno != 0)) {
          BIO_printf(bio_err, "%s: Can't parse \"%s\" as a number\n",
                     prog, value);
          errno = oerrno;
          return 0;
      }
      *result = m;
      errno = oerrno;
      return 1;
  }
  #endif
  
  /*
   * Parse an unsigned long, put it into *result; return 0 on failure, else 1.
   */
  int opt_ulong(const char *value, unsigned long *result)
  {
      int oerrno = errno;
      char *endptr;
      unsigned long l;
  
      l = strtoul(value, &endptr, 0);
      if (*endptr
              || endptr == value
              || ((l == ULONG_MAX) && errno == ERANGE)
              || (l == 0 && errno != 0)) {
          BIO_printf(bio_err, "%s: Can't parse \"%s\" as an unsigned number\n",
                     prog, value);
          errno = oerrno;
          return 0;
      }
      *result = l;
      errno = oerrno;
      return 1;
  }
  
  /*
   * We pass opt as an int but cast it to "enum range" so that all the
   * items in the OPT_V_ENUM enumeration are caught; this makes -Wswitch
   * in gcc do the right thing.
   */
  enum range { OPT_V_ENUM };
  
  int opt_verify(int opt, X509_VERIFY_PARAM *vpm)
  {
      int i;
      ossl_intmax_t t = 0;
      ASN1_OBJECT *otmp;
      X509_PURPOSE *xptmp;
      const X509_VERIFY_PARAM *vtmp;
  
      assert(vpm != NULL);
      assert(opt > OPT_V__FIRST);
      assert(opt < OPT_V__LAST);
  
      switch ((enum range)opt) {
      case OPT_V__FIRST:
      case OPT_V__LAST:
          return 0;
      case OPT_V_POLICY:
          otmp = OBJ_txt2obj(opt_arg(), 0);
          if (otmp == NULL) {
              BIO_printf(bio_err, "%s: Invalid Policy %s\n", prog, opt_arg());
              return 0;
          }
          X509_VERIFY_PARAM_add0_policy(vpm, otmp);
          break;
      case OPT_V_PURPOSE:
          /* purpose name -> purpose index */
          i = X509_PURPOSE_get_by_sname(opt_arg());
          if (i < 0) {
              BIO_printf(bio_err, "%s: Invalid purpose %s\n", prog, opt_arg());
              return 0;
          }
  
          /* purpose index -> purpose object */
          xptmp = X509_PURPOSE_get0(i);
  
          /* purpose object -> purpose value */
          i = X509_PURPOSE_get_id(xptmp);
  
          if (!X509_VERIFY_PARAM_set_purpose(vpm, i)) {
              BIO_printf(bio_err,
                         "%s: Internal error setting purpose %s\n",
                         prog, opt_arg());
              return 0;
          }
          break;
      case OPT_V_VERIFY_NAME:
          vtmp = X509_VERIFY_PARAM_lookup(opt_arg());
          if (vtmp == NULL) {
              BIO_printf(bio_err, "%s: Invalid verify name %s\n",
                         prog, opt_arg());
              return 0;
          }
          X509_VERIFY_PARAM_set1(vpm, vtmp);
          break;
      case OPT_V_VERIFY_DEPTH:
          i = atoi(opt_arg());
          if (i >= 0)
              X509_VERIFY_PARAM_set_depth(vpm, i);
          break;
      case OPT_V_ATTIME:
          if (!opt_imax(opt_arg(), &t))
              return 0;
          if (t != (time_t)t) {
              BIO_printf(bio_err, "%s: epoch time out of range %s\n",
                         prog, opt_arg());
              return 0;
          }
          X509_VERIFY_PARAM_set_time(vpm, (time_t)t);
          break;
      case OPT_V_VERIFY_HOSTNAME:
          if (!X509_VERIFY_PARAM_set1_host(vpm, opt_arg(), 0))
              return 0;
          break;
      case OPT_V_VERIFY_EMAIL:
          if (!X509_VERIFY_PARAM_set1_email(vpm, opt_arg(), 0))
              return 0;
          break;
      case OPT_V_VERIFY_IP:
          if (!X509_VERIFY_PARAM_set1_ip_asc(vpm, opt_arg()))
              return 0;
          break;
      case OPT_V_IGNORE_CRITICAL:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_IGNORE_CRITICAL);
          break;
      case OPT_V_ISSUER_CHECKS:
          /* NOP, deprecated */
          break;
      case OPT_V_CRL_CHECK:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_CRL_CHECK);
          break;
      case OPT_V_CRL_CHECK_ALL:
          X509_VERIFY_PARAM_set_flags(vpm,
                                      X509_V_FLAG_CRL_CHECK |
                                      X509_V_FLAG_CRL_CHECK_ALL);
          break;
      case OPT_V_POLICY_CHECK:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_POLICY_CHECK);
          break;
      case OPT_V_EXPLICIT_POLICY:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_EXPLICIT_POLICY);
          break;
      case OPT_V_INHIBIT_ANY:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_INHIBIT_ANY);
          break;
      case OPT_V_INHIBIT_MAP:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_INHIBIT_MAP);
          break;
      case OPT_V_X509_STRICT:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_X509_STRICT);
          break;
      case OPT_V_EXTENDED_CRL:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_EXTENDED_CRL_SUPPORT);
          break;
      case OPT_V_USE_DELTAS:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_USE_DELTAS);
          break;
      case OPT_V_POLICY_PRINT:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NOTIFY_POLICY);
          break;
      case OPT_V_CHECK_SS_SIG:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_CHECK_SS_SIGNATURE);
          break;
      case OPT_V_TRUSTED_FIRST:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_TRUSTED_FIRST);
          break;
      case OPT_V_SUITEB_128_ONLY:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_128_LOS_ONLY);
          break;
      case OPT_V_SUITEB_128:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_128_LOS);
          break;
      case OPT_V_SUITEB_192:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_192_LOS);
          break;
      case OPT_V_PARTIAL_CHAIN:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_PARTIAL_CHAIN);
          break;
      case OPT_V_NO_ALT_CHAINS:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NO_ALT_CHAINS);
  	break;
      case OPT_V_NO_CHECK_TIME:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NO_CHECK_TIME);
  	break;
      }
      return 1;
  
  }
  
  /*
   * Parse the next flag (and value if specified), return 0 if done, -1 on
   * error, otherwise the flag's retval.
   */
  int opt_next(void)
  {
      char *p;
      const OPTIONS *o;
      int ival;
      long lval;
      unsigned long ulval;
      ossl_intmax_t imval;
      ossl_uintmax_t umval;
  
      /* Look at current arg; at end of the list? */
      arg = NULL;
      p = argv[opt_index];
      if (p == NULL)
          return 0;
  
      /* If word doesn't start with a -, we're done. */
      if (*p != '-')
          return 0;
  
      /* Hit "--" ? We're done. */
      opt_index++;
      if (strcmp(p, "--") == 0)
          return 0;
  
      /* Allow -nnn and --nnn */
      if (*++p == '-')
          p++;
      flag = p - 1;
  
      /* If we have --flag=foo, snip it off */
      if ((arg = strchr(p, '=')) != NULL)
          *arg++ = '\0';
      for (o = opts; o->name; ++o) {
          /* If not this option, move on to the next one. */
          if (strcmp(p, o->name) != 0)
              continue;
  
          /* If it doesn't take a value, make sure none was given. */
          if (o->valtype == 0 || o->valtype == '-') {
              if (arg) {
                  BIO_printf(bio_err,
                             "%s: Option -%s does not take a value\n", prog, p);
                  return -1;
              }
              return o->retval;
          }
  
          /* Want a value; get the next param if =foo not used. */
          if (arg == NULL) {
              if (argv[opt_index] == NULL) {
                  BIO_printf(bio_err,
                             "%s: Option -%s needs a value\n", prog, o->name);
                  return -1;
              }
              arg = argv[opt_index++];
          }
  
          /* Syntax-check value. */
          switch (o->valtype) {
          default:
          case 's':
              /* Just a string. */
              break;
          case '/':
              if (app_isdir(arg) >= 0)
                  break;
              BIO_printf(bio_err, "%s: Not a directory: %s\n", prog, arg);
              return -1;
          case '<':
              /* Input file. */
              if (strcmp(arg, "-") == 0 || app_access(arg, R_OK) >= 0)
                  break;
              BIO_printf(bio_err,
                         "%s: Cannot open input file %s, %s\n",
                         prog, arg, strerror(errno));
              return -1;
          case '>':
              /* Output file. */
              if (strcmp(arg, "-") == 0 || app_access(arg, W_OK) >= 0 || errno == ENOENT)
                  break;
              BIO_printf(bio_err,
                         "%s: Cannot open output file %s, %s\n",
                         prog, arg, strerror(errno));
              return -1;
          case 'p':
          case 'n':
              if (!opt_int(arg, &ival)
                      || (o->valtype == 'p' && ival <= 0)) {
                  BIO_printf(bio_err,
                             "%s: Non-positive number \"%s\" for -%s\n",
                             prog, arg, o->name);
                  return -1;
              }
              break;
          case 'M':
              if (!opt_imax(arg, &imval)) {
                  BIO_printf(bio_err,
                             "%s: Invalid number \"%s\" for -%s\n",
                             prog, arg, o->name);
                  return -1;
              }
              break;
          case 'U':
              if (!opt_umax(arg, &umval)) {
                  BIO_printf(bio_err,
                             "%s: Invalid number \"%s\" for -%s\n",
                             prog, arg, o->name);
                  return -1;
              }
              break;
          case 'l':
              if (!opt_long(arg, &lval)) {
                  BIO_printf(bio_err,
                             "%s: Invalid number \"%s\" for -%s\n",
                             prog, arg, o->name);
                  return -1;
              }
              break;
          case 'u':
              if (!opt_ulong(arg, &ulval)) {
                  BIO_printf(bio_err,
                             "%s: Invalid number \"%s\" for -%s\n",
                             prog, arg, o->name);
                  return -1;
              }
              break;
          case 'E':
          case 'F':
          case 'f':
              if (opt_format(arg,
                             o->valtype == 'E' ? OPT_FMT_PDE :
                             o->valtype == 'F' ? OPT_FMT_PEMDER
                             : OPT_FMT_ANY, &ival))
                  break;
              BIO_printf(bio_err,
                         "%s: Invalid format \"%s\" for -%s\n",
                         prog, arg, o->name);
              return -1;
          }
  
          /* Return the flag value. */
          return o->retval;
      }
      if (unknown != NULL) {
          dunno = p;
          return unknown->retval;
      }
      BIO_printf(bio_err, "%s: Option unknown option -%s\n", prog, p);
      return -1;
  }
  
  /* Return the most recent flag parameter. */
  char *opt_arg(void)
  {
      return arg;
  }
  
  /* Return the most recent flag. */
  char *opt_flag(void)
  {
      return flag;
  }
  
  /* Return the unknown option. */
  char *opt_unknown(void)
  {
      return dunno;
  }
  
  /* Return the rest of the arguments after parsing flags. */
  char **opt_rest(void)
  {
      return &argv[opt_index];
  }
  
  /* How many items in remaining args? */
  int opt_num_rest(void)
  {
      int i = 0;
      char **pp;
  
      for (pp = opt_rest(); *pp; pp++, i++)
          continue;
      return i;
  }
  
  /* Return a string describing the parameter type. */
  static const char *valtype2param(const OPTIONS *o)
  {
      switch (o->valtype) {
      case 0:
      case '-':
          return "";
      case 's':
          return "val";
      case '/':
          return "dir";
      case '<':
          return "infile";
      case '>':
          return "outfile";
      case 'p':
          return "+int";
      case 'n':
          return "int";
      case 'l':
          return "long";
      case 'u':
          return "ulong";
      case 'E':
          return "PEM|DER|ENGINE";
      case 'F':
          return "PEM|DER";
      case 'f':
          return "format";
      case 'M':
          return "intmax";
      case 'U':
          return "uintmax";
      }
      return "parm";
  }
  
  void opt_help(const OPTIONS *list)
  {
      const OPTIONS *o;
      int i;
      int standard_prolog;
      int width = 5;
      char start[80 + 1];
      char *p;
      const char *help;
  
      /* Starts with its own help message? */
      standard_prolog = list[0].name != OPT_HELP_STR;
  
      /* Find the widest help. */
      for (o = list; o->name; o++) {
          if (o->name == OPT_MORE_STR)
              continue;
          i = 2 + (int)strlen(o->name);
          if (o->valtype != '-')
              i += 1 + strlen(valtype2param(o));
          if (i < MAX_OPT_HELP_WIDTH && i > width)
              width = i;
          assert(i < (int)sizeof start);
      }
  
      if (standard_prolog)
          BIO_printf(bio_err, "Usage: %s [options]\nValid options are:\n",
                     prog);
  
      /* Now let's print. */
      for (o = list; o->name; o++) {
          help = o->helpstr ? o->helpstr : "(No additional info)";
          if (o->name == OPT_HELP_STR) {
              BIO_printf(bio_err, help, prog);
              continue;
          }
  
          /* Pad out prefix */
          memset(start, ' ', sizeof(start) - 1);
          start[sizeof start - 1] = '\0';
  
          if (o->name == OPT_MORE_STR) {
              /* Continuation of previous line; padd and print. */
              start[width] = '\0';
              BIO_printf(bio_err, "%s  %s\n", start, help);
              continue;
          }
  
          /* Build up the "-flag [param]" part. */
          p = start;
          *p++ = ' ';
          *p++ = '-';
          if (o->name[0])
              p += strlen(strcpy(p, o->name));
          else
              *p++ = '*';
          if (o->valtype != '-') {
              *p++ = ' ';
              p += strlen(strcpy(p, valtype2param(o)));
          }
          *p = ' ';
          if ((int)(p - start) >= MAX_OPT_HELP_WIDTH) {
              *p = '\0';
              BIO_printf(bio_err, "%s\n", start);
              memset(start, ' ', sizeof(start));
          }
          start[width] = '\0';
          BIO_printf(bio_err, "%s  %s\n", start, help);
      }
  }
  
  #ifdef COMPILE_STANDALONE_TEST_DRIVER
  # include <sys/stat.h>
  
  typedef enum OPTION_choice {
      OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
      OPT_IN, OPT_INFORM, OPT_OUT, OPT_COUNT, OPT_U, OPT_FLAG,
      OPT_STR, OPT_NOTUSED
  } OPTION_CHOICE;
  
  static OPTIONS options[] = {
      {OPT_HELP_STR, 1, '-', "Usage: %s flags\n"},
      {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
      {"help", OPT_HELP, '-', "Display this summary"},
      {"in", OPT_IN, '<', "input file"},
      {OPT_MORE_STR, 1, '-', "more detail about input"},
      {"inform", OPT_INFORM, 'f', "input file format; defaults to pem"},
      {"out", OPT_OUT, '>', "output file"},
      {"count", OPT_COUNT, 'p', "a counter greater than zero"},
      {"u", OPT_U, 'u', "an unsigned number"},
      {"flag", OPT_FLAG, 0, "just some flag"},
      {"str", OPT_STR, 's', "the magic word"},
      {"areallyverylongoption", OPT_HELP, '-', "long way for help"},
      {NULL}
  };
  
  BIO *bio_err;
  
  int app_isdir(const char *name)
  {
      struct stat sb;
  
      return name != NULL && stat(name, &sb) >= 0 && S_ISDIR(sb.st_mode);
  }
  
  int main(int ac, char **av)
  {
      OPTION_CHOICE o;
      char **rest;
      char *prog;
  
      bio_err = BIO_new_fp(stderr, BIO_NOCLOSE | BIO_FP_TEXT);
  
      prog = opt_init(ac, av, options);
      while ((o = opt_next()) != OPT_EOF) {
          switch (c) {
          case OPT_NOTUSED:
          case OPT_EOF:
          case OPT_ERR:
              printf("%s: Usage error; try -help.\n", prog);
              return 1;
          case OPT_HELP:
              opt_help(options);
              return 0;
          case OPT_IN:
              printf("in %s\n", opt_arg());
              break;
          case OPT_INFORM:
              printf("inform %s\n", opt_arg());
              break;
          case OPT_OUT:
              printf("out %s\n", opt_arg());
              break;
          case OPT_COUNT:
              printf("count %s\n", opt_arg());
              break;
          case OPT_U:
              printf("u %s\n", opt_arg());
              break;
          case OPT_FLAG:
              printf("flag\n");
              break;
          case OPT_STR:
              printf("str %s\n", opt_arg());
              break;
          }
      }
      argc = opt_num_rest();
      argv = opt_rest();
  
      printf("args = %d\n", argc);
      if (argc)
          while (*argv)
              printf("  %s\n", *argv++);
      return 0;
  }
  #endif
  