text: /*
   * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  /*
   * This file is also used by the test suite. Do not #include "apps.h".
   */
  #include "opt.h"
  #include "fmt.h"
  #include "internal/nelem.h"
  #include <string.h>
  #if !defined(OPENSSL_SYS_MSDOS)
  # include <unistd.h>
  #endif
  
  #include <stdlib.h>
  #include <errno.h>
  #include <ctype.h>
  #include <limits.h>
  #include <openssl/bio.h>
  #include <openssl/x509v3.h>
  
  #define MAX_OPT_HELP_WIDTH 30
  const char OPT_HELP_STR[] = "--";
  const char OPT_MORE_STR[] = "---";
  const char OPT_SECTION_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)
  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;
  
      /* 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++ = tolower((unsigned char)*p);
      *q = '\0';
      return prog;
  }
  
  #elif defined(OPENSSL_SYS_VMS)
  
  char *opt_progname(const char *argv0)
  {
      const char *p, *q;
  
      /* Find last special character 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_begin();
      opts = o;
      opt_progname(av[0]);
      unknown = NULL;
  
      for (; o->name; ++o) {
  #ifndef NDEBUG
          const OPTIONS *next;
          int duplicated, i;
  #endif
  
          if (o->name == OPT_HELP_STR || o->name == OPT_MORE_STR ||
              o->name == OPT_SECTION_STR)
              continue;
  #ifndef NDEBUG
          i = o->valtype;
  
          /* Make sure options are legit. */
          OPENSSL_assert(o->name[0] != '-');
          OPENSSL_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': case 'c':
              break;
          default:
              OPENSSL_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;
              OPENSSL_assert(!duplicated);
          }
  #endif
          if (o->name[0] == '\0') {
              OPENSSL_assert(unknown == NULL);
              unknown = o;
              OPENSSL_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},
      {"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) {
          opt_printf_stderr("%s: Bad format \"%s\"; must be pem or der\n",
                            prog, s);
      } else {
          opt_printf_stderr("%s: Bad format \"%s\"; must be one of:\n",
                            prog, s);
          for (ap = formats; ap->name; ap++)
              if (flags & ap->retval)
                  opt_printf_stderr("   %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 != NULL)
          return 1;
      opt_printf_stderr("%s: Unrecognized flag %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 != NULL)
          return 1;
      opt_printf_stderr("%s: Unrecognized flag %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;
          }
      opt_printf_stderr("%s: Value must be one of:\n", prog);
      for (pp = pairs; pp->name; pp++)
          opt_printf_stderr("\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) {
          opt_printf_stderr("%s: Value \"%s\" outside integer range\n",
                            prog, value);
          return 0;
      }
      return 1;
  }
  
  static void opt_number_error(const char *v)
  {
      size_t i = 0;
      struct strstr_pair_st {
          char *prefix;
          char *name;
      } b[] = {
          {"0x", "a hexadecimal"},
          {"0X", "a hexadecimal"},
          {"0", "an octal"}
      };
  
      for (i = 0; i < OSSL_NELEM(b); i++) {
          if (strncmp(v, b[i].prefix, strlen(b[i].prefix)) == 0) {
              opt_printf_stderr("%s: Can't parse \"%s\" as %s number\n",
                                prog, v, b[i].name);
              return;
          }
      }
      opt_printf_stderr("%s: Can't parse \"%s\" as a number\n", prog, v);
      return;
  }
  
  /* 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;
  
      errno = 0;
      l = strtol(value, &endp, 0);
      if (*endp
              || endp == value
              || ((l == LONG_MAX || l == LONG_MIN) && errno == ERANGE)
              || (l == 0 && errno != 0)) {
          opt_number_error(value);
          errno = oerrno;
          return 0;
      }
      *result = l;
      errno = oerrno;
      return 1;
  }
  
  #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L && \
      defined(INTMAX_MAX) && defined(UINTMAX_MAX) && \
      !defined(OPENSSL_NO_INTTYPES_H)
  
  /* 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;
  
      errno = 0;
      m = strtoimax(value, &endp, 0);
      if (*endp
              || endp == value
              || ((m == INTMAX_MAX || m == INTMAX_MIN) && errno == ERANGE)
              || (m == 0 && errno != 0)) {
          opt_number_error(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;
  
      errno = 0;
      m = strtoumax(value, &endp, 0);
      if (*endp
              || endp == value
              || (m == UINTMAX_MAX && errno == ERANGE)
              || (m == 0 && errno != 0)) {
          opt_number_error(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;
  
      errno = 0;
      l = strtoul(value, &endptr, 0);
      if (*endptr
              || endptr == value
              || ((l == ULONG_MAX) && errno == ERANGE)
              || (l == 0 && errno != 0)) {
          opt_number_error(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;
  
      OPENSSL_assert(vpm != NULL);
      OPENSSL_assert(opt > OPT_V__FIRST);
      OPENSSL_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) {
              opt_printf_stderr("%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) {
              opt_printf_stderr("%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)) {
              opt_printf_stderr("%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) {
              opt_printf_stderr("%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_VERIFY_AUTH_LEVEL:
          i = atoi(opt_arg());
          if (i >= 0)
              X509_VERIFY_PARAM_set_auth_level(vpm, i);
          break;
      case OPT_V_ATTIME:
          if (!opt_imax(opt_arg(), &t))
              return 0;
          if (t != (time_t)t) {
              opt_printf_stderr("%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;
      case OPT_V_ALLOW_PROXY_CERTS:
          X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_ALLOW_PROXY_CERTS);
          break;
      }
      return 1;
  
  }
  
  void opt_begin(void)
  {
      opt_index = 1;
      arg = NULL;
      flag = NULL;
  }
  
  /*
   * 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) {
                  opt_printf_stderr("%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) {
                  opt_printf_stderr("%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 (opt_isdir(arg) > 0)
                  break;
              opt_printf_stderr("%s: Not a directory: %s\n", prog, arg);
              return -1;
          case '<':
              /* Input file. */
              break;
          case '>':
              /* Output file. */
              break;
          case 'p':
          case 'n':
              if (!opt_int(arg, &ival)
                      || (o->valtype == 'p' && ival <= 0)) {
                  opt_printf_stderr("%s: Non-positive number \"%s\" for -%s\n",
                                    prog, arg, o->name);
                  return -1;
              }
              break;
          case 'M':
              if (!opt_imax(arg, &imval)) {
                  opt_printf_stderr("%s: Invalid number \"%s\" for -%s\n",
                                    prog, arg, o->name);
                  return -1;
              }
              break;
          case 'U':
              if (!opt_umax(arg, &umval)) {
                  opt_printf_stderr("%s: Invalid number \"%s\" for -%s\n",
                                    prog, arg, o->name);
                  return -1;
              }
              break;
          case 'l':
              if (!opt_long(arg, &lval)) {
                  opt_printf_stderr("%s: Invalid number \"%s\" for -%s\n",
                                    prog, arg, o->name);
                  return -1;
              }
              break;
          case 'u':
              if (!opt_ulong(arg, &ulval)) {
                  opt_printf_stderr("%s: Invalid number \"%s\" for -%s\n",
                                    prog, arg, o->name);
                  return -1;
              }
              break;
          case 'c':
          case 'E':
          case 'F':
          case 'f':
              if (opt_format(arg,
                             o->valtype == 'c' ? OPT_FMT_PDS :
                             o->valtype == 'E' ? OPT_FMT_PDE :
                             o->valtype == 'F' ? OPT_FMT_PEMDER
                             : OPT_FMT_ANY, &ival))
                  break;
              opt_printf_stderr("%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;
      }
      opt_printf_stderr("%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_print(const OPTIONS *o, int width)
  {
      const char* help;
      char start[80 + 1];
      char *p;
  
          help = o->helpstr ? o->helpstr : "(No additional info)";
          if (o->name == OPT_HELP_STR || o->name == OPT_SECTION_STR) {
              opt_printf_stderr(help, prog);
              return;
          }
  
          /* Pad out prefix */
          memset(start, ' ', sizeof(start) - 1);
          start[sizeof(start) - 1] = '\0';
  
          if (o->name == OPT_MORE_STR) {
              /* Continuation of previous line; pad and print. */
              start[width] = '\0';
              opt_printf_stderr("%s  %s\n", start, help);
              return;
          }
  
          /* 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';
              opt_printf_stderr("%s\n", start);
              memset(start, ' ', sizeof(start));
          }
          start[width] = '\0';
          opt_printf_stderr("%s  %s\n", start, help);
  }
  
  void opt_help(const OPTIONS *list)
  {
      const OPTIONS *o;
      int i;
      int standard_prolog;
      int width = 5;
      char start[80 + 1];
  
      /* 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;
          OPENSSL_assert(i < (int)sizeof(start));
      }
  
      if (standard_prolog) {
          opt_printf_stderr("Usage: %s [options]\n", prog);
          if (list[0].name != OPT_SECTION_STR)
              opt_printf_stderr("Valid options are:\n", prog);
      }
  
      /* Now let's print. */
      for (o = list; o->name; o++) {
          opt_print(o, width);
      }
  }
  
  /* opt_isdir section */
  #ifdef _WIN32
  # include <windows.h>
  int opt_isdir(const char *name)
  {
      DWORD attr;
  # if defined(UNICODE) || defined(_UNICODE)
      size_t i, len_0 = strlen(name) + 1;
      WCHAR tempname[MAX_PATH];
  
      if (len_0 > MAX_PATH)
          return -1;
  
  #  if !defined(_WIN32_WCE) || _WIN32_WCE>=101
      if (!MultiByteToWideChar(CP_ACP, 0, name, len_0, tempname, MAX_PATH))
  #  endif
          for (i = 0; i < len_0; i++)
              tempname[i] = (WCHAR)name[i];
  
      attr = GetFileAttributes(tempname);
  # else
      attr = GetFileAttributes(name);
  # endif
      if (attr == INVALID_FILE_ATTRIBUTES)
          return -1;
      return ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0);
  }
  #else
  # include <sys/stat.h>
  # ifndef S_ISDIR
  #  if defined(_S_IFMT) && defined(_S_IFDIR)
  #   define S_ISDIR(a)   (((a) & _S_IFMT) == _S_IFDIR)
  #  else
  #   define S_ISDIR(a)   (((a) & S_IFMT) == S_IFDIR)
  #  endif
  # endif
  
  int opt_isdir(const char *name)
  {
  # if defined(S_ISDIR)
      struct stat st;
  
      if (stat(name, &st) == 0)
          return S_ISDIR(st.st_mode);
      else
          return -1;
  # else
      return -1;
  # endif
  }
  #endif
  