util.cc

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// -*- mode: c++; c-basic-offset:4 -*-
 
// This file is part of libdap, A C++ implementation of the OPeNDAP Data
// Access Protocol.
 
// Copyright (c) 2002,2003 OPeNDAP, Inc.
// Author: James Gallagher <jgallagher@opendap.org>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
 
// (c) COPYRIGHT URI/MIT 1994-1999
// Please read the full copyright statement in the file COPYRIGHT_URI.
//
// Authors:
//      jhrg,jimg       James Gallagher <jgallagher@gso.uri.edu>
 
// Utility functions used by the api.
//
// jhrg 9/21/94
 
#include "config.h"
 
#include <fstream>
 
#include <cassert>
#include <climits>
#include <cstdlib>
#include <cstring>
 
#include <ctype.h>
#ifndef TM_IN_SYS_TIME
#include <time.h>
#else
#include <sys/time.h>
#endif
 
#ifndef WIN32
#include <unistd.h> // for stat
#else
#include <fcntl.h>
#include <io.h>
#include <process.h>
#endif
 
#include <sys/stat.h>
#include <sys/types.h>
 
#include <algorithm>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
 
#include "Array.h"
#include "BaseType.h"
#include "Byte.h"
#include "Float32.h"
#include "Float64.h"
#include "Int16.h"
#include "Int32.h"
#include "Str.h"
#include "UInt16.h"
#include "UInt32.h"
 
#include "Int64.h"
#include "Int8.h"
#include "UInt64.h"
 
#include "Error.h"
 
#include "GNURegex.h"
#include "debug.h"
#include "util.h"
 
using namespace std;
 
namespace libdap {

bool is_host_big_endian() {
#ifdef COMPUTE_ENDIAN_AT_RUNTIME
 
    dods_int16 i = 0x0100;
    char *c = reinterpret_cast<char *>(&i);
    return *c;
 
#else
 
#if WORDS_BIGENDIAN
    return true;
#else
    return false;
#endif
 
#endif
}

string extract_string_argument(BaseType *arg) {
    assert(arg);
 
    if (arg->type() != dods_str_c)
        throw Error(malformed_expr, "The function requires a string argument.");
 
    if (!arg->read_p())
        throw InternalErr(__FILE__, __LINE__,
                          "The CE Evaluator built an argument list where some constants held no values.");
 
    return static_cast<Str *>(arg)->value();
}
 
template <class T> static void set_array_using_double_helper(Array *a, double *src, int src_len) {
    assert(a);
    assert(src);
    assert(src_len > 0);
 
    vector<T> values(src_len);
    for (int i = 0; i < src_len; ++i)
        values[i] = (T)src[i];
 
    // This copies the values
    a->set_value(values, src_len);
}

void set_array_using_double(Array *dest, double *src, int src_len) {
    assert(dest);
    assert(src);
    assert(src_len > 0);
 
    // Simple types are Byte, ..., Float64, String and Url.
    if ((dest->type() == dods_array_c && !dest->var()->is_simple_type()) || dest->var()->type() == dods_str_c ||
        dest->var()->type() == dods_url_c)
        throw InternalErr(__FILE__, __LINE__, "The function requires a numeric-type array argument.");
 
    // Test sizes. Note that Array::length() takes any constraint into account
    // when it returns the length. Even if this was removed, the 'helper'
    // function this uses calls Vector::val2buf() which uses Vector::width()
    // which in turn uses length().
    if (dest->length() != src_len)
        throw InternalErr(__FILE__, __LINE__,
                          "The source and destination array sizes don't match (" + long_to_string(src_len) +
                              " versus " + long_to_string(dest->length()) + ").");
 
    // The types of arguments that the CE Parser will build for numeric
    // constants are limited to Uint32, Int32 and Float64. See ce_expr.y.
    // Expanded to work for any numeric type so it can be used for more than
    // just arguments.
    switch (dest->var()->type()) {
    case dods_byte_c:
        set_array_using_double_helper<dods_byte>(dest, src, src_len);
        break;
    case dods_uint16_c:
        set_array_using_double_helper<dods_uint16>(dest, src, src_len);
        break;
    case dods_int16_c:
        set_array_using_double_helper<dods_int16>(dest, src, src_len);
        break;
    case dods_uint32_c:
        set_array_using_double_helper<dods_uint32>(dest, src, src_len);
        break;
    case dods_int32_c:
        set_array_using_double_helper<dods_int32>(dest, src, src_len);
        break;
    case dods_float32_c:
        set_array_using_double_helper<dods_float32>(dest, src, src_len);
        break;
    case dods_float64_c:
        set_array_using_double_helper<dods_float64>(dest, src, src_len);
        break;
 
        // DAP4 support
    case dods_uint8_c:
        set_array_using_double_helper<dods_byte>(dest, src, src_len);
        break;
    case dods_int8_c:
        set_array_using_double_helper<dods_int8>(dest, src, src_len);
        break;
    case dods_uint64_c:
        set_array_using_double_helper<dods_uint64>(dest, src, src_len);
        break;
    case dods_int64_c:
        set_array_using_double_helper<dods_int64>(dest, src, src_len);
        break;
    default:
        throw InternalErr(__FILE__, __LINE__,
                          "The argument list built by the CE parser contained an unsupported numeric type.");
    }
 
    // Set the read_p property.
    dest->set_read_p(true);
}
 
template <class T> static double *extract_double_array_helper(Array *a) {
    assert(a);
 
    int length = a->length();
 
    vector<T> b(length);
    a->value(b.data()); // Extract the values of 'a' to 'b'
 
    double *dest = new double[length];
    for (int i = 0; i < length; ++i)
        dest[i] = (double)b[i];
 
    return dest;
}

double *extract_double_array(Array *a) {
    assert(a);
 
    // Simple types are Byte, ..., Float64, String and Url.
    if ((a->type() == dods_array_c && !a->var()->is_simple_type()) || a->var()->type() == dods_str_c ||
        a->var()->type() == dods_url_c)
        throw Error(malformed_expr, "The function requires a DAP numeric-type array argument.");
 
    if (!a->read_p())
        throw InternalErr(__FILE__, __LINE__, string("The Array '") + a->name() + "'does not contain values.");
 
    // The types of arguments that the CE Parser will build for numeric
    // constants are limited to Uint32, Int32 and Float64. See ce_expr.y.
    // Expanded to work for any numeric type so it can be used for more than
    // just arguments.
    switch (a->var()->type()) {
    case dods_byte_c:
        return extract_double_array_helper<dods_byte>(a);
    case dods_uint16_c:
        return extract_double_array_helper<dods_uint16>(a);
    case dods_int16_c:
        return extract_double_array_helper<dods_int16>(a);
    case dods_uint32_c:
        return extract_double_array_helper<dods_uint32>(a);
    case dods_int32_c:
        return extract_double_array_helper<dods_int32>(a);
    case dods_float32_c:
        return extract_double_array_helper<dods_float32>(a);
    case dods_float64_c:
        // Should not be copying these values, just read them,
        // but older code may depend on the return of this function
        // being something that should be deleted, so leave this
        // alone. jhrg 2/24/15
        return extract_double_array_helper<dods_float64>(a);
 
        // Support for DAP4
    case dods_uint8_c:
        return extract_double_array_helper<dods_byte>(a);
    case dods_int8_c:
        return extract_double_array_helper<dods_int8>(a);
    case dods_uint64_c:
        return extract_double_array_helper<dods_uint64>(a);
    case dods_int64_c:
        return extract_double_array_helper<dods_int64>(a);
    default:
        throw InternalErr(__FILE__, __LINE__,
                          "The argument list built by the CE parser contained an unsupported numeric type.");
    }
}
 
// This helper function assumes 'dest' is the correct size. This should not
// be called when the Array 'a' is a Float64, since the values are already
// in a double array!
template <class T> static void extract_double_array_helper(Array *a, vector<double> &dest) {
    assert(a);
    assert(dest.size() == (unsigned long)a->length());
 
    int length = a->length();
 
    vector<T> b(length);
    a->value(b.data()); // Extract the values of 'a' to 'b'
 
    for (int i = 0; i < length; ++i)
        dest[i] = (double)b[i];
}

void extract_double_array(Array *a, vector<double> &dest) {
    assert(a);
 
    // Simple types are Byte, ..., Float64, String and Url.
    if ((a->type() == dods_array_c && !a->var()->is_simple_type()) || a->var()->type() == dods_str_c ||
        a->var()->type() == dods_url_c)
        throw Error(malformed_expr, "The function requires a DAP numeric-type array argument.");
 
    if (!a->read_p())
        throw InternalErr(__FILE__, __LINE__, string("The Array '") + a->name() + "' does not contain values.");
 
    dest.resize(a->length());
 
    // The types of arguments that the CE Parser will build for numeric
    // constants are limited to Uint32, Int32 and Float64. See ce_expr.y.
    // Expanded to work for any numeric type so it can be used for more than
    // just arguments.
    switch (a->var()->type()) {
    case dods_byte_c:
        return extract_double_array_helper<dods_byte>(a, dest);
    case dods_uint16_c:
        return extract_double_array_helper<dods_uint16>(a, dest);
    case dods_int16_c:
        return extract_double_array_helper<dods_int16>(a, dest);
    case dods_uint32_c:
        return extract_double_array_helper<dods_uint32>(a, dest);
    case dods_int32_c:
        return extract_double_array_helper<dods_int32>(a, dest);
    case dods_float32_c:
        return extract_double_array_helper<dods_float32>(a, dest);
    case dods_float64_c:
        return a->value(dest.data()); // no need to copy the values
        // return extract_double_array_helper<dods_float64>(a, dest);
 
        // Support for DAP4
    case dods_uint8_c:
        return extract_double_array_helper<dods_byte>(a, dest);
    case dods_int8_c:
        return extract_double_array_helper<dods_int8>(a, dest);
    case dods_uint64_c:
        return extract_double_array_helper<dods_uint64>(a, dest);
    case dods_int64_c:
        return extract_double_array_helper<dods_int64>(a, dest);
    default:
        throw InternalErr(__FILE__, __LINE__,
                          "The argument list built by the CE parser contained an unsupported numeric type.");
    }
}

double extract_double_value(BaseType *arg) {
    assert(arg);
 
    // Simple types are Byte, ..., Float64, String and Url.
    if (!arg->is_simple_type() || arg->type() == dods_str_c || arg->type() == dods_url_c)
        throw Error(malformed_expr, "The function requires a numeric-type argument.");
 
    if (!arg->read_p())
        throw InternalErr(__FILE__, __LINE__,
                          "The Evaluator built an argument list where some constants held no values.");
 
    // The types of arguments that the CE Parser will build for numeric
    // constants are limited to Uint32, Int32 and Float64. See ce_expr.y.
    // Expanded to work for any numeric type so it can be used for more than
    // just arguments.
    switch (arg->type()) {
    case dods_byte_c:
        return (double)(static_cast<Byte *>(arg)->value());
    case dods_uint16_c:
        return (double)(static_cast<UInt16 *>(arg)->value());
    case dods_int16_c:
        return (double)(static_cast<Int16 *>(arg)->value());
    case dods_uint32_c:
        return (double)(static_cast<UInt32 *>(arg)->value());
    case dods_int32_c:
        return (double)(static_cast<Int32 *>(arg)->value());
    case dods_float32_c:
        return (double)(static_cast<Float32 *>(arg)->value());
    case dods_float64_c:
        return static_cast<Float64 *>(arg)->value();
 
        // Support for DAP4 types.
    case dods_uint8_c:
        return (double)(static_cast<Byte *>(arg)->value());
    case dods_int8_c:
        return (double)(static_cast<Int8 *>(arg)->value());
    case dods_uint64_c:
        return (double)(static_cast<UInt64 *>(arg)->value());
    case dods_int64_c:
        return (double)(static_cast<Int64 *>(arg)->value());
 
    default:
        throw InternalErr(__FILE__, __LINE__,
                          "The argument list built by the parser contained an unsupported numeric type.");
    }
}
 
// Remove spaces from the start of a URL and from the start of any constraint
// expression it contains. 4/7/98 jhrg

string prune_spaces(const string &name) {
    // If the URL does not even have white space return.
    if (name.find_first_of(' ') == name.npos)
        return name;
    else {
        // Strip leading spaces from http://...
        unsigned int i = name.find_first_not_of(' ');
        string tmp_name = name.substr(i);
 
        // Strip leading spaces from constraint part (following `?').
        unsigned int j = tmp_name.find('?') + 1;
        i = tmp_name.find_first_not_of(' ', j);
        tmp_name.erase(j, i - j);
 
        return tmp_name;
    }
}
 
// Compare elements in a list of (BaseType *)s and return true if there are
// no duplicate elements, otherwise return false.
 
bool unique_names(vector<BaseType *> l, const string &var_name, const string &type_name, string &msg) {
    // copy the identifier names to a vector
    vector<string> names(l.size());
 
    int nelem = 0;
    typedef std::vector<BaseType *>::const_iterator citer;
    for (citer i = l.begin(); i != l.end(); i++) {
        assert(*i);
        names[nelem++] = (*i)->name();
        DBG(cerr << "NAMES[" << nelem - 1 << "]=" << names[nelem - 1] << endl);
    }
 
    // sort the array of names
    sort(names.begin(), names.end());
 
    // sort the array of names
    sort(names.begin(), names.end());
 
    // look for any instance of consecutive names that are ==
    for (int j = 1; j < nelem; ++j) {
        if (names[j - 1] == names[j]) {
            ostringstream oss;
            oss << "The variable `" << names[j] << "' is used more than once in " << type_name << " `" << var_name
                << "'";
            msg = oss.str();
 
            return false;
        }
    }
 
    return true;
}
 
const char *libdap_root() { return LIBDAP_ROOT; }

extern "C" const char *libdap_version() {
    // return PACKAGE_VERSION;
    // Switched to CVER which is <version>-<build_number>
    return CVER;
}
 
extern "C" const char *libdap_name() { return PACKAGE_NAME; }

string systime() {
    time_t TimBin;
 
    if (time(&TimBin) == (time_t)-1)
        return {"time() error"};
    else {
        char ctime_value[32];
        const char *ret = ctime_r(&TimBin, ctime_value);
        if (ret) {
            string TimStr = ctime_value;
            return TimStr.substr(0, TimStr.size() - 2); // remove the \n
        } else
            return {"Unknown"};
    }
}

void downcase(string &s) {
    for (unsigned int i = 0; i < s.length(); i++)
        s[i] = tolower(s[i]);
}

bool is_quoted(const string &s) { return (!s.empty() && s[0] == '\"' && s[s.length() - 1] == '\"'); }

string remove_quotes(const string &s) {
    if (is_quoted(s))
        return s.substr(1, s.length() - 2);
    else
        return s;
}

Type get_type(const char *name) {
    if (strcmp(name, "Byte") == 0)
        return dods_byte_c;
 
    if (strcmp(name, "Char") == 0)
        return dods_char_c;
 
    if (strcmp(name, "Int8") == 0)
        return dods_int8_c;
 
    if (strcmp(name, "UInt8") == 0)
        return dods_uint8_c;
 
    if (strcmp(name, "Int16") == 0)
        return dods_int16_c;
 
    if (strcmp(name, "UInt16") == 0)
        return dods_uint16_c;
 
    if (strcmp(name, "Int32") == 0)
        return dods_int32_c;
 
    if (strcmp(name, "UInt32") == 0)
        return dods_uint32_c;
 
    if (strcmp(name, "Int64") == 0)
        return dods_int64_c;
 
    if (strcmp(name, "UInt64") == 0)
        return dods_uint64_c;
 
    if (strcmp(name, "Float32") == 0)
        return dods_float32_c;
 
    if (strcmp(name, "Float64") == 0)
        return dods_float64_c;
 
    if (strcmp(name, "String") == 0)
        return dods_str_c;
 
    // accept both spellings; this might be confusing since URL
    // could be filtered through code and come out Url. Don't know...
    // jhrg 8/15/13
    if (strcmp(name, "Url") == 0 || strcmp(name, "URL") == 0)
        return dods_url_c;
 
    if (strcmp(name, "Enum") == 0)
        return dods_enum_c;
 
    if (strcmp(name, "Opaque") == 0)
        return dods_opaque_c;
 
    if (strcmp(name, "Array") == 0)
        return dods_array_c;
 
    if (strcmp(name, "Structure") == 0)
        return dods_structure_c;
 
    if (strcmp(name, "Sequence") == 0)
        return dods_sequence_c;
 
    if (strcmp(name, "Grid") == 0)
        return dods_grid_c;
 
    return dods_null_c;
}

string D2type_name(Type t) {
    switch (t) {
    case dods_null_c:
        return string("Null");
    case dods_byte_c:
        return string("Byte");
    case dods_int16_c:
        return string("Int16");
    case dods_uint16_c:
        return string("UInt16");
    case dods_int32_c:
        return string("Int32");
    case dods_uint32_c:
        return string("UInt32");
    case dods_float32_c:
        return string("Float32");
    case dods_float64_c:
        return string("Float64");
    case dods_str_c:
        return string("String");
    case dods_url_c:
        return string("Url");
 
    case dods_array_c:
        return string("Array");
    case dods_structure_c:
        return string("Structure");
    case dods_sequence_c:
        return string("Sequence");
    case dods_grid_c:
        return string("Grid");
 
    default:
        throw InternalErr(__FILE__, __LINE__, "Unknown type.");
    }
}

string D4type_name(Type t) {
    switch (t) {
    case dods_null_c:
        return string("Null");
    case dods_byte_c:
        return string("Byte");
    case dods_char_c:
        return string("Char");
    case dods_int8_c:
        return string("Int8");
    case dods_uint8_c:
        return string("UInt8");
    case dods_int16_c:
        return string("Int16");
    case dods_uint16_c:
        return string("UInt16");
    case dods_int32_c:
        return string("Int32");
    case dods_uint32_c:
        return string("UInt32");
    case dods_int64_c:
        return string("Int64");
    case dods_uint64_c:
        return string("UInt64");
    case dods_enum_c:
        return string("Enum");
 
    case dods_float32_c:
        return string("Float32");
    case dods_float64_c:
        return string("Float64");
 
    case dods_str_c:
        return string("String");
    case dods_url_c:
        return string("URL");
 
    case dods_opaque_c:
        return string("Opaque");
 
    case dods_array_c:
        return string("Array");
 
    case dods_structure_c:
        return string("Structure");
    case dods_sequence_c:
        return string("Sequence");
    case dods_group_c:
        return string("Group");
 
    default:
        throw InternalErr(__FILE__, __LINE__, "Unknown type.");
    }
}

string type_name(Type t) {
    try {
        return D4type_name(t);
    } catch (...) {
        return D2type_name(t);
    }
}

bool is_simple_type(Type t) {
    switch (t) {
 
    case dods_byte_c:
    case dods_char_c:
 
    case dods_int8_c:
    case dods_uint8_c:
 
    case dods_int16_c:
    case dods_uint16_c:
    case dods_int32_c:
    case dods_uint32_c:
 
    case dods_int64_c:
    case dods_uint64_c:
 
    case dods_float32_c:
    case dods_float64_c:
    case dods_str_c:
    case dods_url_c:
    case dods_enum_c:
    case dods_opaque_c:
        return true;
 
    case dods_null_c:
    case dods_array_c:
    case dods_structure_c:
    case dods_sequence_c:
    case dods_grid_c:
    case dods_group_c:
    default:
        return false;
    }
}

bool is_vector_type(Type t) {
    switch (t) {
    case dods_null_c:
    case dods_byte_c:
    case dods_char_c:
 
    case dods_int8_c:
    case dods_uint8_c:
 
    case dods_int16_c:
    case dods_uint16_c:
 
    case dods_int32_c:
    case dods_uint32_c:
 
    case dods_int64_c:
    case dods_uint64_c:
 
    case dods_float32_c:
    case dods_float64_c:
 
    case dods_str_c:
    case dods_url_c:
    case dods_enum_c:
    case dods_opaque_c:
        return false;
 
    case dods_array_c:
        return true;
 
    case dods_structure_c:
    case dods_sequence_c:
    case dods_grid_c:
    case dods_group_c:
    default:
        return false;
    }
}

bool is_constructor_type(Type t) {
    switch (t) {
    case dods_null_c:
    case dods_byte_c:
    case dods_char_c:
 
    case dods_int8_c:
    case dods_uint8_c:
 
    case dods_int16_c:
    case dods_uint16_c:
    case dods_int32_c:
    case dods_uint32_c:
 
    case dods_int64_c:
    case dods_uint64_c:
 
    case dods_float32_c:
    case dods_float64_c:
    case dods_str_c:
    case dods_url_c:
    case dods_enum_c:
    case dods_opaque_c:
 
    case dods_array_c:
        return false;
 
    case dods_structure_c:
    case dods_sequence_c:
    case dods_grid_c:
    case dods_group_c:
    default:
        return true;
    }
}

bool is_integer_type(Type t) {
    switch (t) {
    case dods_byte_c:
    case dods_char_c:
    case dods_int8_c:
    case dods_uint8_c:
    case dods_int16_c:
    case dods_uint16_c:
    case dods_int32_c:
    case dods_uint32_c:
    case dods_int64_c:
    case dods_uint64_c:
        return true;
    default:
        return false;
    }
}

bool dir_exists(const string &dir) {
    struct stat buf;
 
    return (stat(dir.c_str(), &buf) == 0) && (buf.st_mode & S_IFDIR);
}
 
// Jose Garcia
void append_long_to_string(long val, int base, string &str_val) {
    // The array digits contains 36 elements which are the
    // posible valid digits for out bases in the range
    // [2,36]
    char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    // result of val / base
    ldiv_t r;
 
    if (base > 36 || base < 2) {
        // no conversion if wrong base
        std::invalid_argument ex("The parameter base has an invalid value.");
        throw ex;
    }
    if (val < 0)
        str_val += '-';
    r = ldiv(labs(val), base);
 
    // output digits of val/base first
    if (r.quot > 0)
        append_long_to_string(r.quot, base, str_val);
 
    // output last digit
 
    str_val += digits[(int)r.rem];
}
 
// base defaults to 10
string long_to_string(long val, int base) {
    string s;
    append_long_to_string(val, base, s);
    return s;
}
 
// Jose Garcia
void append_double_to_string(const double &num, string &str) {
    // s having 100 characters should be enough for sprintf to do its job.
    // I want to banish all instances of sprintf. 10/5/2001 jhrg
    ostringstream oss;
    oss.precision(9);
    oss << num;
    str += oss.str();
}
 
string double_to_string(const double &num) {
    string s;
    append_double_to_string(num, s);
    return s;
}
 
// Given a pathname, return the file at the end of the path. This is used
// when reporting errors (maybe other times, too) to keep the server from
// revealing too much about its organization when sending error responses
// back to clients. 10/11/2000 jhrg
// MT-safe. 08/05/02 jhrg
 
#ifdef WIN32
static const char path_sep[] = {"\\"};
#else
static const char path_sep[] = {"/"};
#endif

string path_to_filename(string path) {
    string::size_type pos = path.rfind(path_sep);
 
    return (pos == string::npos) ? path : path.substr(++pos);
}
 
#define CHECK_BIT(tab, bit) (tab[(bit) / 8] & (1 << ((bit) % 8)))
#define BITLISTSIZE 16 /* bytes used for [chars] in compiled expr */
 
/*
 * globchars() - build a bitlist to check for character group match
 */
 
static void globchars(const char *s, const char *e, char *b) {
    int neg = 0;
 
    memset(b, '\0', BITLISTSIZE);
 
    if (*s == '^')
        neg++, s++;
 
    while (s < e) {
        int c;
 
        if (s + 2 < e && s[1] == '-') {
            for (c = s[0]; c <= s[2]; c++)
                b[c / 8] |= (1 << (c % 8));
            s += 3;
        } else {
            c = *s++;
            b[c / 8] |= (1 << (c % 8));
        }
    }
 
    if (neg) {
        int i;
        for (i = 0; i < BITLISTSIZE; i++)
            b[i] ^= 0377;
    }
 
    /* Don't include \0 in either $[chars] or $[^chars] */
 
    b[0] &= 0376;
}

int glob(const char *c, const char *s) {
    if (!c || !s)
        return 1;
 
    char bitlist[BITLISTSIZE];
    int i = 0;
    for (;;) {
        ++i;
        switch (*c++) {
        case '\0':
            return *s ? -1 : 0;
 
        case '?':
            if (!*s++)
                return i /*1*/;
            break;
 
        case '[': {
            /* scan for matching ] */
 
            const char *here = c;
            do {
                if (!*c++)
                    return i /*1*/;
            } while (here == c || *c != ']');
            c++;
 
            /* build character class bitlist */
 
            globchars(here, c, bitlist);
 
            if (!CHECK_BIT(bitlist, *(unsigned char *)s))
                return i /*1*/;
            s++;
            break;
        }
 
        case '*': {
            const char *here = s;
 
            while (*s)
                s++;
 
            /* Try to match the rest of the pattern in a recursive */
            /* call.  If the match fails we'll back up chars, retrying. */
 
            while (s != here) {
                int r;
 
                /* A fast path for the last token in a pattern */
 
                r = *c ? glob(c, s) : *s ? -1 : 0;
 
                if (!r)
                    return 0;
                else if (r < 0)
                    return i /*1*/;
 
                --s;
            }
            break;
        }
 
        case '\\':
            /* Force literal match of next char. */
 
            if (!*c || *s != *c) {
                return i /*1*/;
            } else {
                s++;
                c++;
            }
            break;
 
        default:
            if (*s++ != c[-1])
                return i /*1*/;
            break;
        }
    }
}


bool size_ok(unsigned int sz, unsigned int nelem) { return (sz > 0 && nelem < UINT_MAX / sz); }

bool pathname_ok(const string &path, bool strict) {
    if (path.length() > 255)
        return false;
 
#if 0
    // Make this use a const regex 12/1/21
    Regex name("[-0-9A-z_./]+");
    if (!strict) name = "[:print:]+";
#endif
 
    const Regex strict_name("[-0-9A-z_./]+");
    const Regex relaxed_name("[:print:]+");
 
#if 0
    string::size_type len = path.length();
#endif
    unsigned long result;
    if (strict)
        result = strict_name.match(path);
    else
        result = relaxed_name.match(path);
 
    return (result == path.length());
 
#if 0
    // Protect against casting too big an uint to int
    // if LEN is bigger than the max int32, the second test can't work
 
    // This makes no sense - len can never be > 255 given the test at the
    // start of this function. jhrg 12/1/21
    if (len > INT_MAX || result != static_cast<int>(len)) return false;
 
    return true;
#endif
}


string dap_version() {
    return (string) "OPeNDAP DAP/" + libdap_version() + ": compiled on " + __DATE__ + ":" + __TIME__;
}

string open_temp_fstream(ofstream &f, const string &name_template, const string &suffix /* = "" */) {
    vector<char> name;
    copy(name_template.begin(), name_template.end(), back_inserter(name));
    if (!suffix.empty())
        copy(suffix.begin(), suffix.end(), back_inserter(name));
    name.push_back('\0');
 
    // Use mkstemp to make and open the temp file atomically
    int tmpfile = mkstemps(name.data(), suffix.length());
    if (tmpfile == -1)
        throw Error(internal_error, "Could not make a temporary file.");
    // Open the file using C++ ofstream; get a C++ fstream object
    f.open(name.data());
    // Close the file descriptor; the file stays open because of the fstream object
    close(tmpfile);
    // Now test that the fstream object is valid
    if (f.fail())
        throw Error(internal_error, "Could not make a temporary file.");
 
    return string(name.data());
}
 
} // namespace libdap