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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ String Util - Some useful string functions.
+
+ These have been collected from here and there to do all sorts of useful
+ things to strings. They are useful in file parsers, URI handlers and
+ especially in APT methods.
+
+ This source is placed in the Public Domain, do with it what you will
+ It was originally written by Jason Gunthorpe <jgg@gpu.srv.ualberta.ca>
+
+ ##################################################################### */
+ /*}}}*/
+// Includes /*{{{*/
+#include <config.h>
+
+#include <apt-pkg/error.h>
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/strutl.h>
+
+#include <algorithm>
+#include <array>
+#include <iomanip>
+#include <limits>
+#include <locale>
+#include <sstream>
+#include <memory>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include <ctype.h>
+#include <errno.h>
+#include <iconv.h>
+#include <regex.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <wchar.h>
+
+#include <apti18n.h>
+ /*}}}*/
+using namespace std;
+
+// Strip - Remove white space from the front and back of a string /*{{{*/
+// ---------------------------------------------------------------------
+namespace APT {
+ namespace String {
+std::string Strip(const std::string &str)
+{
+ // ensure we have at least one character
+ if (str.empty() == true)
+ return str;
+
+ char const * const s = str.c_str();
+ size_t start = 0;
+ for (; isspace(s[start]) != 0; ++start)
+ ; // find the first not-space
+
+ // string contains only whitespaces
+ if (s[start] == '\0')
+ return "";
+
+ size_t end = str.length() - 1;
+ for (; isspace(s[end]) != 0; --end)
+ ; // find the last not-space
+
+ return str.substr(start, end - start + 1);
+}
+
+bool Endswith(const std::string &s, const std::string &end)
+{
+ if (end.size() > s.size())
+ return false;
+ return (s.compare(s.size() - end.size(), end.size(), end) == 0);
+}
+
+bool Startswith(const std::string &s, const std::string &start)
+{
+ if (start.size() > s.size())
+ return false;
+ return (s.compare(0, start.size(), start) == 0);
+}
+
+std::string Join(std::vector<std::string> list, const std::string &sep)
+{
+ std::ostringstream oss;
+ for (auto it = list.begin(); it != list.end(); it++)
+ {
+ if (it != list.begin()) oss << sep;
+ oss << *it;
+ }
+ return oss.str();
+}
+
+// Returns string display length honoring multi-byte characters
+size_t DisplayLength(StringView str)
+{
+ size_t len = 0;
+
+ const char *p = str.data();
+ const char *const end = str.end();
+
+ mbstate_t state{};
+ while (p < end)
+ {
+ wchar_t wch;
+ size_t res = mbrtowc(&wch, p, end - p, &state);
+ switch (res)
+ {
+ case 0:
+ // Null wide character (i.e. L'\0') - stop
+ p = end;
+ break;
+
+ case static_cast<size_t>(-1):
+ // Byte sequence is invalid. Assume that it's
+ // a single-byte single-width character.
+ len += 1;
+ p += 1;
+
+ // state is undefined in this case - reset it
+ state = {};
+
+ break;
+
+ case static_cast<size_t>(-2):
+ // Byte sequence is too short. Assume that it's
+ // an incomplete single-width character and stop.
+ len += 1;
+ p = end;
+ break;
+
+ default:
+ len += wcwidth(wch);
+ p += res;
+ }
+ }
+
+ return len;
+}
+
+}
+}
+ /*}}}*/
+// UTF8ToCodeset - Convert some UTF-8 string for some codeset /*{{{*/
+// ---------------------------------------------------------------------
+/* This is handy to use before display some information for enduser */
+bool UTF8ToCodeset(const char *codeset, const string &orig, string *dest)
+{
+ iconv_t cd;
+ const char *inbuf;
+ char *inptr, *outbuf;
+ size_t insize, bufsize;
+ dest->clear();
+
+ cd = iconv_open(codeset, "UTF-8");
+ if (cd == (iconv_t)(-1)) {
+ // Something went wrong
+ if (errno == EINVAL)
+ _error->Error("conversion from 'UTF-8' to '%s' not available",
+ codeset);
+ else
+ perror("iconv_open");
+
+ return false;
+ }
+
+ insize = bufsize = orig.size();
+ inbuf = orig.data();
+ inptr = (char *)inbuf;
+ outbuf = new char[bufsize];
+ size_t lastError = -1;
+
+ while (insize != 0)
+ {
+ char *outptr = outbuf;
+ size_t outsize = bufsize;
+ size_t const err = iconv(cd, &inptr, &insize, &outptr, &outsize);
+ dest->append(outbuf, outptr - outbuf);
+ if (err == (size_t)(-1))
+ {
+ switch (errno)
+ {
+ case EILSEQ:
+ insize--;
+ inptr++;
+ // replace a series of unknown multibytes with a single "?"
+ if (lastError != insize) {
+ lastError = insize - 1;
+ dest->append("?");
+ }
+ break;
+ case EINVAL:
+ insize = 0;
+ break;
+ case E2BIG:
+ if (outptr == outbuf)
+ {
+ bufsize *= 2;
+ delete[] outbuf;
+ outbuf = new char[bufsize];
+ }
+ break;
+ }
+ }
+ }
+
+ delete[] outbuf;
+
+ iconv_close(cd);
+
+ return true;
+}
+ /*}}}*/
+// strstrip - Remove white space from the front and back of a string /*{{{*/
+// ---------------------------------------------------------------------
+/* This is handy to use when parsing a file. It also removes \n's left
+ over from fgets and company */
+char *_strstrip(char *String)
+{
+ for (;*String != 0 && (*String == ' ' || *String == '\t'); String++);
+
+ if (*String == 0)
+ return String;
+ return _strrstrip(String);
+}
+ /*}}}*/
+// strrstrip - Remove white space from the back of a string /*{{{*/
+// ---------------------------------------------------------------------
+char *_strrstrip(char *String)
+{
+ char *End = String + strlen(String) - 1;
+ for (;End != String - 1 && (*End == ' ' || *End == '\t' || *End == '\n' ||
+ *End == '\r'); End--);
+ End++;
+ *End = 0;
+ return String;
+}
+ /*}}}*/
+// strtabexpand - Converts tabs into 8 spaces /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+char *_strtabexpand(char *String,size_t Len)
+{
+ for (char *I = String; I != I + Len && *I != 0; I++)
+ {
+ if (*I != '\t')
+ continue;
+ if (I + 8 > String + Len)
+ {
+ *I = 0;
+ return String;
+ }
+
+ /* Assume the start of the string is 0 and find the next 8 char
+ division */
+ int Len;
+ if (String == I)
+ Len = 1;
+ else
+ Len = 8 - ((String - I) % 8);
+ Len -= 2;
+ if (Len <= 0)
+ {
+ *I = ' ';
+ continue;
+ }
+
+ memmove(I + Len,I + 1,strlen(I) + 1);
+ for (char *J = I; J + Len != I; *I = ' ', I++);
+ }
+ return String;
+}
+ /*}}}*/
+// ParseQuoteWord - Parse a single word out of a string /*{{{*/
+// ---------------------------------------------------------------------
+/* This grabs a single word, converts any % escaped characters to their
+ proper values and advances the pointer. Double quotes are understood
+ and striped out as well. This is for URI/URL parsing. It also can
+ understand [] brackets.*/
+bool ParseQuoteWord(const char *&String,string &Res)
+{
+ // Skip leading whitespace
+ const char *C = String;
+ for (; *C == ' '; C++)
+ ;
+ if (*C == 0)
+ return false;
+
+ // Jump to the next word
+ for (;*C != 0 && isspace(*C) == 0; C++)
+ {
+ if (*C == '"')
+ {
+ C = strchr(C + 1, '"');
+ if (C == NULL)
+ return false;
+ }
+ if (*C == '[')
+ {
+ C = strchr(C + 1, ']');
+ if (C == NULL)
+ return false;
+ }
+ }
+
+ // Now de-quote characters
+ Res.clear();
+ Res.reserve(C - String);
+ char Tmp[3];
+ const char *Start = String;
+ while (Start != C)
+ {
+ if (*Start == '%' && Start + 2 < C &&
+ isxdigit(Start[1]) && isxdigit(Start[2]))
+ {
+ Tmp[0] = Start[1];
+ Tmp[1] = Start[2];
+ Tmp[2] = 0;
+ Res.push_back(static_cast<char>(strtol(Tmp, 0, 16)));
+ Start += 3;
+ continue;
+ }
+ if (*Start != '"')
+ Res.push_back(*Start);
+ ++Start;
+ }
+
+ // Skip ending white space
+ for (; isspace(*C) != 0; C++)
+ ;
+ String = C;
+ return true;
+}
+ /*}}}*/
+// ParseCWord - Parses a string like a C "" expression /*{{{*/
+// ---------------------------------------------------------------------
+/* This expects a series of space separated strings enclosed in ""'s.
+ It concatenates the ""'s into a single string. */
+bool ParseCWord(const char *&String,string &Res)
+{
+ // Skip leading whitespace
+ const char *C = String;
+ for (; *C == ' '; C++)
+ ;
+ if (*C == 0)
+ return false;
+
+ Res.clear();
+ Res.reserve(strlen(String));
+ for (; *C != 0; ++C)
+ {
+ if (*C == '"')
+ {
+ for (C++; *C != 0 && *C != '"'; C++)
+ Res.push_back(*C);
+
+ if (*C == 0)
+ return false;
+
+ continue;
+ }
+
+ if (C != String && isspace(*C) != 0 && isspace(C[-1]) != 0)
+ continue;
+ if (isspace(*C) == 0)
+ return false;
+ Res.push_back(' ');
+ }
+ String = C;
+ return true;
+}
+ /*}}}*/
+// QuoteString - Convert a string into quoted from /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+string QuoteString(const string &Str, const char *Bad)
+{
+ std::stringstream Res;
+ for (string::const_iterator I = Str.begin(); I != Str.end(); ++I)
+ {
+ if (strchr(Bad,*I) != 0 || isprint(*I) == 0 ||
+ *I == 0x25 || // percent '%' char
+ *I <= 0x20 || *I >= 0x7F) // control chars
+ {
+ ioprintf(Res, "%%%02hhx", *I);
+ }
+ else
+ Res << *I;
+ }
+ return Res.str();
+}
+ /*}}}*/
+// DeQuoteString - Convert a string from quoted from /*{{{*/
+// ---------------------------------------------------------------------
+/* This undoes QuoteString */
+string DeQuoteString(const string &Str)
+{
+ return DeQuoteString(Str.begin(),Str.end());
+}
+string DeQuoteString(string::const_iterator const &begin,
+ string::const_iterator const &end)
+{
+ string Res;
+ for (string::const_iterator I = begin; I != end; ++I)
+ {
+ if (*I == '%' && I + 2 < end &&
+ isxdigit(I[1]) && isxdigit(I[2]))
+ {
+ char Tmp[3];
+ Tmp[0] = I[1];
+ Tmp[1] = I[2];
+ Tmp[2] = 0;
+ Res += (char)strtol(Tmp,0,16);
+ I += 2;
+ continue;
+ }
+ else
+ Res += *I;
+ }
+ return Res;
+}
+
+ /*}}}*/
+// SizeToStr - Convert a long into a human readable size /*{{{*/
+// ---------------------------------------------------------------------
+/* A max of 4 digits are shown before conversion to the next highest unit.
+ The max length of the string will be 5 chars unless the size is > 10
+ YottaBytes (E24) */
+string SizeToStr(double Size)
+{
+ double ASize;
+ if (Size >= 0)
+ ASize = Size;
+ else
+ ASize = -1*Size;
+
+ /* bytes, KiloBytes, MegaBytes, GigaBytes, TeraBytes, PetaBytes,
+ ExaBytes, ZettaBytes, YottaBytes */
+ char Ext[] = {'\0','k','M','G','T','P','E','Z','Y'};
+ int I = 0;
+ while (I <= 8)
+ {
+ if (ASize < 100 && I != 0)
+ {
+ std::string S;
+ strprintf(S, "%'.1f %c", ASize, Ext[I]);
+ return S;
+ }
+
+ if (ASize < 10000)
+ {
+ std::string S;
+ strprintf(S, "%'.0f %c", ASize, Ext[I]);
+ return S;
+ }
+ ASize /= 1000.0;
+ I++;
+ }
+ return "";
+}
+ /*}}}*/
+// TimeToStr - Convert the time into a string /*{{{*/
+// ---------------------------------------------------------------------
+/* Converts a number of seconds to a hms format */
+string TimeToStr(unsigned long Sec)
+{
+ std::string S;
+ if (Sec > 60*60*24)
+ {
+ //TRANSLATOR: d means days, h means hours, min means minutes, s means seconds
+ strprintf(S,_("%lid %lih %limin %lis"),Sec/60/60/24,(Sec/60/60) % 24,(Sec/60) % 60,Sec % 60);
+ }
+ else if (Sec > 60*60)
+ {
+ //TRANSLATOR: h means hours, min means minutes, s means seconds
+ strprintf(S,_("%lih %limin %lis"),Sec/60/60,(Sec/60) % 60,Sec % 60);
+ }
+ else if (Sec > 60)
+ {
+ //TRANSLATOR: min means minutes, s means seconds
+ strprintf(S,_("%limin %lis"),Sec/60,Sec % 60);
+ }
+ else
+ {
+ //TRANSLATOR: s means seconds
+ strprintf(S,_("%lis"),Sec);
+ }
+ return S;
+}
+ /*}}}*/
+// SubstVar - Substitute a string for another string /*{{{*/
+// ---------------------------------------------------------------------
+/* This replaces all occurrences of Subst with Contents in Str. */
+string SubstVar(const string &Str,const string &Subst,const string &Contents)
+{
+ if (Subst.empty() == true)
+ return Str;
+
+ string::size_type Pos = 0;
+ string::size_type OldPos = 0;
+ string Temp;
+
+ while (OldPos < Str.length() &&
+ (Pos = Str.find(Subst,OldPos)) != string::npos)
+ {
+ if (OldPos != Pos)
+ Temp.append(Str, OldPos, Pos - OldPos);
+ if (Contents.empty() == false)
+ Temp.append(Contents);
+ OldPos = Pos + Subst.length();
+ }
+
+ if (OldPos == 0)
+ return Str;
+
+ if (OldPos >= Str.length())
+ return Temp;
+
+ Temp.append(Str, OldPos, string::npos);
+ return Temp;
+}
+string SubstVar(string Str,const struct SubstVar *Vars)
+{
+ for (; Vars->Subst != 0; Vars++)
+ Str = SubstVar(Str,Vars->Subst,*Vars->Contents);
+ return Str;
+}
+ /*}}}*/
+// OutputInDepth - return a string with separator multiplied with depth /*{{{*/
+// ---------------------------------------------------------------------
+/* Returns a string with the supplied separator depth + 1 times in it */
+std::string OutputInDepth(const unsigned long Depth, const char* Separator)
+{
+ std::string output = "";
+ for(unsigned long d=Depth+1; d > 0; d--)
+ output.append(Separator);
+ return output;
+}
+ /*}}}*/
+// URItoFileName - Convert the uri into a unique file name /*{{{*/
+// ---------------------------------------------------------------------
+/* This converts a URI into a safe filename. It quotes all unsafe characters
+ and converts / to _ and removes the scheme identifier. The resulting
+ file name should be unique and never occur again for a different file */
+string URItoFileName(const string &URI)
+{
+ // Nuke 'sensitive' items
+ ::URI U(URI);
+ U.User.clear();
+ U.Password.clear();
+ U.Access.clear();
+
+ // "\x00-\x20{}|\\\\^\\[\\]<>\"\x7F-\xFF";
+ string NewURI = QuoteString(U,"\\|{}[]<>\"^~_=!@#$%^&*");
+ replace(NewURI.begin(),NewURI.end(),'/','_');
+ return NewURI;
+}
+ /*}}}*/
+// Base64Encode - Base64 Encoding routine for short strings /*{{{*/
+// ---------------------------------------------------------------------
+/* This routine performs a base64 transformation on a string. It was ripped
+ from wget and then patched and bug fixed.
+
+ This spec can be found in rfc2045 */
+string Base64Encode(const string &S)
+{
+ // Conversion table.
+ static char tbl[64] = {'A','B','C','D','E','F','G','H',
+ 'I','J','K','L','M','N','O','P',
+ 'Q','R','S','T','U','V','W','X',
+ 'Y','Z','a','b','c','d','e','f',
+ 'g','h','i','j','k','l','m','n',
+ 'o','p','q','r','s','t','u','v',
+ 'w','x','y','z','0','1','2','3',
+ '4','5','6','7','8','9','+','/'};
+
+ // Pre-allocate some space
+ string Final;
+ Final.reserve((4*S.length() + 2)/3 + 2);
+
+ /* Transform the 3x8 bits to 4x6 bits, as required by
+ base64. */
+ for (string::const_iterator I = S.begin(); I < S.end(); I += 3)
+ {
+ uint8_t Bits[3] = {0,0,0};
+ Bits[0] = I[0];
+ if (I + 1 < S.end())
+ Bits[1] = I[1];
+ if (I + 2 < S.end())
+ Bits[2] = I[2];
+
+ Final += tbl[Bits[0] >> 2];
+ Final += tbl[((Bits[0] & 3) << 4) + (Bits[1] >> 4)];
+
+ if (I + 1 >= S.end())
+ break;
+
+ Final += tbl[((Bits[1] & 0xf) << 2) + (Bits[2] >> 6)];
+
+ if (I + 2 >= S.end())
+ break;
+
+ Final += tbl[Bits[2] & 0x3f];
+ }
+
+ /* Apply the padding elements, this tells how many bytes the remote
+ end should discard */
+ if (S.length() % 3 == 2)
+ Final += '=';
+ if (S.length() % 3 == 1)
+ Final += "==";
+
+ return Final;
+}
+ /*}}}*/
+// stringcmp - Arbitrary string compare /*{{{*/
+// ---------------------------------------------------------------------
+/* This safely compares two non-null terminated strings of arbitrary
+ length */
+int stringcmp(const char *A,const char *AEnd,const char *B,const char *BEnd)
+{
+ for (; A != AEnd && B != BEnd; A++, B++)
+ if (*A != *B)
+ break;
+
+ if (A == AEnd && B == BEnd)
+ return 0;
+ if (A == AEnd)
+ return 1;
+ if (B == BEnd)
+ return -1;
+ if (*A < *B)
+ return -1;
+ return 1;
+}
+
+#if __GNUC__ >= 3
+int stringcmp(string::const_iterator A,string::const_iterator AEnd,
+ const char *B,const char *BEnd)
+{
+ for (; A != AEnd && B != BEnd; A++, B++)
+ if (*A != *B)
+ break;
+
+ if (A == AEnd && B == BEnd)
+ return 0;
+ if (A == AEnd)
+ return 1;
+ if (B == BEnd)
+ return -1;
+ if (*A < *B)
+ return -1;
+ return 1;
+}
+int stringcmp(string::const_iterator A,string::const_iterator AEnd,
+ string::const_iterator B,string::const_iterator BEnd)
+{
+ for (; A != AEnd && B != BEnd; A++, B++)
+ if (*A != *B)
+ break;
+
+ if (A == AEnd && B == BEnd)
+ return 0;
+ if (A == AEnd)
+ return 1;
+ if (B == BEnd)
+ return -1;
+ if (*A < *B)
+ return -1;
+ return 1;
+}
+#endif
+ /*}}}*/
+// stringcasecmp - Arbitrary case insensitive string compare /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+int stringcasecmp(const char *A,const char *AEnd,const char *B,const char *BEnd)
+{
+ for (; A != AEnd && B != BEnd; A++, B++)
+ if (tolower_ascii(*A) != tolower_ascii(*B))
+ break;
+
+ if (A == AEnd && B == BEnd)
+ return 0;
+ if (A == AEnd)
+ return 1;
+ if (B == BEnd)
+ return -1;
+ if (tolower_ascii(*A) < tolower_ascii(*B))
+ return -1;
+ return 1;
+}
+#if __GNUC__ >= 3
+int stringcasecmp(string::const_iterator A,string::const_iterator AEnd,
+ const char *B,const char *BEnd)
+{
+ for (; A != AEnd && B != BEnd; A++, B++)
+ if (tolower_ascii(*A) != tolower_ascii(*B))
+ break;
+
+ if (A == AEnd && B == BEnd)
+ return 0;
+ if (A == AEnd)
+ return 1;
+ if (B == BEnd)
+ return -1;
+ if (tolower_ascii(*A) < tolower_ascii(*B))
+ return -1;
+ return 1;
+}
+int stringcasecmp(string::const_iterator A,string::const_iterator AEnd,
+ string::const_iterator B,string::const_iterator BEnd)
+{
+ for (; A != AEnd && B != BEnd; A++, B++)
+ if (tolower_ascii(*A) != tolower_ascii(*B))
+ break;
+
+ if (A == AEnd && B == BEnd)
+ return 0;
+ if (A == AEnd)
+ return 1;
+ if (B == BEnd)
+ return -1;
+ if (tolower_ascii(*A) < tolower_ascii(*B))
+ return -1;
+ return 1;
+}
+#endif
+ /*}}}*/
+// LookupTag - Lookup the value of a tag in a tagged string /*{{{*/
+// ---------------------------------------------------------------------
+/* The format is like those used in package files and the method
+ communication system */
+std::string LookupTag(const std::string &Message, const char *TagC, const char *Default)
+{
+ std::string tag = std::string("\n") + TagC + ":";
+ if (Default == nullptr)
+ Default = "";
+ if (Message.length() < tag.length())
+ return Default;
+ std::transform(tag.begin(), tag.end(), tag.begin(), tolower_ascii);
+ auto valuestart = Message.cbegin();
+ // maybe the message starts directly with tag
+ if (Message[tag.length() - 2] == ':')
+ {
+ std::string lowstart = std::string("\n") + Message.substr(0, tag.length() - 1);
+ std::transform(lowstart.begin(), lowstart.end(), lowstart.begin(), tolower_ascii);
+ if (lowstart == tag)
+ valuestart = std::next(valuestart, tag.length() - 1);
+ }
+ // the tag is somewhere in the message
+ if (valuestart == Message.cbegin())
+ {
+ auto const tagbegin = std::search(Message.cbegin(), Message.cend(), tag.cbegin(), tag.cend(),
+ [](char const a, char const b) { return tolower_ascii(a) == b; });
+ if (tagbegin == Message.cend())
+ return Default;
+ valuestart = std::next(tagbegin, tag.length());
+ }
+ auto const is_whitespace = [](char const c) { return isspace_ascii(c) != 0 && c != '\n'; };
+ auto const is_newline = [](char const c) { return c == '\n'; };
+ std::string result;
+ valuestart = std::find_if_not(valuestart, Message.cend(), is_whitespace);
+ // is the first line of the value empty?
+ if (valuestart != Message.cend() && *valuestart == '\n')
+ {
+ valuestart = std::next(valuestart);
+ if (valuestart != Message.cend() && *valuestart == ' ')
+ valuestart = std::next(valuestart);
+ }
+ // extract the value over multiple lines removing trailing whitespace
+ while (valuestart < Message.cend())
+ {
+ auto const linebreak = std::find_if(valuestart, Message.cend(), is_newline);
+ auto valueend = std::prev(linebreak);
+ // skip spaces at the end of the line
+ while (valueend > valuestart && is_whitespace(*valueend))
+ valueend = std::prev(valueend);
+ // append found line to result
+ {
+ std::string tmp(valuestart, std::next(valueend));
+ if (tmp != ".")
+ {
+ if (result.empty())
+ result.assign(std::move(tmp));
+ else
+ result.append(tmp);
+ }
+ }
+ // see if the value is multiline
+ if (linebreak == Message.cend())
+ break;
+ valuestart = std::next(linebreak);
+ if (valuestart == Message.cend() || *valuestart != ' ')
+ break;
+ result.append("\n");
+ // skip the space leading a multiline (Keep all other whitespaces in the value)
+ valuestart = std::next(valuestart);
+ }
+ auto const valueend = result.find_last_not_of("\n");
+ if (valueend == std::string::npos)
+ result.clear();
+ else
+ result.erase(valueend + 1);
+ return result;
+}
+ /*}}}*/
+// StringToBool - Converts a string into a boolean /*{{{*/
+// ---------------------------------------------------------------------
+/* This inspects the string to see if it is true or if it is false and
+ then returns the result. Several variants on true/false are checked. */
+int StringToBool(const string &Text,int Default)
+{
+ char *ParseEnd;
+ int Res = strtol(Text.c_str(),&ParseEnd,0);
+ // ensure that the entire string was converted by strtol to avoid
+ // failures on "apt-cache show -a 0ad" where the "0" is converted
+ const char *TextEnd = Text.c_str()+Text.size();
+ if (ParseEnd == TextEnd && Res >= 0 && Res <= 1)
+ return Res;
+
+ // Check for positives
+ if (strcasecmp(Text.c_str(),"no") == 0 ||
+ strcasecmp(Text.c_str(),"false") == 0 ||
+ strcasecmp(Text.c_str(),"without") == 0 ||
+ strcasecmp(Text.c_str(),"off") == 0 ||
+ strcasecmp(Text.c_str(),"disable") == 0)
+ return 0;
+
+ // Check for negatives
+ if (strcasecmp(Text.c_str(),"yes") == 0 ||
+ strcasecmp(Text.c_str(),"true") == 0 ||
+ strcasecmp(Text.c_str(),"with") == 0 ||
+ strcasecmp(Text.c_str(),"on") == 0 ||
+ strcasecmp(Text.c_str(),"enable") == 0)
+ return 1;
+
+ return Default;
+}
+ /*}}}*/
+// TimeRFC1123 - Convert a time_t into RFC1123 format /*{{{*/
+// ---------------------------------------------------------------------
+/* This converts a time_t into a string time representation that is
+ year 2000 compliant and timezone neutral */
+string TimeRFC1123(time_t Date, bool const NumericTimezone)
+{
+ struct tm Conv;
+ if (gmtime_r(&Date, &Conv) == NULL)
+ return "";
+
+ auto const posix = std::locale::classic();
+ std::ostringstream datestr;
+ datestr.imbue(posix);
+ APT::StringView const fmt("%a, %d %b %Y %H:%M:%S");
+ std::use_facet<std::time_put<char>>(posix).put(
+ std::ostreambuf_iterator<char>(datestr),
+ datestr, ' ', &Conv, fmt.data(), fmt.data() + fmt.size());
+ if (NumericTimezone)
+ datestr << " +0000";
+ else
+ datestr << " GMT";
+ return datestr.str();
+}
+ /*}}}*/
+// ReadMessages - Read messages from the FD /*{{{*/
+// ---------------------------------------------------------------------
+/* This pulls full messages from the input FD into the message buffer.
+ It assumes that messages will not pause during transit so no
+ fancy buffering is used.
+
+ In particular: this reads blocks from the input until it believes
+ that it's run out of input text. Each block is terminated by a
+ double newline ('\n' followed by '\n').
+ */
+bool ReadMessages(int Fd, vector<string> &List)
+{
+ char Buffer[64000];
+ // Represents any left-over from the previous iteration of the
+ // parse loop. (i.e., if a message is split across the end
+ // of the buffer, it goes here)
+ string PartialMessage;
+
+ do {
+ int const Res = read(Fd, Buffer, sizeof(Buffer));
+ if (Res < 0 && errno == EINTR)
+ continue;
+
+ // process we read from has died
+ if (Res == 0)
+ return false;
+
+ // No data
+#if EAGAIN != EWOULDBLOCK
+ if (Res < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))
+#else
+ if (Res < 0 && errno == EAGAIN)
+#endif
+ return true;
+ if (Res < 0)
+ return false;
+
+ // extract the message(s) from the buffer
+ char const *Start = Buffer;
+ char const * const End = Buffer + Res;
+
+ char const * NL = (char const *) memchr(Start, '\n', End - Start);
+ if (NL == NULL)
+ {
+ // end of buffer: store what we have so far and read new data in
+ PartialMessage.append(Start, End - Start);
+ Start = End;
+ }
+ else
+ ++NL;
+
+ if (PartialMessage.empty() == false && Start < End)
+ {
+ // if we start with a new line, see if the partial message we have ended with one
+ // so that we properly detect records ending between two read() runs
+ // cases are: \n|\n , \r\n|\r\n and \r\n\r|\n
+ // the case \r|\n\r\n is handled by the usual double-newline handling
+ if ((NL - Start) == 1 || ((NL - Start) == 2 && *Start == '\r'))
+ {
+ if (APT::String::Endswith(PartialMessage, "\n") || APT::String::Endswith(PartialMessage, "\r\n\r"))
+ {
+ PartialMessage.erase(PartialMessage.find_last_not_of("\r\n") + 1);
+ List.push_back(PartialMessage);
+ PartialMessage.clear();
+ while (NL < End && (*NL == '\n' || *NL == '\r')) ++NL;
+ Start = NL;
+ }
+ }
+ }
+
+ while (Start < End) {
+ char const * NL2 = (char const *) memchr(NL, '\n', End - NL);
+ if (NL2 == NULL)
+ {
+ // end of buffer: store what we have so far and read new data in
+ PartialMessage.append(Start, End - Start);
+ break;
+ }
+ ++NL2;
+
+ // did we find a double newline?
+ if ((NL2 - NL) == 1 || ((NL2 - NL) == 2 && *NL == '\r'))
+ {
+ PartialMessage.append(Start, NL2 - Start);
+ PartialMessage.erase(PartialMessage.find_last_not_of("\r\n") + 1);
+ List.push_back(PartialMessage);
+ PartialMessage.clear();
+ while (NL2 < End && (*NL2 == '\n' || *NL2 == '\r')) ++NL2;
+ Start = NL2;
+ }
+ NL = NL2;
+ }
+
+ // we have read at least one complete message and nothing left
+ if (PartialMessage.empty() == true)
+ return true;
+
+ if (WaitFd(Fd) == false)
+ return false;
+ } while (true);
+}
+ /*}}}*/
+// MonthConv - Converts a month string into a number /*{{{*/
+// ---------------------------------------------------------------------
+/* This was lifted from the boa webserver which lifted it from 'wn-v1.07'
+ Made it a bit more robust with a few tolower_ascii though. */
+static int MonthConv(char const * const Month)
+{
+ switch (tolower_ascii(*Month))
+ {
+ case 'a':
+ return tolower_ascii(Month[1]) == 'p'?3:7;
+ case 'd':
+ return 11;
+ case 'f':
+ return 1;
+ case 'j':
+ if (tolower_ascii(Month[1]) == 'a')
+ return 0;
+ return tolower_ascii(Month[2]) == 'n'?5:6;
+ case 'm':
+ return tolower_ascii(Month[2]) == 'r'?2:4;
+ case 'n':
+ return 10;
+ case 'o':
+ return 9;
+ case 's':
+ return 8;
+
+ // Pretend it is January..
+ default:
+ return 0;
+ }
+}
+ /*}}}*/
+// timegm - Internal timegm if the gnu version is not available /*{{{*/
+// ---------------------------------------------------------------------
+/* Converts struct tm to time_t, assuming the data in tm is UTC rather
+ than local timezone (mktime assumes the latter).
+
+ This function is a nonstandard GNU extension that is also present on
+ the BSDs and maybe other systems. For others we follow the advice of
+ the manpage of timegm and use his portable replacement. */
+#ifndef HAVE_TIMEGM
+static time_t timegm(struct tm *t)
+{
+ char *tz = getenv("TZ");
+ setenv("TZ", "", 1);
+ tzset();
+ time_t ret = mktime(t);
+ if (tz)
+ setenv("TZ", tz, 1);
+ else
+ unsetenv("TZ");
+ tzset();
+ return ret;
+}
+#endif
+ /*}}}*/
+// RFC1123StrToTime - Converts an HTTP1.1 full date strings into a time_t /*{{{*/
+// ---------------------------------------------------------------------
+/* tries to parses a full date as specified in RFC7231 §7.1.1.1
+ with one exception: HTTP/1.1 valid dates need to have GMT as timezone.
+ As we encounter dates from UTC or with a numeric timezone in other places,
+ we allow them here to to be able to reuse the method. Either way, a date
+ must be in UTC or parsing will fail. Previous implementations of this
+ method used to ignore the timezone and assume always UTC. */
+bool RFC1123StrToTime(std::string const &str,time_t &time)
+{
+ unsigned short day = 0;
+ signed int year = 0; // yes, Y23K problem – we going to worry then…
+ std::string weekday, month, datespec, timespec, zone;
+ std::istringstream ss(str);
+ auto const &posix = std::locale::classic();
+ ss.imbue(posix);
+ ss >> weekday;
+ // we only superficially check weekday, mostly to avoid accepting localized
+ // weekdays here and take only its length to decide which datetime format we
+ // encounter here. The date isn't stored.
+ std::transform(weekday.begin(), weekday.end(), weekday.begin(), ::tolower);
+ std::array<char const * const, 7> c_weekdays = {{ "sun", "mon", "tue", "wed", "thu", "fri", "sat" }};
+ if (std::find(c_weekdays.begin(), c_weekdays.end(), weekday.substr(0,3)) == c_weekdays.end())
+ return false;
+
+ switch (weekday.length())
+ {
+ case 4:
+ // Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
+ if (weekday[3] != ',')
+ return false;
+ ss >> day >> month >> year >> timespec >> zone;
+ break;
+ case 3:
+ // Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
+ ss >> month >> day >> timespec >> year;
+ zone = "UTC";
+ break;
+ case 0:
+ case 1:
+ case 2:
+ return false;
+ default:
+ // Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
+ if (weekday[weekday.length() - 1] != ',')
+ return false;
+ ss >> datespec >> timespec >> zone;
+ auto const expldate = VectorizeString(datespec, '-');
+ if (expldate.size() != 3)
+ return false;
+ try {
+ size_t pos;
+ day = std::stoi(expldate[0], &pos);
+ if (pos != expldate[0].length())
+ return false;
+ year = 1900 + std::stoi(expldate[2], &pos);
+ if (pos != expldate[2].length())
+ return false;
+ strprintf(datespec, "%.4d-%.2d-%.2d", year, MonthConv(expldate[1].c_str()) + 1, day);
+ } catch (...) {
+ return false;
+ }
+ break;
+ }
+
+ if (ss.fail() || ss.bad() || !ss.eof())
+ return false;
+
+ if (zone != "GMT" && zone != "UTC" && zone != "Z") // RFC 822
+ {
+ // numeric timezones as a should of RFC 1123 and generally preferred
+ try {
+ size_t pos;
+ auto const z = std::stoi(zone, &pos);
+ if (z != 0 || pos != zone.length())
+ return false;
+ } catch (...) {
+ return false;
+ }
+ }
+
+ if (datespec.empty())
+ {
+ if (month.empty())
+ return false;
+ strprintf(datespec, "%.4d-%.2d-%.2d", year, MonthConv(month.c_str()) + 1, day);
+ }
+
+ std::string const datetime = datespec + ' ' + timespec;
+ struct tm Tm;
+ if (strptime(datetime.c_str(), "%Y-%m-%d %H:%M:%S", &Tm) == nullptr)
+ return false;
+ time = timegm(&Tm);
+ return true;
+}
+ /*}}}*/
+// FTPMDTMStrToTime - Converts a ftp modification date into a time_t /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FTPMDTMStrToTime(const char* const str,time_t &time)
+{
+ struct tm Tm;
+ // MDTM includes no whitespaces but recommend and ignored by strptime
+ if (strptime(str, "%Y %m %d %H %M %S", &Tm) == NULL)
+ return false;
+
+ time = timegm(&Tm);
+ return true;
+}
+ /*}}}*/
+// StrToNum - Convert a fixed length string to a number /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used in decoding the crazy fixed length string headers in
+ tar and ar files. */
+bool StrToNum(const char *Str,unsigned long &Res,unsigned Len,unsigned Base)
+{
+ unsigned long long BigRes;
+ if (not StrToNum(Str, BigRes, Len, Base))
+ return false;
+
+ if (std::numeric_limits<unsigned long>::max() < BigRes)
+ return false;
+
+ Res = BigRes;
+ return true;
+}
+ /*}}}*/
+// StrToNum - Convert a fixed length string to a number /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used in decoding the crazy fixed length string headers in
+ tar and ar files. */
+bool StrToNum(const char *Str,unsigned long long &Res,unsigned Len,unsigned Base)
+{
+ char S[30];
+ if (Len >= sizeof(S))
+ return false;
+ memcpy(S,Str,Len);
+ S[Len] = 0;
+
+ // All spaces is a zero
+ Res = 0;
+ unsigned I;
+ for (I = 0; S[I] == ' '; ++I);
+ if (S[I] == 0)
+ return true;
+ if (S[I] == '-')
+ return false;
+
+ char *End;
+ errno = 0;
+ Res = strtoull(S,&End,Base);
+ return not (End == S || errno != 0);
+}
+ /*}}}*/
+
+// Base256ToNum - Convert a fixed length binary to a number /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used in decoding the 256bit encoded fixed length fields in
+ tar files */
+bool Base256ToNum(const char *Str,unsigned long long &Res,unsigned int Len)
+{
+ if ((Str[0] & 0x80) == 0)
+ return false;
+ else
+ {
+ Res = Str[0] & 0x7F;
+ for(unsigned int i = 1; i < Len; ++i)
+ Res = (Res<<8) + Str[i];
+ return true;
+ }
+}
+ /*}}}*/
+// Base256ToNum - Convert a fixed length binary to a number /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used in decoding the 256bit encoded fixed length fields in
+ tar files */
+bool Base256ToNum(const char *Str,unsigned long &Res,unsigned int Len)
+{
+ unsigned long long Num = 0;
+ bool rc;
+
+ rc = Base256ToNum(Str, Num, Len);
+ // rudimentary check for overflow (Res = ulong, Num = ulonglong)
+ Res = Num;
+ if (Res != Num)
+ return false;
+
+ return rc;
+}
+ /*}}}*/
+// HexDigit - Convert a hex character into an integer /*{{{*/
+// ---------------------------------------------------------------------
+/* Helper for Hex2Num */
+static int HexDigit(int c)
+{
+ if (c >= '0' && c <= '9')
+ return c - '0';
+ if (c >= 'a' && c <= 'f')
+ return c - 'a' + 10;
+ if (c >= 'A' && c <= 'F')
+ return c - 'A' + 10;
+ return -1;
+}
+ /*}}}*/
+// Hex2Num - Convert a long hex number into a buffer /*{{{*/
+// ---------------------------------------------------------------------
+/* The length of the buffer must be exactly 1/2 the length of the string. */
+bool Hex2Num(const APT::StringView Str,unsigned char *Num,unsigned int Length)
+{
+ if (Str.length() != Length*2)
+ return false;
+
+ // Convert each digit. We store it in the same order as the string
+ int J = 0;
+ for (auto I = Str.begin(); I != Str.end();J++, I += 2)
+ {
+ int first_half = HexDigit(I[0]);
+ int second_half;
+ if (first_half < 0)
+ return false;
+
+ second_half = HexDigit(I[1]);
+ if (second_half < 0)
+ return false;
+ Num[J] = first_half << 4;
+ Num[J] += second_half;
+ }
+
+ return true;
+}
+ /*}}}*/
+// TokSplitString - Split a string up by a given token /*{{{*/
+// ---------------------------------------------------------------------
+/* This is intended to be a faster splitter, it does not use dynamic
+ memories. Input is changed to insert nulls at each token location. */
+bool TokSplitString(char Tok,char *Input,char **List,
+ unsigned long ListMax)
+{
+ // Strip any leading spaces
+ char *Start = Input;
+ char *Stop = Start + strlen(Start);
+ for (; *Start != 0 && isspace(*Start) != 0; Start++);
+
+ unsigned long Count = 0;
+ char *Pos = Start;
+ while (Pos != Stop)
+ {
+ // Skip to the next Token
+ for (; Pos != Stop && *Pos != Tok; Pos++);
+
+ // Back remove spaces
+ char *End = Pos;
+ for (; End > Start && (End[-1] == Tok || isspace(End[-1]) != 0); End--);
+ *End = 0;
+
+ List[Count++] = Start;
+ if (Count >= ListMax)
+ {
+ List[Count-1] = 0;
+ return false;
+ }
+
+ // Advance pos
+ for (; Pos != Stop && (*Pos == Tok || isspace(*Pos) != 0 || *Pos == 0); Pos++);
+ Start = Pos;
+ }
+
+ List[Count] = 0;
+ return true;
+}
+ /*}}}*/
+// VectorizeString - Split a string up into a vector of strings /*{{{*/
+// ---------------------------------------------------------------------
+/* This can be used to split a given string up into a vector, so the
+ propose is the same as in the method above and this one is a bit slower
+ also, but the advantage is that we have an iteratable vector */
+vector<string> VectorizeString(string const &haystack, char const &split)
+{
+ vector<string> exploded;
+ if (haystack.empty() == true)
+ return exploded;
+ string::const_iterator start = haystack.begin();
+ string::const_iterator end = start;
+ do {
+ for (; end != haystack.end() && *end != split; ++end);
+ exploded.push_back(string(start, end));
+ start = end + 1;
+ } while (end != haystack.end() && (++end) != haystack.end());
+ return exploded;
+}
+ /*}}}*/
+// StringSplit - split a string into a string vector by token /*{{{*/
+// ---------------------------------------------------------------------
+/* See header for details.
+ */
+vector<string> StringSplit(std::string const &s, std::string const &sep,
+ unsigned int maxsplit)
+{
+ vector<string> split;
+ size_t start, pos;
+
+ // no separator given, this is bogus
+ if(sep.size() == 0)
+ return split;
+
+ start = pos = 0;
+ while (pos != string::npos)
+ {
+ pos = s.find(sep, start);
+ split.push_back(s.substr(start, pos-start));
+
+ // if maxsplit is reached, the remaining string is the last item
+ if(split.size() >= maxsplit)
+ {
+ split[split.size()-1] = s.substr(start);
+ break;
+ }
+ start = pos+sep.size();
+ }
+ return split;
+}
+ /*}}}*/
+// RegexChoice - Simple regex list/list matcher /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+unsigned long RegexChoice(RxChoiceList *Rxs,const char **ListBegin,
+ const char **ListEnd)
+{
+ for (RxChoiceList *R = Rxs; R->Str != 0; R++)
+ R->Hit = false;
+
+ unsigned long Hits = 0;
+ for (; ListBegin < ListEnd; ++ListBegin)
+ {
+ // Check if the name is a regex
+ const char *I;
+ bool Regex = true;
+ for (I = *ListBegin; *I != 0; I++)
+ if (*I == '.' || *I == '?' || *I == '*' || *I == '|')
+ break;
+ if (*I == 0)
+ Regex = false;
+
+ // Compile the regex pattern
+ regex_t Pattern;
+ if (Regex == true)
+ if (regcomp(&Pattern,*ListBegin,REG_EXTENDED | REG_ICASE |
+ REG_NOSUB) != 0)
+ Regex = false;
+
+ // Search the list
+ bool Done = false;
+ for (RxChoiceList *R = Rxs; R->Str != 0; R++)
+ {
+ if (R->Str[0] == 0)
+ continue;
+
+ if (strcasecmp(R->Str,*ListBegin) != 0)
+ {
+ if (Regex == false)
+ continue;
+ if (regexec(&Pattern,R->Str,0,0,0) != 0)
+ continue;
+ }
+ Done = true;
+
+ if (R->Hit == false)
+ Hits++;
+
+ R->Hit = true;
+ }
+
+ if (Regex == true)
+ regfree(&Pattern);
+
+ if (Done == false)
+ _error->Warning(_("Selection %s not found"),*ListBegin);
+ }
+
+ return Hits;
+}
+ /*}}}*/
+// {str,io}printf - C format string outputter to C++ strings/iostreams /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used to make the internationalization strings easier to translate
+ and to allow reordering of parameters */
+bool iovprintf(std::ostream &out, const char *format,
+ va_list &args, ssize_t &size) {
+ auto S = std::unique_ptr<char,decltype(&free)>{static_cast<char*>(malloc(size)), &free};
+ ssize_t const n = vsnprintf(S.get(), size, format, args);
+ if (n > -1 && n < size) {
+ out << S.get();
+ return true;
+ } else {
+ if (n > -1)
+ size = n + 1;
+ else
+ size *= 2;
+ }
+ return false;
+}
+void ioprintf(ostream &out,const char *format,...)
+{
+ va_list args;
+ ssize_t size = 400;
+ while (true) {
+ bool ret;
+ va_start(args,format);
+ ret = iovprintf(out, format, args, size);
+ va_end(args);
+ if (ret == true)
+ return;
+ }
+}
+void strprintf(string &out,const char *format,...)
+{
+ va_list args;
+ ssize_t size = 400;
+ std::ostringstream outstr;
+ while (true) {
+ bool ret;
+ va_start(args,format);
+ ret = iovprintf(outstr, format, args, size);
+ va_end(args);
+ if (ret == true)
+ break;
+ }
+ out = outstr.str();
+}
+ /*}}}*/
+// safe_snprintf - Safer snprintf /*{{{*/
+// ---------------------------------------------------------------------
+/* This is a snprintf that will never (ever) go past 'End' and returns a
+ pointer to the end of the new string. The returned string is always null
+ terminated unless Buffer == end. This is a better alterantive to using
+ consecutive snprintfs. */
+char *safe_snprintf(char *Buffer,char *End,const char *Format,...)
+{
+ va_list args;
+ int Did;
+
+ if (End <= Buffer)
+ return End;
+ va_start(args,Format);
+ Did = vsnprintf(Buffer,End - Buffer,Format,args);
+ va_end(args);
+
+ if (Did < 0 || Buffer + Did > End)
+ return End;
+ return Buffer + Did;
+}
+ /*}}}*/
+// StripEpoch - Remove the version "epoch" from a version string /*{{{*/
+// ---------------------------------------------------------------------
+string StripEpoch(const string &VerStr)
+{
+ size_t i = VerStr.find(":");
+ if (i == string::npos)
+ return VerStr;
+ return VerStr.substr(i+1);
+}
+ /*}}}*/
+
+// tolower_ascii - tolower() function that ignores the locale /*{{{*/
+// ---------------------------------------------------------------------
+/* This little function is the most called method we have and tries
+ therefore to do the absolute minimum - and is notable faster than
+ standard tolower/toupper and as a bonus avoids problems with different
+ locales - we only operate on ascii chars anyway. */
+#undef tolower_ascii
+int tolower_ascii(int const c) APT_PURE APT_COLD;
+int tolower_ascii(int const c)
+{
+ return tolower_ascii_inline(c);
+}
+ /*}}}*/
+
+// isspace_ascii - isspace() function that ignores the locale /*{{{*/
+// ---------------------------------------------------------------------
+/* This little function is one of the most called methods we have and tries
+ therefore to do the absolute minimum - and is notable faster than
+ standard isspace() and as a bonus avoids problems with different
+ locales - we only operate on ascii chars anyway. */
+#undef isspace_ascii
+int isspace_ascii(int const c) APT_PURE APT_COLD;
+int isspace_ascii(int const c)
+{
+ return isspace_ascii_inline(c);
+}
+ /*}}}*/
+
+// CheckDomainList - See if Host is in a , separate list /*{{{*/
+// ---------------------------------------------------------------------
+/* The domain list is a comma separate list of domains that are suffix
+ matched against the argument */
+bool CheckDomainList(const string &Host,const string &List)
+{
+ string::const_iterator Start = List.begin();
+ for (string::const_iterator Cur = List.begin(); Cur <= List.end(); ++Cur)
+ {
+ if (Cur < List.end() && *Cur != ',')
+ continue;
+
+ // Match the end of the string..
+ if ((Host.size() >= (unsigned)(Cur - Start)) &&
+ Cur - Start != 0 &&
+ stringcasecmp(Host.end() - (Cur - Start),Host.end(),Start,Cur) == 0)
+ return true;
+
+ Start = Cur + 1;
+ }
+ return false;
+}
+ /*}}}*/
+// strv_length - Return the length of a NULL-terminated string array /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+size_t strv_length(const char **str_array)
+{
+ size_t i;
+ for (i=0; str_array[i] != NULL; i++)
+ /* nothing */
+ ;
+ return i;
+}
+ /*}}}*/
+// DeEscapeString - unescape (\0XX and \xXX) from a string /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+string DeEscapeString(const string &input)
+{
+ char tmp[3];
+ string::const_iterator it;
+ string output;
+ for (it = input.begin(); it != input.end(); ++it)
+ {
+ // just copy non-escape chars
+ if (*it != '\\')
+ {
+ output += *it;
+ continue;
+ }
+
+ // deal with double escape
+ if (*it == '\\' &&
+ (it + 1 < input.end()) && it[1] == '\\')
+ {
+ // copy
+ output += *it;
+ // advance iterator one step further
+ ++it;
+ continue;
+ }
+
+ // ensure we have a char to read
+ if (it + 1 == input.end())
+ continue;
+
+ // read it
+ ++it;
+ switch (*it)
+ {
+ case '0':
+ if (it + 2 < input.end()) {
+ tmp[0] = it[1];
+ tmp[1] = it[2];
+ tmp[2] = 0;
+ output += (char)strtol(tmp, 0, 8);
+ it += 2;
+ } else {
+ // FIXME: raise exception here?
+ }
+ break;
+ case 'x':
+ if (it + 2 < input.end()) {
+ tmp[0] = it[1];
+ tmp[1] = it[2];
+ tmp[2] = 0;
+ output += (char)strtol(tmp, 0, 16);
+ it += 2;
+ } else {
+ // FIXME: raise exception here?
+ }
+ break;
+ default:
+ // FIXME: raise exception here?
+ break;
+ }
+ }
+ return output;
+}
+ /*}}}*/
+// URI::CopyFrom - Copy from an object /*{{{*/
+// ---------------------------------------------------------------------
+/* This parses the URI into all of its components */
+void URI::CopyFrom(const string &U)
+{
+ string::const_iterator I = U.begin();
+
+ // Locate the first colon, this separates the scheme
+ for (; I < U.end() && *I != ':' ; ++I);
+ string::const_iterator FirstColon = I;
+
+ /* Determine if this is a host type URI with a leading double //
+ and then search for the first single / */
+ string::const_iterator SingleSlash = I;
+ if (I + 3 < U.end() && I[1] == '/' && I[2] == '/')
+ SingleSlash += 3;
+
+ /* Find the / indicating the end of the hostname, ignoring /'s in the
+ square brackets */
+ bool InBracket = false;
+ for (; SingleSlash < U.end() && (*SingleSlash != '/' || InBracket == true); ++SingleSlash)
+ {
+ if (*SingleSlash == '[')
+ InBracket = true;
+ if (InBracket == true && *SingleSlash == ']')
+ InBracket = false;
+ }
+
+ if (SingleSlash > U.end())
+ SingleSlash = U.end();
+
+ // We can now write the access and path specifiers
+ Access.assign(U.begin(),FirstColon);
+ if (SingleSlash != U.end())
+ Path.assign(SingleSlash,U.end());
+ if (Path.empty() == true)
+ Path = "/";
+
+ // Now we attempt to locate a user:pass@host fragment
+ if (FirstColon + 2 <= U.end() && FirstColon[1] == '/' && FirstColon[2] == '/')
+ FirstColon += 3;
+ else
+ FirstColon += 1;
+ if (FirstColon >= U.end())
+ return;
+
+ if (FirstColon > SingleSlash)
+ FirstColon = SingleSlash;
+
+ // Find the colon...
+ I = FirstColon + 1;
+ if (I > SingleSlash)
+ I = SingleSlash;
+
+ // Search for the @ separating user:pass from host
+ auto const RevAt = std::find(
+ std::string::const_reverse_iterator(SingleSlash),
+ std::string::const_reverse_iterator(I), '@');
+ string::const_iterator const At = RevAt.base() == I ? SingleSlash : std::prev(RevAt.base());
+ // and then look for the colon between user and pass
+ string::const_iterator const SecondColon = std::find(I, At, ':');
+
+ // Now write the host and user/pass
+ if (At == SingleSlash)
+ {
+ if (FirstColon < SingleSlash)
+ Host.assign(FirstColon,SingleSlash);
+ }
+ else
+ {
+ Host.assign(At+1,SingleSlash);
+ // username and password must be encoded (RFC 3986)
+ User.assign(DeQuoteString(FirstColon,SecondColon));
+ if (SecondColon < At)
+ Password.assign(DeQuoteString(SecondColon+1,At));
+ }
+
+ // Now we parse the RFC 2732 [] hostnames.
+ unsigned long PortEnd = 0;
+ InBracket = false;
+ for (unsigned I = 0; I != Host.length();)
+ {
+ if (Host[I] == '[')
+ {
+ InBracket = true;
+ Host.erase(I,1);
+ continue;
+ }
+
+ if (InBracket == true && Host[I] == ']')
+ {
+ InBracket = false;
+ Host.erase(I,1);
+ PortEnd = I;
+ continue;
+ }
+ I++;
+ }
+
+ // Tsk, weird.
+ if (InBracket == true)
+ {
+ Host.clear();
+ return;
+ }
+
+ // Now we parse off a port number from the hostname
+ Port = 0;
+ string::size_type Pos = Host.rfind(':');
+ if (Pos == string::npos || Pos < PortEnd)
+ return;
+
+ Port = atoi(string(Host,Pos+1).c_str());
+ Host.assign(Host,0,Pos);
+}
+ /*}}}*/
+// URI::operator string - Convert the URI to a string /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+URI::operator string()
+{
+ std::stringstream Res;
+
+ if (Access.empty() == false)
+ Res << Access << ':';
+
+ if (Host.empty() == false)
+ {
+ if (Access.empty() == false)
+ Res << "//";
+
+ if (User.empty() == false)
+ {
+ // FIXME: Technically userinfo is permitted even less
+ // characters than these, but this is not conveniently
+ // expressed with a denylist.
+ Res << QuoteString(User, ":/?#[]@");
+ if (Password.empty() == false)
+ Res << ":" << QuoteString(Password, ":/?#[]@");
+ Res << "@";
+ }
+
+ // Add RFC 2732 escaping characters
+ if (Access.empty() == false && Host.find_first_of("/:") != string::npos)
+ Res << '[' << Host << ']';
+ else
+ Res << Host;
+
+ if (Port != 0)
+ Res << ':' << std::to_string(Port);
+ }
+
+ if (Path.empty() == false)
+ {
+ if (Path[0] != '/')
+ Res << "/" << Path;
+ else
+ Res << Path;
+ }
+
+ return Res.str();
+}
+ /*}}}*/
+// URI::SiteOnly - Return the schema and site for the URI /*{{{*/
+string URI::SiteOnly(const string &URI)
+{
+ ::URI U(URI);
+ U.User.clear();
+ U.Password.clear();
+ U.Path.clear();
+ return U;
+}
+ /*}}}*/
+// URI::ArchiveOnly - Return the schema, site and cleaned path for the URI /*{{{*/
+string URI::ArchiveOnly(const string &URI)
+{
+ ::URI U(URI);
+ U.User.clear();
+ U.Password.clear();
+ if (U.Path.empty() == false && U.Path[U.Path.length() - 1] == '/')
+ U.Path.erase(U.Path.length() - 1);
+ return U;
+}
+ /*}}}*/
+// URI::NoUserPassword - Return the schema, site and path for the URI /*{{{*/
+string URI::NoUserPassword(const string &URI)
+{
+ ::URI U(URI);
+ U.User.clear();
+ U.Password.clear();
+ return U;
+}
+ /*}}}*/
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 04:16:58 +0000