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130 lines
2.5 KiB
C++
130 lines
2.5 KiB
C++
// File.cpp
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// This file is (C) 2002-2003 Royce Mitchell III and released under the BSD license
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#ifdef _MSC_VER
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#pragma warning ( disable : 4786 )
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#endif//_MSC_VER
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#include "File.h"
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bool File::open ( const char* filename, const char* mode )
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{
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close();
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_f = fopen ( filename, mode );
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return _f != 0;
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}
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std::string File::getline ( bool strip_crlf /*= false*/ )
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{
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std::string s = "";
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char buf[256];
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for ( ;; )
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{
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*buf = 0;
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fgets ( buf, sizeof(buf)-1, _f );
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if ( !*buf )
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break;
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s += buf;
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if ( strchr ( "\r\n", buf[strlen(buf)-1] ) )
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break;
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}
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if ( strip_crlf )
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{
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char* p = strpbrk ( &s[0], "\r\n" );
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if ( p )
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{
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*p = '\0';
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s.resize ( p-&s[0] );
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}
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}
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return s;
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}
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// this function searches for the next end-of-line and puts all data it
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// finds until then in the 'line' parameter.
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//
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// call continuously until the function returns false ( no more data )
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bool File::next_line ( std::string& line, bool strip_crlf )
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{
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line = getline(strip_crlf);
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// indicate that we're done *if*:
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// 1) there's no more data, *and*
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// 2) we're at the end of the file
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return line.size()>0 || !eof();
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}
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/*
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example usage:
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bool mycallback ( const std::string& line, int line_number, long lparam )
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{
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std::cout << line << std::endl;
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return true; // continue enumeration
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}
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File f ( "file.txt", "rb" ); // open file for binary read-only ( i.e. "rb" )
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f.enum_lines ( mycallback, 0, true );
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*/
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bool File::enum_lines ( bool (*callback)(const std::string& line, int line_number, long lparam), long lparam, bool strip_crlf )
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{
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int line_number = 0;
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for ( ;; )
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{
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std::string s = getline(strip_crlf);
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line_number++;
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if ( !s.size() )
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{
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if ( eof() )
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return true;
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else
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continue;
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}
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if ( !(*callback) ( s, line_number, lparam ) )
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return false;
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}
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}
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size_t File::length()
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{
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#ifdef WIN32
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return _filelength ( _fileno(_f) );
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#elif defined(UNIX)
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struct stat file_stat;
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verify(fstat(fileno(_f), &file_stat) == 0);
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return file_stat.st_size;
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#endif
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}
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void File::close()
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{
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if ( _f )
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{
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fclose(_f);
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_f = 0;
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}
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}
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/*static*/ bool File::LoadIntoString ( std::string& s, const char* filename )
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{
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File in ( filename, "rb" );
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if ( !in.isopened() )
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return false;
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size_t len = in.length();
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s.resize ( len + 1 );
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if ( !in.read ( &s[0], len ) )
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return false;
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s[len] = '\0';
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s.resize ( len );
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return true;
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}
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/*static*/ bool File::SaveFromString ( const char* filename, const std::string& s, bool binary )
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{
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File out ( filename, binary ? "wb" : "w" );
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if ( !out.isopened() )
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return false;
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out.write ( s.c_str(), s.size() );
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return true;
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}
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