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instream.cpp
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instream.cpp
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#include "instream.h"
#include <errno.h>
#include <string.h>
namespace stream {
const int line_size = 256;
Reader::Reader(FILE *in)
: in(in), owner(false),fpos(0),pos(0),bad(0)
{
}
Reader::Reader(const char *file, const char *how)
: in((FILE*)nullptr), owner(true),fpos(0),pos(0)
{
open(file,how);
}
Reader::Reader(const std::string& file, const char *how)
: in((FILE*)nullptr), owner(true),fpos(0),pos(0)
{
open(file,how);
}
Reader::~Reader() {
close();
}
void Reader::close() {
if (owner && in != nullptr) {
close_handle();
in = nullptr;
}
}
bool Reader::fail() {
return bad != 0;
}
Reader::operator bool () {
return ! fail();
}
int Reader::error_code() {
return bad;
}
std::string Reader::error() {
return err_msg;
}
void Reader::set(FILE *new_in, bool own) {
close();
in = new_in;
owner = own;
pos = 0;
bad = in == nullptr;
}
bool Reader::open(const std::string& file, const char *how) {
in = fopen(file.c_str(),how);
bad = errno;
if (bad) {
err_msg = strerror(errno);
}
return ! bad;
}
void Reader::close_handle() {
fclose(in);
}
int Reader::read_fmt(const char *fmt, va_list ap) {
return vfscanf(in,fmt,ap);
}
char *Reader::read_raw_line(char *buff, int buffsize) {
return fgets(buff,buffsize,in);
}
size_t Reader::read(void *buff, int buffsize) {
if (fail()) return 0;
size_t sz = fread(buff,1,buffsize,in);
return sz;
}
void Reader::set_error(const std::string& msg, int code) {
err_msg = msg;
bad = code;
}
Reader& Reader::formatted_read(const char *ctype, const char *def, const char *fmt, ...) {
if (fail()) return *this;
va_list ap;
va_start(ap,fmt);
if (fmt == nullptr) {
fmt = def;
}
int res = read_fmt(fmt,ap);
if (res == EOF) {
if (errno != 0) { // we remain in hope
set_error(strerror(errno),errno);
} else { // but invariably it just means EOF
set_error("EOF reading " + std::string(ctype),EOF);
}
} else
if (res != 1 && *ctype != 'S') {
std::string chars;
(*this)(chars,"%5s");
set_error("error reading " + std::string(ctype) + " at '" + chars + "'",1);
}
pos += fpos;
va_end(ap);
return *this;
}
Reader& Reader::conversion_error(const char *kind, uint64_t val, bool was_unsigned) {
bad = ERANGE;
std::string msg = "error converting " + std::string(kind) + " out of range ";
if (was_unsigned) {
msg += std::to_string(val);
} else {
msg += std::to_string((int64_t)val);
}
set_error(msg,1);
return *this;
}
long Reader::getpos() {
return ftell(in);
}
void Reader::setpos(long p, char end) {
int whence = SEEK_SET;
if (end == '$') {
whence = SEEK_END;
} else
if (end == '.') {
whence = SEEK_CUR;
}
fseek(in,p,whence);
}
int Reader::read_line(char *buff, int buffsize) {
char *res = read_raw_line(buff,buffsize);
if (res == nullptr) {
set_error("EOF",EOF);
return 0;
}
int sz = res != nullptr ? strlen(res) : 0;
pos += sz;
return sz;
}
bool Reader::readall (std::string& s) {
char buff[512];
size_t sz;
s.clear();
while ((sz = read(buff,sizeof(buff))) > 0) {
s.append(buff,sz);
}
return errno != 0;
}
Reader& Reader::getfpos(int& p) {
p = pos;
return *this;
}
Reader& Reader::operator() (Reader::Error& err) {
err.errcode = bad;
err.msg = err_msg;
err.pos = pos;
return *this;
}
Reader& Reader::operator() (double &i,const char *fmt) {
return formatted_read("double","%lf%n",fmt,&i,&fpos);
}
Reader& Reader::operator() (float &i,const char *fmt) {
return formatted_read("float","%f%n",fmt,&i,&fpos);
}
Reader& Reader::operator() (int64_t &i,const char *fmt) {
return formatted_read("int64","%" SCNd64 "%n",fmt,&i,&fpos);
}
Reader& Reader::operator() (uint64_t &i,const char *fmt) {
return formatted_read("uint64","%" SCNu64 "%n",fmt,&i,&fpos);
}
Reader& Reader::operator() (int32_t &i,const char *fmt) {
int64_t val;
if (! (*this)(val)) return *this;
if (val < INT32_MIN || val > INT32_MAX) return conversion_error("int32",val,false);
i = (int16_t)val;
return *this;
}
Reader& Reader::operator() (uint32_t &i,const char *fmt) {
uint64_t val;
if (! (*this)(val)) return *this;
if (val > UINT32_MAX) return conversion_error("uint32",val,true);
i = (uint32_t)val;
return *this;
}
Reader& Reader::operator() (int16_t &i,const char *fmt) {
int64_t val;
if (! (*this)(val)) return *this;
if (val < INT16_MIN || val > INT16_MAX) return conversion_error("int16",val,false);
i = (int16_t)val;
return *this;
}
Reader& Reader::operator() (uint16_t &i,const char *fmt) {
uint64_t val;
if (! (*this)(val)) return *this;
if (val > UINT16_MAX) return conversion_error("uint16",val,true);
i = (uint16_t)val;
return *this;
}
Reader& Reader::operator() (char &i,const char *fmt) {
return formatted_read("char","%c%n",fmt,&i,&fpos);
}
Reader& Reader::operator() (uint8_t &i,const char *fmt) {
uint64_t val;
if (! (*this)(val)) return *this;
if (val > UINT8_MAX) return conversion_error("uchar",val,true);
i = (uint8_t)val;
return *this;
}
Reader& Reader::operator() (std::string &s,const char *fmt) {
if (fail()) return *this;
char buff[line_size];
if (! formatted_read("string","%s%n",fmt,buff,&fpos)) return *this;
s = buff;
return *this;
}
Reader& Reader::operator() (const char *extra) {
char buff[line_size];
strcpy(buff,extra);
strcat(buff,"%n");
return formatted_read("S",extra,nullptr,&fpos);
}
Reader& Reader::operator() () {
return skip();
}
Reader& Reader::getline(std::string& s) {
if (fail()) return *this;
char buff[line_size];
s.clear();
int n = read_line(buff,line_size);
while (n > 1) {
if (buff[n-1]=='\n') {
--n;
buff[n] = 0; // trim \n
s.append(buff,n);
break;
} else {
s.append(buff,n);
}
n = read_line(buff,line_size);
}
return *this;
}
Reader& Reader::skip(int lines) {
if (fail()) return *this;
int i = 0;
char buff[line_size];
while (i < lines && read_line(buff,line_size) > 0) {
++i;
}
return *this;
}
Reader::LineInfo Reader::getlineinfo (long p) {
if (p == -1)
p = pos;
setpos(0,'^');
pos = 0;
char buff[line_size];
int last_pos, lineno = 1;
read_line(buff,line_size);
while (pos < p) {
lineno++;
last_pos = pos;
read_line(buff,line_size);
}
int col = p - last_pos;
setpos(p,'^');
return {lineno, col};
}
Reader ins(stdin);
CmdReader::CmdReader(std::string cmd, std::string extra)
: Reader((FILE*)nullptr) {
std::string cmdline = cmd + " 2>&1 " + extra;
set(popen(cmdline.c_str(),"r"),true);
}
void CmdReader::close_handle() {
pclose(in);
}
std::string CmdReader::line() {
std::string tmp;
getline(tmp);
return tmp;
}
StrReader::StrReader(const std::string& s) : Reader((FILE*)nullptr), pc(s.c_str()) {
size = s.size();
}
StrReader::StrReader(const char* pc) : Reader((FILE*)nullptr), pc(pc) {
size = strlen(pc);
}
int StrReader::read_fmt(const char *fmt, va_list ap) {
if (pos >= size) {
bad = 1; return 0;
}
return vsscanf(pc+pos,fmt,ap);
}
char *StrReader::read_raw_line(char *buff, int buffsize) {
char *P = buff;
const char *Q = pc+pos;
int i = 1;
while (*Q != '\n' && i < buffsize && *Q != 0) {
*P++ = *Q++;
++i;
}
*P = 0;
return buff;
}
long StrReader::getpos() {
return pos;
}
void StrReader::setpos(long p, char end) {
if (end == '^') {
pos = p;
} else
if (end == '.') {
pos += p;
} else
if (end == '$') {
pos = size + p;
}
}
}