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/*****************************************************************************/
/* Stream Class Library Copyright (c) 1999-2000 Sakai Hiroaki. */
/* All Rights Reserved. */
/*===========================================================================*/
/* This program is free software; you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation; either version 2, or (at your option) */
/* any later version. */
/* */
/* This program 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 General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program; see the file COPYING. If not, write to */
/* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/*****************************************************************************/
/*****************************************************************************/
/* ここから */
/*****************************************************************************/
#include "StreamP.h"
/*****************************************************************************/
/* 関数の定義 */
/*****************************************************************************/
/*===========================================================================*/
/* エラー処理 */
/*===========================================================================*/
static void Stream_ErrorExit(char * function, char * message)
{
fprintf(stderr, "Error in %s():%s\n", function, message);
exit(1);
}
/*===========================================================================*/
/* オブジェクトの生成 */
/*===========================================================================*/
/*---------------------------------------------------------------------------*/
/* オブジェクトの生成 */
/*---------------------------------------------------------------------------*/
Stream Stream_Create(CreateStreamFrom from, void * object)
{
Stream this;
this = (Stream)malloc(sizeof(_Stream));
if (this == NULL)
Stream_ErrorExit("Stream_Create", "Canot allocate memory.");
this->unget_buffer = NULL;
this->end_flag = 0;
this->from = from;
switch (this->from) {
case CREATE_NO_STREAM :
this->type = STREAM_TYPE_NONE;
this->object.dummy = NULL;
break;
case CREATE_STREAM_FROM_FILE :
this->type = STREAM_TYPE_FILE_POINTER;
this->object.file_pointer = fopen((char *)object, "rt");
if (this->object.file_pointer == NULL) {
free(this);
return (NULL);
}
break;
case CREATE_STREAM_FROM_FILE_POINTER :
this->type = STREAM_TYPE_FILE_POINTER;
this->object.file_pointer = (FILE *)object;
break;
case CREATE_STREAM_FROM_CHARACTERS :
this->type = STREAM_TYPE_CHARACTERS;
this->object.characters = (char *)object;
break;
default :
Stream_ErrorExit("Stream_Create", "Invalid type.");
}
return (this);
}
/*---------------------------------------------------------------------------*/
/* なにもないところから生成(ダミー用) */
/*---------------------------------------------------------------------------*/
Stream Stream_CreateFromNone()
{
return (Stream_Create(CREATE_NO_STREAM, (void *)NULL));
}
/*---------------------------------------------------------------------------*/
/* ファイルから生成 */
/*---------------------------------------------------------------------------*/
Stream Stream_CreateFromFile(char * filename)
{
return (Stream_Create(CREATE_STREAM_FROM_FILE, (void *)filename));
}
/*---------------------------------------------------------------------------*/
/* ファイルポインタから生成 */
/*---------------------------------------------------------------------------*/
Stream Stream_CreateFromFilePointer(FILE * fp)
{
return (Stream_Create(CREATE_STREAM_FROM_FILE_POINTER, (void *)fp));
}
/*---------------------------------------------------------------------------*/
/* 文字列(char * 型)から生成 */
/*---------------------------------------------------------------------------*/
Stream Stream_CreateFromCharacters(char * characters)
{
return (Stream_Create(CREATE_STREAM_FROM_CHARACTERS, (void *)characters));
}
/*===========================================================================*/
/* オブジェクトの消去 */
/*===========================================================================*/
int Stream_Destroy(Stream this)
{
UngetBuffer * p;
if (!this) Stream_ErrorExit("Stream_Destroy", "Object is not created.");
switch (this->from) {
case CREATE_NO_STREAM :
break;
case CREATE_STREAM_FROM_FILE :
fclose(this->object.file_pointer);
break;
case CREATE_STREAM_FROM_FILE_POINTER :
break;
case CREATE_STREAM_FROM_CHARACTERS :
break;
default :
break;
}
while (this->unget_buffer) {
p = this->unget_buffer->next;
free(this->unget_buffer);
this->unget_buffer = p;
}
free(this);
return (0);
}
/*===========================================================================*/
/* 文字列の取得 */
/*===========================================================================*/
/*---------------------------------------------------------------------------*/
/* 読み込む文字がまだあるかどうか */
/*---------------------------------------------------------------------------*/
int Stream_IsEnd(Stream this)
{
return (this->end_flag);
}
/*---------------------------------------------------------------------------*/
/* Stream から１文字を取得(get)する． */
/*---------------------------------------------------------------------------*/
int Stream_GetCharacter(Stream this)
{
UngetBuffer * p;
int c;
if (!this) Stream_ErrorExit("Stream_GetCharacter", "Object is not created.");
if (this->end_flag) {
c = EOF;
} else if (this->unget_buffer) {
c = this->unget_buffer->character;
p = this->unget_buffer->next;
free(this->unget_buffer);
this->unget_buffer = p;
} else {
switch (this->type) {
case STREAM_TYPE_NONE :
c = EOF;
this->end_flag = 1;
break;
case STREAM_TYPE_FILE_POINTER :
c = fgetc(this->object.file_pointer);
if (c == EOF) this->end_flag = 1;
break;
case STREAM_TYPE_CHARACTERS :
c = (int)(*(this->object.characters));
if (c == '\0') {
c = EOF;
this->end_flag = 1;
} else {
(this->object.characters)++;
}
break;
default :
Stream_ErrorExit("Stream_GetCharacter", "Invalid type.");
}
}
return (c);
}
/*---------------------------------------------------------------------------*/
/* Stream に１文字を返却(unget)する． */
/*---------------------------------------------------------------------------*/
int Stream_UngetCharacter(Stream this, int c)
{
UngetBuffer * p;
char character = (char)c;
if (!this)
Stream_ErrorExit("Stream_UngetCharacter", "Object is not created.");
if (c == EOF) {
this->end_flag = 1;
return (EOF);
}
p = (UngetBuffer *)malloc(sizeof(UngetBuffer));
if (!p) Stream_ErrorExit("Stream_UngetCharacter", "Cannot allocate memory.");
this->end_flag = 0;
p->character = character;
p->next = this->unget_buffer;
this->unget_buffer = p;
return (character);
}
/*---------------------------------------------------------------------------*/
/* Stream に文字列を返却(unget)する． */
/*---------------------------------------------------------------------------*/
int Stream_UngetCharacters(Stream this, char * characters)
{
int n = 0;
int i;
if (!this)
Stream_ErrorExit("Stream_UngetCharacters", "Object is not created.");
for (i = 0; characters[i] != '\0'; i++) { /* None */ }
for(i--; i >= 0; i--) {
Stream_UngetCharacter(this, characters[i]);
n++;
}
return (n);
}
/*---------------------------------------------------------------------------*/
/* 文字列中に文字があるかどうかを判定 */
/*---------------------------------------------------------------------------*/
static int CheckWord(char * s, int c)
{
if (c == EOF) return (0);
if (s == NULL) return (0);
while (*s != '\0') {
if (c == *s) return (1);
s++;
}
return (0);
}
/*---------------------------------------------------------------------------*/
/* 文字列に文字を追加 */
/*---------------------------------------------------------------------------*/
static char * AddCharacter(char * buffer, int * buf_len, int * i, char c,
int extend)
{
if (*i >= *buf_len - 1) {
if (!extend) return (buffer);
(*buf_len) *= 2;
if (!buffer) buffer = (char *)malloc(sizeof(char) * (*buf_len));
else buffer = (char *)realloc((void *)buffer, sizeof(char) * (*buf_len));
if (!buffer) Stream_ErrorExit("AddCharacter", "Cannot allocate memory.");
}
buffer[*i] = c;
(*i)++;
return (buffer);
}
/*---------------------------------------------------------------------------*/
/* Stream からトークンで区切って文字列を読み込み，文字列(String 型)で返す． */
/* 引用符やコメント行の解釈を行う． */
/*---------------------------------------------------------------------------*/
/* split1 は，複数の区切り文字が連続する場合にも，ヌル文字として切り分ける． */
/* split2 は，複数の区切り文字が連続する場合には，ひとつの区切り文字として */
/* 処理する． */
/*---------------------------------------------------------------------------*/
char * Stream_GetWord(Stream this, /* 読み込み元の Stream */
char * buffer,
int buffer_length,
char * split1, /* この文字で切り分ける */
char * split2, /* この文字でも切り分ける */
char * comment, /* コメント行の先頭文字 '#' など */
char * lineend, /* 行末文字 '\n' など */
char * quotation, /* 引用符文字 '\"' など */
char * head_skip, /* 文字列先頭の読みとばし文字 */
char * tail_skip /* 文字列末尾の読みとばし文字 */
)
{
int c;
int i = 0;
int extend = 0; /* バッファを拡張できるか */
if (!this) Stream_ErrorExit("Stream_GetWord", "Object is not created.");
do {
c = Stream_GetCharacter(this);
if (CheckWord(comment, c)) {
do {
c = Stream_GetCharacter(this);
} while (!CheckWord(lineend, c) && (c != EOF));
}
} while (CheckWord(split2, c) || CheckWord(comment, c) ||
CheckWord(lineend, c));
if (c == EOF) return (NULL); /* 読み出す単語が存在しない */
if (!buffer) {
extend = 1;
buffer_length = 10;
buffer = (char *)malloc(sizeof(char) * buffer_length);
if (!buffer) Stream_ErrorExit("Stream_GetWord", "Cannot allocate memory.");
}
if (CheckWord(quotation, c)) {
while (1) {
c = Stream_GetCharacter(this);
if (CheckWord(quotation, c) || (c == EOF)) break;
buffer = AddCharacter(buffer, &buffer_length, &i, c, extend);
}
} else {
while (CheckWord(head_skip, c) && (c != EOF))
c = Stream_GetCharacter(this);
while (1) {
if (c == EOF) {
break;
}
if (CheckWord(comment, c) || CheckWord(quotation, c) ||
CheckWord(split1, c) || CheckWord(split2, c) ||
CheckWord(lineend, c)) {
Stream_UngetCharacter(this, c);
break;
}
buffer = AddCharacter(buffer, &buffer_length, &i, c, extend);
c = Stream_GetCharacter(this);
}
while ((i > 0) && (CheckWord(tail_skip, buffer[i - 1]))) i--;
}
if (i <= buffer_length - 1) buffer[i] = '\0';
return (buffer);
}
/*****************************************************************************/
/* ここまで */
/*****************************************************************************/
/*****************************************************************************/
/* End of File. */
/*****************************************************************************/
|
