inetd
/* $Id$ */
/* Copyright (c) 2011 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS Servers inetd */
/* 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, version 3 of the License.
*
* 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. If not, see <http://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include "token.h"
/* scan */
static Token * _scan_comment(FILE * fp, int * la);
static Token * _scan_eof(int * la);
static Token * _scan_newline(FILE * fp, int * la);
static Token * _scan_space(FILE * fp, int * la);
static Token * _scan_word(FILE * fp, int * la);
Token * scan(FILE * fp)
{
Token * t;
static int la = EOF;
if(la == EOF)
la = fgetc(fp);
if((t = _scan_comment(fp, &la))
|| (t = _scan_eof(&la))
|| (t = _scan_newline(fp, &la))
|| (t = _scan_space(fp, &la))
|| (t = _scan_word(fp, &la)))
return t;
fprintf(stderr, "%s", "inetd: scan: Should not happen...?\n");
return NULL;
}
static Token * _scan_comment(FILE * fp, int * la)
{
int c;
if(*la != '#')
return NULL;
for(;;)
{
c = fgetc(fp);
switch(c)
{
case '\r':
case '\n':
case EOF:
*la = c;
return token_new(TC_SPACE, "#");
}
}
}
static Token * _scan_eof(int * la)
{
if(*la == EOF)
return token_new(TC_EOF, "EOF");
return NULL;
}
static Token * _scan_newline(FILE * fp, int * la)
{
if(*la == '\n' || *la == '\r') /* FIXME '\r\n' */
{
*la = fgetc(fp);
return token_new(TC_NEWLINE, "\n");
}
return NULL;
}
static Token * _scan_space(FILE * fp, int * la)
{
if(isspace(*la))
{
for(; isspace(*la); *la = fgetc(fp));
return token_new(TC_SPACE, " ");
}
return NULL;
}
static Token * _scan_word(FILE * fp, int * la)
/* FIXME */
{
char * str = NULL;
int len = 0;
char * p;
Token * t;
if(!isalnum(*la) && !ispunct(*la))
return NULL;
do
{
if((p = realloc(str, len+2)) == NULL)
{
free(str);
return NULL; /* FIXME report error */
}
str = p;
str[len++] = *la;
*la = fgetc(fp);
}
while(isalnum(*la) || ispunct(*la));
str[len] = '\0';
t = token_new(TC_WORD, str);
free(str);
return t;
}
Token * check(FILE * fp, TokenCode code)
{
Token * t;
if((t = scan(fp)) == NULL)
return 0;
if(t->code == code)
return t;
token_delete(t);
return NULL;
}