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/*
* Copyright (C) 2007-2008 Andreas Steffen
* Hochschule fuer Technik Rapperswil
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/lgpl.txt>.
*
* This library 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 Library General Public
* License for more details.
*/
#include <stdio.h>
#include <errno.h>
#include <library.h>
#include <debug.h>
#include <utils/lexparser.h>
#include "optionsfrom.h"
#define MAX_USES 20 /* loop-detection limit */
#define MORE_ARGS 10 /* first guess at how many arguments we'll need */
/*
* Defined in header.
*/
typedef struct private_options_t private_options_t;
/**
* Private data of a options_t object.
*/
struct private_options_t {
/**
* Public interface
*/
options_t public;
/**
* reallocated argv array
*/
char **newargv;
/**
* number of free arguments in newargv
*/
int room;
/**
* number of included option files
*/
int nuses;
/**
* allocated space for option files
*/
char *buffers[MAX_USES];
};
/**
* Defined in header
*/
bool from(private_options_t *this, char *filename, int *argcp, char **argvp[],
int optind)
{
int newargc;
int next; /* place for next argument */
char **newargv;
size_t bytes;
chunk_t src, line, token;
bool good = TRUE;
int linepos = 0;
FILE *fd;
/* avoid endless loops with recursive --optionsfrom arguments */
this->nuses++;
if (this->nuses >= MAX_USES)
{
DBG1("optionsfrom called %d times by \"%s\" - looping?", this->nuses + 1, (*argvp)[0]);
return FALSE;
}
fd = fopen(filename, "r");
if (fd == NULL)
{
DBG1("optionsfrom: unable to open file '%s': %s",
filename, strerror(errno));
return FALSE;
}
/* determine the file size */
fseek(fd, 0, SEEK_END);
src.len = ftell(fd);
rewind(fd);
/* allocate one byte more just in case of a missing final newline */
src.ptr = this->buffers[this->nuses] = malloc(src.len + 1);
/* read the whole file into a chunk */
bytes = fread(src.ptr, 1, src.len, fd);
fclose(fd);
if (this->room)
{
newargc = *argcp;
newargv = malloc((newargc + 1 + this->room) * sizeof(char *));
}
else
{
newargc = *argcp + MORE_ARGS;
this->room = MORE_ARGS;
newargv = malloc((newargc + 1) * sizeof(char *));
}
memcpy(newargv, *argvp, optind * sizeof(char *));
next = optind;
newargv[next] = NULL;
while (fetchline(&src, &line) && good)
{
linepos++;
while (eat_whitespace(&line))
{
if (*line.ptr == '"'|| *line.ptr == '\'')
{
char delimiter = *line.ptr;
line.ptr++;
line.len--;
if (!extract_token(&token, delimiter, &line))
{
DBG1("optionsfrom: missing terminator at %s:%d",
filename, linepos);
good = FALSE;
break;
}
}
else
{
if (!extract_token(&token, ' ', &line))
{
/* last token in a line */
token = line;
line.len = 0;
}
}
/* do we have to allocate more memory for additional arguments? */
if (this->room == 0)
{
newargc += MORE_ARGS;
newargv = realloc(newargv, (newargc + 1) * sizeof(char *));
this->room = MORE_ARGS;
}
/* terminate the token by replacing the delimiter with a null character */
*(token.ptr + token.len) = '\0';
/* assign the token to the next argument */
newargv[next] = token.ptr;
next++;
this->room--;
}
}
/* assign newargv to argv */
if (good)
{
memcpy(newargv + next, *argvp + optind, (*argcp + 1 - optind) * sizeof(char *));
*argcp += next - optind;
*argvp = newargv;
}
/* keep a pointer to the latest newargv and free any earlier version */
free(this->newargv);
this->newargv = newargv;
return good;
}
/**
* Defined in header
*/
void destroy(private_options_t *this)
{
while (this->nuses >= 0)
{
free(this->buffers[this->nuses--]);
}
free(this->newargv);
free(this);
}
/*
* Defined in header
*/
options_t *options_create(void)
{
private_options_t *this = malloc_thing(private_options_t);
/* initialize */
this->newargv = NULL;
this->room = 0;
this->nuses = -1;
memset(this->buffers, '\0', MAX_USES);
/* public functions */
this->public.from = (bool (*) (options_t*,char*,int*,char***,int))from;
this->public.destroy = (void (*) (options_t*))destroy;
return &this->public;
}
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