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/**
* @file optionsfrom.c
*
* @brief read command line options from a file
*
*/
/*
* Copyright (C) 1998, 1999 Henry Spencer.
*
* 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 <library.h>
#include <utils/lexparser.h>
#include "optionsfrom.h"
#define MAX_USES 100 /* loop-detection limit */
#define SOME_ARGS 10 /* first guess at how many arguments we'll need */
/**
* parse the options from a file
* does not alter the existing arguments, but does relocate and alter
* the argv pointer vector.
*/
static err_t parse_options_file(const char *filename, int *argcp, char **argvp[], int optind)
{
char **newargv;
int newargc;
int next; /* place for next argument */
int room; /* how many more new arguments we can hold */
size_t bytes;
chunk_t chunk, src, line, token;
err_t ugh = NULL;
FILE *fd = fopen(filename, "r");
if (fd == NULL)
{
return "unable to open file";
}
/* determine the file size */
fseek(fd, 0, SEEK_END);
chunk.len = ftell(fd);
rewind(fd);
/* allocate one byte more just in case of a missing final newline */
chunk.ptr = malloc(chunk.len + 1);
/* read the whole file into a chunk */
bytes = fread(chunk.ptr, 1, chunk.len, fd);
fclose(fd);
newargc = *argcp + SOME_ARGS;
newargv = malloc((newargc + 1) * sizeof(char *));
memcpy(newargv, *argvp, optind * sizeof(char *));
room = SOME_ARGS;
next = optind;
newargv[next] = NULL;
/* we keep the chunk pointer so that we can still free it */
src = chunk;
while (fetchline(&src, &line) && ugh == NULL)
{
while (eat_whitespace(&line))
{
if (*line.ptr == '"'|| *line.ptr == '\'')
{
char delimiter = *line.ptr;
line.ptr++;
line.len--;
if (!extract_token(&token, delimiter, &line))
{
ugh = "missing terminating delimiter";
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 (room == 0)
{
newargc += SOME_ARGS;
newargv = realloc(newargv, (newargc+1) * sizeof(char *));
room = SOME_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++;
room--;
}
}
if (ugh) /* error of some kind */
{
free(chunk.ptr);
free(newargv);
return ugh;
}
memcpy(newargv + next, *argvp + optind, (*argcp + 1 - optind) * sizeof(char *));
*argcp += next - optind;
*argvp = newargv;
return NULL;
}
/*
* Defined in header.
*/
err_t optionsfrom(const char *filename, int *argcp, char **argvp[], int optind, FILE *errfile)
{
static int nuses = 0;
err_t ugh = NULL;
/* avoid endless loops with recursive --optionsfrom arguments */
if (errfile != NULL)
{
nuses++;
if (nuses >= MAX_USES)
{
fprintf(errfile, "%s: optionsfrom called %d times - looping?\n",
(*argvp)[0], nuses);
exit(2);
}
}
else
{
nuses = 0;
}
ugh = parse_options_file(filename, argcp, argvp, optind);
if (ugh != NULL && errfile != NULL)
{
fprintf(errfile, "%s: optionsfrom failed: %s\n", (*argvp)[0], ugh);
exit(2);
}
return ugh;
}
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