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/* This file is part of GDBM, the GNU data base manager.
Copyright (C) 2018-2025 Free Software Foundation, Inc.
GDBM 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 3, or (at your option)
any later version.
GDBM 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 GDBM. If not, see <http://www.gnu.org/licenses/>. */
#include "gdbmtool.h"
#include <stdlib.h>
struct instream_argv
{
struct instream base; /* Base structure */
int argc; /* Number of arguments */
char **argv; /* Vector of arguments */
int idx; /* Index of the current argument */
char *cur; /* Current position in argv[idx] */
int delim; /* True if cur points to a delimiter */
int quote; /* True if the argument must be quoted */
};
static ssize_t
instream_argv_read (instream_t istr, char *buf, size_t size)
{
size_t total = 0;
struct instream_argv *i = (struct instream_argv*)istr;
char const specials[] = " \"\t\n[]{},";
char const escapable[] = "\\\"";
while (total < size)
{
if (*i->cur == 0)
{
if (i->quote)
{
buf[total++] = '"';
i->quote = 0;
continue;
}
if (i->idx == i->argc)
{
if (!i->delim)
{
i->cur = "\n";
i->delim = 1;
}
else
break;
}
else if (!i->delim)
{
i->cur = " ";
i->delim = 1;
}
else
{
size_t len;
i->cur = i->argv[i->idx++];
i->delim = 0;
len = strlen (i->cur);
if (len > 1 && i->cur[0] == '"' && i->cur[len-1] == '"')
i->quote = 0;
else if (i->cur[strcspn (i->cur, specials)])
{
buf[total++] = '"';
i->quote = 1;
continue;
}
else
i->quote = 0;
}
}
if (strchr (escapable, *i->cur))
{
if (total + 2 > size)
break;
buf[total++] = '\\';
}
buf[total++] = *i->cur++;
}
return total;
}
static void
instream_argv_close (instream_t istr)
{
struct instream_argv *i = (struct instream_argv *)istr;
free (i);
}
static int
instream_argv_eq (instream_t a, instream_t b)
{
return 0;
}
instream_t
instream_argv_create (int argc, char **argv)
{
struct instream_argv *istr;
istr = emalloc (sizeof *istr);
istr->base.in_name = "argv";
istr->base.in_inter = 0;
istr->base.in_read = instream_argv_read;
istr->base.in_close = instream_argv_close;
istr->base.in_eq = instream_argv_eq;
istr->base.in_history_size = NULL;
istr->base.in_history_get = NULL;
istr->argc = argc;
istr->argv = argv;
istr->idx = 0;
istr->cur = "";
istr->delim = 1;
istr->quote = 0;
return (instream_t) istr;
}
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