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/* Iterate over arguments from argv or --files0-from=FILE
Copyright (C) 2008-2020 Free Software Foundation, Inc.
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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Jim Meyering. */
#include <config.h>
#include "argv-iter.h"
#include <stdlib.h>
#include <string.h>
struct argv_iterator
{
/* Test FP to determine whether in read-mode or argv-mode. */
/* file-mode: fp records position */
FILE *fp;
size_t item_idx;
char *tok;
size_t buf_len;
/* argv-mode: record just argv and current pointer */
char **arg_list;
char **p;
};
struct argv_iterator *
argv_iter_init_argv (char **argv)
{
struct argv_iterator *ai = malloc (sizeof *ai);
if (!ai)
return NULL;
ai->fp = NULL;
ai->arg_list = argv;
ai->p = argv;
return ai;
}
/* Initialize to read from the stream, FP.
The input is expected to contain a list of NUL-delimited tokens. */
struct argv_iterator *
argv_iter_init_stream (FILE *fp)
{
struct argv_iterator *ai = malloc (sizeof *ai);
if (!ai)
return NULL;
ai->fp = fp;
ai->tok = NULL;
ai->buf_len = 0;
ai->item_idx = 0;
ai->arg_list = NULL;
return ai;
}
char *
argv_iter (struct argv_iterator *ai, enum argv_iter_err *err)
{
if (ai->fp)
{
ssize_t len = getdelim (&ai->tok, &ai->buf_len, '\0', ai->fp);
if (len < 0)
{
*err = feof (ai->fp) ? AI_ERR_EOF : AI_ERR_READ;
return NULL;
}
*err = AI_ERR_OK;
ai->item_idx++;
return ai->tok;
}
else
{
if (*(ai->p) == NULL)
{
*err = AI_ERR_EOF;
return NULL;
}
else
{
*err = AI_ERR_OK;
return *(ai->p++);
}
}
}
size_t
argv_iter_n_args (struct argv_iterator const *ai)
{
return ai->fp ? ai->item_idx : ai->p - ai->arg_list;
}
void
argv_iter_free (struct argv_iterator *ai)
{
if (ai->fp)
free (ai->tok);
free (ai);
}
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