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/*

 * Copyright (c) 2012 Stefano Sabatini

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include "config.h"

#if HAVE_UNISTD_H

#include              /* getopt */

#endif

#include "libavutil/log.h"

#include "libavutil/bprint.h"

#if !HAVE_GETOPT

#include "compat/getopt.c"

#endif

/**

 * @file

 * escaping utility

 */

static void usage(void)

{

    printf("Escape an input string, adopting the av_get_token() escaping logic\n");

    printf("usage: ffescape [OPTIONS]\n");

    printf("\n"

           "Options:\n"

           "-e                echo each input line on output\n"

           "-f flag           select an escape flag, can assume the values 'whitespace' and 'strict'\n"

           "-h                print this help\n"

           "-i INFILE         set INFILE as input file, stdin if omitted\n"

           "-l LEVEL          set the number of escaping levels, 1 if omitted\n"

           "-m ESCAPE_MODE    select escape mode between 'auto', 'backslash', 'quote'\n"

           "-o OUTFILE        set OUTFILE as output file, stdout if omitted\n"

           "-p PROMPT         set output prompt, is '=> ' by default\n"

           "-s SPECIAL_CHARS  set the list of special characters\n");

}

int main(int argc, char **argv)

{

    AVBPrint src;

    char *src_buf, *dst_buf;

    const char *outfilename = NULL, *infilename = NULL;

    FILE *outfile = NULL, *infile = NULL;

    const char *prompt = "=> ";

    enum AVEscapeMode escape_mode = AV_ESCAPE_MODE_AUTO;

    int escape_flags = 0;

    int level = 1;

    int echo = 0;

    char *special_chars = NULL;

    int c;

    while ((c = getopt(argc, argv, "ef:hi:l:o:m:p:s:")) != -1) {

        switch (c) {

        case 'e':

            echo = 1;

            break;

        case 'h':

            usage();

            return 0;

        case 'i':

            infilename = optarg;

            break;

        case 'f':

            if      (!strcmp(optarg, "whitespace")) escape_flags |= AV_ESCAPE_FLAG_WHITESPACE;

            else if (!strcmp(optarg, "strict"))     escape_flags |= AV_ESCAPE_FLAG_STRICT;

            else {

                av_log(NULL, AV_LOG_ERROR,

                       "Invalid value '%s' for option -f, "

                       "valid arguments are 'whitespace', and 'strict'\n", optarg);

                return 1;

            }

            break;

        case 'l':

        {

            char *tail;

            long int li = strtol(optarg, &tail, 10);

            if (*tail || li > INT_MAX || li < 0) {

                av_log(NULL, AV_LOG_ERROR,

                        "Invalid value '%s' for option -l, argument must be a non negative integer\n",

                        optarg);

                return 1;

            }

            level = li;

            break;

        }

        case 'm':

            if      (!strcmp(optarg, "auto"))      escape_mode = AV_ESCAPE_MODE_AUTO;

            else if (!strcmp(optarg, "backslash")) escape_mode = AV_ESCAPE_MODE_BACKSLASH;

            else if (!strcmp(optarg, "quote"))     escape_mode = AV_ESCAPE_MODE_QUOTE;

            else {

                av_log(NULL, AV_LOG_ERROR,

                       "Invalid value '%s' for option -m, "

                       "valid arguments are 'backslash', and 'quote'\n", optarg);

                return 1;

            }

            break;

        case 'o':

            outfilename = optarg;

            break;

        case 'p':

            prompt = optarg;

            break;

        case 's':

            special_chars = optarg;

            break;

        case '?':

            return 1;

        }

    }

    if (!infilename || !strcmp(infilename, "-")) {

        infilename = "stdin";

        infile = stdin;

    } else {

        infile = fopen(infilename, "r");

    }

    if (!infile) {

        av_log(NULL, AV_LOG_ERROR, "Impossible to open input file '%s': %s\n", infilename, strerror(errno));

        return 1;

    }

    if (!outfilename || !strcmp(outfilename, "-")) {

        outfilename = "stdout";

        outfile = stdout;

    } else {

        outfile = fopen(outfilename, "w");

    }

    if (!outfile) {

        av_log(NULL, AV_LOG_ERROR, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));

        return 1;

    }

    /* grab the input and store it in src */

    av_bprint_init(&src, 1, AV_BPRINT_SIZE_UNLIMITED);

    while ((c = fgetc(infile)) != EOF)

        av_bprint_chars(&src, c, 1);

    av_bprint_chars(&src, 0, 1);

    if (!av_bprint_is_complete(&src)) {

        av_log(NULL, AV_LOG_ERROR, "Could not allocate a buffer for the source string\n");

        av_bprint_finalize(&src, NULL);

        return 1;

    }

    av_bprint_finalize(&src, &src_buf);

    if (echo)

        fprintf(outfile, "%s", src_buf);

    /* escape */

    dst_buf = src_buf;

    while (level--) {

        if (av_escape(&dst_buf, src_buf, special_chars, escape_mode, escape_flags) < 0) {

            av_log(NULL, AV_LOG_ERROR, "Could not escape string\n");

            return 1;

        }

        av_free(src_buf);

        src_buf = dst_buf;

    }

    fprintf(outfile, "%s%s", prompt, dst_buf);

    av_free(dst_buf);

    return 0;

}