yading@11: /*
yading@11:  * Copyright (c) 2012 Stefano Sabatini
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "config.h"
yading@11: #if HAVE_UNISTD_H
yading@11: #include <unistd.h>             /* getopt */
yading@11: #endif
yading@11: 
yading@11: #include "libavutil/log.h"
yading@11: #include "libavutil/bprint.h"
yading@11: 
yading@11: #if !HAVE_GETOPT
yading@11: #include "compat/getopt.c"
yading@11: #endif
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * escaping utility
yading@11:  */
yading@11: 
yading@11: static void usage(void)
yading@11: {
yading@11:     printf("Escape an input string, adopting the av_get_token() escaping logic\n");
yading@11:     printf("usage: ffescape [OPTIONS]\n");
yading@11:     printf("\n"
yading@11:            "Options:\n"
yading@11:            "-e                echo each input line on output\n"
yading@11:            "-f flag           select an escape flag, can assume the values 'whitespace' and 'strict'\n"
yading@11:            "-h                print this help\n"
yading@11:            "-i INFILE         set INFILE as input file, stdin if omitted\n"
yading@11:            "-l LEVEL          set the number of escaping levels, 1 if omitted\n"
yading@11:            "-m ESCAPE_MODE    select escape mode between 'auto', 'backslash', 'quote'\n"
yading@11:            "-o OUTFILE        set OUTFILE as output file, stdout if omitted\n"
yading@11:            "-p PROMPT         set output prompt, is '=> ' by default\n"
yading@11:            "-s SPECIAL_CHARS  set the list of special characters\n");
yading@11: }
yading@11: 
yading@11: int main(int argc, char **argv)
yading@11: {
yading@11:     AVBPrint src;
yading@11:     char *src_buf, *dst_buf;
yading@11:     const char *outfilename = NULL, *infilename = NULL;
yading@11:     FILE *outfile = NULL, *infile = NULL;
yading@11:     const char *prompt = "=> ";
yading@11:     enum AVEscapeMode escape_mode = AV_ESCAPE_MODE_AUTO;
yading@11:     int escape_flags = 0;
yading@11:     int level = 1;
yading@11:     int echo = 0;
yading@11:     char *special_chars = NULL;
yading@11:     int c;
yading@11: 
yading@11:     while ((c = getopt(argc, argv, "ef:hi:l:o:m:p:s:")) != -1) {
yading@11:         switch (c) {
yading@11:         case 'e':
yading@11:             echo = 1;
yading@11:             break;
yading@11:         case 'h':
yading@11:             usage();
yading@11:             return 0;
yading@11:         case 'i':
yading@11:             infilename = optarg;
yading@11:             break;
yading@11:         case 'f':
yading@11:             if      (!strcmp(optarg, "whitespace")) escape_flags |= AV_ESCAPE_FLAG_WHITESPACE;
yading@11:             else if (!strcmp(optarg, "strict"))     escape_flags |= AV_ESCAPE_FLAG_STRICT;
yading@11:             else {
yading@11:                 av_log(NULL, AV_LOG_ERROR,
yading@11:                        "Invalid value '%s' for option -f, "
yading@11:                        "valid arguments are 'whitespace', and 'strict'\n", optarg);
yading@11:                 return 1;
yading@11:             }
yading@11:             break;
yading@11:         case 'l':
yading@11:         {
yading@11:             char *tail;
yading@11:             long int li = strtol(optarg, &tail, 10);
yading@11:             if (*tail || li > INT_MAX || li < 0) {
yading@11:                 av_log(NULL, AV_LOG_ERROR,
yading@11:                         "Invalid value '%s' for option -l, argument must be a non negative integer\n",
yading@11:                         optarg);
yading@11:                 return 1;
yading@11:             }
yading@11:             level = li;
yading@11:             break;
yading@11:         }
yading@11:         case 'm':
yading@11:             if      (!strcmp(optarg, "auto"))      escape_mode = AV_ESCAPE_MODE_AUTO;
yading@11:             else if (!strcmp(optarg, "backslash")) escape_mode = AV_ESCAPE_MODE_BACKSLASH;
yading@11:             else if (!strcmp(optarg, "quote"))     escape_mode = AV_ESCAPE_MODE_QUOTE;
yading@11:             else {
yading@11:                 av_log(NULL, AV_LOG_ERROR,
yading@11:                        "Invalid value '%s' for option -m, "
yading@11:                        "valid arguments are 'backslash', and 'quote'\n", optarg);
yading@11:                 return 1;
yading@11:             }
yading@11:             break;
yading@11:         case 'o':
yading@11:             outfilename = optarg;
yading@11:             break;
yading@11:         case 'p':
yading@11:             prompt = optarg;
yading@11:             break;
yading@11:         case 's':
yading@11:             special_chars = optarg;
yading@11:             break;
yading@11:         case '?':
yading@11:             return 1;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (!infilename || !strcmp(infilename, "-")) {
yading@11:         infilename = "stdin";
yading@11:         infile = stdin;
yading@11:     } else {
yading@11:         infile = fopen(infilename, "r");
yading@11:     }
yading@11:     if (!infile) {
yading@11:         av_log(NULL, AV_LOG_ERROR, "Impossible to open input file '%s': %s\n", infilename, strerror(errno));
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     if (!outfilename || !strcmp(outfilename, "-")) {
yading@11:         outfilename = "stdout";
yading@11:         outfile = stdout;
yading@11:     } else {
yading@11:         outfile = fopen(outfilename, "w");
yading@11:     }
yading@11:     if (!outfile) {
yading@11:         av_log(NULL, AV_LOG_ERROR, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     /* grab the input and store it in src */
yading@11:     av_bprint_init(&src, 1, AV_BPRINT_SIZE_UNLIMITED);
yading@11:     while ((c = fgetc(infile)) != EOF)
yading@11:         av_bprint_chars(&src, c, 1);
yading@11:     av_bprint_chars(&src, 0, 1);
yading@11: 
yading@11:     if (!av_bprint_is_complete(&src)) {
yading@11:         av_log(NULL, AV_LOG_ERROR, "Could not allocate a buffer for the source string\n");
yading@11:         av_bprint_finalize(&src, NULL);
yading@11:         return 1;
yading@11:     }
yading@11:     av_bprint_finalize(&src, &src_buf);
yading@11: 
yading@11:     if (echo)
yading@11:         fprintf(outfile, "%s", src_buf);
yading@11: 
yading@11:     /* escape */
yading@11:     dst_buf = src_buf;
yading@11:     while (level--) {
yading@11:         if (av_escape(&dst_buf, src_buf, special_chars, escape_mode, escape_flags) < 0) {
yading@11:             av_log(NULL, AV_LOG_ERROR, "Could not escape string\n");
yading@11:             return 1;
yading@11:         }
yading@11:         av_free(src_buf);
yading@11:         src_buf = dst_buf;
yading@11:     }
yading@11: 
yading@11:     fprintf(outfile, "%s%s", prompt, dst_buf);
yading@11:     av_free(dst_buf);
yading@11:     return 0;
yading@11: }