1/* 2 * Copyright (c) 2012 Stefano Sabatini 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include "config.h" 22#include <errno.h> 23#include <limits.h> 24#include <stdio.h> 25#include <stdlib.h> 26#include <string.h> 27#if HAVE_UNISTD_H 28#include <unistd.h> /* getopt */ 29#endif 30 31#include "libavutil/log.h" 32#include "libavutil/bprint.h" 33#include "libavutil/mem.h" 34 35#if !HAVE_GETOPT 36#include "compat/getopt.c" 37#endif 38 39/** 40 * @file 41 * escaping utility 42 */ 43 44static void usage(void) 45{ 46 printf("Escape an input string, adopting the av_get_token() escaping logic\n"); 47 printf("usage: ffescape [OPTIONS]\n"); 48 printf("\n" 49 "Options:\n" 50 "-e echo each input line on output\n" 51 "-f flag select an escape flag, can assume the values 'whitespace' and 'strict'\n" 52 "-h print this help\n" 53 "-i INFILE set INFILE as input file, stdin if omitted\n" 54 "-l LEVEL set the number of escaping levels, 1 if omitted\n" 55 "-m ESCAPE_MODE select escape mode between 'auto', 'backslash', 'quote'\n" 56 "-o OUTFILE set OUTFILE as output file, stdout if omitted\n" 57 "-p PROMPT set output prompt, is '=> ' by default\n" 58 "-s SPECIAL_CHARS set the list of special characters\n"); 59} 60 61int main(int argc, char **argv) 62{ 63 AVBPrint src; 64 char *src_buf, *dst_buf; 65 const char *outfilename = NULL, *infilename = NULL; 66 FILE *outfile = NULL, *infile = NULL; 67 const char *prompt = "=> "; 68 enum AVEscapeMode escape_mode = AV_ESCAPE_MODE_AUTO; 69 int escape_flags = 0; 70 int level = 1; 71 int echo = 0; 72 char *special_chars = NULL; 73 int c; 74 75 while ((c = getopt(argc, argv, "ef:hi:l:o:m:p:s:")) != -1) { 76 switch (c) { 77 case 'e': 78 echo = 1; 79 break; 80 case 'h': 81 usage(); 82 return 0; 83 case 'i': 84 infilename = optarg; 85 break; 86 case 'f': 87 if (!strcmp(optarg, "whitespace")) escape_flags |= AV_ESCAPE_FLAG_WHITESPACE; 88 else if (!strcmp(optarg, "strict")) escape_flags |= AV_ESCAPE_FLAG_STRICT; 89 else if (!strcmp(optarg, "xml_single_quotes")) escape_flags |= AV_ESCAPE_FLAG_XML_SINGLE_QUOTES; 90 else if (!strcmp(optarg, "xml_double_quotes")) escape_flags |= AV_ESCAPE_FLAG_XML_DOUBLE_QUOTES; 91 else { 92 av_log(NULL, AV_LOG_ERROR, 93 "Invalid value '%s' for option -f, " 94 "valid arguments are 'whitespace', and 'strict'\n", optarg); 95 return 1; 96 } 97 break; 98 case 'l': 99 { 100 char *tail; 101 long int li = strtol(optarg, &tail, 10); 102 if (*tail || li > INT_MAX || li < 0) { 103 av_log(NULL, AV_LOG_ERROR, 104 "Invalid value '%s' for option -l, argument must be a non negative integer\n", 105 optarg); 106 return 1; 107 } 108 level = li; 109 break; 110 } 111 case 'm': 112 if (!strcmp(optarg, "auto")) escape_mode = AV_ESCAPE_MODE_AUTO; 113 else if (!strcmp(optarg, "backslash")) escape_mode = AV_ESCAPE_MODE_BACKSLASH; 114 else if (!strcmp(optarg, "quote")) escape_mode = AV_ESCAPE_MODE_QUOTE; 115 else if (!strcmp(optarg, "xml")) escape_mode = AV_ESCAPE_MODE_XML; 116 else { 117 av_log(NULL, AV_LOG_ERROR, 118 "Invalid value '%s' for option -m, " 119 "valid arguments are 'backslash', and 'quote'\n", optarg); 120 return 1; 121 } 122 break; 123 case 'o': 124 outfilename = optarg; 125 break; 126 case 'p': 127 prompt = optarg; 128 break; 129 case 's': 130 special_chars = optarg; 131 break; 132 case '?': 133 return 1; 134 } 135 } 136 137 if (!infilename || !strcmp(infilename, "-")) { 138 infilename = "stdin"; 139 infile = stdin; 140 } else { 141 infile = fopen(infilename, "r"); 142 } 143 if (!infile) { 144 av_log(NULL, AV_LOG_ERROR, "Impossible to open input file '%s': %s\n", infilename, strerror(errno)); 145 return 1; 146 } 147 148 if (!outfilename || !strcmp(outfilename, "-")) { 149 outfilename = "stdout"; 150 outfile = stdout; 151 } else { 152 outfile = fopen(outfilename, "w"); 153 } 154 if (!outfile) { 155 av_log(NULL, AV_LOG_ERROR, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno)); 156 return 1; 157 } 158 159 /* grab the input and store it in src */ 160 av_bprint_init(&src, 1, AV_BPRINT_SIZE_UNLIMITED); 161 while ((c = fgetc(infile)) != EOF) 162 av_bprint_chars(&src, c, 1); 163 av_bprint_chars(&src, 0, 1); 164 165 if (!av_bprint_is_complete(&src)) { 166 av_log(NULL, AV_LOG_ERROR, "Could not allocate a buffer for the source string\n"); 167 av_bprint_finalize(&src, NULL); 168 return 1; 169 } 170 av_bprint_finalize(&src, &src_buf); 171 172 if (echo) 173 fprintf(outfile, "%s", src_buf); 174 175 /* escape */ 176 dst_buf = src_buf; 177 while (level--) { 178 if (av_escape(&dst_buf, src_buf, special_chars, escape_mode, escape_flags) < 0) { 179 av_log(NULL, AV_LOG_ERROR, "Could not escape string\n"); 180 return 1; 181 } 182 av_free(src_buf); 183 src_buf = dst_buf; 184 } 185 186 fprintf(outfile, "%s%s", prompt, dst_buf); 187 av_free(dst_buf); 188 return 0; 189} 190