| 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 | #if HAVE_UNISTD_H |
| 23 | #include <unistd.h> /* getopt */ |
| 24 | #endif |
| 25 | |
| 26 | #include "libavutil/log.h" |
| 27 | #include "libavutil/bprint.h" |
| 28 | |
| 29 | #if !HAVE_GETOPT |
| 30 | #include "compat/getopt.c" |
| 31 | #endif |
| 32 | |
| 33 | /** |
| 34 | * @file |
| 35 | * escaping utility |
| 36 | */ |
| 37 | |
| 38 | static void usage(void) |
| 39 | { |
| 40 | printf("Escape an input string, adopting the av_get_token() escaping logic\n"); |
| 41 | printf("usage: ffescape [OPTIONS]\n"); |
| 42 | printf("\n" |
| 43 | "Options:\n" |
| 44 | "-e echo each input line on output\n" |
| 45 | "-f flag select an escape flag, can assume the values 'whitespace' and 'strict'\n" |
| 46 | "-h print this help\n" |
| 47 | "-i INFILE set INFILE as input file, stdin if omitted\n" |
| 48 | "-l LEVEL set the number of escaping levels, 1 if omitted\n" |
| 49 | "-m ESCAPE_MODE select escape mode between 'auto', 'backslash', 'quote'\n" |
| 50 | "-o OUTFILE set OUTFILE as output file, stdout if omitted\n" |
| 51 | "-p PROMPT set output prompt, is '=> ' by default\n" |
| 52 | "-s SPECIAL_CHARS set the list of special characters\n"); |
| 53 | } |
| 54 | |
| 55 | int main(int argc, char **argv) |
| 56 | { |
| 57 | AVBPrint src; |
| 58 | char *src_buf, *dst_buf; |
| 59 | const char *outfilename = NULL, *infilename = NULL; |
| 60 | FILE *outfile = NULL, *infile = NULL; |
| 61 | const char *prompt = "=> "; |
| 62 | enum AVEscapeMode escape_mode = AV_ESCAPE_MODE_AUTO; |
| 63 | int escape_flags = 0; |
| 64 | int level = 1; |
| 65 | int echo = 0; |
| 66 | char *special_chars = NULL; |
| 67 | int c; |
| 68 | |
| 69 | while ((c = getopt(argc, argv, "ef:hi:l:o:m:p:s:")) != -1) { |
| 70 | switch (c) { |
| 71 | case 'e': |
| 72 | echo = 1; |
| 73 | break; |
| 74 | case 'h': |
| 75 | usage(); |
| 76 | return 0; |
| 77 | case 'i': |
| 78 | infilename = optarg; |
| 79 | break; |
| 80 | case 'f': |
| 81 | if (!strcmp(optarg, "whitespace")) escape_flags |= AV_ESCAPE_FLAG_WHITESPACE; |
| 82 | else if (!strcmp(optarg, "strict")) escape_flags |= AV_ESCAPE_FLAG_STRICT; |
| 83 | else { |
| 84 | av_log(NULL, AV_LOG_ERROR, |
| 85 | "Invalid value '%s' for option -f, " |
| 86 | "valid arguments are 'whitespace', and 'strict'\n", optarg); |
| 87 | return 1; |
| 88 | } |
| 89 | break; |
| 90 | case 'l': |
| 91 | { |
| 92 | char *tail; |
| 93 | long int li = strtol(optarg, &tail, 10); |
| 94 | if (*tail || li > INT_MAX || li < 0) { |
| 95 | av_log(NULL, AV_LOG_ERROR, |
| 96 | "Invalid value '%s' for option -l, argument must be a non negative integer\n", |
| 97 | optarg); |
| 98 | return 1; |
| 99 | } |
| 100 | level = li; |
| 101 | break; |
| 102 | } |
| 103 | case 'm': |
| 104 | if (!strcmp(optarg, "auto")) escape_mode = AV_ESCAPE_MODE_AUTO; |
| 105 | else if (!strcmp(optarg, "backslash")) escape_mode = AV_ESCAPE_MODE_BACKSLASH; |
| 106 | else if (!strcmp(optarg, "quote")) escape_mode = AV_ESCAPE_MODE_QUOTE; |
| 107 | else { |
| 108 | av_log(NULL, AV_LOG_ERROR, |
| 109 | "Invalid value '%s' for option -m, " |
| 110 | "valid arguments are 'backslash', and 'quote'\n", optarg); |
| 111 | return 1; |
| 112 | } |
| 113 | break; |
| 114 | case 'o': |
| 115 | outfilename = optarg; |
| 116 | break; |
| 117 | case 'p': |
| 118 | prompt = optarg; |
| 119 | break; |
| 120 | case 's': |
| 121 | special_chars = optarg; |
| 122 | break; |
| 123 | case '?': |
| 124 | return 1; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | if (!infilename || !strcmp(infilename, "-")) { |
| 129 | infilename = "stdin"; |
| 130 | infile = stdin; |
| 131 | } else { |
| 132 | infile = fopen(infilename, "r"); |
| 133 | } |
| 134 | if (!infile) { |
| 135 | av_log(NULL, AV_LOG_ERROR, "Impossible to open input file '%s': %s\n", infilename, strerror(errno)); |
| 136 | return 1; |
| 137 | } |
| 138 | |
| 139 | if (!outfilename || !strcmp(outfilename, "-")) { |
| 140 | outfilename = "stdout"; |
| 141 | outfile = stdout; |
| 142 | } else { |
| 143 | outfile = fopen(outfilename, "w"); |
| 144 | } |
| 145 | if (!outfile) { |
| 146 | av_log(NULL, AV_LOG_ERROR, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno)); |
| 147 | return 1; |
| 148 | } |
| 149 | |
| 150 | /* grab the input and store it in src */ |
| 151 | av_bprint_init(&src, 1, AV_BPRINT_SIZE_UNLIMITED); |
| 152 | while ((c = fgetc(infile)) != EOF) |
| 153 | av_bprint_chars(&src, c, 1); |
| 154 | av_bprint_chars(&src, 0, 1); |
| 155 | |
| 156 | if (!av_bprint_is_complete(&src)) { |
| 157 | av_log(NULL, AV_LOG_ERROR, "Could not allocate a buffer for the source string\n"); |
| 158 | av_bprint_finalize(&src, NULL); |
| 159 | return 1; |
| 160 | } |
| 161 | av_bprint_finalize(&src, &src_buf); |
| 162 | |
| 163 | if (echo) |
| 164 | fprintf(outfile, "%s", src_buf); |
| 165 | |
| 166 | /* escape */ |
| 167 | dst_buf = src_buf; |
| 168 | while (level--) { |
| 169 | if (av_escape(&dst_buf, src_buf, special_chars, escape_mode, escape_flags) < 0) { |
| 170 | av_log(NULL, AV_LOG_ERROR, "Could not escape string\n"); |
| 171 | return 1; |
| 172 | } |
| 173 | av_free(src_buf); |
| 174 | src_buf = dst_buf; |
| 175 | } |
| 176 | |
| 177 | fprintf(outfile, "%s%s", prompt, dst_buf); |
| 178 | av_free(dst_buf); |
| 179 | return 0; |
| 180 | } |