2 * Copyright (c) 2012 Stefano Sabatini
4 * This file is part of FFmpeg.
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.
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.
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
23 #include <unistd.h> /* getopt */
26 #include "libavutil/log.h"
27 #include "libavutil/bprint.h"
30 #include "compat/getopt.c"
38 static void usage(void)
40 printf("Escape an input string, adopting the av_get_token() escaping logic\n");
41 printf("usage: ffescape [OPTIONS]\n");
44 "-e echo each input line on output\n"
45 "-h print this help\n"
46 "-i INFILE set INFILE as input file, stdin if omitted\n"
47 "-l LEVEL set the number of escaping levels, 1 if omitted\n"
48 "-m ESCAPE_MODE select escape mode between 'full', 'lazy', 'quote', default is 'lazy'\n"
49 "-o OUTFILE set OUTFILE as output file, stdout if omitted\n"
50 "-p PROMPT set output prompt, is '=> ' by default\n"
51 "-s SPECIAL_CHARS set the list of special characters\n");
54 #define WHITESPACES " \n\t"
62 static int escape(char **dst, const char *src, const char *special_chars,
67 av_bprint_init(&dstbuf, 1, AV_BPRINT_SIZE_UNLIMITED);
70 case ESCAPE_MODE_FULL:
71 case ESCAPE_MODE_LAZY:
72 /* \-escape characters */
74 if (mode == ESCAPE_MODE_LAZY && strchr(WHITESPACES, *src))
75 av_bprintf(&dstbuf, "\\%c", *src++);
78 if ((special_chars && strchr(special_chars, *src)) ||
79 strchr("'\\", *src) ||
80 (mode == ESCAPE_MODE_FULL && strchr(WHITESPACES, *src)))
81 av_bprintf(&dstbuf, "\\%c", *src);
83 av_bprint_chars(&dstbuf, *src, 1);
86 if (mode == ESCAPE_MODE_LAZY && strchr(WHITESPACES, dstbuf.str[dstbuf.len-1])) {
87 char c = dstbuf.str[dstbuf.len-1];
88 dstbuf.str[dstbuf.len-1] = '\\';
89 av_bprint_chars(&dstbuf, c, 1);
93 case ESCAPE_MODE_QUOTE:
94 /* enclose between '' the string */
95 av_bprint_chars(&dstbuf, '\'', 1);
98 av_bprintf(&dstbuf, "'\\''");
100 av_bprint_chars(&dstbuf, *src, 1);
102 av_bprint_chars(&dstbuf, '\'', 1);
106 /* unknown escape mode */
107 return AVERROR(EINVAL);
110 if (!av_bprint_is_complete(&dstbuf)) {
111 av_bprint_finalize(&dstbuf, NULL);
112 return AVERROR(ENOMEM);
114 av_bprint_finalize(&dstbuf, dst);
119 int main(int argc, char **argv)
122 char *src_buf, *dst_buf;
123 const char *outfilename = NULL, *infilename = NULL;
124 FILE *outfile = NULL, *infile = NULL;
125 const char *prompt = "=> ";
126 enum EscapeMode escape_mode = ESCAPE_MODE_LAZY;
129 char *special_chars = NULL;
132 while ((c = getopt(argc, argv, "ehi:l:o:m:p:s:")) != -1) {
146 long int li = strtol(optarg, &tail, 10);
147 if (*tail || li > INT_MAX || li < 0) {
148 av_log(NULL, AV_LOG_ERROR,
149 "Invalid value '%s' for option -l, argument must be a non negative integer\n",
157 if (!strcmp(optarg, "full")) escape_mode = ESCAPE_MODE_FULL;
158 else if (!strcmp(optarg, "lazy")) escape_mode = ESCAPE_MODE_LAZY;
159 else if (!strcmp(optarg, "quote")) escape_mode = ESCAPE_MODE_QUOTE;
161 av_log(NULL, AV_LOG_ERROR,
162 "Invalid value '%s' for option -m, "
163 "valid arguments are 'full', 'lazy', 'quote'\n", optarg);
168 outfilename = optarg;
174 special_chars = optarg;
181 if (!infilename || !strcmp(infilename, "-")) {
182 infilename = "stdin";
185 infile = fopen(infilename, "r");
188 av_log(NULL, AV_LOG_ERROR, "Impossible to open input file '%s': %s\n", infilename, strerror(errno));
192 if (!outfilename || !strcmp(outfilename, "-")) {
193 outfilename = "stdout";
196 outfile = fopen(outfilename, "w");
199 av_log(NULL, AV_LOG_ERROR, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));
203 /* grab the input and store it in src */
204 av_bprint_init(&src, 1, AV_BPRINT_SIZE_UNLIMITED);
205 while ((c = fgetc(infile)) != EOF)
206 av_bprint_chars(&src, c, 1);
207 av_bprint_chars(&src, 0, 1);
209 if (!av_bprint_is_complete(&src)) {
210 av_log(NULL, AV_LOG_ERROR, "Could not allocate a buffer for the source string\n");
211 av_bprint_finalize(&src, NULL);
214 av_bprint_finalize(&src, &src_buf);
217 fprintf(outfile, "%s", src_buf);
222 if (escape(&dst_buf, src_buf, special_chars, escape_mode) < 0) {
223 av_log(NULL, AV_LOG_ERROR, "Could not escape string\n");
230 fprintf(outfile, "%s%s", prompt, dst_buf);