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