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