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+/*
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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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+
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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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+
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+#include "libavutil/log.h"
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+#include "libavutil/bprint.h"
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+
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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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+/**
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+ * @file
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+ * escaping utility
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+ */
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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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+ "-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 'full', 'lazy', 'quote', default is 'lazy'\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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+
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+#define WHITESPACES " \n\t"
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+
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+enum EscapeMode {
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+ ESCAPE_MODE_FULL,
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+ ESCAPE_MODE_LAZY,
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+ ESCAPE_MODE_QUOTE,
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+};
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+
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+static int escape(char **dst, const char *src, const char *special_chars,
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+ enum EscapeMode mode)
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+{
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+ AVBPrint dstbuf;
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+
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+ av_bprint_init(&dstbuf, 1, AV_BPRINT_SIZE_UNLIMITED);
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+
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+ switch (mode) {
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+ case ESCAPE_MODE_FULL:
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+ case ESCAPE_MODE_LAZY:
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+ /* \-escape characters */
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+
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+ if (mode == ESCAPE_MODE_LAZY && strchr(WHITESPACES, *src))
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+ av_bprintf(&dstbuf, "\\%c", *src++);
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+
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+ for (; *src; src++) {
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+ if ((special_chars && strchr(special_chars, *src)) ||
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+ strchr("'\\", *src) ||
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+ (mode == ESCAPE_MODE_FULL && strchr(WHITESPACES, *src)))
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+ av_bprintf(&dstbuf, "\\%c", *src);
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+ else
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+ av_bprint_chars(&dstbuf, *src, 1);
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+ }
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+
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+ if (mode == ESCAPE_MODE_LAZY && strchr(WHITESPACES, dstbuf.str[dstbuf.len-1])) {
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+ char c = dstbuf.str[dstbuf.len-1];
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+ dstbuf.str[dstbuf.len-1] = '\\';
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+ av_bprint_chars(&dstbuf, c, 1);
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+ }
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+ break;
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+
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+ case ESCAPE_MODE_QUOTE:
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+ /* enclose between '' the string */
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+ av_bprint_chars(&dstbuf, '\'', 1);
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+ for (; *src; src++) {
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+ if (*src == '\'')
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+ av_bprintf(&dstbuf, "'\\''");
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+ else
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+ av_bprint_chars(&dstbuf, *src, 1);
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+ }
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+ av_bprint_chars(&dstbuf, '\'', 1);
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+ break;
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+
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+ default:
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+ /* unknown escape mode */
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+ return AVERROR(EINVAL);
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+ }
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+
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+ if (!av_bprint_is_complete(&dstbuf)) {
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+ av_bprint_finalize(&dstbuf, NULL);
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+ return AVERROR(ENOMEM);
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+ } else {
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+ av_bprint_finalize(&dstbuf, dst);
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+ return 0;
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+ }
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+}
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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 EscapeMode escape_mode = ESCAPE_MODE_LAZY;
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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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+
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+ while ((c = getopt(argc, argv, "ehi: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 '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, "full")) escape_mode = ESCAPE_MODE_FULL;
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+ else if (!strcmp(optarg, "lazy")) escape_mode = ESCAPE_MODE_LAZY;
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+ else if (!strcmp(optarg, "quote")) escape_mode = 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 'full', 'lazy', '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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+
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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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+
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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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+
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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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+
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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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+
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+ if (echo)
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+ fprintf(outfile, "%s", src_buf);
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+
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+ /* escape */
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+ dst_buf = src_buf;
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+ while (level--) {
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+ if (escape(&dst_buf, src_buf, special_chars, escape_mode) < 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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+
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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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Stefano Sabatini