blob: 0530d28c6d672980471a55be1e3c78a0b88b5b87
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 | } |
181 |