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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 | } |