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2ba45a60 DM |
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/eval.h" | |
27 | #include "libavutil/mem.h" | |
28 | ||
29 | #if !HAVE_GETOPT | |
30 | #include "compat/getopt.c" | |
31 | #endif | |
32 | ||
33 | /** | |
34 | * @file | |
35 | * simple arithmetic expression evaluator | |
36 | */ | |
37 | ||
38 | static void usage(void) | |
39 | { | |
40 | printf("Simple expression evalutor, please *don't* turn me to a feature-complete language interpreter\n"); | |
41 | printf("usage: ffeval [OPTIONS]\n"); | |
42 | printf("\n" | |
43 | "Options:\n" | |
44 | "-e echo each input line on output\n" | |
45 | "-h print this help\n" | |
46 | "-i INFILE set INFILE as input file, stdin if omitted\n" | |
47 | "-o OUTFILE set OUTFILE as output file, stdout if omitted\n" | |
48 | "-p PROMPT set output prompt\n"); | |
49 | } | |
50 | ||
51 | int main(int argc, char **argv) | |
52 | { | |
53 | int buf_size = 0; | |
54 | char *buf = NULL; | |
55 | const char *outfilename = NULL, *infilename = NULL; | |
56 | FILE *outfile = NULL, *infile = NULL; | |
57 | const char *prompt = "=> "; | |
58 | int count = 0, echo = 0; | |
59 | int c; | |
60 | ||
61 | #define GROW_ARRAY() \ | |
62 | do { \ | |
63 | if (!av_dynarray2_add((void **)&buf, &buf_size, 1, NULL)) { \ | |
64 | av_log(NULL, AV_LOG_ERROR, \ | |
65 | "Memory allocation problem occurred\n"); \ | |
66 | return 1; \ | |
67 | } \ | |
68 | } while (0) | |
69 | ||
70 | GROW_ARRAY(); | |
71 | while ((c = getopt(argc, argv, "ehi:o:p:")) != -1) { | |
72 | switch (c) { | |
73 | case 'e': | |
74 | echo = 1; | |
75 | break; | |
76 | case 'h': | |
77 | usage(); | |
78 | return 0; | |
79 | case 'i': | |
80 | infilename = optarg; | |
81 | break; | |
82 | case 'o': | |
83 | outfilename = optarg; | |
84 | break; | |
85 | case 'p': | |
86 | prompt = optarg; | |
87 | break; | |
88 | case '?': | |
89 | return 1; | |
90 | } | |
91 | } | |
92 | ||
93 | if (!infilename || !strcmp(infilename, "-")) { | |
94 | infilename = "stdin"; | |
95 | infile = stdin; | |
96 | } else { | |
97 | infile = fopen(infilename, "r"); | |
98 | } | |
99 | if (!infile) { | |
100 | fprintf(stderr, "Impossible to open input file '%s': %s\n", infilename, strerror(errno)); | |
101 | return 1; | |
102 | } | |
103 | ||
104 | if (!outfilename || !strcmp(outfilename, "-")) { | |
105 | outfilename = "stdout"; | |
106 | outfile = stdout; | |
107 | } else { | |
108 | outfile = fopen(outfilename, "w"); | |
109 | } | |
110 | if (!outfile) { | |
111 | fprintf(stderr, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno)); | |
112 | return 1; | |
113 | } | |
114 | ||
115 | while ((c = fgetc(infile)) != EOF) { | |
116 | if (c == '\n') { | |
117 | double d; | |
118 | ||
119 | buf[count] = 0; | |
120 | if (buf[0] != '#') { | |
121 | int ret = av_expr_parse_and_eval(&d, buf, | |
122 | NULL, NULL, | |
123 | NULL, NULL, NULL, NULL, NULL, 0, NULL); | |
124 | if (echo) | |
125 | fprintf(outfile, "%s ", buf); | |
126 | if (ret >= 0) fprintf(outfile, "%s%f\n", prompt, d); | |
127 | else fprintf(outfile, "%s%f (%s)\n", prompt, d, av_err2str(ret)); | |
128 | } | |
129 | count = 0; | |
130 | } else { | |
131 | if (count >= buf_size-1) | |
132 | GROW_ARRAY(); | |
133 | buf[count++] = c; | |
134 | } | |
135 | } | |
136 | ||
137 | av_free(buf); | |
138 | return 0; | |
139 | } |