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-rw-r--r--tools/ffeval.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/tools/ffeval.c b/tools/ffeval.c
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+++ b/tools/ffeval.c
@@ -0,0 +1,139 @@
+/*
+ * 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/eval.h"
+#include "libavutil/mem.h"
+
+#if !HAVE_GETOPT
+#include "compat/getopt.c"
+#endif
+
+/**
+ * @file
+ * simple arithmetic expression evaluator
+ */
+
+static void usage(void)
+{
+ printf("Simple expression evalutor, please *don't* turn me to a feature-complete language interpreter\n");
+ printf("usage: ffeval [OPTIONS]\n");
+ printf("\n"
+ "Options:\n"
+ "-e echo each input line on output\n"
+ "-h print this help\n"
+ "-i INFILE set INFILE as input file, stdin if omitted\n"
+ "-o OUTFILE set OUTFILE as output file, stdout if omitted\n"
+ "-p PROMPT set output prompt\n");
+}
+
+int main(int argc, char **argv)
+{
+ int buf_size = 0;
+ char *buf = NULL;
+ const char *outfilename = NULL, *infilename = NULL;
+ FILE *outfile = NULL, *infile = NULL;
+ const char *prompt = "=> ";
+ int count = 0, echo = 0;
+ int c;
+
+#define GROW_ARRAY() \
+ do { \
+ if (!av_dynarray2_add((void **)&buf, &buf_size, 1, NULL)) { \
+ av_log(NULL, AV_LOG_ERROR, \
+ "Memory allocation problem occurred\n"); \
+ return 1; \
+ } \
+ } while (0)
+
+ GROW_ARRAY();
+ while ((c = getopt(argc, argv, "ehi:o:p:")) != -1) {
+ switch (c) {
+ case 'e':
+ echo = 1;
+ break;
+ case 'h':
+ usage();
+ return 0;
+ case 'i':
+ infilename = optarg;
+ break;
+ case 'o':
+ outfilename = optarg;
+ break;
+ case 'p':
+ prompt = optarg;
+ break;
+ case '?':
+ return 1;
+ }
+ }
+
+ if (!infilename || !strcmp(infilename, "-")) {
+ infilename = "stdin";
+ infile = stdin;
+ } else {
+ infile = fopen(infilename, "r");
+ }
+ if (!infile) {
+ fprintf(stderr, "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) {
+ fprintf(stderr, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));
+ return 1;
+ }
+
+ while ((c = fgetc(infile)) != EOF) {
+ if (c == '\n') {
+ double d;
+
+ buf[count] = 0;
+ if (buf[0] != '#') {
+ int ret = av_expr_parse_and_eval(&d, buf,
+ NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, 0, NULL);
+ if (echo)
+ fprintf(outfile, "%s ", buf);
+ if (ret >= 0) fprintf(outfile, "%s%f\n", prompt, d);
+ else fprintf(outfile, "%s%f (%s)\n", prompt, d, av_err2str(ret));
+ }
+ count = 0;
+ } else {
+ if (count >= buf_size-1)
+ GROW_ARRAY();
+ buf[count++] = c;
+ }
+ }
+
+ av_free(buf);
+ return 0;
+}