1 files changed, 139 insertions, 0 deletions
diff --git a/tools/ffeval.c b/tools/ffeval.c
new file mode 100644
index 0000000..944f374
--- /dev/null
+++ 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;
+}