mixer library split into separate headers and name consistently

src/lib/mixer/load_mixer_file.cpp

@@ -0,0 +1,112 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file mixer_load.c
+ *
+ * Programmable multi-channel mixer library.
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#include "mixer_load.h"
+
+int load_mixer_file(const char *fname, char *buf, unsigned maxlen)
+{
+	FILE		*fp;
+	char		line[120];
+
+	/* open the mixer definition file */
+	fp = fopen(fname, "r");
+
+	if (fp == NULL) {
+		printf("file not found\n");
+		return -1;
+	}
+
+	/* read valid lines from the file into a buffer */
+	buf[0] = '\0';
+
+	for (;;) {
+
+		/* get a line, bail on error/EOF */
+		line[0] = '\0';
+
+		if (fgets(line, sizeof(line), fp) == NULL) {
+			break;
+		}
+
+		/* if the line doesn't look like a mixer definition line, skip it */
+		if ((strlen(line) < 2) || !isupper(line[0]) || (line[1] != ':')) {
+			continue;
+		}
+
+		/* compact whitespace in the buffer */
+		char *t, *f;
+
+		for (f = line; *f != '\0'; f++) {
+			/* scan for space characters */
+			if (*f == ' ') {
+				/* look for additional spaces */
+				t = f + 1;
+
+				while (*t == ' ') {
+					t++;
+				}
+
+				if (*t == '\0') {
+					/* strip trailing whitespace */
+					*f = '\0';
+
+				} else if (t > (f + 1)) {
+					memmove(f + 1, t, strlen(t) + 1);
+				}
+			}
+		}
+
+		/* if the line is too long to fit in the buffer, bail */
+		if ((strlen(line) + strlen(buf) + 1) >= maxlen) {
+			printf("line too long\n");
+			fclose(fp);
+			return -1;
+		}
+
+		/* add the line to the buffer */
+		strcat(buf, line);
+	}
+
+	fclose(fp);
+	return 0;
+}