interfaces-plugin: add read sys, proc

src/interfaces/src/plugin/api/interfaces/read.c

@@ -0,0 +1,75 @@
+#include "plugin/common.h"
+#include "srpc/common.h"
+
+#include <errno.h>
+
+int read_from_proc_file(const char *dir_path, char *interface, const char *fn, int *val)
+{
+	int error = 0;
+	char tmp_buffer[PATH_MAX];
+	FILE *fptr = NULL;
+	char tmp_val[2] = {0};
+
+	error = snprintf(tmp_buffer, sizeof(tmp_buffer), "%s/%s/%s", dir_path, interface, fn);
+	if (error < 0) {
+		// snprintf error
+		SRPLG_LOG_ERR(PLUGIN_NAME, "snprintf failed");
+		goto out;
+	}
+
+	// snprintf returns return the number of bytes that are written
+	// reset error to 0
+	error = 0;
+
+	fptr = fopen((const char *) tmp_buffer, "r");
+
+	if (fptr != NULL) {
+		fgets(tmp_val, sizeof(tmp_val), fptr);
+
+		*val = atoi(tmp_val);
+
+		fclose(fptr);
+	} else {
+		SRPLG_LOG_ERR(PLUGIN_NAME, "failed to open %s: %s", tmp_buffer, strerror(errno));
+		error = -1;
+		goto out;
+	}
+
+out:
+	return error;
+}
+
+int read_from_sys_file(const char* dir_path, char* interface, int* val)
+{
+    int error = 0;
+    char tmp_buffer[PATH_MAX];
+    FILE* fptr = NULL;
+    char tmp_val[4] = { 0 };
+
+    error = snprintf(tmp_buffer, sizeof(tmp_buffer), "%s/%s/type", dir_path, interface);
+    if (error < 0) {
+        // snprintf error
+        SRPLG_LOG_ERR(PLUGIN_NAME, "%s: snprintf failed", __func__);
+        goto out;
+    }
+
+    /* snprintf returns return the number of bytes that are written - reset error to 0 */
+    error = 0;
+
+    fptr = fopen((const char*)tmp_buffer, "r");
+
+    if (fptr != NULL) {
+        fgets(tmp_val, sizeof(tmp_val), fptr);
+
+        *val = atoi(tmp_val);
+
+        fclose(fptr);
+    } else {
+        SRPLG_LOG_ERR(PLUGIN_NAME, "%s: failed to open %s: %s", __func__, tmp_buffer, strerror(errno));
+        error = -1;
+        goto out;
+    }
+
+out:
+    return error;
+}

src/interfaces/src/plugin/api/interfaces/read.h

@@ -0,0 +1,8 @@
+#ifndef READ_H
+#define READ_H
+
+int read_from_proc_file(const char *dir_path, char *interface, const char *fn, int *val);
+
+int read_from_sys_file(const char* dir_path, char* interface, int* val);
+
+#endif /* READ_H */