make rs232_set_device and rs232_write accept const string

Author: minoki

include/librs232/rs232.h

@@ -179,7 +179,7 @@ RS232_LIB unsigned int rs232_open(struct rs232_port_t *p);
 RS232_LIB unsigned int rs232_port_open(struct rs232_port_t *p);
 RS232_LIB unsigned int rs232_close(struct rs232_port_t *p);
 RS232_LIB unsigned int rs232_flush(struct rs232_port_t *p);
-RS232_LIB void rs232_set_device(struct rs232_port_t *p, char *device);
+RS232_LIB void rs232_set_device(struct rs232_port_t *p, const char *device);
 RS232_LIB unsigned int rs232_set_baud(struct rs232_port_t *p, unsigned int baud);
 RS232_LIB unsigned int rs232_set_stop(struct rs232_port_t *p, unsigned int stop);
 RS232_LIB unsigned int rs232_set_data(struct rs232_port_t *p, unsigned int data);
@@ -198,8 +198,8 @@ RS232_LIB unsigned int rs232_get_rts(struct rs232_port_t *p);
 RS232_LIB unsigned int rs232_read(struct rs232_port_t *p, unsigned char *buf, unsigned int buf_len, unsigned int *read_len);
 RS232_LIB unsigned int rs232_read_timeout(struct rs232_port_t *p, unsigned char *buf, unsigned int buf_len, unsigned int *read_len, unsigned int timeout);
 RS232_LIB unsigned int rs232_read_timeout_forced(struct rs232_port_t *p, unsigned char *buf, unsigned int buf_len, unsigned int *read_len, unsigned int timeout);
-RS232_LIB unsigned int rs232_write(struct rs232_port_t *p, unsigned char *buf, unsigned int buf_len, unsigned int *write_len);
-RS232_LIB unsigned int rs232_write_timeout(struct rs232_port_t *p, unsigned char *buf, unsigned int buf_len, unsigned int *write_len, unsigned int timeout);
+RS232_LIB unsigned int rs232_write(struct rs232_port_t *p, const unsigned char *buf, unsigned int buf_len, unsigned int *write_len);
+RS232_LIB unsigned int rs232_write_timeout(struct rs232_port_t *p, const unsigned char *buf, unsigned int buf_len, unsigned int *write_len, unsigned int timeout);
 RS232_LIB unsigned int rs232_in_qeue(struct rs232_port_t *p, unsigned int *in_bytes);
 RS232_LIB void rs232_in_qeue_clear(struct rs232_port_t *p);
 RS232_LIB const char * rs232_to_string(struct rs232_port_t *p);

src/rs232_posix.c

@@ -341,7 +341,7 @@ rs232_read_timeout(struct rs232_port_t *p, unsigned char *buf,
 }
 
 unsigned int
-rs232_write(struct rs232_port_t *p, unsigned char *buf, unsigned int buf_len,
+rs232_write(struct rs232_port_t *p, const unsigned char *buf, unsigned int buf_len,
 		unsigned int *write_len)
 {
 	int w;
@@ -371,7 +371,7 @@ rs232_write(struct rs232_port_t *p, unsigned char *buf, unsigned int buf_len,
 }
 
 unsigned int
-rs232_write_timeout(struct rs232_port_t *p, unsigned char *buf,
+rs232_write_timeout(struct rs232_port_t *p, const unsigned char *buf,
 			unsigned int buf_len, unsigned int *write_len,
 			unsigned int timeout)
 {
@@ -478,7 +478,7 @@ rs232_open(struct rs232_port_t *p)
 }
 
 void
-rs232_set_device(struct rs232_port_t *p, char *device)
+rs232_set_device(struct rs232_port_t *p, const char *device)
 {
 	DBG("p=%p old=%s new=%s\n", (void *)p, p->dev, device);
 	strncpy(p->dev, device, RS232_STRLEN_DEVICE);

src/rs232_windows.c

@@ -302,7 +302,7 @@ rs232_read_timeout(struct rs232_port_t *p, unsigned char *buf,
 }
 
 RS232_LIB unsigned int
-rs232_write(struct rs232_port_t *p, unsigned char *buf, unsigned int buf_len,
+rs232_write(struct rs232_port_t *p, const unsigned char *buf, unsigned int buf_len,
 		unsigned int *write_len)
 {
 	unsigned int w = 0;
@@ -330,7 +330,7 @@ rs232_write(struct rs232_port_t *p, unsigned char *buf, unsigned int buf_len,
 }
 
 RS232_LIB unsigned int
-rs232_write_timeout(struct rs232_port_t *p, unsigned char *buf,
+rs232_write_timeout(struct rs232_port_t *p, const unsigned char *buf,
 			unsigned int buf_len, unsigned int *write_len,
 			unsigned int timeout)
 {
@@ -427,7 +427,7 @@ rs232_open(struct rs232_port_t *p)
 }
 
 RS232_LIB void
-rs232_set_device(struct rs232_port_t *p, char *device)
+rs232_set_device(struct rs232_port_t *p, const char *device)
 {
 	DBG("p=%p old=%s new=%s\n", (void *)p, p->dev, device);
 	strncpy(p->dev, device, RS232_STRLEN_DEVICE);