Support for decimal SI units

src/include/options.h

@@ -34,6 +34,7 @@ struct opts_s {           /* structure describing run-time options */
 	bool average_rate;             /* average rate counter flag */
 	bool bytes;                    /* bytes transferred flag */
 	bool bits;                     /* report transfer size in bits */
+	bool si;                       /* decimal prefix flag */
 	bool bufpercent;               /* transfer buffer percentage flag */
 	size_t lastwritten;            /* show N bytes last written */
 	bool force;                    /* force-if-not-terminal flag */

src/include/pv-internal.h

@@ -105,6 +105,7 @@ struct pvstate_s {
 		bool wait;                       /* wait for data before display */
 		bool linemode;                   /* count lines instead of bytes */
 		bool bits;			 /* report bits instead of bytes */
+		bool si;			 /* use decimal prefixes */
 		bool null_terminated_lines;      /* lines are null-terminated */
 		bool no_display;                 /* do nothing other than pipe data */
 		unsigned int skip_errors;        /* skip read errors counter */

src/include/pv.h

@@ -164,6 +164,7 @@ extern void pv_state_wait_set(pvstate_t, bool);
 extern void pv_state_delay_start_set(pvstate_t, double);
 extern void pv_state_linemode_set(pvstate_t, bool);
 extern void pv_state_bits_set(pvstate_t, bool);
+extern void pv_state_si_set(pvstate_t, bool);
 extern void pv_state_null_terminated_lines_set(pvstate_t, bool);
 extern void pv_state_no_display_set(pvstate_t, bool);
 extern void pv_state_skip_errors_set(pvstate_t, unsigned int);