Save 0.5K.

1 files changed, 154 insertions, 129 deletions

diff --git a/libbb/interface.c b/libbb/interface.c
index 47358fe..394ba5f 100644
--- a/libbb/interface.c
+++ b/libbb/interface.c
@@ -15,7 +15,7 @@
  *              that either displays or sets the characteristics of
  *              one or more of the system's networking interfaces.
  *
- * Version:     $Id: interface.c,v 1.18 2003/07/28 06:35:32 andersen Exp $
+ * Version:     $Id: interface.c,v 1.19 2003/08/02 00:04:18 mjn3 Exp $
  *
  * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  *              and others.  Copyright 1993 MicroWalt Corporation
@@ -87,8 +87,6 @@
 #define new(p) ((p) = xcalloc(1,sizeof(*(p))))
 #define KRELEASE(maj,min,patch) ((maj) * 65536 + (min)*256 + (patch))
 
-static int procnetdev_vsn = 1;
-
 #ifdef HAVE_HWSLIP
 #include <net/if_slip.h>
 #endif
@@ -1021,71 +1019,76 @@ static char *get_name(char *name, char *p)
 	return p;
 }
 
-static int get_dev_fields(char *bp, struct interface *ife)
+/* If scanf supports size qualifiers for %n conversions, then we can
+ * use a modified fmt that simply stores the position in the fields
+ * having no associated fields in the proc string.  Of course, we need
+ * to zero them again when we're done.  But that is smaller than the
+ * old approach of multiple scanf occurrences with large numbers of
+ * args. */
+
+/* static const char *ss_fmt[] = { */
+/* 	"%Ln%Lu%lu%lu%lu%lu%ln%ln%Ln%Lu%lu%lu%lu%lu%lu", */
+/* 	"%Lu%Lu%lu%lu%lu%lu%ln%ln%Lu%Lu%lu%lu%lu%lu%lu", */
+/* 	"%Lu%Lu%lu%lu%lu%lu%lu%lu%Lu%Lu%lu%lu%lu%lu%lu%lu" */
+/* }; */
+
+	/* Lie about the size of the int pointed to for %n. */
+#if INT_MAX == LONG_MAX
+static const char *ss_fmt[] = {
+	"%n%Lu%u%u%u%u%n%n%n%Lu%u%u%u%u%u",
+	"%Lu%Lu%u%u%u%u%n%n%Lu%Lu%u%u%u%u%u",
+	"%Lu%Lu%u%u%u%u%u%u%Lu%Lu%u%u%u%u%u%u"
+};
+#else
+static const char *ss_fmt[] = {
+	"%n%Lu%lu%lu%lu%lu%n%n%n%Lu%lu%lu%lu%lu%lu",
+	"%Lu%Lu%lu%lu%lu%lu%n%n%Lu%Lu%lu%lu%lu%lu%lu",
+	"%Lu%Lu%lu%lu%lu%lu%lu%lu%Lu%Lu%lu%lu%lu%lu%lu%lu"
+};
+
+#endif
+
+static void get_dev_fields(char *bp, struct interface *ife, int procnetdev_vsn)
 {
-	switch (procnetdev_vsn) {
-	case 3:
-		sscanf(bp,
-			   "%Lu %Lu %lu %lu %lu %lu %lu %lu %Lu %Lu %lu %lu %lu %lu %lu %lu",
-			   &ife->stats.rx_bytes,
-			   &ife->stats.rx_packets,
-			   &ife->stats.rx_errors,
-			   &ife->stats.rx_dropped,
-			   &ife->stats.rx_fifo_errors,
-			   &ife->stats.rx_frame_errors,
-			   &ife->stats.rx_compressed,
-			   &ife->stats.rx_multicast,
-			   &ife->stats.tx_bytes,
-			   &ife->stats.tx_packets,
-			   &ife->stats.tx_errors,
-			   &ife->stats.tx_dropped,
-			   &ife->stats.tx_fifo_errors,
-			   &ife->stats.collisions,
-			   &ife->stats.tx_carrier_errors, &ife->stats.tx_compressed);
-		break;
-	case 2:
-		sscanf(bp, "%Lu %Lu %lu %lu %lu %lu %Lu %Lu %lu %lu %lu %lu %lu",
-			   &ife->stats.rx_bytes,
-			   &ife->stats.rx_packets,
-			   &ife->stats.rx_errors,
-			   &ife->stats.rx_dropped,
-			   &ife->stats.rx_fifo_errors,
-			   &ife->stats.rx_frame_errors,
-			   &ife->stats.tx_bytes,
-			   &ife->stats.tx_packets,
-			   &ife->stats.tx_errors,
-			   &ife->stats.tx_dropped,
-			   &ife->stats.tx_fifo_errors,
-			   &ife->stats.collisions, &ife->stats.tx_carrier_errors);
-		ife->stats.rx_multicast = 0;
-		break;
-	case 1:
-		sscanf(bp, "%Lu %lu %lu %lu %lu %Lu %lu %lu %lu %lu %lu",
-			   &ife->stats.rx_packets,
-			   &ife->stats.rx_errors,
-			   &ife->stats.rx_dropped,
-			   &ife->stats.rx_fifo_errors,
-			   &ife->stats.rx_frame_errors,
-			   &ife->stats.tx_packets,
-			   &ife->stats.tx_errors,
-			   &ife->stats.tx_dropped,
-			   &ife->stats.tx_fifo_errors,
-			   &ife->stats.collisions, &ife->stats.tx_carrier_errors);
-		ife->stats.rx_bytes = 0;
-		ife->stats.tx_bytes = 0;
+	memset(&ife->stats, 0, sizeof(struct user_net_device_stats));
+
+	sscanf(bp, ss_fmt[procnetdev_vsn],
+		   &ife->stats.rx_bytes, /* missing for 0 */
+		   &ife->stats.rx_packets,
+		   &ife->stats.rx_errors,
+		   &ife->stats.rx_dropped,
+		   &ife->stats.rx_fifo_errors,
+		   &ife->stats.rx_frame_errors,
+		   &ife->stats.rx_compressed, /* missing for <= 1 */
+		   &ife->stats.rx_multicast, /* missing for <= 1 */
+		   &ife->stats.tx_bytes, /* missing for 0 */
+		   &ife->stats.tx_packets,
+		   &ife->stats.tx_errors,
+		   &ife->stats.tx_dropped,
+		   &ife->stats.tx_fifo_errors,
+		   &ife->stats.collisions,
+		   &ife->stats.tx_carrier_errors,
+		   &ife->stats.tx_compressed /* missing for <= 1 */
+		   );
+
+	if (procnetdev_vsn <= 1) {
+		if (procnetdev_vsn == 0) {
+			ife->stats.rx_bytes = 0;
+			ife->stats.tx_bytes = 0;
+		}
 		ife->stats.rx_multicast = 0;
-		break;
+		ife->stats.rx_compressed = 0;
+		ife->stats.tx_compressed = 0;
 	}
-	return 0;
 }
 
 static inline int procnetdev_version(char *buf)
 {
 	if (strstr(buf, "compressed"))
-		return 3;
-	if (strstr(buf, "bytes"))
 		return 2;
-	return 1;
+	if (strstr(buf, "bytes"))
+		return 1;
+	return 0;
 }
 
 static int if_readlist_proc(char *target)
@@ -1094,7 +1097,7 @@ static int if_readlist_proc(char *target)
 	FILE *fh;
 	char buf[512];
 	struct interface *ife;
-	int err;
+	int err, procnetdev_vsn;
 
 	if (proc_read)
 		return 0;
@@ -1109,28 +1112,7 @@ static int if_readlist_proc(char *target)
 	fgets(buf, sizeof buf, fh);	/* eat line */
 	fgets(buf, sizeof buf, fh);
 
-#if 0					/* pretty, but can't cope with missing fields */
-	fmt = proc_gen_fmt(_PATH_PROCNET_DEV, 1, fh, "face", "",	/* parsed separately */
-					   "bytes", "%lu",
-					   "packets", "%lu",
-					   "errs", "%lu",
-					   "drop", "%lu",
-					   "fifo", "%lu",
-					   "frame", "%lu",
-					   "compressed", "%lu",
-					   "multicast", "%lu",
-					   "bytes", "%lu",
-					   "packets", "%lu",
-					   "errs", "%lu",
-					   "drop", "%lu",
-					   "fifo", "%lu",
-					   "colls", "%lu",
-					   "carrier", "%lu", "compressed", "%lu", NULL);
-	if (!fmt)
-		return -1;
-#else
 	procnetdev_vsn = procnetdev_version(buf);
-#endif
 
 	err = 0;
 	while (fgets(buf, sizeof buf, fh)) {
@@ -1138,7 +1120,7 @@ static int if_readlist_proc(char *target)
 
 		s = get_name(name, buf);
 		ife = add_interface(name);
-		get_dev_fields(s, ife);
+		get_dev_fields(s, ife, procnetdev_vsn);
 		ife->statistics_valid = 1;
 		if (target && !strcmp(target, name))
 			break;
@@ -1148,9 +1130,6 @@ static int if_readlist_proc(char *target)
 		err = -1;
 		proc_read = 0;
 	}
-#if 0
-	free(fmt);
-#endif
 	fclose(fh);
 	return err;
 }
@@ -1670,7 +1649,8 @@ static void hwinit()
 #endif							/* KEEP_UNUSED */
 
 #ifdef IFF_PORTSEL
-static const char *if_port_text[][4] = {
+#if 0
+static const char * const if_port_text[][4] = {
 	/* Keep in step with <linux/netdevice.h> */
 	{"unknown", NULL, NULL, NULL},
 	{"10base2", "bnc", "coax", NULL},
@@ -1681,6 +1661,19 @@ static const char *if_port_text[][4] = {
 	{"100baseFX", NULL, NULL, NULL},
 	{NULL, NULL, NULL, NULL},
 };
+#else
+static const char * const if_port_text[] = {
+	/* Keep in step with <linux/netdevice.h> */
+	"unknown",
+	"10base2",
+	"10baseT",
+	"AUI",
+	"100baseT",
+	"100baseTX",
+	"100baseFX",
+	NULL
+};
+#endif
 #endif
 
 /* Check our hardware type table for this type. */
@@ -1714,29 +1707,83 @@ static int hw_null_address(struct hwtype *hw, void *ap)
 	return 1;
 }
 
-static const char TRext[] = "\0\0k\0M";
+#warning devel code
+static const char TRext[] = "\0\0\0Ki\0Mi\0Gi\0Ti";
 
 static void print_bytes_scaled(unsigned long long ull, const char *end)
 {
 	unsigned long long int_part;
-	unsigned long frac_part;
 	const char *ext;
+	unsigned int frac_part;
 	int i;
 
 	frac_part = 0;
 	ext = TRext;
 	int_part = ull;
-	for (i = 0; i < 2; i++) {
+	i = 4;
+	do {
+#if 0
+		/* This does correct rounding and is a little larger.  But it
+		 * uses KiB as the smallest displayed unit. */
+		if ((int_part < (1024*1024 - 51)) || !--i) {
+			i = 0;
+			int_part += 51;		/* 1024*.05 = 51.2 */
+			frac_part = ((((unsigned int) int_part) & (1024-1)) * 10) / 1024;
+		}
+		int_part /= 1024;
+		ext += 3;	/* KiB, MiB, GiB, TiB */
+#else
 		if (int_part >= 1024) {
-			frac_part = ((int_part % 1024) * 10) / 1024;
+			frac_part = ((((unsigned int) int_part) & (1024-1)) * 10) / 1024;
 			int_part /= 1024;
-			ext += 2;	/* Kb, Mb */
+			ext += 3;	/* KiB, MiB, GiB, TiB */
 		}
-	}
+		--i;
+#endif
+	} while (i);
 
-	printf("X bytes:%Lu (%Lu.%lu %siB)%s", ull, int_part, frac_part, ext, end);
+	printf("X bytes:%Lu (%Lu.%u %sB)%s", ull, int_part, frac_part, ext, end);
 }
 
+static const char * const ife_print_flags_strs[] = {
+	"UP ",
+	"BROADCAST ",
+	"DEBUG ",
+	"LOOPBACK ",
+	"POINTOPOINT ",
+	"NOTRAILERS ",
+	"RUNNING ",
+	"NOARP ",
+	"PROMISC ",
+	"ALLMULTI ",
+	"SLAVE ",
+	"MASTER ",
+	"MULTICAST ",
+#ifdef HAVE_DYNAMIC
+	"DYNAMIC "
+#endif
+};
+
+static const unsigned short ife_print_flags_mask[] = {
+	IFF_UP,
+	IFF_BROADCAST,
+	IFF_DEBUG,
+	IFF_LOOPBACK,
+	IFF_POINTOPOINT,
+	IFF_NOTRAILERS,
+	IFF_RUNNING,
+	IFF_NOARP,
+	IFF_PROMISC,
+	IFF_ALLMULTI,
+	IFF_SLAVE,
+	IFF_MASTER,
+	IFF_MULTICAST,
+#ifdef HAVE_DYNAMIC
+	IFF_DYNAMIC
+#endif
+	0
+};
+
 static void ife_print(struct interface *ptr)
 {
 	struct aftype *ap;
@@ -1782,7 +1829,7 @@ static void ife_print(struct interface *ptr)
 		printf(_("HWaddr %s  "), hw->print(ptr->hwaddr));
 #ifdef IFF_PORTSEL
 	if (ptr->flags & IFF_PORTSEL) {
-		printf(_("Media:%s"), if_port_text[ptr->map.port][0]);
+		printf(_("Media:%s"), if_port_text[ptr->map.port] /* [0] */);
 		if (ptr->flags & IFF_AUTOMEDIA)
 			printf(_("(auto)"));
 	}
@@ -1907,38 +1954,18 @@ static void ife_print(struct interface *ptr)
 
 	printf("          ");
 	/* DONT FORGET TO ADD THE FLAGS IN ife_print_short, too */
-	if (ptr->flags == 0)
+
+	if (ptr->flags == 0) {
 		printf(_("[NO FLAGS] "));
-	if (ptr->flags & IFF_UP)
-		printf(_("UP "));
-	if (ptr->flags & IFF_BROADCAST)
-		printf(_("BROADCAST "));
-	if (ptr->flags & IFF_DEBUG)
-		printf(_("DEBUG "));
-	if (ptr->flags & IFF_LOOPBACK)
-		printf(_("LOOPBACK "));
-	if (ptr->flags & IFF_POINTOPOINT)
-		printf(_("POINTOPOINT "));
-	if (ptr->flags & IFF_NOTRAILERS)
-		printf(_("NOTRAILERS "));
-	if (ptr->flags & IFF_RUNNING)
-		printf(_("RUNNING "));
-	if (ptr->flags & IFF_NOARP)
-		printf(_("NOARP "));
-	if (ptr->flags & IFF_PROMISC)
-		printf(_("PROMISC "));
-	if (ptr->flags & IFF_ALLMULTI)
-		printf(_("ALLMULTI "));
-	if (ptr->flags & IFF_SLAVE)
-		printf(_("SLAVE "));
-	if (ptr->flags & IFF_MASTER)
-		printf(_("MASTER "));
-	if (ptr->flags & IFF_MULTICAST)
-		printf(_("MULTICAST "));
-#ifdef HAVE_DYNAMIC
-	if (ptr->flags & IFF_DYNAMIC)
-		printf(_("DYNAMIC "));
-#endif
+	} else {
+		int i = 0;
+		do {
+			if (ptr->flags & ife_print_flags_mask[i]) {
+				printf(_(ife_print_flags_strs[i]));
+			}
+		} while (ife_print_flags_mask[++i]);
+	}
+
 	/* DONT FORGET TO ADD THE FLAGS IN ife_print_short */
 	printf(_(" MTU:%d  Metric:%d"), ptr->mtu, ptr->metric ? ptr->metric : 1);
 #ifdef SIOCSKEEPALIVE
@@ -1956,8 +1983,7 @@ static void ife_print(struct interface *ptr)
 		 */
 		printf("          ");
 
-		printf(_
-			   ("RX packets:%Lu errors:%lu dropped:%lu overruns:%lu frame:%lu\n"),
+		printf(_("RX packets:%Lu errors:%lu dropped:%lu overruns:%lu frame:%lu\n"),
 			   ptr->stats.rx_packets, ptr->stats.rx_errors,
 			   ptr->stats.rx_dropped, ptr->stats.rx_fifo_errors,
 			   ptr->stats.rx_frame_errors);
@@ -1965,8 +1991,7 @@ static void ife_print(struct interface *ptr)
 			printf(_("             compressed:%lu\n"),
 				   ptr->stats.rx_compressed);
 		printf("          ");
-		printf(_
-			   ("TX packets:%Lu errors:%lu dropped:%lu overruns:%lu carrier:%lu\n"),
+		printf(_("TX packets:%Lu errors:%lu dropped:%lu overruns:%lu carrier:%lu\n"),
 			   ptr->stats.tx_packets, ptr->stats.tx_errors,
 			   ptr->stats.tx_dropped, ptr->stats.tx_fifo_errors,
 			   ptr->stats.tx_carrier_errors);