From e719ffd1d17149c66b854bf2d5fcd5becf85545d Mon Sep 17 00:00:00 2001
From: Klaas Freitag <freitag@suse.de>
Date: Tue, 12 May 1998 22:59:07 +0000
Subject: [PATCH] First try at extension tolerant /proc parser. Only used by
 route so far.

---
 lib/Makefile  |  4 ++--
 lib/inet_gr.c | 23 ++++++++++++++++++++++-
 lib/proc.c    | 39 +++++++++++++++++++++++++++++++++++++++
 lib/proc.h    |  4 ++++
 4 files changed, 67 insertions(+), 3 deletions(-)
 create mode 100644 lib/proc.c
 create mode 100644 lib/proc.h

diff --git a/lib/Makefile b/lib/Makefile
index a36f989..ebfabe5 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -34,7 +34,7 @@ AFOBJS	 = unix.o inet.o inet6.o ax25.o ipx.o ddp.o ipx.o netrom.o af.o rose.o ec
 AFGROBJS = inet_gr.o inet6_gr.o ipx_gr.o ddp_gr.o netrom_gr.o ax25_gr.o rose_gr.o getroute.o
 AFSROBJS = inet_sr.o inet6_sr.o netrom_sr.o ipx_sr.o setroute.o
 ACTOBJS  = slip_ac.o ppp_ac.o activate.o
-VARIA	 = getargs.o masq_info.o
+VARIA	 = getargs.o masq_info.o proc.o
 NLSMISC  = net-string.o
 
 OBJS	= $(NLSMISC) $(VARIA) $(AFOBJS) $(HWOBJS) \
@@ -43,7 +43,7 @@ OBJS	= $(NLSMISC) $(VARIA) $(AFOBJS) $(HWOBJS) \
 
 # This can be overwritten by the TOPLEVEL Makefile
 TOPDIR=..
-COPTS = -O2 -Wall -fomit-frame-pointer #-DDEBUG
+COPTS = -O2 -Wall #-DDEBUG
 LOPTS = -s
 
 CFLAGS  = $(COPTS) -I. -I$(TOPDIR) -I$(TOPDIR)/include
diff --git a/lib/inet_gr.c b/lib/inet_gr.c
index de6e6dd..108bef5 100644
--- a/lib/inet_gr.c
+++ b/lib/inet_gr.c
@@ -22,6 +22,7 @@
 #include "net-locale.h"
 
 #include "net-features.h"
+#include "proc.h"
 
 extern     struct aftype   inet_aftype;
 
@@ -34,6 +35,7 @@ int rprint_fib(int ext, int numeric)
   struct sockaddr snet, sgate, smask;
   int num, iflags, metric, refcnt, use, mss, window, irtt;
   FILE *fp=fopen(_PATH_PROCNET_ROUTE, "r");
+  char *fmt;	
 
   if (!fp) {
 	ESYSNOT("getroute","INET FIB");
@@ -59,9 +61,28 @@ int rprint_fib(int ext, int numeric)
   irtt=0;
   window=0;
   mss=0;
+
+  fmt = proc_gen_fmt(_PATH_PROCNET_ROUTE, fp,
+					 "Iface", "%16s",
+					 "Destination", "%128s",
+					 "Gateway", "%128s",
+					 "Flags", "%X",
+					 "RefCnt", "%d", 
+					 "Use",  "%d", 
+					 "Metric", "%d", 
+					 "Mask", "%128s",
+					 "MTU", "%d", 
+					 "Window", "%d",
+					 "IRTT", "%d", 
+					 NULL); 
+  /* "%16s %128s %128s %X %d %d %d %128s %d %d %d\n" */ 
+
+  if (!fmt) 
+	  return 1; 
+
   while (fgets(buff, 1023, fp))
   {
-	num = sscanf(buff, "%16s %128s %128s %X %d %d %d %128s %d %d %d\n",
+	num = sscanf(buff, fmt, 
 		iface, net_addr, gate_addr,
 		&iflags, &refcnt, &use, &metric, mask_addr,
  		&mss,&window,&irtt);
diff --git a/lib/proc.c b/lib/proc.c
new file mode 100644
index 0000000..9e439f3
--- /dev/null
+++ b/lib/proc.c
@@ -0,0 +1,39 @@
+/* Tolerant /proc file parser. Copyright 1998 Andi Kleen */ 
+
+#include <string.h> 
+#include <stdarg.h>
+#include <stdio.h>
+
+/* Caller must free return string. */ 
+char * 
+proc_gen_fmt(char *name, FILE *fh, ...)
+{
+	char buf[512], format[512] = ""; 
+	char *title, *head; 
+	va_list ap;
+
+	if (!fgets(buf, sizeof buf, fh)) 
+		return NULL; 
+
+	va_start(ap,fh); 
+	head = strtok(buf, " \t"); 
+	title = va_arg(ap, char *); 
+	while (title && head) { 
+		if (!strcmp(title, head)) { 
+			strcat(format, va_arg(ap, char *)); 
+			title = va_arg(ap, char *); 
+		} else {
+			strcat(format, "%*[^ \t]"); 
+		}
+		strcat(format, " "); 
+		head = strtok(NULL, " \t"); 
+	}
+	va_end(ap); 
+
+	if (title) { 
+		fprintf(stderr, "warning: %s does not contain required field %s\n",
+						name, title); 
+		return NULL; 
+	}
+	return strdup(format); 
+}
diff --git a/lib/proc.h b/lib/proc.h
new file mode 100644
index 0000000..795765a
--- /dev/null
+++ b/lib/proc.h
@@ -0,0 +1,4 @@
+
+
+/* Generate a suitable scanf format for a column title line */ 
+char *proc_gen_fmt(char *name, FILE *fh, ...); 
-- 
2.7.4