scanf parsing fix for check_swap from tracker id 1123292. now use floor(3)

to round down floating point numbers.  requires -lm on many systems,
so support for testing for this was added to the configure.in and
automake template


git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1194 f882894a-f735-0410-b71e-b25c423dba1c

configure.in

@@ -137,6 +137,11 @@ AC_CHECK_LIB(socket,socket,SOCKETLIBS="$SOCKETLIBS -lsocket")
 AC_CHECK_LIB(resolv,main,SOCKETLIBS="$SOCKETLIBS -lresolv")
 AC_SUBST(SOCKETLIBS)
 
+dnl
+dnl check for math-related functions needing -lm
+AC_CHECK_LIB(m,floor,MATHLIBS="-lm")
+AC_SUBST(MATHLIBS)
+
 dnl Check for PostgreSQL libraries
 _SAVEDLIBS="$LIBS"
 _SAVEDCPPFLAGS="$CPPFLAGS"
@@ -567,7 +572,7 @@ AC_TRY_COMPILE([#include <sys/time.h>],
                               AC_DEFINE(NEED_GETTIMEOFDAY,1,[Define if gettimeofday is needed])))
 
 dnl Checks for library functions.
-AC_CHECK_FUNCS(memmove select socket strdup strstr strtod strtol strtoul)
+AC_CHECK_FUNCS(memmove select socket strdup strstr strtod strtol strtoul, floor)
 
 AC_MSG_CHECKING(return type of socket size)
 AC_TRY_COMPILE([#include <stdlib.h>

plugins/Makefile.am

@@ -9,6 +9,7 @@ datadir = @datadir@
 localedir = $(datadir)/locale
 DEFS = -DLOCALEDIR=\"$(localedir)\" @DEFS@
 LIBS = @LIBINTL@ @LIBS@ @SSLINCLUDE@
+MATHLIBS = @MATHLIBS@
 
 libexec_PROGRAMS = check_dhcp check_disk check_dummy check_http check_load \
 	check_mrtg check_mrtgtraf check_nwstat check_overcr check_ping \
@@ -72,7 +73,7 @@ check_real_LDADD = $(NETLIBS)
 check_snmp_LDADD = $(BASEOBJS) popen.o
 check_smtp_LDADD = $(NETLIBS) $(SSLLIBS)
 check_ssh_LDADD = $(NETLIBS)
-check_swap_LDADD = $(BASEOBJS) popen.o
+check_swap_LDADD = $(MATHLIBS) $(BASEOBJS) popen.o
 check_tcp_LDADD = $(NETLIBS) $(SSLLIBS)
 check_time_LDADD = $(NETLIBS)
 check_udp_LDADD = $(NETLIBS)

plugins/check_swap.c

@@ -42,8 +42,8 @@ void print_help (void);
 
 int warn_percent = 0;
 int crit_percent = 0;
-float warn_size = 0;
-float crit_size = 0;
+double warn_size = 0;
+double crit_size = 0;
 int verbose;
 int allswaps;
 
@@ -376,12 +376,13 @@ process_arguments (int argc, char **argv)
 		switch (c) {
 		case 'w':									/* warning size threshold */
 			if (is_intnonneg (optarg)) {
-				warn_size = (float) atoi (optarg);
+				warn_size = (double) atoi (optarg);
 				break;
 			}
 			else if (strstr (optarg, ",") &&
 							 strstr (optarg, "%") &&
-							 sscanf (optarg, "%.0f,%d%%", &warn_size, &warn_percent) == 2) {
+							 sscanf (optarg, "%g,%d%%", &warn_size, &warn_percent) == 2) {
+				warn_size = floor(warn_size);
 				break;
 			}
 			else if (strstr (optarg, "%") &&
@@ -393,12 +394,13 @@ process_arguments (int argc, char **argv)
 			}
 		case 'c':									/* critical size threshold */
 			if (is_intnonneg (optarg)) {
-				crit_size = (float) atoi (optarg);
+				crit_size = (double) atoi (optarg);
 				break;
 			}
 			else if (strstr (optarg, ",") &&
 							 strstr (optarg, "%") &&
-							 sscanf (optarg, "%.0f,%d%%", &crit_size, &crit_percent) == 2) {
+							 sscanf (optarg, "%g,%d%%", &crit_size, &crit_percent) == 2) {
+				crit_size = floor(crit_size);
 				break;
 			}
 			else if (strstr (optarg, "%") &&
@@ -439,12 +441,12 @@ process_arguments (int argc, char **argv)
 	if (c == argc)
 		return validate_arguments ();
 	if (warn_size == 0 && is_intnonneg (argv[c]))
-		warn_size = (float) atoi (argv[c++]);
+		warn_size = (double) atoi (argv[c++]);
 
 	if (c == argc)
 		return validate_arguments ();
 	if (crit_size == 0 && is_intnonneg (argv[c]))
-		crit_size = atoi (argv[c++]);
+		crit_size = (double) atoi (argv[c++]);
 
 	return validate_arguments ();
 }