avoid using strok - eliminates use of hidden global variable

function                                             old     new   delta
udhcp_str2optset                                     616     650     +34
setpriv_main                                         950     975     +25
switch_root_main                                     688     706     +18
parse                                                958     970     +12
getopt_main                                          622     628      +6
parse_resolvconf                                     302     306      +4
mpstat_main                                         1139    1142      +3
static.p                                               4       -      -4
cdcmd                                                717     702     -15
strtok                                               148       -    -148
------------------------------------------------------------------------------
(add/remove: 0/3 grow/shrink: 7/1 up/down: 102/-167)          Total: -65 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

util-linux/getopt.c

@@ -289,12 +289,13 @@ static struct option *add_long_options(struct option *long_options, char *option
 {
 	int long_nr = 0;
 	int arg_opt, tlen;
-	char *tokptr = strtok(options, ", \t\n");
+	char *tokptr;
 
 	if (long_options)
 		while (long_options[long_nr].name)
 			long_nr++;
 
+	tokptr = strtok_r(options, ", \t\n", &options);
 	while (tokptr) {
 		arg_opt = no_argument;
 		tlen = strlen(tokptr);
@@ -318,7 +319,7 @@ static struct option *add_long_options(struct option *long_options, char *option
 			long_nr++;
 			/*memset(&long_options[long_nr], 0, sizeof(long_options[0])); - xrealloc_vector did it */
 		}
-		tokptr = strtok(NULL, ", \t\n");
+		tokptr = strtok_r(NULL, ", \t\n", &options);
 	}
 	return long_options;
 }

util-linux/mount.c

@@ -1230,6 +1230,7 @@ static NOINLINE int nfsmount(struct mntent *mp, unsigned long vfsflags, char *fi
 	 * then data pointer is interpreted as a string. */
 	struct nfs_mount_data data;
 	char *opt;
+	char *tokstate;
 	struct hostent *hp;
 	struct sockaddr_in server_addr;
 	struct sockaddr_in mount_server_addr;
@@ -1348,7 +1349,7 @@ static NOINLINE int nfsmount(struct mntent *mp, unsigned long vfsflags, char *fi
 	nfsvers = 0;
 
 	/* parse options */
-	if (filteropts)	for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) {
+	if (filteropts)	for (opt = strtok_r(filteropts, ",", &tokstate); opt; opt = strtok_r(NULL, ",", &tokstate)) {
 		char *opteq = strchr(opt, '=');
 		if (opteq) {
 			int val, idx;

util-linux/setpriv.c

@@ -144,10 +144,11 @@ static unsigned parse_cap(const char *cap)
 static void set_inh_caps(char *capstring)
 {
 	struct caps caps;
+	char *string;
 
 	getcaps(&caps);
 
-	capstring = strtok(capstring, ",");
+	capstring = strtok_r(capstring, ",", &string);
 	while (capstring) {
 		unsigned cap;
 
@@ -159,7 +160,7 @@ static void set_inh_caps(char *capstring)
 			caps.data[CAP_TO_INDEX(cap)].inheritable |= CAP_TO_MASK(cap);
 		else
 			caps.data[CAP_TO_INDEX(cap)].inheritable &= ~CAP_TO_MASK(cap);
-		capstring = strtok(NULL, ",");
+		capstring = strtok_r(NULL, ",", &string);
 	}
 
 	if (capset(&caps.header, caps.data) != 0)
@@ -170,7 +171,7 @@ static void set_ambient_caps(char *string)
 {
 	char *cap;
 
-	cap = strtok(string, ",");
+	cap = strtok_r(string, ",", &string);
 	while (cap) {
 		unsigned idx;
 
@@ -182,7 +183,7 @@ static void set_ambient_caps(char *string)
 			if (prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_LOWER, idx, 0, 0) < 0)
 				bb_simple_perror_msg("cap_ambient_lower");
 		}
-		cap = strtok(NULL, ",");
+		cap = strtok_r(NULL, ",", &string);
 	}
 }
 #endif /* FEATURE_SETPRIV_CAPABILITIES */

util-linux/switch_root.c

@@ -164,7 +164,7 @@ static void drop_capabilities(char *string)
 {
 	char *cap;
 
-	cap = strtok(string, ",");
+	cap = strtok_r(string, ",", &string);
 	while (cap) {
 		unsigned cap_idx;
 
@@ -174,7 +174,7 @@ static void drop_capabilities(char *string)
 		drop_bounding_set(cap_idx);
 		drop_capset(cap_idx);
 		bb_error_msg("dropped capability: %s", cap);
-		cap = strtok(NULL, ",");
+		cap = strtok_r(NULL, ",", &string);
 	}
 }
 #endif