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>

11 files changed, 46 insertions, 36 deletions

diff --git a/libbb/kernel_version.c b/libbb/kernel_version.c
index 7769a091b..6bb32ce5f 100644
--- a/libbb/kernel_version.c
+++ b/libbb/kernel_version.c
@@ -19,15 +19,17 @@ int FAST_FUNC get_linux_version_code(void)
 {
         struct utsname name;
         char *t;
-        int i, r;
+        int r;
 
         uname(&name); /* never fails */
-        t = name.release;
-        r = 0;
-        for (i = 0; i < 3; i++) {
-                t = strtok(t, ".");
-                r = r * 256 + (t ? atoi(t) : 0);
-                t = NULL;
-        }
-        return r;
+        t = name.release - 1;
+        r = 1;
+        do {
+                r <<= 8;
+                if (t) {
+                        r += atoi(++t);
+                        t = strchr(t, '.');
+                }
+        } while (r < 0x1000000);
+        return r - 0x1000000;
 }
diff --git a/libbb/update_passwd.c b/libbb/update_passwd.c
index c605c4c64..7b67f30cd 100644
--- a/libbb/update_passwd.c
+++ b/libbb/update_passwd.c
@@ -18,17 +18,20 @@
 #if ENABLE_SELINUX
 static void check_selinux_update_passwd(const char *username)
 {
-        security_context_t context;
-        char *seuser;
+        security_context_t seuser;
+        char *p;
 
         if (getuid() != (uid_t)0 || is_selinux_enabled() == 0)
                 return;  /* No need to check */
 
-        if (getprevcon_raw(&context) < 0)
+        if (getprevcon_raw(&seuser) < 0)
                 bb_simple_perror_msg_and_die("getprevcon failed");
-        seuser = strtok(context, ":");
-        if (!seuser)
-                bb_error_msg_and_die("invalid context '%s'", context);
+
+        p = strchr(seuser, ':');
+        if (!p)
+                bb_error_msg_and_die("invalid context '%s'", seuser);
+        *p = '\0';
+
         if (strcmp(seuser, username) != 0) {
                 security_class_t tclass;
                 access_vector_t av;
diff --git a/mailutils/reformime.c b/mailutils/reformime.c
index 321729e0a..307656a15 100644
--- a/mailutils/reformime.c
+++ b/mailutils/reformime.c
@@ -115,6 +115,7 @@ static int parse(const char *boundary, char **argv)
                 /* Split to tokens */
                 {
                         char *s, *p;
+                        char *tokstate;
                         unsigned ntokens;
                         const char *delims = ";=\" \t\n";
 
@@ -127,13 +128,13 @@ static int parse(const char *boundary, char **argv)
                         }
                         dbg_error_msg("L:'%s'", p);
                         ntokens = 0;
-                        s = strtok(s, delims);
+                        s = strtok_r(s, delims, &tokstate);
                         while (s) {
                                 tokens[ntokens] = s;
                                 if (ntokens < ARRAY_SIZE(tokens) - 1)
                                         ntokens++;
                                 dbg_error_msg("L[%d]='%s'", ntokens, s);
-                                s = strtok(NULL, delims);
+                                s = strtok_r(NULL, delims, &tokstate);
                         }
                         tokens[ntokens] = NULL;
                         dbg_error_msg("EMPTYLINE, ntokens:%d", ntokens);
diff --git a/networking/nslookup.c b/networking/nslookup.c
index c43e60558..759de5c83 100644
--- a/networking/nslookup.c
+++ b/networking/nslookup.c
@@ -703,12 +703,13 @@ static void parse_resolvconf(void)
 
                 while (fgets(line, sizeof(line), resolv)) {
                         char *p, *arg;
+                        char *tokstate;
 
-                        p = strtok(line, " \t\n");
+                        p = strtok_r(line, " \t\n", &tokstate);
                         if (!p)
                                 continue;
                         dbg("resolv_key:'%s'\n", p);
-                        arg = strtok(NULL, "\n");
+                        arg = strtok_r(NULL, "\n", &tokstate);
                         dbg("resolv_arg:'%s'\n", arg);
                         if (!arg)
                                 continue;
diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index 20d843bab..4bc719001 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -526,7 +526,7 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg,
 
         /* Cheat, the only *const* str possible is "" */
         str = (char *) const_str;
-        opt = strtok(str, " \t=:");
+        opt = strtok_r(str, " \t=:", &str);
         if (!opt)
                 return 0;
 
@@ -550,10 +550,10 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg,
                 char *val;
 
                 if (optflag->flags == OPTION_BIN) {
-                        val = strtok(NULL, ""); /* do not split "'q w e'" */
+                        val = strtok_r(NULL, "", &str); /* do not split "'q w e'" */
                         if (val) trim(val);
                 } else
-                        val = strtok(NULL, ", \t");
+                        val = strtok_r(NULL, ", \t", &str);
                 if (!val)
                         break;
 
@@ -567,7 +567,7 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg,
                         break;
                 case OPTION_IP_PAIR:
                         retval = udhcp_str2nip(val, buffer);
-                        val = strtok(NULL, ", \t/-");
+                        val = strtok_r(NULL, ", \t/-", &str);
                         if (!val)
                                 retval = 0;
                         if (retval)
@@ -631,7 +631,7 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg,
                                 *slash = '\0';
                                 retval = udhcp_str2nip(val, buffer + 1);
                                 buffer[0] = mask = bb_strtou(slash + 1, NULL, 10);
-                                val = strtok(NULL, ", \t/-");
+                                val = strtok_r(NULL, ", \t/-", &str);
                                 if (!val || mask > 32 || errno)
                                         retval = 0;
                                 if (retval) {
diff --git a/procps/mpstat.c b/procps/mpstat.c
index 52a436a55..c78c1f0a0 100644
--- a/procps/mpstat.c
+++ b/procps/mpstat.c
@@ -923,7 +923,7 @@ int mpstat_main(int argc UNUSED_PARAM, char **argv)
                 char *t;
                 G.p_option = 1;
 
-                for (t = strtok(opt_set_cpu, ","); t; t = strtok(NULL, ",")) {
+                for (t = strtok_r(opt_set_cpu, ",", &opt_set_cpu); t; t = strtok_r(NULL, ",", &opt_set_cpu)) {
                         if (strcmp(t, "ALL") == 0) {
                                 /* Select every CPU */
                                 memset(G.cpu_bitmap, 0xff, G.cpu_bitmap_len);
diff --git a/shell/ash.c b/shell/ash.c
index 07aa2da2e..58da0a2a0 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -2770,7 +2770,7 @@ updatepwd(const char *dir)
                         lim++;
                 }
         }
-        p = strtok(cdcomppath, "/");
+        p = strtok_r(cdcomppath, "/", &cdcomppath);
         while (p) {
                 switch (*p) {
                 case '.':
@@ -2789,7 +2789,7 @@ updatepwd(const char *dir)
                         new = stack_putstr(p, new);
                         USTPUTC('/', new);
                 }
-                p = strtok(NULL, "/");
+                p = strtok_r(NULL, "/", &cdcomppath);
         }
         if (new > lim)
                 STUNPUTC(new);
diff --git a/util-linux/getopt.c b/util-linux/getopt.c
index db7db6ff8..1fa402429 100644
--- a/util-linux/getopt.c
+++ b/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;
 }
diff --git a/util-linux/mount.c b/util-linux/mount.c
index 19ac13930..fc5161d7f 100644
--- a/util-linux/mount.c
+++ b/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;
diff --git a/util-linux/setpriv.c b/util-linux/setpriv.c
index 37e8821a1..1e4b201ed 100644
--- a/util-linux/setpriv.c
+++ b/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 */
diff --git a/util-linux/switch_root.c b/util-linux/switch_root.c
index c65096c27..f2674b5ac 100644
--- a/util-linux/switch_root.c
+++ b/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