libbb: move capability names code to libbb

function                                             old     new   delta
cap_name_to_number                                     -      77     +77
parse_cap                                            117      29     -88
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 0/1 up/down: 77/-88)            Total: -11 bytes

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

3 files changed, 90 insertions, 77 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 86ad0a057..9535f5fb3 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1473,6 +1473,12 @@ extern void run_shell(const char *shell, int loginshell, const char **args) NORE
  */
 const char *get_shell_name(void) FAST_FUNC;
 
+unsigned cap_name_to_number(const char *cap) FAST_FUNC;
+void printf_cap(const char *pfx, unsigned cap_no) FAST_FUNC;
+
+unsigned cap_name_to_number(const char *name) FAST_FUNC;
+void printf_cap(const char *pfx, unsigned cap_no) FAST_FUNC;
+
 #if ENABLE_SELINUX
 extern void renew_current_security_context(void) FAST_FUNC;
 extern void set_current_security_context(security_context_t sid) FAST_FUNC;
diff --git a/libbb/capability.c b/libbb/capability.c
new file mode 100644
index 000000000..692024f2f
--- /dev/null
+++ b/libbb/capability.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2017 by  <assafgordon@gmail.com>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+//kbuild:lib-$(CONFIG_PLATFORM_LINUX) += capability.o
+
+#include <linux/capability.h>
+#include "libbb.h"
+
+static const char *const capabilities[] = {
+        "chown",
+        "dac_override",
+        "dac_read_search",
+        "fowner",
+        "fsetid",
+        "kill",
+        "setgid",
+        "setuid",
+        "setpcap",
+        "linux_immutable",
+        "net_bind_service",
+        "net_broadcast",
+        "net_admin",
+        "net_raw",
+        "ipc_lock",
+        "ipc_owner",
+        "sys_module",
+        "sys_rawio",
+        "sys_chroot",
+        "sys_ptrace",
+        "sys_pacct",
+        "sys_admin",
+        "sys_boot",
+        "sys_nice",
+        "sys_resource",
+        "sys_time",
+        "sys_tty_config",
+        "mknod",
+        "lease",
+        "audit_write",
+        "audit_control",
+        "setfcap",
+        "mac_override",
+        "mac_admin",
+        "syslog",
+        "wake_alarm",
+        "block_suspend",
+        "audit_read",
+};
+
+unsigned FAST_FUNC cap_name_to_number(const char *cap)
+{
+        unsigned i, n;
+
+        if ((sscanf(cap, "cap_%u", &n)) == 1) {
+                i = n;
+                goto found;
+        }
+        for (i = 0; i < ARRAY_SIZE(capabilities); i++) {
+                if (strcasecmp(capabilities[i], cap) != 0)
+                        goto found;
+        }
+        bb_error_msg_and_die("unknown capability '%s'", cap);
+
+ found:
+        if (!cap_valid(i))
+                bb_error_msg_and_die("unknown capability '%s'", cap);
+        return i;
+}
+
+void FAST_FUNC printf_cap(const char *pfx, unsigned cap_no)
+{
+        if (cap_no < ARRAY_SIZE(capabilities)) {
+                printf("%s%s", pfx, capabilities[cap_no]);
+                return;
+        }
+        printf("%scap_%u", pfx, cap_no);
+}
diff --git a/util-linux/setpriv.c b/util-linux/setpriv.c
index c549bcaf8..9f2793949 100644
--- a/util-linux/setpriv.c
+++ b/util-linux/setpriv.c
@@ -5,7 +5,6 @@
  * Copyright (C) 2017 by  <assafgordon@gmail.com>
  *
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
- *
  */
 //config:config SETPRIV
 //config:       bool "setpriv (3.4 kb)"
@@ -131,49 +130,6 @@ struct caps {
         int u32s;
 };
 
-# if ENABLE_FEATURE_SETPRIV_CAPABILITY_NAMES
-static const char *const capabilities[] = {
-        "chown",
-        "dac_override",
-        "dac_read_search",
-        "fowner",
-        "fsetid",
-        "kill",
-        "setgid",
-        "setuid",
-        "setpcap",
-        "linux_immutable",
-        "net_bind_service",
-        "net_broadcast",
-        "net_admin",
-        "net_raw",
-        "ipc_lock",
-        "ipc_owner",
-        "sys_module",
-        "sys_rawio",
-        "sys_chroot",
-        "sys_ptrace",
-        "sys_pacct",
-        "sys_admin",
-        "sys_boot",
-        "sys_nice",
-        "sys_resource",
-        "sys_time",
-        "sys_tty_config",
-        "mknod",
-        "lease",
-        "audit_write",
-        "audit_control",
-        "setfcap",
-        "mac_override",
-        "mac_admin",
-        "syslog",
-        "wake_alarm",
-        "block_suspend",
-        "audit_read",
-};
-# endif /* FEATURE_SETPRIV_CAPABILITY_NAMES */
-
 static void getcaps(struct caps *caps)
 {
         static const uint8_t versions[] = {
@@ -211,10 +167,8 @@ static void getcaps(struct caps *caps)
                 bb_simple_perror_msg_and_die("capget");
 }
 
-static unsigned long parse_cap(const char *cap)
+static unsigned parse_cap(const char *cap)
 {
-        unsigned long i;
-
         switch (cap[0]) {
         case '-':
                 break;
@@ -226,24 +180,7 @@ static unsigned long parse_cap(const char *cap)
         }
 
         cap++;
-        if ((sscanf(cap, "cap_%lu", &i)) == 1) {
-                if (!cap_valid(i))
-                        bb_error_msg_and_die("unsupported capability '%s'", cap);
-                return i;
-        }
-
-# if ENABLE_FEATURE_SETPRIV_CAPABILITY_NAMES
-        for (i = 0; i < ARRAY_SIZE(capabilities); i++) {
-                if (strcasecmp(capabilities[i], cap) != 0)
-                        continue;
-
-                if (!cap_valid(i))
-                        bb_error_msg_and_die("unsupported capability '%s'", cap);
-                return i;
-        }
-# endif
-
-        bb_error_msg_and_die("unknown capability '%s'", cap);
+        return cap_name_to_number(cap);
 }
 
 static void set_inh_caps(char *capstring)
@@ -254,7 +191,7 @@ static void set_inh_caps(char *capstring)
 
         capstring = strtok(capstring, ",");
         while (capstring) {
-                unsigned long cap;
+                unsigned cap;
 
                 cap = parse_cap(capstring);
                 if (CAP_TO_INDEX(cap) >= caps.u32s)
@@ -280,7 +217,7 @@ static void set_ambient_caps(char *string)
 
         cap = strtok(string, ",");
         while (cap) {
-                unsigned long index;
+                unsigned index;
 
                 index = parse_cap(cap);
                 if (cap[0] == '+') {
@@ -296,16 +233,7 @@ static void set_ambient_caps(char *string)
 #endif /* FEATURE_SETPRIV_CAPABILITIES */
 
 #if ENABLE_FEATURE_SETPRIV_DUMP
-# if ENABLE_FEATURE_SETPRIV_CAPABILITY_NAMES
-static void printf_cap(const char *pfx, unsigned cap_no)
-{
-        if (cap_no < ARRAY_SIZE(capabilities)) {
-                printf("%s%s", pfx, capabilities[cap_no]);
-                return;
-        }
-        printf("%scap_%u", pfx, cap_no);
-}
-# else
+# if !ENABLE_FEATURE_SETPRIV_CAPABILITY_NAMES
 #  define printf_cap(pfx, cap_no) printf("%scap_%u", (pfx), (cap_no))
 # endif