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>

1 files changed, 79 insertions, 0 deletions

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);
+}