lsscsi: new applet

function                                             old     new   delta
lsscsi_main                                            -     326    +326
applet_names                                        2613    2620      +7
applet_main                                         1512    1516      +4
applet_install_loc                                   189     190      +1
packed_usage                                       31566   31560      -6
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 3/1 up/down: 338/-6)            Total: 332 bytes

Signed-off-by: Markus Gothe <nietzsche@lysator.liu.se>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 123 insertions, 0 deletions

diff --git a/miscutils/lsscsi.c b/miscutils/lsscsi.c
new file mode 100644
index 000000000..1521680ac
--- /dev/null
+++ b/miscutils/lsscsi.c
@@ -0,0 +1,123 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * lsscsi implementation for busybox
+ *
+ * Copyright (C) 2017 Markus Gothe <nietzsche@lysator.liu.se>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+//config:config LSSCSI
+//config:       bool "lsscsi"
+//config:       default y
+//config:       #select PLATFORM_LINUX
+//config:       help
+//config:         lsscsi is a utility for displaying information about SCSI buses in the
+//config:         system and devices connected to them.
+//config:
+//config:         This version uses sysfs (/sys/bus/scsi/devices) only.
+
+//applet:IF_LSSCSI(APPLET(lsscsi, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_LSSCSI) += lsscsi.o
+
+//usage:#define lsscsi_trivial_usage NOUSAGE_STR
+//usage:#define lsscsi_full_usage ""
+
+#include "libbb.h"
+
+static char *get_line(const char *filename, char *buf, unsigned *bufsize_p)
+{
+        unsigned bufsize = *bufsize_p;
+        ssize_t sz;
+
+        if ((int)(bufsize - 2) <= 0)
+                return buf;
+
+        sz = open_read_close(filename, buf, bufsize - 2);
+        if (sz < 0)
+                sz = 0;
+        buf[sz] = '\0';
+        trim(buf);
+
+        sz = strlen(buf) + 1;
+        bufsize -= sz;
+        buf += sz;
+        buf[0] = '\0';
+
+        *bufsize_p = bufsize;
+        return buf;
+}
+
+int lsscsi_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int lsscsi_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
+{
+        struct dirent *de;
+        DIR *dir;
+
+        xchdir("/sys/bus/scsi/devices");
+
+        dir = xopendir(".");
+        while ((de = readdir(dir)) != NULL) {
+                char buf[256];
+                char *ptr;
+                unsigned bufsize;
+                const char *vendor;
+                const char *type_str;
+                const char *type_name;
+                const char *model;
+                const char *rev;
+                unsigned type;
+
+                if (!isdigit(de->d_name[0]))
+                        continue;
+                if (!strchr(de->d_name, ':'))
+                        continue;
+                if (chdir(de->d_name) != 0)
+                        continue;
+
+                bufsize = sizeof(buf);
+                vendor = buf;
+                ptr = get_line("vendor", buf, &bufsize);
+                type_str = ptr;
+                ptr = get_line("type", ptr, &bufsize);
+                model = ptr;
+                ptr = get_line("model", ptr, &bufsize);
+                rev = ptr;
+                ptr = get_line("rev", ptr, &bufsize);
+
+                printf("[%s]\t", de->d_name);
+
+#define scsi_device_types \
+        "disk\0"    "tape\0"    "printer\0" "process\0" \
+        "worm\0"    "\0"        "scanner\0" "optical\0" \
+        "mediumx\0" "comms\0"   "\0"        "\0"        \
+        "storage\0" "enclosu\0" "sim dsk\0" "opti rd\0" \
+        "bridge\0"  "osd\0"     "adi\0"     "\0"        \
+        "\0"        "\0"        "\0"        "\0"        \
+        "\0"        "\0"        "\0"        "\0"        \
+        "\0"        "\0"        "wlun\0"    "no dev"
+                type = bb_strtou(type_str, NULL, 10);
+                if (errno
+                 || type >= 0x20
+                 || (type_name = nth_string(scsi_device_types, type))[0] == '\0'
+                ) {
+                        printf("(%s)\t", type_str);
+                } else {
+                        printf("%s\t", type_name);
+                }
+
+                printf("%s\t""%s\t""%s\n",
+                        vendor,
+                        model,
+                        rev
+                );
+                /* TODO: also output device column, e.g. "/dev/sdX" */
+
+                xchdir("..");
+        }
+
+        if (ENABLE_FEATURE_CLEAN_UP)
+                closedir(dir);
+
+        return EXIT_SUCCESS;
+}