stat: make stat -f show filesystem "ID:" as coreutils does

print_statfs                                         358     370     +12

1 files changed, 21 insertions, 6 deletions

diff --git a/coreutils/stat.c b/coreutils/stat.c
index c34c06acb..4c729e071 100644
--- a/coreutils/stat.c
+++ b/coreutils/stat.c
@@ -139,6 +139,20 @@ static void printfs(char *pformat, const char *msg)
         printf(pformat, msg);
 }
 
+/* "man statfs" says that statfsbuf->f_fsid is a mess */
+/* coreutils treats it as an array of ints, most significant first */
+static unsigned long long get_f_fsid(const struct statfs *statfsbuf)
+{
+        const unsigned *p = (const void*) &statfsbuf->f_fsid;
+        unsigned sz = sizeof(statfsbuf->f_fsid) / sizeof(unsigned);
+        unsigned long long r = 0;
+
+        do
+                r = (r << (sizeof(unsigned)*8)) | *p++;
+        while (--sz > 0);
+        return r;
+}
+
 /* print statfs info */
 static void print_statfs(char *pformat, const char m,
                 const char *const filename, const void *data
@@ -148,11 +162,11 @@ static void print_statfs(char *pformat, const char m,
         if (m == 'n') {
                 printfs(pformat, filename);
         } else if (m == 'i') {
-                strcat(pformat, "Lx");
-                printf(pformat, statfsbuf->f_fsid);
+                strcat(pformat, "llx");
+                printf(pformat, get_f_fsid(statfsbuf));
         } else if (m == 'l') {
                 strcat(pformat, "lu");
-                printf(pformat, statfsbuf->f_namelen);
+                printf(pformat, (unsigned long) (statfsbuf->f_namelen));
         } else if (m == 't') {
                 strcat(pformat, "lx");
                 printf(pformat, (unsigned long) (statfsbuf->f_type)); /* no equiv */
@@ -349,10 +363,11 @@ static void print_it(const char *masterformat, const char *filename,
 #endif
 static bool do_statfs(const char *filename, const char *format)
 {
+        struct statfs statfsbuf;
+
 #if !ENABLE_FEATURE_STAT_FORMAT
         const char *format;
 #endif
-        struct statfs statfsbuf;
 #if ENABLE_SELINUX
         security_context_t scontext = NULL;
 
@@ -406,10 +421,10 @@ static bool do_statfs(const char *filename, const char *format)
         format = (option_mask32 & OPT_TERSE
                 ? "%s %llx %lu "
                 : "  File: \"%s\"\n"
-                  "    ID: %-8Lx Namelen: %-7lu ");
+                  "    ID: %-8llx Namelen: %-7lu ");
         printf(format,
                filename,
-               statfsbuf.f_fsid,
+               get_f_fsid(&statfsbuf),
                statfsbuf.f_namelen);
 
         if (option_mask32 & OPT_TERSE)