genheaders: %-<width>s had been there since v6; %-*s - since v7

Please, use at least K&R C; printf had been able to left-adjust
a field for as long as stdio existed and use of '*' for variable
width had been there since v7.  Yes, the first edition of K&R
didn't cover the latter feature (it slightly predates v7), but
you are using a much later feature of the language than that -
in K&R C
static char *stoupperx(const char *s)
{
...
}
would've been spelled as
static char *stoupperx(s)
char *s;
{
...
}

While we are at it, the use of strstr() is bogus - it finds the
_first_ instance of substring, so it's a lousy fit for checking
if a string ends with given suffix...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 9 insertions, 20 deletions

diff --git a/scripts/selinux/genheaders/genheaders.c b/scripts/selinux/genheaders/genheaders.c
index fa48fabcb330..1ceedea847dd 100644
--- a/scripts/selinux/genheaders/genheaders.c
+++ b/scripts/selinux/genheaders/genheaders.c
@@ -19,8 +19,6 @@ struct security_class_mapping {
 #include "classmap.h"
 #include "initial_sid_to_string.h"
 
-#define max(x, y) (((int)(x) > (int)(y)) ? x : y)
-
 const char *progname;
 
 static void usage(void)
@@ -46,11 +44,9 @@ static char *stoupperx(const char *s)
 
 int main(int argc, char *argv[])
 {
-        int i, j, k;
+        int i, j;
         int isids_len;
         FILE *fout;
-        const char *needle = "SOCKET";
-        char *substr;
 
         progname = argv[0];
 
@@ -80,20 +76,14 @@ int main(int argc, char *argv[])
 
         for (i = 0; secclass_map[i].name; i++) {
                 struct security_class_mapping *map = &secclass_map[i];
-                fprintf(fout, "#define SECCLASS_%s", map->name);
-                for (j = 0; j < max(1, 40 - strlen(map->name)); j++)
-                        fprintf(fout, " ");
-                fprintf(fout, "%2d\n", i+1);
+                fprintf(fout, "#define SECCLASS_%-39s %2d\n", map->name, i+1);
         }
 
         fprintf(fout, "\n");
 
         for (i = 1; i < isids_len; i++) {
                 const char *s = initial_sid_to_string[i];
-                fprintf(fout, "#define SECINITSID_%s", s);
-                for (j = 0; j < max(1, 40 - strlen(s)); j++)
-                        fprintf(fout, " ");
-                fprintf(fout, "%2d\n", i);
+                fprintf(fout, "#define SECINITSID_%-39s %2d\n", s, i);
         }
         fprintf(fout, "\n#define SECINITSID_NUM %d\n", i-1);
         fprintf(fout, "\nstatic inline bool security_is_socket_class(u16 kern_tclass)\n");
@@ -101,9 +91,10 @@ int main(int argc, char *argv[])
         fprintf(fout, "\tbool sock = false;\n\n");
         fprintf(fout, "\tswitch (kern_tclass) {\n");
         for (i = 0; secclass_map[i].name; i++) {
+                static char s[] = "SOCKET";
                 struct security_class_mapping *map = &secclass_map[i];
-                substr = strstr(map->name, needle);
-                if (substr && strcmp(substr, needle) == 0)
+                int len = strlen(map->name), l = sizeof(s) - 1;
+                if (len >= l && memcmp(map->name + len - l, s, l) == 0)
                         fprintf(fout, "\tcase SECCLASS_%s:\n", map->name);
         }
         fprintf(fout, "\t\tsock = true;\n");
@@ -129,17 +120,15 @@ int main(int argc, char *argv[])
 
         for (i = 0; secclass_map[i].name; i++) {
                 struct security_class_mapping *map = &secclass_map[i];
+                int len = strlen(map->name);
                 for (j = 0; map->perms[j]; j++) {
                         if (j >= 32) {
                                 fprintf(stderr, "Too many permissions to fit into an access vector at (%s, %s).\n",
                                         map->name, map->perms[j]);
                                 exit(5);
                         }
-                        fprintf(fout, "#define %s__%s", map->name,
-                                map->perms[j]);
-                        for (k = 0; k < max(1, 40 - strlen(map->name) - strlen(map->perms[j])); k++)
-                                fprintf(fout, " ");
-                        fprintf(fout, "0x%08xU\n", (1<<j));
+                        fprintf(fout, "#define %s__%-*s 0x%08xU\n", map->name,
+                                39-len, map->perms[j], 1U<<j);
                 }
         }