pwd: implement -LP if DESKTOP

function                                             old     new   delta
pwd_main                                              41     244    +203

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

1 files changed, 51 insertions, 1 deletions

diff --git a/coreutils/pwd.c b/coreutils/pwd.c
index 739b835b5..9455975e7 100644
--- a/coreutils/pwd.c
+++ b/coreutils/pwd.c
@@ -20,13 +20,63 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
+static int logical_getcwd(void)
+{
+        struct stat st1;
+        struct stat st2;
+        char *wd;
+        char *p;
+
+        wd = getenv("PWD");
+        if (!wd || wd[0] != '/')
+                return 0;
+
+        p = wd;
+        while (*p) {
+                /* doing strstr(p, "/.") by hand is smaller and faster... */
+                if (*p++ != '/')
+                        continue;
+                if (*p != '.')
+                        continue;
+                /* we found "/.", skip to next char */
+                p++;
+                if (*p == '.')
+                        p++; /* we found "/.." */
+                if (*p == '\0' || *p == '/')
+                        return 0; /* "/./" or "/../" component: bad */
+        }
+
+        if (stat(wd, &st1) != 0)
+                return 0;
+        if (stat(".", &st2) != 0)
+                return 0;
+        if (st1.st_ino != st2.st_ino)
+                return 0;
+        if (st1.st_dev != st2.st_dev)
+                return 0;
+
+        puts(wd);
+        return 1;
+}
+
 int pwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int pwd_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 {
         char *buf;
 
+        if (ENABLE_DESKTOP) {
+                /* TODO: assume -L if $POSIXLY_CORRECT? (coreutils does that)
+                 * Rationale:
+                 * POSIX requires a default of -L, but most scripts expect -P
+                 */
+                unsigned opt = getopt32(argv, "LP");
+                if ((opt & 1) && logical_getcwd())
+                        return fflush_all();
+        }
+
         buf = xrealloc_getcwd_or_warn(NULL);
-        if (buf != NULL) {
+
+        if (buf) {
                 puts(buf);
                 free(buf);
                 return fflush_all();