[GCC-10][committed] libphobos: Fix std.path.expandTilde raising onOutOfMemory

[Iain Buclaw <ibuclaw@gdcproject.org>]

Hi,

This patch backports from mainline a fix for std.path.expandTilde
erroneously raising onOutOfMemory after failed call to `getpwnam_r()'.

Regression tested on x86_64-linux-gnu/-m32/-mx32, committed to
releases/gcc-10 branch.

Regards,
Iain.

---
libphobos/ChangeLog:

	* src/std/path.d (expandTilde): Handle more errno codes that could be
	left set by getpwnam_r.
---
 libphobos/src/std/path.d | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/libphobos/src/std/path.d b/libphobos/src/std/path.d
index 4a435efba6c..d250953ee1c 100644
--- a/libphobos/src/std/path.d
+++ b/libphobos/src/std/path.d
@@ -3850,7 +3850,7 @@ string expandTilde(string inputPath) nothrow
     version (Posix)
     {
         import core.exception : onOutOfMemoryError;
-        import core.stdc.errno : errno, ERANGE;
+        import core.stdc.errno : errno, EBADF, ENOENT, EPERM, ERANGE, ESRCH;
         import core.stdc.stdlib : malloc, free, realloc;
 
         /*  Joins a path from a C string to the remainder of path.
@@ -3950,7 +3950,7 @@ string expandTilde(string inputPath) nothrow
                 scope(exit) free(extra_memory);
 
                 passwd result;
-                while (1)
+                loop: while (1)
                 {
                     extra_memory = cast(char*) realloc(extra_memory, extra_memory_size * char.sizeof);
                     if (extra_memory == null)
@@ -3969,10 +3969,23 @@ string expandTilde(string inputPath) nothrow
                         break;
                     }
 
-                    if (errno != ERANGE &&
+                    switch (errno)
+                    {
+                        case ERANGE:
                         // On BSD and OSX, errno can be left at 0 instead of set to ERANGE
-                        errno != 0)
-                        onOutOfMemoryError();
+                        case 0:
+                            break;
+
+                        case ENOENT:
+                        case ESRCH:
+                        case EBADF:
+                        case EPERM:
+                            // The given name or uid was not found.
+                            break loop;
+
+                        default:
+                            onOutOfMemoryError();
+                    }
 
                     // extra_memory isn't large enough
                     import core.checkedint : mulu;
-- 
2.37.2