passwd: rework:

* do not make backup copy by copying (just retain old file)
* correctly fall back to /etc/passwd if user is not in shadow
* fix bug with overlong passwd entries
* be permissive on some kinds of failures
* reduce stack usage
* code size: -500 bytes

3 files changed, 13 insertions, 13 deletions

diff --git a/libbb/bb_askpass.c b/libbb/bb_askpass.c
index cf384e52b..097a0a290 100644
--- a/libbb/bb_askpass.c
+++ b/libbb/bb_askpass.c
@@ -60,7 +60,7 @@ char *bb_askpass(int timeout, const char * prompt)
                    (read did not overwrite it) */
                 do {
                         if (passwd[i] == '\r' || passwd[i] == '\n')
-                                passwd[i] = 0;
+                                passwd[i] = '\0';
                 } while (passwd[i++]);
         }
 
diff --git a/libbb/get_line_from_file.c b/libbb/get_line_from_file.c
index 969d808cf..b424d59e9 100644
--- a/libbb/get_line_from_file.c
+++ b/libbb/get_line_from_file.c
@@ -9,11 +9,9 @@
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include <stdio.h>
-#include <stdlib.h>
 #include "libbb.h"
 
-/* get_line_from_file() - This function reads an entire line from a text file,
+/* This function reads an entire line from a text file,
  * up to a newline or NUL byte.  It returns a malloc'ed char * which must be
  * stored and free'ed  by the caller.  If end is null '\n' isn't considered
  * end of line.  If end isn't null, length of the chunk read is stored in it. */
@@ -37,10 +35,12 @@ char *bb_get_chunk_from_file(FILE * file, int *end)
         if (end)
                 *end = idx;
         if (linebuf) {
-                if (ferror(file)) {
-                        free(linebuf);
-                        return NULL;
-                }
+                // huh, is fgets discards prior data on error like this?
+                // I don't think so....
+                //if (ferror(file)) {
+                //      free(linebuf);
+                //      return NULL;
+                //}
                 linebuf = xrealloc(linebuf, idx+1);
                 linebuf[idx] = 0;
         }
diff --git a/libbb/obscure.c b/libbb/obscure.c
index 7d839d624..2599095df 100644
--- a/libbb/obscure.c
+++ b/libbb/obscure.c
@@ -157,14 +157,14 @@ static const char *obscure_msg(const char *old_p, const char *new_p, const struc
         return NULL;
 }
 
-int obscure(const char *old, const char *newval, const struct passwd *pwdp)
+int obscure(const char *old, const char *newval, const struct passwd *pw)
 {
         const char *msg;
 
-        if ((msg = obscure_msg(old, newval, pwdp))) {
-                printf("Bad password: %s.\n", msg);
-                /* If user is root warn only */
-                return getuid() ? 1 : 0;
+        msg = obscure_msg(old, newval, pw);
+        if (msg) {
+                printf("Bad password: %s\n", msg);
+                return 1;
         }
         return 0;
 }