mktemp: add support for -u

zlib-1.2.6 Makefile uses "mktemp -u".

function                                             old     new   delta
___path_search                                         -     266    +266
mktemp_main                                          165     250     +85
tempnam                                                -      79     +79
packed_usage                                       29189   29176     -13
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 1/1 up/down: 430/-13)           Total: 417 bytes

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

diff --git a/debianutils/mktemp.c b/debianutils/mktemp.c
index 007cb1c..dbe4309 100644 (file)
--- a/debianutils/mktemp.c
+++ b/debianutils/mktemp.c
@@ -41,6 +41,7 @@
 ////usage:   "\n       -q      Fail silently on errors" - we ignore this opt
 //usage:     "\n       -t      Prepend base directory name to TEMPLATE"
 //usage:     "\n       -p DIR  Use DIR as a base directory (implies -t)"
+//usage:     "\n       -u      Do not create anything; print a name"
 //usage:     "\n"
 //usage:     "\nBase directory is: -p DIR, else $TMPDIR, else /tmp"
 //usage:
@@ -63,6 +64,7 @@ int mktemp_main(int argc UNUSED_PARAM, char **argv)
                OPT_q = 1 << 1,
                OPT_t = 1 << 2,
                OPT_p = 1 << 3,
+               OPT_u = 1 << 4,
        };
 
        path = getenv("TMPDIR");
@@ -71,7 +73,7 @@ int mktemp_main(int argc UNUSED_PARAM, char **argv)
 
        /* -q is ignored */
        opt_complementary = "?1"; /* 1 argument max */
-       opts = getopt32(argv, "dqtp:", &path);
+       opts = getopt32(argv, "dqtp:u", &path);
 
        chp = argv[optind];
        if (!chp) {
@@ -81,6 +83,22 @@ int mktemp_main(int argc UNUSED_PARAM, char **argv)
                chp = xstrdup("tmp.XXXXXX");
                opts |= OPT_t;
        }
+
+       if (opts & OPT_u) {
+               /* Remove (up to) 6 X's */
+               unsigned len = strlen(chp);
+               int cnt = len > 6 ? 6 : len;
+               while (--cnt >= 0 && chp[--len] == 'X')
+                       chp[len] = '\0';
+
+               chp = tempnam(opts & (OPT_t|OPT_p) ? path : "./", chp);
+               if (!chp)
+                       return EXIT_FAILURE;
+               if (!(opts & (OPT_t|OPT_p)))
+                       chp += 2;
+               goto ret;
+       }
+
        if (opts & (OPT_t|OPT_p))
                chp = concat_path_file(path, chp);
 
@@ -91,8 +109,7 @@ int mktemp_main(int argc UNUSED_PARAM, char **argv)
                if (mkstemp(chp) < 0)
                        return EXIT_FAILURE;
        }
-
+ ret:
        puts(chp);
-
        return EXIT_SUCCESS;
 }