1 files changed, 45 insertions, 0 deletions
diff --git a/src/skaembutils/s6-basename.c b/src/skaembutils/s6-basename.c
new file mode 100644
index 0000000..113e14b
--- /dev/null
+++ b/src/skaembutils/s6-basename.c
@@ -0,0 +1,45 @@
+/* ISC license. */
+
+#include <skalibs/sgetopt.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+#define USAGE "s6-basename [ -n ] file [ suffix ]"
+
+int main (int argc, char const *const *argv)
+{
+  stralloc sa = STRALLOC_ZERO ;
+  int nl = 1 ;
+  PROG = "s6-basename" ;
+  {
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      register int opt = subgetopt_r(argc, argv, "n", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'n' : nl = 0 ; break ;
+        default : strerr_dieusage(100, USAGE) ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+  }
+  if (!argc) strerr_dieusage(100, USAGE) ;
+  if (!sabasename(&sa, argv[0], str_len(argv[0])))
+    strerr_diefu2sys(111, "get basename of ", argv[0]) ;
+  if (argc >= 2)
+  {
+    unsigned int n = str_len(argv[1]) ;
+    if ((n < sa.len) && !byte_diff(argv[1], n, sa.s + sa.len - n))
+      sa.len -= n ;
+  }
+  if (nl && !stralloc_catb(&sa, "\n", 1))
+    strerr_diefu2sys(111, "get basename of ", argv[0]) ;
+  if (allwrite(1, sa.s, sa.len) < sa.len)
+    strerr_diefu1sys(111, "write to stdout") ;
+  return 0 ;
+}