1 files changed, 70 insertions, 0 deletions
diff --git a/src/skaembutils/s6-unquote.c b/src/skaembutils/s6-unquote.c
new file mode 100644
index 0000000..37c3dfb
--- /dev/null
+++ b/src/skaembutils/s6-unquote.c
@@ -0,0 +1,70 @@
+/* ISC license. */
+
+#include <skalibs/sgetopt.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/uint.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/skamisc.h>
+
+#define USAGE "s6-unquote [ -n ] [ -d delim ] string"
+
+int main (int argc, char const *const *argv)
+{
+  char const *delim = "\"" ;
+  unsigned int len, delimlen ;
+  int nl = 1 ;
+  char const *string ;
+  PROG = "s6-unquote" ;
+  {
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      register int opt = subgetopt_r(argc, argv, "nd:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'n' : nl = 0 ; break ;
+        case 'd': delim = l.arg ; break ;
+        default : strerr_dieusage(100, USAGE) ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+  }
+  if (!argc) strerr_dieusage(100, USAGE) ;
+  string = *argv ;
+  len = str_len(string) ;
+  delimlen = str_len(delim) ;
+  if (delimlen)
+  {
+    if (!len--) strerr_dief1x(100, "the empty string isn't a quoted string") ;
+    if (byte_chr(delim, delimlen, *string++) >= delimlen)
+      strerr_dief1x(100, "invalid starting quote character") ;
+  }
+  {
+    unsigned int r = 0, w = 0 ;
+    char buf[len+1] ;
+    if (!string_unquote_withdelim(buf, &w, string, len, &r, delim, delimlen))
+    {
+      char fmt[UINT_FMT] ;
+      fmt[uint_fmt(fmt, r + !!delimlen)] = 0 ;
+      strerr_diefu2sys(100, "unquote at character ", fmt) ;
+    }
+    if (delimlen)
+    {
+      if (r == len) strerr_dief1x(100, "no ending quote character") ;
+      else if (r < len - 1)
+      {
+        char fmtnum[UINT_FMT] ;
+        char fmtden[UINT_FMT] ;
+        fmtnum[uint_fmt(fmtnum, r+1)] = 0 ;
+        fmtden[uint_fmt(fmtden, len)] = 0 ;
+        strerr_warnw5x("found ending quote character at position ", fmtnum, "/", fmtden, "; ignoring remainder") ;
+      }
+    }
+    if (nl) buf[w++] = '\n' ;
+    if (allwrite(1, buf, w) < w)
+      strerr_diefu1sys(111, "write to stdout") ;
+  }
+  return 0 ;
+}