1 files changed, 33 insertions, 0 deletions
diff --git a/src/libstddjb/byte_chr.c b/src/libstddjb/byte_chr.c
new file mode 100644
index 0000000..e9caef5
--- /dev/null
+++ b/src/libstddjb/byte_chr.c
@@ -0,0 +1,33 @@
+/* ISC license. */
+
+#include <skalibs/config.h>
+#include <skalibs/bytestr.h>
+
+#ifndef SKALIBS_FLAG_REPLACE_LIBC
+
+#include <string.h>
+
+unsigned int byte_chr (char const *s, unsigned int n, int c)
+{
+  register void *p = memchr(s, c, n) ;
+  return p ? (unsigned int)((char *)p - s) : n ;
+}
+
+#else
+
+unsigned int byte_chr (char const *s, unsigned int n, int c)
+{
+  register char ch = c ;
+  register char const *t = s ;
+
+  for (;;)
+  {
+    if (!n) break; if (*t == ch) break; ++t; --n;
+    if (!n) break; if (*t == ch) break; ++t; --n;
+    if (!n) break; if (*t == ch) break; ++t; --n;
+    if (!n) break; if (*t == ch) break; ++t; --n;
+  }
+  return t - s ;
+}
+
+#endif