1 files changed, 99 insertions, 0 deletions
diff --git a/byte.c b/byte.c
new file mode 100644
index 0000000..c9d6d23
--- /dev/null
+++ b/byte.c
@@ -0,0 +1,99 @@
+#include "byte.h"
+
+/**
+	@file	byte.c
+	@author djb
+	@brief byte manipulation functions
+*/
+
+unsigned int byte_chr(char *s,register unsigned int n,int c)
+{
+  register char ch;
+  register char *t;
+
+  ch = c;
+  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;
+}
+
+void byte_copy(register char *to,register unsigned int n,register char *from)
+{
+  for (;;) {
+    if (!n) { return; } *to++ = *from++; --n;
+    if (!n) { return; } *to++ = *from++; --n;
+    if (!n) { return; } *to++ = *from++; --n;
+    if (!n) { return; } *to++ = *from++; --n;
+  }
+}
+
+void byte_copyr(register char *to,register unsigned int n,register char *from)
+{
+  to += n;
+  from += n;
+  for (;;) {
+    if (!n) { return; } *--to = *--from; --n;
+    if (!n) { return; } *--to = *--from; --n;
+    if (!n) { return; } *--to = *--from; --n;
+    if (!n) { return; } *--to = *--from; --n;
+  }
+}
+
+int byte_diff(register char *s,register unsigned int n,register char *t)
+{
+  for (;;) {
+    if (!n) { return 0; } if (*s != *t) { break; } ++s; ++t; --n;
+    if (!n) { return 0; } if (*s != *t) { break; } ++s; ++t; --n;
+    if (!n) { return 0; } if (*s != *t) { break; } ++s; ++t; --n;
+    if (!n) { return 0; } if (*s != *t) { break; } ++s; ++t; --n;
+  }
+  return ((int)(unsigned int)(unsigned char) *s)
+       - ((int)(unsigned int)(unsigned char) *t);
+}
+
+unsigned int byte_rchr(char *s,register unsigned int n,int c)
+{
+  register char ch;
+  register char *t;
+  register char *u;
+
+  ch = c;
+  t = s;
+  u = 0;
+  for (;;) {
+    if (!n) { break; } if (*t == ch) { u = t; } ++t; --n; 
+    if (!n) { break; } if (*t == ch) { u = t; } ++t; --n; 
+    if (!n) { break; } if (*t == ch) { u = t; } ++t; --n;
+    if (!n) { break; } if (*t == ch) { u = t; } ++t; --n;
+  }
+  if (!u) { u = t; }
+  return u - s;
+}
+
+void byte_zero(char *s,register unsigned int n)
+{
+  for (;;) {
+    if (!n) { break; } *s++ = 0; --n;
+    if (!n) { break; } *s++ = 0; --n;
+    if (!n) { break; } *s++ = 0; --n;
+    if (!n) { break; } *s++ = 0; --n;
+  }
+}
+
+void byte_fill(char *s,register unsigned int n,const int c)
+{
+  register char ch;
+  
+  ch = c;
+  for (;;) {
+    if (!n) { break; } *s++ = ch; --n;
+    if (!n) { break; } *s++ = ch; --n;
+    if (!n) { break; } *s++ = ch; --n;
+    if (!n) { break; } *s++ = ch; --n;
+  }
+}