1 files changed, 135 insertions, 0 deletions
diff --git a/src/str.c b/src/str.c
new file mode 100644
index 0000000..7d5ab5e
--- /dev/null
+++ b/src/str.c
@@ -0,0 +1,135 @@
+#include "str.h"
+#include "stralloc.h"
+
+/**
+	@file str.c
+	@author djb
+	@source qmail
+	@brief string handling functions
+*/
+
+unsigned int str_copy(register char *s,register const char *t)
+{
+  register int len;
+
+  len = 0;
+  for (;;) {
+    if (!(*s = *t)) { return len; } ++s; ++t; ++len; 
+    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
+    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
+    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
+  }
+}
+
+unsigned int str_copyb(register char *s,register const char *t,unsigned int max)
+{
+  register int len;
+
+  len = 0;
+
+  while (max-- > 0) {
+    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
+    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
+    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
+    if (!(*s = *t)) { return len; } ++s; ++t; ++len;
+  }
+
+  return len;
+}
+
+int str_diff(register const char *s,register const char *t)
+{
+  register char x;
+
+  for (;;) {
+    x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
+    x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
+    x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
+    x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
+  }
+  return ((int)(unsigned int)(unsigned char) x)
+       - ((int)(unsigned int)(unsigned char) *t);
+}
+
+int str_diffn(register const char *s,register const char *t,unsigned int len)
+{
+  register char x;
+
+  for (;;) {
+    if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
+    if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
+    if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
+    if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
+  }
+  return ((int)(unsigned int)(unsigned char) x)
+       - ((int)(unsigned int)(unsigned char) *t);
+}
+
+unsigned int str_len(register const char *s)
+{
+  register const char *t;
+
+  t = s;
+  for (;;) {
+    if (!*t) { return t - s; } ++t;
+    if (!*t) { return t - s; } ++t;
+    if (!*t) { return t - s; } ++t;
+    if (!*t) { return t - s; } ++t;
+  }
+}
+
+unsigned int str_chr(register const char *s,int c)
+{
+  register char ch;
+  register const char *t;
+
+  ch = c;
+  t = s;
+  for (;;) {
+    if (!*t) { break; } if (*t == ch) { break; } ++t;
+    if (!*t) { break; } if (*t == ch) { break; } ++t;
+    if (!*t) { break; } if (*t == ch) { break; } ++t;
+    if (!*t) { break; } if (*t == ch) { break; } ++t;
+  }
+  return t - s;
+}
+
+unsigned int str_rchr(register const char *s,int c)
+{
+  register char ch;
+  register const char *t;
+  register const char *u;
+
+  ch = c;
+  t = s;
+  u = 0;
+  for (;;) {
+    if (!*t) { break; } if (*t == ch) { u = t; } ++t;
+    if (!*t) { break; } if (*t == ch) { u = t; } ++t;
+    if (!*t) { break; } if (*t == ch) { u = t; } ++t;
+    if (!*t) { break; } if (*t == ch) { u = t; } ++t;
+  }
+  if (!u) u = t;
+  return u - s;
+}
+
+int str_start(register const char *s,register const char *t)
+{
+  register char x;
+
+  for (;;) {
+    x = *t++; if (!x) return 1; if (x != *s++) return 0;
+    x = *t++; if (!x) return 1; if (x != *s++) return 0;
+    x = *t++; if (!x) return 1; if (x != *s++) return 0;
+    x = *t++; if (!x) return 1; if (x != *s++) return 0;
+  }
+}
+
+char *str_append(char *dest, char const *s)
+{
+  static stralloc sa = {0};
+
+  stralloc_copys(&sa,dest);
+  stralloc_catb(&sa,s,sizeof(s));
+  return sa.s;
+}