1 files changed, 184 insertions, 0 deletions
diff --git a/3rd_party/libsrp6a-sha512/cstr.c b/3rd_party/libsrp6a-sha512/cstr.c
new file mode 100644
index 0000000..58a5638
--- /dev/null
+++ b/3rd_party/libsrp6a-sha512/cstr.c
@@ -0,0 +1,184 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "config.h"
+#include "cstr.h"
+
+#define EXPFACTOR	2		/* Minimum expansion factor */
+#define MINSIZE		4		/* Absolute minimum - one word */
+
+static char cstr_empty_string[] = { '\0' };
+
+_TYPE( cstr * )
+cstr_new()
+{
+  cstr * str;
+
+  str = (cstr *) malloc(sizeof(cstr));
+  if(str) {
+    str->data = cstr_empty_string;
+    str->length = str->cap = 0;
+    str->ref = 1;
+  }
+  return str;
+}
+
+_TYPE( cstr * )
+cstr_dup(const cstr * str)
+{
+  cstr * nstr = cstr_new();
+  if(nstr)
+    cstr_setn(nstr, str->data, str->length);
+  return nstr;
+}
+
+_TYPE( cstr * )
+cstr_create(const char * s)
+{
+  return cstr_createn(s, strlen(s));
+}
+
+_TYPE( cstr * )
+cstr_createn(const char * s, int len)
+{
+  cstr * str = cstr_new();
+  if(str) {
+    cstr_setn(str, s, len);
+  }
+  return str;
+}
+
+_TYPE( void )
+cstr_use(cstr * str)
+{
+  ++str->ref;
+}
+
+_TYPE( void )
+cstr_clear_free(cstr * str)
+{
+  if(--str->ref == 0) {
+    if(str->cap > 0) {
+      memset(str->data, 0, str->cap);
+      free(str->data);
+    }
+    free(str);
+  }
+}
+
+_TYPE( void )
+cstr_free(cstr * str)
+{
+  if(--str->ref == 0) {
+    if(str->cap > 0)
+      free(str->data);
+    free(str);
+  }
+}
+
+_TYPE( void )
+cstr_empty(cstr * str)
+{
+  if(str->cap > 0)
+    free(str->data);
+  str->data = cstr_empty_string;
+  str->length = str->cap = 0;
+}
+
+static int
+cstr_alloc(cstr * str, int len)
+{
+  char * t;
+
+  if(len > str->cap) {
+    if(len < EXPFACTOR * str->cap)
+      len = EXPFACTOR * str->cap;
+    if(len < MINSIZE)
+      len = MINSIZE;
+
+    t = (char *) malloc(len * sizeof(char));
+    if(t) {
+      if(str->data) {
+	t[str->length] = 0;
+	if(str->cap > 0) {
+	  if(str->length > 0)
+	    memcpy(t, str->data, str->length);
+	  free(str->data);
+	}
+      }
+      str->data = t;
+      str->cap = len;
+      return 1;
+    }
+    else
+      return -1;
+  }
+  else
+    return 0;
+}
+
+_TYPE( int )
+cstr_copy(cstr * dst, const cstr * src)
+{
+  return cstr_setn(dst, src->data, src->length);
+}
+
+_TYPE( int )
+cstr_set(cstr * str, const char * s)
+{
+  return cstr_setn(str, s, strlen(s));
+}
+
+_TYPE( int )
+cstr_setn(cstr * str, const char * s, int len)
+{
+  if(cstr_alloc(str, len + 1) < 0)
+    return -1;
+  str->data[len] = 0;
+  if(s != NULL && len > 0)
+    memmove(str->data, s, len);
+  str->length = len;
+  return 1;
+}
+
+_TYPE( int )
+cstr_set_length(cstr * str, int len)
+{
+  if(len < str->length) {
+    str->data[len] = 0;
+    str->length = len;
+    return 1;
+  }
+  else if(len > str->length) {
+    if(cstr_alloc(str, len + 1) < 0)
+      return -1;
+    memset(str->data + str->length, 0, len - str->length + 1);
+    str->length = len;
+    return 1;
+  }
+  else
+    return 0;
+}
+
+_TYPE( int )
+cstr_append(cstr * str, const char * s)
+{
+  return cstr_appendn(str, s, strlen(s));
+}
+
+_TYPE( int )
+cstr_appendn(cstr * str, const char * s, int len)
+{
+  if(cstr_alloc(str, str->length + len + 1) < 0)
+    return -1;
+  memcpy(str->data + str->length, s, len);
+  str->length += len;
+  str->data[str->length] = 0;
+  return 1;
+}
+
+_TYPE( int )
+cstr_append_str(cstr * dst, const cstr * src)
+{
+  return cstr_appendn(dst, src->data, src->length);
+}