src/dom/string.h

   1 #ifndef EL_DOM_STRING_H
   2 #define EL_DOM_STRING_H
   3
   4 #include "util/conv.h"
   5 #include "util/memory.h"
   6
   7 /* For now DOM has it's own little string library. Mostly because there are
   8  * some memory overhead associated with util/string's block-based allocation
   9  * scheme which is optimized for building strings and quickly dispose of it.
  10  * Also, at some point we need to switch to use mainly UTF-8 strings for DOM
  11  * and it needs to be possible to adapt the string library to that. --jonas */
  12
  13 struct dom_string {
  14         unsigned int length;
  15         unsigned char *string;
  16 };
  17
  18 #define INIT_DOM_STRING(strvalue, strlength) \
  19         { (strlength), (strvalue) }
  20
  21 #define STATIC_DOM_STRING(strvalue) \
  22         { sizeof(strvalue) - 1, (strvalue) }
  23
  24 static inline void
  25 set_dom_string(struct dom_string *string, unsigned char *value, size_t length)
  26 {
  27         string->string = value;
  28         string->length = length == -1 ? strlen(value) : length;
  29 }
  30
  31 static inline int
  32 dom_string_casecmp(const struct dom_string *string1, const struct dom_string *string2)
  33 {
  34         size_t length = int_min(string1->length, string2->length);
  35         size_t string_diff = c_strncasecmp(string1->string, string2->string, length);
  36
  37         /* If the lengths or strings don't match c_strncasecmp() does the
  38          * job else return which ever is bigger. */
  39         return string_diff ? string_diff : string1->length - string2->length;
  40 }
  41
  42 static inline int
  43 dom_string_ncasecmp(struct dom_string *string1, struct dom_string *string2, size_t length)
  44 {
  45         return c_strncasecmp(string1->string, string2->string, length);
  46 }
  47
  48 #define copy_dom_string(string1, string2) \
  49         set_dom_string(string1, (string2)->string, (string2)->length)
  50
  51 static inline struct dom_string *
  52 add_to_dom_string(struct dom_string *string, unsigned char *str, size_t len)
  53 {
  54         unsigned char *newstring;
  55
  56         newstring = mem_realloc(string->string, string->length + len + 1);
  57         if (!newstring)
  58                 return NULL;
  59
  60         string->string = newstring;
  61         memcpy(string->string + string->length, str, len);
  62         string->length += len;
  63         string->string[string->length] = 0;
  64
  65         return string;
  66 }
  67
  68 #define init_dom_string(string, str, len) add_to_dom_string(string, str, len)
  69
  70 #define is_dom_string_set(str) ((str)->string && (str)->length)
  71
  72 #define done_dom_string(str) \
  73         do { mem_free_set(&(str)->string, NULL); (str)->length = 0; } while (0)
  74
  75 #define isquote(c)      ((c) == '"' || (c) == '\'')
  76
  77 #endif