include/server/SC_Str4.h

   1 /*
   2         SuperCollider real time audio synthesis system
   3     Copyright (c) 2002 James McCartney. All rights reserved.
   4         http://www.audiosynth.com
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  19 */
  20
  21 /*  a 4 byte aligned and zero padded string allows faster string operations. */
  22
  23 #ifndef _SC_Str4_
  24 #define _SC_Str4_
  25
  26 #include "Hash.h"
  27 #include <stdio.h>
  28 #include <limits.h>
  29
  30 #ifndef _LASTCHAR_
  31 #define _LASTCHAR_
  32 #if BYTE_ORDER == LITTLE_ENDIAN
  33 const int32 kLASTCHAR = 0xFF000000;
  34 #else
  35 const int32 kLASTCHAR = 0x000000FF;
  36 #endif
  37 #endif
  38
  39
  40 void str4cpy(int32 *dst, const char *src);
  41 void mem4cpy(int32 *dst, const char *src, int charlen);
  42
  43 // returns the number of pad bytes to add to a string of a given length
  44 inline int str4padbytes(int charlen)
  45 {
  46     return 4 - (charlen & 3);
  47 }
  48
  49 // converts length in bytes to length in words
  50 inline int str4len(int charlen)
  51 {
  52         return (charlen + 4) >> 2;
  53 }
  54
  55 // returns length in words of a char *
  56 inline int str4len(const char *src)
  57 {
  58     const char *src0 = src;
  59     while (*src) { src++; }
  60     return str4len(src - src0);
  61 }
  62
  63 // returns length in words of a int32 *
  64 inline int str4len(const int32 *src)
  65 {
  66     const int32 *src0 = src;
  67     while (*src++ & kLASTCHAR) {}
  68     int wordlen = src - src0;
  69     return wordlen;
  70 }
  71
  72 // returns length in words of a int32 *
  73 inline bool str4eq(const int32 *a, const int32 *b)
  74 {
  75         while(true) {
  76                 if (*a != *b) return false;
  77                 if ((*a & kLASTCHAR) == 0) return true;
  78                 a++; b++;
  79         }
  80 }
  81
  82 // copy an int32 *
  83 inline void str4cpy(int32 *dst, const int32 *src)
  84 {
  85         int32 c;
  86         do {
  87                 *dst++ = c = *src++;
  88         } while (c & kLASTCHAR);
  89 }
  90
  91 inline int sc_atoi(const char *string)
  92 {
  93         int value = 0;
  94         if (*string == 0) return -1;
  95         uint32 c;
  96         while ((c = *string++ - '0') <= 9) {
  97                 value = value * 10 + c;
  98         }
  99         return value;
 100 }
 101
 102
 103 #endif