dlls/msvcrt/string.c

   1 /*
   2  * MSVCRT string functions
   3  *
   4  * Copyright 1996,1998 Marcus Meissner
   5  * Copyright 1996 Jukka Iivonen
   6  * Copyright 1997,2000 Uwe Bonnes
   7  * Copyright 2000 Jon Griffiths
   8  */
   9 #include "msvcrt.h"
  10
  11
  12 DEFAULT_DEBUG_CHANNEL(msvcrt);
  13
  14 /* INTERNAL: MSVCRT_malloc() based strndup */
  15 char * MSVCRT__strndup(const char * buf, unsigned int size)
  16 {
  17   char* ret;
  18   unsigned int len = strlen(buf), max_len;
  19
  20   max_len = size <= len? size : len + 1;
  21
  22   ret = MSVCRT_malloc(max_len);
  23   if (ret)
  24   {
  25     memcpy(ret,buf,max_len);
  26     ret[max_len] = 0;
  27   }
  28   return ret;
  29 }
  30
  31 /*********************************************************************
  32  *              _strdec (MSVCRT.@)
  33  */
  34 char * __cdecl MSVCRT__strdec(const char * str1, const char * str2)
  35 {
  36   /* Hmm. While the docs suggest that the following should work... */
  37   /*  return (str2<=str1?0:str2-1); */
  38   /* ...Version 2.50.4170 (NT) from win98 constantly decrements! */
  39   str1 = str1; /* remove warning */
  40   return (char *)str2-1;
  41 }
  42
  43 /*********************************************************************
  44  *              _strdup (MSVCRT.@)
  45  */
  46 char * __cdecl MSVCRT__strdup(const char * str)
  47 {
  48     char * ret = MSVCRT_malloc(strlen(str)+1);
  49     if (ret) strcpy( ret, str );
  50     return ret;
  51 }
  52
  53 /*********************************************************************
  54  *              _strinc (MSVCRT.@)
  55  */
  56 char * __cdecl MSVCRT__strinc(const char * str)
  57 {
  58   return (char*)str+1;
  59 }
  60
  61 /*********************************************************************
  62  *              _strnextc (MSVCRT.@)
  63  */
  64 unsigned int  __cdecl MSVCRT__strnextc(const char * str)
  65 {
  66   return (unsigned int)*str;
  67 }
  68
  69 /*********************************************************************
  70  *              _strninc (MSVCRT.@)
  71  *
  72  * Return a pointer to the 'n'th character in a string
  73  */
  74 char * __cdecl MSVCRT__strninc(char * str, unsigned int n)
  75 {
  76   return str + n;
  77 }
  78
  79 /*********************************************************************
  80  *              _strnset (MSVCRT.@)
  81  */
  82 char * __cdecl MSVCRT__strnset(char * str, int value, unsigned int len)
  83 {
  84   if (len > 0 && str)
  85     while (*str && len--)
  86       *str++ = value;
  87   return str;
  88 }
  89
  90 /*********************************************************************
  91  *              _strrev (MSVCRT.@)
  92  */
  93 char * __cdecl MSVCRT__strrev (char * str)
  94 {
  95   char * p1;
  96   char * p2;
  97
  98   if (str && *str)
  99     for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2)
 100     {
 101       *p1 ^= *p2;
 102       *p2 ^= *p1;
 103       *p1 ^= *p2;
 104     }
 105
 106   return str;
 107 }
 108
 109 /*********************************************************************
 110  *              _strset (MSVCRT.@)
 111  */
 112 char *  __cdecl MSVCRT__strset (char * str, int value)
 113 {
 114   char *ptr = str;
 115   while (*ptr)
 116     *ptr++ = value;
 117
 118   return str;
 119 }
 120
 121 /*********************************************************************
 122  *              _strncnt (MSVCRT.@)
 123  */
 124 unsigned int __cdecl MSVCRT__strncnt(char * str, unsigned int max)
 125 {
 126   unsigned int len = strlen(str);
 127   return (len > max? max : len);
 128 }
 129
 130 /*********************************************************************
 131  *              _strspnp (MSVCRT.@)
 132  */
 133 char * __cdecl MSVCRT__strspnp(char * str1, char * str2)
 134 {
 135   str1 += strspn(str1,str2);
 136   return *str1? str1 : 0;
 137 }
 138
 139 /*********************************************************************
 140  *              _swab (MSVCRT.@)
 141  */
 142 void __cdecl MSVCRT__swab(char * src, char * dst, int len)
 143 {
 144   if (len > 1)
 145   {
 146     len = (unsigned)len >> 1;
 147
 148     while (len--) {
 149       *dst++ = src[1];
 150       *dst++ = *src++;
 151       src++;
 152     }
 153   }
 154 }