i386/libsa/string.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /* string operations */
  25
  26 #include "libsa.h"
  27
  28 void * memset(void * dst, int val, size_t len)
  29 {
  30     asm( "rep; stosb"
  31        : "=c" (len), "=D" (dst)
  32        : "0" (len), "1" (dst), "a" (val)
  33        : "memory" );
  34
  35     return dst;
  36 }
  37
  38 void * memcpy(void * dst, const void * src, size_t len)
  39 {
  40     asm( "rep; movsb"
  41        : "=c" (len), "=D" (dst), "=S" (src)
  42        : "0" (len), "1" (dst), "2" (src)
  43        : "memory" );
  44
  45     return dst;
  46 }
  47
  48 void bcopy(const void * src, void * dst, size_t len)
  49 {
  50         memcpy(dst, src, len);
  51 }
  52
  53 void bzero(void * dst, size_t len)
  54 {
  55     memset(dst, 0, len);
  56 }
  57
  58 /* #if DONT_USE_GCC_BUILT_IN_STRLEN */
  59
  60 #define tolower(c)     ((int)((c) & ~0x20))
  61 #define toupper(c)     ((int)((c) | 0x20))
  62
  63 int strlen(const char * s)
  64 {
  65         int n = 0;
  66         while (*s++) n++;
  67         return(n);
  68 }
  69
  70 /*#endif*/
  71
  72 int
  73 strcmp(const char * s1, const char * s2)
  74 {
  75         while (*s1 && (*s1 == *s2)) {
  76                 s1++;
  77                 s2++;
  78         }
  79         return (*s1 - *s2);
  80 }
  81
  82 int strncmp(const char * s1, const char * s2, size_t len)
  83 {
  84         register int n = len;
  85         while (--n >= 0 && *s1 == *s2++)
  86                 if (*s1++ == '\0')
  87                         return(0);
  88         return(n<0 ? 0 : *s1 - *--s2);
  89 }
  90
  91 char *
  92 strcpy(char * s1, const char * s2)
  93 {
  94         register char *ret = s1;
  95         while (*s1++ = *s2++)
  96                 continue;
  97         return ret;
  98 }
  99
 100 char *
 101 strncpy(char * s1, const char * s2, size_t n)
 102 {
 103         register char *ret = s1;
 104         while (n && (*s1++ = *s2++))
 105                 n--;
 106         return ret;
 107 }
 108
 109 char *
 110 strlcpy(char * s1, const char * s2, size_t n)
 111 {
 112         register char *ret = s1;
 113         while (n && (*s1++ = *s2++))
 114                 n--;
 115         if (!n) *--s1=0;
 116         return ret;
 117 }
 118
 119 int
 120 ptol(const char *str)
 121 {
 122         register int c = *str;
 123
 124         if (c <= '7' && c >= '0')
 125                 c -= '0';
 126         else if (c <= 'h' && c >= 'a')
 127                 c -= 'a';
 128         else c = 0;
 129         return c;
 130 }
 131
 132 int
 133 atoi(const char *str)
 134 {
 135         register int sum = 0;
 136         while (*str == ' ' || *str == '\t')
 137                 str++;
 138         while (*str >= '0' && *str <= '9') {
 139                 sum *= 10;
 140                 sum += *str++ - '0';
 141         }
 142         return sum;
 143 }
 144
 145 char *strncat(char *s1, const char *s2, size_t n)
 146 {
 147         register char *ret = s1;
 148         while (*s1)
 149                 s1++;
 150         while (n-- && *s2)
 151                 *s1++ = *s2++;
 152         *s1 = '\0';
 153         return ret;
 154 }
 155
 156 char *strcat(char *s1, const char *s2)
 157 {
 158         return(strncat(s1, s2, strlen(s2)));
 159 }
 160
 161 #if STRNCASECMP
 162 int strncasecmp(const char *s1, const char *s2, size_t len)
 163 {
 164         register int n = len;
 165         while (--n >= 0 && tolower(*s1) == tolower(*s2++))
 166                 if (*s1++ == '\0')
 167                         return(0);
 168         return(n<0 ? 0 : tolower(*s1) - tolower(*--s2));
 169 }
 170 #endif