tools/updater/string.c

   1 /*
   2  *  linux/lib/string.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /*
   8  * stupid library routines.. The optimized versions should generally be found
   9  * as inline code in <asm-xx/string.h>
  10  *
  11  * These are buggy as well..
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/string.h>
  16 #include <malloc.h>
  17
  18 #define __HAVE_ARCH_BCOPY
  19 #define __HAVE_ARCH_MEMCMP
  20 #define __HAVE_ARCH_MEMCPY
  21 #define __HAVE_ARCH_MEMMOVE
  22 #define __HAVE_ARCH_MEMSET
  23 #define __HAVE_ARCH_STRCAT
  24 #define __HAVE_ARCH_STRCMP
  25 #define __HAVE_ARCH_STRCPY
  26 #define __HAVE_ARCH_STRLEN
  27 #define __HAVE_ARCH_STRNCPY
  28
  29 char * ___strtok = NULL;
  30
  31 #ifndef __HAVE_ARCH_STRCPY
  32 char * strcpy(char * dest,const char *src)
  33 {
  34         char *tmp = dest;
  35
  36         while ((*dest++ = *src++) != '\0')
  37                 /* nothing */;
  38         return tmp;
  39 }
  40 #endif
  41
  42 #ifndef __HAVE_ARCH_STRNCPY
  43 char * strncpy(char * dest,const char *src,size_t count)
  44 {
  45         char *tmp = dest;
  46
  47         while (count-- && (*dest++ = *src++) != '\0')
  48                 /* nothing */;
  49
  50         return tmp;
  51 }
  52 #endif
  53
  54 #ifndef __HAVE_ARCH_STRCAT
  55 char * strcat(char * dest, const char * src)
  56 {
  57         char *tmp = dest;
  58
  59         while (*dest)
  60                 dest++;
  61         while ((*dest++ = *src++) != '\0')
  62                 ;
  63
  64         return tmp;
  65 }
  66 #endif
  67
  68 #ifndef __HAVE_ARCH_STRNCAT
  69 char * strncat(char *dest, const char *src, size_t count)
  70 {
  71         char *tmp = dest;
  72
  73         if (count) {
  74                 while (*dest)
  75                         dest++;
  76                 while ((*dest++ = *src++)) {
  77                         if (--count == 0) {
  78                                 *dest = '\0';
  79                                 break;
  80                         }
  81                 }
  82         }
  83
  84         return tmp;
  85 }
  86 #endif
  87
  88 #ifndef __HAVE_ARCH_STRCMP
  89 int strcmp(const char * cs,const char * ct)
  90 {
  91         register signed char __res;
  92
  93         while (1) {
  94                 if ((__res = *cs - *ct++) != 0 || !*cs++)
  95                         break;
  96         }
  97
  98         return __res;
  99 }
 100 #endif
 101
 102 #ifndef __HAVE_ARCH_STRNCMP
 103 int strncmp(const char * cs,const char * ct,size_t count)
 104 {
 105         register signed char __res = 0;
 106
 107         while (count) {
 108                 if ((__res = *cs - *ct++) != 0 || !*cs++)
 109                         break;
 110                 count--;
 111         }
 112
 113         return __res;
 114 }
 115 #endif
 116
 117 #ifndef __HAVE_ARCH_STRCHR
 118 char * strchr(const char * s, int c)
 119 {
 120         for(; *s != (char) c; ++s)
 121                 if (*s == '\0')
 122                         return NULL;
 123         return (char *) s;
 124 }
 125 #endif
 126
 127 #ifndef __HAVE_ARCH_STRRCHR
 128 char * strrchr(const char * s, int c)
 129 {
 130        const char *p = s + strlen(s);
 131        do {
 132            if (*p == (char)c)
 133                return (char *)p;
 134        } while (--p >= s);
 135        return NULL;
 136 }
 137 #endif
 138
 139 #ifndef __HAVE_ARCH_STRLEN
 140 size_t strlen(const char * s)
 141 {
 142         const char *sc;
 143
 144         for (sc = s; *sc != '\0'; ++sc)
 145                 /* nothing */;
 146         return sc - s;
 147 }
 148 #endif
 149
 150 #ifndef __HAVE_ARCH_STRNLEN
 151 size_t strnlen(const char * s, size_t count)
 152 {
 153         const char *sc;
 154
 155         for (sc = s; count-- && *sc != '\0'; ++sc)
 156                 /* nothing */;
 157         return sc - s;
 158 }
 159 #endif
 160
 161 #ifndef __HAVE_ARCH_STRDUP
 162 char * strdup(const char *s)
 163 {
 164         char *new;
 165
 166         if ((s == NULL) ||
 167             ((new = malloc (strlen(s) + 1)) == NULL) ) {
 168                 return NULL;
 169         }
 170
 171         strcpy (new, s);
 172         return new;
 173 }
 174 #endif
 175
 176 #ifndef __HAVE_ARCH_STRSPN
 177 size_t strspn(const char *s, const char *accept)
 178 {
 179         const char *p;
 180         const char *a;
 181         size_t count = 0;
 182
 183         for (p = s; *p != '\0'; ++p) {
 184                 for (a = accept; *a != '\0'; ++a) {
 185                         if (*p == *a)
 186                                 break;
 187                 }
 188                 if (*a == '\0')
 189                         return count;
 190                 ++count;
 191         }
 192
 193         return count;
 194 }
 195 #endif
 196
 197 #ifndef __HAVE_ARCH_STRPBRK
 198 char * strpbrk(const char * cs,const char * ct)
 199 {
 200         const char *sc1,*sc2;
 201
 202         for( sc1 = cs; *sc1 != '\0'; ++sc1) {
 203                 for( sc2 = ct; *sc2 != '\0'; ++sc2) {
 204                         if (*sc1 == *sc2)
 205                                 return (char *) sc1;
 206                 }
 207         }
 208         return NULL;
 209 }
 210 #endif
 211
 212 #ifndef __HAVE_ARCH_STRTOK
 213 char * strtok(char * s,const char * ct)
 214 {
 215         char *sbegin, *send;
 216
 217         sbegin  = s ? s : ___strtok;
 218         if (!sbegin) {
 219                 return NULL;
 220         }
 221         sbegin += strspn(sbegin,ct);
 222         if (*sbegin == '\0') {
 223                 ___strtok = NULL;
 224                 return( NULL );
 225         }
 226         send = strpbrk( sbegin, ct);
 227         if (send && *send != '\0')
 228                 *send++ = '\0';
 229         ___strtok = send;
 230         return (sbegin);
 231 }
 232 #endif
 233
 234 #ifndef __HAVE_ARCH_MEMSET
 235 void * memset(void * s,char c,size_t count)
 236 {
 237         char *xs = (char *) s;
 238
 239         while (count--)
 240                 *xs++ = c;
 241
 242         return s;
 243 }
 244 #endif
 245
 246 #ifndef __HAVE_ARCH_BCOPY
 247 char * bcopy(const char * src, char * dest, int count)
 248 {
 249         char *tmp = dest;
 250
 251         while (count--)
 252                 *tmp++ = *src++;
 253
 254         return dest;
 255 }
 256 #endif
 257
 258 #ifndef __HAVE_ARCH_MEMCPY
 259 void * memcpy(void * dest,const void *src,size_t count)
 260 {
 261         char *tmp = (char *) dest, *s = (char *) src;
 262
 263         while (count--)
 264                 *tmp++ = *s++;
 265
 266         return dest;
 267 }
 268 #endif
 269
 270 #ifndef __HAVE_ARCH_MEMMOVE
 271 void * memmove(void * dest,const void *src,size_t count)
 272 {
 273         char *tmp, *s;
 274
 275         if (dest <= src) {
 276                 tmp = (char *) dest;
 277                 s = (char *) src;
 278                 while (count--)
 279                         *tmp++ = *s++;
 280                 }
 281         else {
 282                 tmp = (char *) dest + count;
 283                 s = (char *) src + count;
 284                 while (count--)
 285                         *--tmp = *--s;
 286                 }
 287
 288         return dest;
 289 }
 290 #endif
 291
 292 #ifndef __HAVE_ARCH_MEMCMP
 293 int memcmp(const void * cs,const void * ct,size_t count)
 294 {
 295         const unsigned char *su1, *su2;
 296         signed char res = 0;
 297
 298         for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
 299                 if ((res = *su1 - *su2) != 0)
 300                         break;
 301         return res;
 302 }
 303 #endif
 304
 305 /*
 306  * find the first occurrence of byte 'c', or 1 past the area if none
 307  */
 308 #ifndef __HAVE_ARCH_MEMSCAN
 309 void * memscan(void * addr, int c, size_t size)
 310 {
 311         unsigned char * p = (unsigned char *) addr;
 312
 313         while (size) {
 314                 if (*p == c)
 315                         return (void *) p;
 316                 p++;
 317                 size--;
 318         }
 319         return (void *) p;
 320 }
 321 #endif
 322
 323 #ifndef __HAVE_ARCH_STRSTR
 324 char * strstr(const char * s1,const char * s2)
 325 {
 326         int l1, l2;
 327
 328         l2 = strlen(s2);
 329         if (!l2)
 330                 return (char *) s1;
 331         l1 = strlen(s1);
 332         while (l1 >= l2) {
 333                 l1--;
 334                 if (!memcmp(s1,s2,l2))
 335                         return (char *) s1;
 336                 s1++;
 337         }
 338         return NULL;
 339 }
 340 #endif