uboot/tools/updater/string.c
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   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
  29char * ___strtok = NULL;
  30
  31#ifndef __HAVE_ARCH_STRCPY
  32char * 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
  43char * 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
  55char * 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
  69char * 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
  89int 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
 103int 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
 118char * 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
 128char * 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
 140size_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
 151size_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
 162char * 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
 177size_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
 198char * 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
 213char * 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
 235void * 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
 247char * 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
 259void * 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
 271void * 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
 293int 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
 309void * 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
 324char * 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
 341