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annotate xen/common/string.c @ 22848:6341fe0f4e5a

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Added tag 4.1.0-rc2 for changeset 9dca60d88c63
author Keir Fraser <keir@xen.org>
date Tue Jan 25 14:06:55 2011 +0000 (2011-01-25)
parents 9fd36167ecfa
children
rev   line source
jws@381 1 /*
jws@381 2 * linux/lib/string.c
jws@381 3 *
jws@381 4 * Copyright (C) 1991, 1992 Linus Torvalds
jws@381 5 */
jws@381 6
kaf24@1248 7 #include <xen/types.h>
kaf24@1248 8 #include <xen/string.h>
kaf24@1248 9 #include <xen/ctype.h>
jws@381 10
jws@381 11 #ifndef __HAVE_ARCH_STRNICMP
jws@381 12 /**
jws@381 13 * strnicmp - Case insensitive, length-limited string comparison
jws@381 14 * @s1: One string
jws@381 15 * @s2: The other string
jws@381 16 * @len: the maximum number of characters to compare
jws@381 17 */
jws@381 18 int strnicmp(const char *s1, const char *s2, size_t len)
jws@381 19 {
jws@381 20 /* Yes, Virginia, it had better be unsigned */
jws@381 21 unsigned char c1, c2;
jws@381 22
jws@381 23 c1 = 0; c2 = 0;
jws@381 24 if (len) {
jws@381 25 do {
jws@381 26 c1 = *s1; c2 = *s2;
jws@381 27 s1++; s2++;
jws@381 28 if (!c1)
jws@381 29 break;
jws@381 30 if (!c2)
jws@381 31 break;
jws@381 32 if (c1 == c2)
jws@381 33 continue;
jws@381 34 c1 = tolower(c1);
jws@381 35 c2 = tolower(c2);
jws@381 36 if (c1 != c2)
jws@381 37 break;
jws@381 38 } while (--len);
jws@381 39 }
jws@381 40 return (int)c1 - (int)c2;
jws@381 41 }
jws@381 42 #endif
jws@381 43
kaf24@3475 44 #ifndef __HAVE_ARCH_STRLCPY
kaf24@3475 45 /**
kaf24@3475 46 * strlcpy - Copy a %NUL terminated string into a sized buffer
kaf24@3475 47 * @dest: Where to copy the string to
kaf24@3475 48 * @src: Where to copy the string from
kaf24@3475 49 * @size: size of destination buffer
kaf24@3475 50 *
kaf24@3475 51 * Compatible with *BSD: the result is always a valid
kaf24@3475 52 * NUL-terminated string that fits in the buffer (unless,
kaf24@3475 53 * of course, the buffer size is zero). It does not pad
kaf24@3475 54 * out the result like strncpy() does.
kaf24@3475 55 */
kaf24@3475 56 size_t strlcpy(char *dest, const char *src, size_t size)
kaf24@3475 57 {
kaf24@3475 58 size_t ret = strlen(src);
kaf24@3475 59
kaf24@3475 60 if (size) {
kaf24@3475 61 size_t len = (ret >= size) ? size-1 : ret;
kaf24@3475 62 memcpy(dest, src, len);
kaf24@3475 63 dest[len] = '\0';
kaf24@3475 64 }
kaf24@3475 65 return ret;
kaf24@3475 66 }
kaf24@3475 67 EXPORT_SYMBOL(strlcpy);
kaf24@3475 68 #endif
kaf24@3475 69
kfraser@13703 70 #ifndef __HAVE_ARCH_STRLCAT
jws@381 71 /**
kfraser@13703 72 * strlcat - Append a %NUL terminated string into a sized buffer
kfraser@13703 73 * @dest: Where to copy the string to
kfraser@13703 74 * @src: Where to copy the string from
kfraser@13703 75 * @size: size of destination buffer
jws@381 76 *
kfraser@13703 77 * Compatible with *BSD: the result is always a valid
kfraser@13703 78 * NUL-terminated string that fits in the buffer (unless,
kfraser@13703 79 * of course, the buffer size is zero).
jws@381 80 */
kfraser@13703 81 size_t strlcat(char *dest, const char *src, size_t size)
jws@381 82 {
kfraser@13703 83 size_t slen = strlen(src);
kfraser@13703 84 size_t dlen = strnlen(dest, size);
kfraser@13703 85 char *p = dest + dlen;
jws@381 86
kfraser@13703 87 while ((p - dest) < size)
kfraser@13703 88 if ((*p++ = *src++) == '\0')
kfraser@13703 89 break;
jws@381 90
kfraser@13703 91 if (dlen < size)
kfraser@13703 92 *(p-1) = '\0';
kfraser@13703 93
kfraser@13703 94 return slen + dlen;
jws@381 95 }
kfraser@13703 96 EXPORT_SYMBOL(strlcat);
jws@381 97 #endif
jws@381 98
jws@381 99 #ifndef __HAVE_ARCH_STRCMP
jws@381 100 /**
jws@381 101 * strcmp - Compare two strings
jws@381 102 * @cs: One string
jws@381 103 * @ct: Another string
jws@381 104 */
jws@381 105 int strcmp(const char * cs,const char * ct)
jws@381 106 {
jws@381 107 register signed char __res;
jws@381 108
jws@381 109 while (1) {
jws@381 110 if ((__res = *cs - *ct++) != 0 || !*cs++)
jws@381 111 break;
jws@381 112 }
jws@381 113
jws@381 114 return __res;
jws@381 115 }
jws@381 116 #endif
jws@381 117
jws@381 118 #ifndef __HAVE_ARCH_STRNCMP
jws@381 119 /**
jws@381 120 * strncmp - Compare two length-limited strings
jws@381 121 * @cs: One string
jws@381 122 * @ct: Another string
jws@381 123 * @count: The maximum number of bytes to compare
jws@381 124 */
jws@381 125 int strncmp(const char * cs,const char * ct,size_t count)
jws@381 126 {
jws@381 127 register signed char __res = 0;
jws@381 128
jws@381 129 while (count) {
jws@381 130 if ((__res = *cs - *ct++) != 0 || !*cs++)
jws@381 131 break;
jws@381 132 count--;
jws@381 133 }
jws@381 134
jws@381 135 return __res;
jws@381 136 }
jws@381 137 #endif
jws@381 138
jws@381 139 #ifndef __HAVE_ARCH_STRCHR
jws@381 140 /**
jws@381 141 * strchr - Find the first occurrence of a character in a string
jws@381 142 * @s: The string to be searched
jws@381 143 * @c: The character to search for
jws@381 144 */
jws@381 145 char * strchr(const char * s, int c)
jws@381 146 {
jws@381 147 for(; *s != (char) c; ++s)
jws@381 148 if (*s == '\0')
jws@381 149 return NULL;
jws@381 150 return (char *) s;
jws@381 151 }
jws@381 152 #endif
jws@381 153
jws@381 154 #ifndef __HAVE_ARCH_STRRCHR
jws@381 155 /**
jws@381 156 * strrchr - Find the last occurrence of a character in a string
jws@381 157 * @s: The string to be searched
jws@381 158 * @c: The character to search for
jws@381 159 */
jws@381 160 char * strrchr(const char * s, int c)
jws@381 161 {
jws@381 162 const char *p = s + strlen(s);
jws@381 163 do {
jws@381 164 if (*p == (char)c)
jws@381 165 return (char *)p;
jws@381 166 } while (--p >= s);
jws@381 167 return NULL;
jws@381 168 }
jws@381 169 #endif
jws@381 170
jws@381 171 #ifndef __HAVE_ARCH_STRLEN
jws@381 172 /**
jws@381 173 * strlen - Find the length of a string
jws@381 174 * @s: The string to be sized
jws@381 175 */
jws@381 176 size_t strlen(const char * s)
jws@381 177 {
jws@381 178 const char *sc;
jws@381 179
jws@381 180 for (sc = s; *sc != '\0'; ++sc)
jws@381 181 /* nothing */;
jws@381 182 return sc - s;
jws@381 183 }
jws@381 184 #endif
jws@381 185
jws@381 186 #ifndef __HAVE_ARCH_STRNLEN
jws@381 187 /**
jws@381 188 * strnlen - Find the length of a length-limited string
jws@381 189 * @s: The string to be sized
jws@381 190 * @count: The maximum number of bytes to search
jws@381 191 */
jws@381 192 size_t strnlen(const char * s, size_t count)
jws@381 193 {
jws@381 194 const char *sc;
jws@381 195
jws@381 196 for (sc = s; count-- && *sc != '\0'; ++sc)
jws@381 197 /* nothing */;
jws@381 198 return sc - s;
jws@381 199 }
jws@381 200 #endif
jws@381 201
jws@381 202 #ifndef __HAVE_ARCH_STRSPN
jws@381 203 /**
jws@381 204 * strspn - Calculate the length of the initial substring of @s which only
jws@381 205 * contain letters in @accept
jws@381 206 * @s: The string to be searched
jws@381 207 * @accept: The string to search for
jws@381 208 */
jws@381 209 size_t strspn(const char *s, const char *accept)
jws@381 210 {
jws@381 211 const char *p;
jws@381 212 const char *a;
jws@381 213 size_t count = 0;
jws@381 214
jws@381 215 for (p = s; *p != '\0'; ++p) {
jws@381 216 for (a = accept; *a != '\0'; ++a) {
jws@381 217 if (*p == *a)
jws@381 218 break;
jws@381 219 }
jws@381 220 if (*a == '\0')
jws@381 221 return count;
jws@381 222 ++count;
jws@381 223 }
jws@381 224
jws@381 225 return count;
jws@381 226 }
jws@381 227 #endif
jws@381 228
jws@381 229 #ifndef __HAVE_ARCH_STRPBRK
jws@381 230 /**
jws@381 231 * strpbrk - Find the first occurrence of a set of characters
jws@381 232 * @cs: The string to be searched
jws@381 233 * @ct: The characters to search for
jws@381 234 */
jws@381 235 char * strpbrk(const char * cs,const char * ct)
jws@381 236 {
jws@381 237 const char *sc1,*sc2;
jws@381 238
jws@381 239 for( sc1 = cs; *sc1 != '\0'; ++sc1) {
jws@381 240 for( sc2 = ct; *sc2 != '\0'; ++sc2) {
jws@381 241 if (*sc1 == *sc2)
jws@381 242 return (char *) sc1;
jws@381 243 }
jws@381 244 }
jws@381 245 return NULL;
jws@381 246 }
jws@381 247 #endif
jws@381 248
jws@381 249 #ifndef __HAVE_ARCH_STRSEP
jws@381 250 /**
jws@381 251 * strsep - Split a string into tokens
jws@381 252 * @s: The string to be searched
jws@381 253 * @ct: The characters to search for
jws@381 254 *
jws@381 255 * strsep() updates @s to point after the token, ready for the next call.
jws@381 256 *
jws@381 257 * It returns empty tokens, too, behaving exactly like the libc function
jws@381 258 * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
jws@381 259 * Same semantics, slimmer shape. ;)
jws@381 260 */
jws@381 261 char * strsep(char **s, const char *ct)
jws@381 262 {
jws@381 263 char *sbegin = *s, *end;
jws@381 264
jws@381 265 if (sbegin == NULL)
jws@381 266 return NULL;
jws@381 267
jws@381 268 end = strpbrk(sbegin, ct);
jws@381 269 if (end)
jws@381 270 *end++ = '\0';
jws@381 271 *s = end;
jws@381 272
jws@381 273 return sbegin;
jws@381 274 }
jws@381 275 #endif
jws@381 276
jws@381 277 #ifndef __HAVE_ARCH_MEMSET
jws@381 278 /**
jws@381 279 * memset - Fill a region of memory with the given value
jws@381 280 * @s: Pointer to the start of the area.
jws@381 281 * @c: The byte to fill the area with
jws@381 282 * @count: The size of the area.
jws@381 283 *
jws@381 284 * Do not use memset() to access IO space, use memset_io() instead.
jws@381 285 */
jws@381 286 void * memset(void * s,int c,size_t count)
jws@381 287 {
jws@381 288 char *xs = (char *) s;
jws@381 289
jws@381 290 while (count--)
jws@381 291 *xs++ = c;
jws@381 292
jws@381 293 return s;
jws@381 294 }
jws@381 295 #endif
jws@381 296
kaf24@3466 297 #ifndef __HAVE_ARCH_MEMCPY
jws@381 298 /**
jws@381 299 * memcpy - Copy one area of memory to another
jws@381 300 * @dest: Where to copy to
jws@381 301 * @src: Where to copy from
jws@381 302 * @count: The size of the area.
jws@381 303 *
jws@381 304 * You should not use this function to access IO space, use memcpy_toio()
jws@381 305 * or memcpy_fromio() instead.
jws@381 306 */
jws@381 307 void * memcpy(void * dest,const void *src,size_t count)
jws@381 308 {
jws@381 309 char *tmp = (char *) dest, *s = (char *) src;
jws@381 310
jws@381 311 while (count--)
jws@381 312 *tmp++ = *s++;
jws@381 313
jws@381 314 return dest;
jws@381 315 }
kaf24@3466 316 #endif
jws@381 317
jws@381 318 #ifndef __HAVE_ARCH_MEMMOVE
jws@381 319 /**
jws@381 320 * memmove - Copy one area of memory to another
jws@381 321 * @dest: Where to copy to
jws@381 322 * @src: Where to copy from
jws@381 323 * @count: The size of the area.
jws@381 324 *
jws@381 325 * Unlike memcpy(), memmove() copes with overlapping areas.
jws@381 326 */
jws@381 327 void * memmove(void * dest,const void *src,size_t count)
jws@381 328 {
jws@381 329 char *tmp, *s;
jws@381 330
jws@381 331 if (dest <= src) {
jws@381 332 tmp = (char *) dest;
jws@381 333 s = (char *) src;
jws@381 334 while (count--)
jws@381 335 *tmp++ = *s++;
jws@381 336 }
jws@381 337 else {
jws@381 338 tmp = (char *) dest + count;
jws@381 339 s = (char *) src + count;
jws@381 340 while (count--)
jws@381 341 *--tmp = *--s;
jws@381 342 }
jws@381 343
jws@381 344 return dest;
jws@381 345 }
jws@381 346 #endif
jws@381 347
jws@381 348 #ifndef __HAVE_ARCH_MEMCMP
jws@381 349 /**
jws@381 350 * memcmp - Compare two areas of memory
jws@381 351 * @cs: One area of memory
jws@381 352 * @ct: Another area of memory
jws@381 353 * @count: The size of the area.
jws@381 354 */
jws@381 355 int memcmp(const void * cs,const void * ct,size_t count)
jws@381 356 {
jws@381 357 const unsigned char *su1, *su2;
jws@381 358 int res = 0;
jws@381 359
jws@381 360 for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
jws@381 361 if ((res = *su1 - *su2) != 0)
jws@381 362 break;
jws@381 363 return res;
jws@381 364 }
jws@381 365 #endif
jws@381 366
jws@381 367 #ifndef __HAVE_ARCH_MEMSCAN
jws@381 368 /**
jws@381 369 * memscan - Find a character in an area of memory.
jws@381 370 * @addr: The memory area
jws@381 371 * @c: The byte to search for
jws@381 372 * @size: The size of the area.
jws@381 373 *
jws@381 374 * returns the address of the first occurrence of @c, or 1 byte past
jws@381 375 * the area if @c is not found
jws@381 376 */
jws@381 377 void * memscan(void * addr, int c, size_t size)
jws@381 378 {
jws@381 379 unsigned char * p = (unsigned char *) addr;
jws@381 380
jws@381 381 while (size) {
jws@381 382 if (*p == c)
jws@381 383 return (void *) p;
jws@381 384 p++;
jws@381 385 size--;
jws@381 386 }
jws@381 387 return (void *) p;
jws@381 388 }
jws@381 389 #endif
jws@381 390
jws@381 391 #ifndef __HAVE_ARCH_STRSTR
jws@381 392 /**
jws@381 393 * strstr - Find the first substring in a %NUL terminated string
jws@381 394 * @s1: The string to be searched
jws@381 395 * @s2: The string to search for
jws@381 396 */
jws@381 397 char * strstr(const char * s1,const char * s2)
jws@381 398 {
jws@381 399 int l1, l2;
jws@381 400
jws@381 401 l2 = strlen(s2);
jws@381 402 if (!l2)
jws@381 403 return (char *) s1;
jws@381 404 l1 = strlen(s1);
jws@381 405 while (l1 >= l2) {
jws@381 406 l1--;
jws@381 407 if (!memcmp(s1,s2,l2))
jws@381 408 return (char *) s1;
jws@381 409 s1++;
jws@381 410 }
jws@381 411 return NULL;
jws@381 412 }
jws@381 413 #endif
jws@381 414
jws@381 415 #ifndef __HAVE_ARCH_MEMCHR
jws@381 416 /**
jws@381 417 * memchr - Find a character in an area of memory.
jws@381 418 * @s: The memory area
jws@381 419 * @c: The byte to search for
jws@381 420 * @n: The size of the area.
jws@381 421 *
jws@381 422 * returns the address of the first occurrence of @c, or %NULL
jws@381 423 * if @c is not found
jws@381 424 */
jws@381 425 void *memchr(const void *s, int c, size_t n)
jws@381 426 {
jws@381 427 const unsigned char *p = s;
jws@381 428 while (n-- != 0) {
jws@381 429 if ((unsigned char)c == *p++) {
jws@381 430 return (void *)(p-1);
jws@381 431 }
jws@381 432 }
jws@381 433 return NULL;
jws@381 434 }
jws@381 435
jws@381 436 #endif
kaf24@3952 437
kaf24@3952 438 /*
kaf24@3952 439 * Local variables:
kaf24@3952 440 * mode: C
kaf24@3952 441 * c-set-style: "BSD"
kaf24@3952 442 * c-basic-offset: 8
kaf24@3952 443 * tab-width: 8
kaf24@3952 444 * indent-tabs-mode: t
kaf24@4026 445 * End:
kaf24@3952 446 */