+++ /dev/null
-/** @file\r
- Search Functions for <string.h>.\r
-\r
- Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>\r
- This program and the accompanying materials are licensed and made available under\r
- the terms and conditions of the BSD License that accompanies this distribution.\r
- The full text of the license may be found at\r
- http://opensource.org/licenses/bsd-license.php.\r
-\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
-**/\r
-#include <Uefi.h>\r
-#include <Library/BaseLib.h>\r
-#include <Library/BaseMemoryLib.h>\r
-\r
-#include <LibConfig.h>\r
-#include <limits.h>\r
-#include <string.h>\r
-\r
-/** The memchr function locates the first occurrence of c (converted to an\r
- unsigned char) in the initial n characters (each interpreted as\r
- unsigned char) of the object pointed to by s.\r
-\r
- @return The memchr function returns a pointer to the located character,\r
- or a null pointer if the character does not occur in the object.\r
-**/\r
-void *\r
-memchr(const void *s, int c, size_t n)\r
-{\r
- return ScanMem8( s, (UINTN)n, (UINT8)c);\r
-}\r
-\r
-/** The strchr function locates the first occurrence of c (converted to a char)\r
- in the string pointed to by s. The terminating null character is considered\r
- to be part of the string.\r
-\r
- @return The strchr function returns a pointer to the located character,\r
- or a null pointer if the character does not occur in the string.\r
-**/\r
-char *\r
-strchr(const char *s, int c)\r
-{\r
- char tgt = (char)c;\r
-\r
- do {\r
- if( *s == tgt) {\r
- return (char *)s;\r
- }\r
- } while(*s++ != '\0');\r
- return NULL;\r
-}\r
-\r
-static UINT8 BitMask[] = {\r
- 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80\r
- };\r
-\r
-#define WHICH8(c) ((unsigned char)(c) >> 3)\r
-#define WHICH_BIT(c) (BitMask[((c) & 0x7)])\r
-#define BITMAP64 ((UINT64 *)bitmap)\r
-\r
-static\r
-void\r
-BuildBitmap(unsigned char * bitmap, const char *s2, int n)\r
-{\r
- unsigned char bit;\r
- int index;\r
-\r
- // Initialize bitmap. Bit 0 is always 1 which corresponds to '\0'\r
- for (BITMAP64[0] = index = 1; index < n; index++)\r
- BITMAP64[index] = 0;\r
-\r
- // Set bits in bitmap corresponding to the characters in s2\r
- for (; *s2 != '\0'; s2++) {\r
- index = WHICH8(*s2);\r
- bit = WHICH_BIT(*s2);\r
- bitmap[index] = bitmap[index] | bit;\r
- }\r
-}\r
-\r
-/** The strcspn function computes the length of the maximum initial segment of\r
- the string pointed to by s1 which consists entirely of characters not from\r
- the string pointed to by s2.\r
-\r
- @return The strcspn function returns the length of the segment.\r
-**/\r
-size_t\r
-strcspn(const char *s1, const char *s2)\r
-{\r
- UINT8 bitmap[ (((UCHAR_MAX + 1) / CHAR_BIT) + (CHAR_BIT - 1)) & ~7U];\r
- const char *str;\r
- UINT8 bit;\r
- int index;\r
-\r
- if(*s1 == '\0') return 0;\r
-\r
- BuildBitmap( bitmap, s2, sizeof(bitmap) / sizeof(UINT64));\r
-\r
- for(str = s1; ; str++) {\r
- index = WHICH8(*str);\r
- bit = WHICH_BIT(*str);\r
- if ((bitmap[index] & bit) != 0)\r
- break;\r
- }\r
- return (str - s1);\r
-}\r
-\r
-/** The strpbrk function locates the first occurrence in the string pointed to\r
- by s1 of any character from the string pointed to by s2.\r
-\r
- @return The strpbrk function returns a pointer to the character, or a\r
- null pointer if no character from s2 occurs in s1.\r
-**/\r
-char *\r
-strpbrk(const char *s1, const char *s2)\r
-{\r
- UINT8 bitmap[ (((UCHAR_MAX + 1) / CHAR_BIT) + (CHAR_BIT - 1)) & ~7U];\r
- UINT8 bit;\r
- int index;\r
-\r
- BuildBitmap( bitmap, s2, sizeof(bitmap) / sizeof(UINT64));\r
-\r
- for( ; *s1 != '\0'; ++s1) {\r
- index = WHICH8(*s1);\r
- bit = WHICH_BIT(*s1);\r
- if( (bitmap[index] & bit) != 0) {\r
- return (char *)s1;\r
- }\r
- }\r
- return NULL;\r
-}\r
-\r
-/** The strrchr function locates the last occurrence of c (converted to a char)\r
- in the string pointed to by s. The terminating null character is considered\r
- to be part of the string.\r
-\r
- @return The strrchr function returns a pointer to the character, or a\r
- null pointer if c does not occur in the string.\r
-**/\r
-char *\r
-strrchr(const char *s, int c)\r
-{\r
- char *found = NULL;\r
- char tgt = (char)c;\r
-\r
- do {\r
- if( *s == tgt) found = (char *)s;\r
- } while( *s++ != '\0');\r
-\r
- return found;\r
-}\r
-\r
-/** The strspn function computes the length of the maximum initial segment of\r
- the string pointed to by s1 which consists entirely of characters from the\r
- string pointed to by s2.\r
-\r
- @return The strspn function returns the length of the segment.\r
-**/\r
-size_t\r
-strspn(const char *s1 , const char *s2)\r
-{\r
- UINT8 bitmap[ (((UCHAR_MAX + 1) / CHAR_BIT) + (CHAR_BIT - 1)) & ~7U];\r
- size_t length = 0;\r
- int index;\r
- UINT8 bit;\r
-\r
- BuildBitmap( bitmap, s2, sizeof(bitmap) / sizeof(UINT64));\r
-\r
- for( ; *s1 != '\0'; ++s1) {\r
- index = WHICH8(*s1);\r
- bit = WHICH_BIT(*s1);\r
- if( (bitmap[index] & bit) == 0) break;\r
- ++length;\r
- }\r
- return length;\r
-}\r
-\r
-/** The strstr function locates the first occurrence in the string pointed to\r
- by s1 of the sequence of characters (excluding the terminating null\r
- character) in the string pointed to by s2.\r
-\r
- @return The strstr function returns a pointer to the located string, or a\r
- null pointer if the string is not found. If s2 points to a string\r
- with zero length, the function returns s1.\r
-**/\r
-char *\r
-strstr(const char *s1 , const char *s2)\r
-{\r
- return AsciiStrStr( s1, s2);\r
-}\r
-\r
-/** A sequence of calls to the strtok function breaks the string pointed to by\r
- s1 into a sequence of tokens, each of which is delimited by a character\r
- from the string pointed to by s2. The first call in the sequence has a\r
- non-null first argument; subsequent calls in the sequence have a null first\r
- argument. The separator string pointed to by s2 may be different from call\r
- to call.\r
-\r
- The first call in the sequence searches the string pointed to by s1 for the\r
- first character that is not contained in the current separator string\r
- pointed to by s2. If no such character is found, then there are no tokens\r
- in the string pointed to by s1 and the strtok function returns a null\r
- pointer. If such a character is found, it is the start of the first token.\r
-\r
- The strtok function then searches from there for a character that is\r
- contained in the current separator string. If no such character is found,\r
- the current token extends to the end of the string pointed to by s1, and\r
- subsequent searches for a token will return a null pointer. If such a\r
- character is found, it is overwritten by a null character, which terminates\r
- the current token. The strtok function saves a pointer to the following\r
- character, from which the next search for a token will start.\r
-\r
- Each subsequent call, with a null pointer as the value of the first\r
- argument, starts searching from the saved pointer and behaves as\r
- described above.\r
-\r
- @return The strtok function returns a pointer to the first character of a\r
- token, or a null pointer if there is no token.\r
-**/\r
-char *\r
-strtok(char * __restrict s1, const char * __restrict s2)\r
-{\r
- static char *Next = NULL;\r
- UINT8 bitmap[ (((UCHAR_MAX + 1) / CHAR_BIT) + (CHAR_BIT - 1)) & ~7U];\r
- char *Token = NULL;\r
- int index;\r
- UINT8 bit;\r
-\r
- if( (s1 == NULL)\r
- && ((s1 = Next) == NULL))\r
- {\r
- return NULL;\r
- }\r
-\r
- // s2 can be different on each call, so build the bitmap each time.\r
- BuildBitmap( bitmap, s2, sizeof(bitmap) / sizeof(UINT64));\r
-\r
- // skip leading delimiters: all chars in s2\r
- for( ; *s1 != '\0'; ++s1) {\r
- index = WHICH8(*s1);\r
- bit = WHICH_BIT(*s1);\r
- if( (bitmap[index] & bit) == 0) break;\r
- }\r
- if( *s1 != 0)\r
- {\r
- // Remember this point, it is the start of the token\r
- Token = s1++;\r
-\r
- // find the next delimiter and replace it with a '\0'\r
- for( ; *s1 != '\0'; ++s1) {\r
- index = WHICH8(*s1);\r
- bit = WHICH_BIT(*s1);\r
- if( (bitmap[index] & bit) != 0) {\r
- *s1++ = '\0';\r
- Next = s1;\r
- return Token;\r
- }\r
- }\r
- }\r
- Next = NULL;\r
- return Token;\r
-}\r
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