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[mirror_edk2.git] / StdLib / Include / string.h

/** @file\r
  The header <string.h> declares one type and several functions, and defines\r
  one macro useful for manipulating arrays of character type and other objects\r
  treated as arrays of character type.  Various methods are used for\r
  determining the lengths of the arrays, but in all cases a char * or void *\r
  argument points to the initial (lowest addressed) character of the array. If\r
  an array is accessed beyond the end of an object, the behavior is undefined.\r
\r
  Where an argument declared as size_t n specifies the length of the array for\r
  a function, n can have the value zero on a call to that function. Unless\r
  explicitly stated otherwise in the description of those functions, pointer\r
  arguments on such a call shall still have valid values.\r
\r
  For all functions declared in this header, each character shall be\r
  interpreted as if it had the type unsigned char (and therefore every possible\r
  object representation is valid and has a different value).\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
**/\r
#ifndef _STRING_H\r
#define _STRING_H\r
#include  <sys/EfiCdefs.h>\r
\r
#ifdef _EFI_SIZE_T_\r
  typedef _EFI_SIZE_T_  size_t;\r
  #undef _EFI_SIZE_T_\r
  #undef _BSD_SIZE_T_\r
#endif\r
\r
__BEGIN_DECLS\r
\r
/* ################   Copying Functions   ################################# */\r
\r
/** The memcpy function copies n characters from the object pointed to by s2\r
    into the object pointed to by s1. If copying takes place between objects\r
    that overlap, the behavior is undefined.\r
\r
    @return   The memcpy function returns the value of s1.\r
**/\r
void     *memcpy(void * __restrict s1, const void * __restrict s2, size_t n);\r
\r
/** The memmove function copies n characters from the object pointed to by s2\r
    into the object pointed to by s1. Copying takes place as if the n\r
    characters from the object pointed to by s2 are first copied into a\r
    temporary array of n characters that does not overlap the objects pointed\r
    to by s1 and s2, and then the n characters from the temporary array are\r
    copied into the object pointed to by s1.\r
\r
    @return   The memmove function returns the value of s1.\r
**/\r
void     *memmove(void *s1, const void *s2, size_t n);\r
\r
/** The strcpy function copies the string pointed to by s2 (including the\r
    terminating null character) into the array pointed to by s1. If copying\r
    takes place between objects that overlap, the behavior is undefined.\r
\r
    @return   The strcpy function returns the value of s1.\r
**/\r
char     *strcpy(char * __restrict s1, const char * __restrict s2);\r
\r
/** The strncpy function copies not more than n characters (characters that\r
    follow a null character are not copied) from the array pointed to by s2 to\r
    the array pointed to by s1. If copying takes place between objects that\r
    overlap, the behavior is undefined.\r
\r
    If the array pointed to by s2 is a string that is shorter than n\r
    characters, null characters are appended to the copy in the array pointed\r
    to by s1, until n characters in all have been written.\r
\r
    @return   The strncpy function returns the value of s1.\r
**/\r
char     *strncpy(char * __restrict s1, const char * __restrict s2, size_t n);\r
\r
/** The strncpyX function copies not more than n-1 characters (characters that\r
    follow a null character are not copied) from the array pointed to by s2 to\r
    the array pointed to by s1. Array s1 is guaranteed to be NULL terminated.\r
    If copying takes place between objects that overlap,\r
    the behavior is undefined.\r
\r
    strncpyX exists because normal strncpy does not indicate if the copy was\r
    terminated because of exhausting the buffer or reaching the end of s2.\r
\r
    @return   The strncpyX function returns 0 if the copy operation was\r
              terminated because it reached the end of s1.  Otherwise,\r
              a non-zero value is returned indicating how many characters\r
              remain in s1.\r
**/\r
int       strncpyX(char * __restrict s1, const char * __restrict s2, size_t n);\r
\r
/* ################   Concatenation Functions   ########################### */\r
\r
/** The strcat function appends a copy of the string pointed to by s2\r
    (including the terminating null character) to the end of the string pointed\r
    to by s1. The initial character of s2 overwrites the null character at the\r
    end of s1. If copying takes place between objects that overlap, the\r
    behavior is undefined.\r
\r
    @return   The strcat function returns the value of s1.\r
**/\r
char     *strcat(char * __restrict s1, const char * __restrict s2);\r
\r
/** The strncat function appends not more than n characters (a null character\r
    and characters that follow it are not appended) from the array pointed to\r
    by s2 to the end of the string pointed to by s1. The initial character of\r
    s2 overwrites the null character at the end of s1. A terminating null\r
    character is always appended to the result. If copying takes place\r
    between objects that overlap, the behavior is undefined.\r
\r
    @return   The strncat function returns the value of s1.\r
**/\r
char     *strncat(char * __restrict s1, const char * __restrict s2, size_t n);\r
\r
/** The strncatX function appends not more than n characters (a null character\r
    and characters that follow it are not appended) from the array pointed to\r
    by s2 to the end of the string pointed to by s1. The initial character of\r
    s2 overwrites the null character at the end of s1. The result is always\r
    terminated with a null character. If copying takes place between objects\r
    that overlap, the behavior is undefined.\r
\r
    strncatX exists because normal strncat does not indicate if the operation\r
    was terminated because of exhausting n or reaching the end of s2.\r
\r
    @return   The strncatX function returns 0 if the operation was terminated\r
              because it reached the end of s1.  Otherwise, a non-zero value is\r
              returned indicating how many characters remain in s1.\r
**/\r
int       strncatX(char * __restrict s1, const char * __restrict s2, size_t n);\r
\r
/* ################   Comparison Functions   ############################## */\r
\r
/** The memcmp function compares the first n characters of the object pointed\r
    to by s1 to the first n characters of the object pointed to by s2.\r
\r
    @return   The memcmp function returns an integer greater than, equal to, or\r
              less than zero, accordingly as the object pointed to by s1 is\r
              greater than, equal to, or less than the object pointed to by s2.\r
**/\r
int       memcmp(const void *s1, const void *s2, size_t n);\r
\r
/** The strcmp function compares the string pointed to by s1 to the string\r
    pointed to by s2.\r
\r
    @return   The strcmp function returns an integer greater than, equal to, or\r
              less than zero, accordingly as the string pointed to by s1 is\r
              greater than, equal to, or less than the string pointed to by s2.\r
**/\r
int       strcmp(const char *s1, const char *s2);\r
\r
/** The strcoll function compares the string pointed to by s1 to the string\r
    pointed to by s2, both interpreted as appropriate to the LC_COLLATE\r
    category of the current locale.\r
\r
    @return   The strcoll function returns an integer greater than, equal to,\r
              or less than zero, accordingly as the string pointed to by s1 is\r
              greater than, equal to, or less than the string pointed to by s2\r
              when both are interpreted as appropriate to the current locale.\r
**/\r
int       strcoll(const char *s1, const char *s2);\r
\r
/** The strncmp function compares not more than n characters (characters that\r
    follow a null character are not compared) from the array pointed to by s1\r
    to the array pointed to by s2.\r
\r
    @return   The strncmp function returns an integer greater than, equal to,\r
              or less than zero, accordingly as the possibly null-terminated\r
              array pointed to by s1 is greater than, equal to, or less than\r
              the possibly null-terminated array pointed to by s2.\r
**/\r
int       strncmp(const char *s1, const char *s2, size_t n);\r
\r
/** The strxfrm function transforms the string pointed to by s2 and places the\r
    resulting string into the array pointed to by s1. The transformation is\r
    such that if the strcmp function is applied to two transformed strings, it\r
    returns a value greater than, equal to, or less than zero, corresponding to\r
    the result of the strcoll function applied to the same two original\r
    strings. No more than n characters are placed into the resulting array\r
    pointed to by s1, including the terminating null character. If n is zero,\r
    s1 is permitted to be a null pointer. If copying takes place between\r
    objects that overlap, the behavior is undefined.\r
\r
    @return   The strxfrm function returns the length of the transformed string\r
              (not including the terminating null character). If the value\r
              returned is n or more, the contents of the array pointed to by s1\r
              are indeterminate.\r
**/\r
size_t    strxfrm(char * __restrict s1, const char * __restrict s2, size_t n);\r
\r
/* ################   Search Functions   ################################## */\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     *memchr(const void *s, int c, size_t n);\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     *strchr(const char *s, int c);\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    strcspn(const char *s1, const char *s2);\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     *strpbrk(const char *s1, const char *s2);\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     *strrchr(const char *s, int c);\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    strspn(const char *s1 , const char *s2);\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     *strstr(const char *s1 , const char *s2);\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     *strtok(char * __restrict s1, const char * __restrict s2);\r
\r
/* ################   Miscellaneous Functions   ########################### */\r
\r
/** The memset function copies the value of c (converted to an unsigned char)\r
    into each of the first n characters of the object pointed to by s.\r
\r
    @return   The memset function returns the value of s.\r
**/\r
void     *memset(void *s, int c, size_t n);\r
\r
/** The strerror function maps the number in errnum to a message string.\r
    Typically, the values for errnum come from errno, but strerror shall map\r
    any value of type int to a message.\r
\r
    The implementation shall behave as if no library function calls the\r
    strerror function.\r
\r
    @return   The strerror function returns a pointer to the string, the\r
              contents of which are locale specific.  The array pointed to\r
              shall not be modified by the program, but may be overwritten by\r
              a subsequent call to the strerror function.\r
**/\r
char     *strerror(int num);\r
\r
/** The strlen function computes the length of the string pointed to by s.\r
\r
    @return   The strlen function returns the number of characters that\r
              precede the terminating null character.\r
**/\r
size_t    strlen(const char *);\r
\r
\r
/* ################   BSD Compatibility Functions   ####################### */\r
\r
char   *strdup    (const char *);\r
int     strerror_r(int, char *, size_t);\r
int     strcasecmp(const char *s1, const char *s2);\r
void   *memccpy   (void *, const void *, int, size_t);\r
int     strncasecmp(const char *s1, const char *s2, size_t n);\r
size_t  strlcpy(char *destination, const char *source, size_t size);\r
size_t  strlcat(char *destination, const char *source, size_t size);\r
\r
// bcopy is is a void function with the src/dest arguments reversed, being used in socket lib\r
#define bcopy(a,b,c) ( memcpy((void *)b, (const void *)a, (size_t)c))\r
\r
// bcmp is same as memcmp, returns 0 for successful compare, non-zero otherwise\r
#define bcmp(a,b,c) ( memcmp((void *)a, (void *)b, (size_t)c))\r
\r
/*\r
 * Get next token from string *stringp, where tokens are possibly-empty\r
 * strings separated by characters from delim.\r
 *\r
 * Writes NULs into the string at *stringp to end tokens.\r
 * delim need not remain constant from call to call.\r
 * On return, *stringp points past the last NUL written (if there might\r
 * be further tokens), or is NULL (if there are definitely no more tokens).\r
 *\r
 * If *stringp is NULL, strsep returns NULL.\r
 */\r
char *\r
strsep(\r
  register char **stringp,\r
  register const char *delim\r
  );\r
\r
__END_DECLS\r
\r
#endif  /* _STRING_H */\r