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qemu / edk2 / d7c0dfaef26ca1693529360ed6c6de0021e19595 / . / StdLib / Include / string.h
blob: 0c809441e830fa6c7dcdff245cfdffcd440cb1f2 [file] [log] [blame]
/** @file
The header <string.h> declares one type and several functions, and defines
one macro useful for manipulating arrays of character type and other objects
treated as arrays of character type. Various methods are used for
determining the lengths of the arrays, but in all cases a char * or void *
argument points to the initial (lowest addressed) character of the array. If
an array is accessed beyond the end of an object, the behavior is undefined.
Where an argument declared as size_t n specifies the length of the array for
a function, n can have the value zero on a call to that function. Unless
explicitly stated otherwise in the description of those functions, pointer
arguments on such a call must still have valid values.
For all functions declared in this header, each character shall be
interpreted as if it had the type unsigned char (and therefore every possible
object representation is valid and has a different value).
The following macros are defined in this file:<BR>
@verbatim
NULL
bcopy(a,b,c) ( memcpy((void *)b, (const void *)a, (size_t)c))
bcmp(a,b,c) ( memcmp((void *)a, (void *)b, (size_t)c))
@endverbatim
The following types are defined in this file:<BR>
@verbatim
size_t Unsigned integer type of the result of the sizeof operator.
@endverbatim
The following functions are declared in this file:<BR>
@verbatim
################ Copying Functions
void *memcpy (void * __restrict s1, const void * __restrict s2, size_t n);
void *memmove (void *s1, const void *s2, size_t n);
char *strcpy (char * __restrict s1, const char * __restrict s2);
char *strncpy (char * __restrict s1, const char * __restrict s2, size_t n);
int strncpyX (char * __restrict s1, const char * __restrict s2, size_t n);
################ Concatenation Functions
char *strcat (char * __restrict s1, const char * __restrict s2);
char *strncat (char * __restrict s1, const char * __restrict s2, size_t n);
int strncatX (char * __restrict s1, const char * __restrict s2, size_t n);
################ Comparison Functions
int memcmp (const void *s1, const void *s2, size_t n);
int strcmp (const char *s1, const char *s2);
int strcoll (const char *s1, const char *s2);
int strncmp (const char *s1, const char *s2, size_t n);
size_t strxfrm (char * __restrict s1, const char * __restrict s2, size_t n);
################ Search Functions
void *memchr (const void *s, int c, size_t n);
char *strchr (const char *s, int c);
size_t strcspn (const char *s1, const char *s2);
char *strpbrk (const char *s1, const char *s2);
char *strrchr (const char *s, int c);
size_t strspn (const char *s1 , const char *s2);
char *strstr (const char *s1 , const char *s2);
char *strtok (char * __restrict s1, const char * __restrict s2);
################ Miscellaneous Functions
void *memset (void *s, int c, size_t n);
char *strerror (int num);
size_t strlen (const char *);
################ BSD Compatibility Functions
char *strdup (const char *);
int strerror_r (int, char *, size_t);
int strcasecmp (const char *s1, const char *s2);
void *memccpy (void *, const void *, int, size_t);
int strncasecmp (const char *s1, const char *s2, size_t n);
size_t strlcpy (char *destination, const char *source, size_t size);
size_t strlcat (char *destination, const char *source, size_t size);
char *strsep (register char **stringp, register const char *delim);
@endverbatim
Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available under
the terms and conditions of the BSD License that accompanies this distribution.
The full text of the license may be found at
http://opensource.org/licenses/bsd-license.
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#ifndef _STRING_H
#define _STRING_H
#include <sys/EfiCdefs.h>
#ifdef _EFI_SIZE_T_
typedef _EFI_SIZE_T_ size_t;
#undef _EFI_SIZE_T_
#undef _BSD_SIZE_T_
#endif
__BEGIN_DECLS
/* ################ Copying Functions ################################# */
/** The memcpy function copies N characters from the object pointed to by Src
into the object pointed to by Dest. If copying takes place between objects
that overlap, the behavior is undefined.
@param[out] Dest Pointer to the destination of the copy operation.
@param[in] Src Pointer to the Source data to be copied.
@param[in] N Number of characters (bytes) to be copied.
@return The memcpy function returns the value of Dest.
**/
void *memcpy(void * __restrict Dest, const void * __restrict Src, size_t N);
/** The memmove function copies N characters from the object pointed to by Src
into the object pointed to by Dest. Copying takes place as if the N
characters from the object pointed to by Src are first copied into a
temporary array of N characters that does not overlap the objects pointed
to by Dest and Src, and then the N characters from the temporary array are
copied into the object pointed to by Dest.
@param[out] Dest Pointer to the destination of the copy operation.
@param[in] Src Pointer to the Source data to be copied.
@param[in] N Number of characters (bytes) to be copied.
@return The memmove function returns the value of Dest.
**/
void *memmove(void *Dest, const void *Src, size_t N);
/** The strcpy function copies the string pointed to by Src (including the
terminating null character) into the array pointed to by Dest. If copying
takes place between objects that overlap, the behavior is undefined.
@param[out] Dest Pointer to the destination of the copy operation.
@param[in] Src Pointer to the Source data to be copied.
@return The strcpy function returns the value of Dest.
**/
char *strcpy(char * __restrict Dest, const char * __restrict Src);
/** The strncpy function copies not more than N characters (characters that
follow a null character are not copied) from the array pointed to by Src to
the array pointed to by Dest. If copying takes place between objects that
overlap, the behavior is undefined.
If the array pointed to by Src is a string that is shorter than N
characters, null characters are appended to the copy in the array pointed
to by Dest, until N characters in all have been written.
@param[out] Dest Pointer to the destination of the copy operation.
@param[in] Src Pointer to the Source data to be copied.
@param[in] N Number of characters (bytes) to be copied.
@return The strncpy function returns the value of Dest.
**/
char *strncpy(char * __restrict Dest, const char * __restrict Src, size_t N);
/** The strncpyX function copies not more than N-1 characters (characters that
follow a null character are not copied) from the array pointed to by Src to
the array pointed to by Dest. Array Dest is guaranteed to be NULL terminated.
If copying takes place between objects that overlap,
the behavior is undefined.
strncpyX exists because normal strncpy does not indicate if the copy was
terminated because of exhausting the buffer or reaching the end of Src.
@param[out] Dest Pointer to the destination of the copy operation.
@param[in] Src Pointer to the Source data to be copied.
@param[in] N Number of characters (bytes) to be copied.
@return The strncpyX function returns 0 if the copy operation was
terminated because it reached the end of Dest. Otherwise,
a non-zero value is returned indicating how many characters
remain in Dest.
**/
int strncpyX(char * __restrict Dest, const char * __restrict Src, size_t N);
/* ################ Concatenation Functions ########################### */
/** The strcat function appends a copy of the string pointed to by Src
(including the terminating null character) to the end of the string pointed
to by Dest. The initial character of Src overwrites the null character at the
end of Dest. If copying takes place between objects that overlap, the
behavior is undefined.
@param[out] Dest Pointer to the destination of the concatenation operation.
@param[in] Src Pointer to the Source data to be concatenated.
@return The strcat function returns the value of Dest.
**/
char *strcat(char * __restrict Dest, const char * __restrict Src);
/** The strncat function appends not more than N characters (a null character
and characters that follow it are not appended) from the array pointed to
by Src to the end of the string pointed to by Dest. The initial character of
Src overwrites the null character at the end of Dest. A terminating null
character is always appended to the result. If copying takes place
between objects that overlap, the behavior is undefined.
@param[out] Dest Pointer to the destination of the concatenation operation.
@param[in] Src Pointer to the Source data to be concatenated.
@param[in] N Max Number of characters (bytes) to be concatenated.
@return The strncat function returns the value of Dest.
**/
char *strncat(char * __restrict Dest, const char * __restrict Src, size_t N);
/** The strncatX function appends not more than N characters (a null character
and characters that follow it are not appended) from the array pointed to
by Src to the end of the string pointed to by Dest. The initial character of
Src overwrites the null character at the end of Dest. The result is always
terminated with a null character. If copying takes place between objects
that overlap, the behavior is undefined.
strncatX exists because normal strncat does not indicate if the operation
was terminated because of exhausting N or reaching the end of Src.
@param[out] Dest Pointer to the destination of the concatenation operation.
@param[in] Src Pointer to the Source data to be concatenated.
@param[in] N Max Number of characters (bytes) to be concatenated.
@return The strncatX function returns 0 if the operation was terminated
because it reached the end of Dest. Otherwise, a non-zero value is
returned indicating how many characters remain in Dest.
**/
int strncatX(char * __restrict s1, const char * __restrict s2, size_t n);
/* ################ Comparison Functions ############################## */
/** The memcmp function compares the first N characters of the object pointed
to by S1 to the first N characters of the object pointed to by S2.
@param[out] S1 Pointer to the first object to be compared.
@param[in] S2 Pointer to the object to be compared to S1.
@param[in] N Max Number of characters (bytes) to be compared.
@return The memcmp function returns an integer greater than, equal to, or
less than zero, accordingly as the object pointed to by S1 is
greater than, equal to, or less than the object pointed to by S2.
**/
int memcmp(const void *S1, const void *S2, size_t N);
/** The strcmp function compares the string pointed to by S1 to the string
pointed to by S2.
@param[out] S1 Pointer to the first string to be compared.
@param[in] S2 Pointer to the string to be compared to S1.
@return The strcmp function returns an integer greater than, equal to, or
less than zero, accordingly as the string pointed to by S1 is
greater than, equal to, or less than the string pointed to by S2.
**/
int strcmp(const char *S1, const char *S2);
/** The strcoll function compares the string pointed to by S1 to the string
pointed to by S2, both interpreted as appropriate to the LC_COLLATE
category of the current locale.
@param[out] S1 Pointer to the first string to be compared.
@param[in] S2 Pointer to the string to be compared to S1.
@return The strcoll function returns an integer greater than, equal to,
or less than zero, accordingly as the string pointed to by S1 is
greater than, equal to, or less than the string pointed to by S2
when both are interpreted as appropriate to the current locale.
**/
int strcoll(const char *S1, const char *S2);
/** The strncmp function compares not more than N characters (characters that
follow a null character are not compared) from the array pointed to by S1
to the array pointed to by S2.
@param[out] S1 Pointer to the first object to be compared.
@param[in] S2 Pointer to the object to be compared to S1.
@param[in] N Max Number of characters (bytes) to be compared.
@return The strncmp function returns an integer greater than, equal to,
or less than zero, accordingly as the possibly null-terminated
array pointed to by S1 is greater than, equal to, or less than
the possibly null-terminated array pointed to by S2.
**/
int strncmp(const char *S1, const char *S2, size_t N);
/** The strxfrm function transforms the string pointed to by Src and places the
resulting string into the array pointed to by Dest. The transformation is
such that if the strcmp function is applied to two transformed strings, it
returns a value greater than, equal to, or less than zero, corresponding to
the result of the strcoll function applied to the same two original
strings. No more than N characters are placed into the resulting array
pointed to by Dest, including the terminating null character. If N is zero,
Dest is permitted to be a null pointer. If copying takes place between
objects that overlap, the behavior is undefined.
@param[out] Dest Pointer to the object to receive the transformed string.
@param[in] Src Pointer to the string to be transformed.
@param[in] N Max Number of characters (bytes) to be transformed.
@return The strxfrm function returns the length of the transformed string
(not including the terminating null character). If the value
returned is N or more, the contents of the array pointed to by Dest
are indeterminate.
**/
size_t strxfrm(char * __restrict Dest, const char * __restrict Src, size_t N);
/* ################ Search Functions ################################## */
/** The memchr function locates the first occurrence of C (converted to an
unsigned char) in the initial N characters (each interpreted as
unsigned char) of the object pointed to by S.
@param[in] S Pointer to the object to be searched.
@param[in] C The character value to search for.
@param[in] N Max Number of characters (bytes) to be searched.
@return The memchr function returns a pointer to the located character,
or a null pointer if the character does not occur in the object.
**/
void *memchr(const void *S, int C, size_t N);
/** The strchr function locates the first occurrence of C (converted to a char)
in the string pointed to by S. The terminating null character is considered
to be part of the string.
@param[in] S Pointer to the object to be searched.
@param[in] C The character value to search for.
@return The strchr function returns a pointer to the located character,
or a null pointer if the character does not occur in the string.
**/
char *strchr(const char *S, int C);
/** The strcspn function computes the length of the maximum initial segment of
the string pointed to by S1 which consists entirely of characters NOT from
the string pointed to by S2.
@param[in] S1 Pointer to the object to be searched.
@param[in] S2 Pointer to the list of characters to search for.
@return The strcspn function returns the length of the segment.
**/
size_t strcspn(const char *S1, const char *S2);
/** The strpbrk function locates the first occurrence in the string pointed to
by S1 of any character from the string pointed to by S2.
@param[in] S1 Pointer to the object to be searched.
@param[in] S2 Pointer to the list of characters to search for.
@return The strpbrk function returns a pointer to the character, or a
null pointer if no character from S2 occurs in S1.
**/
char *strpbrk(const char *S1, const char *S2);
/** The strrchr function locates the last occurrence of C (converted to a char)
in the string pointed to by S. The terminating null character is considered
to be part of the string.
@param[in] S Pointer to the object to be searched.
@param[in] C The character value to search for.
@return The strrchr function returns a pointer to the character, or a
null pointer if C does not occur in the string.
**/
char *strrchr(const char *S, int C);
/** The strspn function computes the length of the maximum initial segment of
the string pointed to by S1 which consists entirely of characters from the
string pointed to by S2.
@param[in] S1 Pointer to the object to be searched.
@param[in] S2 Pointer to the list of characters to search for.
@return The strspn function returns the length of the segment.
**/
size_t strspn(const char *S1 , const char *S2);
/** The strstr function locates the first occurrence in the string pointed to
by S1 of the sequence of characters (excluding the terminating null
character) in the string pointed to by S2.
@param[in] S1 Pointer to the object to be searched.
@param[in] S2 Pointer to the sequence of characters to search for.
@return The strstr function returns a pointer to the located string, or a
null pointer if the string is not found. If S2 points to a string
with zero length, the function returns S1.
**/
char *strstr(const char *S1 , const char *S2);
/** Break a string into a sequence of tokens.
A sequence of calls to the strtok function breaks the string pointed to by
S1 into a sequence of tokens, each of which is delimited by a character
from the string pointed to by S2. The first call in the sequence has a
non-null first argument; subsequent calls in the sequence have a null first
argument. The separator string pointed to by S2 may be different from call
to call.
The first call in the sequence searches the string pointed to by S1 for the
first character that is not contained in the current separator string
pointed to by S2. If no such character is found, then there are no tokens
in the string pointed to by S1 and the strtok function returns a null
pointer. If such a character is found, it is the start of the first token.
The strtok function then searches from there for a character that is
contained in the current separator string. If no such character is found,
the current token extends to the end of the string pointed to by S1, and
subsequent searches for a token will return a null pointer. If such a
character is found, it is overwritten by a null character, which terminates
the current token. The strtok function saves a pointer to the following
character, from which the next search for a token will start.
Each subsequent call, with a null pointer as the value of the first
argument, starts searching from the saved pointer and behaves as
described above.
@param[in] S1 Pointer to the string to be tokenized.
@param[in] S2 Pointer to a list of separator characters.
@return The strtok function returns a pointer to the first character of a
token, or a null pointer if there is no token.
**/
char *strtok(char * __restrict S1, const char * __restrict S2);
/* ################ Miscellaneous Functions ########################### */
/** The memset function copies the value of C (converted to an unsigned char)
into each of the first N characters of the object pointed to by S.
@param[out] S Pointer to the first element of the object to be set.
@param[in] C Value to store in each element of S.
@param[in] N Number of elements in S to be set.
@return The memset function returns the value of S.
**/
void *memset(void *S, int C, size_t N);
/** The strerror function maps the number in Num to a message string.
Typically, the values for Num come from errno, but strerror shall map
any value of type int to a message.
@param[in] Num A value to be converted to a message.
@return The strerror function returns a pointer to the string, the
contents of which are locale specific. The array pointed to
must not be modified by the program, but may be overwritten by
a subsequent call to the strerror function.
**/
char *strerror(int Num);
/** The strlen function computes the length of the string pointed to by S.
@param[in] S Pointer to the string to determine the length of.
@return The strlen function returns the number of characters that
precede the terminating null character.
**/
size_t strlen(const char *S);
/* ################ BSD Compatibility Functions ####################### */
char *strdup (const char *);
int strerror_r(int, char *, size_t);
int strcasecmp(const char *s1, const char *s2);
void *memccpy (void *, const void *, int, size_t);
int strncasecmp(const char *s1, const char *s2, size_t n);
size_t strlcpy(char *destination, const char *source, size_t size);
size_t strlcat(char *destination, const char *source, size_t size);
// bcopy is is a void function with the src/dest arguments reversed, being used in socket lib
#define bcopy(a,b,c) ( memcpy((void *)b, (const void *)a, (size_t)c))
// bcmp is same as memcmp, returns 0 for successful compare, non-zero otherwise
#define bcmp(a,b,c) ( memcmp((void *)a, (void *)b, (size_t)c))
/*
* Get next token from string *stringp, where tokens are possibly-empty
* strings separated by characters from delim.
*
* Writes NULs into the string at *stringp to end tokens.
* delim need not remain constant from call to call.
* On return, *stringp points past the last NUL written (if there might
* be further tokens), or is NULL (if there are definitely no more tokens).
*
* If *stringp is NULL, strsep returns NULL.
*/
char *
strsep(
register char **stringp,
register const char *delim
);
__END_DECLS
#endif /* _STRING_H */