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Friedrich-Alexander-Universität Lehrstuhl für Informatik 4 (Systemsoftware)
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  1. Friedrich-Alexander-Universität
  2. Technische Fakultät
  3. Department Informatik
Friedrich-Alexander-Universität Lehrstuhl für Informatik 4 (Systemsoftware)
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              Dokumentation

              Functions
              String function

              String functions as provided by string.h in the C standard library. More...

              Functions

              char * strchrnul (const char *s, int c)
               Find the first occurrence of a character in a string. More...
               
              char * strchr (const char *s, int c)
               Find the first occurrence of a character in a string. More...
               
              int strcmp (const char *s1, const char *s2)
               Compare two strings. More...
               
              int strncmp (const char *s1, const char *s2, size_t n)
               Compare two strings. More...
               
              size_t strlen (const char *s)
               Calculate the length of a string. More...
               
              size_t strnlen (const char *s, size_t maxlen)
               Calculate the length of a string, limited by maxlen. More...
               
              char * strcpy (char *dest, const char *src)
               Copy the contents of a string including the terminating null byte (\0) More...
               
              char * strncpy (char *dest, const char *src, size_t n)
               Copy the contents of a string up to a maximum length or the terminating null byte (\0), whatever comes first. More...
               
              char * strdup (const char *s)
               Duplicate a string. More...
               
              char * strndup (const char *s, size_t n)
               Duplicate a string. More...
               
              void * memcpy (void *__restrict__ dest, void const *__restrict__ src, size_t size)
               Copy a memory area. More...
               
              void * memmove (void *dest, void const *src, size_t size)
               Copy a memory area while the source may overlap with the destination. More...
               
              void * memset (void *dest, int pattern, size_t size)
               Fill a memory area with a pattern. More...
               
              int memcmp (const void *s1, const void *s2, size_t n)
               Compare a memory area. More...
               

              Detailed Description

              String functions as provided by string.h in the C standard library.

              Function Documentation

              char* strchrnul ( const char *  s,
              int  c 
              )

              Find the first occurrence of a character in a string.

              Parameters
              sstring to
              ccharacter to find
              Returns
              Pointer to first occurrence of the character or to null byte at the end of the string if not found
              char* strchr ( const char *  s,
              int  c 
              )

              Find the first occurrence of a character in a string.

              Parameters
              sstring to
              ccharacter to find
              Returns
              Pointer to first occurrence of the character or to nullptr if not found
              int strcmp ( const char *  s1,
              const char *  s2 
              )

              Compare two strings.

              Parameters
              s1first string
              s2second string
              Returns
              an integer less than, equal to, or greater than zero if first string is found, respectively, to be less than, to match, or be greater than second string
              int strncmp ( const char *  s1,
              const char *  s2,
              size_t  n 
              )

              Compare two strings.

              Parameters
              s1first string
              s2second string
              nnumber of bytes to compare
              Returns
              an integer less than, equal to, or greater than zero if the given number of bytes of the first string are found, respectively, to be less than, to match, or be greater than second string
              size_t strlen ( const char *  s)

              Calculate the length of a string.

              Parameters
              spointer to a string
              Returns
              number of bytes in the string
              size_t strnlen ( const char *  s,
              size_t  maxlen 
              )

              Calculate the length of a string, limited by maxlen.

              Parameters
              spointer to a string
              maxlenupper limit of length to be returned
              Returns
              number of bytes in the string, or maxlen – whichever is smaller
              char* strcpy ( char *  dest,
              const char *  src 
              )

              Copy the contents of a string including the terminating null byte (\0)

              Parameters
              destdestination string buffer
              srcsource string buffer
              Returns
              a pointer to the destination string buffer
              Note
              Beware of buffer overruns!
              char* strncpy ( char *  dest,
              const char *  src,
              size_t  n 
              )

              Copy the contents of a string up to a maximum length or the terminating null byte (\0), whatever comes first.

              Parameters
              destdestination string buffer
              srcsource string buffer
              nmaximum number of bytes to copy
              Returns
              a pointer to the destination string buffer
              Note
              If there is no null byte (\0) among the first n bytes, the destination will not be null-terminated!
              char* strdup ( const char *  s)

              Duplicate a string.

              Parameters
              spointer to a string
              Returns
              pointer to a duplicated string allocated with malloc or nullptr if allocation failed.
              char* strndup ( const char *  s,
              size_t  n 
              )

              Duplicate a string.

              Parameters
              spointer to a string
              nmaximum length
              Returns
              pointer to a duplicated string (up to maximum length, always null-terminated), allocated with malloc or nullptr if allocation failed.
              void* memcpy ( void *__restrict__  dest,
              void const *__restrict__  src,
              size_t  size 
              )

              Copy a memory area.

              Parameters
              destdestination buffer
              srcsource buffer
              sizenumber of bytes to copy
              Returns
              pointer to destination
              Note
              The memory must not overlap!
              void* memmove ( void *  dest,
              void const *  src,
              size_t  size 
              )

              Copy a memory area while the source may overlap with the destination.

              Parameters
              destdestination buffer
              srcsource buffer
              sizenumber of bytes to copy
              Returns
              pointer to destination
              void* memset ( void *  dest,
              int  pattern,
              size_t  size 
              )

              Fill a memory area with a pattern.

              Parameters
              destdestination buffer
              patternsingle byte pattern
              sizenumber of bytes to fill with pattern
              Returns
              pointer to destination
              int memcmp ( const void *  s1,
              const void *  s2,
              size_t  n 
              )

              Compare a memory area.

              Parameters
              s1first memory buffer
              s2second memory buffer
              nnumber of bytes to compare
              Returns
              an integer less than, equal to, or greater than zero if the first n bytes of s1 is found, respectively, to be less than, to match, or be greater than the first n bytes of s2.
              Friedrich-Alexander-Universität
              Erlangen-Nürnberg

              Schlossplatz 4
              91054 Erlangen
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