| atof | 
      converts a string to a double | 
    
    
      | atoi | 
      converts a string to an
      integer | 
    
    
      | atol | 
      converts a string to a long | 
    
    
      | isalnum | 
      true if a character is
      alphanumeric | 
    
    
      | isalpha | 
      true if a character is
      alphabetic | 
    
    
      | iscntrl | 
      true if a character is a control
      character | 
    
    
      | isdigit | 
      true if a character is a digit | 
    
    
      | isgraph | 
      true if a character is a graphical
      character | 
    
    
      | islower | 
      true if a character is
      lowercase | 
    
    
      | isprint | 
      true if a character is a printing
      character | 
    
    
      | ispunct | 
      true if a character is
      punctuation | 
    
    
      | isspace | 
      true if a character is a space
      character | 
    
    
      | isupper | 
      true if a character is an uppercase
      character | 
    
    
      | isxdigit | 
      true if a character is a
      hexidecimal character | 
    
    
      | memchr | 
      searches an array for the first
      occurance of a character | 
    
    
      | memcmp | 
      compares two buffers | 
    
    
      | memcpy | 
      copies one buffer to another | 
    
    
      | memmove | 
      moves one buffer to another | 
    
    
      | memset | 
      fills a buffer with a
      character | 
    
    
      | strcat | 
      concatenates two strings | 
    
    
      | strchr | 
      finds the first occurance of a
      character in a string | 
    
    
      | strcmp | 
      compares two strings | 
    
    
      | strcoll | 
      compares two strings in accordance
      to the current locale | 
    
    
      | strcpy | 
      copies one string to another | 
    
    
      | strcspn | 
      searches one string for any
      characters in another | 
    
    
      | strerror | 
      returns a text version of a given
      error code | 
    
    
      | strlen | 
      returns the length of a given
      string | 
    
    
      | strncat | 
      concatenates a certain amount of
      characters of two strings | 
    
    
      | strncmp | 
      compares a certain amount of
      characters of two strings | 
    
    
      | strncpy | 
      copies a certain amount of
      characters from one string to another | 
    
    
      | strpbrk | 
      finds the first location of any
      character in one string, in another string | 
    
    
      | strrchr | 
      finds the last occurance of a
      character in a string | 
    
    
      | strspn | 
      returns the length of a substring
      of characters of a string | 
    
    
      | strstr | 
      finds the first occurance of a
      substring of characters | 
    
    
      | strtod | 
      converts a string to a double | 
    
    
      | strtok | 
      finds the next token in a
      string | 
    
    
      | strtol | 
      converts a string to a long | 
    
    
      | strtoul | 
      converts a string to an unsigned
      long | 
    
    
      | strxfrm | 
      converts a substring so that it can
      be used by string comparison functions | 
    
    
      | tolower | 
      converts a character to
      lowercase | 
    
    
      | toupper | 
      converts a character to
      uppercase |