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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