Mit Null abschließende Zeichenketten

Siehe auch Breite Null-Terminierte Zeichenketten

Functionen

Zeichenmanipulation

isalnum	prüft, ob das Zeichen alphanumerisch ist
isalpha	prüft, ob das Zeichen alphabetisch ist
iscntrl	prüft, ob das Zeichen ein Kontrollzeichen ist
isdigit	checks if a character is a digit
isgraph	checks if a character is a graphical character
islower	checks if a character is lowercase
isprint	checks if a character is a printing character
ispunct	checks if a character is punctuation
isspace	checks if a character is a space character
isupper	checks if a character is an uppercase character
isxdigit	checks if a character is a hexadecimal character
tolower	converts a character to lowercase
toupper	converts a character to uppercase

Konvertierung in numerische Formate

atof	converts a character string to a double
atoi, atol, atoll	converts a character string to an integer
strtol, strtoll	converts a character string to an integer value
strtoul, strtoull	converts a character string to an unsigned integer value
strtof, strtod, strtold	converts a character string to a floating point value

Zeichenketten verändern

strcpy	copies one string to another
strncpy	copies a certain amount of characters from one string to another
strcat	concatenates two strings
strncat	concatenates a certain amount of characters of two strings
strxfrm	converts a substring so that it can be used by string comparison functions

Zeichenketten untersuchen

strchr	finds the first occurrence of a character in a string
strcmp	compares two strings
strncmp	compares a certain amount of characters of two strings
strcoll	compares two strings in accordance to the current locale
strcspn	searches one string for any characters in another
strlen	returns the length of a given string
strpbrk	finds the first location of any character in one string, in another string
strrchr	finds the last occurrence of a character in a string
strspn	returns the length of a substring of characters of a character string
strstr	finds the first occurrence of a substring of characters
strtok	finds the next token in a character string

Speicher manipulieren

memchr	searches an array for the first occurrence of a character
memcmp	compares two buffers
memset	fills a buffer with a character
memcpy	copies one buffer to another
memmove	moves one buffer to another

Verschiedenes

strerror

returns a text version of a given error code