AT&T UNIX™PC Unix System V Users Manual - tenox

STRING (3C) STRING (3C)
NOTE
BUGS
Strcpy copies string 82 to 81 , stopping after the null character has
been copied. Strncpy copies exactly n characters, truncating 82
or adding null characters to 81 if necessary. The result will not be
null-terminated if the length of 82 is n or more. Each function
returns 81 .
Strlen returns the number of characters in 8, not including the
terminating null character.
Strchr ( 8trrchr) returns a pointer to the first (last) occurrence of
character c in string 8, or a NULL pointer if c does not occur in
the string. The null character terminating a string is considered
to be part of the string.
Strpbrk returns a pointer to the first occurrence in string 81 of
any character from string 82, or a NULL pointer if no character
from 82 exists in 81 .
Str8pn ( 8trc8pn) returns the length of the initial segment of string
81 which consists entirely of characters from (not from) string 82.
Strtok considers the string 81 to consist of a sequence of zero or
more text tokens separated by spans of one or more characters
from the separator string 82. The first call (with pointer 81
specified) returns a pointer to the first character of the first token,
and will have written a null character into 81 immediately following
the returned token. The function keeps track of its position in
the string between separate calls, so that on subsequent calls
(which must be made with the first argument a NULL pointer) will l
work through the string 81 immediately following that token. In
this way subsequent calls will work through the string 81 until no
tokens remain. The separator string 82 may be different from call
to call. When no token remains in 81, a NULL pointer is returned.
For user convenience, all these functions are declared in the
optional header file.
Strcmp and 8trncmp use native character comparison, which is
signed on PDP- lis, unsigned on other machines.
Character movement is performed differently in different implementations.
Thus overlapping moves may yield surprises.
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