August 11, 2002 STRCSPN 3

### NAME

strcspn - span the complement of a string

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```size_t` strcspn(```const char *s``, const char *charset`)

### DESCRIPTION

The strcspn(``) function spans the initial part of the nul-terminated string ```s` as long as the characters from ```s` do not occur in string ```charset` (it spans the complement of ```charset`).

### RETURN VALUES

The strcspn(``) function returns the number of characters spanned.

### EXAMPLES

The following call to strcspn(``) will return 3, since the first three characters of string ```s` do not occur in string ```charset`:

  `

      char *s = "foobar";
      char *charset = "bar";
      size_t span;

      span = strcspn(s, charset);

  `

### SEE ALSO

index(3), memchr(3), rindex(3), strchr(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3)

### STANDARDS

The strcspn(``) function conforms to ANSI X3.159-1989 (``ANSI C89'') .