strcspn - span the complement of a string

CONTENTS

Library
Synopsis
Description
Return Values
See Also
Standards

.Lb libc

.In string.h size_t strcspn const char *s const char *charset

The strcspn function spans the initial part of the null-terminated string s as long as the characters from s do not occur in string charset (it spans the complement of charset). In other words, it computes the string array index in s of the first character of s which is also in charset, else the index of the first null character.

The strcspn function returns the number of characters spanned.

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

The strcspn function conforms to -isoC.

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