C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
strspn, _fstrspn
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <string.h>
 
  Syntax:    size_t strspn( char *string1, char *string2 );
             size_t _fstrspn( char __far *string1, char __far *string2 );
 
  Returns:   an integer value specifying the length of the segment in
             <string1> consisting entirely of characters in <string2>.
 
  See also:  strcspn, strpbrk, strtok, strchr, strrchr, strstr
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