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Annotation of researchv10no/cmd/worm/scsi/tcl/strspn.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * strspn.c --
        !             3:  *
        !             4:  *     Source code for the "strspn" library routine.
        !             5:  *
        !             6:  * Copyright 1988 Regents of the University of California
        !             7:  * Permission to use, copy, modify, and distribute this
        !             8:  * software and its documentation for any purpose and without
        !             9:  * fee is hereby granted, provided that the above copyright
        !            10:  * notice appear in all copies.  The University of California
        !            11:  * makes no representations about the suitability of this
        !            12:  * software for any purpose.  It is provided "as is" without
        !            13:  * express or implied warranty.
        !            14:  */
        !            15: 
        !            16: #ifndef lint
        !            17: static char rcsid[] = "$Header: /sprite/src/lib/c/string/RCS/strspn.c,v 1.2 89/03/22 16:07:53 rab Exp $ SPRITE (Berkeley)";
        !            18: #endif /* not lint */
        !            19: 
        !            20: #include <string.h>
        !            21: 
        !            22: /*
        !            23:  *----------------------------------------------------------------------
        !            24:  *
        !            25:  * strspn --
        !            26:  *
        !            27:  *     Compute the length of the maximum initial segment of "string"
        !            28:  *     whose characters all are in "chars".
        !            29:  *
        !            30:  * Results:
        !            31:  *     The return value is the length of the initial segment (0 if the
        !            32:  *     first character isn't in "chars".
        !            33:  *
        !            34:  * Side effects:
        !            35:  *     None.
        !            36:  *
        !            37:  *----------------------------------------------------------------------
        !            38:  */
        !            39: 
        !            40: int
        !            41: strspn(string, chars)
        !            42:     char *string;                      /* String to search. */
        !            43:     char *chars;                       /* Characters to look for in string. */
        !            44: {
        !            45:     register char c, *p, *s;
        !            46: 
        !            47:     for (s = string, c = *s; c != 0; s++, c = *s) {
        !            48:        for (p = chars; *p != 0; p++) {
        !            49:            if (c == *p) {
        !            50:                goto next;
        !            51:            }
        !            52:        }
        !            53:        break;
        !            54:        next: ;
        !            55:     }
        !            56:     return s-string;
        !            57: }

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