BSD 3 development

[unix-history] / usr / src / cmd / sh / string.c

#
/*
* UNIX shell
*
* S. R. Bourne
* Bell Telephone Laboratories
*
*/

#include        "defs.h"


/* ========     general purpose string handling ======== */


STRING  movstr(a,b)
       REG STRING      a, b;
{
       WHILE *b++ = *a++ DONE
       return(--b);
}

INT     any(c,s)
       REG CHAR        c;
       STRING          s;
{
       REG CHAR d;

       WHILE d = *s++
       DO      IF d==c
               THEN    return(TRUE);
               FI
       OD
       return(FALSE);
}

INT     cf(s1, s2)
       REG STRING s1, s2;
{
       WHILE *s1++ == *s2
       DO      IF *s2++==0
               THEN    return(0);
               FI
       OD
       return(*--s1 - *s2);
}

INT     length(as)
       STRING as;
{
       REG STRING s;

       IF s=as THEN WHILE *s++ DONE FI
       return(s-as);
}