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STRTRUNC.C
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1986-09-15
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/**
* name StrTrunc -- truncate a string based on a set of trailing chars
*
* synopsis str = StrTrunc(str, sub);
*
* char *str, original string being truncated
* *sub; truncation-character string
*
* description Removes each trailing character in "str" that is in "sub".
* The string length is shortened by replacement with a null char.
*
* logic Obvious.
*
* returns str = original string.
*
* modifies External "CharASCII", temporarily.
*
* cautions "str" and "sub" must be valid pointers.
*
* examples Obvious.
**/
#ifndef LINT_ARGS
#define LINT_ARGS
#endif
// #include <ffc/const.h>
// #include <ffc/string.h>
/***/
extern char *StrTrunc(str, sub)
char *str,
*sub;
{
register unsigned char *s;
/*
* set up CharASCII
*/
s = (unsigned char *)sub;
while (*s)
CharASCII[*s++] = Null;
/*
* truncate
*/
s = (unsigned char *)str;
while (*s)
s++;
while (!(*s = CharASCII[*s]) && s-- > str)
;
/*
* re-set CharASCII
*/
s = (unsigned char *)sub;
while (CharASCII[*s] = *s)
s++;
return (str);
}