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atlast.c
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C/C++ Source or Header
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1990-10-21
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34 lines
/*********
* Atlast.c by Leonard Zerman
* Placed in the public domain by Tom Rettig Associates, 10/22/1990.
*
* Syntax: ATLAST( <expC>, <expC> )
* Return: The last position of a character found in a string.
* Note : Returns 0 if not found, -1 if error.
********/
#include "trlib.h"
TRTYPE atlast() /* declare the atlast function */
{
char *instr; /* a pointer to the passed string */
char *c; /* a pointer to the char to be found */
int i;
if (PCOUNT ==2 && ISCHAR(1) && ISCHAR(2))
{
c = _parc(1);
instr = _parc(2); /* assign the address to instr */
}
else
{
_retni(ERRORNEG); /* return a syntax error */
return; /* return from program */
}
for (i = _tr_strlen(instr); instr[i] != *c && i >= 0 ; i--)
; /* empty loop checking for condition */
_retni( ++i );
}