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/*
\fucref{fun\_str\_el}{void fun\_str\_el ()}
{}
{}
{}
{}
{funstrel.c}
{
This function is called when an {\em op\_str\_el} opcode is enountered.
The last pushed value is interpreted as a string, the one but last
pushed value as an index.
The return register {\em reg} is set to an {\em e\_str} variable:
the character from the string at index {\em index}, terminated by
$\backslash$0. If index is smaller than 0 or larger than the size of
the string, {\em reg} holds a null-character.
}
*/
#include "icm-exec.h"
void fun_str_el ()
{
register int
index;
register char
*str;
char
buf [2];
reg = newvar (e_str);
buf [1] = '\0';
index = (unsigned) stack [sp].vu.intval;
str = stack [sp - 1].vu.i->ls.str;
if (index < 0 || index >= (int) strlen (str))
buf [0] = '\0';
else
buf [0] = str [index];
reg.vu.i->ls.str = xstrdup (buf);
}
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