ack/lang/cem/libcc.ansi/core/stdlib/atoi.c
David Given d1cdb07719 Realise that the libc core can safely call other libc core functions, even if
they're not defined in the core: so putw() can call stdio stuff, for example.
So the earlier concept of pureness isn't necessary. Rename accordingly.
2018-06-21 23:24:23 +02:00

33 lines
579 B
C

/*
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
* See the copyright notice in the ACK home directory, in the file "Copyright".
*/
/* $Id$ */
#include <ctype.h>
/* We do not use strtol here for backwards compatibility in behaviour on
overflow.
*/
int atoi(register const char* nptr)
{
int total = 0;
int minus = 0;
while (isspace(*nptr))
nptr++;
if (*nptr == '+')
nptr++;
else if (*nptr == '-')
{
minus = 1;
nptr++;
}
while (isdigit(*nptr))
{
total *= 10;
total += (*nptr++ - '0');
}
return minus ? -total : total;
}