ack/lang/cem/libcc.ansi/core/string/strcmp.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

24 lines
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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 <string.h>
int strcmp(register const char* s1, register const char* s2)
{
while (*s1 == *s2++)
{
if (*s1++ == '\0')
{
return 0;
}
}
if (*s1 == '\0')
return -1;
if (*--s2 == '\0')
return 1;
return (unsigned char)*s1 - (unsigned char)*s2;
}