/*
 * string
 * This file includes some string functions taken largely from the
 * BDS C Standard Library. Some of the functions have been modified
 * to force compatibilty with the macros in ctype.h.
 * Last Edit 6/6/83
 */

atoi(n)
char *n;
{
	int val; 
	char c;
	int sign;
	val=0;
	sign=1;
	while ((c = *n) == '\t' || c== ' ') ++n;
	if (c== '-') {
		sign = -1;
		n++;
	}
	c = *n;
	while (isdigit(c)) {
		val = val * 10 + c - '0';
		c = *++n;
	}
	return sign*val;
}


char *
strcat(s1,s2)
char *s1, *s2;
{
	char *temp;
	temp=s1;
	while(*s1) s1++;
	do *s1++ = *s2; while (*s2++);
	return temp;
}


strcmp(s,t)
char s[], t[];
{
	int i;
	i = 0;
	while (s[i] == t[i])
		if (s[i++] == '\0')
			return 0;
	return s[i] - t[i];
}


char *
strcpy(s1,s2)
char *s1, *s2;
{
	char *temp;
	temp=s1;
	while (*s1++ = *s2++);
	return temp;
}


strlen(s)
char *s;
{
	int len;
	len=0;
	while (*s++) len++;
	return len;
}
char *
strncpy(s1,s2,n)
char *s1, *s2;
unsigned n;
{
	unsigned count;
	char *ptr;
	ptr = s1;

	for (count = 0; count < n; count++)
		*s1++ = *s2++;
	return ptr;
}