xref: /minix3/minix/lib/libminc/atoi.c (revision 433d6423c39e34ec4b79c950597bb2d236f886be) 
1 /* Extracted from sys/arch/i386/stand/lib/bootmenu.c */
2 int atoi(const char *);
3 
4 #define isnum(c) ((c) >= '0' && (c) <= '9')
5 
6 int
atoi(const char * in)7 atoi(const char *in)
8 {
9 	const char *c;
10 	int ret;
11 
12 	ret = 0;
13 	c = in;
14 	if (*c == '-')
15 		c++;
16 	for (; isnum(*c); c++)
17 		ret = (ret * 10) + (*c - '0');
18 
19 	return (*in == '-') ? -ret : ret;
20 }
21 
22