1 /* 2 * Copyright (c) 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)atoi.c 5.3 (Berkeley) 07/19/88"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <ctype.h> 23 24 atoi(ascii) 25 register char *ascii; 26 { 27 register int val; 28 int negative = 0; 29 30 for (; isascii(*ascii) && isspace(*ascii); ++ascii); 31 if (*ascii == '+') 32 ++ascii; 33 else if (*ascii == '-') { 34 ++ascii; 35 negative = 1; 36 } 37 for (val = 0; isascii(*ascii) && isdigit(*ascii); ++ascii) 38 val = val * 10 + *ascii - '0'; 39 return(negative ? -val : val); 40 } 41