1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2008 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #pragma prototyped 23 /* 24 * Glenn Fowler 25 * AT&T Bell Laboratories 26 * 27 * convert a 0 terminated character constant string to an int 28 */ 29 30 #include <ast.h> 31 32 int 33 chrtoi(register const char* s) 34 { 35 register int c; 36 register int n; 37 register int x; 38 char* p; 39 40 c = 0; 41 for (n = 0; n < sizeof(int) * CHAR_BIT; n += CHAR_BIT) 42 { 43 switch (x = *((unsigned char*)s++)) 44 { 45 case '\\': 46 x = chresc(s - 1, &p); 47 s = (const char*)p; 48 break; 49 case 0: 50 return(c); 51 } 52 c = (c << CHAR_BIT) | x; 53 } 54 return(c); 55 } 56