1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2009 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 #include <ast.h> 25 #include <ctype.h> 26 27 /* 28 * version strncmp(3) 29 */ 30 31 int 32 strnvcmp(register const char* a, register const char* b, size_t n) 33 { 34 register const char* ae; 35 register const char* be; 36 register unsigned long na; 37 register unsigned long nb; 38 39 ae = a + n; 40 be = b + n; 41 for (;;) 42 { 43 if (a >= ae) 44 { 45 if (b >= be) 46 return 0; 47 return 1; 48 } 49 else if (b >= be) 50 return -1; 51 if (isdigit(*a) && isdigit(*b)) 52 { 53 na = nb = 0; 54 while (a < ae && isdigit(*a)) 55 na = na * 10 + *a++ - '0'; 56 while (b < be && isdigit(*b)) 57 nb = nb * 10 + *b++ - '0'; 58 if (na < nb) 59 return -1; 60 if (na > nb) 61 return 1; 62 } 63 else if (*a != *b) 64 break; 65 else if (!*a) 66 return 0; 67 else 68 { 69 a++; 70 b++; 71 } 72 } 73 if (*a == 0) 74 return -1; 75 if (*b == 0) 76 return 1; 77 if (*a == '.') 78 return -1; 79 if (*b == '.') 80 return 1; 81 if (*a == '-') 82 return -1; 83 if (*b == '-') 84 return 1; 85 return *a < *b ? -1 : 1; 86 } 87