1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 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 * in place replace of first occurrence of /match/ with /replace/ in path 28 * end of path returned 29 */ 30 31 #include <ast.h> 32 33 char* 34 pathrepl(register char* path, const char* match, register const char* replace) 35 { 36 register const char* m = match; 37 register const char* r; 38 char* t; 39 40 if (!match) match = ""; 41 if (!replace) replace = ""; 42 if (streq(match, replace)) 43 return(path + strlen(path)); 44 for (;;) 45 { 46 while (*path && *path++ != '/'); 47 if (!*path) break; 48 if (*path == *m) 49 { 50 t = path; 51 while (*m && *m++ == *path) path++; 52 if (!*m && *path == '/') 53 { 54 register char* p; 55 56 p = t; 57 r = replace; 58 while (p < path && *r) *p++ = *r++; 59 if (p < path) while (*p++ = *path++); 60 else if (*r && p >= path) 61 { 62 register char* u; 63 64 t = path + strlen(path); 65 u = t + strlen(r); 66 while (t >= path) *u-- = *t--; 67 while (*r) *p++ = *r++; 68 } 69 else p += strlen(p) + 1; 70 return(p - 1); 71 } 72 path = t; 73 m = match; 74 } 75 } 76 return(path); 77 } 78