pathrepl.c revision 3e14f97f673e8a630f076077de35afdd43dc1587
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/***********************************************************************
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* This software is part of the ast package *
3e14f97f673e8a630f076077de35afdd43dc1587Roger A. Faulkner* Copyright (c) 1985-2010 AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* and is licensed under the *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Common Public License, Version 1.0 *
7c2fbfb345896881c631598ee3852ce9ce33fb07April Chin* by AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* A copy of the License is available at *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Information and Software Systems Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* AT&T Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Florham Park NJ *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Glenn Fowler <gsf@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* David Korn <dgk@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Phong Vo <kpv@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin***********************************************************************/
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * Glenn Fowler
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * AT&T Bell Laboratories
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * in place replace of first occurrence of /match/ with /replace/ in path
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * end of path returned
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinpathrepl(register char* path, const char* match, register const char* replace)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register const char* m = match;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register const char* r;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (!*path) break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (*path == *m)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register char* p;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin while (p < path && *r) *p++ = *r++;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin else if (*r && p >= path)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register char* u;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin u = t + strlen(r);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin while (t >= path) *u-- = *t--;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin while (*r) *p++ = *r++;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return(p - 1);