/* $OpenBSD: regsub.c,v 1.3 1996/12/14 07:01:29 tholo Exp $ */ /* * regsub * * Copyright (c) 1986 by University of Toronto. * Written by Henry Spencer. Not derived from licensed software. * * Permission is granted to anyone to use this software for any * purpose on any computer system, and to redistribute it freely, * subject to the following restrictions: * * 1. The author is not responsible for the consequences of use of * this software, no matter how awful, even if they arise * from defects in it. * * 2. The origin of this software must not be misrepresented, either * by explicit claim or by omission. * * 3. Altered versions must be plainly marked as such, and must not * be misrepresented as being the original software. */ #ifndef lint static char *rcsid = "$OpenBSD: regsub.c,v 1.3 1996/12/14 07:01:29 tholo Exp $"; #endif /* not lint */ #include <regexp.h> #include <stdio.h> #include <string.h> #include "regmagic.h" #ifndef CHARBITS #define UCHARAT(p) ((int)*(unsigned char *)(p)) #else #define UCHARAT(p) ((int)*(p)&CHARBITS) #endif /* - regsub - perform substitutions after a regexp match */ void v8_regsub(prog, source, dest) const regexp *prog; const char *source; char *dest; { register const char *src; register size_t len; register char *dst; register char c; register int no; if (prog == NULL || source == NULL || dest == NULL) { v8_regerror("NULL parm to regsub"); return; } if (UCHARAT(prog->program) != MAGIC) { v8_regerror("damaged regexp fed to regsub"); return; } src = source; dst = dest; while ((c = *src++) != '\0') { if (c == '&') no = 0; else if (c == '\\' && '0' <= *src && *src <= '9') no = *src++ - '0'; else no = -1; if (no < 0) { /* Ordinary character. */ if (c == '\\' && (*src == '\\' || *src == '&')) c = *src++; *dst++ = c; } else if (prog->startp[no] != NULL && prog->endp[no] != NULL) { len = prog->endp[no] - prog->startp[no]; (void) strncpy(dst, prog->startp[no], len); dst += len; if (len != 0 && *(dst-1) == '\0') { /* strncpy hit NUL. */ v8_regerror("damaged match string"); return; } } } *dst++ = '\0'; }