| [9] | 1 | /* regsub
|
|---|
| 2 | *
|
|---|
| 3 | * Copyright (c) 1986 by University of Toronto.
|
|---|
| 4 | * Written by Henry Spencer. Not derived from licensed software.
|
|---|
| 5 | *
|
|---|
| 6 | * Permission is granted to anyone to use this software for any
|
|---|
| 7 | * purpose on any computer system, and to redistribute it freely,
|
|---|
| 8 | * subject to the following restrictions:
|
|---|
| 9 | *
|
|---|
| 10 | * 1. The author is not responsible for the consequences of use of
|
|---|
| 11 | * this software, no matter how awful, even if they arise
|
|---|
| 12 | * from defects in it.
|
|---|
| 13 | *
|
|---|
| 14 | * 2. The origin of this software must not be misrepresented, either
|
|---|
| 15 | * by explicit claim or by omission.
|
|---|
| 16 | *
|
|---|
| 17 | * 3. Altered versions must be plainly marked as such, and must not
|
|---|
| 18 | * be misrepresented as being the original software.
|
|---|
| 19 | */
|
|---|
| 20 |
|
|---|
| 21 | #include <string.h>
|
|---|
| 22 | #include <stdio.h>
|
|---|
| 23 | #define const /* avoid "const poisoning" */
|
|---|
| 24 | #include <regexp.h>
|
|---|
| 25 | #undef const
|
|---|
| 26 |
|
|---|
| 27 | /* The first byte of the regexp internal "program" is actually this magic
|
|---|
| 28 | * number; the start node begins in the second byte.
|
|---|
| 29 | */
|
|---|
| 30 | #define MAGIC 0234
|
|---|
| 31 |
|
|---|
| 32 | #define CHARBITS 0377
|
|---|
| 33 | #ifndef CHARBITS
|
|---|
| 34 | #define UCHARAT(p) ((int)*(unsigned char *)(p))
|
|---|
| 35 | #else
|
|---|
| 36 | #define UCHARAT(p) ((int)*(p)&CHARBITS)
|
|---|
| 37 | #endif
|
|---|
| 38 |
|
|---|
| 39 | /*
|
|---|
| 40 | - regsub - perform substitutions after a regexp match
|
|---|
| 41 | */
|
|---|
| 42 | void regsub(prog, source, dest)
|
|---|
| 43 | regexp *prog;
|
|---|
| 44 | char *source;
|
|---|
| 45 | char *dest;
|
|---|
| 46 | {
|
|---|
| 47 | register char *src;
|
|---|
| 48 | register char *dst;
|
|---|
| 49 | register char c;
|
|---|
| 50 | register int no;
|
|---|
| 51 | register int len;
|
|---|
| 52 |
|
|---|
| 53 | if (prog == (regexp *)NULL || source == (char *)NULL || dest == (char *)NULL) {
|
|---|
| 54 | regerror("NULL parm to regsub");
|
|---|
| 55 | return;
|
|---|
| 56 | }
|
|---|
| 57 | if (UCHARAT(prog->program) != MAGIC) {
|
|---|
| 58 | regerror("damaged regexp fed to regsub");
|
|---|
| 59 | return;
|
|---|
| 60 | }
|
|---|
| 61 | src = source;
|
|---|
| 62 | dst = dest;
|
|---|
| 63 | while ((c = *src++) != '\0') {
|
|---|
| 64 | if (c == '&')
|
|---|
| 65 | no = 0;
|
|---|
| 66 | else if (c == '\\' && '0' <= *src && *src <= '9')
|
|---|
| 67 | no = *src++ - '0';
|
|---|
| 68 | else
|
|---|
| 69 | no = -1;
|
|---|
| 70 |
|
|---|
| 71 | if (no < 0) { /* Ordinary character. */
|
|---|
| 72 | if (c == '\\' && (*src == '\\' || *src == '&')) c = *src++;
|
|---|
| 73 | *dst++ = c;
|
|---|
| 74 | } else
|
|---|
| 75 | if (prog->startp[no] != (char *)NULL && prog->endp[no] != (char *)NULL) {
|
|---|
| 76 | len = (int) (prog->endp[no] - prog->startp[no]);
|
|---|
| 77 | strncpy(dst, prog->startp[no], len);
|
|---|
| 78 | dst += len;
|
|---|
| 79 | if (len != 0 && *(dst - 1) == '\0') { /* strncpy hit NUL. */
|
|---|
| 80 | regerror("damaged match string");
|
|---|
| 81 | return;
|
|---|
| 82 | }
|
|---|
| 83 | }
|
|---|
| 84 | }
|
|---|
| 85 | *dst++ = '\0';
|
|---|
| 86 | }
|
|---|
| 87 |
|
|---|
| 88 | /*
|
|---|
| 89 | * $PchId: regsub.c,v 1.3 1995/11/27 20:18:16 philip Exp $
|
|---|
| 90 | */
|
|---|
