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128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/*
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* bp.c --
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*
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* This file contains the "bp" ("binary patch") program. It is used
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* to replace configuration strings in Tcl/Tk binaries as part of
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* installation.
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*
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* Usage: bp file search replace
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*
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* This program searches file bp for the first occurrence of the
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* character string given by "search". If it is found, then the
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* first characters of that string get replaced by the string
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* given by "replace". The replacement string is NULL-terminated.
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*
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* Copyright (c) 1996 Sun Microsystems, Inc.
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* All rights reserved.
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* This file is NOT subject to the terms described in "license.terms".
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*
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* SCCS: @(#) bp.c 1.2 96/03/12 09:08:26
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*/
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#include <stdio.h>
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#include <string.h>
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extern int errno;
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/*
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* The array below saves the last few bytes read from the file, so that
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* they can be compared against a particular string that we're looking
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* for.
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*/
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#define BUFFER_SIZE 200
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char buffer[BUFFER_SIZE];
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int
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main(argc, argv)
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int argc; /* Number of command-line arguments. */
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char **argv; /* Values of command-line arguments. */
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{
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int length, matchChar, fileChar, cur, fileIndex, stringIndex;
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char *s;
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FILE *f;
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if (argc != 4) {
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fprintf(stderr,
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"Wrong # args: should be \"%s fileName string replace\"\n",
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argv[0]);
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exit(1);
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}
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f = fopen(argv[1], "r+");
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if (f == NULL) {
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fprintf(stderr,
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"Couldn't open \"%s\" for writing: %s\n",
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argv[1], strerror(errno));
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exit(1);
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}
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for (cur = 0; cur < BUFFER_SIZE; cur++) {
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buffer[cur] = 0;
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}
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s = argv[2];
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length = strlen(s);
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if (length > BUFFER_SIZE) {
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fprintf(stderr,
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"String \"%s\" too long; must be %d or fewer chars.\n",
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s, BUFFER_SIZE);
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exit(1);
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}
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matchChar = s[length-1];
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while (1) {
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fileChar = getc(f);
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if (fileChar == EOF) {
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if (ferror(f)) {
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goto ioError;
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}
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fprintf(stderr, "Couldn't find string \"%s\"\n", argv[2]);
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exit(1);
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}
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buffer[cur] = fileChar;
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if (fileChar == matchChar) {
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/*
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* Last character of the string matches the current character
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* from the file. Search backwards through the buffer to
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* see if the preceding characters from the file match the
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* characters from the string.
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*/
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for (fileIndex = cur-1, stringIndex = length-2;
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stringIndex >= 0; fileIndex--, stringIndex--) {
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if (fileIndex < 0) {
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fileIndex = BUFFER_SIZE-1;
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}
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if (buffer[fileIndex] != s[stringIndex]) {
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goto noMatch;
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}
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}
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/*
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* Matched! Backup to the start of the string, then
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* overwrite it with the replacement value.
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*/
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if (fseek(f, -length, SEEK_CUR) == -1) {
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goto ioError;
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}
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if (fwrite(argv[3], strlen(argv[3])+1, 1, f) == 0) {
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goto ioError;
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}
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exit(0);
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}
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/*
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* No match; go on to next character of file.
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*/
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noMatch:
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cur++;
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if (cur >= BUFFER_SIZE) {
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cur = 0;
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}
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}
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ioError:
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fprintf(stderr, "I/O error: %s\n", strerror(errno));
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exit(1);
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}
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