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view lwar/extract.c @ 542:f3018ed5e30e
Fix listing to not rely on undefined memory before the start of instab
This is exactly the same bug that affected symbol value registration and was fixed
in changeset 65c2085e0398. This time, fix it when creating listings.
author | William Astle <lost@l-w.ca> |
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date | Wed, 17 Aug 2022 17:06:30 -0600 |
parents | 45df37e81741 |
children |
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/* extract.c Copyright © 2009 William Astle This file is part of LWAR. LWAR is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "lwar.h" void do_extract(void) { FILE *f; char buf[8]; char *filename; long l; int c; char fnbuf[1024]; int i; FILE *nf; f = fopen(archive_file, "rb"); if (!f) { perror("Opening archive file"); exit(1); } (void)(fread(buf, 1, 6, f) && 1); if (memcmp("LWAR1V", buf, 6)) { fprintf(stderr, "%s is not a valid archive file.\n", archive_file); exit(1); } for (;;) { c = fgetc(f); if (ferror(f)) { perror("Reading archive file"); exit(1); } if (c == EOF) return; // find the end of the file name if (!c) return; i = 0; while (c) { fnbuf[i++] = c; c = fgetc(f); if (c == EOF || ferror(f)) { fprintf(stderr, "Bad archive file\n"); exit(1); } } fnbuf[i] = 0; filename = get_file_name(fnbuf); // get length of archive member l = 0; c = fgetc(f); l = c << 24; c = fgetc(f); l |= c << 16; c = fgetc(f); l |= c << 8; c = fgetc(f); l |= c; for (i = 0; i < nfiles; i++) { if (!strcmp(get_file_name(files[i]), filename)) break; } if (i < nfiles || nfiles == 0) { // extract the file nf = fopen(filename, "wb"); if (!nf) { fprintf(stderr, "Cannot extract '%s': %s\n", filename, strerror(errno)); exit(1); } while (l) { c = fgetc(f); fputc(c, nf); l--; } fclose(nf); } else { // skip the file fseek(f, l, SEEK_CUR); } } }