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view lwar/replace.c @ 234:d389adbcc4ab
Added section base and length symbols to lwlink
Added the ability for a link script to define section base and section
length symbols when linking. These symbols are searched for when an external
reference is resolved before looking up any symbols in the various objects
being linked. Also documented the new link script directives and added such
directives to all default link scripts.
author | William Astle <lost@l-w.ca> |
---|---|
date | Fri, 10 Aug 2012 23:47:56 -0600 |
parents | 7317fbe024af |
children | 346966cffeef |
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/* replace.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 <unistd.h> #include "lwar.h" void do_replace(void) { FILE *f; FILE *nf; unsigned char buf[8]; long l; int c; FILE *f2; int i; char fnbuf[1024]; char fnbuf2[1024]; sprintf(fnbuf, "%s.tmp", archive_file); f = fopen(archive_file, "r+"); if (!f) { if (errno == ENOENT) { nf = fopen(fnbuf, "w"); if (nf) { fputs("LWAR1V", nf); goto doadd; } } perror("Cannot open archive file"); } fread(buf, 1, 6, f); if (memcmp("LWAR1V", buf, 6)) { fprintf(stderr, "%s is not a valid archive file.\n", archive_file); exit(1); } nf = fopen(fnbuf, "w"); if (!nf) { perror("Cannot create temp archive file"); exit(1); } fputs("LWAR1V", nf); for (;;) { c = fgetc(f); if (c == EOF && ferror(f)) { perror("Reading archive file"); exit(1); } if (c == EOF) goto doadd; if (!c) { goto doadd; } // find the end of the file name i = 0; while (c) { fnbuf2[i++] = c; c = fgetc(f); if (c == EOF || ferror(f)) { fprintf(stderr, "Bad archive file\n"); exit(1); } } fnbuf2[i] = 0; // 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; // is it a file we are replacing? if so, do not copy it for (i = 0; i < nfiles; i++) { if (!strcmp(files[i], fnbuf2)) break; } if (i < nfiles) { fseek(f, l, SEEK_CUR); } else { // otherwise, copy it fprintf(nf, "%s", fnbuf2); fputc(0, nf); fputc(l >> 24, nf); fputc((l >> 16) & 0xff, nf); fputc((l >> 8) & 0xff, nf); fputc(l & 0xff, nf); while (l) { c = fgetc(f); fputc(c, nf); l--; } } } // done with the original file fclose(f); doadd: for (i = 0; i < nfiles; i++) { f2 = fopen(files[i], "r"); if (!f2) { fprintf(stderr, "Cannot open file %s:", files[i]); perror(""); exit(1); } fread(buf, 1, 6, f2); if (mergeflag && !memcmp("LWAR1V", buf, 6)) { // add archive contents... for (;;) { c = fgetc(f2); if (c == EOF || ferror(f2)) { perror("Reading input archive file"); exit(1); } if (c == EOF) break; if (!c) { break; } // find the end of the file name while (c) { fputc(c, nf); c = fgetc(f2); if (c == EOF || ferror(f)) { fprintf(stderr, "Bad input archive file\n"); exit(1); } } fputc(0, nf); // get length of archive member l = 0; c = fgetc(f2); fputc(c, nf); l = c << 24; c = fgetc(f2); fputc(c, nf); l |= c << 16; c = fgetc(f2); fputc(c, nf); l |= c << 8; c = fgetc(f2); fputc(c, nf); l |= c; while (l) { c = fgetc(f2); fputc(c, nf); l--; } } fclose(f2); continue; } fseek(f2, 0, SEEK_END); l = ftell(f2); fseek(f2, 0, SEEK_SET); fputs(files[i], nf); fputc(0, nf); fputc(l >> 24, nf); fputc((l >> 16) & 0xff, nf); fputc((l >> 8) & 0xff, nf); fputc(l & 0xff, nf); while (l) { c = fgetc(f2); fputc(c, nf); l--; } } // flag end of file fputc(0, nf); fclose(nf); if (rename(fnbuf, archive_file) < 0) { perror("Cannot replace old archive file"); unlink(fnbuf); } }