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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [tools/] [build/] [binpatch.c] - Rev 833
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/* * $Id: binpatch.c,v 1.2 2001-09-27 12:02:53 chris Exp $ */ #include <stdio.h> #include <stdlib.h> /* * This function will patch binary file */ static char buf[512]; static void usage(void) { printf("usage: binpatch [-h] <ofile> <ifile> <reloc> <off> <byte0> " "[<byte1> [<byte2> [<byte3>]]]\n"); printf("this function patches binary file at specified offset with\n"); printf("up to 4 bytes provided on command line \n"); printf("-h - prints this message\n\n"); printf("<ofile> - output file\n"); printf("<ifile> - input ifile\n"); printf("<reloc> - relocation address of image\n"); printf("<off> - offset of patch, offset in file is at off - reloc\n"); printf("<byte0> - byte 0 of patch\n"); printf("<byte1> - byte 1 of patch\n"); printf("<byte2> - byte 1 of patch\n"); printf("<byte3> - byte 1 of patch\n"); return; } int main(int argc, char **argv) { int c; FILE *ofp, *ifp; char patch[4], *end; int patchLen, tmp, i, off, cnt, patched, len, reloc; /* parse command line options */ while ((c = getopt(argc, argv, "h")) >= 0) { switch (c) { case 'h': usage(); return 0; default: usage(); return 1; } } if(argc < 6) { usage(); return 1; } /* Let us get offset in file */ reloc = strtol(argv[3], &end, 0); if(end == argv[3] || off < 0) { fprintf(stderr, "bad reloc value %s\n", argv[3]); return 1; } off = strtol(argv[4], &end, 0); if(end == argv[4] || off < 0 || off < reloc) { fprintf(stderr, "bad offset value %s\n", argv[4]); return 1; } off -= reloc; /* Let us get patch */ patchLen = argc - 5; for(i=0; i<patchLen; i++) { tmp = strtol(argv[5+i], &end, 0); if(end == argv[4+i] || tmp < 0 || tmp > 0xff) { fprintf(stderr, "bad byte value %s\n", argv[5+i]); return 1; } patch[i] = tmp; } ifp = fopen(argv[2], "r"); if(ifp == NULL) { fprintf(stderr, "unable to open file %s\n", argv[2]); return 1; } ofp = fopen(argv[1], "w"); if(ofp == NULL) { fprintf(stderr, "unable to open file %s\n", argv[1]); return 1; } cnt = 0; patched = 0; for(;;) { len = fread(buf, 1, sizeof(buf), ifp); if(len == 0) { break; } if(cnt <= off && (cnt + len) > off) { /* Perform patch */ for(i=0; i<patchLen && (off+i)<(cnt+len); i++) { buf[off-cnt+i] = patch[i]; } patched = 1; } else if(cnt > off && cnt < (off + patchLen)) { /* Perform patch */ for(i=cnt-off; i<patchLen; i++) { buf[off-cnt+i] = patch[i]; } patched = 1; } fwrite(buf, 1, len, ofp); cnt += len; } fclose(ifp); fclose(ofp); if(!patched) { fprintf(stderr, "warning: offset is beyond input file length\n"); fprintf(stderr, " no patch is performed\n"); } return 0; }
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