mapper.c 小工具
2017年08月27日
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- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <sys/mman.h>
- #include <errno.h>
- #include <limits.h>
-
- int main(int argc, char **argv)
- {
- char *fname;
- FILE *f;
- unsigned long offset, len;
- void *address;
-
- if (argc !=4
- || sscanf(argv[2],"%li", &offset) != 1
- || sscanf(argv[3],"%li", &len) != 1) {
- fprintf(stderr, "%s: Usage \"%s <file> <offset> <len>\"\n", argv[0],
- argv[0]);
- exit(1);
- }
-
- if (offset == INT_MAX) {
- if (argv[2][1]=='x')
- sscanf(argv[2]+2, "%lx", &offset);
- else
- sscanf(argv[2], "%lu", &offset);
- }
-
- fname=argv[1];
-
- if (!(f=fopen(fname,"r"))) {
- fprintf(stderr, "%s: %s: %s\n", argv[0], fname, strerror(errno));
- exit(1);
- }
-
- address=mmap(0, len, PROT_READ, MAP_FILE | MAP_PRIVATE, fileno(f), offset);
-
- if (address == (void *)-1) {
- fprintf(stderr,"%s: mmap(): %s\n",argv[0],strerror(errno));
- exit(1);
- }
- fclose(f);
- fprintf(stderr, "mapped \"%s\" from %lu (0x%08lx) to %lu (0x%08lx)\n",
- fname, offset, offset, offset+len, offset+len);
-
- fwrite(address, 1, len, stdout);
- pause();
- return 0;
- }