Added `--help` option

Fortune for naka's current commit: Small curse − 小凶
master
Avril 3 years ago
parent f3538aa2db
commit f056d09c2e
Signed by: flanchan
GPG Key ID: 284488987C31F630

@ -38,6 +38,7 @@ typedef union memory_map {
} map_t;
map_result_t map_fd(int fd, bool write, usize size, off_t offset, map_t *pOUT map);
/// Specify size as 0 to use the file's full size for the map.
map_result_t map_file(const char* file, bool write, usize size, off_t offset, map_t *pOUT map);
map_result_t map_anon(void* ptr, usize len, map_t *pOUT map);
map_result_t map_free(map_t map);

@ -24,4 +24,18 @@
/// Compiled time (UTC unix timestamp)
#define PROG_COMPILED_TIMESTAMP AS(_PROJECT_COMPILED, u64)
// Returns from the program
// Invalid arguments to program (print usage to stderr)
#define PROG_RET_ARGS 1
// Mapping of argv[1] failed
#define PROG_RET_MAP_NEEDLE_FAILED 2
// `h` is the number in argv[] of the haystack file
#define PROG_RET_MAP_HAYSTACK_N_FAILED(h) ((h) << 2)
// `h` is the number in argv[] of the haystack file
#define PROG_RET_UNMAP_HAYSTACK_N_FAILED(h) (((h) << 2) | 1)
// Unmapping of argv[1] failed
#define PROG_RET_UNMAP_NEEDLE_FAILED 3
#endif /* _PROJECT_H */

@ -33,6 +33,7 @@ void usage(FILE* out, int argc, char** argv)
prog_info(out);
fprintf(out, "\nUsage: %s <needle> <haystack(s)...>\n", argv[0] ?: PROG_NAME);
fprintf(out, "\nUsage: %s --help\n", argv[0] ?: PROG_NAME);
}
// err: 0 for normal exit and print to stdout.
@ -43,20 +44,27 @@ noreturn void usage_then_exit(int err, int argc, char** argv)
exit(err);
}
int main(int argc, char** argv)
{
TRACE("main start with %d (pn: %s, a1: %s)", argc, argv[0], argv[1] ?: "<null>");
if(!argv[1] || !argv[2]) usage_then_exit(1, argc, argv);
if(!argv[1])
inv_args:
usage_then_exit(PROG_RET_ARGS, argc, argv);
else if(strcmp(argv[1], "--help")==0)
usage_then_exit(0, argc, argv);
else if(!argv[2])
goto inv_args;
map_t needle;
INFO("Mapping needle file `%s'", argv[1]);
if(!map_handle_err(map_file(argv[1], false, 0, 0, &needle))) return 2;
if(!map_handle_err(map_file(argv[1], false, 0, 0, &needle))) return PROG_RET_MAP_NEEDLE_FAILED;
if(!map_handle_err(map_free(needle))) return 3;
TRACE("main end");
if(!map_handle_err(map_free(needle))) return PROG_RET_UNMAP_NEEDLE_FAILED;
TRACE("main end");
return 0;
}

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