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author | The Android Open Source Project <initial-contribution@android.com> | 2008-10-21 07:00:00 -0700 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2008-10-21 07:00:00 -0700 |
commit | 4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53 (patch) | |
tree | 54fd1b2695a591d2306d41264df67c53077b752c /toolbox/cmp.c | |
download | system_core-4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53.zip system_core-4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53.tar.gz system_core-4f6e8d7a00cbeda1e70cc15be9c4af1018bdad53.tar.bz2 |
Initial Contribution
Diffstat (limited to 'toolbox/cmp.c')
-rw-r--r-- | toolbox/cmp.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/toolbox/cmp.c b/toolbox/cmp.c new file mode 100644 index 0000000..9bd2e19 --- /dev/null +++ b/toolbox/cmp.c @@ -0,0 +1,90 @@ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <stdint.h> +#include <fcntl.h> +#include <sys/ioctl.h> +#include <errno.h> + +int cmp_main(int argc, char *argv[]) +{ + int c; + int fd1, fd2; + char buf1[4096], buf2[4096]; + int res, res1, res2; + int rv = 0; + int i; + int filepos = 0; + + int show_byte = 0; + int show_all = 0; + int limit = 0; + + do { + c = getopt(argc, argv, "bln:"); + if (c == EOF) + break; + switch (c) { + case 'b': + show_byte = 1; + break; + case 'l': + show_all = 1; + break; + case 'n': + limit = atoi(optarg); + break; + case '?': + fprintf(stderr, "%s: invalid option -%c\n", + argv[0], optopt); + exit(1); + } + } while (1); + + if (optind + 2 != argc) { + fprintf(stderr, "Usage: %s [-b] [-l] [-n count] file1 file2\n", argv[0]); + exit(1); + } + + fd1 = open(argv[optind], O_RDONLY); + if(fd1 < 0) { + fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno)); + return 1; + } + + fd2 = open(argv[optind+1], O_RDONLY); + if(fd2 < 0) { + fprintf(stderr, "could not open %s, %s\n", argv[optind+1], strerror(errno)); + return 1; + } + + while(1) { + res1 = read(fd1, &buf1, sizeof(buf1)); + res2 = read(fd2, &buf2, sizeof(buf2)); + res = res1 < res2 ? res1 : res2; + if(res1 == 0 && res2 == 0) { + return rv; + } + for(i = 0; i < res; i++) { + if(buf1[i] != buf2[i]) { + printf("%s %s differ byte %d", argv[optind], argv[optind+1], filepos + i); + if(show_byte) + printf(" 0x%02x 0x%02x", buf1[i], buf2[i]); + printf("\n"); + if(!show_all) + return 1; + rv = 1; + } + if(limit) { + limit--; + if(limit == 0) + return rv; + } + } + if(res1 != res2 || res < 0) { + printf("%s on %s\n", res < 0 ? "Read error" : "EOF", res1 < res2 ? argv[optind] : argv[optind+1]); + return 1; + } + filepos += res; + } +} |